id stringlengths 9 16 | title stringlengths 4 278 | categories listlengths 1 13 | abstract stringlengths 3 4.08k | filtered_category_membership dict |
|---|---|---|---|---|
1101.2405 | Improved Peak Cancellation for PAPR Reduction in OFDM Systems | [
"cs.IT",
"math.IT"
] | This letter presents an improved peak cancellation (PC) scheme for peak-to-average power ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM) systems. The main idea is based on a serial peak cancellation (SPC) mode for alleviating the peak regrowth of the conventional schemes. Based on the SPC mo... | {
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1101.2416 | Decentralized Formation Control Part I: Geometric Aspects | [
"math.OC",
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"cs.SY"
] | In this paper, we develop new methods for the analysis of decentralized control systems and we apply them to formation control problems. The basic set-up consists of a system with multiple agents corresponding to the nodes of a graph whose edges encode the information that is available to the agents. We address the que... | {
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1101.2421 | Decentralized Formation Control Part II: Algebraic aspects of
information flow and singularities | [
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"cs.MA",
"cs.SY"
] | Given an ensemble of autonomous agents and a task to achieve cooperatively, how much do the agents need to know about the state of the ensemble and about the task in order to achieve it? We introduce new methods to understand these aspects of decentralized control. Precisely, we introduce a framework to capture what ag... | {
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1101.2427 | Content-Based Filtering for Video Sharing Social Networks | [
"cs.CV",
"cs.SI"
] | In this paper we compare the use of several features in the task of content filtering for video social networks, a very challenging task, not only because the unwanted content is related to very high-level semantic concepts (e.g., pornography, violence, etc.) but also because videos from social networks are extremely a... | {
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1101.2435 | Networks with arbitrary edge multiplicities | [
"physics.soc-ph",
"cs.SI",
"physics.data-an"
] | One of the main characteristics of real-world networks is their large clustering. Clustering is one aspect of a more general but much less studied structural organization of networks, i.e. edge multiplicity, defined as the number of triangles in which edges, rather than vertices, participate. Here we show that the mult... | {
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1101.2478 | Delay and Power-Optimal Control in Multi-Class Queueing Systems | [
"math.OC",
"cs.SY"
] | We consider optimizing average queueing delay and average power consumption in a nonpreemptive multi-class M/G/1 queue with dynamic power control that affects instantaneous service rates. Four problems are studied: (1) satisfying per-class average delay constraints; (2) minimizing a separable convex function of average... | {
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1101.2483 | On Achievability of Gaussian Interference Channel Capacity to within One
Bit | [
"cs.IT",
"math.IT"
] | In the earlier version of this paper, it was wrongly claimed that time-sharing is required to achieve the capacity region of the Gaussian interference channel to within one bit, especially at corner points. The flaw in the argument of the earlier version lies in fixing the decoding paradigm for a fixed common/private m... | {
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1101.2491 | A Review of Research on Devnagari Character Recognition | [
"cs.CV"
] | English Character Recognition (CR) has been extensively studied in the last half century and progressed to a level, sufficient to produce technology driven applications. But same is not the case for Indian languages which are complicated in terms of structure and computations. Rapidly growing computational power may en... | {
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1101.2516 | Maximum Rate of Unitary-Weight, Single-Symbol Decodable STBCs | [
"cs.IT",
"math.IT"
] | It is well known that the Space-time Block Codes (STBCs) from Complex orthogonal designs (CODs) are single-symbol decodable/symbol-by-symbol decodable (SSD). The weight matrices of the square CODs are all unitary and obtainable from the unitary matrix representations of Clifford Algebras when the number of transmit ant... | {
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1101.2524 | Generalized Silver Codes | [
"cs.IT",
"math.IT"
] | For an $n_t$ transmit, $n_r$ receive antenna system ($n_t \times n_r$ system), a {\it{full-rate}} space time block code (STBC) transmits $n_{min} = min(n_t,n_r)$ complex symbols per channel use. The well known Golden code is an example of a full-rate, full-diversity STBC for 2 transmit antennas. Its ML-decoding complex... | {
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1101.2533 | A Low ML-decoding Complexity, Full-diversity, Full-rate MIMO Precoder | [
"cs.IT",
"math.IT"
] | Precoding for multiple-input, multiple-output (MIMO) antenna systems is considered with perfect channel knowledge available at both the transmitter and the receiver. For 2 transmit antennas and QAM constellations, an approximately optimal (with respect to the minimum Euclidean distance between points in the received si... | {
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1101.2549 | An Estimation of the Shortest and Largest Average Path Length in Graphs
of Given Density | [
"physics.soc-ph",
"cs.SI"
] | Many real world networks (graphs) are observed to be 'small worlds', i.e., the average path length among nodes is small. On the other hand, it is somewhat unclear what other average path length values networks can produce. In particular, it is not known what the maximum and the minimum average path length values are. I... | {
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1101.2575 | Errata list for "Error Control Coding" by Lin and Costello | [
"cs.IT",
"math.IT"
] | This document lists some errors found in the second edition of Error Control Coding by Shu Lin and Daniel J. Costello, Jr. | {
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1101.2613 | A Novel Probabilistic Pruning Approach to Speed Up Similarity Queries in
Uncertain Databases | [
"cs.DB"
] | In this paper, we propose a novel, effective and efficient probabilistic pruning criterion for probabilistic similarity queries on uncertain data. Our approach supports a general uncertainty model using continuous probabilistic density functions to describe the (possibly correlated) uncertain attributes of objects. In ... | {
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1101.2678 | Parallelization Strategies for Ant Colony Optimisation on GPUs | [
"cs.DC",
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] | Ant Colony Optimisation (ACO) is an effective population-based meta-heuristic for the solution of a wide variety of problems. As a population-based algorithm, its computation is intrinsically massively parallel, and it is there- fore theoretically well-suited for implementation on Graphics Processing Units (GPUs). The ... | {
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1101.2713 | Matched Filtering from Limited Frequency Samples | [
"cs.IT",
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] | In this paper, we study a simple correlation-based strategy for estimating the unknown delay and amplitude of a signal based on a small number of noisy, randomly chosen frequency-domain samples. We model the output of this "compressive matched filter" as a random process whose mean equals the scaled, shifted autocorrel... | {
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1101.2719 | CSSF MIMO RADAR: Low-Complexity Compressive Sensing Based MIMO Radar
That Uses Step Frequency | [
"cs.IT",
"math.IT"
] | A new approach is proposed, namely CSSF MIMO radar, which applies the technique of step frequency (SF) to compressive sensing (CS) based multi-input multi-output (MIMO) radar. The proposed approach enables high resolution range, angle and Doppler estimation, while transmitting narrowband pulses. The problem of joint an... | {
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1101.2721 | Optimized data sharing in multicell MIMO with finite backhaul capacity | [
"cs.IT",
"math.IT"
] | This paper addresses cooperation in a multicell environment where base stations (BSs) wish to jointly serve multiple users, under a constrained-capacity backhaul. We point out that for finite backhaul capacity a trade-off between sharing user data, which allows for full MIMO cooperation, and not doing so, which reduces... | {
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1101.2728 | Index Coding and Error Correction | [
"cs.IT",
"math.IT"
] | A problem of index coding with side information was first considered by Y. Birk and T. Kol (IEEE INFOCOM, 1998). In the present work, a generalization of index coding scheme, where transmitted symbols are subject to errors, is studied. Error-correcting methods for such a scheme, and their parameters, are investigated. ... | {
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1101.2785 | Multiplexed Model Predictive Control | [
"cs.SY",
"math.OC"
] | This paper proposes a form of MPC in which the control variables are moved asynchronously. This contrasts with most MIMO control schemes, which assume that all variables are updated simultaneously. MPC outperforms other control strategies through its ability to deal with constraints. This requires on-line optimization,... | {
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1101.2804 | Aging in language dynamics | [
"physics.soc-ph",
"cond-mat.stat-mech",
"cs.CL",
"cs.MA"
] | Human languages evolve continuously, and a puzzling problem is how to reconcile the apparent robustness of most of the deep linguistic structures we use with the evidence that they undergo possibly slow, yet ceaseless, changes. Is the state in which we observe languages today closer to what would be a dynamical attract... | {
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1101.2834 | Subjective Collaborative Filtering | [
"cs.IR",
"cs.SI"
] | We present an item-based approach for collaborative filtering. We determine a list of recommended items for a user by considering their previous purchases. Additionally other features of the users could be considered such as page views, search queries, etc... In particular we address the problem of efficiently comparin... | {
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1101.2926 | Convergence to consensus in multiagent systems and the lengths of
inter-communication intervals | [
"math.OC",
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"math.DS"
] | A theorem on (partial) convergence to consensus of multiagent systems is presented. It is proven with tools studying the convergence properties of products of row stochastic matrices with positive diagonals which are infinite to the left. Thus, it can be seen as a switching linear system in discrete time. It is further... | {
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1101.2937 | A Deterministic Polynomial--Time Algorithm for Constructing a Multicast
Coding Scheme for Linear Deterministic Relay Networks | [
"cs.IT",
"math.IT"
] | We propose a new way to construct a multicast coding scheme for linear deterministic relay networks. Our construction can be regarded as a generalization of the well-known multicast network coding scheme of Jaggi et al. to linear deterministic relay networks and is based on the notion of flow for a unicast session that... | {
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1101.2985 | Resequencing: A Method for Conforming to Conventions for Sharing Credits
Among Multiple Authors | [
"cs.DL",
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"cs.IR"
] | Devising an appropriate scheme that assigns the weights to share credits among multiple authors of a paper is a challenging task. This challenge comes from the fact that different types of conventions might be followed among different research discipline or research groups. In this paper, we discuss that for the purpos... | {
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1101.2987 | Support vector machines/relevance vector machine for remote sensing
classification: A review | [
"cs.CV",
"cs.LG"
] | Kernel-based machine learning algorithms are based on mapping data from the original input feature space to a kernel feature space of higher dimensionality to solve a linear problem in that space. Over the last decade, kernel based classification and regression approaches such as support vector machines have widely bee... | {
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1101.3051 | Adaptive Variable Degree-k Zero-Trees for Re-Encoding of Perceptually
Quantized Wavelet-Packet Transformed Audio and High Quality Speech | [
"cs.IT",
"math.IT"
] | A fast, efficient and scalable algorithm is proposed, in this paper, for re-encoding of perceptually quantized wavelet-packet transform (WPT) coefficients of audio and high quality speech and is called "adaptive variable degree-k zero-trees" (AVDZ). The quantization process is carried out by taking into account some ba... | {
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1101.3068 | Degrees of Freedom Region for an Interference Network with General
Message Demands | [
"cs.IT",
"math.IT"
] | We consider a single hop interference network with $K$ transmitters and $J$ receivers, all having $M$ antennas. Each transmitter emits an independent message and each receiver requests an arbitrary subset of the messages. This generalizes the well-known $K$-user $M$-antenna interference channel, where each message is r... | {
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1101.3070 | Information and the arrow of time | [
"physics.pop-ph",
"cs.IT",
"math.IT"
] | This paper is a discussion about the relationship between time and information. We argue that the direction of arrow of time is related to the directivity of information copying that occurs in Nature. | {
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1101.3085 | Simulating Opinion Dynamics in Heterogeneous Communication | [
"cs.SI",
"cs.MA",
"physics.soc-ph"
] | Since the information available is fundamental for our perceptions and opinions, we are interested in understanding the conditions allowing for a good information to be disseminated. This paper explores opinion dynamics by means of multi-agent based simulations when agents get informed by different sources of informati... | {
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1101.3098 | Quantum Convex Support | [
"math-ph",
"cs.IT",
"math.IT",
"math.MP",
"quant-ph"
] | Convex support, the mean values of a set of random variables, is central in information theory and statistics. Equally central in quantum information theory are mean values of a set of observables in a finite-dimensional C*-algebra A, which we call (quantum) convex support. The convex support can be viewed as a project... | {
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1101.3122 | Digital herders and phase transition in a voting model | [
"physics.soc-ph",
"cond-mat.stat-mech",
"cs.SI"
] | In this paper, we discuss a voting model with two candidates, C_1 and C_2. We set two types of voters--herders and independents. The voting of independent voters is based on their fundamental values; on the other hand, the voting of herders is based on the number of votes. Herders always select the majority of the prev... | {
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1101.3124 | SafeVchat: Detecting Obscene Content and Misbehaving Users in Online
Video Chat Services | [
"cs.CR",
"cs.CV",
"cs.HC"
] | Online video chat services such as Chatroulette, Omegle, and vChatter that randomly match pairs of users in video chat sessions are fast becoming very popular, with over a million users per month in the case of Chatroulette. A key problem encountered in such systems is the presence of flashers and obscene content. This... | {
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1101.3149 | Competition between Intra-community and Inter-community Synchronization | [
"physics.soc-ph",
"cs.SI",
"nlin.AO"
] | In this paper the effects of external links on the synchronization performance of community networks, especially on the competition between individual community and the whole network, are studied in detail. The study is organized from two aspects: the number or portion of external links and the connecting strategy of e... | {
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1101.3198 | Towards Optimal Schemes for the Half-Duplex Two-Way Relay Channel | [
"cs.IT",
"math.IT"
] | A restricted two-way communication problem in a small fully-connected network is investigated. The network consists of three nodes, all having access to a common channel with half-duplex constraint. Two nodes want to establish a dialog while the third node can assist in the bi-directional transmission process. All node... | {
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1101.3214 | Generalized Belief Propagation for the Noiseless Capacity and
Information Rates of Run-Length Limited Constraints | [
"cs.IT",
"math.IT",
"stat.CO"
] | The performance of the generalized belief propagation algorithm for computing the noiseless capacity and mutual information rates of finite-size two-dimensional and three-dimensional run-length limited constraints is investigated. For each constraint, a method is proposed to choose the basic regions and to construct th... | {
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1101.3220 | Decision-Feedback Differential Detection in Impulse-Radio Ultra-Wideband
Systems | [
"cs.IT",
"math.IT"
] | In this paper we present decision-feedback differential detection (DF-DD) schemes for autocorrelation-based detection in impulse-radio ultra-wideband (IR-UWB) systems, a signaling scheme regarded as a promising candidate in particular for low-complexity wireless sensor networks. To this end, we first discuss ideal nonc... | {
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1101.3285 | A note on the multiple unicast capacity of directed acyclic networks | [
"cs.IT",
"math.IT"
] | We consider the multiple unicast problem under network coding over directed acyclic networks with unit capacity edges. There is a set of n source-terminal (s_i - t_i) pairs that wish to communicate at unit rate over this network. The connectivity between the s_i - t_i pairs is quantified by means of a connectivity leve... | {
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1101.3291 | Node Classification in Social Networks | [
"cs.SI",
"physics.soc-ph"
] | When dealing with large graphs, such as those that arise in the context of online social networks, a subset of nodes may be labeled. These labels can indicate demographic values, interest, beliefs or other characteristics of the nodes (users). A core problem is to use this information to extend the labeling so that all... | {
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1101.3341 | Collaborative Filtering without Explicit Feedbacks for Digital Recorders | [
"cs.IR",
"cs.HC"
] | Recommendation is usually reduced to a prediction problem over the function $r(u_a, e_i)$ that returns the expected rating of element $e_i$ for user $u_a$. In the IPTV domain, we deal with an environment where the definitions of all the parameters involved in this function (i.e., user profiles, feedback ratings and ele... | {
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1101.3348 | Structured sublinear compressive sensing via belief propagation | [
"cs.IT",
"math.IT"
] | Compressive sensing (CS) is a sampling technique designed for reducing the complexity of sparse data acquisition. One of the major obstacles for practical deployment of CS techniques is the signal reconstruction time and the high storage cost of random sensing matrices. We propose a new structured compressive sensing s... | {
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1101.3352 | Dimensional behaviour of entropy and information | [
"math.FA",
"cs.IT",
"math.IT",
"math.PR"
] | We develop an information-theoretic perspective on some questions in convex geometry, providing for instance a new equipartition property for log-concave probability measures, some Gaussian comparison results for log-concave measures, an entropic formulation of the hyperplane conjecture, and a new reverse entropy power... | {
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1101.3354 | Introduction to the Bag of Features Paradigm for Image Classification
and Retrieval | [
"cs.CV",
"cs.IR"
] | The past decade has seen the growing popularity of Bag of Features (BoF) approaches to many computer vision tasks, including image classification, video search, robot localization, and texture recognition. Part of the appeal is simplicity. BoF methods are based on orderless collections of quantized local image descript... | {
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1101.3381 | Efficient Independence-Based MAP Approach for Robust Markov Networks
Structure Discovery | [
"cs.AI",
"cs.CV"
] | This work introduces the IB-score, a family of independence-based score functions for robust learning of Markov networks independence structures. Markov networks are a widely used graphical representation of probability distributions, with many applications in several fields of science. The main advantage of the IB-sco... | {
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1101.3391 | Automated Image Processing for the Analysis of DNA Repair Dynamics | [
"cs.CV",
"q-bio.QM"
] | The efficient repair of cellular DNA is essential for the maintenance and inheritance of genomic information. In order to cope with the high frequency of spontaneous and induced DNA damage, a multitude of repair mechanisms have evolved. These are enabled by a wide range of protein factors specifically recognizing diffe... | {
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1101.3393 | Traffic properties for stochastic routings on scale-free networks | [
"physics.soc-ph",
"cond-mat.stat-mech",
"cs.SI"
] | For realistic scale-free networks, we investigate the traffic properties of stochastic routing inspired by a zero-range process known in statistical physics. By parameters $\alpha$ and $\delta$, this model controls degree-dependent hopping of packets and forwarding of packets with higher performance at more busy nodes.... | {
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1101.3398 | New Quadriphase Sequences families with Larger Linear Span and Size | [
"cs.IT",
"math.IT"
] | In this paper, new families of quadriphase sequences with larger linear span and size have been proposed and studied. In particular, a new family of quadriphase sequences of period $2^n-1$ for a positive integer $n=em$ with an even positive factor $m$ is presented, the cross-correlation function among these sequences h... | {
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1101.3400 | Behavioral On-Line Advertising | [
"cs.IR"
] | We present a new algorithm for behavioral targeting of banner advertisements. We record different user's actions such as clicks, search queries and page views. We use the collected information on the user to estimate in real time the probability of a click on a banner. A banner is displayed if it either has the highest... | {
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1101.3444 | Control of Wireless Networks with Secrecy | [
"cs.IT",
"cs.DC",
"math.IT"
] | We consider the problem of cross-layer resource allocation in time-varying cellular wireless networks, and incorporate information theoretic secrecy as a Quality of Service constraint. Specifically, each node in the network injects two types of traffic, private and open, at rates chosen in order to maximize a global ut... | {
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1101.3453 | Algebraic Foundations for Information Theoretical, Probabilistic and
Guessability measures of Information Flow | [
"cs.IT",
"math.IT"
] | Several mathematical ideas have been investigated for Quantitative Information Flow. Information theory, probability, guessability are the main ideas in most proposals. They aim to quantify how much information is leaked, how likely is to guess the secret and how long does it take to guess the secret respectively. In t... | {
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1101.3457 | Capacity of DNA Data Embedding Under Substitution Mutations | [
"cs.IT",
"math.IT",
"q-bio.PE",
"q-bio.QM"
] | A number of methods have been proposed over the last decade for encoding information using deoxyribonucleic acid (DNA), giving rise to the emerging area of DNA data embedding. Since a DNA sequence is conceptually equivalent to a sequence of quaternary symbols (bases), DNA data embedding (diversely called DNA watermarki... | {
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1101.3465 | The "psychological map of the brain", as a personal information card
(file), - a project for the student of the 21st century | [
"cs.AI"
] | We suggest a procedure that is relevant both to electronic performance and human psychology, so that the creative logic and the respect for human nature appear in a good agreement. The idea is to create an electronic card containing basic information about a person's psychological behavior in order to make it possible ... | {
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1101.3500 | Computation for Supremal Simulation-Based Controllable and Strong
Observable Subautomata | [
"cs.SY"
] | Bisimulation relation has been successfully applied to computer science and control theory. In our previous work, simulation-based controllability and simulation-based observability are proposed, under which the existence of bisimilarity supervisor is guaranteed. However, a given specification automaton may not satisfy... | {
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1101.3574 | A Game-Theoretic View of the Interference Channel: Impact of
Coordination and Bargaining | [
"cs.IT",
"math.IT"
] | This work considers coordination and bargaining between two selfish users over a Gaussian interference channel. The usual information theoretic approach assumes full cooperation among users for codebook and rate selection. In the scenario investigated here, each user is willing to coordinate its actions only when an in... | {
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1101.3578 | Infinity in computable probability | [
"math.LO",
"cs.CL",
"cs.LO"
] | Does combining a finite collection of objects infinitely many times guarantee the construction of a particular object? Here we use recursive function theory to examine the popular scenario of an infinite collection of typing monkeys reproducing the works of Shakespeare. Our main result is to show that it is possible to... | {
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1101.3594 | Classification under Data Contamination with Application to Remote
Sensing Image Mis-registration | [
"stat.ME",
"cs.LG",
"stat.ML"
] | This work is motivated by the problem of image mis-registration in remote sensing and we are interested in determining the resulting loss in the accuracy of pattern classification. A statistical formulation is given where we propose to use data contamination to model and understand the phenomenon of image mis-registrat... | {
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1101.3620 | Clustering Protein Sequences Given the Approximation Stability of the
Min-Sum Objective Function | [
"cs.DS",
"cs.CE"
] | We study the problem of efficiently clustering protein sequences in a limited information setting. We assume that we do not know the distances between the sequences in advance, and must query them during the execution of the algorithm. Our goal is to find an accurate clustering using few queries. We model the problem a... | {
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1101.3684 | Bio-inspired Methods for Dynamic Network Analysis in Science Mapping | [
"cs.DL",
"cs.SI",
"physics.soc-ph"
] | We apply bio-inspired methods for the analysis of different dynamic bibliometric networks (linking papers by citation, authors, and keywords, respectively). Biological species are clusters of individuals defined by widely different criteria and in the biological perspective it is natural to (1) use different categoriza... | {
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1101.3719 | Trip Length Distribution Under Multiplicative Spatial Models of Supply
and Demand: Theory and Sensitivity Analysis | [
"physics.data-an",
"cs.SI",
"physics.soc-ph"
] | We propose new probabilistic models for the spatial distribution of supply and demand and use the models to determine how the trip length distribution is affected by the relative shortage or excess of supply, the spatial clustering of supply and demand, and the degree of attraction or repulsion between supply and deman... | {
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1101.3724 | Throughput-Delay Analysis of Random Linear Network Coding for Wireless
Broadcasting | [
"cs.IT",
"math.IT"
] | In an unreliable single-hop broadcast network setting, we investigate the throughput and decoding-delay performance of random linear network coding as a function of the coding window size and the network size. Our model consists of a source transmitting packets of a single flow to a set of $n$ users over independent er... | {
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1101.3735 | Formalising the multidimensional nature of social networks | [
"physics.soc-ph",
"cs.SI",
"q-bio.PE"
] | Individuals interact with conspecifics in a number of behavioural contexts or dimensions. Here, we formalise this by considering a social network between n individuals interacting in b behavioural dimensions as a nxnxb multidimensional object. In addition, we propose that the topology of this object is driven by indivi... | {
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1101.3755 | Transductive-Inductive Cluster Approximation Via Multivariate Chebyshev
Inequality | [
"cs.CV",
"cs.AI"
] | Approximating adequate number of clusters in multidimensional data is an open area of research, given a level of compromise made on the quality of acceptable results. The manuscript addresses the issue by formulating a transductive inductive learning algorithm which uses multivariate Chebyshev inequality. Considering c... | {
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1101.3761 | Tagging with DHARMA, a DHT-based Approach for Resource Mapping through
Approximation | [
"cs.DC",
"cs.SI"
] | We introduce collaborative tagging and faceted search on structured P2P systems. Since a trivial and brute force mapping of an entire folksonomy over a DHT-based system may reduce scalability, we propose an approximated graph maintenance approach. Evaluations on real data coming from Last.fm prove that such strategies ... | {
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1101.3774 | Secret Key Agreement Over Multipath Channels Exploiting a
Variable-Directional Antenna | [
"cs.IT",
"math.IT"
] | We develop an approach of key distribution protocol (KDP) proposed recently by T. Aono et al. A more general mathematical model based on the use of Variable-Directional Antenna (VDA) under the condition of multipath wave propagation is proposed. Statistical characteristics of VDA were investigated by simulation, that a... | {
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1101.3824 | Series Expansion for Interference in Wireless Networks | [
"cs.IT",
"math.IT",
"math.PR",
"stat.AP"
] | The spatial correlations in transmitter node locations introduced by common multiple access protocols makes the analysis of interference, outage, and other related metrics in a wireless network extremely difficult. Most works therefore assume that nodes are distributed either as a Poisson point process (PPP) or a grid,... | {
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1101.3838 | Performance Bounds for Sparse Parametric Covariance Estimation in
Gaussian Models | [
"cs.IT",
"math.IT",
"math.ST",
"stat.TH"
] | We consider estimation of a sparse parameter vector that determines the covariance matrix of a Gaussian random vector via a sparse expansion into known "basis matrices". Using the theory of reproducing kernel Hilbert spaces, we derive lower bounds on the variance of estimators with a given mean function. This includes ... | {
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1101.3885 | An Upper Bound for Signal Transmission Error Probability in Hyperbolic
Spaces | [
"cs.IT",
"math.IT"
] | We introduce and discuss the concept of Gaussian probability density function (pdf) for the n-dimensional hyperbolic space which has been proposed as an environment for coding and decoding signals. An upper bound for the error probability of signal transmission associated with the hyperbolic distance is established. Th... | {
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1101.3929 | Characteristic Generators and Dualization for Tail-Biting Trellises | [
"cs.IT",
"math.IT"
] | This paper focuses on dualizing tail-biting trellises, particularly KV-trellises. These trellises are based on characteristic generators, as introduced by Koetter/Vardy (2003), and may be regarded as a natural generalization of minimal conventional trellises, even though they are not necessarily minimal. Two dualizatio... | {
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1101.3973 | On cooperative patrolling: optimal trajectories, complexity analysis,
and approximation algorithms | [
"math.CO",
"cs.DS",
"cs.SY",
"math.OC"
] | The subject of this work is the patrolling of an environment with the aid of a team of autonomous agents. We consider both the design of open-loop trajectories with optimal properties, and of distributed control laws converging to optimal trajectories. As performance criteria, the refresh time and the latency are consi... | {
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1101.3979 | Selection of network coding nodes for minimal playback delay in
streaming overlays | [
"cs.MM",
"cs.IT",
"cs.NI",
"math.IT"
] | Network coding permits to deploy distributed packet delivery algorithms that locally adapt to the network availability in media streaming applications. However, it may also increase delay and computational complexity if it is not implemented efficiently. We address here the effective placement of nodes that implement r... | {
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1101.4003 | Dyna-H: a heuristic planning reinforcement learning algorithm applied to
role-playing-game strategy decision systems | [
"cs.AI",
"cs.LG",
"cs.SY",
"math.OC"
] | In a Role-Playing Game, finding optimal trajectories is one of the most important tasks. In fact, the strategy decision system becomes a key component of a game engine. Determining the way in which decisions are taken (online, batch or simulated) and the consumed resources in decision making (e.g. execution time, memor... | {
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1101.4028 | Who is the best player ever? A complex network analysis of the history
of professional tennis | [
"physics.soc-ph",
"cs.SI",
"physics.pop-ph"
] | We consider all matches played by professional tennis players between 1968 and 2010, and, on the basis of this data set, construct a directed and weighted network of contacts. The resulting graph shows complex features, typical of many real networked systems studied in literature. We develop a diffusion algorithm and a... | {
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1101.4036 | Secure Multiplex Coding with a Common Message | [
"cs.IT",
"cs.CR",
"math.IT"
] | We determine the capacity region of the secure multiplex coding with a common message, and evaluate the mutual information and the equivocation rate of a collection of secret messages to the second receiver (eavesdropper), which were not evaluated by Yamamoto et al. | {
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1101.4075 | PMI-based MIMO OFDM PHY Integrated Key Exchange (P-MOPI) Scheme | [
"cs.IT",
"math.IT"
] | In the literature, J.-P. Cheng et al. have proposed the MIMO-OFDM PHY integrated (MOPI) scheme for achieving physical-layer security in practice without using any cryptographic ciphers. The MOPI scheme uses channel sounding and physical-layer network coding (PNC) to prevent eavesdroppers from learning the channel state... | {
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1101.4100 | Reconciling Compressive Sampling Systems for Spectrally-sparse
Continuous-time Signals | [
"cs.IT",
"math.IT"
] | The Random Demodulator (RD) and the Modulated Wideband Converter (MWC) are two recently proposed compressed sensing (CS) techniques for the acquisition of continuous-time spectrally-sparse signals. They extend the standard CS paradigm from sampling discrete, finite dimensional signals to sampling continuous and possibl... | {
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1101.4101 | Context Capture in Software Development | [
"cs.SE",
"cs.AI"
] | The context of a software developer is something hard to define and capture, as it represents a complex network of elements across different dimensions that are not limited to the work developed on an IDE. We propose the definition of a software developer context model that takes into account all the dimensions that ch... | {
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1101.4103 | Evolutionary Mechanics: new engineering principles for the emergence of
flexibility in a dynamic and uncertain world | [
"nlin.AO",
"cs.AI"
] | Engineered systems are designed to deftly operate under predetermined conditions yet are notoriously fragile when unexpected perturbations arise. In contrast, biological systems operate in a highly flexible manner; learn quickly adequate responses to novel conditions, and evolve new routines/traits to remain competitiv... | {
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1101.4170 | The Role of Normalization in the Belief Propagation Algorithm | [
"cs.LG"
] | An important part of problems in statistical physics and computer science can be expressed as the computation of marginal probabilities over a Markov Random Field. The belief propagation algorithm, which is an exact procedure to compute these marginals when the underlying graph is a tree, has gained its popularity as a... | {
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1101.4204 | Measuring Performance of Continuous-Time Stochastic Processes using
Timed Automata | [
"cs.SY",
"cs.FL"
] | We propose deterministic timed automata (DTA) as a model-independent language for specifying performance and dependability measures over continuous-time stochastic processes. Technically, these measures are defined as limit frequencies of locations (control states) of a DTA that observes computations of a given stochas... | {
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1101.4207 | Blind Channel Estimation for Amplify-and-Forward Two-Way Relay Networks
Employing M-PSK Modulation | [
"cs.IT",
"math.IT",
"stat.OT"
] | We consider the problem of channel estimation for amplify-and-forward (AF) two-way relay networks (TWRNs). Most works on this problem focus on pilot-based approaches which impose a significant training overhead that reduces the spectral efficiency of the system. To avoid such losses, this work proposes blind channel es... | {
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1101.4211 | Throughput-optimal Scheduling in Multi-hop Wireless Networks without
Per-flow Information | [
"cs.NI",
"cs.IT",
"cs.PF",
"math.IT"
] | In this paper, we consider the problem of link scheduling in multi-hop wireless networks under general interference constraints. Our goal is to design scheduling schemes that do not use per-flow or per-destination information, maintain a single data queue for each link, and exploit only local information, while guarant... | {
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1101.4227 | Statistical Mechanics of Semi-Supervised Clustering in Sparse Graphs | [
"physics.data-an",
"cond-mat.dis-nn",
"cond-mat.stat-mech",
"cs.LG"
] | We theoretically study semi-supervised clustering in sparse graphs in the presence of pairwise constraints on the cluster assignments of nodes. We focus on bi-cluster graphs, and study the impact of semi-supervision for varying constraint density and overlap between the clusters. Recent results for unsupervised cluster... | {
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} |
1101.4270 | A Comparative Agglomerative Hierarchical Clustering Method to Cluster
Implemented Course | [
"cs.DB"
] | There are many clustering methods, such as hierarchical clustering method. Most of the approaches to the clustering of variables encountered in the literature are of hierarchical type. The great majority of hierarchical approaches to the clustering of variables are of agglomerative nature. The agglomerative hierarchica... | {
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1101.4279 | Low-Complexity Detection/Equalization in Large-Dimension MIMO-ISI
Channels Using Graphical Models | [
"cs.IT",
"math.IT"
] | In this paper, we deal with low-complexity near-optimal detection/equalization in large-dimension multiple-input multiple-output inter-symbol interference (MIMO-ISI) channels using message passing on graphical models. A key contribution in the paper is the demonstration that near-optimal performance in MIMO-ISI channel... | {
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1101.4285 | Degree and connectivity of the Internet's scale-free topology | [
"cs.NI",
"cs.SI",
"physics.soc-ph"
] | In this paper we theoretically and empirically study the degree and connectivity of the Internet's scale-free topology at the autonomous system (AS) level. The basic features of the scale-free network have influence on the normalization constant of the degree distribution p(k). We develop a mathematics model of the Int... | {
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1101.4301 | Diffusion framework for geometric and photometric data fusion in
non-rigid shape analysis | [
"cs.CV"
] | In this paper, we explore the use of the diffusion geometry framework for the fusion of geometric and photometric information in local and global shape descriptors. Our construction is based on the definition of a diffusion process on the shape manifold embedded into a high-dimensional space where the embedding coordin... | {
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1101.4313 | A weak spectral condition for the controllability of the bilinear
Schr\"odinger equation with application to the control of a rotating planar
molecule | [
"math.OC",
"cs.SY",
"math.AP"
] | In this paper we prove an approximate controllability result for the bilinear Schr\"odinger equation. This result requires less restrictive non-resonance hypotheses on the spectrum of the uncontrolled Schr\"odinger operator than those present in the literature. The control operator is not required to be bounded and we ... | {
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1101.4335 | Peak Reduction and Clipping Mitigation by Compressive Sensing | [
"cs.IT",
"math.IT",
"math.ST",
"stat.TH"
] | This work establishes the design, analysis, and fine-tuning of a Peak-to-Average-Power-Ratio (PAPR) reducing system, based on compressed sensing at the receiver of a peak-reducing sparse clipper applied to an OFDM signal at the transmitter. By exploiting the sparsity of the OFDM signal in the time domain relative to a ... | {
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1101.4343 | Fundamental Tradeoffs on Green Wireless Networks | [
"cs.IT",
"math.IT"
] | Traditional design of mobile wireless networks mainly focuses on ubiquitous access and large capacity. However, as energy saving and environmental protection become a global demand and inevitable trend, wireless researchers and engineers need to shift their focus to energy-efficiency oriented design, that is, green rad... | {
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1101.4351 | Building a Chaotic Proved Neural Network | [
"cs.AI",
"cs.CR",
"math.DS",
"math.GN"
] | Chaotic neural networks have received a great deal of attention these last years. In this paper we establish a precise correspondence between the so-called chaotic iterations and a particular class of artificial neural networks: global recurrent multi-layer perceptrons. We show formally that it is possible to make thes... | {
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} |
1101.4356 | Meaning Negotiation as Inference | [
"cs.AI"
] | Meaning negotiation (MN) is the general process with which agents reach an agreement about the meaning of a set of terms. Artificial Intelligence scholars have dealt with the problem of MN by means of argumentations schemes, beliefs merging and information fusion operators, and ontology alignment but the proposed appro... | {
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} |
1101.4372 | Order Optimal Information Spreading Using Algebraic Gossip | [
"cs.IT",
"cs.DC",
"cs.NI",
"math.IT"
] | In this paper we study gossip based information spreading with bounded message sizes. We use algebraic gossip to disseminate $k$ distinct messages to all $n$ nodes in a network. For arbitrary networks we provide a new upper bound for uniform algebraic gossip of $O((k+\log n + D)\Delta)$ rounds with high probability, wh... | {
"Other": 1,
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"cs.MA": 0,
"cs.NE": 0,
"cs.RO": 0,
"cs.SD": 0,
"cs.SI": 0,
"cs.SY": 0
} |
1101.4373 | Statistical Multiresolution Dantzig Estimation in Imaging: Fundamental
Concepts and Algorithmic Framework | [
"stat.AP",
"cs.CV",
"cs.SY",
"math.OC",
"stat.CO"
] | In this paper we are concerned with fully automatic and locally adaptive estimation of functions in a "signal + noise"-model where the regression function may additionally be blurred by a linear operator, e.g. by a convolution. To this end, we introduce a general class of statistical multiresolution estimators and deve... | {
"Other": 0,
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"cs.NE": 0,
"cs.RO": 0,
"cs.SD": 0,
"cs.SI": 0,
"cs.SY": 1
} |
1101.4378 | Cycles of cooperation and defection in imperfect learning | [
"physics.soc-ph",
"cs.SI",
"nlin.AO"
] | When people play a repeated game they usually try to anticipate their opponents' moves based on past observations, and then decide what action to take next. Behavioural economics studies the mechanisms by which strategic decisions are taken in these adaptive learning processes. We here investigate a model of learning t... | {
"Other": 0,
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"cs.RO": 0,
"cs.SD": 0,
"cs.SI": 1,
"cs.SY": 0
} |
1101.4388 | Reproducing Kernel Banach Spaces with the l1 Norm | [
"stat.ML",
"cs.LG",
"math.FA"
] | Targeting at sparse learning, we construct Banach spaces B of functions on an input space X with the properties that (1) B possesses an l1 norm in the sense that it is isometrically isomorphic to the Banach space of integrable functions on X with respect to the counting measure; (2) point evaluations are continuous lin... | {
"Other": 0,
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"cs.NE": 0,
"cs.RO": 0,
"cs.SD": 0,
"cs.SI": 0,
"cs.SY": 0
} |
1101.4431 | Parameter Optimization of Multi-Agent Formations based on LQR Design | [
"cs.SY",
"cs.MA"
] | In this paper we study the optimal formation control of multiple agents whose interaction parameters are adjusted upon a cost function consisting of both the control energy and the geometrical performance. By optimizing the interaction parameters and by the linear quadratic regulation(LQR) controllers, the upper bound ... | {
"Other": 0,
"cs.AI": 0,
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"cs.MA": 1,
"cs.NE": 0,
"cs.RO": 0,
"cs.SD": 0,
"cs.SI": 0,
"cs.SY": 1
} |
1101.4435 | Solutions for the MIMO Gaussian Wiretap Channel with a Cooperative
Jammer | [
"cs.IT",
"math.IT"
] | We study the Gaussian MIMO wiretap channel with a transmitter, a legitimate receiver, an eavesdropper and an external helper, each equipped with multiple antennas. The transmitter sends confidential messages to its intended receiver, while the helper transmits jamming signals independent of the source message to confus... | {
"Other": 0,
"cs.AI": 0,
"cs.CE": 0,
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"cs.MA": 0,
"cs.NE": 0,
"cs.RO": 0,
"cs.SD": 0,
"cs.SI": 0,
"cs.SY": 0
} |
1101.4439 | Reproducing Kernel Banach Spaces with the l1 Norm II: Error Analysis for
Regularized Least Square Regression | [
"stat.ML",
"cs.LG",
"math.FA"
] | A typical approach in estimating the learning rate of a regularized learning scheme is to bound the approximation error by the sum of the sampling error, the hypothesis error and the regularization error. Using a reproducing kernel space that satisfies the linear representer theorem brings the advantage of discarding t... | {
"Other": 0,
"cs.AI": 0,
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"cs.CR": 0,
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"cs.LG": 1,
"cs.MA": 0,
"cs.NE": 0,
"cs.RO": 0,
"cs.SD": 0,
"cs.SI": 0,
"cs.SY": 0
} |
1101.4445 | Spectrum Management for Cognitive Radio based on Genetics Algorithm | [
"cs.NE"
] | Spectrum scarceness is one of the major challenges that the present world is facing. The efficient use of existing licensed spectrum is becoming most critical as growing demand of the radio spectrum. Different researches show that the use of licensed are not utilized inefficiently. It has been also shown that primary u... | {
"Other": 0,
"cs.AI": 0,
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"cs.MA": 0,
"cs.NE": 1,
"cs.RO": 0,
"cs.SD": 0,
"cs.SI": 0,
"cs.SY": 0
} |
1101.4450 | Adaptive Submodular Optimization under Matroid Constraints | [
"cs.DS",
"cs.AI"
] | Many important problems in discrete optimization require maximization of a monotonic submodular function subject to matroid constraints. For these problems, a simple greedy algorithm is guaranteed to obtain near-optimal solutions. In this article, we extend this classic result to a general class of adaptive optimizatio... | {
"Other": 1,
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"cs.CE": 0,
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"cs.MA": 0,
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"cs.SD": 0,
"cs.SI": 0,
"cs.SY": 0
} |
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