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IEEE International Conference on Communications

作者： Hao Hu Xiaoqing Zhu Yao Wang Rong Pan Jiang Zhu Flavio Bonomi Electrical & Computer Engineering Polytechnic Institute of NYU Advanced Architecture & Research Cisco Systems

ISBN: (纸本)9781457720529

In this paper, we present a proxy-based solution for adapting the scalable video streams at the edge of a wireless network, which can respond quickly to highly dynamic wireless links. Our design adopts the scalable video coding (SVC) technique for lightweight rate adaptation at the edge. We derive a QoE model, i.e., rate-quality tradeoff model, that relates the maximum subjective quality under a given rate by choosing the optimal frame rate and quantization stepsize. The proxy iteratively allocates rates of different video streams to maximize a weighted sum of video qualities associated with different streams, based on the periodically observed link throughputs and the sending buffer status. Simulation studies show that our scheme consistently outperforms TFRC in terms of agility to track link qualities and overall quality of all streams. In addition, the proposed scheme supports differential services for different streams, and competes fairly with TCP flows.

关键词： Wireless networks Proxy streams rivers scalable video TFRC gene rate adaptive Frame Rate agility weight sums Quantization Tritolyl Phosphates tactical command post

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Controllability And Observability Of Linear Time Varying Fractional Order systems

Controllability And Observability Of Linear Time Varying Fra...

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第五届国际自动控制联合会分数阶导数及其应用会议

作者： Xuefeng Zhang YangQuan Chen Institute of System Science Northeastern University ShenyangLiaoning 110004 China Center for Self-Organizing and Intelligent Systems Electrical and Computer Engineering Department Utah State University Logan UT 84322-4120 USA

Fractional order time varying dynamic systems are a kind of important and the less involved *** this paper,the state transition matrix of fractional order linear time varying systems is *** criteria of controllability... 详细信息

关键词： Controllability And Observability Of Linear Time Varying Fractional Order systems

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Non Existence Of Periodic Solutions Of Linear Time Varying Periodic Fractional Order systems

Non Existence Of Periodic Solutions Of Linear Time Varying P...

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第五届国际自动控制联合会分数阶导数及其应用会议

Existence of periodic solutions of fractional order dynamic systems is an important and difficult issue in fractional order systems *** this paper,the existences of periodic solutions of fractional order linear timeva... 详细信息

关键词： Laplace Non Existence Of Periodic Solutions Of Linear Time Varying Periodic Fractional Order systems

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Model checking cooperative multi-agent systems in BDI logic

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Journal of Information and Computational Science 2012年第5期9卷 1185-1194页

作者： Chen, Qingliang Su, Kaile Wu, Lijun Xu, Zhaocheng School of Electronics Engineering and Computer Science Peking University Beijing 100871 China Department of Computer Science Jinan University Guangzhou 510632 China Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai China Institute for Integrated and Intelligent Systems Griffith University Brisbane Australia School of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu China

Traditional temporal logics such as LTL (Linear Temporal Logic) and CTL (Computation Tree Logic) have shown tremendous success in specifying and verifying hardware and software systems. However, this kind of logic can only model the dynamic behaviors for a single system, and fall short in capturing the joint and concurrent aspects in the composition of systems, such as the interactions and coordinations of agents in Multi-agent systems. Although ATL (Alternating-time Temporal Logic) can solve the problem to a certain extent, by preceding the temporal operators with a selective path quantifier, to specify that the interactions between entities inside the system can make sure that there is a strategy to reach a certain state, it can not formalize the rational mental attitudes of the agents such as the Belief, Desire and Intention (BDI) which plays an essential role in decision making during cooperation with other agents. This paper will investigate this problem by proposing a logic of ATLBDI (Alternating-time Temporal Logic of Belief Desire and Intention) and discuss the algorithmic issues such as model checking algorithms and the computational complexity, along with examples to show its effectiveness. We conclude that model checking for ATLBDI is completely tractable and is in PTIME-Complete, which is quite an optimistic and promising result for further applications. © 2012 by Binary Information Press.

关键词： Multi agent systems

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Acoustic novelty detection based on AHLAC and NMF

Acoustic novelty detection based on AHLAC and NMF

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IEEE International Symposium on Intelligent Signal Processing and Communication systems (ISPACS)

作者： Akira Sasou Nyamerdene Odontsengel Smart Communication Research Group Intelligent Systems Research Institute Advanced Industrial Science and Technology Tsukuba Ibaraki Japan Department of Computer Science Graduate school of System and Information Engineering University of Tsukuba Tsukuba Ibaraki Japan

ISBN: (纸本)9781467350839

The importance of video surveillance applications has been increasing with the increase of crime and terrorism. In addition to traditional video cameras, the use of acoustic sensors in surveillance and monitoring applications is also becoming increasingly important. In this paper, we apply High-Order Local Auto-Correlation (HLAC), which has succeeded in video surveillance applications, to extract features from acoustic signals in order to construct an acoustic surveillance system based on a novelty detection approach. We also apply Non-Negative Matrix Factorization (NMF) to this problem. Experiment results confirmed that the AHLAC-based method outperforms the NMF-based and the cepstrum-based methods under all SNR conditions. The combined NMF-AHLAC method was able to improve the Equal Error Rate (EER) at lower SNRs, although the EERs at higher SNRs tend to degrade.

关键词： Acoustics Time frequency analysis Vectors Feature extraction Matrix decomposition Video surveillance

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Three-dimensional hierarchical microbattery electrodes for tunable high energy and power density batteries

Three-dimensional hierarchical microbattery electrodes for t...

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2012 Solid-State Sensors, Actuators and Microsystems Workshop, Hilton Head 2012

作者： Gerasopoulos, K. Pomerantseva, E. Brown, A. Wang, C. Culver, J. McCarthy, M. Ghodssi, R. MEMS Sensors and Actuators Laboratory Institute for Systems Research University of Maryland College ParkMD20742 United States Department of Electrical and Computer Engineering University of Maryland College ParkMD20742 United States Department of Materials Science and Engineering University of Maryland College ParkMD20742 United States Department of Plant Sciences and Landscape Architecture University of Maryland College ParkMD20742 United States Department of Chemical and Biomolecular Engineering University of Maryland College ParkMD20742 United States Department of Mechanical Engineering and Mechanics Drexel University PhiladelphiaPA19104 United States

ISBN: (纸本)9780964002494

We present a novel approach for the fabrication of hierarchical electrodes that integrates bottom-up nanostructure self-assembly and top-down microfabrication processes. The electrodes consist of virus-templated nanostructures self-assembled on three-dimensional micropillars. Active battery material (V2O5) is conformally deposited using atomic layer deposition (ALD) on the hierarchical micro/nano network. Electrochemical testing of these electrodes indicates a 3-fold increase in energy density compared to nanostructures alone, while maintaining the high power characteristics. Investigation of capacity scaling for varying active material thickness reveals underlying limitations and highlights the importance of our method in controlling both energy and power density with structural hierarchy. © 2012 TRF.

关键词： Actuators

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Social-Aware Routing for Wireless Mesh Networks

Social-Aware Routing for Wireless Mesh Networks

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IEEE Conference on Vehicular Technology (VTC)

作者： Shadi Saleh Basurra Yusheng Ji Marina De Vos Julian Padget Tim Lewis Simon Armour Department of Computer Science University of Bath UK Information Systems Architecture Science Research Division National Institute of Informatics Tokyo Japan Toshiba Research Europe Limited Bristol UK Department of Electrical and Electronic Engineering Bristol University UK

In wireless mesh networks (WMN), most routing algorithms apply broadcasting at some stage of the path discovery process. They thereby consume large chunks of the network throughput. Intelligent rebroadcast algorithms aim to reduce this overhead by calculating the usefulness of a rebroadcast and the likelihood of collisions. Unfortunately, this introduces latency and breaks the rebroadcast chain, resulting in reduced reachability. In this paper we present our Social-aware Routing Protocol with Parallel Collision Guidance Broadcasting for WMN (SCG). It reduces rebroadcasting without a loss in reachability and without a significant increase in latency. Our claims are validated through simulations comparing our algorithm with existing protocols.

关键词： Routing Routing protocols Broadcasting Delay Ad hoc networks Wireless mesh networks

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A cyclic small-gain condition and an equivalent matrix-like criterion for iISS networks

A cyclic small-gain condition and an equivalent matrix-like ...

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IEEE Conference on Decision and Control

作者： Hiroshi Ito Zhong-Ping Jiang Sergey N. Dashkovskiy Björn S. Rüffer Department of Systems Design and Informatics Kyushu Institute of Technology Iizuka Japan Department of Electrical and Computer Engineering Six Metrotech Center Polytechnic Institute of New York University Brooklyn NY USA Department of Civil Engineering University of Applied Sciences Erfurt Germany Signal and System Theory Group EIM-E University of Paderborn Paderborn Germany

ISBN: (纸本)9781467320658

This paper considers nonlinear dynamical networks consisting of individually iISS (integral input-to-state stable) subsystems which are not necessarily ISS (input-to-state stable). Stability criteria for internal and external stability of the networks are developed in view of both necessity and sufficiency. For the sufficiency, we show how we can construct a Lyapunov function of the network explicitly under the assumption that a cyclic small-gain condition is satisfied. The cyclic small-gain condition is shown to be equivalent to a matrix-like condition. The two conditions and their equivalence precisely generalize some central ISS results in the literature. Moreover, the necessity of the matrix-like condition is established. The allowable number of non-ISS subsystems for stability of the network is discussed through several necessity conditions.

关键词： Lyapunov methods Stability criteria Vectors Educational institutions Nickel USA Councils Indium tin oxide

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Using Data-Level Parallelism to Accelerate Instruction -Level Redundancy

Using Data-Level Parallelism to Accelerate Instruction -Leve...

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World Automation Congress

作者： Yu Hu Zhong liang Chen Xiaowei Li Key Laboratory of Computer System and Architecture Institute of Computing Technology CAS Beijing 100190 China Department of Electrical and Computer Engineering Northeastern University Boston MA 02115 USA

ISBN: (纸本)9781467344975

Instruction-level redundancy is an effective scheme to reduce the susceptibility of microprocessors to soft errors, offering high error detection and recovery capability;however, it usually incurs significant performance degradation due to resource racing. Motivated by the fact that narrow-width operands are commonly seen in applications, we exploit data-level parallelism to accelerate instruction-level redundancy. For the instructions within sphere of replication (SoR) of data-level redundancy, normal and redundant versions of the narrow-width operand of the instruction are folded into one register to share the same functional unit during execution hence alleviating resource racing. The other instructions are all protected by instructionlevel redundancy. We run SPECint2000 benchmarks on a modified version of SimpleScalar simulator, and synthesize the extra hardware to evaluate area overhead of the proposed pipeline. Experimental results show that our acceleration scheme outperforms conventional instruction-level redundancy by 13% in IPC. Besides, the extra area overhead is negligible.

关键词： Keywords Data-level redundancy Instruction-level redundancy Narrow-width value Sphere of replication

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ℋ ∞ stabilisation of switched linear stochastic systems under dwell time constraints

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International Journal of Control 2012年第9期85卷 1209-1217页

作者： Huang, Ran huangran_asee@*** Lin, Yan Ge, Shuzhi Sam Lin, Zhongwei School of Automation Bejing University of Aeronautics and Aeronautics Beijing 100191 China Institute of Intelligent Systems and Information Technology School of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu 611731 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China

Based on the determination of a minimum dwell time, this article addresses the problem of characterising a switching strategy for ℋ∞ stabilisation of switched linear stochastic systems with adapted external inputs. Sufficient conditions that assure exponential mean square stability and an ℋ∞ performance index are established by analysing the time evolution of the second-order moment of the state and a recursive dynamic programming inequality, respectively. Alternative conditions are derived for numerical implementations. The proposed method is illustrated by numerical simulations. [ABSTRACT FROM AUTHOR]

关键词： ℋ∞ control dwell time switched systems Wiener process

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