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MILCOM, Military Communications Conference

作者： Kevin M. McNeill Mingkuan Liu Jeffrey J. Rodriguez BAE Systems Network Enabled Solutions Reston VA USA Department of Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA

Extension of the infrastructure supporting network-centric operations to the tactical edge relies primarily on wireless communications. The nature of these communications ensures that the channel will vary dramatically due to environmental and propagation effects, as well as potential interferers. Tactical operations introduce additional impairment due to mobility. With convergence to Internet protocol (IP) centric networking, voice communications at the tactical edge will be increasingly dependent on voice over IP (VoIP). In a packet-based protocol such as IP, two critical factors affecting latency sensitive applications such as VoIP are end-to-end delay and packet loss. Making a tradeoff between these two factors is of prime consideration in designing the jitter buffer playout scheme. Since voice packets are delayed in the network randomly, the jitter buffer is required to maintain consistently spaced playout of voice samples. A deep buffer protects against packet loss due to late arrival of packets. However, a deep buffer introduces mouth-to-ear delay that ultimately degrades the perceived voice quality. We describe an algorithm for dynamically estimating network delay using time series models. This enables the VoIP application to manage the jitter buffer to maintain a minimum playout buffer, while keeping the packet loss rate above a minimal threshold to maintain consistent voice quality. Our proposed algorithm limits sensitivity to short-term delay jitter and is very reactive to bursty network traffic. Simulation results show an improvement of 11% to 15% using metrics based on the subjective ITU E-model (R-factor) when compared against currently used playout methods. The improvement gain from the proposed method may be of particular significance for the challenges of supporting bursty dynamic changing wireless communication channel.

关键词： Jitter Wireless networks Wireless communication Protocols Delay estimation Potential well Convergence IP networks Internet telephony Protection

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A Proxy network Topology and Reconfiguration Algorithm for Resistance to DoS Attacks

A Proxy Network Topology and Reconfiguration Algorithm for R...

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IEEE International Symposium on network Computing and Applications

作者： S. Frechette D.R. Avresky Riverside Research Institute Lexington MA USA Network Computing Laboratory Electrical and Computer Engineering Department Northeastern University Boston MA USA

This paper proposes a novel proxy network topology. The proposed network topology exhibits several attributes that strengthen the proxy network's resistance to DoS attacks. Additionally, a novel reconfiguration algorithm for a class of proxy network topologies is proposed, and shown to decrease the topologies' vulnerability to DoS attacks. Proxy networks enable applications to communicate with users without disclosing their IP's. An application's resistance to DoS attacks is improved by hiding it behind a proxy network. We evaluate the proposed topology's fault tolerance and its effectiveness in the resistance to DoS attacks

关键词： network topology computer crime Electric resistance computer networks Fault tolerance Web and internet services Robustness Condition monitoring Resists IP networks

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A delay-based analytical provisioning model for a QoS-enabled service

A delay-based analytical provisioning model for a QoS-enable...

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IEEE International Conference on Communications (ICC)

作者： Christos Bouras Afrodite Sevasti RA Computer Technology Institute-RACTI Department of Computer Engineering and Informatics University of Patras Patras Greece Greek Research and Technology Network S. A. Athens Greece

Carefully designed and managed services are essential for quality-demanding traffic, especially in large-scale IP networks where the aggregation of flows and the variety of traffic types are extensive. Although individual mechanisms have been widely investigated, not much related work exists on integrated approaches to QoS provisioning that are also feasible to implement. This work presents a thorough approach to the design, dimensioning and provisioning of a high priority service for high-quality demanding traffic over an IP network. Our approach employs efficient scheduling and a dynamic admission control scheme while demonstrating novel characteristics in terms of the quality offered to IP flows.

关键词： Delay Analytical models Telecommunication traffic Traffic control IP networks Quality management Large-scale systems Quality of service Communication system traffic control Dynamic scheduling

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Multi-robot concurrent learning of cooperative behaviours for the tracking of multiple moving targets

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International Journal of Vehicle Autonomous Systems 2006年第2-4期4卷 196-215页

作者： Liu, Zheng Ang Jr., Marcelo H. Seah, Winston Khoon Guan Department of Electrical and Computer Engineering National University of Singapore Institute for Infocomm Research Singapore 119260 Singapore Department of Mechanical Engineering National University of Singapore Singapore 119260 Singapore Network Technology Department Institute for Infocomm Research Agency for Science Technology and Research Singapore 119613 Singapore

Reinforcement learning has been extensively studied and applied for generating cooperative behaviours in multi-robot systems. However, traditional reinforcement learning algorithms assume discrete state and action spaces with finite number of elements. This limits the learning to discrete behaviours and cannot be applied to most real multi-robot systems that inherently require appropriate combinations of different elementary behaviours. To address this problem, we design a distributed learning controller that integrates reinforcement learning with behaviour-based control networks. This learning controller can enable the robots to generate appropriate control policy without the need for human design or hardcoding. Furthermore, to address the problems in concurrent learning, we propose a distributed learning control algorithm to coordinate the concurrent learning processes. The distributed learning controller and learning control algorithm are applied to multi-robot tracking of multiple moving targets. The efficacy of our proposed scheme is shown through simulations. Copyright © 2006 Inderscience Enterprises Ltd.

关键词： Tracking (position)

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A novel synthesis method for designing electromagnetic band gap (EBG) structures in packaged mixed signal systems

A novel synthesis method for designing electromagnetic band ...

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Electronic Components and Technology Conference (ECTC)

作者： Tae Hong Kim Daehyun Chung Ege Engin Wansuk Yun Y. Toyota M. Swaminathan Department of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA EECS Korea Advanced Institute of Science and Technology Daejeon South Korea Department of Communication Network Engineering Okayama University Naka Okayama Japan

Electromagnetic (EM) simulation of electromagnetic band gap (EBG) structures is computationally expensive when multiple iterations are required. For the first time, in this paper, a novel synthesis method for designing EBG structures has been proposed. The method consists of three major approaches: current path approximation method (CPA-method), border to border radius (B2BR), and power loss method (PLM). CPA-method is based on the current flow on a periodically patterned power/ground plane. CPA-method gives a final dimension of EBG structure for a desired stop band frequency. B2BR determines the maximum number of patches implementable within a given area. PLM calculates isolation level of an EBG structure based on the transmitted power. The proposed approaches have been combined together to synthesize an EBG structure for a given specification. The synthesized EBG structure with these approaches has been fabricated and verified with EM simulation and measurement. The EBG structure has shown excellent stop band and isolation level agreements with the desired specification

关键词： Periodic structures Signal synthesis Design methodology Signal design Metamaterials Packaging Frequency Circuit noise Photonic band gap Power supplies

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Ultra-fast Binary Code Pulse Train Generation Using Planar Lightwave Circuits

Ultra-fast Binary Code Pulse Train Generation Using Planar L...

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IEEE Photonics Conference (IPC)

作者： Bing Xia Lawrence R. Chen Patrick Dumais Claire L. Callender Department of Electrical and Computer Engineering McGill University Montreal QUE Canada Broadband Network Technologies Branch Communication Research Center Ottawa ONT Canada

We experimentally demonstrate all-optical generation of 40 GHz pulse trains with binary code profiles from a 10 GHz uniform input pulse train using a lattice-form Mach-Zehnder interferometer fabricated on a silica-bas... 详细信息

关键词： Binary codes Pulse circuits Pulse generation Optical pulse generation Optical filters Optical signal processing Programmable control Fabrication Optical interferometry Optical packet switching

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WSN06-1: Geo-Location using Received Signal Statistics

WSN06-1: Geo-Location using Received Signal Statistics

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IEEE Globecom 2006

作者： P. Sharma Satish K. Tripathi Developers of QualNet Software Scalable Network Technologies Inc. Department of Computer Science and Engineering State University of New York University at Buffalo USA

A novel approach to geo-locate sensor-nodes in a Ricean fading environment is presented. For localization, this work considers autocorrelation characteristics of short term fading that are typically averaged out in traditional signal-strength based algorithms. Location attributes of the sensor nodes are determined by minimizing the squared error between the estimated autocorrelation function and its theoretical approximation. The theoretical approximation of the autocorrelation function is derived in closed form from Aulin's three-dimensional channel model. It is shown that despite noisy measurements and weak line-of-sight signal, the proposed method estimates coordinates of sensor nodes within an error of less than plusmn5% for signal-to-noise ratios higher than 20 dB.

关键词： Statistics Fading Autocorrelation Transmitters Sensor arrays Distance measurement Sensor phenomena and characterization Signal to noise ratio Coordinate measuring machines Maximum likelihood estimation

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Implementations of Grid-Based Distributed Parallel Computing

Implementations of Grid-Based Distributed Parallel Computing

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International Multi-Symposiums on computer and Computational Sciences (IMSCCS)

作者： Weiwei Lin Changgeng Guo Deyu Qi Yuehong Chen Zhang Zhili College of Computer Engineering and Science South China University of Technology Guangzhou Guangdong China Department of Information Engineering Xuchang Vocational and Technical College Xuchang China Department of Computer Science Polytechnic Normal University Guangzhou China Center of Network Xuchang University Xuchang China

Grid computing provides new solutions for numerous complex problems. It is an inevitable trend to implement the distributed parallel computing of large-scale problems with the grid. This paper presents two implementations for distributed parallel computing on globus toolkit, a wide-used grid environment. The first implementation, loosely coupled parallel services is used to achieve the large-scale parallel computing that can be broken down into independent sub-jobs by using the corresponding implementation framework, and the second implementation, grid MPI parallel program is able to deal with specialized applications, which can't easily be split up into numerous independent chunks, by using the proposed implementation framework. Finally, two examples of large-scale parallel computing based on proposed implementations are achieved and the experimental results are shown. We make a beneficial attempt to implement distributed parallel computing on grid computing environments

关键词： Parallel processing Grid computing Concurrent computing Large-scale systems computer networks Distributed computing Resource management Application software computer architecture Service oriented architecture

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Stopband prediction with dispersion diagram for electromagnetic bandgap structures in printed circuit boards

Stopband prediction with dispersion diagram for electromagne...

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IEEE International Symposium on Electromagnetic Compatibility (EMC)

作者： Y. Toyota A.E. Engin Tae Hong Kim M. Swaminathan K. Uriu Department of Communication Network Engineering Okayama University Okayama Japan Packaging Research Center School of Electrical and Computer Engineering Georgia Institute of Technology USA Packaging Research Center School of Electrical and Computer Engineering Georgia Institute of Technology USA EMC Design Group System Engineering Center Matsushita Elecrric Indusrrial Company Limited Japan

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Forwarding IPv4 Traffics in Pure IPv6 Backbone with Stateless Address Mapping

Forwarding IPv4 Traffics in Pure IPv6 Backbone with Stateles...

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IEEE Symposium on network Operations and Management

作者： Maoke Chen Xing Li Ang Li Yong Cui CERNET Network Research Center Tsinghua University Beijing China Department of Electronic Engineering Tsinghua University Beijing China Department of Computer Science Tsinghua University Beijing China

As the IPv6 networks rapidly deployed, the transition problem has been changed. Because the transition of applications is a steady process with a far longer duration in comparison to the transition of infrastructure, providers cannot give up the duty of serving IPv4 traffics for the time being. On the other hand, operating a dual-stack backbone is highly costing for large-scale deployment of new networks. In this paper, a new technique of forwarding IPv4 traffics in IPv6-only backbone is developed. Rather than the ever-existing tunneling approaches, the proposed one is automatic and stateless for end nodes, without explicit tunneling. The route entries for delivering IPv4 traffics are well aggregated on the borders of IPv6 autonomous systems. This makes the technique suitable for large-scale deployment in an inter-domain networking environment

关键词： Spine Telecommunication traffic Large-scale systems Tunneling Costing IP networks Protocols Internet Intelligent networks computer science

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