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A new parallel link interface with current-mode incremental signaling and per-pin skew compensation

A new parallel link interface with current-mode incremental ...

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50th Midwest symposium on Circuits and Systems

作者： Hu, An Yuan, Fei Ryerson Univ Dept Elect & Comp Engn Toronto ON M5B 2K3 Canada

ISBN: (纸本)1424411769

this paper proposes a new current-mode incremental signaling parallel link interface with per-pin skew compensation. Per-pin skew compensation is carried out in a calibration phase where clock-like training data are sent to all channels along with a reference clock of the same frequency. Training data are deskewed with respect to the common reference clock using DLLs such that all channels are skew-compensated simultaneously. New encoding and decoding scheme have been proposed to reduce the signal critical path at the transmitter. Transimpedance amplifiers with replica biasing are used to perform current-to-voltage conversion at the receiving end with a minimum sensitivity to supply voltage fluctuation. To evaluate the performance of the proposed skew compensating technique, a 1 Gbytes/s parallel link interface consisting of two data channels and one reference clock channel has been implemented with UMC 0.13 mu m 1.2 V CMOS technology and analyzed using SpectreRF from Cadence Design Systems with BIM3V3 device models. the channels are modeled as 50 Omega microstrip lines on a FR-4 substrate. Simulation results of the parallel link at all process corners have demonstrated that the proposed parallel link interface provides a minimum deskew range of 1.2 ns (+/- 0.6 ns in each direction).

关键词： Inter-signal timing skew parallel links Deskew Delay-locked loops

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A Fine-Grained Pipelined Implementation for Large-Scale Matrix Inversion on FPGA 1

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8th International symposium on Advanced parallel processing Technologies

作者： Zhou, Jie Dou, Yong Zhao, Jianxun Xia, Fei Lei, Yuanwu Tang, Yuxing NUDT Natl Lab Parallel & Distributed Proc Changsha 410073 Hunan Peoples R China Acad Armored Forces Engn Beijing Peoples R China

ISBN: (数字)9783642036446

ISBN: (纸本)9783642036439

Large-scale matrix inversion play an important role in many applications. However to the best of our knowledge, there is no FPGA-based implementation. In this paper, we explore the possibility of accelerating large-scale matrix inversion on FPGA. To exploit the computational potential of FPGA, we introduce a fine-grained parallel algorithm for matrix inversion. A scalable linear array processing elements (PEs), which is the core component of the FPGA accelerator, is proposed to implement this algorithm. A total of 12 PEs can be integrated into an Altera StratixII EP2S130F1020C5 FPGA on our self-designed board. Experimental results show that a factor of 2.6 speedup and the maximum power-performance of 41 can be achieved compare to Pentium Dual CPU with double SSE threads.

关键词： Field programmable gate arrays (FPGA)

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A game-theoretic analysis of denial of service attacks in wireless random access

A game-theoretic analysis of denial of service attacks in wi...

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5th International symposium on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks and Workshop

作者： Sagduyu, Yalin Evren Ephremides, Anthony Northwestern Univ Dept Elect Engn & Comp Sci Evanston IL 60208 USA Univ Maryland Dept Elect & Comp Engn College Pk MD 20742 USA

ISBN: (纸本)1424409616

In wireless access, transmitter nodes need to make individual decisions for distributed operation and do not necessarily cooperate with each other. We consider a single-receiver random access system of non-cooperative transmitters with the individual objectives of optimizing their throughput rewards, transmission energy costs and delay costs. the non-cooperative transmitter behavior may be purely selfish or may also reflect malicious objectives of generating interference to prevent the successful transmissions of the other nodes as a form of denial of service attack. Our goal is to evaluate the interactions between selfish and malicious nodes that have the dual objectives of optimizing their individual performance measures and blocking the packet transmissions of the other selfish nodes. We assume saturated packet queues of infinite buffer capacities and consider a general multi-packet reception channel that allows packet captures in the presence of simultaneous transmissions. In this context, we formulate a non-cooperative random access game of selecting the individual probabilities of transmitting packets to a common receiver. We derive the non-cooperative transmission strategies in Nash equilibrium. the analysis provides insights for the optimal strategies to block random access of selfish nodes as well as the optimal defense mechanisms against the possible denial of service attacks of malicious nodes in wireless networks. the results are also compared with the cooperative equilibrium strategies that optimize the total system utility (separately under random access and scheduled access). A pricing scheme is presented to improve the non-cooperative operation. For distributed implementation, we formulate a repeated game of the best-response strategy updates and introduce adaptive heuristics (based on the channel feedback only) provided that the system parameters are not explicitly known at the individual transmitters.

关键词： Wireless networks Medium access control Random access Game theory Competition Cooperation Malicious operation Denial of service attacks Pricing Adaptive update algorithms distributed control

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Maximizing network utilization with max-min fairness in wireless sensor networks

Maximizing network utilization with max-min fairness in wire...

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5th International symposium on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks and Workshop

作者： Sridharan, Avinash Krishnamachari, Bhaskar Univ So Calif Dept Elect Engn Los Angeles CA 90089 USA

ISBN: (纸本)1424409616

the state-of-the-art for optimal data-gathering in wireless sensor networks is to use additive increase algorithms to achieve fair rate allocation while implicity trying to maximize network utilization. For the quantification of the problem we present a receiver capacity model to capture the interference existing in a wireless network. We also provide empirical evidence to motivate the applicability of this model to a real CSMA based wireless network. Using this model, we explicitly formulate the problem of maximizing the network utilization subject to a max-min fair rate allocation constraint in the form of two coupled linear programs. We first show how the max-min rate can be computed efficiently for a given network. We then adopt a dual-based approach to maximize the network utilization. the analysis of the dual shows the sub-optimality of previously proposed additive increase algorithms with respect to bandwidth efficiency. Although in theory a dual-based sub-gradient search algorithm can take a long time to converge, we find empirically that setting all shadow prices to an equal and small constant value, results in near-optimal solutions within one iteration (within 2% of the optimum in 99.65% of the cases). this results in a fast heuristic distributed algorithm that has a nice intuitive explanation-rates are allocated sequentially after rank ordering flows based on the number of downstream receivers whose bandwidth they consume. We also investigate the near optimal performance of this heuristic by comparing the rank ordering of the source rates obtained from the heuristic to the solutions obtained by solving the linear program.

关键词： Wireless sensor networks Optimal rate control distributed dual based algorithms

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the 5th International Workshop on Security in Systems and Networks

The 5th International Workshop on Security in Systems and Ne...

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International symposium on parallel and distributed processing (IPDPS)

作者： Bin Xiao Wayne State University USA

the InternationalWorkshop on Security in Systems and Networks is a forum for the presentation and discussion of approaches, research findings, and experiences in the area of privacy, integrity, and availability of resources in distributed systems. this workshop aims to bring together the technologies and researchers who share interest in the area of network and distributed system security. the main purpose is to promote discussions of research and relevant activities in security-related subjects. It also aims at increasing the synergy between academic and industry professionals working in this area.

关键词： USA Councils Conferences Security Probability density function Educational institutions Data mining Springs

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Design of nodes for embedded and ultra low-power wireless sensor networks

Design of nodes for embedded and ultra low-power wireless se...

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5th International symposium on Instrumentation Science and Technology

作者： Xu, Jun You, Bo Cui, Juan Ma, Jing Li, Xin Harbin Univ Sci & Technol Coll Automat Harbin 150080 Peoples R China Harbin Univ Sci & Technol Ctr Comp Harbin 150080 Peoples R China

ISBN: (纸本)9780819473677

Sensor network integrates sensor technology, MEMS (Micro-Electro-Mechanical system) technology, embedded computing, wireless communication technology and distributed information management technology. It is of great value to use it where human is quite difficult to reach. Power consumption and size are the most important consideration when nodes are designed for distributed WSN (wireless sensor networks). Consequently, it is of great importance to decrease the size of a node, reduce its power consumption and extend its life in network. WSN nodes have been designed using JN5121-Z01-M01 module produced by jennic company and ieee 802.15.4/ZigBee technology. Its new features include support for CPU sleep modes and a long-term ultra low power sleep mode for the entire node. In low power configuration the node resembles existing small low power nodes. An embedded temperature sensor node has been developed to verify and explore our architecture. the experiment results indicate that the WSN has the characteristic of high reliability, good stability and ultra low power consumption.

关键词： ieee 802.15.4 ZigBee ultra-low power WSN

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Real-Time Video Surveillance over ieee 802.11 Mesh Networks

Real-Time Video Surveillance over IEEE 802.11 Mesh Networks

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15th ieee Real-Time and Embedded Technology and Application symposium

作者： Kandhalu, Arvind Rowe, Anthony Rajkumar, Ragunathan (Raj) Huang, Chingchun Yeh, Chao-Chun Carnegie Mellon Univ Dept Elect & Comp Engn Pittsburgh PA 15213 USA ITRI Hsinchu Taiwan

ISBN: (纸本)9780769536361

In recent years, there has been an increase in video surveillance systems in public and private environments due to a heightened sense of security. the next generation of surveillance systems will be able to annotate video and locally coordinate the tracking of objects while multiplexing hundreds of video streams in real-time. In this paper we present OmniEye, a wireless distributed real-time surveillance system composed of wireless smart cameras. OmniEye is comprised of custom-designed smart camera nodes called DSPcams that communicate using an ieee 802.11 mesh network. these cameras provide wide-area coverage and local processing with the ability to direct a sparse number of high-resolution pan, tilt and zoom (PTZ) cameras that can home onto targets of interest. Each DSPcam performs local processing to help classify events and pro-actively draw ail operator's attention when. necessary. In video-streaming applications, maintaining high network utilization is required in order to maximize image quality as well as the number of cameras. Our experiments show that by using the standard 802.11 DCF MAC protocol for communication, the system does not scale beyond 5-6 cameras while each camera is streaming at 1 Mbps. Also, we see high levels of jitter in video transmissions. this Performance degrades further for multi-hop scenarios due to the presence of hidden nodes. In order to improve the system's scalability and reliability, we propose a Tune-Synchronized Application-level MAC protocol (TSAM) capable of operating on top of existing 802.11 protocols using commodity off-the-shelf hardware. through analysis and experimental validation, we show how TSAM is able to improve throughput and provide bounded delay. Unlike traditional CSMA-based systems, TSAM gracefully degrades in a fair manner so that existing streams can still deliver data.

关键词： Cameras

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the 8th international workshop on performance modeling, evaluation, and optimization of ubiquitous computing and networked systems (PMEO-UCNS'09)

IPDPS 2009 - Proceedings of the 2009 IEEE International Para...

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IPDPS 2009 - proceedings of the 2009 ieee International parallel and distributed processing symposium 2009年

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A parallel skeleton library for multi-core clusters

A parallel skeleton library for multi-core clusters

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38th International Conference on parallel processing, ICPP-2009

作者： Karasawa, Yuki Iwasaki, Hideya Department of Computer Science University of Electro-Communications 1-5-1 Chofugaoka Chofu Tokyo 182-8585 Japan

ISBN: (纸本)9780769538020

A parallel skeleton library is a collection of parallel computations that abstract generic and recurring patterns within parallel programs and conceal parallel behaviors as skeletons. It enables users to develop parallel programs as if they were sequential ones by composing suitable skeletons. However, many existing parallel skeleton libraries for distributed environments do not take into account the potential performance of multicore CPUs, because they operate under the premise that each node (computer) has a single-core CPU. To resolve this problem, this paper proposes the design and implementation of a parallel skeleton library for multi-core clusters. the proposed library adopts a two-stage dynamic task scheduling strategy;the first is among nodes and the second is among cores. this scheduling strategy enables the library to appropriately balance the load both between nodes and cores. the library also dynamically fuses successive skeleton calls to reduce the cost of control flows and increase the locality of data. the proposed skeletons are implemented from scratch for matrices within a parallel skeleton library called SkeTo by using the template techniques in C++ language. We confirmed that our implementation was efficient through various benchmarks. © 2009 ieee.

关键词： C++ (programming language)

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parallel Genetic Algorithms for Crystal Structure Prediction: Successes and Failures in Predicting Bicalutamide Polymorphs

Parallel Genetic Algorithms for Crystal Structure Prediction...

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5th International Conference on Intelligent Computing

作者： Ferraro, Marta B. Orendt, Anita M. Facelli, Julio C. Univ Utah Ctr High Performance Comp 155 S 1452 E Room 405 Salt Lake City UT 84112 USA Universidad de Buenos Facultad de Ciencias Exactas y Naturales Departamento de Fisica Buenos Aires DF Argentina Univ Utah Dept Biomed Informat Salt Lake City UT 84112 USA

ISBN: (纸本)9783642040696

this paper describes the application of our distributed computing framework for crystal structure prediction, Modified Genetic Algorithms for Crystal and Cluster Prediction (MGAC), to predict the crystal structure of the two known polymorphs of bicalutamide. the paper describes our success in finding the lower energy polymorph and the difficulties encountered in finding the second one. the results show that genetic algorithms are very effective in finding low energy crystal conformations, but unfortunately many of them are not plausible due to spurious effects introduced by the energy potential function used in the selection process. We propose to solve this by using a multi objective optimization GA approach, adding the unit cell volume as a second optimization target.

关键词： parallel genetic algorithms crystal structure prediction drug polymorphism

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