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Please write an abstract with title: Evaluating the Economic Impact of Using Curtailed Renewable Energy Sources for Green Hydrogen Production, and key words: Renewable energy sources, Costs, Wind energy, Sensitivity analysis, Hydrogen, Green products, Process control. Abstract: Renewable energy investments has led to problem like oversupply of energy due to unavailability of large-scale energy storage options and intermittent nature of renewable energy. The excess energy can be harnessed into more profitable means such as hydrogen. In this study, hydrogen production via alkaline water electrolyser (AWE) powered by curtailed renewable energy is evaluated based on hourly curtailment data for California renewable energy curtailment for the year 2020. Dynamic optimization is adopted to solve the mixed-integer linear programming (MILP) problem to maximize the profits. The results show that implementing 100% availability of solar curtailment in hydrogen production for California would result in the highest profit and would be the fastest to achieve payback. From sensitivity analysis it was observed that the technology costs were the most sensitive parameters and may reduce capital expenditures in the near future and generate more profit. Further, given large solar installation capacity, solar curtailment dominates wind curtailment, making the exploitation of curtailed wind alone unprofitable. Overall, the study provides an outlook from both operator’s and investor’s perspectives in which the curtailed energy could be effectively utilized and converted into profit rather than a waste.
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1,701
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Please write an abstract with title: Underwater Feature Comparison of a Fan-Wing, a Propeller and a Fixed-Wing, and key words: Propellers, Attitude control, Drag, Computational modeling, Computational fluid dynamics, Force, Velocity control. Abstract: Fan-wing thrusters are firstly used on the aircrafts, and then demonstrated underwater. Although the force generation on the underwater fan-wing thruster is demonstrated, the advantages of fan-wing over other propulsors have not been proved. In this paper, a UFT, a vertical placed propeller and a fixed-wing with a high lift to drag ratio is compared in the aspects of underwater propulsion performance. The aspects in study include vertical force, forward drag and efficiency defined. Computational fluid dynamics simulations are carried out in the conditions of different rotational speeds of the moving parts and different cruise velocities. Based on the simulation results, the characteristics of the propulsors are discussed. In the high cruise velocity conditions, the UFT can generate a significant higher vertical force with high efficiency and low forward drag. In the low cruise velocity condition, the propeller performance better on vertical force generation and efficiency. The fixed-wing is the most efficient in all the simulation conditions.
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1,702
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Please write an abstract with title: On the Construction of a Monitoring System for Third Language Teaching Process Under the Full Credit System, and key words: Process monitoring, Uncertainty, Education, Reflection, Internet, Total quality management, Sustainable development. Abstract: In the past two decades, third language education has become increasingly important in various universities in China. In the curriculum of many universities, it is no longer just a compulsory second foreign language course for foreign language majors, but also gradually becomes a university-wide elective course for other non-foreign language students. The question of how to guarantee the overall quality of third language teaching has become a question of reflection for every foreign language department and an important issue for the sustainable development of foreign language teaching in universities. This paper analyzes the difficulties of teaching process monitoring in the context of a full credit system, applies the PDCA model of a quality management system to the management of third language teaching, and adopts measures such as reasonable use of information platform, test and evaluation means, and focus on feedback from multiple subjects in the two key monitoring stages of instruction and implementation (D) and inspection and evaluation (C), to provide a kind of reference standard for monitoring the process of third language teaching in colleges and universities. The aim is to provide a reference standard for monitoring the process of third language teaching in universities.
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1,703
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Please write an abstract with title: Using Software-Defined Networking Technology for Delivering Software Updates to Wireless Sensor Networks, and key words: Wireless sensor networks, Education, Systems architecture, Computer architecture, Software, Security, Business. Abstract: The current paper proposes a system architecture where a distributed environment of wireless sensor networks (WSNs) can selectively receive software updates when enhanced with a Software-Defined Network (SDN) control environment. In the context of IoT, the current work aims to facilitate the deployment of software updates on WSNs in an automated fashion and also proposes the usage of this architecture in large scale business networks, where different areas of the same network may change their purpose at different times during the network lifecycle. A central component oversees the coordination of each WSN, but each WSN is responsible for retrieving its updates from the storage location. For security, the software updates are stored in a remote peer-2-peer storage location. A simulation environment is also presented which uses Mininet-Wifi as a WSN emulator with Pox controller as SDN enabler and uses the IPFS network as a remote peer-2-peer storage. The Pox controller’s host_tracker module is enhanced with features to retrieve the updates from the IPFS network and to deliver the retrieved information to each station on the network. The simulations show that information can be delivered with relatively small network overhead and changes to the Pox controller, making this a viable solution for delivering updates to WSNs.
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1,704
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Please write an abstract with title: Onward and Upward: Wilson Helping to Unite Women [Women to Watch], and key words: Engineering profession, STEM, Gender issues. Abstract: As a founding member of Uniting Professional Women Advancing Relationships and Development (UPWARD) Universities Networking with Intel for Tomorrow's Engineering & Sciences (U.N.I.T.E.S.) Women, a mentorship program for female science, technology, engineering, and math (STEM) students by Intel, UPWARD, and Santa Clara University, Dr. Sarah Kate Wilson (who goes by Katie) is a mentorship pro. This comes as no surprise, given that she has had some really great support throughout her career.
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1,705
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Please write an abstract with title: Asymptotic analysis of LMMSE multiuser receivers for multi-signature multicarrier CDMA in Rayleigh fading, and key words: Multiaccess communication, Rayleigh channels, Signal to noise ratio, Bit error rate, Multicarrier code division multiple access, Fading, RAKE receivers, H infinity control, Australia, Intersymbol interference. Abstract: This paper considers a multicarrier (MC) code-division multiple-access system where each user employs multiple signatures. The receiver is linear and minimizes the mean square error of the data estimate. Both multiple-user and single-user systems are considered, as well as single and multiple signatures per user. In each case, an asymptotic analysis is used to derive the output signal-to-interference-plus-noise ratio (SINR) as a function of the system loading, the noise power, and the fading properties of the channel. Asymptotic in this case means that the number of independent subcarriers and number of signatures per user each tends to infinity with fixed ratio. The associated bit-error rate (BER) is evaluated for binary phase-shift keying symbols. Simulations show that the asymptotic SINRs and BERs derived in each case are accurate for realistic finite systems.
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1,706
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Please write an abstract with title: Software technology for implementing reusable, distributed control systems, and key words: Software reusability, Distributed control, Control systems, Application software, Signal processing algorithms, Process control, Hardware, Distributed computing, Real time systems, Software systems. Abstract: A tutorial overview of software innovations for implementing, and facilitating the reuse of, complex control systems. The article focuses on distributed control with multiple processors.
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1,707
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Please write an abstract with title: Knowledge Link Inference of Graph Structure Based on Holographic Model, and key words: Semantics, Decoding, Dictionaries, Computational modeling, Knowledge based systems, Tensile stress, Convolution. Abstract: For current knowledge link inference methods, whether it is traditional translation models, semantic matching models, or convolutional neural network models, it is impossible to obtain rich semantic information. This paper mainly uses a pre-training layer based on the holographic model, and combines the knowledge structure to perform the knowledge link inference. Firstly, the pre-training layer is used as the model initialization. Secondly, the graph structure encoder layer not only combines the information of entities and relationships directly related to the current entity, but also considers the information including multi-hop neighbor nodes and auxiliary relationships. Finally, ConvKB is used as a decoder to score the triples. The model is evaluated on two benchmark datasets WN18RR and FB237, that is slightly better than the previous embedding models on some indicators.
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1,708
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Please write an abstract with title: Measurement and modeling of charge feedthrough in n-channel MOS analog switches, and key words: Current measurement, Charge measurement, Voltage, Switches, Capacitance, MOSFET circuits, Electrons, Computer simulation, MOS capacitors, CMOS technology. Abstract: Charge feedthrough in analog MOS switches has been measured. The dependence of the feedthrough voltage on the input and tub voltages, device dimensions, and load capacitances was characterized. Most importantly, it was observed that the feedthrough voltage decreases linearly with the input voltage. The significance of this observation when considering harmonic distortion in sample-and-hold circuits is discussed. A first-order computer simulation based on the quasi-static small-signal MOSFET capacitances shows good agreement with experimental results.
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1,709
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Please write an abstract with title: E-learning in Computer-Assisted Training, Advantages, Disadvantages and Future Trends, and key words: e-learning, information psychology, information didactics, educational software. Abstract: The present paper outlines e-learning from the perspective of the advantages and disadvantages of this education system. At the same time, the limitations of e-learning are presented. The study is carried out taking into account several aspects, including: the need for educational software in the world, in general, and in Romania, in particular; the types of existing educational software: websites, encyclopedias, e-books, etc.; the software market. In the end, there are some conclusions about e-learning.
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1,710
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Please write an abstract with title: Color texture recognition in video sequences using wavelet covariance features and support vector machines, and key words: Image texture analysis, Image sequence analysis, Covariance analysis, Image color analysis, Image segmentation, Feature extraction. Abstract: We pertain to the recognition of textural regions for color video analysis. The proposed scheme uses the covariance of 2/sup nd/-order statistics on the wavelet domain, between the different color channels of the video frames. These features, named as color wavelet covariance (CWC), are used as color textural descriptors. A support vector machine was chosen for the classification of the CWC feature vectors. Experiments were conducted using both animated Vistex texture mosaics and standard video clips. The estimated average accuracy ranged from 90% to 97%. The results show that the proposed methodology could efficiently be used in various multimedia applications as a complete supervised color texture recognition system.
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1,711
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Please write an abstract with title: Proposing Enterprise Architecture for Smart Regencies in Indonesia: A Perspective of Zachman Framework (ZF), and key words: Process modeling, Local government, Standards organizations, Standardization, Documentation, Planning, Stakeholders. Abstract: Enterprise Architecture (EA) has become a necessity for organizations to address their business, data, infrastructure, and information systems. EA deployment in the government sector (e-government) is seen crucial for enhancing the effectiveness of electronic-based service delivery. Unfortunately, there are some crucial challenges to the fundamental requirements of EA in the e-Government sector. There are still partially implemented, lack understanding of technological advances, lack of understanding architectural framework usability, does not have good documentation, and slow service. There is no certainty of normative standardization for operating procedures. Several studies have been conducted to solve these problems. However, its steps are not articulated systematically, nor are the requirements for designing an enterprise architecture for e-government described. This study aims to employ EA for Smart Regency, the unique characteristics of suburban areas in Indonesia. This research conducted Zachman Framework (ZF) as Enterprise Architecture Planning (EAP) methodology. This research has produced the Mapping of EA Model, EA List and Classification of Critical Success Factor, EA Model of Hierarchy Enabling factors, EA Value Chain, and EA Business Process Modeling from Smart Regency Development. This research contributes to exploring and selecting the appropriate e-Government EA framework for Smart Regency service architecture in Indonesia. It helps local government and stakeholders to attend to more crucial factors in developing Smart Regency EA.
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1,712
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Please write an abstract with title: High-band digital preprocessor (HBDP) for the AMRFC test-bed, and key words: Testing, Niobium, Radio frequency, Wideband, Narrowband, Array signal processing, Bandwidth, Spaceborne radar, Hardware, Apertures. Abstract: A fully integrated very wide-band (WB) digital receiver subsystem has been developed to support the Navy Advanced Multifunction RF Concept test-bed program. Input RF signals in the 6-18-GHz band are processed to provide digital outputs for narrow-band and digital beam outputs for WB applications having instantaneous bandwidths of 22 and 230 MHz, respectively. This paper describes the design and performance of the digital receiver subsystem.
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1,713
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Please write an abstract with title: Assessing Power Efficiency and Performance in Nanosatellite Onboard Computer for Control Applications, and key words: Benchmark testing, Power demand, Position measurement, Microprocessors, Software, Power measurement. Abstract: This article deals with the specification, realization, and testing of a novel benchmark to evaluate different microprocessors performance of nanosatellite onboard computers. Considering the current trend of nanosatellite in which reduced size, weight, and power consumption are in focus, the interest in solutions with a single onboard processor has increased posing new challenges for future applications. One of the major problems encountered in this context is how to analyze computer resources to meet onboard processing requirements of specific applications. Although a set of traditional benchmark programs already exists, the available set of instructions is not representative of some modern applications based on nanosatellites, such as attitude determination and control (ADC). In this context, the focus of this work is on benchmark assessment for ADC applications. A review of the main up to date control algorithms is presented to identify the main features to be explored in the proposed benchmark algorithm. The proposed benchmark is validated on three different low-cost microprocessors, commonly used not only in nanosatellite missions but also in hardware-in-the-loop ADC simulators, through performance analysis of output power consumption. The proposed solution contributes to increase the capacity of computer resource analysis and improve the current onboard computer selection guidelines.
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1,714
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Please write an abstract with title: Deception in A Multi-agent Adversarial Game: The Game of Guarding Several Territories, and key words: Games, Takagi-Sugeno model, Genetic algorithms, Generators, Axles, Automobiles, Approximation algorithms. Abstract: In this paper, a deceitful behaviour in an adversarial game is investigated. The simulation platform is the game of guarding several territories. In the game, an invader is playing in front of two defenders. A two-level policy system is proposed in this paper. The first level is called lower-level policy, which is the policy to invade or defend a particular territory. The second level is called higher level-policy, which decides about the invader's behaviour and defenders' belief. The invader tries deceiving the defenders by repeatedly changing its goal from a fake goal to the true goal. On the other side, the defenders try to guess the goal by the invader's movement. The lower-level policy is trained via the FACL algorithm, while the higher-level policy is derived via the genetic algorithm. The results show a significant improvement in the invader's pay-off by behaving deceitfully in the game.
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1,715
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Please write an abstract with title: Influence of Accounting Information on Financial Management Projects in Intelligent Information Environment based on Smart Data Mining, and key words: Industries, Costs, Finance, Benchmark testing, Solids, Data mining, Forecasting. Abstract: In the modern society of the information network era, financial management has gradually become the focus of attention in the development process of various enterprises. Strengthening the management of enterprise finance can effectively control the cost of operation and development of the enterprise, thus laying a solid foundation for the future development of the enterprise. economic basis. The functional modules of the system based on intelligent data mining correspond to intelligent cockpit, intelligent report, intelligent financial analysis report and intelligent interaction, intelligent benchmarking (industry benchmarking, historical benchmarking, budget benchmarking, state-owned enterprise benchmarking in the same province, etc.), Risk early warning and control and financial forecasting.
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1,716
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Please write an abstract with title: Achieving Multi-Beam Gain in Intelligent Reflecting Surface Assisted Wireless Energy Transfer, and key words: Array signal processing, Resource management, Wireless communication, Energy exchange, Vehicle dynamics, Upper bound, Optimized production technology. Abstract: Intelligent reflecting surface (IRS) is a promising technology to boost the efficiency of wireless energy transfer (WET) systems. However, for a multiuser WET system, simultaneous multi-beam energy transmission is generally required to achieve the maximum performance, which may not be implemented by using the IRS having only a single set of coefficients. As a result, it remains unknown how to exploit the IRS to approach such a performance upper bound. To answer this question, we aim to maximize the total harvested energy of a multiuser WET system subject to the user fairness constraints and the non-linear energy harvesting model. We first consider the static IRS beamforming scheme, which shows that the optimal IRS reflection matrix obtained by applying semidefinite relaxation is indeed of high rank in general as the number of energy receivers (ERs) increases, due to which the resulting rank-one solution by applying Gaussian Randomization may lead to significant loss. To achieve the multi-beam gain, we then propose a general time-division based novel framework by exploiting the IRS's dynamic passive beamforming. Moreover, it is able to achieve a good balance between the system performance and complexity by controlling the number of IRS shift patterns. Finally, we also propose a time-division multiple access (TDMA) based passive beamforming design for performance comparison. Simulation results demonstrate the necessity of multi-beam transmission and the superiority of the proposed dynamic IRS beamforming scheme over existing schemes.
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1,717
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Please write an abstract with title: Design and Experimentation of a Novel Five Coil Asymmetric Magnetic Resonance Wireless Power Transfer System, and key words: Topology, Switches, Mathematical model, Magnetic resonance, Inductance, Cellular phones, Wireless power transfer. Abstract: This paper introduces a wireless power transfer system using a 5-coil asymmetric topology to mitigate range limitations when powering devices requiring small coils. The efficiency of a traditionally coupled wireless power transfer system falls sharply at distances beyond the diameter of the coils used. In order to power devices requiring small packaging at a distance, this limitation must be eliminated. Magnetically coupled coils have demonstrated the ability to extend power transfer distances beyond that of traditional coupling techniques; however, power transfer is still limited by coil size. We utilized the power transfer capabilities demonstrated by a 4-coil magnetic resonant transfer system and introduced a fifth coil to extend the transfer range. Coil asymmetry was then introduced to overcome coils radius limitations. This power transfer technique was demonstrated by charging a cell phone at a distance of 61 cm. The 5-coil transfer system operates at 40% efficiency from amplifier output to rectifier input. We develop an end-to-end power transfer system including a power amplifying source, 5-coil transfer system, and load including rectification to feed the cell phone. Circuit models and equations are introduced for all three stages with an emphasis on the asymmetric 5-coil system. Key parameters characterizing the 5-coil wireless transmission segment are also derived. Individual and system-wide efficiency limitations are discussed, and areas of future work are presented.
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1,718
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Please write an abstract with title: Review of Methods for Determining Parameters of Synchronous Generators Computational Model, and key words: Training, Adaptation models, Computational modeling, Current measurement, Power system stability, Synchronous generators, Data models. Abstract: A synchronous generator has a significant impact on the stability and reliability of consumers' power supply. At present, the problems of emergency and operational control of power systems are being solved on the basis of computational models. The parameters of such models are determined using reference data or test data. The parameters of generator models are highly dependent on external factors. The presence of this dependence leads to a significant decrease in the accuracy of solving the problems of power system control. Currently, identification based on traditional telemetry systems or synchrophasor measurements is used to improve the accuracy of the power systems computational models parameters. This research aims to analyze the studies, the authors of which have developed methods for determining the parameters of a synchronous generator based on measurement data. In the research, both Russian and foreign works are analyzed and grouped. For each group, the advantages, disadvantages, as well as the area of application were identified. It was concluded that the existing methods for determining the parameters of synchronous generators from the measurement data are not able to change in accordance with the set of initial data. In addition, the research has shown that these methods require significant computing power. The adaptive model of a synchronous machine is proposed as a way to overcome these disadvantages.
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1,719
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Please write an abstract with title: A unified perspective on ARTM tier I waveforms - part II: common detectors, and key words: Detectors, Bit error rate, Frequency modulation, Matched filters, Telemetry, Pulse modulation, Maximum likelihood detection, Bandwidth, Modulation coding, Phase change materials. Abstract: In the part I companion paper we showed that the tier 1 waveforms FQPSK-JR and SOQPSK-TG - can both be viewed as either an XTCQM or a CPM (although the CPM representation of FQPSK-JR is only an approximation). In this paper we examine the performance of three architectures for a common detector: a symbol-by-symbol detector, an XTCQM detector, and a CPM detector. The symbol-by-symbol detector suffers a 2.0 dB loss relative to the optimum detector for SOQPSK-TG and a 2.2 dB loss for FQPSK-JR when an integrate and dump filter is used and a 1.5 dB loss for SOQPSK-TG and a 1.6 dB loss for FQPSK-JR when a detection filter matched to the average waveform is used. The common XTCQM detector gives a bit error rate performance that is 0.1 dB worse than optimum for SOQPSK-TG and approximately equal to optimum for FQPSK-JR. The common CPM detector gives a bit error rate performance that is 0.25 dB worse than optimum for SOQPSK-TG and about 0.05 dB worse than optimum for FQPSK-JR. The common XTCQM detector provides the best overall performance among the candidate common detectors, but this detector has the highest complexity of the three
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1,720
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Please write an abstract with title: Bayesian Optimization for auto-tuning GPU kernels, and key words: Tuners, Convolution, Scalability, Computational modeling, Graphics processing units, Search problems, Bayes methods. Abstract: Finding optimal parameter configurations for tunable GPU kernels is a non-trivial exercise for large search spaces, even when automated. This poses an optimization task on a nonconvex search space, using an expensive to evaluate function with unknown derivative. These characteristics make a good candidate for Bayesian Optimization, which has not been applied to this problem before. However, the application of Bayesian Optimization to this problem is challenging. We demonstrate how to deal with the rough, discrete, constrained search spaces, containing invalid configurations. We introduce a novel contextual variance exploration factor, as well as new acquisition functions with improved scalability, combined with an informed acquisition function selection mechanism. By comparing the performance of our Bayesian Optimization implementation on various test cases to the existing search strategies in Kernel Tuner, as well as other Bayesian Optimization implementations, we demonstrate that our search strategies generalize well and consistently outperform other search strategies by a wide margin.
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1,721
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Please write an abstract with title: Influence of glycerol on the mechanical reversibility and thermal damage susceptibility of collagenous tissues, and key words: Optical scattering, Biomedical optical imaging, Optical refraction, Optical variables control, Skin, Mechanical factors, Bovine, Protection, Thermal stability, Biomembranes. Abstract: Clinical procedures wherein supraphysiologic temperatures must be achieved in deep layers of tissue via light are often compromised by optical scattering and absorption. Optical clearing of tissue superficial to the target improves the efficacy of such procedures. Glycerol is an attractive chemical agent for achieving dramatic reductions in tissue turbidity, but its net effects on healthy tissue are not fully understood. In this paper, we investigate possible alterations of biaxial mechanical properties in a model collagenous tissue, bovine epicardium, induced by glycerol. Furthermore, we examine the effects of glycerol on the biaxial thermomechanical properties of epicardium constrained at near-physiologic length. It is seen that mechanical changes induced by glycerol are fully reversed upon rehydration in normal saline. Moreover, glycerol protects cleared tissue by increasing its thermal stability and minimizing thermal alterations of mechanical properties.
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1,722
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Please write an abstract with title: A generalized least squares handover algorithm for wireless systems, and key words: Least squares methods, Least squares approximation, Hysteresis, Degradation, Performance loss, Base stations, Parameter estimation, Wireless communication, Knee, Land mobile radio. Abstract: An adaptive handover algorithm for wireless communications systems is proposed in this paper. The algorithm makes use, among others, of the least squares estimate of path loss parameters and is presented as a generalized version (G-ELS) of the ELS (extended least squares) algorithm. The relevant novelty of the proposed algorithm consists of detecting sudden variations of path loss parameters (a knee in line-of-sight and the street corner effect) in microcellular environments by re-initializing the estimate. A simple hysteresis adaptation rule is also included. It is seen that the G-ELS algorithm yields good performance in the microcellular environment, without determining performance losses with respect to the ELS in macrocellular environments. Furthermore, it may still yield better performance than the classical AVG (averaging) algorithm.
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1,723
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Please write an abstract with title: Prediction of Large-Scale Wildfires With the Canopy Stress Index Derived from Soil Moisture Active Passive, and key words: Fires, Moisture, Soil moisture, Soil, Vegetation mapping, Forestry, Surface soil. Abstract: Land surface variables such as surface soil moisture are recognized as important wildfire indicators. However, quantifying wildfire fuel combustibility through only satellite-retrieved soil moisture remains challenging, because soil moisture does not provide information about vegetation (fuel) moisture and water availability to plants is complicated by another factor of soil properties. Thus, to enhance the wildfire prediction ability of the soil moisture active passive (SMAP) mission, this study examines a canopy stress index (CSI) retrieved from 1 km SMAP level 2 products. The strong relationship between prefire CSI and fire severity is demonstrated over two large-scale (greater than 1000 ha) wildfires in Gang-won Province, South Korea. CSI can effectively predict the severity of large-scale wildfires one week before fire events, differentiating dry soils from wildfire hazards. SMAP L2 data with a temporal resolution of 5–7 d over the study sites are suitable for supporting aerial firefighting activities and reducing false fire warnings.
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1,724
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Please write an abstract with title: Precise Navigation for High Resolution Geophysics in Hudson Bay, and key words: Global Positioning System, Satellite broadcasting, Orbits, Frequency, Earth, Marine vehicles, Satellite ground stations, Monitoring, Manufacturing, Sonar. Abstract: Historically, the vast majority of high resolution geophysics surveys carried out in Canada and in most parts of the world have used various types of radio navigation aids, often in combination with satellite systems, to provide accurate position control for the seismic vessel and its associated sensors. Hudson Bay poses a unique problem in that it is one of the great oceans of the world but does not have any permanent navaids providing navigation control for the passage of ships. The difficult and relatively restricted access to the shoreline would make the establishment of a temporary radio navigation system not only logistically difficult but cost prohibitive. This paper briefly presents the theory of operation for each of the systems used, provides an operational summary of the data collection methods, describes the post processing of the integrated data set and addresses the accuracy considerations of the system as used in Hudson Bay.
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1,725
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Please write an abstract with title: Hybrid photonic integration for multifunctional laser systems on a chip-scale platform, and key words: Industries, Beam steering, Power lasers, Hybrid power systems, Diode lasers, System-on-chip, Laser beams. Abstract: We discuss our recent work in hybrid integration of III/V and Si3N4 PICs and demonstrate diode laser wavelength tuning and linewidth reduction, beam steering with multiple sources, coherent beam combining, and wavelength beam combining.
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1,726
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Please write an abstract with title: A Representation-Focused Training Algorithm for Deep Networks, and key words: Training, Deep learning, Conferences, Neural networks, Data science, Prediction algorithms, Minimization. Abstract: We present an optimization algorithm for the training of deep networks that focuses the optimization on the parameters of the feature representation while eliminating the optimization on the parameters of the prediction map. The proposed algorithm can be analyzed for least-squares objectives for which the implicit minimization can be obtained analytically on mini batches. We illustrate the numerical performance of the optimization algorithm with convolutional networks and explore a variant using Adam as a wrapper algorithm.
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1,727
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Please write an abstract with title: Understanding the Design-Space of Sparse/Dense Multiphase GNN dataflows on Spatial Accelerators, and key words: Distributed processing, Costs, Sensitivity, Taxonomy, Load management, Spatial databases, Hardware. Abstract: Graph Neural Networks (GNNs) have garnered a lot of recent interest because of their success in learning representations from graph-structured data across several critical applications in cloud and HPC. Owing to their unique compute and memory characteristics that come from an interplay between dense and sparse phases of computations, the emergence of recon-figurable dataflow (aka spatial) accelerators offers promise for acceleration by mapping optimized dataflows (i.e., computation order and parallelism) for both phases. The goal of this work is to characterize and understand the design-space of dataflow choices for running GNNs on spatial accelerators in order for mappers or design-space exploration tools to optimize the dataflow based on the workload. Specifically, we propose a taxonomy to describe all possible choices for mapping the dense and sparse phases of GNN inference, spatially and temporally over a spatial accelerator, capturing both the intra-phase dataflow and the inter-phase (pipelined) dataflow. Using this taxonomy, we do deep-dives into the cost and benefits of several dataflows and perform case studies on implications of hardware parameters for dataflows and value of flexibility to support pipelined execution.
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1,728
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Please write an abstract with title: Fractional Dynamical Analysis of One Dimensional Electrical Transmission Line, and key words: Power transmission lines, Spirals, Solitons, Switches, Power system stability, Telephone sets, Solids. Abstract: Soliton solution and fractional derivative in the electrical transmission line have an extended impact on transmission line stability. This article explains and illustrates the use of a set of coupled dynamical equations, the second-order of the model of one dimension electrical transmission lines. It is focused on the ansatz-function method for determining explicit traveling solitary wave solutions to non-linear evolution equations of the one-dimensional transmission line. Simultaneously with the comparative study of integer derivative(local) with its fractional(nonlocal) dynamical analysis and the soliton solution. In the illustration of the bifurcation plot of the one-dimensional electrical transmission line, it is observed that the system state node in the local case turns to a Long-lasting spiral stable state node in the fractional dynamical state. It is a remarkable output of the effort.
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1,729
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Please write an abstract with title: Asymptotical stability in discrete-time neural networks, and key words: Asymptotic stability, Intelligent networks, Neural networks, Chaos, Sufficient conditions, Lyapunov method, Artificial neural networks, Convergence, Symmetric matrices, Mathematics. Abstract: In this work, we present a proof of the existence of a fixed point and a generalized sufficient condition that guarantees the stability of it in discrete-time neural networks by using the Lyapunov function method. We also show that for both symmetric and asymmetric connections, the unique attractor is a fixed point when several conditions are satisfied. This is an extended result of Chen and Aihara (see Physica D, vol. 104, no. 3/4, p. 286-325, 1997). In particular, we further study the stability of equilibrium in discrete-time neural networks with the connection weight matrix in form of an interval matrix. Finally, several examples are shown to illustrate and reinforce our theory.
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1,730
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Please write an abstract with title: Phase Retrieval for Partially Coherent Observations, and key words: Antenna measurements, Inverse problems, Phase measurement, Image reconstruction, Optical variables measurement, Noise measurement, Task analysis. Abstract: Phase retrieval is in general a non-convex and non-linear task and the corresponding algorithms struggle with the issue of local minima. We consider the case where the measurement samples within typically very small and disconnected subsets are coherently linked to each other - which is a reasonable assumption for our objective of antenna measurements. Two classes of measurement setups are discussed which can provide this kind of extra information: multi-probe systems and holographic measurements with multiple reference signals. We propose several formulations of the corresponding phase retrieval problem. The simplest of these formulations poses a linear system of equations similar to an eigenvalue problem where a unique non-trivial null-space vector needs to be found. Accurate phase reconstruction for partially coherent observations is, thus, possible by a reliable solution process and with judgment of the solution quality. Under ideal, noise-free conditions, the required sampling density is less than two times the number of unknowns. Noise and other observation errors increase this value slightly. Simulations for Gaussian random matrices and for antenna measurement scenarios demonstrate that reliable phase reconstruction is possible with the presented approach.
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1,731
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Please write an abstract with title: On the Wiener and Hammerstein models for power amplifier predistortion, and key words: Power amplifiers, Predistortion, Neural networks, Modulation, Polynomials, Power system modeling, Signal processing, Adaptive algorithm, Communication equipment, Communication standards. Abstract: This paper presents a comparative study on the suitability of using Hammerstein or Wiener models to identify the power amplifier (PA) nonlinear behavior considering memory effects. This comparative takes into account the operational complexity regarding the identification process as well as their accuracy to follow the PA behavior. Both identified PA models will be used to estimate a Hammerstein based predistorter in order to see which model combination provides better linearization results. In addition, two adaptive algorithms for predistorting both PA models are compared in terms of accuracy and converge speed.
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1,732
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Please write an abstract with title: Multitemporal evaluation of topographic normalization methods on deciduous forest TM data, and key words: Remote sensing, Pixel, Photometry, Satellites, Reflection, Bidirectional control, Sun, Surface topography, Vegetation mapping, Reflectivity. Abstract: Five empirical and nonempirical parametric topographic normalization methods (the cosine, SCS, Minnaert, b correction, and c correction methods) were applied to multitemporal Landsat Thematic Mapper data (bands 1-5 and 7) collected in different periods of the growing season (April, June, and July) of a mixed deciduous forest area (340 ha) in the northern Apennines. The effectiveness of the models at removing topographic control, preserving internal data variability, and consistently normalizing radiance for flat pixels from band to band and image to image was evaluated. The entirely empirical b correction outperformed the other considered methods without relying on any photometric function.
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1,733
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Please write an abstract with title: On segmented channel routability, and key words: Routing, Equations, Switches, Field programmable gate arrays, Input variables, Fabrics, Transforms, Integer linear programming. Abstract: We address the problem of checking the routability of segmented channels using satisfiability. The segmented channel routing problem arises in the context of row-based field programmable gate arrays (FPGAs). Our approach transforms the routing task into a single large Boolean equation such that any assignment of input variables that satisfies the equation specifies a valid routing. It considers all nets simultaneously and the absence of a satisfying assignment implies that the channel is unroutable. Empirical results show that the method is time-efficient and applicable to large problem instances.
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1,734
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Please write an abstract with title: Linearization of GaN HEMT-Based Power Amplifiers Using a Bias Tracking Digital Predistortion, and key words: Wireless communication, Pulse measurements, Nonlinear distortion, HEMTs, Logic gates, Predistortion. Abstract: In this paper, a novel bias tracking (BT) digital predistortion (DPD) scheme for the compensation of charge-trapping effects in GaN HEMT -based power amplifiers (PAs). In the BT DPD scheme, a piece-wise polynomial (PMP) model is proposed in the digital domain to model the compensation bias voltage that is injected into the P A's gate bias and mask the gain changes caused by long-term charge-trapping effects. The proposed BT compensation method was demonstrated with a series of pulse-modulated LTE signals on a class-AB GaN HEMT-based P A. Measurement results indicated the proposed BT DPD scheme outperformed the conventional DPD method in linearization performances.
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1,735
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Please write an abstract with title: Vulnerability assessment system (VAS), and key words: Information security, National security, Communication industry, Software packages, Information management, Computer security, IP networks, Protection, Network servers, Computerized monitoring. Abstract: Institute for Information Industry is currently handling a project for National Information and Communication Security Taskforce of Executive Yuan. One of the missions of this project is to conduct information security assessments for the current security situation of the national network. Although there are already many commercial software packages on the market to help diagnose security vulnerabilities, but most of these software packages are aiming for small to medium size organizations and only for one single enterprise infrastructure. Therefore, they are not able to perform an over-organization, integrated vulnerability assessment analysis. Moreover, the vulnerability assessment is only the beginning step of solving information security problems; there is a need for a comprehensive management mechanism for information security vulnerability assessment, to let IT staff precisely resolve the security problems of the information systems. As the result, the design goal of VAS is to provide assistance to perform a comprehensive management mechanism for information security vulnerability assessment.
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1,736
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Please write an abstract with title: IPv6-based dynamic coordinated call admission control mechanism over integrated wireless networks, and key words: Call admission control, Wireless networks, Bandwidth, Wireless LAN, Bluetooth, Quality of service, Admission control, Packet radio networks, GSM, IP networks. Abstract: Many wireless access systems have been developed recently to support users mobility and ubiquitous communication. Nevertheless, these systems always work independently and cannot simultaneously serve users properly. In this paper, we aim to integrate IPv6-based wireless access systems and propose a coordinated call admission control mechanism to utilize the total bandwidth of these systems to minimize the call blocking probabilities, especially the handoff call dropping probabilities. First, we propose an integrated hierarchical wireless architecture over IPv6-based networks to combine the wireless access systems including cellular systems (second-generation, General Packet Radio Service, or third-generation), IEEE 802.11 a/b/g WLAN, and Bluetooth. In the proposed architecture, mobile user can request a call with quality-of-service (QoS) requirements by any wireless network interfaces that can be accessed. When the proposed coordinated call admission control (CCAC) mechanism receives a request, it takes the QoS requirements of the incoming call and the available and reserved bandwidth of this wireless system into consideration to accept or reject this request. Besides, the mechanism can coordinate with other wireless systems dynamically to adjust the bandwidth reserved for handoff calls at each wireless system in this architecture so as to reduce the call blocking probabilities. Once the call is admitted, the mobile user is able to access heterogeneous wireless access networks via multiple interfaces simultaneously. Finally, we evaluate this system to show that the CCAC on the proposed architecture outperforms other mechanisms proposed before.
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1,737
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Please write an abstract with title: A model of quantifying social relationships, and key words: social networks, network dynamics, social dynamics, network structure, classification, quantifying social ties, attribute similarity, attribute dissimilarity. Abstract: This article proposes a mathematical model for quantifying relationships between agents within a network based on their similarity, dissimilarity, level of friendship, group and activity status of the agent. We propose a set of functions to facilitate quantifying social dynamics. Our functions cover the comparison of an agent with group and comparing a group with groups based on their set of attributes. We also propose a model of comparison for agent vs. agent based on their attributes, features and the likelihood of attribute similarity between agents. The model employs a method of determining connection probabilities between nodes in order to find hidden connections between agents. We build on existing work in the study of social networks.
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1,738
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Please write an abstract with title: Blind Calibration for Sparse Regression: A State Evolution Analysis, and key words: Calibration, Message passing, Approximation algorithms, Covariance matrices, Sensors, Gain measurement, Distortion measurement. Abstract: Sparse regression, such as the one used in compressed sensing, allows to acquire compressible signals with a small number of measurements. As such, a correct calibration of a potential hardware problem is a central issue. Blind calibration, that is performing at the same time calibration and compressed sensing when the training signals are sparse but unknown, is thus particularly appealing. A potential approach was suggested by Schülke et al, using an approximate message passing (AMP) for blind calibration (cal-AMP). Here, we show that the asymptotic performances of this algorithm can be analysed by an exact state evolution equation. It allows to confirm that cal-AMP requires a smaller number of measurements and/or signals in order to perform with respect to standard convex approaches, and opens the way to more complex message passing techniques.
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1,739
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Please write an abstract with title: Broadband Waveguide Filters with Wide Using a Stepped-Wall Evanescent Mode Approach, and key words: Band pass filters, Bandwidth, Iris, Pins, Inductance, Passband, Frequency, Power harmonic filters, Waveguide junctions, Microwave filters. Abstract: Utilizing more than one below cut-off cross section, evanescent mode series coupled bandpass filters are described which achieve wide passbands and stopbands with practical mechanical dimensions. Performance is comparable to the conventional approach. The new design is applicable for center frequencies to above 40 GHz.
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1,740
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Please write an abstract with title: A critical path selection method for delay testing, and key words: Circuit testing, Circuit faults, Timing, Integrated circuit interconnections, Benchmark testing, Delay effects, Manufacturing, Power supplies. Abstract: An approach for selecting critical paths along which testable path delay faults can exist is presented. The proposed method is particularly helpful on path intensive circuits. Critical paths are selected implicitly with the aid of a combination of decision diagrams. An implicit method to eliminate untestable faults along the selected paths is also presented. The effectiveness of the approach is demonstrated on path intensive ISCAS'85, ISCAS'89 and ITC'99 benchmarks.
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1,741
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Please write an abstract with title: Demonstration of a chaotic optical message relay using DFB laser diodes, and key words: Chaotic communication, Relays, Diode lasers, Optical receivers, Laser feedback, Optical transmitters, Vertical cavity surface emitting lasers, Distributed feedback devices, Surface emitting lasers, Optical feedback. Abstract: The demonstration of chaotic message relay using three chaotic distributed feedback diode lasers is reported. A 1-GHz message has been encoded in a chaotic carrier and relayed to a terminal receiver laser via a mediator laser. The message has been successfully extracted at both the mediator and receiver lasers. The message relay capability thereby demonstrated provides a key functionality for chaotic optical communication networks.
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1,742
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Please write an abstract with title: Turkish Profanity Detection Enhanced by Artificial Intelligence, and key words: Conferences, Toxicology, Standards, Internet, Computational modeling, Cleaning. Abstract: In this work, a hybrid artificial intelligence approach to classify a text as clean or profane is proposed. Focus of the proposed approach is to filter profane text shared by people who abuse the anonymous nature of the internet. Independent of any platform, proposed approach only requires a piece of text to work. In the first step, input text gets pre-processed by an iterative cleaning algorithm. Then, processed text is sent to a heuristic or artificial intelligence based approach depending on the word count. Artificial intelligence based approach uses three unique models to process text. Each model independently calculates profanity probability. For the last step, calculations are sent to a judge model to oversee the classification. Finally, either heuristic or artificial intelligence based approach generates a binary response for classification. It is presumed that the proposed approach will be beneficial for Turkish profanity detection on internet platforms.
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1,743
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Please write an abstract with title: Magnetic field amplification in accretion discs around the first stars: implications for the primordial IMF, and key words: MHD, turbulence, stars: formation, stars: Population III, ISM: magnetic fields, early Universe. Abstract: Magnetic fields play an important role in the dynamics of present-day molecular clouds. Recent work has shown that magnetic fields are equally important for primordial clouds, which form the first stars in the Universe. While the primordial magnetic field strength on cosmic scales is largely unconstrained, theoretical models strongly suggest that a weak seed field existed in the early Universe. We study how the amplification of such a weak field can influence the evolution of accretion discs around first stars, and thus affect the primordial initial mass function (IMF). We perform a suite of 3D ideal magneto-hydrodynamic simulations with different initial field strengths and numerical resolutions. We find that, in simulations with sufficient spatial resolution to resolve the Jeans scale during the collapse, even initially weak magnetic fields grow exponentially to become dynamically important due to both the so-called small-scale turbulent dynamo and the large-scale mean-field dynamo. Capturing the small-scale dynamo action depends primarily on how well we resolve the Jeans length, while capturing the large-scale dynamo depends on the Jeans resolution as well as the maximum absolute resolution. Provided enough resolution, we find that fragmentation does not depend strongly on the initial field strength, because even weak fields grow to become strong. However, fragmentation in runs with magnetic fields differs significantly from those without magnetic fields. We conclude that the development of dynamically strong magnetic fields during the formation of the first stars is likely inevitable, and that these fields had a significant impact on the primordial IMF.
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1,744
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Please write an abstract with title: Co-Regularized Discriminative Spectral Clustering With Adaptive Similarity Measure in Dual-Kernel Space, and key words: Kernel, Laplace equations, Clustering algorithms, Extraterrestrial measurements, Manifolds, Clustering methods, Robustness. Abstract: Spectral clustering is a very popular graph-based clustering technique that partitions data groups based on the input data similarity matrix. Many past studies based on spectral clustering, however, do not consider the global discriminative structure of the dataset. Also, the benefits of using more than one kernel have not been fully exploited with respect to spectral clustering, although it has been established by these past studies that using more than one kernel in clustering can result in a more accurate clustering than those obtained with a single kernel. Multi-kernel approaches, however, tend to be more time consuming compared to single kernel methods. To compensate these drawbacks, we integrate a global discriminative term into the clustering with an adaptive neighbor framework. This is done to preserve both the global geometric information and global discriminative information in a dual kernel space, in an attempt to optimize clustering performance. Via co-regularization, we utilize more than one kernel space to take advantage of the benefits of multiple kernels. We, however, use two heterogeneous kernels to help us reduce clustering time, since the ability to quickly process data is as equally important as its accuracy in this era of information explosion. Since these different kernel spaces admit the same underlying clustering of the data, we approach the problem looking for clustering consistent across the two kernel views. Hence we are able to detect the non-linear intrinsic geometrical information of the dataset. We perform clustering using the obtained indicator matrix from our modified Laplacian utilizing k-means. Our Experimental outcomes show that our approach gives satisfactory results in terms of accuracy and NMI, with time-to-cluster savings in comparison to other state-of-the-art clustering methods using both synthetic and public datasets.
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1,745
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Please write an abstract with title: Artificial Signals and Identification Methods to Evaluate the Quality of Speech Coders, and key words: Signal processing, Speech analysis, Distortion measurement, Testing, Economic forecasting, Particle measurements, Algorithm design and analysis, Laboratories, Codecs, Filtering algorithms. Abstract: Objective quality measures provide an economic and practical alternative to tedious and expensive subjective tests. Furthermore, some recently proposed measures predict quality values which correlate quite well with the subjective ones. The objective measures are particularly useful to test the influence of design parameters during the laboratory development of codec algorithms. In this paper the architecture of a measuring equipment to conduct objective quality measures on speech waveform coders is presented and discussed. Only the input and output signals from the coder are needed and an identification algorithm is used to separate the distortion effects introduced by the coder from other effects such as gains, time shifts, low-pass filtering, and so on. The choice of the most appropriate kind of signal for the identification and measurement steps is a problem also investigated. Particularly, results concerning mathematically defined speech-like signals are reported. The performance of the method is investigated under different conditions and the correlations with subjectively determined results are also reported for a number of ADPCM coders with widely varying parameters.
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1,746
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Please write an abstract with title: Impact of concurrent transmissions on downstream throughput in multihop cellular networks, and key words: Throughput, Intelligent networks, Spread spectrum communication, Land mobile radio cellular systems, Concurrent computing, Relays, Interference, Network topology, Circuit topology, Contracts. Abstract: In this paper, we investigate the impacts of transmission concurrency on the throughput of the downstream channel in multihop cellular networks. In particular, this paper focuses on the tradeoff between the improvement of resource reuse and the increase in radio interference. We evaluate and compare the throughput for various concurrency types of multihop relaying. We also propose a hybrid control strategy, in which we advocate the use of both, the concurrent and the nonconcurrent transmissions. Our results show that the throughput can be increased by allowing transmission concurrency, but the concurrency does not always result in higher throughput, relative to the nonconcurrency case, because of the interference between concurrently transmitting links. In the random topology with shadowing, depending on the particular circumstances, either the concurrent or the nonconcurrent case can be the optimal transmission strategy. Thus, in order to achieve a significant improvement, a hybrid scheme should be employed. Additionally, if concurrency is applied, it should be used among the different downstream paths, rather than between the hops on the same downstream path.
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1,747
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Please write an abstract with title: A service management facility for the Java/spl trade/ platform, and key words: Java. Abstract: Managing operational and semantic inter dependencies among software services is a relatively unexplored topic, despite its relevance to automating service deployments and to increased availability. In this paper we describe a framework for structured and programmatic dependency management among services written in the Java/spl trade/ programming language. The framework's interface allows for defining an acyclic graph of dependencies. The graph's structure reflects the startup sequence of managed services. Upon a service failure or intentional termination, the dependencies are consulted to determine which services may be affected. If the dependencies so dictate, a service that has gone off-line will automatically be restarted. The requisite changes, e.g., restarting, will be propagated along the graph's edges to ensure that the required dependencies are satisfied for each service. We demonstrate the usefulness of this framework through real-life case studies.
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1,748
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Please write an abstract with title: Solving a Mathematical Model for Determining Parking Spaces in the City, and key words: transport plan, maximum flow, optimization task.. Abstract: This paper focuses primarily on parking in the town of Sozopol, where there are major parking problems. In this regard, the parking idea offers a framework for addressing parking issues as well as guidance for particular activities to address the parking issue. An appropriate optimization problem has been defined and solved in a model that has been built to design the transport plan. According to the outlined and resolved optimization challenges, the solutions thus acquired for the transport plan are the best.The allocation of major traffic flows is shown in this paper’s transportation plan. It determines parking places in the city of Sozopol while evaluating the transport plan’s existing capacity. Almost all vehicle trips finish with a parking spot. Parking management typically does not involve substantial investments, such as new roads or increased public transportation, and can therefore be implemented in a very short amount of time. Additionally, almost all major cities in Europe have some type of parking management. Because of this, parking management is far more popular with the general public than innovative approaches to controlling automobile use, including congestion pricing programs.
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1,749
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Please write an abstract with title: GECC-Net: Gene Expression-Based Cancer Classification using Hybrid Fuzzy Ranking Network with Multi-kernel SVM, and key words: Simulation, Transfer learning, Support vector machine classification, Feature extraction, Colon, Fourth Industrial Revolution, Gene expression. Abstract: Gene selection is recognized as the basic procedure in the bioinformatics sector. The present approaches relevant to cancer categorization are primarily clinical foundation, and its diagnostic skill is restricted. Nowadays, the fundamental challenges of cancer detection are handled by the usage of gene expression data. The researchers have been providing several options to detect cancer accurately and efficiently. This paper aims to develop the gene expression-based cancer classification network (GECC-Net) using artificial intelligence methods. Initially, transfer learning based AlexNet is used to extract the features from the dataset by analyzing the relationship between various entities. Then, hybrid fuzzy ranking network (HFRN) is used to select the optimal feature selection fuzzy rules. Further, multi kernel support vector machine (MK-SVM) is used to perform the multi class classification operation, which performs the ovarian, colon, lymphography cancers classification. The simulation results shows that the proposed GECC-Net resulted in superior performance in comparison with state-of-art approaches.
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1,750
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Please write an abstract with title: Statistical comparison of Denavit-Hartenberg based inverse kinematic solutions of the UR5 robotic manipulator, and key words: Solid modeling, Three-dimensional displays, Service robots, Statistical analysis, Quaternions, Kinematics, Tools. Abstract: Inverse kinematic control of industrial robotic manipulators is extensively used, for this reason it is important that inverse kinematic solutions are available for researchers working on this topic. This study presents the direct kinematic solution and four sets of equations to compute the inverse kinematics for the Universal Robots robotic arms, particularly the UR5, all of which were obtained by using the Denavit-Hartenberg methodology. The inverse kinematic solutions are compared through statistical methods by examining the position and orientation of the end effector. Results show that some sets of equations are better when evaluated with high precision tools.
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1,751
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Please write an abstract with title: Downlink transmission of broadband OFCDM systems-part III: turbo-coded, and key words: Downlink, OFDM, Turbo codes, Iterative decoding, Frequency, Code division multiplexing, Data communication, Wireless communication, Mobile communication, Interference cancellation. Abstract: Orthogonal frequency and code-division multiplexing (OFCDM) systems have been introduced for high-speed data transmission in future wireless mobile communications. In this paper, a hybrid multicode interference cancellation (MCI) and minimum mean-square error (MMSE) detection scheme is presented for the turbo-coded OFCDM systems. Channel estimation based on a code-multiplexed pilot channel is employed. The weights of the hybrid detection are derived theoretically and an effective method to generate the weights in practical applications is proposed. By means of computer simulation, the effects of system parameters on the performance are studied extensively. It is shown that the hybrid detection outperforms pure MMSE detection in various channel conditions, especially for high-level modulation schemes. To carry out interference regeneration for the hybrid detection, the conventional turbo decoding algorithm which only decodes systematic bits should be extended to decode parity bits as well. Moreover, two iterations in turbo decoding are sufficient to provide good performance for the system with the multistage hybrid detection. Finally, given time-domain spreading factor N/sub T/, the system performance improves with frequency-domain spreading factor N/sub F/. However, the frequency diversity gain is saturated when N/sub F/ is large (i.e., N/sub F//spl ges/16).
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1,752
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Please write an abstract with title: Power failures: why the power industry has public responsibilities to think outside the box, and key words: Power industry, Ethics, History, Power engineering and energy, Art, Energy consumption, Costs, Power generation, Encyclopedias. Abstract: Summary form only given. This paper argues that the power industry has public responsibilities not just to provide safe electricity at the lowest cost to consumers, but also to think critically about its own role in society and the environment. The argument takes place in three parts. 1) A brief social history of the development of the power industry. This is very schematic, but helps to provide a social and historical setting for other questions. 2) It considers the idea of public responsibility, and its role in engineering ethics in general. This is designed to provide a more philosophical context for the specific argument being made, and 3) it makes the argument itself, which can be summarized as follows: The power industry arose out of a particular vision of public responsibility. It has a proud history of meeting such responsibilities.
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1,753
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Please write an abstract with title: Lightweight Network Design Based on ResNet Structure for Modulation Recognition, and key words: Performance evaluation, Wireless communication, Vehicular and wireless technologies, Convolution, Computational modeling, Simulation, Neural networks. Abstract: The problem of unknown modulation signal recognition has been received intensely attentions in next-generational intelligent wireless communications. The deep learning (DL) has been widely used in unknown modulation signal recognition due to its excellent performance in solving classification problems and the DL-based automatic modulation classification (AMC) had been proposed. However, DL-based AMC method usually has high space complexity and computational complexity, which limits DL-based AMC to miniaturized devices with limited storage and computing capability. Therefore, a lightweight residual neural network (LResNet) for AMC is proposed in this paper. The simulation results show that the model parameters of LResNet is about 4.8% of the traditional CNN network, and about 14.9% of the ResNet and the classification performance of LResNet improves more than 3% compared with the traditional CNN network and decreases less than 1.5% compared to the ResNet.
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1,754
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Please write an abstract with title: On High-Density Resource-Restricted Pulse-Based IoT Networks, and key words: Receivers, Encoding, Internet of Things, Transmitters, Transceivers, Protocols, Hardware. Abstract: For the realization of an Internet of Things (IoT) with high densities of nodes it is necessary that wireless communication protocols are developed that offer (1) low energy consumption, (2) simplicity of encoding and decoding, (3) an asynchronous mode of communication, and (4) an effective but simple method to deal with interference between transmissions. This paper presents the implementation, experimentation, and analysis of a protocol on the MAC sublayer that is based on the encoding of information by the silent intervals between pulses. This encoding allows for few conflicts between messages that are broadcast on the same band overlapped in time. This is demonstrated experimentally, while no adverse effect is detected on transmissions from broadcasts of a different group of nodes using the same 315 MHz band but with a different code length as coding parameter. Theoretical analysis confirms that the probability of conflicts between messages is low, even if the number of nodes increases to the order of ten thousand. This protocol facilitates the implementation of IoT nodes that are restricted in terms of hardware and energy resources.
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1,755
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Please write an abstract with title: Solar Radio Observation Using CALLISTO at the USO/PRL, Udaipur, and key words: e-CALLISTO, LPDA, VSWR, Radiation Pattern. Abstract: This paper presents a detailed description of various subsystems of CALLISTO solar radio spectrograph installed at the USO/PRL. In the front-end system, a log periodic dipole antenna (LPDA) is designed for the frequency range of 40-900 MHz. In this paper LPDA design, its modifications, and simulation results are presented. We also present some initial observations taken by CALLISTO at Udaipur.
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1,756
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Please write an abstract with title: Analysis of Proportional-Integral-Derivative Controller for Doubly Fed Induction Generator Optimized using Ant Lion Optimization, and key words: Renewable energy sources, PI control, Doubly fed induction generators, Wind power generation, Open loop systems, Wind turbines, Reliability. Abstract: From the prospect of reducing the carbon footprint the non-conventional energy resources play an important role. The wind power is playing an important role in this regard with DFIG based wind turbines being widely used for renewable energy generation. This paper explains the analysis of a proportional integral derivative controller for doubly fed asynchronous generator connected to the grid optimized using Ant Lion optimization and the results supported using MATLAB/Simulation.
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1,757
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Please write an abstract with title: Discrete fractional Fourier transform based on new nearly tridiagonal commuting matrices, and key words: Fourier transforms, Discrete Fourier transforms, Neural networks, Kernel, Polynomials, Eigenvalues and eigenfunctions. Abstract: Based on discrete Hermite-Gaussian like functions, a discrete fractional Fourier transform (DFRFT) which provides sample approximations of the continuous fractional Fourier transform was defined and investigated recently. In this paper, we propose a new nearly tridiagonal matrix which commutes with the discrete Fourier transform (DFT) matrix. The eigenvectors of the new nearly tridiagonal matrix are shown to be better discrete Hermite-Gaussian like functions than those developed before. Furthermore, by appropriately combining two linearly independent matrices which both commute with the DFT matrix, we develop a method to obtain even better discrete Hermite-Gaussian like functions. Then, new versions of DFRFT produce their transform outputs more close to the samples of the continuous fractional Fourier transform, and their application is illustrated.
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1,758
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Please write an abstract with title: Emulation and Performance Evaluation of a Transparent Reordering Robust TCP Proxy, and key words: Receivers, Throughput, Emulation, Robustness, Load management, Linux, Delays. Abstract: The use of multiple paths in core networks for TCP traffic sounds promising as it suggests bandwidth aggregation, fault tolerance through redundancy, high resource utilization efficiency, reduced congestions, and increase in TCP throughput. In order to benefit from all these features, the load balancing approaches at different granularities (per-flow, per-destination, and per-packet) have to be applied. In order to promote use of per-packet load balancing in core networks, we already proposed a transparent TCP proxy called as ORTA (Out-of-Order Robustness for TCP with Transparent Acknowledgment Intervention). ORTA was introduced along with simulation results which were all promising and competing with the nontransparent approaches in the literature. However, network simulations may not reflect the real system performances because of the lack of precise and accurate model of the real systems. In this paper, ORTA is implemented as a netfilter module and emulation test results are presented. The results indicate that ORTA prevents TCP performance degradation caused by TCP packet reorderings. Moreover, ORTA has no degrading impact on TCP performance when packet reordering does not exist.
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1,759
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Please write an abstract with title: Handling High-Dimensional Data and Classification Using a Hybrid Feature Selection Approach, and key words: Computational modeling, Time series analysis, Redundancy, Focusing, Machine learning, Feature extraction, Time measurement. Abstract: Recently, we published a paper on feature selection and extraction technique on time series data classification: A Comparative analysis mainly focusing on classifiers, in this paper, we are implementing 10 classifiers on 3 open source datasets of UCI machine learning and measuring accuracy, precision, recall, and f1 score. On classifying using 10 classifiers over 3 open-source datasets results reveal that the confusion matrix attributes show the best results in the case of two classifiers, i.e. XGBoost and LightGBM. We proposed a hybrid approach by combining the filter class Minimum Redundancy and Maximum Relevance method and wrapper class Recursive Feature Elimination method with the above two classifiers. Results reveal that XGBoost and LightGBM Classifier outperforms the other classifiers in terms of confusion matrix attributes and the proposed hybrid model gives 95.28% accuracy with 13 feature by the lightgbm classifier and 93.4% accuracy by XGBoost classifier with 10 features on the ionosphere dataset.
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1,760
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Please write an abstract with title: A hybrid prefetch scheduling heuristic to minimize at run-time the reconfiguration overhead of dynamically reconfigurable hardware [multimedia applications], and key words: Prefetching, Dynamic scheduling, Runtime, Hardware, Processor scheduling, Tiles, Embedded system, Field programmable gate arrays, Computer architecture, Multimedia systems. Abstract: Due to the emergence of highly dynamic multimedia applications there is a need for flexible platforms and runtime scheduling support for embedded systems. Dynamic reconfigurable hardware (DRHW) is a promising candidate to provide this flexibility but, currently, not sufficient run-time scheduling support to deal with the run-time reconfigurations exists. Moreover, executing at run-time a complex scheduling heuristic to provide this support may generate an excessive run-time penalty. Hence, we have developed a hybrid design/run-time prefetch heuristic that schedules the reconfigurations at run-time, but carries out the scheduling computations at design-time by carefully identifying a set of near-optimal schedules that can be selected at run-time. This approach provides run-time flexibility with a negligible penalty.
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1,761
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Please write an abstract with title: On topology-independent IP group aggregation in multicast capable optical networks, and key words: Intelligent networks, Optical fiber networks, Telecommunication traffic, Multicast algorithms, Digital TV, Bit rate, Bandwidth, Traffic control, HDTV, Watches. Abstract: To support large-scale IP-TV signal delivering, a new multicast-IP over light-tree network model was proposed in W. Sun et al. In this paper, we study the problem of topology-independent IP group aggregation in the multicast capable optical network. We first use a tri-partite graph to describe the problem, and then formulate the problem by a mixed integer linear programming (MILP) model. Finally, we propose a pre-estimation for the number of light-trees to reduce the searching space, which significantly saves solving time of MILP
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1,762
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Please write an abstract with title: Passive Microwave Electric Field Display with Neon Light Bulb, and key words: Microwave antennas, Visualization, Neon, Codes, Microwave ovens, Electric fields, Microwave propagation. Abstract: To visualize the electric field distribution is of interest to High Power Microwave (HPM) research. Here we use a panel consists of 3600 6 mm diameter neon bulbs as a field display for a medium power 2.45 GHz source converted from a microwave oven. Commercial EM code with Multi-Level-Fast-Multipole-Method (MLFMM) algorithm is used to simulate the electric field distribution at a short distance. Such display can help decide which mode the microwave source is in.
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1,763
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Please write an abstract with title: A Survey on the Advancement of Travel Time Estimation Using Mobile Phone Network Data, and key words: Estimation, Sensors, Roads, Mobile handsets, Global Positioning System, Cellular networks, Handover. Abstract: The fast development of information and communication technologies has engendered a massive generation of mobile data with great potential for extracting mobility patterns and sensing urban dynamics. The data, itself, has unique characteristics depending on the technology and the network coverage design for different zones (urban-rural). Therefore, many research directions investigated the potential of such data to extract some important features of traffic information, such as travel time estimation, traffic flow, etc. From this perspective, our paper focuses on highlighting the advancements done during the last twenty years concerning the usage of mobile phone network data to estimate vehicles’ travel time in different geographical conditions. Furthermore, it discusses and covers the existing literature methods and the challenges they face due to the nature of the data, its quality, and its complexity. Finally, we reveal the main trends and directions for future work.
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1,764
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Please write an abstract with title: Re-projective vs. projective camera calibration: effects on 3D-reconstruction, and key words: Cameras, Calibration, Coordinate measuring machines, Image reconstruction, Prototypes, Computer errors, Application software, Computer vision, Optimization methods, Stereo vision. Abstract: The camera mapping can be seen in two ways. The classic approach is to emphasize the projective nature of the camera. But also every point in the image plane determines a viewing ray by its re-projection. Both mappings can be described by the same set of parameters. In fact the re-projective camera mapping can be seen as the inversion of the projective camera mapping. In this article we compare two error functions for a camera calibration. The projective error function measures the distance of the projected prototype to the observed points in the image plane. The re-projective error function measures the distance of the prototype to the reprojected rays which are determined by the observed points. We present calibration algorithms for both error functions and compare them with regard to the 3D-reconstruction problem.
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1,765
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Please write an abstract with title: Organizing a special-purpose computer to realize digital filters for sampled-data systems, and key words: Organizing, Digital filters, Control systems, Quantization, Roundoff errors, Accelerometers, Analog computers, Computational modeling, Circuit simulation, Computer simulation. Abstract: A special-purpose computer is organized to implement a programmable digital filter intended for use in sampled-data control systems. A canonical representation for the digital filter is selected and this form is implemented in functional blocks that are suitable for circuit integration. An analytical technique is discussed that helps determine acceptable quantization resolutions and round-off errors in the digital filter. Experimentation with the digital filter is performed in the pendulous integrating gyroscopic accelerometer control loop and in an analog computer simulation of the Saturn V thrust vector control system; the filter used as a digital compensator successfully stabilizes both sampled-data control systems. The performance of the digital filter is examined and organizational techniques to improve its characteristics are proposed.
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1,766
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Please write an abstract with title: Zero skew clock-tree optimization with buffer insertion/sizing and wire sizing, and key words: Clocks, Wire, Timing, Convergence, Routing, Delay effects, Algorithm design and analysis, Iterative algorithms, Very large scale integration, Polynomials. Abstract: Clock distribution is crucial for timing and design convergence in high-performance very large scale integration designs. Minimum-delay/power zero skew buffer insertion/sizing and wire-sizing problems have long been considered intractable. In this paper, we present ClockTune , a simultaneous buffer insertion/sizing and wire-sizing algorithm which guarantees zero skew and minimizes delay and power in polynomial time. Extensive experimental results show that our algorithm executes very efficiently. For example, ClockTune achieves 45/spl times/ delay improvement for buffering and sizing an industrial clock tree with 3101 sink nodes on a 1.2-GHz Pentium IV PC in 16 min, compared with the initial routing. Our algorithm can also be used to achieve useful clock skew to facilitate timing convergence and to incrementally adjust the clock tree for design convergence and explore delay-power tradeoffs during design cycles. ClockTune is available on the web (http://vlsi.ece.wisc.edu/Tools.htm).
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1,767
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Please write an abstract with title: Adaptive Sliding Mode Control based on SVR, and key words: Support vector machines, Adaptation models, Trajectory tracking, Robustness, Trajectory, Noise measurement, Sliding mode control. Abstract: Sliding mode control (SMC) is a prevalent control technique, especially effective for nonlinear systems. Its performance is enhanced if the parameters chosen in the design of the SMC are determined in an optimal way. In this paper an SMC architecture is implemented where support vector regression (SVR) methodology is employed in optimizing one of the design parameters of SMC. A major strength of SVR with respect to gradient based optimization methods is that it finds the global minimum by formulating a convex cost function. The proposed control architecture is tested by simulations performed on an inverted pendulum system. Also, the robustness of the method is justified by additional simulations with measurement noise and disturbance added to the system.
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1,768
|
Please write an abstract with title: SFA-Net: A Selective Features Absorption Network for Object Detection in Rainy Weather Conditions, and key words: Feature extraction, Object detection, Rain, Absorption, Meteorology, Image restoration, Detectors. Abstract: In recent years, object detection approaches using deep convolutional neural networks (CNNs) have derived major advances in normal images. However, such success is hardly achieved with rainy images due to lack of visibility. Aiming to bridge this gap, in this article, we present a novel selective features absorption network (SFA-Net) to improve the performance of object detection not only in rainy weather conditions but also in favorable weather conditions. SFA-Net accomplishes this objective by utilizing three subnetworks, where the feature selection subnetwork is concatenated with the object detection subnetwork through the feature absorption subnetwork to form a unified model. To promote further advancement in object detection impaired by rain, we propose a large-scale rainy image dataset, named srRain, which contains both synthetic rainy images and real-world rainy images for training and testing purposes. srRain is comprised of 25 900 rainy images depicting diverse driving scenarios in the presence of rain with a total of 181 164 instances interpreting five common object categories. Experimental results display that our SFA-Net reaches the highest mean average precision (mAP) of 77.53% on a normal image set, 62.52% on a synthetic rainy image set, 37.34% on a collected natural rainy image set, and 32.86% on a published real rainy image set, surpassing current state-of-the-art object detectors and the combination of image deraining and object detection models while retaining a high speed.
|
1,769
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Please write an abstract with title: Fabrication and Mechanical Analysis of Bioinspired Gliding-optimized Wing Prototypes for Micro Aerial Vehicles, and key words: Prototypes, Fabrication, Three-dimensional displays, Aerodynamics, Three-dimensional printing, Thermoforming, Programmable logic arrays. Abstract: Gliding is the most efficient flight mode that is explicitly appreciated by natural fliers. This is achieved by high-performance structures developed over millions of years of evolution. One such prehistoric insect, locust (Schistocerca gregaria) is a perfect example of a natural glider capable of endured transatlantic flights, which could potentially inspire numerous solutions to the problems in aerospace engineering. However, biomimicry of such aerodynamic properties is hindered by the limitations of conventional as well as modern fabrication technologies in terms of precision and availability, respectively. Therefore, we explore and propose novel combinations of economical manufacturing methods to develop various locust-inspired tandem wing prototypes (i.e. fore and hindwings), for further wind tunnel based aerodynamic studies. Additionally, we determine the flexural stiffness and maximum deformation rate of our prototypes and compare it to their counterparts in nature and literature, recommending the most suitable artificial bioinspired wing for gliding micro aerial vehicle applications.
|
1,770
|
Please write an abstract with title: Regulated Step-Up Power Supplies: Design and Simulation, and key words: Regulators, Power supplies, Capacitors, Prototypes, Rectifiers, Capacitance, Topology. Abstract: This paper presents a technique that can be used in the design of step-up regulated linear power supplies. The proposed technique enables the proper selection of the components that compose the power supply. This power supply increases its input voltage through a full wave voltage doubler, which replaces the typical full bridge rectifier. The selection of the capacitors that compound the voltage doubler is not simple, particularly, when a current-hungry load is connected to the circuit. In this paper a detailed analysis of a full wave voltage doubler is carried out, and simultaneously some design formulas are presented, that can be used very prolifically during the design process. To demonstrate the applicability of the proposed technique an experimental prototype was assembled.
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1,771
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Please write an abstract with title: Towards radical agent-oriented software engineering processes based on AOR modeling, and key words: Software engineering, Object oriented modeling, Ontologies, Testing, Artificial intelligence, Technology management, Information technology, Discrete event simulation, Systems engineering and theory, Analytical models. Abstract: We propose an agent-oriented software engineering process, called RAP, which follows the rational unified process (RUP) in many ways, but is based on agent-object-relationship (AOR) modeling instead of object-oriented modeling. Two particular features of the proposed methodology are: it is supported by a foundational ontology, and it employs a certain form of agent-based discrete event simulation for achieving more agility in the development process.
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1,772
|
Please write an abstract with title: STL mesh re-triangulation in rapid prototyping manufacturing, and key words: Prototypes, Reverse engineering, Genetic algorithms, Shape, Product development, Bridges, Fabrication, Chaos, Manufacturing industries, Industrial engineering. Abstract: STL (stereo lithography) format is the de facto file for rapid prototyping manufacturing. However, it suffers from its drawback in a high degree of redundant vertices. Furthermore, errors in the tessellation process cause inconsistency and incompleteness in the STL file. The purpose of this paper is to present how to simplify STL triangular mesh and get its optimized shape for rapid prototyping manufacturing. The processes for the STL mesh re-triangulation can be set to mesh deletion and mesh reconstruction. In the mesh deletion process, two kinds of weighted value algorithms are used for determining the suitable value of STL meshes deleted. In the process of STL mesh reconstruction, genetic algorithm with its fitness functions is implemented for the optimization of the STL meshes. Two cases of the STL meshes re-triangulation are shown to prove the processes presented in this paper are in good results.
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1,773
|
Please write an abstract with title: Operation Loss Minimization Targeted Distributed Optimal Control of DC Microgrids, and key words: Microgrids, Optimization, Optimal control, Real-time systems, Voltage control, Stability analysis, DC machines, Lyapunov methods. Abstract: DC microgrids are growing in popularity due to their advantages in terms of simplicity and energy efficiency while connecting dc sources and dc loads. In traditional hierarchical schemes, optimization and control are implemented at different time scales. The loose integration lowers its energy efficiency and makes it hard to achieve real-time optimization. Even a slight disturbance can result in deviations of bus voltages and output currents from their optimal operating points. Additionally, most real-time control schemes cannot guarantee the boundedness of individual bus voltages. Targeting these problems, a distributed optimal control algorithm is presented in this article for dc microgrids to minimize operation loss (converter loss and distribution loss) in real time and maintain all bus voltages within predefined ranges. First, the Karuch–Kuhn–Tucker condition of the original constrained optimization problem is converted to an equivalent optimality condition, which is suitable for control design. Then, a distributed control algorithm is designed to drive the system's operating condition toward the optimal one. Convergence to the optima is guaranteed through rigorous Lyapunov-based stability analyses. Finally, simulation studies with a detailed switch-level model demonstrate the merits of the proposed controller.
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1,774
|
Please write an abstract with title: Exploiting Ballistic Electrons in a Uni-Traveling Carrier Traveling Wave Photo-Detector for Efficient Generation of Sub-MM Waves, and key words: Bandwidth, Optical mixing, Microwave generation, Signal generators, Electron optics, Photodiodes. Abstract: The Generation of microwave signals by heterodyning two optical signals has been demonstrated in the past. However, so far this approach is limited in bandwidth, power and efficiency. In this paper we present an analysis of optical heterodyning in the uni-traveling carrier traveling wave photo detector taking into account the effect of ballistic electrons. The analysis is validated by comparison to measurement of an existing device made at the University of California, San Diego. Based on the above analysis a new photodiode design is made, which is expected to have a bandwidth well into the sub-MM wave region. The device exploiting the ballistic electrons effect can reach a bandwidth 2-3 times larger compared to device using velocity-saturated electrons.
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1,775
|
Please write an abstract with title: STIRNet: A Spatial-temporal Interaction-aware Recursive Network for Human Trajectory Prediction, and key words: Measurement, Computer vision, Uncertainty, Computational modeling, Conferences, Predictive models, Trajectory. Abstract: Pedestrian trajectory prediction is one of the important research topics in the field of computer vision and a key technology of autonomous driving system. However, it’s full of challenges due to the uncertainties of crowd motions and complex interactions among pedestrians. We pro-pose a Spatiotemporal Interaction-aware Recursive Net-work (STIRNet) to predict multiply socially acceptable trajectories of pedestrians. In this paper, a recursive structure is used to capture spatio-temporal interactions by spatial modeling and temporal modeling alternately. At each time-step, the spatial interactions are modeled by a graph attention network, in which the nodes feature are represented by temporal motion features. The learned spatial interaction context is used to capture temporal motion features through an LSTM model. The temporal motion features are used to infer future positions and update nodes features. Experimental results on two public pedestrian trajectory datasets (ETH and UCY) demonstrate that our proposed model achieves superior performances compared with state-of-the-art methods on ADE and FDE metrics.
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1,776
|
Please write an abstract with title: Subject-independent natural action recognition, and key words: Humans, Hidden Markov models, Bayesian methods, Fuses, Scattering parameters, Robustness, Pervasive computing, Handicapped aids, Biological system modeling, Joints. Abstract: A primitive-based dynamic Bayesian networks are proposed for subject-independent natural action recognition. Inferred by high-level knowledge, primitives are distinctive features that describe the context information and the motion information representing human action as well as pose. Dynamic Bayesian networks could fuse multi-information so that many kinds of weak information could function as strong information for inference. The experimental results show that primitive-based dynamic Bayesian networks not only increase the recognition rate but also improve the robustness.
|
1,777
|
Please write an abstract with title: The Impact of Structural Change on Green Economy Performance : –Evidence From China, and key words: non-radial directional distance function (NDDF), green economy performance, industrial structural upgrading, generalized method of moments (GMM). Abstract: We apply a non-radial directional distance function (NDDF) for examining the dynamic changes in green economy performance in China, and then examine how industrial structural upgrading affects green economy performance. The analysis framework is developed by the fixed effect model and the generalized method of moments (GMM), using a city-level panel data set during the period of 2007-2014. The results indicate that industrial structural upgrading has a significant positive effect on green economy performance. Further path analyses show that industrial structural upgrading affects green economy performance by improving both energy performance and environmental performance in China. but the influence paths in eastern, central and western regions are different in the heterogeneity analysis.
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1,778
|
Please write an abstract with title: Intelligent virtual assembly planning with integrated assembly model, and key words: Assembly systems, Process planning, Power system planning, Artificial intelligence, Virtual environment, Costs, Educational institutions, Manufacturing, Machine intelligence, Humans. Abstract: Based on the comparison and analysis to automated assemble planning and virtual assembly planning, a new assembly planning method named Intelligent Virtual Assembly Planning (IVAP) is proposed in this paper. After the main idea of IVAP is introduced, the architecture of the IVAP system, and the structure and functions of the main parts are discussed in detail. Then the paper focuses on the Integrated Assembly Model (IAM), which is the kernel part of the IVAP system and is used to represent different types of assembly knowledge and data. At last this paper presents the strategy of Multi-Level Intelligent Assembly Planning that is based on IAM.
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1,779
|
Please write an abstract with title: A Least Squares Solution for Use in the Six-Port Measurement Technique, and key words: Least squares methods, Measurement techniques, Detectors, MESFETs, Microwave theory and techniques, Gallium arsenide, Reflection, Microwave FETs, Broadband amplifiers, System performance. Abstract: Although based on the use of simple amplitude detectors, it is possible to obtain complex values of reflection coefficient, via the six-port technique, from the intersection of three circles in the complex plane. In a typical case, the circle centers are detemined primarily by the six-port design and are nominally constant, while the radii are proportional to the square root of the ratio of the output of three of the detectors to a fourth one. As a practical matter, however, these circles will not intersect in a point because of noise or other errors in the detectors.This paper develops a presedure for choosing Gamma in this context. Moreover, the question of what may be inferred about the system performance from the extent of this intersection failue is briefly considered.
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1,780
|
Please write an abstract with title: An IoT Wearable Communication Prototype Tested in Indoor and Outdoor Environments, and key words: Streaming media, Optical wavelength conversion, Wearable computers, Biomedical monitoring, Testing, Monitoring, Prototypes. Abstract: The fast adaptation of wearable communication (WC) technology to be applied in the broad fields has exhibited the incredible trend improvement for the last decade. In this research project, a typical WC 2.4 GHz prototype was developed and practically examined. This wearable device is initially designed for transferring two kinds of data, i.e. voice data and video streaming within the indoor and outdoor environments. However, the current WC system only provides the functionality of video and pictures streaming. The sensed objects or locations captured using the wearable device placed on human body will be continuously transferred via the access point and immediately broadcasted to the registered server or the permitted receiver station. The first trial testing of the fabricated WC peripheral has demonstrated the excellent data transmission performed on those two different environments. The maximum reliable communication range between the wearable device and the access point that could be maintained for both indoor and outdoor testing was approximately 17 meters. Beyond that communication range, the transmission quality degraded and connection failure was often occurred. The measured power level received at this maximum distance is approximately - 90 dBm. Various specific applications in the modern societies including smart textiles, smart sports monitoring and assessment, e-Health and so on are highly possible to implement by adopting the current scanning and monitoring wearable device.
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1,781
|
Please write an abstract with title: Research for the Multi-trip Vehicle Routing Problem based on Genetic Algorithm, and key words: Costs, NP-hard problem, Heuristic algorithms, Vehicle routing, Decision making, Companies, Mathematical models. Abstract: This paper studies the solution of the Multi-trip Vehicle Routing Problem (MVRP), in which a set of customers have to be served by the same type vehicle. Each vehicle needs to service multiple trips in one working day. The objective is to minimize the total cost with vehicle capacity, service time constraints. The MVRP is a typical NP-Hard problem. And the general accurate algorithm can not find the optimal exact solution, therefore, this paper builds a mathematical model and uses Genetic Algorithm to solve the problem. In order to verify the effectiveness of the Genetic Algorithm, it is applied to the company A and is compared with Mileage Saving Method. The results show that compared with Mileage Saving Method, the Genetic Algorithm has better results, including lower cost and more reasonable route.
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1,782
|
Please write an abstract with title: Linear analysis of ring-type coupled iILO array, and key words: Injection-locked oscillators, MESFETs, Admittance, Performance analysis, Frequency, Bandwidth, Harmonic analysis, Equations, Ring oscillators, Power generation. Abstract: In this paper, expressions on the locking performance of a ring-type coupled MESFET injectionlocked oscillator (ILO) array are presented using nodaladmittance matrix representation. The formulations are derived on a linear approach, hence they are effective in the ILO array design. The locking performance of ILO array includes the free-running frequency, output power and locking bandwidth. The derived formulations are verified with measurement results of a four-element ring-type coupled ILO array.
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1,783
|
Please write an abstract with title: Recurrent Neural Network Based Cognitive Ability Analysis In Mental Arithmetic Task Using Electroencephalogram, and key words: Visualization, Privacy, Neurology, Recurrent neural networks, Calculators, Tools, Signal processing. Abstract: With the rapid increase in the application areas of Machine Learning and the requirement of cognitive ability detection, the use of Electroencephalogram has become a very effective tool to detect and record electrical activities in our brain. The visual inspection of the conventional methods of neurology can be a bit time consuming and affected by artifacts, which lead to inconsistent results later. The novelty in this idea behind cognitive ability analysis using mental arithmetic tasks lies here. In this paper, after collecting EEG data during mental arithmetic tasks performed by forty subjects, we have extracted features using a novel combination of power spectral density and correntropy spectral density method. The identification of cognitive ability using recurrent neural network has been carried out by classifying the subjects into two classes, i.e., good calculator and bad calculator. The bad calculators get asked to practice more for improving their performance in the next trial. The proposed approach outperforms the existing ones in the concerned domain in terms of its performance and it is well suited as it is flexible for all and the privacy of the user is also maintained.
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1,784
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Please write an abstract with title: An integrated LTCC millimeter-wave planar array antenna with low-loss feeding network, and key words: Planar arrays, Antenna feeds, Microstrip antenna arrays, Dielectric substrates, Antenna arrays, Microstrip antennas, Millimeter wave communication, Millimeter wave technology, Millimeter wave radar, Ceramics. Abstract: A novel configuration of millimeter-wave planar array antenna based on low-temperature cofired ceramic (LTCC) technology is investigated. The configuration exploits the three-dimensional (3-D) integration feature of LTCC by incorporating a novel quasi-cavity-backed patch (QCBP) element using a pair of grid-like conductor walls and a mixed feeding network configuration. A proposed LTCC planar array antenna consisting of 16 by 16 elements is designed, manufactured and tested. Good agreement is achieved between the theoretical performance and the measured results.
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1,785
|
Please write an abstract with title: Concurrent error detection in FSMs using transition checking technique, and key words: Circuit faults, Integrated circuit noise, Condition monitoring, Very large scale integration, Error analysis, Integrated circuit technology, High speed integrated circuits, Fault detection, Encoding, Hardware. Abstract: As a complexity of VLSI ICs increases, the inclusion of concurrent error detection is becoming a major concern. In this paper, we address the problem of concurrent error detection in finite state machines (FSMs). In particular, we propose an efficient technique for partial self-checking FSM design based on on-line monitoring of FSM state transitions. We focus primarily on describing an adopted behavioral error model and analytical analysis of the proposed technique. Results concerning error coverage, obtained for benchmark FSMs, are reported.
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1,786
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Please write an abstract with title: Reaching Movements in Dynamic Environments: How Do We Move Flexible Objects?, and key words: Humans, Trajectory, Performance analysis, Springs, Central nervous system, Integral equations, Boundary conditions, Accuracy, Torque, Manipulator dynamics. Abstract: The paper presents an analysis of human reaching movements in manipulation of flexible objects. To predict the trajectory of human hand, a minimum crackle criterion has been recently proposed in literature. A different approach is explored in this paper. To explain the trajectory formation, we resort to the minimum hand jerk criterion. First, we show that this criterion matches well experimental data available in literature. Next, we argue that, contrary to the minimum crackle criterion, the minimum hand jerk criterion produces bounded hand velocity profiles for multi-mass flexible objects. Finally, we present initial experimental results confirming the applicability of the minimum hand jerk criterion in manipulation of multi-mass objects.
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1,787
|
Please write an abstract with title: Sensivity Factors-based Congestion Management in Inter-regional Electricity Spot Market, and key words: Electrical engineering, Analytical models, Sensitivity analysis, Asia, Load flow. Abstract: This paper proposed a sensitivity factors-based congestion management method for inter-regional electricity spot market in China. Implicit auctioning is adopted to manage the congestion on inter-regional UHVDC lines. When congestion occur on in-regional AC lines, the MW-flow of congestion AC line is modeled as the linear function of the MW-flow of inter-regional UHVDC lines by sensitivity analysis. By explicitly introducing the linear constraints of AC line congestion, the feasibility of inter-regional trading can be ensured by market clearing. The simulation on a 3-regions test system verifies the effectiveness and correctness of proposed method.
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1,788
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Please write an abstract with title: Improved classification and grading of interferents in serum specimens using machine learning, and key words: Image segmentation, Image color analysis, Color, Quality control, Machine learning, Interference, Feature extraction. Abstract: Serum specimens containing interferents affect the accuracy of test results through a variety of mechanisms. Consequently, rigorous quality control of serum samples before biochemical analysis may help prevent incorrect results. Based on the hypothesis that serum color images contain information about the category and concentration of interferents, a machine learning method was proposed to automatically classify and grade color images of serum samples into three categories and five levels of interferent concentration. First, using a color correction method, the color image was preprocessed to eliminate ambient light color cast during the shooting process. Serum regions were then segmented using a convolutional neural network. Subsequently, color moment features were extracted and utilized in the classification of hemolysis, icterus, and lipemia (HIL), the three most common interferents in blood examinations. Finally, feature selection was utilized to select the most suitable features for grading the degree of HIL. This feature subset was used to grade five concentration levels for each category. The Dice coefficient and IoU of the serum region segmentation results were 96.36% and 93.02%, respectively. The accuracy and F1-score for classification were both 1. For the grading task, the accuracies were 0.9829, 0.9876, and 0.9526, and Fl-scores were 0.9828, 0.9876, and 0.9520 for hemolysis, icterus, and lipemia, respectively. The proposed method can successfully identify if a sample contains HIL interference and grade the degree of interferent concentration, providing an efficient and feasible method for serum quality control.
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1,789
|
Please write an abstract with title: Z-scan measurements of the nonlinear refractive indices of novel Yb-doped laser crystal hosts, and key words: Optical refraction, Laser mode locking, Crystals, Pump lasers, Semiconductor diodes, Ultrafast optics, Crystalline materials, Optical materials, Optimized production technology, Optical pulse generation. Abstract: The nonlinear refractive indices of novel Yb-doped, borate laser crystal hosts (GdCOB, YCOB, BOYS) were characterized. The results indicate that these laser crystals are promising candidates for diode-pumped Kerr-lens mode-locked operation.
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1,790
|
Please write an abstract with title: Intrusion-Tolerant and Confidentiality-Preserving Publish/Subscribe Messaging, and key words: Access control, Distributed ledger, Fabrics, Reliability. Abstract: We present Chios, an intrusion-tolerant publish/subscribe system which protects against Byzantine failures. Chios is the first publish/subscribe system achieving decentralized confidentiality with fine-grained access control and strong publication order guarantees. This is in contrast to existing publish/subscribe systems achieving much weaker security and reliability properties. Chios is flexible and modular, consisting of four fully-fledged publish/subscribe configurations (each designed to meet different goals). We have deployed and evaluated our system on Amazon EC2. We compare Chios with various publish/subscribe systems. Chios is as efficient as an unreplicated, single-broker publish/subscribe implementation, only marginally slower than Kafka and Kafka with passive replication, and at least an order of magnitude faster than all Hyperledger Fabric modules and publish/subscribe systems using Fabric.
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1,791
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Please write an abstract with title: A mediating model of employee retention for high tech firms in the PRC, and key words: Partial response channels, Contracts, Psychology, Technology management, Joining processes. Abstract: This study examined how differential perceptions of employer's offered inducements influenced employees' turnover intention, using data from 50 high-tech firms in the PRC. Results demonstrated that employees' trust in their employers mediated the relationship between differential perceptions of employers' offered inducements and employees' turnover intention, but not the relationship between employers' offered inducements per se and employee's turnover intention.
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1,792
|
Please write an abstract with title: FRP hot stick flashovers during EHV live line work, and key words: Fiber reinforced plastics, Flashover, Testing, Temperature, Dielectric measurements, Poles and towers, Insulation, Conductors, Surges, Air gaps. Abstract: In 1997 a FRP hot stick flashed over during live line work at 550 kVac. A rigorous maintenance program was instituted and all FRP hot sticks used in live line work must now withstand an annual dielectric test at 105 kVdc per 305 mm with the surface wet consistent with IEEE Std 978. More frequent electrical tests are made using a hand held tester and limits have been set for the hydrophobicity of the surface. In spite of these measures a second flashover a FRP hot stick occurred during live line work at 550 kVac in 2002. Both flashovers occurred during work from the tower on "v" suspension insulators, the first at a temperature near the freezing point and the second at a temperature well below freezing. In both cases the wind was blowing from the conductor to the worker. Our investigation is trying to establish an adequate explanation for these events as well as corrective measures. The work to date is summarized in this paper. Industry standards for limits of approach are based on the switching surge withstand of air gaps and should not be equated to the minimum safe leakage distance of FRP hot sticks.
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1,793
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Please write an abstract with title: Evaluation of Signal Degradation Due to Birefringence in a Multiple Reference Optical Coherence Tomography System With Polarization-Based Balanced Detection, and key words: Optical fibers, Mirrors, Optical polarization, Optical imaging, Detectors, Sensitivity, Optical interferometry. Abstract: Although time-domain optical coherence tomography (TD-OCT) systems are straightforward to realize, the imaging speed, sensitivity, and imaging depth limit their range of applications. Multiple reference optical coherence tomography (MR-OCT) based on TD-OCT increases imaging range by about tenfold while providing sensitivity to image highly scattering biological samples. The multiple path-delays and free-space construction make MR-OCT also interesting for hybrid and compact systems, filling the gap between fibre-based and wafer-level integrated optical systems. We describe an optical configuration using a balanced detection scheme and the resulting signal properties due to the required use of polarizing optical components. We numerically simulate the signal properties using Jones calculus and compare the results with measurements. We discuss the origin of signal degradation due to birefringence of the sample in OCT and show that the quarter-wave plate in the sample arm of the Michelson interferometer can be adjusted to optimize the signal returning from a birefringent sample thereby improving the visibility of structures of interest. The theory discussed will be useful to understand and minimize signal degradation due to birefringence in Time-Domain and Fourier-Domain OCT systems.
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1,794
|
Please write an abstract with title: An Unsupervised Model for Identifying and Characterizing Dark Web Forums, and key words: Monitoring, Data breach, Data models, Tools, Clustering algorithms, Crawlers, Portals. Abstract: Dark Web forums are significantly exploited to trade confidential information and illicit products by criminals. This paper addresses the problem of how to identify the cluster of discussion forums and their characteristics on the Dark Web. Exiting methods are mostly dependent on the continuous labeled contents, which are expensive and not feasible due to the nature of Dark Web data. Therefore, an approach that does not need a continuous availability of labeled forum and related knowledge is required. To this end, we propose an unsupervised model to identify and characterize Dark Web forums by combining clustering algorithm and decision tree algorithm. The proposed method presents the characteristics in an explainable form that can be used by the cyber threat intelligence system and law enforcement as scientific evidence to analyze any data breach or illicit activities in the Dark Web forums. To evaluate the performance of our model comprehensive experiments were conducted using real Dark Web forum data. The proposed approach achieves 98% accuracy and F1 score of 98% validating the efficacy of our proposed model to successfully characterize Dark Web forums. The experimental results suggest that the proposed model could be useful to the cyber threat intelligence and law enforcement community for building an intelligent source of knowledge that can be used for detecting data breach and illicit activities happening in the Dark Web forums.
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1,795
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Please write an abstract with title: Strategic Versus Tactical Design, and key words: Algorithm design and analysis, Application software, Computer languages, Software architecture, Computer science, Software engineering, Software standards, Software algorithms, Computer architecture. Abstract: We seek to distinguish Strategic design decisions (e.g., to adopt a programming paradigm, architectural style, CBSE standard or application framework) from tactical design decisions (e.g. to use a design pattern, refactoring or programming idiom). This distinction is important since strategic statements carry far-reaching implications over the implementation and therefore must be made early in the development process, whereas tactical statements have localized effect and must be deferred to a latter stage in the process. We formulate the Locality criterion, a well-defined and language-independent criterion which divides all design statements in two abstraction classes. We apply our criterion to a broad range of statements and demonstrate that strategic statements are non-local and that tactical design statements are local. We also demonstrate that assumptions leading to architectural mismatch are non-local.
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1,796
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Please write an abstract with title: A novel surface-mount RF delay filter for feedforward LPAs, and key words: Radio frequency, Filters, Ceramics, Delay lines, Coaxial components, Microstrip, Surface impedance, Inverters, Bandwidth, Circuit optimization. Abstract: A novel time-delay filter design is presented that uses a cascade of surface-mount coaxial ceramic delay lines. Quarter-wave microstrip lines are used as impedance inverters to extend the operating bandwidth of the ceramic delay lines. Ideally, no tuning is involved. A theoretical analysis is presented. Two different high-power low-loss delay filters are simulated, built and tested for the 869-894 MHz cellular band. Performance limitations due to circuit parasitics are discussed.
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1,797
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Please write an abstract with title: COOKIE: Contrastive Cross-Modal Knowledge Sharing Pre-training for Vision-Language Representation, and key words: Visualization, Computer vision, Codes, Computational modeling, Image retrieval, Semantics, Transformers. Abstract: There has been a recent surge of interest in cross-modal pre-training. However, existed approaches pre-train a one-stream model to learn joint vision-language representation, which suffers from calculation explosion when conducting cross-modal retrieval. In this work, we propose the Contrastive Cross-Modal Knowledge Sharing Pretraining (COOKIE) method to learn universal text-image representations. There are two key designs in it, one is the weight-sharing transformer on top of the visual and textual encoders to align text and image semantically, the other is three kinds of contrastive learning designed for sharing knowledge between different modalities. Cross-modal knowledge sharing greatly promotes the learning of unimodal representation. Experiments on multi-modal matching tasks including cross-modal retrieval, text matching, and image retrieval show the effectiveness and efficiency of our pre-training framework. Our COOKIE finetuned on cross-modal datasets MSCOCO, Flickr30K, and MSRVTT achieves new state-of-the-art results while using only 3/1000 inference time comparing to one-stream models. There are also 5.7% and 3.9% improvements in the task of image retrieval and text matching. Source code will be available at https://github.com/kywen1119/COOKIE.
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1,798
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Please write an abstract with title: A Broadband Linear to Circular Polarization Converter for 5G Millimeter Wave Communication, and key words: Polarization, 5G mobile communication, Millimeter wave technology, Metals, Bandwidth, Frequency conversion, Metasurfaces. Abstract: This paper presents a design and simulation of a subwavelenth polarization converter unit operating in 5G millimeter wave frequency. The converter consists of two metal metasurface patterns and a dielectric layer sandwiched by the two metasurfaces. Simulation shows that the converter owns more than 3 GHz bandwidth with axial ratio of circular polarization lower than 3 dB, insertion loss less than 1.5 dB, and VSWR lower than 2, which can adapt to the millimeter wave frequency band of 5G communication.
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1,799
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Please write an abstract with title: Current Sensor-Less Virtual Synchronous Generator Model Predictive Control Based on Sliding Mode Observer, and key words: Inverters, Voltage control, Capacitors, Reactive power, Observers, Frequency modulation, Inductance. Abstract: In recent years, virtual synchronous generator (VSG) control algorithm has been widely studied in distributed grid-connected power inverters to deal with active and reactive power adjustment by simulating the operation principle of the actual synchronous generator. Nevertheless, once the current sensor fails, the grid-connected power inverter will lose its stability. To enhance the fault-tolerant operation ability of the grid-connected power inverter, a new inverter side current sensor-less model predictive control method based on sliding mode observer (SMO) is proposed. The stability of the SMO is analyzed by using the Lyapunov stability criterion. The gains of the SMO are then designed by analyzing their influences on the current and voltage observation based on the closed-loop transfer functions. Besides, to show the influences of the capacitance changes on the current observation, a detailed parameter sensitivity analysis is also carried out. Then, by using the estimated inductance current from the SMO, a current sensor-less model predictive control method is finally proposed. The main novelty of the proposed method is that both the output voltage of the inverter and the inverter side inductance are not required in the proposed SMO. So, the accuracy of current sensor-less control is improved. To verify the effectiveness of the proposed method, detailed experimental studies are carried out based on a Typhoon and PE-Expert 4 based experimental platform.
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