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"abstract": "Delaunay triangulation and Voronoi diagram are widely used in computer graphics, computational geometry and other fields. Different from the planar case, Delaunay triangulation of a point set on smooth 2-manifolds does not always exist. In this paper we propose a new sampling requirement combining the maximal curvature, injectivity radius and convexity radius to guarantee the existence of Delaunay triangulation on 2-manifolds. After introducing the primal/dual efficient representation (PDER) structure [26], we develop a generalized PDER which not only represents Delaunay/Voronoi dual simply and efficiently, but also describes the surfaces with boundaries. Taking advantage of several operators for modeling and updating models, we employ generalized PDER to construct and operate Delaunay/Voronoi dual dynamically on smooth 2-manifolds. The generalized PDER is also a powerful tool for dual subdivision schemes. Many examples demonstrate the feasibility of our method and the generalized PDER.",
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"abstract": "We present a multiple illumination technique that directly recovers the viewer-centered curvature matrix up to a scalar factor, at each mutually illuminated point on a smooth object surface. This technique is completely independent of knowledge of incident illumination orientation, local surface orientation, or diffuse surface albedo. The cornerstone of this technique is the use of the integrability constraint which is a fundamental mathematical property of smooth surfaces. The integrability constraint allows the derivation of an equation at each object point, which is linear in terms of quantities involving the initially unknown parameters of incident illumination orientation. These quantities, which we call the gradient ratio constants, can be simultaneously solved for from five or more equations arising from the same number of object points. We show that deriving these gradient ratio constants provides just enough calibration information about incident illumination geometry to compute the viewer-centered curvature matrix at each object point, up to a scalar multiple. We demonstrate two important applications of this technique: segmentation of the object surface by sign of Gaussian curvature, and further segmentation of non-negative Gaussian curvature into convexity and concavity.<>",
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"title": "Generalized Ball Curves of Ninth Degree",
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"abstract": "Two kinds of polynomial bases with parameter are constructed in this paper. Based on these bases, two kinds of curves with shape parameter are defined. The first kind of curve contained the Wang-Ball and Said-Ball curve of ninth degree and many curves located between them. The second kind of curve contained the Said-Ball and Bézier curve of ninth degree and many curves located between them. By analyzing the relation between the new curves and the Bézier curve of ninth degree, the geometric meaning of the shape parameters are gotten, and the geometrical drawing method of the new curves are given out in virtue of the de-Casteljau algorithm of the Bézier curve.",
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"abstract": "Pairing-based protocols are getting popular in many cryptographic applications. Pairing algorithms involve computations on elements in all three pairing groups, G_1, G_2 and G_3; however, most protocols usually require additional scalar multiplication and exponentiation in any of these three groups. The Gallant-Lambert-Vanstone (GLV) method is an elegant technique to accelerate the scalar multiplication which can reduce the number of elliptic curve doubling by using Straus-Shamir simultaneous multi-scalar multiplication technique. However, efficiently computable endomorphisms are required to apply GLV for the elliptic curves. This paper shows the GLV technique by deriving efficiently computable endomorphism for Kachisa-Schaefer-Scott (KSS) curve defined over degree 16 extension field. In addition, the authors show explicit formulas to compute the GLV method together with Straus-Shamir simultaneous multi-scalar multiplication technique for 2, 4 and 8 dimensions in G2 group. The comparative implementation shows that dimension 4 gives faster computational time than dimension 8 and 2.",
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"content": "Pairing-based protocols are getting popular in many cryptographic applications. Pairing algorithms involve computations on elements in all three pairing groups, G_1, G_2 and G_3; however, most protocols usually require additional scalar multiplication and exponentiation in any of these three groups. The Gallant-Lambert-Vanstone (GLV) method is an elegant technique to accelerate the scalar multiplication which can reduce the number of elliptic curve doubling by using Straus-Shamir simultaneous multi-scalar multiplication technique. However, efficiently computable endomorphisms are required to apply GLV for the elliptic curves. This paper shows the GLV technique by deriving efficiently computable endomorphism for Kachisa-Schaefer-Scott (KSS) curve defined over degree 16 extension field. In addition, the authors show explicit formulas to compute the GLV method together with Straus-Shamir simultaneous multi-scalar multiplication technique for 2, 4 and 8 dimensions in G2 group. The comparative implementation shows that dimension 4 gives faster computational time than dimension 8 and 2.",
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"proceeding": {
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"title": "2010 IEEE Fifth International Conference on Networking, Architecture, and Storage",
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"doi": "10.1109/NAS.2010.36",
"title": "High Performance Flow Feature Extraction with Multi-core Processors",
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"abstract": "Next generation networks anticipate an increasing amount of network traffic from a wide range of emerging network applications. The features of packet flows (such as the minimal packet inter-arrival time and the number of packets with non-zero options in TCP headers) are used frequently in determining the traffic type and applying security policies. However, the extraction of flow features is difficult due to the increasing line rates, a broad range of network protocols, and a variety of complex flow features. In this paper, we leverage the multi-core processors to speed up the feature extraction process. We design an open source parallel software tool, aiming for processing network packet flows in real-time. We implement the software in four different designs including serial, parallel, pipelined and hybrid architectures. We evaluate the performance of the parallel software tool through measurement experiments. Our experimental results show that each method increases the packet processing throughput by 5-7% in comparison with the previous method. And finally the implementation based on the hybrid architecture improves the packet processing performance by 19.3% than the implementation based on the serial architecture.",
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"content": "Next generation networks anticipate an increasing amount of network traffic from a wide range of emerging network applications. The features of packet flows (such as the minimal packet inter-arrival time and the number of packets with non-zero options in TCP headers) are used frequently in determining the traffic type and applying security policies. However, the extraction of flow features is difficult due to the increasing line rates, a broad range of network protocols, and a variety of complex flow features. In this paper, we leverage the multi-core processors to speed up the feature extraction process. We design an open source parallel software tool, aiming for processing network packet flows in real-time. We implement the software in four different designs including serial, parallel, pipelined and hybrid architectures. We evaluate the performance of the parallel software tool through measurement experiments. Our experimental results show that each method increases the packet processing throughput by 5-7% in comparison with the previous method. And finally the implementation based on the hybrid architecture improves the packet processing performance by 19.3% than the implementation based on the serial architecture.",
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"title": "The \"Which Blair Project\": A Quick Visual Method for Evaluating Perceptual Color Maps",
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"abstract": "We have developed a fast, perceptual method for selecting color scales for data visualization that takes advantage of our sensitivity to luminance variations in human faces. To do so, we conducted experiments in which we mapped various color scales onto the intensitiy values of a digitized photograph of a face and asked observers to rate each image. We found a very strong correlation between the perceived naturalness of the images and the degree to which the underlying color scales increased monotonically in luminance. Color scales that did not include a monotonically-increasing luminance component produced no positive rating scores. Since color scales with monotonic luminance profiles are widely recommended for visualizing continuous scalar data, a purely visual technique for identifying such color scales could be very useful, especially in situations where color calibration is not integrated into the visualization environment, such as over the Internet.",
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"abstract": "With the Debay's potentials, it is obtained an exact solution for the problem of the electromagnetic radiation interaction with a lamellar spherical lens consisted of an arbitrary number of layers with complex refraction indexes. The solution is constructed by using the translation matrixes, enabling to transfer corresponding boundary conditions between the layers. The elaborated method determines the lens' absorption, scattering, and extinction in terms of the layers' characteristics. This allows one to solve the problem of synthesis of heterogeneous spherical lens with required radio-technical characteristics.",
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"abstract": "In this study, a method realizing real-time color-tunable white light-emitting diodes (LEDs) through the combination of phosphor patterns and adaptive liquid lens is proposed. The phosphor patterns with red ring and yellow ring was fabricated on an Indium Tin Oxides glass (ITO glass) plate by the screen printing process. The ITO glass is set to be the electrode to change the lens shape. And a liquid transparent silicon oil is dispensed around the LED chip as a lens. The phosphor layer plate with the remote arrangement in the LED modules. And an air gap exists between the lens and the phosphor layer. With applying an electric field and the surface tension around the liquid lens, the lens shape would vary into different shapes such as cone or \"bowl\" or \"sandglass\" and so on. Different lens shapes change the blue light intensity distribution on the ITO glass. Consequently, it results in varying the ratio of absorbed blue light by red phosphor and yellow phosphor and the emission spectra of the LED. The experimental results show that the average correlated color temperature (CCT) can be adjusted from 1928 K to 7260 K. The color rendering index (CRI) keep the value larger than 70 in the whole CCT range. This study has proved that the proposed real-time tunable color method is high-efficiency and practical for developing smart color white LEDs.",
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"content": "In this study, a method realizing real-time color-tunable white light-emitting diodes (LEDs) through the combination of phosphor patterns and adaptive liquid lens is proposed. The phosphor patterns with red ring and yellow ring was fabricated on an Indium Tin Oxides glass (ITO glass) plate by the screen printing process. The ITO glass is set to be the electrode to change the lens shape. And a liquid transparent silicon oil is dispensed around the LED chip as a lens. The phosphor layer plate with the remote arrangement in the LED modules. And an air gap exists between the lens and the phosphor layer. With applying an electric field and the surface tension around the liquid lens, the lens shape would vary into different shapes such as cone or \"bowl\" or \"sandglass\" and so on. Different lens shapes change the blue light intensity distribution on the ITO glass. Consequently, it results in varying the ratio of absorbed blue light by red phosphor and yellow phosphor and the emission spectra of the LED. The experimental results show that the average correlated color temperature (CCT) can be adjusted from 1928 K to 7260 K. The color rendering index (CRI) keep the value larger than 70 in the whole CCT range. This study has proved that the proposed real-time tunable color method is high-efficiency and practical for developing smart color white LEDs.",
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"abstract": "Caricature, a type of exaggerated artistic portrait, amplifies the distinctive, yet nuanced traits of human faces. This task is typically left to artists, as it has proven difficult to capture subjects' unique characteristics well using automated methods. Recent development of deep end-to-end methods has achieved promising results in capturing style and higher-level exaggerations. However, a key part of caricatures, face warping, has remained challenging for these systems. In this work, we propose AutoToon, the first supervised deep learning method that yields high-quality warps for the warping component of caricatures. Completely disentangled from style, it can be paired with any stylization method to create diverse caricatures. In contrast to prior art, we leverage an SENet and spatial transformer module and train directly on artist warping fields, applying losses both prior to and after warping. As shown by our user studies, we achieve appealing exaggerations that amplify distinguishing features of the face while preserving facial detail.",
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"abstract": "In this paper we introduce a new model of the mechanics of a finger pad that is efficient to simulate. The model simplifies the finger pad mechanics by assuming it to be a thin shell enclosing fluid-like material. Unlike similar approaches in the literature, we incorporate the bending stiffness of the skin and a subject-specific geometric model into the simulation. Thanks to these two features, our model can predict the surface deflection of the whole finger pad with the error of 0.2 to 0.4 mm with reasonable computational cost.",
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"abstract": "We report on a novel method and system for investigation of hydrogenated nanocrystalline silicon (nc-Si:H) thin films' piezoresistive effect, and a measurement system for gauge factor of nc-Si:H thin films is designed based on four-point bending method. nc-Si:H thin film resistor is deposited onto glass beam by plasma-enhanced chemical vapor deposition (PECVD) technique. Fractional strain of strained nc-Si:H thin films is measured by PSD sensor based on laser triangulation method, and relative change in resistance of strained nc-Si:H thin films is read out by Wheatstone bridge, when nc-Si:H thin film resistor is under a uniform stress. All signals, including converted and conditioned signal outputting from PSD sensor and output of Wheatstone bridge, are acquired by PXI data acquisition system with industry's most accurate 71/2-digit digital multi-meter, and then gauge factor of nc-Si:H thin films is achieved by programming. The experimental results show that the measurement system for nc-Si:H thin films' gauge factor has solved the problem of thin film materials' gauge factor measurement, and based on the system the level of automation, precision and efficiency in measurement has been improved, and more importantly, the measurement system has provided the experimental basis for investigation of nc-Si:H thin films' piezoresistive effect.",
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"content": "We report on a novel method and system for investigation of hydrogenated nanocrystalline silicon (nc-Si:H) thin films' piezoresistive effect, and a measurement system for gauge factor of nc-Si:H thin films is designed based on four-point bending method. nc-Si:H thin film resistor is deposited onto glass beam by plasma-enhanced chemical vapor deposition (PECVD) technique. Fractional strain of strained nc-Si:H thin films is measured by PSD sensor based on laser triangulation method, and relative change in resistance of strained nc-Si:H thin films is read out by Wheatstone bridge, when nc-Si:H thin film resistor is under a uniform stress. All signals, including converted and conditioned signal outputting from PSD sensor and output of Wheatstone bridge, are acquired by PXI data acquisition system with industry's most accurate 71/2-digit digital multi-meter, and then gauge factor of nc-Si:H thin films is achieved by programming. The experimental results show that the measurement system for nc-Si:H thin films' gauge factor has solved the problem of thin film materials' gauge factor measurement, and based on the system the level of automation, precision and efficiency in measurement has been improved, and more importantly, the measurement system has provided the experimental basis for investigation of nc-Si:H thin films' piezoresistive effect.",
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"normalizedAbstract": "We report on a novel method and system for investigation of hydrogenated nanocrystalline silicon (nc-Si:H) thin films' piezoresistive effect, and a measurement system for gauge factor of nc-Si:H thin films is designed based on four-point bending method. nc-Si:H thin film resistor is deposited onto glass beam by plasma-enhanced chemical vapor deposition (PECVD) technique. Fractional strain of strained nc-Si:H thin films is measured by PSD sensor based on laser triangulation method, and relative change in resistance of strained nc-Si:H thin films is read out by Wheatstone bridge, when nc-Si:H thin film resistor is under a uniform stress. All signals, including converted and conditioned signal outputting from PSD sensor and output of Wheatstone bridge, are acquired by PXI data acquisition system with industry's most accurate 71/2-digit digital multi-meter, and then gauge factor of nc-Si:H thin films is achieved by programming. The experimental results show that the measurement system for nc-Si:H thin films' gauge factor has solved the problem of thin film materials' gauge factor measurement, and based on the system the level of automation, precision and efficiency in measurement has been improved, and more importantly, the measurement system has provided the experimental basis for investigation of nc-Si:H thin films' piezoresistive effect.",
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"title": "Comparative study on the calculation results of finite element modeling of downlead of substation based on beam element and rod element",
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"abstract": "This paper mainly uses Beam188 and Link180 elements to establish the finite element model of four-split downlead, calculates the influence of the span on the restraint end tension of the two finite element models, and analyzes the finite element model of the beam element without considering the degree of freedom of rotation. The influence of bending stiffness on the tension of restrained end nodes, and the calculation results are compared with the calculation results of the rod element. The results show that the beam element finite element model can more realistically simulate the force characteristics of the four-split downlead.",
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{
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"content": "This paper mainly uses Beam188 and Link180 elements to establish the finite element model of four-split downlead, calculates the influence of the span on the restraint end tension of the two finite element models, and analyzes the finite element model of the beam element without considering the degree of freedom of rotation. The influence of bending stiffness on the tension of restrained end nodes, and the calculation results are compared with the calculation results of the rod element. The results show that the beam element finite element model can more realistically simulate the force characteristics of the four-split downlead.",
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"authors": [
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"affiliation": "State Grid XinJiang Company Limited Electric Power Research Institute, Urumqi, Xinjiang Uygur Autonomous,Region,China",
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"affiliation": "State Grid Xinjiang Electric Power Co., Ltd, Urumqi, Xinjiang Uygur Autonomous,Region,China",
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"abstract": "Algorithms for Boolean operations using BSP trees and other algorithms have problems with efficiency and robustness. In order to improve the speed and correctness of operations, a new algorithm for Boolean operations on polygonal meshes was presented. In this algorithm, a fast collision detection algorithm based on oriented bounding box (OBB) was employed, which speed up the intersection test between every two triangles of two different polygonal meshes. After getting the intersection segments, the polygons can be obtained from intersected triangles and intersection segments, then establish the intersection region. Finally, the ultimate result was obtained by acceptance or rejection for the other meshes based on intersection region and the neighborhood of these meshes. In this algorithm, orientability, topology and other geometric characteristics are made full use of. The result shows that the algorithm is efficient and robust. Furthermore, it can apply to both closed meshes and open meshes.",
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"abstract": "We present a strategy to preserve contrast over a deeper range of imaging depths in the context of confocal microscopy using low-power (0.5 mW) diode laser illumination. While the dual-axis confocal microscope architecture's intersecting illumination and collection beams significantly improves the spatial-filtering and optical-sectioning performance of confocal microscopy, we propose that modulating the spatial alignment of the dual-axis beams at a frequency f will generate a focal volume signal modulated at 2f, which further provides nearly an order-of-magnitude improvement in optical-sectioning contrast. Lock-in detection is used to remove the unmodulated background light, thereby enhancing our ability to image deeply within highly scattering tissues.",
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"abstract": "In this paper, we propose a new method to reconstruct high resolution images from structured illumination microscopy. It consists of estimating the illumination pattern parameters with a multiscale analysis in the Fourier domain and filtering the significative features with a statistical test. Our method is fast and automatic, aiming at being computationally effective for in vivo biomedical applications.",
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"abstract": "We introduce a framework for analyzing symmetry of 3D anatomical structures using elastic deformations of their boundaries (surfaces). The basic idea is to define a space of parameterized surfaces and to compute geodesic paths between the objects and their arbitrary reflections using a Riemannian structure. Elastic matching, based on optimal (non-linear) re-parameterizations (grid deformations) of surfaces, provides a better registration of points across shapes, as compared to the commonly-used linear registrations. A crucial step of orientation alignment, akin to finding planes of symmetry, is performed as a search for shortest geodesic paths. This framework is fully automatic and provides a measure of symmetry, the nearest symmetric shape and the optimal deformation to make an object symmetric. We demonstrate this framework through multiple toy examples on simple and complicated surfaces. We also explore the use of symmetry analysis in differentiating between healthy and subjects with Attention Deficit Hyper-activity Disorder.",
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"abstract": "Unrealistic Mixed Reality (MR) experiences can be caused by unprocessed occlusions between real and augmented objects during interactions. Depth knowledge is indeed key to achieve a seamless visualisation when a bare hand interacts with an augmented object. This can be addressed by blending real-time 3D finger tracking information with the visualisation of the hand in MR. We propose an approach that automatically localises the hand in RGB images and associates the respective depth, estimated with an auxiliary infrared stereo camera used for hand tracking, to each RGB hand pixel. Because misalignments between the outline of the hand and its depth may occur due to tracking errors, we use the distance transform algorithm to densely associate depth values to hand pixels. In this way hand and augmented object depths can be compared, and the object can be rendered accordingly. We evaluate our approach by using an MR setup composed of a smartphone and a Leap Motion mounted on it. We analyse several hand configurations and measure the erroneously classified pixels when occlusions occur.",
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"abstract": "Using one’s hands can be a natural and intuitive method for interacting with 3D objects in a mixed reality environment. This study explores three hand-interaction techniques, including the gaze and pinch, touch and grab, and worlds-in-miniature interaction for selecting and moving virtual furniture in the 3D scene. Overall, a comparative analysis reveals that the worlds-in-miniature provided the best usability and task performance than other studied techniques. We also conducted in-depth interviews and analyzed participants’ hand gestures in order to identify desired attributes for 3D hand interaction design. Findings from interviews suggest that, when it comes to enjoyment and discoverability, users prefer directly manipulating the virtual furniture to interacting with objects remotely or using in-direct interactions such as gaze. Another insight this study provides is the critical roles of the virtual object’s visual appearance in designing natural hand interaction. Gesture analysis reveals that shapes of furniture, as well as its perceived features such as weight, largely determined the participant’s instinctive form of hand interaction (i.e., lift, grab, push). Based on these findings, we present design suggestions that can aid 3D interaction designers to develop a natural and intuitive hand interaction for mixed reality.",
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"content": "Using one’s hands can be a natural and intuitive method for interacting with 3D objects in a mixed reality environment. This study explores three hand-interaction techniques, including the gaze and pinch, touch and grab, and worlds-in-miniature interaction for selecting and moving virtual furniture in the 3D scene. Overall, a comparative analysis reveals that the worlds-in-miniature provided the best usability and task performance than other studied techniques. We also conducted in-depth interviews and analyzed participants’ hand gestures in order to identify desired attributes for 3D hand interaction design. Findings from interviews suggest that, when it comes to enjoyment and discoverability, users prefer directly manipulating the virtual furniture to interacting with objects remotely or using in-direct interactions such as gaze. Another insight this study provides is the critical roles of the virtual object’s visual appearance in designing natural hand interaction. Gesture analysis reveals that shapes of furniture, as well as its perceived features such as weight, largely determined the participant’s instinctive form of hand interaction (i.e., lift, grab, push). Based on these findings, we present design suggestions that can aid 3D interaction designers to develop a natural and intuitive hand interaction for mixed reality.",
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"affiliation": "University of Florida",
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"abstract": "With the increasing number of motorized vehicles, road accidents are increasing year by year all over the world.. After an accident, the police investigate the circumstances of the incident and determine each actor's responsibilities. Our goal is to create a police support system. We focused on a multi-agent system that predicts each actor's responsibility in a road accident (especially crossroad accidents). The system uses the driving recorder video of a vehicle as the input data source, and it outputs the prediction of the responsibility of each actor in the accident. It consists of three agents: (1) Crash time detection and crash video split into images; (2) Traffic signs detection in the crash video; (3) Responsibility prediction using a knowledge system.",
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"affiliation": "Nagoya Institute of Technology,Graduate School of Engineering,Department of Computer Science,Nagoya,Japan",
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"affiliation": "Nagoya Institute of Technology,Graduate School of Engineering,Department of Computer Science,Nagoya,Japan",
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"abstract": "In recent years, hand drawn sketch based 3D model retrieval method has become a popular research area due to the rapid growth of available 3D models on the Internet. However, most existing sketch based 3D model retrieval methods only consider using low-level visual features that cannot capture users'search intention. In this paper, we propose a novel sketch-based 3D model retrieval approach by using LDA method to generate topics address these issues. Topics can provide a more descriptive and discriminative meaningful representation rather than low-level feature descriptors, which span the semantic gap between 3D models and hand-drawn sketches. Firstly, we generate 2D views of 3D models in the database. Then we extract low-level features from query sketch and 2D views of 3D models and encode them as visual words. Lastly, we adopt LDA method to achieve topics distribution based on these visual words. So the 3D models which have similar topics as the query sketch can be returned to the user. The experiment results demonstrate that our method can achieve more accurate retrieval results and have a superior performance than other previously proposed methods which merely used low-level feature descriptors.",
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"content": "In recent years, hand drawn sketch based 3D model retrieval method has become a popular research area due to the rapid growth of available 3D models on the Internet. However, most existing sketch based 3D model retrieval methods only consider using low-level visual features that cannot capture users'search intention. In this paper, we propose a novel sketch-based 3D model retrieval approach by using LDA method to generate topics address these issues. Topics can provide a more descriptive and discriminative meaningful representation rather than low-level feature descriptors, which span the semantic gap between 3D models and hand-drawn sketches. Firstly, we generate 2D views of 3D models in the database. Then we extract low-level features from query sketch and 2D views of 3D models and encode them as visual words. Lastly, we adopt LDA method to achieve topics distribution based on these visual words. So the 3D models which have similar topics as the query sketch can be returned to the user. The experiment results demonstrate that our method can achieve more accurate retrieval results and have a superior performance than other previously proposed methods which merely used low-level feature descriptors.",
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"title": "An Adaptive Slicing Thickness Adjustment Method Based on Cloud Point in 3D Printing",
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"abstract": "This paper introduces an approach for slicing thickness adaptively based on cloud point that aims at the problem of a large amount of data, inefficiency and low precision of 3D printing. The proposed method can select the optimum slicing thickness adaptively based on error analysis of point cloud belt in unified slicing direction by adopting the optimizing quadtree structure of point cloud to store point cloud data. In view of the different complexity model to evaluate the experiment. The result demonstrates that the computational complexity of proposed method decreased by 30% compared with method II. It is suitable for elaborate model of layered manufacturing printing.",
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"content": "This paper introduces an approach for slicing thickness adaptively based on cloud point that aims at the problem of a large amount of data, inefficiency and low precision of 3D printing. The proposed method can select the optimum slicing thickness adaptively based on error analysis of point cloud belt in unified slicing direction by adopting the optimizing quadtree structure of point cloud to store point cloud data. In view of the different complexity model to evaluate the experiment. The result demonstrates that the computational complexity of proposed method decreased by 30% compared with method II. It is suitable for elaborate model of layered manufacturing printing.",
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