id stringlengths 9 16 | title stringlengths 4 278 | categories listlengths 1 13 | abstract stringlengths 3 4.08k | filtered_category_membership dict |
|---|---|---|---|---|
0811.4200 | Two Models for Noisy Feedback in MIMO Channels | [
"cs.IT",
"math.IT"
] | Two distinct models of feedback, suited for FDD (Frequency Division Duplex) and TDD (Frequency Division Duplex) systems respectively, have been widely studied in the literature. In this paper, we compare these two models of feedback in terms of the diversity multiplexing tradeoff for varying amount of channel state inf... | {
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0811.4227 | Entanglement-assisted communication of classical and quantum information | [
"quant-ph",
"cs.IT",
"math.IT"
] | We consider the problem of transmitting classical and quantum information reliably over an entanglement-assisted quantum channel. Our main result is a capacity theorem that gives a three-dimensional achievable rate region. Points in the region are rate triples, consisting of the classical communication rate, the quantu... | {
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0811.4339 | Finite Lattice-Size Effects in MIMO Detection | [
"cs.IT",
"math.IT"
] | Many powerful data detection algorithms employed in multiple-input multiple-output (MIMO) communication systems, such as sphere decoding (SD) and lattice-reduction (LR)-aided detection, were initially designed for infinite lattices. Detection in MIMO systems is, however, based on finite lattices. In this paper, we syst... | {
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0811.4346 | Dynamic Indexability: The Query-Update Tradeoff for One-Dimensional
Range Queries | [
"cs.DS",
"cs.DB"
] | The B-tree is a fundamental secondary index structure that is widely used for answering one-dimensional range reporting queries. Given a set of $N$ keys, a range query can be answered in $O(\log_B \nm + \frac{K}{B})$ I/Os, where $B$ is the disk block size, $K$ the output size, and $M$ the size of the main memory buffer... | {
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0811.4349 | Anti Plagiarism Application with Algorithm Karp-Rabin at Thesis in
Gunadarma University | [
"cs.IT",
"cs.DL",
"math.IT"
] | Plagiarism that is plagiarizing or composition retrieval, opinion, etcetera from other people and makes it is likely composition and opinion him-self. Plagiarism can be considered to be crime because stealing others copyrights. Like action a student copying some part of writings without valid permission from the origin... | {
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0811.4354 | Soft-Input Soft-Output Sphere Decoding | [
"cs.IT",
"math.IT"
] | Soft-input soft-output (SISO) detection algorithms form the basis for iterative decoding. The associated computational complexity often poses significant challenges for practical receiver implementations, in particular in the context of multiple-input multiple-output wireless systems. In this paper, we present a low-co... | {
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0811.4391 | Cross-Layer Link Adaptation Design for Relay Channels with Cooperative
ARQ Protocol | [
"cs.IT",
"math.IT"
] | The cooperative automatic repeat request (C-ARQ) is a link layer relaying protocol which exploits the spatial diversity and allows the relay node to retransmit the source data packet to the destination, when the latter is unable to decode the source data correctly. This paper presents a cross-layer link adaptation desi... | {
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0811.4395 | List Decoding Tensor Products and Interleaved Codes | [
"cs.IT",
"math.IT"
] | We design the first efficient algorithms and prove new combinatorial bounds for list decoding tensor products of codes and interleaved codes. We show that for {\em every} code, the ratio of its list decoding radius to its minimum distance stays unchanged under the tensor product operation (rather than squaring, as one ... | {
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0811.4397 | Joint Adaptive Modulation-Coding and Cooperative ARQ for Wireless Relay
Networks | [
"cs.IT",
"math.IT"
] | This paper presents a cross-layer approach to jointly design adaptive modulation and coding (AMC) at the physical layer and cooperative truncated automatic repeat request (ARQ) protocol at the data link layer. We first derive an exact closed form expression for the spectral efficiency of the proposed joint AMC-cooperat... | {
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0811.4403 | Joint Adaptive Modulation Coding and Cooperative ARQ over Relay
Channels-Applications to Land Mobile Satellite Communications | [
"cs.IT",
"math.IT"
] | In a cooperative relay network, a relay node (R) facilitates data transmission to the destination node (D), when the latter is unable to decode the source node (S) data correctly. This paper considers such a system model and presents a cross-layer approach to jointly design adaptive modulation and coding (AMC) at the p... | {
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0811.4413 | A Spectral Algorithm for Learning Hidden Markov Models | [
"cs.LG",
"cs.AI"
] | Hidden Markov Models (HMMs) are one of the most fundamental and widely used statistical tools for modeling discrete time series. In general, learning HMMs from data is computationally hard (under cryptographic assumptions), and practitioners typically resort to search heuristics which suffer from the usual local optima... | {
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0811.4458 | Learning Class-Level Bayes Nets for Relational Data | [
"cs.LG",
"cs.AI"
] | Many databases store data in relational format, with different types of entities and information about links between the entities. The field of statistical-relational learning (SRL) has developed a number of new statistical models for such data. In this paper we focus on learning class-level or first-order dependencies... | {
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0811.4483 | Wide spread spectrum watermarking with side information and interference
cancellation | [
"cs.MM",
"cs.IT",
"math.IT"
] | Nowadays, a popular method used for additive watermarking is wide spread spectrum. It consists in adding a spread signal into the host document. This signal is obtained by the sum of a set of carrier vectors, which are modulated by the bits to be embedded. To extract these embedded bits, weighted correlations between t... | {
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0811.4489 | Automatic Generation of the Axial Lines of Urban Environments to Capture
What We Perceive | [
"cs.CG",
"cs.CV"
] | Based on the concepts of isovists and medial axes, we developed a set of algorithms that can automatically generate axial lines for representing individual linearly stretched parts of open space of an urban environment. Open space is the space between buildings, where people can freely move around. The generation of th... | {
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0811.4565 | Ergodic Capacity Analysis of Amplify-and-Forward MIMO Dual-Hop Systems | [
"cs.IT",
"math.IT"
] | This paper presents an analytical characterization of the ergodic capacity of amplify-and-forward (AF) MIMO dual-hop relay channels, assuming that the channel state information is available at the destination terminal only. In contrast to prior results, our expressions apply for arbitrary numbers of antennas and arbitr... | {
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0811.4603 | Frozen Footprints | [
"cs.DL",
"cs.IR"
] | Bibliometrics has the ambitious goal of measuring science. To this end, it exploits the way science is disseminated trough scientific publications and the resulting citation network of scientific papers. We survey the main historical contributions to the field, the most interesting bibliometric indicators, and the most... | {
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0811.4630 | Channel State Prediction, Feedback and Scheduling for a Multiuser
MIMO-OFDM Downlink | [
"cs.IT",
"math.IT"
] | We consider the downlink of a MIMO-OFDM wireless systems where the base-station (BS) has M antennas and serves K single-antenna user terminals (UT) with K larger than or equal to M. Users estimate their channel vectors from common downlink pilot symbols and feed back a prediction, which is used by the BS to compute the... | {
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0811.4697 | Informed stego-systems in active warden context: statistical
undetectability and capacity | [
"cs.IT",
"cs.MM",
"math.IT"
] | Several authors have studied stego-systems based on Costa scheme, but just a few ones gave both theoretical and experimental justifications of these schemes performance in an active warden context. We provide in this paper a steganographic and comparative study of three informed stego-systems in active warden context: ... | {
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0811.4699 | Mapping Images with the Coherence Length Diagrams | [
"cs.CV"
] | Statistical pattern recognition methods based on the Coherence Length Diagram (CLD) have been proposed for medical image analyses, such as quantitative characterisation of human skin textures, and for polarized light microscopy of liquid crystal textures. Further investigations are made on image maps originated from su... | {
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0811.4700 | Trellis-coded quantization for public-key steganography | [
"cs.MM",
"cs.IT",
"math.IT"
] | This paper deals with public-key steganography in the presence of a passive warden. The aim is to hide secret messages within cover-documents without making the warden suspicious, and without any preliminar secret key sharing. Whereas a practical attempt has been already done to provide a solution to this problem, it s... | {
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0811.4702 | Information-theoretic resolution of perceptual WSS watermarking of non
i.i.d. Gaussian signals | [
"cs.IT",
"cs.MM",
"math.IT"
] | The theoretical foundations of data hiding have been revealed by formulating the problem as message communication over a noisy channel. We revisit the problem in light of a more general characterization of the watermark channel and of weighted distortion measures. Considering spread spectrum based information hiding, w... | {
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0811.4706 | Comparing Measures of Sparsity | [
"cs.IT",
"math.IT"
] | Sparsity of representations of signals has been shown to be a key concept of fundamental importance in fields such as blind source separation, compression, sampling and signal analysis. The aim of this paper is to compare several commonlyused sparsity measures based on intuitive attributes. Intuitively, a sparse repres... | {
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0811.4717 | Prospective Study for Semantic Inter-Media Fusion in Content-Based
Medical Image Retrieval | [
"cs.IR",
"cs.CL"
] | One important challenge in modern Content-Based Medical Image Retrieval (CBMIR) approaches is represented by the semantic gap, related to the complexity of the medical knowledge. Among the methods that are able to close this gap in CBMIR, the use of medical thesauri/ontologies has interesting perspectives due to the po... | {
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0811.4718 | On the Fourier Spectra of the Infinite Families of Quadratic APN
Functions | [
"cs.IT",
"cs.CR",
"cs.DM",
"math.IT"
] | It is well known that a quadratic function defined on a finite field of odd degree is almost bent (AB) if and only if it is almost perfect nonlinear (APN). For the even degree case there is no apparent relationship between the values in the Fourier spectrum of a function and the APN property. In this article we compute... | {
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0811.4733 | Kinematic Analysis of a Serial - Parallel Machine Tool: the VERNE
machine | [
"cs.RO"
] | The paper derives the inverse and the forward kinematic equations of a serial - parallel 5-axis machine tool: the VERNE machine. 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 moving platform that is connected to a fixed ... | {
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0811.4773 | Two-way source coding with a helper | [
"cs.IT",
"math.IT"
] | Consider the two-way rate-distortion problem in which a helper sends a common limited-rate message to both users based on side information at its disposal. We characterize the region of achievable rates and distortions where a Markov form (Helper)-(User 1)-(User 2) holds. The main insight of the result is that in order... | {
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0812.0038 | Omnidirectional Relay in Wireless Networks | [
"cs.IT",
"math.IT"
] | For wireless networks with multiple sources, an omnidirectional relay scheme is developed, where each node can simultaneously relay different messages in different directions. This is accomplished by the decode-and-forward relay strategy, with each relay binning the multiple messages to be transmitted, in the same spir... | {
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0812.0070 | An Integrated Software-based Solution for Modular and Self-independent
Networked Robot | [
"cs.RO"
] | An integrated software-based solution for a modular and self-independent networked robot is introduced. The wirelessly operatable robot has been developed mainly for autonomous monitoring works with full control over web. The integrated software solution covers three components : a) the digital signal processing unit f... | {
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0812.0319 | Secrecy Capacity of a Class of Broadcast Channels with an Eavesdropper | [
"cs.IT",
"math.IT"
] | We study the security of communication between a single transmitter and multiple receivers in a broadcast channel in the presence of an eavesdropper. We consider several special classes of channels. As the first model, we consider the degraded multi-receiver wiretap channel where the legitimate receivers exhibit a degr... | {
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0812.0329 | Block-Sparsity: Coherence and Efficient Recovery | [
"cs.IT",
"math.IT"
] | We consider compressed sensing of block-sparse signals, i.e., sparse signals that have nonzero coefficients occuring in clusters. Based on an uncertainty relation for block-sparse signals, we define a block-coherence measure and we show that a block-version of the orthogonal matching pursuit algorithm recovers block k-... | {
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0812.0340 | A Matlab Implementation of a Flat Norm Motivated Polygonal Edge Matching
Method using a Decomposition of Boundary into Four 1-Dimensional Currents | [
"cs.CV",
"cs.CG"
] | We describe and provide code and examples for a polygonal edge matching method. | {
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0812.0382 | k-means requires exponentially many iterations even in the plane | [
"cs.CG",
"cs.DS",
"cs.LG"
] | The k-means algorithm is a well-known method for partitioning n points that lie in the d-dimensional space into k clusters. Its main features are simplicity and speed in practice. Theoretically, however, the best known upper bound on its running time (i.e. O(n^{kd})) can be exponential in the number of points. Recently... | {
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0812.0389 | Approximation Algorithms for Bregman Co-clustering and Tensor Clustering | [
"cs.DS",
"cs.LG"
] | In the past few years powerful generalizations to the Euclidean k-means problem have been made, such as Bregman clustering [7], co-clustering (i.e., simultaneous clustering of rows and columns of an input matrix) [9,18], and tensor clustering [8,34]. Like k-means, these more general problems also suffer from the NP-har... | {
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0812.0438 | An Introduction to Knowledge Management | [
"cs.DB",
"cs.CR"
] | Knowledge has been lately recognized as one of the most important assets of organizations. Managing knowledge has grown to be imperative for the success of a company. This paper presents an overview of Knowledge Management and various aspects of secure knowledge management. A case study of knowledge management activiti... | {
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0812.0564 | Provenance Traces | [
"cs.PL",
"cs.DB"
] | Provenance is information about the origin, derivation, ownership, or history of an object. It has recently been studied extensively in scientific databases and other settings due to its importance in helping scientists judge data validity, quality and integrity. However, most models of provenance have been stated as a... | {
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0812.0617 | The Capacity Region of the Cognitive Z-interference Channel with One
Noiseless Component | [
"cs.IT",
"math.IT"
] | We study the discrete memoryless Z-interference channel (ZIC) where the transmitter of the pair that suffers from interference is cognitive. We first provide upper and lower bounds on the capacity of this channel. We then show that, when the channel of the transmitter-receiver pair that does not face interference is no... | {
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0812.0621 | Channel Estimation and Linear Precoding in Multiuser Multiple-Antenna
TDD Systems | [
"cs.IT",
"math.IT"
] | Traditional approaches in the analysis of downlink systems decouple the precoding and the channel estimation problems. However, in cellular systems with mobile users, these two problems are in fact tightly coupled. In this paper, this coupling is explicitly studied by accounting for channel training overhead and estima... | {
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0812.0659 | Probabilistic reasoning with answer sets | [
"cs.AI",
"cs.LO"
] | This paper develops a declarative language, P-log, that combines logical and probabilistic arguments in its reasoning. Answer Set Prolog is used as the logical foundation, while causal Bayes nets serve as a probabilistic foundation. We give several non-trivial examples and illustrate the use of P-log for knowledge repr... | {
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0812.0698 | Emergent Community Structure in Social Tagging Systems | [
"cs.IR",
"cs.CY",
"cs.HC"
] | A distributed classification paradigm known as collaborative tagging has been widely adopted in new Web applications designed to manage and share online resources. Users of these applications organize resources (Web pages, digital photographs, academic papers) by associating with them freely chosen text labels, or tags... | {
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0812.0743 | A Novel Clustering Algorithm Based on Quantum Games | [
"cs.LG",
"cs.AI",
"cs.CV",
"cs.GT",
"cs.MA",
"cs.NE",
"quant-ph"
] | Enormous successes have been made by quantum algorithms during the last decade. In this paper, we combine the quantum game with the problem of data clustering, and then develop a quantum-game-based clustering algorithm, in which data points in a dataset are considered as players who can make decisions and implement qua... | {
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0812.0759 | A new Contrast Based Image Fusion using Wavelet Packets | [
"cs.IT",
"cs.MM",
"math.IT"
] | Image Fusion, a technique which combines complimentary information from different images of the same scene so that the fused image is more suitable for segmentation, feature extraction, object recognition and Human Visual System. In this paper, a simple yet efficient algorithm is presented based on contrast using wavel... | {
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0812.0790 | Justifications for Logic Programs under Answer Set Semantics | [
"cs.AI",
"cs.PL"
] | The paper introduces the notion of off-line justification for Answer Set Programming (ASP). Justifications provide a graph-based explanation of the truth value of an atom w.r.t. a given answer set. The paper extends also this notion to provide justification of atoms during the computation of an answer set (on-line just... | {
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0812.0874 | Stroke Fragmentation based on Geometry Features and HMM | [
"cs.HC",
"cs.CV"
] | Stroke fragmentation is one of the key steps in pen-based interaction. In this letter, we present a unified HMM-based stroke fragmentation technique that can do segment point location and primitive type determination simultaneously. The geometry features included are used to evaluate local features, and the HMM model i... | {
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0812.0882 | Elagage d'un perceptron multicouches : utilisation de l'analyse de la
variance de la sensibilit\'e des param\`etres | [
"cs.NE"
] | The stucture determination of a neural network for the modelisation of a system remain the core of the problem. Within this framework, we propose a pruning algorithm of the network based on the use of the analysis of the sensitivity of the variance of all the parameters of the network. This algorithm will be tested on ... | {
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0812.0885 | Elementary epistemological features of machine intelligence | [
"cs.AI"
] | Theoretical analysis of machine intelligence (MI) is useful for defining a common platform in both theoretical and applied artificial intelligence (AI). The goal of this paper is to set canonical definitions that can assist pragmatic research in both strong and weak AI. Described epistemological features of machine int... | {
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0812.0933 | Decision trees are PAC-learnable from most product distributions: a
smoothed analysis | [
"cs.LG",
"cs.CC"
] | We consider the problem of PAC-learning decision trees, i.e., learning a decision tree over the n-dimensional hypercube from independent random labeled examples. Despite significant effort, no polynomial-time algorithm is known for learning polynomial-sized decision trees (even trees of any super-constant size), even w... | {
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0812.0972 | Network Protection Codes: Providing Self-healing in Autonomic Networks
Using Network Coding | [
"cs.NI",
"cs.IT",
"math.IT"
] | Agile recovery from link failures in autonomic communication networks is essential to increase robustness, accessibility, and reliability of data transmission. However, this must be done with the least amount of protection resources, while using simple management plane functionality. Recently, network coding has been p... | {
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0812.1014 | Adaptive Spam Detection Inspired by a Cross-Regulation Model of Immune
Dynamics: A Study of Concept Drift | [
"cs.AI",
"cs.IR",
"nlin.AO"
] | This paper proposes a novel solution to spam detection inspired by a model of the adaptive immune system known as the crossregulation model. We report on the testing of a preliminary algorithm on six e-mail corpora. We also compare our results statically and dynamically with those obtained by the Naive Bayes classifier... | {
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0812.1029 | Uncovering protein interaction in abstracts and text using a novel
linear model and word proximity networks | [
"cs.IR",
"cs.LG"
] | We participated in three of the protein-protein interaction subtasks of the Second BioCreative Challenge: classification of abstracts relevant for protein-protein interaction (IAS), discovery of protein pairs (IPS) and text passages characterizing protein interaction (ISS) in full text documents. We approached the abst... | {
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0812.1091 | Communicating the Difference of Correlated Gaussian Sources Over a MAC | [
"cs.IT",
"math.IT"
] | This paper considers the problem of transmitting the difference of two jointly Gaussian sources over a two-user additive Gaussian noise multiple access channel (MAC). The goal is to recover this difference within an average mean squared error distortion criterion. Each transmitter has access to only one of the two Gaus... | {
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0812.1094 | S\'election de la structure d'un perceptron multicouches pour la
r\'eduction dun mod\`ele de simulation d'une scierie | [
"cs.NE"
] | Simulation is often used to evaluate the relevance of a Directing Program of Production (PDP) or to evaluate its impact on detailed sc\'enarii of scheduling. Within this framework, we propose to reduce the complexity of a model of simulation by exploiting a multilayer perceptron. A main phase of the modeling of one sys... | {
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0812.1119 | An analysis of a random algorithm for estimating all the matchings | [
"cs.GR",
"cs.AI"
] | Counting the number of all the matchings on a bipartite graph has been transformed into calculating the permanent of a matrix obtained from the extended bipartite graph by Yan Huo, and Rasmussen presents a simple approach (RM) to approximate the permanent, which just yields a critical ratio O($n\omega(n)$) for almost a... | {
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0812.1126 | Emerge-Sort: Converging to Ordered Sequences by Simple Local Operators | [
"cs.AI",
"cs.DS"
] | In this paper we examine sorting on the assumption that we do not know in advance which way to sort a sequence of numbers and we set at work simple local comparison and swap operators whose repeating application ends up in sorted sequences. These are the basic elements of Emerge-Sort, our approach to self-organizing so... | {
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0812.1155 | Complex Agent Networks explaining the HIV epidemic among homosexual men
in Amsterdam | [
"cs.MA",
"q-bio.PE"
] | Simulating the evolution of the Human Immunodeficiency Virus (HIV) epidemic requires a detailed description of the population network, especially for small populations in which individuals can be represented in detail and accuracy. In this paper, we introduce the concept of a Complex Agent Network(CAN) to model the HIV... | {
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0812.1203 | An Efficient Adaptive Distributed Space-Time Coding Scheme for
Cooperative Relaying | [
"cs.IT",
"math.IT"
] | A non-regenerative dual-hop wireless system based on a distributed space-time coding strategy is considered. It is assumed that each relay retransmits an appropriately scaled space-time coded version of its received signal. The main goal of this paper is to investigate a power allocation strategy in relay stations, whi... | {
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0812.1244 | Decomposition Principles and Online Learning in Cross-Layer Optimization
for Delay-Sensitive Applications | [
"cs.MM",
"cs.LG"
] | In this paper, we propose a general cross-layer optimization framework in which we explicitly consider both the heterogeneous and dynamically changing characteristics of delay-sensitive applications and the underlying time-varying network conditions. We consider both the independently decodable data units (DUs, e.g. pa... | {
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0812.1340 | Obtaining Depth Maps From Color Images By Region Based Stereo Matching
Algorithms | [
"cs.CV"
] | In the paper, region based stereo matching algorithms are developed for extraction depth information from two color stereo image pair. A filter eliminating unreliable disparity estimation was used for increasing reliability of the disparity map. Obtained results by algorithms were represented and compared. | {
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0812.1357 | A Novel Clustering Algorithm Based on Quantum Random Walk | [
"cs.LG"
] | The enormous successes have been made by quantum algorithms during the last decade. In this paper, we combine the quantum random walk (QRW) with the problem of data clustering, and develop two clustering algorithms based on the one dimensional QRW. Then, the probability distributions on the positions induced by QRW in ... | {
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0812.1394 | Conceptual approach through an annotation process for the representation
and the information contents enhancement in economic intelligence (EI) | [
"cs.IR"
] | In the era of the information society, the impact of the information systems on the economy of material and immaterial is certainly perceptible. With regards to the information resources of an organization, the annotation involved to enrich informational content, to track the intellectual activities on a document and t... | {
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0812.1405 | Cognitive Coexistence between Infrastructure and Ad-hoc Systems | [
"cs.IT",
"math.IT"
] | The rapid proliferation of wireless systems makes interference management more and more important. This paper presents a novel cognitive coexistence framework, which enables an infrastructure system to reduce interference to ad-hoc or peer-to-peer communication links in close proximity. Motivated by the superior resour... | {
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0812.1462 | Logic programs with propositional connectives and aggregates | [
"cs.AI"
] | Answer set programming (ASP) is a logic programming paradigm that can be used to solve complex combinatorial search problems. Aggregates are an ASP construct that plays an important role in many applications. Defining a satisfactory semantics of aggregates turned out to be a difficult problem, and in this paper we prop... | {
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0812.1553 | Analysis of Energy Efficiency in Fading Channels under QoS Constraints | [
"cs.IT",
"math.IT"
] | Energy efficiency in fading channels in the presence of Quality of Service (QoS) constraints is studied. Effective capacity, which provides the maximum arrival rate that a wireless channel can sustain while satisfying statistical QoS constraints, is considered. Spectral efficiency--bit energy tradeoff is analyzed in th... | {
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0812.1554 | Molecular communication: Physically realistic models and achievable
information rates | [
"cs.IT",
"math.IT"
] | Molecular communication is a biologically-inspired method of communication with attractive properties for microscale and nanoscale devices. In molecular communication, messages are transmitted by releasing a pattern of molecules at a transmitter, which propagate through a fluid medium towards a receiver. In this paper,... | {
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0812.1557 | To Cooperate, or Not to Cooperate in Imperfectly-Known Fading Channels | [
"cs.IT",
"math.IT"
] | In this paper, communication over imperfectly-known fading channels with different degrees of cooperation is studied. The three-node relay channel is considered. It is assumed that communication starts with the network training phase in which the receivers estimate the fading coefficients of their respective channels. ... | {
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0812.1558 | Pilot-Symbol-Assisted Communications with Noncausal and Causal Wiener
Filters | [
"cs.IT",
"math.IT"
] | In this paper, pilot-assisted transmission over time-selective flat fading channels is studied. It is assumed that noncausal and causal Wiener filters are employed at the receiver to perform channel estimation with the aid of training symbols sent periodically by the transmitter. For both filters, the variances of esti... | {
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0812.1560 | Achievable Rates and Training Optimization for Fading Relay Channels
with Memory | [
"cs.IT",
"math.IT"
] | In this paper, transmission over time-selective, flat fading relay channels is studied. It is assumed that channel fading coefficients are not known a priori. Transmission takes place in two phases: network training phase and data transmission phase. In the training phase, pilot symbols are sent and the receivers emplo... | {
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0812.1597 | Transmission Techniques for Relay-Interference Networks | [
"cs.IT",
"math.IT"
] | In this paper we study the relay-interference wireless network, in which relay (helper) nodes are to facilitate competing information flows over a wireless network. We examine this in the context of a deterministic wireless interaction model, which eliminates the channel noise and focuses on the signal interactions. Us... | {
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0812.1599 | Multi-Agent Reinforcement Learning and Genetic Policy Sharing | [
"cs.MA",
"cs.AI"
] | The effects of policy sharing between agents in a multi-agent dynamical system has not been studied extensively. I simulate a system of agents optimizing the same task using reinforcement learning, to study the effects of different population densities and policy sharing. I demonstrate that sharing policies decreases t... | {
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0812.1629 | An application of the O'Nan-Scott theorem to the group generated by the
round functions of an AES-like cipher | [
"math.GR",
"cs.IT",
"math.IT"
] | In a previous paper, we had proved that the permutation group generated by the round functions of an AES-like cipher is primitive. Here we apply the O'Nan Scott classification of primitive groups to prove that this group is the alternating group. | {
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0812.1713 | Secret Communication with Feedback | [
"cs.IT",
"math.IT"
] | Secure communication with feedback is studied. An achievability scheme in which the backward channel is used to generate a shared secret key is proposed. The scenario of binary symmetric forward and backward channels is considered, and a combination of the proposed scheme and Maurer's coding scheme is shown to achieve ... | {
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0812.1778 | The Impact of QoS Constraints on the Energy Efficiency of Fixed-Rate
Wireless Transmissions | [
"cs.IT",
"math.IT"
] | Transmission over wireless fading channels under quality of service (QoS) constraints is studied when only the receiver has channel side information. Being unaware of the channel conditions, transmitter is assumed to send the information at a fixed rate. Under these assumptions, a two-state (ON-OFF) transmission model ... | {
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0812.1780 | On the Energy Efficiency of Orthogonal Signaling | [
"cs.IT",
"math.IT"
] | In this paper, transmission over the additive white Gaussian noise (AWGN) channel, and coherent and noncoherent fading channels using M-ary orthogonal frequency-shift keying (FSK) or on-off frequency-shift keying (OOFSK) is considered. The receiver is assumed to perform hard-decision detection. In this setting, energy ... | {
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0812.1811 | Stability of graph communities across time scales | [
"physics.soc-ph",
"cs.IR",
"physics.data-an"
] | The complexity of biological, social and engineering networks makes it desirable to find natural partitions into communities that can act as simplified descriptions and provide insight into the structure and function of the overall system. Although community detection methods abound, there is a lack of consensus on how... | {
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0812.1843 | Identification of parameters underlying emotions and a classification of
emotions | [
"cs.AI"
] | The standard classification of emotions involves categorizing the expression of emotions. In this paper, parameters underlying some emotions are identified and a new classification based on these parameters is suggested. | {
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0812.1857 | Dependence Balance Based Outer Bounds for Gaussian Networks with
Cooperation and Feedback | [
"cs.IT",
"math.IT"
] | We obtain new outer bounds on the capacity regions of the two-user multiple access channel with generalized feedback (MAC-GF) and the two-user interference channel with generalized feedback (IC-GF). These outer bounds are based on the idea of dependence balance which was proposed by Hekstra and Willems [1]. To illustra... | {
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0812.1869 | Convex Sparse Matrix Factorizations | [
"cs.LG"
] | We present a convex formulation of dictionary learning for sparse signal decomposition. Convexity is obtained by replacing the usual explicit upper bound on the dictionary size by a convex rank-reducing term similar to the trace norm. In particular, our formulation introduces an explicit trade-off between size and spar... | {
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0812.2049 | Consensus Answers for Queries over Probabilistic Databases | [
"cs.DB"
] | We address the problem of finding a "best" deterministic query answer to a query over a probabilistic database. For this purpose, we propose the notion of a consensus world (or a consensus answer) which is a deterministic world (answer) that minimizes the expected distance to the possible worlds (answers). This problem... | {
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0812.2195 | Equivalence of SQL Queries in Presence of Embedded Dependencies | [
"cs.DB"
] | We consider the problem of finding equivalent minimal-size reformulations of SQL queries in presence of embedded dependencies [1]. Our focus is on select-project-join (SPJ) queries with equality comparisons, also known as safe conjunctive (CQ) queries, possibly with grouping and aggregation. For SPJ queries, the semant... | {
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0812.2202 | Greedy Signal Recovery Review | [
"math.NA",
"cs.IT",
"math.IT"
] | The two major approaches to sparse recovery are L1-minimization and greedy methods. Recently, Needell and Vershynin developed Regularized Orthogonal Matching Pursuit (ROMP) that has bridged the gap between these two approaches. ROMP is the first stable greedy algorithm providing uniform guarantees. Even more recently... | {
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0812.2275 | Secrecy capacity of a class of orthogonal relay eavesdropper channels | [
"cs.IT",
"math.IT"
] | The secrecy capacity of relay channels with orthogonal components is studied in the presence of an additional passive eavesdropper node. The relay and destination receive signals from the source on two orthogonal channels such that the destination also receives transmissions from the relay on its channel. The eavesdrop... | {
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0812.2291 | Characterizing Truthful Multi-Armed Bandit Mechanisms | [
"cs.DS",
"cs.GT",
"cs.LG"
] | We consider a multi-round auction setting motivated by pay-per-click auctions for Internet advertising. In each round the auctioneer selects an advertiser and shows her ad, which is then either clicked or not. An advertiser derives value from clicks; the value of a click is her private information. Initially, neither t... | {
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0812.2301 | Cooperative Hybrid ARQ Protocols: Unified Frameworks for Protocol
Analysis | [
"cs.IT",
"math.IT"
] | Cooperative hybrid-ARQ (HARQ) protocols, which can exploit the spatial and temporal diversities, have been widely studied. The efficiency of cooperative HARQ protocols is higher than that of cooperative protocols, because retransmissions are only performed when necessary. We classify cooperative HARQ protocols as three... | {
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0812.2309 | Classification of Cell Images Using MPEG-7-influenced Descriptors and
Support Vector Machines in Cell Morphology | [
"stat.AP",
"cs.CV",
"stat.ML"
] | Counting and classifying blood cells is an important diagnostic tool in medicine. Support Vector Machines are increasingly popular and efficient and could replace artificial neural network systems. Here a method to classify blood cells is proposed using SVM. A set of statistics on images are implemented in C++. The MPE... | {
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0812.2313 | Urologic robots and future directions | [
"cs.RO"
] | PURPOSE OF REVIEW: Robot-assisted laparoscopic surgery in urology has gained immense popularity with the daVinci system, but a lot of research teams are working on new robots. The purpose of this study is to review current urologic robots and present future development directions. RECENT FINDINGS: Future systems are ex... | {
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0812.2324 | The MIMO Iterative Waterfilling Algorithm | [
"cs.IT",
"cs.GT",
"math.IT"
] | This paper considers the non-cooperative maximization of mutual information in the vector Gaussian interference channel in a fully distributed fashion via game theory. This problem has been widely studied in a number of works during the past decade for frequency-selective channels, and recently for the more general MIM... | {
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0812.2379 | On the Decoder Error Probability of Rank Metric Codes and
Constant-Dimension Codes | [
"cs.IT",
"math.IT"
] | Rank metric codes and constant-dimension codes (CDCs) have been considered for error control in random network coding. Since decoder errors are more detrimental to system performance than decoder failures, in this paper we investigate the decoder error probability (DEP) of bounded distance decoders (BDDs) for rank metr... | {
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0812.2388 | Physics of risk and uncertainty in quantum decision making | [
"physics.soc-ph",
"cs.AI",
"quant-ph"
] | The Quantum Decision Theory, developed recently by the authors, is applied to clarify the role of risk and uncertainty in decision making and in particular in relation to the phenomenon of dynamic inconsistency. By formulating this notion in precise mathematical terms, we distinguish three types of inconsistency: time ... | {
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0812.2405 | A New Trend in Optimization on Multi Overcomplete Dictionary toward
Inpainting | [
"cs.MM",
"cs.AI"
] | Recently, great attention was intended toward overcomplete dictionaries and the sparse representations they can provide. In a wide variety of signal processing problems, sparsity serves a crucial property leading to high performance. Inpainting, the process of reconstructing lost or deteriorated parts of images or vide... | {
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0812.2409 | Sensing Models and Its Impact on Network Coverage in Wireless Sensor
Network | [
"cs.IT",
"math.IT"
] | Network coverage of wireless sensor network (WSN) means how well an area of interest is being monitored by the deployed network. It depends mainly on sensing model of nodes. In this paper, we present three types of sensing models viz. Boolean sensing model, shadow-fading sensing model and Elfes sensing model. We invest... | {
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} |
0812.2411 | Probabilistic SVM/GMM Classifier for Speaker-Independent Vowel
Recognition in Continues Speech | [
"cs.MM",
"cs.AI"
] | In this paper, we discuss the issues in automatic recognition of vowels in Persian language. The present work focuses on new statistical method of recognition of vowels as a basic unit of syllables. First we describe a vowel detection system then briefly discuss how the detected vowels can feed to recognition unit. Acc... | {
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} |
0812.2454 | On the statistical physics of directed polymers in a random medium and
their relation to tree codes | [
"cs.IT",
"math.IT"
] | Using well-known results from statistical physics, concerning the almost-sure behavior of the free energy of directed polymers in a random medium, we prove that random tree codes achieve the distortion-rate function almost surely under a certain symmetry condition. | {
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} |
0812.2458 | Square Complex Orthogonal Designs with no Zero Entry for any $2^m$
Antennas | [
"cs.IT",
"math.IT"
] | Space-time block codes from square complex orthogonal designs (SCOD) have been extensively studied and most of the existing SCODs contain large number of zeros. The zeros in the designs result in high peak-to-average power ratio and also impose a severe constraint on hardware implementation of the code while turning of... | {
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} |
0812.2535 | Pattern Recognition and Memory Mapping using Mirroring Neural Networks | [
"cs.AI",
"cs.NE"
] | In this paper, we present a new kind of learning implementation to recognize the patterns using the concept of Mirroring Neural Network (MNN) which can extract information from distinct sensory input patterns and perform pattern recognition tasks. It is also capable of being used as an advanced associative memory where... | {
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} |
0812.2559 | A Separation Algorithm for Improved LP-Decoding of Linear Block Codes | [
"cs.IT",
"math.IT"
] | Maximum Likelihood (ML) decoding is the optimal decoding algorithm for arbitrary linear block codes and can be written as an Integer Programming (IP) problem. Feldman et al. relaxed this IP problem and presented Linear Programming (LP) based decoding algorithm for linear block codes. In this paper, we propose a new IP ... | {
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} |
0812.2574 | Feature Selection By KDDA For SVM-Based MultiView Face Recognition | [
"cs.CV",
"cs.LG"
] | Applications such as face recognition that deal with high-dimensional data need a mapping technique that introduces representation of low-dimensional features with enhanced discriminatory power and a proper classifier, able to classify those complex features. Most of traditional Linear Discriminant Analysis suffer from... | {
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} |
0812.2575 | Face Detection Using Adaboosted SVM-Based Component Classifier | [
"cs.CV",
"cs.LG"
] | Recently, Adaboost has been widely used to improve the accuracy of any given learning algorithm. In this paper we focus on designing an algorithm to employ combination of Adaboost with Support Vector Machine as weak component classifiers to be used in Face Detection Task. To obtain a set of effective SVM-weaklearner Cl... | {
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} |
0812.2602 | The statistical restricted isometry property and the Wigner semicircle
distribution of incoherent dictionaries | [
"cs.IT",
"cs.DM",
"math.IT",
"math.PR"
] | In this article we present a statistical version of the Candes-Tao restricted isometry property (SRIP for short) which holds in general for any incoherent dictionary which is a disjoint union of orthonormal bases. In addition, we show that, under appropriate normalization, the eigenvalues of the associated Gram matrix ... | {
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} |
0812.2702 | Standard Logics Are Valuation-Nonmonotonic | [
"cs.LO",
"cs.AI",
"quant-ph"
] | It has recently been discovered that both quantum and classical propositional logics can be modelled by classes of non-orthomodular and thus non-distributive lattices that properly contain standard orthomodular and Boolean classes, respectively. In this paper we prove that these logics are complete even for those class... | {
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} |
0812.2709 | Variations on a theme by Schalkwijk and Kailath | [
"cs.IT",
"math.IT"
] | Schalkwijk and Kailath (1966) developed a class of block codes for Gaussian channels with ideal feedback for which the probability of decoding error decreases as a second-order exponent in block length for rates below capacity. This well-known but surprising result is explained and simply derived here in terms of a res... | {
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} |
0812.2719 | Secret Sharing over Fast-Fading MIMO Wiretap Channels | [
"cs.IT",
"math.IT"
] | Secret sharing over the fast-fading MIMO wiretap channel is considered. A source and a destination try to share secret information over a fast-fading MIMO channel in the presence of a wiretapper who also makes channel observations that are different from but correlated to those made by the destination. An interactive a... | {
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} |
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