id stringlengths 9 16 | title stringlengths 4 278 | categories listlengths 1 13 | abstract stringlengths 3 4.08k | filtered_category_membership dict |
|---|---|---|---|---|
0707.0978 | When Network Coding and Dirty Paper Coding meet in a Cooperative Ad Hoc
Network | [
"cs.IT",
"math.IT"
] | We develop and analyze new cooperative strategies for ad hoc networks that are more spectrally efficient than classical DF cooperative protocols. Using analog network coding, our strategies preserve the practical half-duplex assumption but relax the orthogonality constraint. The introduction of interference due to non-... | {
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0707.1008 | On Cognitive Interference Networks | [
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] | We study the high-power asymptotic behavior of the sum-rate capacity of multi-user interference networks with an equal number of transmitters and receivers. We assume that each transmitter is cognizant of the message it wishes to convey to its corresponding receiver and also of the messages that a subset of the other t... | {
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0707.1025 | The star trellis decoding of Reed-Solomon codes | [
"cs.IT",
"math.IT"
] | The new method for Reed-Solomon codes decoding is introduced. The method is based on the star trellis decoding of the binary image of Reed-Solomon codes. | {
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0707.1063 | High-resolution distributed sampling of bandlimited fields with
low-precision sensors | [
"cs.IT",
"math.IT"
] | The problem of sampling a discrete-time sequence of spatially bandlimited fields with a bounded dynamic range, in a distributed, communication-constrained, processing environment is addressed. A central unit, having access to the data gathered by a dense network of fixed-precision sensors, operating under stringent int... | {
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0707.1064 | The Effect of Noise Correlation in AF Relay Networks | [
"cs.IT",
"math.IT"
] | In wireless relay networks, noise at the relays can be correlated possibly due to common interference or noise propagation from preceding hops. In this work we consider a parallel relay network with noise correlation. For the relay strategy of amplify-and-forward (AF), we determine the optimal rate maximizing relay gai... | {
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0707.1083 | Delayed Correlations in Inter-Domain Network Traffic | [
"cs.NI",
"cs.IR"
] | To observe the evolution of network traffic correlations we analyze the eigenvalue spectra and eigenvectors statistics of delayed correlation matrices of network traffic counts time series. Delayed correlation matrix D is composed of the correlations between one variable in the multivariable time series and another at ... | {
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0707.1099 | Worst-Case Interactive Communication and Enhancing Sensor Network
Lifetime | [
"cs.IT",
"math.IT"
] | We are concerned with the problem of maximizing the worst-case lifetime of a data-gathering wireless sensor network consisting of a set of sensor nodes directly communicating with a base-station.We propose to solve this problem by modeling sensor node and base-station communication as the interactive communication betw... | {
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0707.1193 | Singular curves and cusp points in the joint space of 3-RPR parallel
manipulators | [
"cs.RO"
] | This paper investigates the singular curves in two-dimensional slices of the joint space of a family of planar parallel manipulators. It focuses on special points, referred to as cusp points, which may appear on these curves. Cusp points play an important role in the kinematic behavior of parallel manipulators since th... | {
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0707.1241 | Graph-Based Decoding in the Presence of ISI | [
"cs.IT",
"math.IT"
] | We propose an approximation of maximum-likelihood detection in ISI channels based on linear programming or message passing. We convert the detection problem into a binary decoding problem, which can be easily combined with LDPC decoding. We show that, for a certain class of channels and in the absence of coding, the pr... | {
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0707.1288 | Espaces de repr\'esentation multidimensionnels d\'edi\'es \`a la
visualisation | [
"cs.DB"
] | In decision-support systems, the visual component is important for On Line Analysis Processing (OLAP). In this paper, we propose a new approach that faces the visualization problem due to data sparsity. We use the results of a Multiple Correspondence Analysis (MCA) to reduce the negative effect of sparsity by organizin... | {
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0707.1295 | Efficient supervised learning in networks with binary synapses | [
"q-bio.NC",
"cond-mat.stat-mech",
"cs.NE",
"q-bio.QM"
] | Recent experimental studies indicate that synaptic changes induced by neuronal activity are discrete jumps between a small number of stable states. Learning in systems with discrete synapses is known to be a computationally hard problem. Here, we study a neurobiologically plausible on-line learning algorithm that deriv... | {
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0707.1304 | Un index de jointure pour les entrep\^ots de donn\'ees XML | [
"cs.DB"
] | XML data warehouses form an interesting basis for decision-support applications that exploit heterogeneous data from multiple sources. However, XML-native database systems currently bear limited performances and it is necessary to research ways to optimize them. In this paper, we propose a new index that is specificall... | {
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0707.1306 | S\'election simultan\'ee d'index et de vues mat\'erialis\'ees | [
"cs.DB"
] | Indices and materialized views are physical structures that accelerate data access in data warehouses. However, these data structures generate some maintenance overhead. They also share the same storage space. The existing studies about index and materialized view selection consider these structures separately. In this... | {
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0707.1452 | Clusters, Graphs, and Networks for Analysing Internet-Web-Supported
Communication within a Virtual Community | [
"cs.AI",
"cs.LG"
] | The proposal is to use clusters, graphs and networks as models in order to analyse the Web structure. Clusters, graphs and networks provide knowledge representation and organization. Clusters were generated by co-site analysis. The sample is a set of academic Web sites from the countries belonging to the European Union... | {
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0707.1470 | Secrecy Capacity Region of Fading Broadcast Channels | [
"cs.IT",
"math.IT"
] | The fading broadcast channel with confidential messages (BCC) is investigated, where a source node has common information for two receivers (receivers 1 and 2), and has confidential information intended only for receiver 1. The confidential information needs to be kept as secret as possible from receiver 2. The channel... | {
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0707.1534 | An Architecture Framework for Complex Data Warehouses | [
"cs.DB"
] | Nowadays, many decision support applications need to exploit data that are not only numerical or symbolic, but also multimedia, multistructure, multisource, multimodal, and/or multiversion. We term such data complex data. Managing and analyzing complex data involves a lot of different issues regarding their structure, ... | {
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0707.1548 | Data Mining-based Materialized View and Index Selection in Data
Warehouses | [
"cs.DB"
] | Materialized views and indexes are physical structures for accelerating data access that are casually used in data warehouses. However, these data structures generate some maintenance overhead. They also share the same storage space. Most existing studies about materialized view and index selection consider these struc... | {
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0707.1558 | Autonomy with regard to an Attribute | [
"cs.MA"
] | This paper presents a model of autonomy called autonomy with regard to an attribute applicable to cognitive and not cognitive artificial agents. Three criteria (global / partial, social / nonsocial, absolute / relative) are defined and used to describe the main characteristics of this type of autonomy. A software agent... | {
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0707.1588 | A Tight Lower Bound to the Outage Probability of Discrete-Input
Block-Fading Channels | [
"cs.IT",
"math.IT"
] | In this correspondence, we propose a tight lower bound to the outage probability of discrete-input Nakagami-m block-fading channels. The approach permits an efficient method for numerical evaluation of the bound, providing an additional tool for system design. The optimal rate-diversity trade-off for the Nakagami-m blo... | {
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0707.1644 | Fast and Simple Relational Processing of Uncertain Data | [
"cs.DB",
"cs.PF"
] | This paper introduces U-relations, a succinct and purely relational representation system for uncertain databases. U-relations support attribute-level uncertainty using vertical partitioning. If we consider positive relational algebra extended by an operation for computing possible answers, a query on the logical level... | {
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0707.1739 | On slow-fading non-separable correlation MIMO systems | [
"cs.IT",
"math.IT"
] | In a frequency selective slow-fading channel in a MIMO system, the channel matrix is of the form of a block matrix. We propose a method to calculate the limit of the eigenvalue distribution of block matrices if the size of the blocks tends to infinity. We will also calculate the asymptotic eigenvalue distribution of $H... | {
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0707.1824 | The Kinematics of Manipulators Built From Closed Planar Mechanisms | [
"cs.RO"
] | The paper discusses the kinematics of manipulators builts of planar closed kinematic chains. A special kinematic scheme is extracted from the array of these mechanisms that looks the most promising for the creation of different types of robotic manipulators. The structural features of this manipulator determine a numbe... | {
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0707.1859 | On the Degrees of Freedom in Cognitive Radio Channels | [
"cs.IT",
"math.IT"
] | After receiving useful peer comments, we would like to withdraw this paper. | {
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0707.1912 | Throughput Scaling Laws for Wireless Networks with Fading Channels | [
"cs.IT",
"math.IT"
] | A network of n communication links, operating over a shared wireless channel, is considered. Fading is assumed to be the dominant factor affecting the strength of the channels between transmitter and receiver terminals. It is assumed that each link can be active and transmit with a constant power P or remain silent. Th... | {
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0707.1913 | Removing Manually-Generated Boilerplate from Electronic Texts:
Experiments with Project Gutenberg e-Books | [
"cs.DL",
"cs.CL"
] | Collaborative work on unstructured or semi-structured documents, such as in literature corpora or source code, often involves agreed upon templates containing metadata. These templates are not consistent across users and over time. Rule-based parsing of these templates is expensive to maintain and tends to fail as new ... | {
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0707.1957 | Moveability and Collision Analysis for Fully-Parallel Manipulators | [
"cs.RO"
] | The aim of this paper is to characterize the moveability of fully-parallel manipulators in the presence of obstacles. Fully parallel manipulators are used in applications where accuracy, stiffness or high speeds and accelerations are required \cite{Merlet:97}. However, one of its main drawbacks is a relatively small wo... | {
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0707.2006 | Working Modes and Aspects in Fully-Parallel Manipulator | [
"cs.RO"
] | The aim of this paper is to characterize the notion of aspect in the workspace and in the joint space for parallel manipulators. In opposite to the serial manipulators, the parallel manipulators can admit not only multiple inverse kinematic solutions, but also multiple direct kinematic solutions. The notion of aspect i... | {
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0707.2014 | On the error exponent of variable-length block-coding schemes over
finite-state Markov channels with feedback | [
"cs.IT",
"math.IT"
] | The error exponent of Markov channels with feedback is studied in the variable-length block-coding setting. Burnashev's classic result is extended and a single letter characterization for the reliability function of finite-state Markov channels is presented, under the assumption that the channel state is causally obser... | {
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0707.2017 | The Isoconditioning Loci of A Class of Closed-Chain Manipulators | [
"cs.RO"
] | The subject of this paper is a special class of closed-chain manipulators. First, we analyze a family of two-degree-of-freedom (dof) five-bar planar linkages. Two Jacobian matrices appear in the kinematic relations between the joint-rate and the Cartesian-velocity vectors, which are called the ``inverse kinematics" and... | {
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0707.2027 | Workspace and Assembly modes in Fully-Parallel Manipulators : A
Descriptive Study | [
"cs.RO"
] | The goal of this paper is to explain, using a typical example, the distribution of the different assembly modes in the workspace and their effective role in the execution of trajectories. The singular and non-singular changes of assembly mode are described and compared to each other. The non-singular change of assembly... | {
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0707.2034 | Conception Isotropique D'Une Morphologie Parall\`Ele : Application \`a
L'Usinage | [
"cs.RO"
] | The aim of this paper is the isotropic design of a hybrid morphology dedicated to 3-axis machining applications. It is necessary to ensure the feasibility of continuous, singularity-free trajectories, as well as a good manipulability in position and velocity. We want to propose an alternative design to conventional ser... | {
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0707.2042 | A distributed Approach for Access and Visibility Task under Ergonomic
Constraints with a Manikin in a Virtual Reality Environment | [
"cs.RO"
] | This paper presents a new method, based on a multi-agent system and on digital mock-up technology, to assess an efficient path planner for a manikin for access and visibility task under ergonomic constraints. In order to solve this problem, the human operator is integrated in the process optimization to contribute to a... | {
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0707.2090 | A Training based Distributed Non-Coherent Space-Time Coding Strategy | [
"cs.IT",
"math.IT"
] | Unitary space-time modulation is known to be an efficient means to communicate over non-coherent Multiple Input Multiple Output (MIMO) channels. In this letter, differential unitary space-time coding and non-coherent space-time coding for the training based approach of Kim and Tarokh are addressed. For this approach, n... | {
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0707.2176 | Benefit of Delay on the Diversity-Multiplexing Tradeoffs of MIMO
Channels with Partial CSI | [
"cs.IT",
"math.IT"
] | This paper re-examines the well-known fundamental tradeoffs between rate and reliability for the multi-antenna, block Rayleigh fading channel in the high signal to noise ratio (SNR) regime when (i) the transmitter has access to (noiseless) one bit per coherence-interval of causal channel state information (CSI) and (ii... | {
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0707.2185 | Mod\'elisation Dynamique d'un Robot Parall\`ele \`a 3-DDL : l'Orthoglide | [
"cs.RO"
] | In this article, we propose a method for calculation of the inverse and direct dynamic models of the Orthoglide, a parallel robot with threedegrees of freedom in translation. These models are calculated starting from the elements of the dynamic model of the kinematic chain structure and equations of Newton-Euler applie... | {
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0707.2191 | Word statistics in Blogs and RSS feeds: Towards empirical universal
evidence | [
"cs.IT",
"math.IT"
] | We focus on the statistics of word occurrences and of the waiting times between such occurrences in Blogs. Due to the heterogeneity of words' frequencies, the empirical analysis is performed by studying classes of "frequently-equivalent" words, i.e. by grouping words depending on their frequencies. Two limiting cases a... | {
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0707.2227 | Degeneracy study of the forward kinematics of planar 3-RPR parallel
manipulators | [
"cs.RO"
] | This paper investigates two situations in which the forward kinematics of planar 3-RPR parallel manipulators degenerates. These situations have not been addressed before. The first degeneracy arises when the three input joint variables r1, r2 and r3 satisfy a certain relationship. This degeneracy yields a double root o... | {
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0707.2228 | Kinematic Analysis of a Family of 3R Manipulators | [
"cs.RO"
] | The workspace topologies of a family of 3-revolute (3R) positioning manipulators are enumerated. The workspace is characterized in a half-cross section by the singular curves. The workspace topology is defined by the number of cusps that appear on these singular curves. The design parameters space is shown to be divide... | {
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0707.2229 | The Computation of All 4R Serial Spherical Wrists With an Isotropic
Architecture | [
"cs.RO"
] | A spherical wrist of the serial type with n revolute (R) joints is said to be isotropic if it can attain a posture whereby the singular values of its Jacobian matrix are all equal to sqrt(n/3). What isotropy brings about is robustness to manufacturing, assembly, and measurement errors, thereby guaranteeing a maximum or... | {
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0707.2238 | A design oriented study for 3R Orthogonal Manipulators With Geometric
Simplifications | [
"cs.RO"
] | This paper proposes a method to calculate the largest Regular Dextrous Workspace (RDW) of some types of three-revolute orthogonal manipulators that have at least one of their DH parameters equal to zero. Then a new performance index based on the RDW is introduced, the isocontours of this index are plotted in the parame... | {
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0707.2265 | Separable convex optimization problems with linear ascending constraints | [
"cs.IT",
"math.IT",
"math.OC"
] | Separable convex optimization problems with linear ascending inequality and equality constraints are addressed in this paper. Under an ordering condition on the slopes of the functions at the origin, an algorithm that determines the optimum point in a finite number of steps is described. The optimum value is shown to b... | {
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0707.2270 | Design of a Spherical Wrist with Parallel Architecture: Application to
Vertebrae of an Eel Robot | [
"cs.RO"
] | The design of a spherical wrist with parallel architecture is the object of this article. This study is part of a larger project, which aims to design and to build an eel robot for inspection of immersed piping. The kinematic analysis of the mechanism is presented first to characterize the singular configurations as we... | {
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0707.2275 | Passive Control Architecture for Virtual Humans | [
"cs.RO"
] | In the present paper, we introduce a new control architecture aimed at driving virtual humans in interaction with virtual environments, by motion capture. It brings decoupling of functionalities, and also of stability thanks to passivity. We show projections can break passivity, and thus must be used carefully. Our con... | {
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0707.2376 | Tripartitions do not always discriminate phylogenetic networks | [
"q-bio.PE",
"cs.CE",
"cs.DM"
] | Phylogenetic networks are a generalization of phylogenetic trees that allow for the representation of non-treelike evolutionary events, like recombination, hybridization, or lateral gene transfer. In a recent series of papers devoted to the study of reconstructibility of phylogenetic networks, Moret, Nakhleh, Warnow an... | {
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0707.2432 | Pricing Asian Options for Jump Diffusions | [
"cs.CE"
] | We construct a sequence of functions that uniformly converge (on compact sets) to the price of Asian option, which is written on a stock whose dynamics follows a jump diffusion, exponentially fast. Each of the element in this sequence solves a parabolic partial differen- tial equation (not an integro-differential equat... | {
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0707.2482 | Multiple-Description Lattice Vector Quantization | [
"cs.IT",
"math.IT"
] | In this thesis, we construct and analyze multiple-description codes based on lattice vector quantization. | {
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0707.2506 | Mixed Integer Linear Programming For Exact Finite-Horizon Planning In
Decentralized Pomdps | [
"cs.AI"
] | We consider the problem of finding an n-agent joint-policy for the optimal finite-horizon control of a decentralized Pomdp (Dec-Pomdp). This is a problem of very high complexity (NEXP-hard in n >= 2). In this paper, we propose a new mathematical programming approach for the problem. Our approach is based on two ideas: ... | {
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0707.2527 | Rate and Power Allocation for Discrete-Rate Link Adaptation | [
"cs.IT",
"math.IT"
] | Link adaptation, in particular adaptive coded modulation (ACM), is a promising tool for bandwidth-efficient transmission in a fading environment. The main motivation behind employing ACM schemes is to improve the spectral efficiency of wireless communication systems. In this paper, using a finite number of capacity ach... | {
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0707.2718 | Animation of virtual mannequins, robot-like simulation or motion
captures | [
"cs.RO"
] | In order to optimize the costs and time of design of the new products while improving their quality, concurrent engineering is based on the digital model of these products, the numerical model. However, in order to be able to avoid definitively physical model, old support of the design, without loss of information, new... | {
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0707.2721 | A Framework to Illustrate Kinematic Behavior of Mechanisms by Haptic
Feedback | [
"cs.RO"
] | The kinematic properties of mechanisms are well known by the researchers and teachers. The theory based on the study of Jacobian matrices allows us to explain, for example, the singular configuration. However, in many cases, the physical sense of such properties is difficult to explain to students. The aim of this arti... | {
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0707.2780 | On the ergodic sum-rate performance of CDD in multi-user systems | [
"cs.IT",
"math.IT"
] | The main focus of space-time coding design and analysis for MIMO systems has been so far focused on single-user systems. For single-user systems, transmit diversity schemes suffer a loss in spectral efficiency if the receiver is equipped with more than one antenna, making them unsuitable for high rate transmission. One... | {
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0707.2792 | Distributed Compression and Multiparty Squashed Entanglement | [
"quant-ph",
"cs.IT",
"math.IT"
] | We study a protocol in which many parties use quantum communication to transfer a shared state to a receiver without communicating with each other. This protocol is a multiparty version of the fully quantum Slepian-Wolf protocol for two senders and arises through the repeated application of the two-sender protocol. We ... | {
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0707.2833 | A Comparative Study between Two Three-DOF Parallel Kinematic Machines
using Kinetostatic Criteria and Interval Analysis | [
"cs.RO"
] | This paper addresses the workspace analysis of two 3-DOF translational parallel mechanisms designed for machining applications. The two machines features three fixed linear joints. The joint axes of the first machine are orthogonal whereas these of the second are parallel. In both cases, the mobile platform moves in th... | {
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0707.2836 | Multimedia Capacity Analysis of the IEEE 802.11e Contention-based
Infrastructure Basic Service Set | [
"cs.IT",
"cs.MM",
"math.IT"
] | We first propose a simple mathematical analysis framework for the Enhanced Distributed Channel Access (EDCA) function of the recently ratified IEEE 802.11e standard. Our analysis considers the fact that the distributed random access systems exhibit cyclic behavior. The proposed model is valid for arbitrary assignments ... | {
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0707.2841 | The Virtual Manufacturing concept: Scope, Socio-Economic Aspects and
Future Trends | [
"cs.RO"
] | The research area "Virtual Manufacturing (VM)'' is the use of information technology and computer simulation to model real world manufacturing processes for the purpose of analysing and understanding them. As automation technologies such as CAD/CAM have substantially shortened the time required to design products, Virt... | {
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0707.2842 | A Classification of 3R Orthogonal Manipulators by the Topology of their
Workspace | [
"cs.RO"
] | A classification of a family of 3-revolute (3R) positining manipulators is established. This classification is based on the topology of their workspace. The workspace is characterized in a half-cross section by the singular curves. The workspace topology is defined by the number of cusps and nodes that appear on these ... | {
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0707.2926 | Robust Hypothesis Testing with a Relative Entropy Tolerance | [
"cs.IT",
"math.IT"
] | This paper considers the design of a minimax test for two hypotheses where the actual probability densities of the observations are located in neighborhoods obtained by placing a bound on the relative entropy between actual and nominal densities. The minimax problem admits a saddle point which is characterized. The rob... | {
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0707.2998 | Building a Cooperative Communications System | [
"cs.IT",
"math.IT"
] | In this paper, we present the results from over-the-air experiments of a complete implementation of an amplify and forward cooperative communications system. Our custom OFDM-based physical layer uses a distributed version of the Alamouti block code, where the relay sends one branch of Alamouti encoded symbols. First we... | {
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0707.3030 | Optimal Design of Ad Hoc Injection Networks by Using Genetic Algorithms | [
"cs.NE",
"cs.AI",
"cs.NI"
] | This work aims at optimizing injection networks, which consist in adding a set of long-range links (called bypass links) in mobile multi-hop ad hoc networks so as to improve connectivity and overcome network partitioning. To this end, we rely on small-world network properties, that comprise a high clustering coefficien... | {
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0707.3043 | p-Adic Modelling of the Genome and the Genetic Code | [
"q-bio.OT",
"cs.IT",
"math.IT",
"physics.bio-ph"
] | The present paper is devoted to foundations of p-adic modelling in genomics. Considering nucleotides, codons, DNA and RNA sequences, amino acids, and proteins as information systems, we have formulated the corresponding p-adic formalisms for their investigations. Each of these systems has its characteristic prime numbe... | {
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0707.3087 | Universal Reinforcement Learning | [
"cs.IT",
"cs.LG",
"math.IT"
] | We consider an agent interacting with an unmodeled environment. At each time, the agent makes an observation, takes an action, and incurs a cost. Its actions can influence future observations and costs. The goal is to minimize the long-term average cost. We propose a novel algorithm, known as the active LZ algorithm, f... | {
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0707.3095 | Channel Capacity Estimation using Free Probability Theory | [
"cs.IT",
"math.IT"
] | In many channel measurement applications, one needs to estimate some characteristics of the channels based on a limited set of measurements. This is mainly due to the highly time varying characteristics of the channel. In this contribution, it will be shown how free probability can be used for channel capacity estimati... | {
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0707.3175 | Stacked OSTBC: Error Performance and Rate Analysis | [
"cs.IT",
"math.IT"
] | It is well known, that the Alamouti scheme is the only space-time code from orthogonal design achieving the capacity of a multiple-input multiple-output (MIMO) wireless communication system with n_T=2 transmit antennas and n_R=1 receive antenna. In this work, we propose the n-times stacked Alamouti scheme for n_T=2n tr... | {
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0707.3186 | Kinematic and stiffness analysis of the Orthoglide, a PKM with simple,
regular workspace and homogeneous performances | [
"cs.RO"
] | The Orthoglide is a Delta-type PKM dedicated to 3-axis rapid machining applications that was originally developed at IRCCyN in 2000-2001 to meet the advantages of both serial 3-axis machines (regular workspace and homogeneous performances) and parallel kinematic architectures (good dynamic performances and stiffness). ... | {
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0707.3205 | Neutrality and Many-Valued Logics | [
"cs.LO",
"cs.AI"
] | In this book, we consider various many-valued logics: standard, linear, hyperbolic, parabolic, non-Archimedean, p-adic, interval, neutrosophic, etc. We survey also results which show the tree different proof-theoretic frameworks for many-valued logics, e.g. frameworks of the following deductive calculi: Hilbert's style... | {
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0707.3248 | Decentralized sequential change detection using physical layer fusion | [
"cs.IT",
"math.IT"
] | The problem of decentralized sequential detection with conditionally independent observations is studied. The sensors form a star topology with a central node called fusion center as the hub. The sensors make noisy observations of a parameter that changes from an initial state to a final state at a random time where th... | {
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0707.3263 | Autonomous tools for Grid management, monitoring and optimization | [
"cs.DC",
"cs.CE",
"hep-ex"
] | We outline design and lines of development of autonomous tools for the computing Grid management, monitoring and optimization. The management is proposed to be based on the notion of utility. Grid optimization is considered to be application-oriented. A generic Grid simulator is proposed as an optimization tool for Gri... | {
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0707.3269 | International Standard for a Linguistic Annotation Framework | [
"cs.CL"
] | This paper describes the Linguistic Annotation Framework under development within ISO TC37 SC4 WG1. The Linguistic Annotation Framework is intended to serve as a basis for harmonizing existing language resources as well as developing new ones. | {
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0707.3270 | A Formal Model of Dictionary Structure and Content | [
"cs.CL"
] | We show that a general model of lexical information conforms to an abstract model that reflects the hierarchy of information found in a typical dictionary entry. We show that this model can be mapped into a well-formed XML document, and how the XSL transformation language can be used to implement a semantics defined ov... | {
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0707.3336 | Statistical mechanical analysis of the linear vector channel in digital
communication | [
"cs.IT",
"cond-mat.dis-nn",
"cond-mat.stat-mech",
"math.IT"
] | A statistical mechanical framework to analyze linear vector channel models in digital wireless communication is proposed for a large system. The framework is a generalization of that proposed for code-division multiple-access systems in Europhys. Lett. 76 (2006) 1193 and enables the analysis of the system in which the ... | {
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0707.3390 | Consistency of the group Lasso and multiple kernel learning | [
"cs.LG"
] | We consider the least-square regression problem with regularization by a block 1-norm, i.e., a sum of Euclidean norms over spaces of dimensions larger than one. This problem, referred to as the group Lasso, extends the usual regularization by the 1-norm where all spaces have dimension one, where it is commonly referred... | {
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0707.3409 | Faster exon assembly by sparse spliced alignment | [
"cs.DS",
"cs.CC",
"cs.CE",
"q-bio.QM"
] | Assembling a gene from candidate exons is an important problem in computational biology. Among the most successful approaches to this problem is \emph{spliced alignment}, proposed by Gelfand et al., which scores different candidate exon chains within a DNA sequence of length $m$ by comparing them to a known related gen... | {
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0707.3457 | A Generalized Information Formula as the Bridge between Shannon and
Popper | [
"cs.IT",
"cs.AI",
"math.IT"
] | A generalized information formula related to logical probability and fuzzy set is deduced from the classical information formula. The new information measure accords with to Popper's criterion for knowledge evolution very much. In comparison with square error criterion, the information criterion does not only reflect e... | {
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0707.3461 | Lattices for Distributed Source Coding: Jointly Gaussian Sources and
Reconstruction of a Linear Function | [
"cs.IT",
"math.IT"
] | Consider a pair of correlated Gaussian sources (X1,X2). Two separate encoders observe the two components and communicate compressed versions of their observations to a common decoder. The decoder is interested in reconstructing a linear combination of X1 and X2 to within a mean-square distortion of D. We obtain an inne... | {
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0707.3479 | Quantum Algorithms for Learning and Testing Juntas | [
"quant-ph",
"cs.LG"
] | In this article we develop quantum algorithms for learning and testing juntas, i.e. Boolean functions which depend only on an unknown set of k out of n input variables. Our aim is to develop efficient algorithms: - whose sample complexity has no dependence on n, the dimension of the domain the Boolean functions are d... | {
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0707.3482 | A Bayesian Framework for Combining Valuation Estimates | [
"q-fin.ST",
"cs.CE",
"nlin.AO",
"nlin.CD",
"nlin.SI",
"physics.pop-ph",
"physics.soc-ph",
"stat.AP"
] | Obtaining more accurate equity value estimates is the starting point for stock selection, value-based indexing in a noisy market, and beating benchmark indices through tactical style rotation. Unfortunately, discounted cash flow, method of comparables, and fundamental analysis typically yield discrepant valuation estim... | {
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0707.3507 | Workspace and Kinematic Analysis of the VERNE machine | [
"cs.RO"
] | This paper describes the workspace and the inverse and direct kinematic analysis of the VERNE machine, a serial/parallel 5-axis machine tool designed by Fatronik for IRCCyN. This machine is composed of a three-degree-of-freedom (DOF) parallel module and a two-DOF serial tilting table. The parallel module consists of a ... | {
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0707.3509 | Upper bound of loss probability in an OFDMA system with randomly located
users | [
"math.PR",
"cs.IT",
"cs.NI",
"math.IT"
] | For OFDMA systems, we find a rough but easily computed upper bound for the probability of loosing communications by insufficient number of sub-channels on downlink. We consider as random the positions of receiving users in the system as well as the number of sub-channels dedicated to each one. We use recent results of ... | {
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0707.3531 | e-Science initiatives in Venezuela | [
"cs.CE",
"cs.DC"
] | Within the context of the nascent e-Science infrastructure in Venezuela, we describe several web-based scientific applications developed at the Centro Nacional de Calculo Cientifico Universidad de Los Andes (CeCalCULA), Merida, and at the Instituto Venezolano de Investigaciones Cientificas (IVIC), Caracas. The differen... | {
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0707.3534 | The Kinetostatic Optimization of a Novel Prismatic Drive | [
"cs.RO"
] | The design of a mechanical transmission taking into account the transmitted forces is reported in this paper. This transmission is based on Slide-o-Cam, a cam mechanism with multiple rollers mounted on a common translating follower. The design of Slide-o-Cam, a transmission intended to produce a sliding motion from a t... | {
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0707.3550 | A Six Degree-Of-Freedom Haptic Device Based On The Orthoglide And A
Hybrid Agile Eye | [
"cs.RO"
] | This paper is devoted to the kinematic design of a new six degree-of-freedom haptic device using two parallel mechanisms. The first one, called orthoglide, provides the translation motions and the second one, called agile eye, produces the rotational motions. These two motions are decoupled to simplify the direct and i... | {
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} |
0707.3552 | Analyse Comparative des Manipulateurs 3R \`a Axes Orthogonaux | [
"cs.RO"
] | A family of 3R orthogonal manipulators without offset on the third body can be divided into exactly nine workspace topologies. The workspace is characterized in a half-cross section by the singular curves. The workspace topology is defined by the number of cusps and nodes that appear on these singular curves. Based on ... | {
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0707.3553 | An Exhaustive Study of the Workspace Topologies of all 3R Orthogonal
Manipulators with Geometric Simplifications | [
"cs.RO"
] | This paper analyses the workspace of the three-revolute orthogonal manipulators that have at least one of their DH parameters equal to zero. These manipulators are classified into different groups with similar kinematic properties. The classification criteria are based on the topology of the workspace. Each group is ev... | {
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0707.3559 | Practical Approach to Knowledge-based Question Answering with Natural
Language Understanding and Advanced Reasoning | [
"cs.CL",
"cs.AI",
"cs.HC",
"cs.IR"
] | This research hypothesized that a practical approach in the form of a solution framework known as Natural Language Understanding and Reasoning for Intelligence (NaLURI), which combines full-discourse natural language understanding, powerful representation formalism capable of exploiting ontological information and reas... | {
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} |
0707.3560 | Integration of a Balanced Virtual Manikin in a Virtual Reality Platform
aimed at Virtual Prototyping | [
"cs.RO"
] | The work presented here is aimed at introducing a virtual human controller in a virtual prototyping framework. After a brief introduction describing the problem solved in the paper, we describe the interest as for digital humans in the context of concurrent engineering. This leads us to draw a control architecture enab... | {
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0707.3562 | Balanced Virtual Humans Interacting with their Environment | [
"cs.RO"
] | The animation of human avatars seems very successful; the computer graphics industry shows outstanding results in films everyday, the game industry achieves exploits... Nevertheless, the animation and control processes of such manikins are very painful. It takes days to a specialist to build such animated sequences, an... | {
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0707.3563 | Virtual reality: A human centered tool for improving Manufacturing | [
"cs.RO"
] | Manufacturing is using Virtual Reality tools to enhance the product life cycle. Their definitions are still in flux and it is necessary to define their connections. Thus, firstly, we will introduce more closely some definitions where we will find that, if the Virtual manufacturing concepts originate from machining oper... | {
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0707.3564 | A New Six Degree-of-Freedom Haptic Device based on the Orthoglide and
the Agile Eye | [
"cs.RO"
] | The aim of this paper is to present a new six degree-of-freedom (dof) haptic device using two parallel mechanisms. The first one, called orthoglide, provides the translation motions and the second one produces the rotational motions. These two motions are decoupled to simplify the direct and inverse kinematics, as it i... | {
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0707.3574 | L'orthoglide : une machine-outil rapide d'architecture parall\`ele
isotrope | [
"cs.RO"
] | This article presents the Orthoglide project. The purpose of this project is the realization of a prototype of machine tool to three degrees of translation. The characteristic of this machine is a parallel kinematic architecture optimized to obtain a compact workspace with homogeneous performance. For that, the princip... | {
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0707.3575 | An exploratory study of Google Scholar | [
"cs.DL",
"cs.IR"
] | The paper discusses and analyzes the scientific search service Google Scholar (GS). The focus is on an exploratory study which investigates the coverage of scientific serials in GS. The study shows deficiencies in the coverage and up-to-dateness of the GS index. Furthermore, the study points up which Web servers are th... | {
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0707.3584 | The effect of fading, channel inversion, and threshold scheduling on ad
hoc networks | [
"cs.IT",
"math.IT"
] | This paper addresses three issues in the field of ad hoc network capacity: the impact of i)channel fading, ii) channel inversion power control, and iii) threshold-based scheduling on capacity. Channel inversion and threshold scheduling may be viewed as simple ways to exploit channel state information (CSI) without requ... | {
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0707.3665 | A Comparative Study of Parallel Kinematic Architectures for Machining
Applications | [
"cs.RO"
] | Parallel kinematic mechanisms are interesting alternative designs for machining applications. Three 2-DOF parallel mechanism architectures dedicated to machining applications are studied in this paper. The three mechanisms have two constant length struts gliding along fixed linear actuated joints with different relativ... | {
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0707.3666 | Kinematic Analysis of a New Parallel Machine Tool: the Orthoglide | [
"cs.RO"
] | This paper describes a new parallel kinematic architecture for machining applications: the orthoglide. This machine features three fixed parallel linear joints which are mounted orthogonally and a mobile platform which moves in the Cartesian x-y-z space with fixed orientation. The main interest of the orthoglide is tha... | {
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0707.3673 | The Computation of All 4R Serial Spherical Wrists With an Isotropic
Architecture | [
"cs.RO"
] | A spherical wrist of the serial type is said to be isotropic if it can attain a posture whereby the singular values of its Jacobian matrix are all identical and nonzero. What isotropy brings about is robustness to manufacturing, assembly, and measurement errors, thereby guaranteeing a maximum orientation accuracy. In t... | {
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} |
0707.3781 | Bijective Faithful Translations among Default Logics | [
"cs.AI",
"cs.LO"
] | In this article, we study translations between variants of defaults logics such that the extensions of the theories that are the input and the output of the translation are in a bijective correspondence. We assume that a translation can introduce new variables and that the result of translating a theory can either be p... | {
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0707.3878 | Plotkin construction: rank and kernel | [
"cs.IT",
"math.IT"
] | Given two binary codes of length n, using Plotkin construction we obtain a code of length 2n. The construction works for linear and nonlinear codes. For the linear case, it is straightforward to see that the dimension of the final code is the sum of the dimensions of the starting codes. For nonlinear codes, the rank an... | {
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0707.3925 | Use of a $d$-Constraint During LDPC Decoding in a Bliss Scheme | [
"cs.IT",
"math.IT"
] | Bliss schemes of a run length limited (RLL) codec in combination with an LDPC codec, generate LDPC parity bits over a systematic sequence of RLL channel bits that are inherently redundant as they satisfy e.g. a $d=1$ minimum run length constraint. That is the subsequences consisting of runs of length $d=1$, viz. $...01... | {
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0707.3959 | Four-Group Decodable Space-Time Block Codes | [
"cs.IT",
"math.IT"
] | Two new rate-one full-diversity space-time block codes (STBC) are proposed. They are characterized by the \emph{lowest decoding complexity} among the known rate-one STBC, arising due to the complete separability of the transmitted symbols into four groups for maximum likelihood detection. The first and the second codes... | {
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} |
0707.3972 | Learning Probabilistic Models of Word Sense Disambiguation | [
"cs.CL",
"cs.AI"
] | This dissertation presents several new methods of supervised and unsupervised learning of word sense disambiguation models. The supervised methods focus on performing model searches through a space of probabilistic models, and the unsupervised methods rely on the use of Gibbs Sampling and the Expectation Maximization (... | {
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0707.3979 | Clifford Algebra of the Vector Space of Conics for decision boundary
Hyperplanes in m-Euclidean Space | [
"cs.NE",
"cs.CG"
] | In this paper we embed $m$-dimensional Euclidean space in the geometric algebra $Cl_m $ to extend the operators of incidence in ${R^m}$ to operators of incidence in the geometric algebra to generalize the notion of separator to a decision boundary hyperconic in the Clifford algebra of hyperconic sections denoted as ${C... | {
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} |
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