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Communications in computer and Information science 2014年 441卷 154-164页

作者： Papathanasiou, Anastasios Papanikolaou, Alexandros Vlachos, Vasileios Chaikalis, Konstantinos Dimou, Maria Karadimou, Magdalini Katsoula, Vaia Cyber Crime Prosecution Subdivision Financial Police and Cyber Crime Unit Hellenic Police Athens Greece Department of Computer Science and Engineering Technological Educational Institute of Thessaly Larissa Greece Department of Electrical and Computer Engineering University of Thessaly Volos Greece Data Protection Authority Athens Greece

ISBN: (纸本)9783319117096

The increased use of personal computers and other personal devices with the ability to connect to the Internet, as well as the availability of public WiFi hotspots, enabled people to make extensive use of the offered Internet services, thus rendering them a tempting target for cyber criminals. Furthermore, cyber crime has a transnational character and can simultaneously affect individuals at different geographical locations, thus requiring international cooperation in order to be fought effectively. This paper presents the various international efforts against cyber crime that involve Greece, along with the relevant legal framework and some planned developments for the future. © Springer International Publishing Switzerland 2014.

关键词： Cybersecurity

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Single trial classification for mobile BCI a multiway kernel approach 8

Single trial classification for mobile BCI a multiway kernel...

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8th International Conference on Bio-Inspired Systems and Signal processing, BIOSIGNALS 2015

作者： Billiet, Lieven Hunyadi, Borbála Matic, Vladimir Van Huffel, Sabine Verleysen, Michel De Vos, Maarten STADIUS Center for Dynamical Systems Signal Processing and Data Analytics Department of Electrical Engineering KU Leuven Kasteelpark Arenberg 10 Leuven3001 Belgium Medical IT IMinds Leuven3001 Belgium Institute for Information and Communication Technologies Electronics and Applied Mathematics Université Catholique de Louvain Place du levant 3 Louvain-La-Neuve1348 Belgium Methods in Neurocognitive Psychology Lab Department of Psychology Cluster of Excellence Hearing4all Carl von Ossietzky University Oldenburg Germany Research Center Neurosensory Science Carl von Ossietzky University Oldenburg Germany

ISBN: (纸本)9789897580697

Subspace methods have been applied in various application fields to obtain robust results. Using multilinear algebra, they can also be applied on structured tensorial data. This work combines this principle with the power of non-linear kernels to investigate its merits in single trial classification for a mobile BCI ERP classification task. The accuracy difference with regard to more conventional vector kernels is evaluated for sitting and walking condition, increasing training data set and averaging over multiple trials. The study concludes that in general, the tensorial approach does not yield any advantage, though it might for specific subjects.

关键词： Vectors

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Dynamic anti-windup design for anticipatory activation:enlargement of the domain of attraction

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science China(Information sciences) 2014年第1期57卷 164-177页

作者： WU XiongJun LIN Zongli Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information ProcessingMinistry of Education of China The 802 Institute of Shanghai Academy of Space Flight Technology The Eighth Academy of China Aerospace Science and Technology Corporation Charles L. Brown Department of Electrical and Computer Engineering University of Virginia

Traditional anti-windup compensators are designed for activation immediately at the occurrence of actuator ***,anti-windup compensators were designed for actuation either after the saturation has reached a certain level or in anticipation of its *** the case of static anti-windup compensators,it has been shown that an anti-windup compensator designed for activation in anticipation of actuator saturation would lead to better performance than those designed for immediate or delayed activation could,both in terms of transient performance and the size of the domain of *** recently,it has been shown that a dynamic anti-windup compensator designed for anticipatory activation would also result in better transient performance than those designed for immediate or delayed activation *** this paper,we design dynamic anti-windup compensators for the enlargement of the domain of *** compensators are designed respectively for immediate,delayed and anticipatory *** will show by simulation that a dynamic anti-windup compensator designed for anticipatory activation would result in a larger domain of attraction than a dynamic anti-windup compensator designed for immediate or delayed activation could.

关键词： actuator saturation anti-windup anticipatory activation domain of attraction dynamic com-pensator

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2D+t autoregressive framework for video texture completion

2D+t autoregressive framework for video texture completion

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作者： Racape, F. Doshkov, D. Koppel, M. Ndjiki-Nya, P. Image Processing Department Einsteinufer 37 Berlin10587 Germany Berlin Institute of Technology Department of Telecommunication Systems School of Electrical Engineering and Computer Science Einsteinufer 17 Berlin10587 Germany

ISBN: (纸本)9781479957514

In this paper, an improved 2D+t texture completion framework is proposed, providing high visual quality of completed dynamic textures. A Spatiotemporal Autoregressive model (STAR) is used to propagate the signal of several available frames onto frames containing missing textures. A Gaussian white noise classically drives the model to enable texture innovation. To improve this method, an innovation process is proposed, that uses texture information from available training frames. The proposed method is deterministic, which solves a key problem for applications such as synthesis-based video coding. Compression simulations show potential bitrate savings up to 49% on texture sequences at comparable visual quality. Video results are provided online to allow assessing the visual quality of completed textures. © 2014 IEEE.

关键词： White noise

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Current-aware scheduling for flash storage devices 20

Current-aware scheduling for flash storage devices

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20th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications, RTCSA 2014

作者： Huang, Tzu-Jung Ho, Chien-Chung Huang, Po-Chun Chang, Yuan-Hao Chang, Che-Wei Kuo, Tei-Wei Department of Computer Science and Information Engineering National Taiwan University Taipei106 Taiwan Department of Computer Science Engineering and Innovation Center for Big Data and Digital Convergence Yuan Ze University Taoyuan320 Taiwan Institute of Information Science Academia Sinica Taipei115 Taiwan Department of Computer Science and Information Engineering School of Electrical and Computer Engineering Chang Gung University Taoyuan320 Taiwan

ISBN: (纸本)9781479939534

As NAND flash memory has become a major choice of storage media in diversified computing environments, the performance issue of flash memory has been extensively addressed in many excellent designs. Among them, an effective strategy is to adopt multiple channels and flash-memory chips to improve the performance on data accesses. However, the degree of data access parallelism cannot be increased by simply increasing the number of channels and chips in the storage device, because it is seriously limited by the maximum current constraint of the bus interface and affected by the access patterns of user data. As a consequence, to maximize the degree of access parallelism, it is of paramount significance to have a proper scheduling strategy to determine the order that read/write requests are served. In this paper, a current-aware scheduling strategy for read/write requests is proposed to maximize the read performance without violating the bus current constraint and without missing (the deadline of) written data. The proposed strategy is then evaluated through a series of experiments, in which the results are quite encouraging. © 2014 IEEE.

关键词： Flash memory

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Effect of channel aging on the sum rate of uplink massive MIMO systems

Effect of channel aging on the sum rate of uplink massive MI...

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IEEE International Symposium on Information Theory

作者： Chuili Kong Caijun Zhong Anastasios K. Papazafeiropoulos Michail Matthaiou Zhaoyang Zhang Institute of Information and Communication Engineering Zhejiang University Hangzhou China National Mobile Communications Research Laboratory Southeast University Nanjing China Communications and Signal Processing Group Imperial College London London U.K Department of Signals and Systems Chalmers University of Technology Gothenburg Sweden Electrical Engineering and Computer Science Queen's University Belfast Belfast U.K

ISBN: (纸本)9781467377058

This paper investigates the achievable sum-rate of uplink massive multiple-input multiple-output (MIMO) systems considering a practical channel impairment, namely, aged channel state information (CSI). Taking into account both maximum ratio combining (MRC) and zero-forcing (ZF) receivers at the base station, we present tight closed-form lower bounds on the sum-rate for both receivers, which provide efficient means to evaluate the sum-rate of the system. More importantly, we characterize the impact of channel aging on the power scaling law. Specifically, we show that the transmit power of each user can be scaled down by 1/√(M), which indicates that aged CSI does not affect the power scaling law; instead, it causes only a reduction on the sum rate by reducing the effective signal-to-interference-and-noise ratio (SINR).

关键词： Aging MIMO Receivers Uplink Channel estimation Antennas Training

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RIVER: Reconfigurable flow and fabric for real-time signal processing on FPGAs

RIVER: Reconfigurable flow and fabric for real-time signal p...

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作者： Brugger, Christian Hillenbrand, Dominic Balzer, Matthias Microelectronic Systems Design Research Group University of Kaiserslautern Germany Green Computing Systems Research and Development Center Department of Computer Science and Engineering Waseda University Tokyo Japan Institute for Data Processing and Electronics Karlsruhe Institute of Technology Germany

For high-performance embedded hard-real-time systems, ASICs and FPGAs hold advantages over generalpurpose processors and graphics accelerators (GPUs). However, developing signal processing architectures from scratch requires significant resources. Our design methodology is based on sets of configurable building blocks that provide storage, dataflow, computation, and control. Based on our building blocks, we generate hundreds of thousands of our dynamic streaming engine processors that we call DSEs. We store our DSEs in a repository that can be queried for (online) design space exploration. From this repository, DSEs can be downloaded and instantiated within milliseconds on FPGAs. If a loss of flexibility can be tolerated then ASIC implementations are feasible as well. In this article we focus on FPGA implementations. Our DSEs vary in cores, computational lanes, bitwidths, power consumption, and frequency. To the best of our knowledge we are the first to propose online design space exploration based on repositories of precompiled cores that are assembled of common building blocks. For demonstration purposes we map algorithms for image processing and financial mathematics to DSEs and compare the performance to existing highly optimized signal and graphics accelerators. © 2014 ACM.

关键词： Field programmable gate arrays (FPGA)

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MISO broadcasting FBMC system for highly frequency selective channels 18

MISO broadcasting FBMC system for highly frequency selective...

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18th International ITG Workshop on Smart Antennas, WSA 2014

作者： Newinger, Michael Baltar, Leonardo G. Swindlehurst, A. Lee Nossek, Josef A. Institute for Circuit Theory and Signal Processing Technische Universität München München80290 Germany Department for Electrical Engineering and Computer Science University of California Irvine IrvineCA92697 United States

ISBN: (纸本)9783800735846

In this contribution we propose new techniques for multi-user MISO broadcasting with Filter Bank based Multicarrier (FBMC) systems using offset-QAM (OQAM). FBMC is a prominent alternative to OFDM that can achieve higher bandwidth efficiency since no cyclic prefix is required. However, when extending FBMC to a multi-antenna system, approaches that are used in OFDM cannot be directly applied due to its special structure and the existence of inter-carrier and intersymbol interference. We will consider a downlink scenario for the transmission from a multi-antenna base station to several single-antenna mobile stations. To this end, a Minimum Mean Square Error (MMSE) based multi-tap precoder and equalizer will be designed. Our method is of particular interest for highly frequency selective channels. © VDE Verlag GMBH · Berlin · Offenbach, Germany.

关键词： Orthogonal frequency division multiplexing

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Distributed hypothesis testing with social learning and symmetric fusion

Distributed hypothesis testing with social learning and symm...

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作者： Rhim, Joong Bum Goyal, Vivek K Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology CambridgeMA02139 United States GroupM Data and Analytics New YorkNY10001 United States Boston University Massachusetts Institute of Technology United States Google United States Department of Electrical and Computer Engineering Boston University BostonMA02215 United States

We study the utility of social learning in a distributed detection model with agents sharing the same goal: a collective decision that optimizes an agreed upon criterion. We show that social learning is helpful in some cases but is provably futile (and thus essentially a distraction) in other cases. Specifically, we consider Bayesian binary hypothesis testing performed by a distributed detection and fusion system, where all decision-making agents have binary votes that carry equal weight. Decision-making agents in the team sequentially make local decisions based on their own private signals and all precedent local decisions. It is shown that the optimal decision rule is not affected by precedent local decisions when all agents observe conditionally independent and identically distributed private signals. Perfect Bayesian reasoning will cancel out all effects of social learning. When the agents observe private signals with different signal-to-noise ratios, social learning is again futile if the team decision is only approved by unanimity. Otherwise, social learning can strictly improve the team performance. Furthermore, the order in which agents make their decisions affects the team decision. © 1991-2012 IEEE.

关键词： Signal to noise ratio

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On YASS’s Non-monotonic Security Performance

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Circuits, Systems, and Signal processing 2014年第11期33卷 3527-3537页

作者： Yu, Lifang Zhao, Yao Ni, Rongrong Shi, Yun Qing Institute of Information Science Beijing Jiaotong University Beijing100044 China Beijing Key Laboratory of Signal and Information Processing for High-end Printing Equipments Beijing Institute of Graphic Communication Beijing102600 China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing100044 China Beijing Key Laboratory of Advanced Information Science and Network Technology Beijing100044 China Department of Electrical and Computer Engineering New Jersey Institute of Technology NewarkNJ07102 United States

Recently, researchers have discovered unexpected bumps in the detection rate curve of yet another steganographic scheme (YASS). We refer to this abnormal phenomenon as non-monotonic security performance. This paper first analyzes this abnormality and points out that it is caused by the non-uniformity in probability of coincidence of (Formula presented.) embedding blocks and (Formula presented.) JPEG blocks. Based on this observation, we propose that further randomizing data embedding positions can overcome the non-monotonic security performance. Experimental results have demonstrated a complete removal of bumps in the detection rate curve of YASS after further randomization. © 2014, Springer science+Business Media New York.

关键词： Steganography

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