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ECS Transactions 2009年第1期18卷

作者： Yuanjiang Xie Xiang Fu Zijian He Yang Zhao Yu Hu Xiaowei Li Institute of Computing Technology Chinese Academy of Sciences Department of Computer Science and Engineering University of California Riverside Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences No. 6 Ke-Xue-Yuan South Road Beijing Beijing 100190 China

With increasing defect density, microprocessors, especially the embedded caches, will encounter more faults. Adding spare resources to replace defective components is a widely accepted method for yield enhancement. In this work, a repair method using content addressable memory combined with spare bits, as well as a novel fault injection method is proposed. With the proposed fault injection technique, various numbers and types of faults can be flexibly injected into the silicon. A wireless sensor network system using our self-repairable microprocessor (SRP) is developed to prove the effectiveness of the proposed technique.

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Energy efficient implementation of G.729 for wireless VoIP application 08

Energy efficient implementation of G.729 for wireless VoIP a...

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2008 International Conference on Advanced Infocomm technology, ICAIT '08

作者： Yao, Aihong Gu, Junjun Qu, Gang Bhattacharyya, Shuvra School of Computer Science and Technology and Institute for Computer Architecture Harbin Engineering University Harbin Heilongjiang China Electrical and Computer Engineering Department Institute for Advanced Computer Studies University of Maryland College Park MD United States

ISBN: (纸本)9781605580883

In this paper, we describe the formatting guidelines for ACM SIG Proceedings. Traditionally silence in VoIP applications is detected by a VAD algorithm after G.729 compression, both have high computational and energy cost. However, such cost on silence frames will be completely wasted because the detected silence frames will not be sent to receiver. We propose to use a silence pre-detection (SPD) module to detect silence frames directly from the voice sample in order to reduce energy. Our adaptive SPD algorithm has little hardware requirement and low computation cost. However, it can detect 59% of the silence, which results in 34% energy saving. The impact to quality of speech is almost unnoticeable. Copyright © 2008 ACM.

关键词： Energy efficiency

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Minimizing point-to-point transmission energy with error correction coding and transmission power control 08

Minimizing point-to-point transmission energy with error cor...

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2008 International Conference on Advanced Infocomm technology, ICAIT '08

作者： Gu, Junjun Qu, Gang Yao, Aihong Bouridane, Ahmed Electrical and Computer Engineering Department Institute for Advanced Computer Studies University of Maryland College Park MD United States School of Computer Science and Technology Institute for Computer Architecture Harbin Engineering University Harbin Heilongjiang China School of Computer Science Institute of Electronics Communications and Information Technology Queen's University of Belfast Belfast United Kingdom

ISBN: (纸本)9781605580883

Energy efficiency has become an important concern for the design of communication systems, particularly the wireless sensor networks where recharging battery might not be feasible. In this paper, we investigate how error correction coding (ECC) and transmission power level can impact the packet loss rate and transmission energy. We focus our analysis on the direct point-to-point communication, which is the basic unit for any data communication, in three popular scenarios: only one re-transmission is allowed;multiple re-transmissions are made to guarantee a given packet loss rate;and re-transmitting until the packet is received correctly. For each case, we derive formulas to show whether and when ECC and power control should be used. We then propose a 2-phase approach that uses ECC and power control simultaneously to reduce energy while maintaining the required packet loss rate. Numerical simulation validates our claims and indicates that the proposed 2-phase approach can reduce transmission energy significantly. Copyright © 2008 ACM.

关键词： Power control

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Innovating the future school: Collaborative planning & design process

Innovating the future school: Collaborative planning & desig...

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APMS 2008 Conference on Innovations in Networks

作者： Huhta, Esko Pöyry-Lassila, Päivi Teräväinen, Helena Staffans, Aija Smeds, Riitta Helsinki University of Technology Department of Computer Science and Engineering SimLab. Finland Department of Architecture Laboratory of Urban Planning and Design Finland

ISBN: (纸本)9789512295470

The purpose of this paper is to explore the collaborative planning and design process of an innovative future school. Our case study examined, modeled, and further developed this planning and design process aiming to create a more wide-ranging place and space for learning than a mere school building We wanted to find out what kind of collaboration and network management would support the participatory planning and design process, and how it would be possible to make children's and youth's opinions visible and to accomplish collaboration in the design process. The case data was collected from a SimLab™ simulation project and architecture workshops. Our findings indicate that that the process of planning and designing innovative future schools require seamless collaboration between various actors and stakeholders, such as architects, pedagogy experts, future school users, and municipal decision makers. Furthermore, the network management aspect should be taken into account to make the collaborative design process more fruitful. Especially, the role of boundary objects was observed to be important both for supporting collaboration and participation in the design process, and for making children 's and youth's opinions visible.

关键词： Network management

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A study on wave response and evaluation of habitability of floating restaurant

A study on wave response and evaluation of habitability of f...

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27th International Conference on Offshore Mechanics and Arctic Engineering, OMAE 2008

作者： Eto, Hiroaki Saijo, Osamu Maruyoshi, Koichi Department of Electronics and Computer Science College of Science and Technology Nihon University Chiba Japan Department of Oceanic Architecture and Engineering College of Science and Technology Nihon University Chiba Japan Wiz Structural Design Office Tokyo Japan

ISBN: (纸本)9780791848234

Since Japan is limited in area, the effective ocean space development is very important and urgent subject. Concerning a research and development of effective ocean space utilization, the MEGA-FLOAT was one of the most famous projects in Japan that had the purpose of a floating airport construction, and the numerous R & D were conducted aiming at actual construction and those results were reported in respect of conceptual design, construction method, fluid analysis, structural dynamic analysis, environment issue etc.. However, the end was faced without achieving it, it can be said that the effect is large. After the end of that project, the realistic, small or medium size structure began to be paid to attention. As the good example of such a kind floating structure, floating pier and disaster prevention base having an advantage against an(Figure Presented) earthquake, floating restaurant etc. were constructed shown in Figure 1. In this paper, assuming the small size floating restaurant, the wave response analysis was studied, and the habitability of that structure was evaluated from the response calculation results. Concretely, the floating base part;barge type of the restaurant building was designed by the Class NK (Rules and Guidance for the survey and construction of steel ships. Part Q Steel barges). The calculation model consists of a three-story building and the base, that floating artificial base supporting the building was assumed by the elastic plate structural system, and also that building was of the frame structure system. In order to structural analysis, the restaurant model of two different structural systems was united into one body system. In this paper, it is called the hybrid structural system. Fluid effect was analyzed as the fluid-structural interaction problem. Concretely, the Boundary Integral Equation Method (BIEM) was used here, and the wave response calculation was demonstrated by that forces. The evaluation of habitability of the restaurant

关键词： Structural analysis

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Fast slide mark compact algorithm

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Tien Tzu Hsueh Pao/Acta Electronica Sinica 2008年第10期36卷 1955-1960页

作者： Zou, Qiong Zhang, Long-Bing Department of Computer Science and Technology University of Science and Technology of China Hefei 230027 China Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China

Allocation order is the best for locality, which slide mark compact algorithm is based on. But traditional design made the algorithm's overhead too large. We proposed a fast slide mark compact algorithm, which reduces the overhead by mark bit table, live block pool and offset table. The results show that it achieves up to 8.9% speedup in industry-standard benchmark SPEC JVM98 on the Pentium 4, 11% improvement in dtlb miss numbers and 13.6% reduce with L2 cache miss numbers.

关键词： Garbage collection Live block pool Mark bit table Mark compact Offset table

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AER filtering using GLIDER: VHDL cellular automata description

AER filtering using GLIDER: VHDL cellular automata descripti...

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IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： A. Linares-Barranco J.L. Sevillano M. S. Obaidat N. Ferrando J. Cerda D. Cascado G. Jimenez A. Civit Department of Computer Architecture and Technology University of Seville Spain Computer Science Department Monmouth University NJ USA Department of Electronic Engineering Technical University of Valencia Spain

Cellular automata (CA) is a bio-inspired processing model for problem solving, initially proposed by Von Neumann. This approach modularizes the processing by dividing the solution into synchronous cells that change their states at the same time in order to get the solution. The communication between them is crucial to achieve the correct solution. On the other hand, the address-event-representation (AER) is a neuromorphic communication protocol for transferring asynchronous events between VLSI chips. These neuro-inspired implementations have been used to design sensor chips (retina, cochleas), processing chips (convolutions, filters) and learning chips, which makes it possible to develop complex, multilayer, multichip neuromorphic systems. This paper presents the fusion of both bio-inspired solutions for implementing a vision filter based on 3times3 convolutions. The GLIDER software tool for developing CA has been used to implement the filter in VHDL and synthesize it into the Spartan II 200 of the USB-AER.

关键词： Filtering Filters Neuromorphics Problem-solving Protocols Very large scale integration Biosensors Sensor systems Retina Nonhomogeneous media

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Minimising the delta test for variable selection in regression problems

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International Journal of High Performance Systems architecture 2008年第4期1卷 269-281页

作者： Guillén, Alberto Sovilj, Dušan Lendasse, Amaury Mateo, Fernando Rojas, Ignacio Department of Informatics University of Jaén Campus Las Lagunillas 23071 Ján Spain Department of Information and Computer Science Helsinki University of Technology P.O. Box 5400 FI-02015 HUT Helsinki Finland Institute of Applications of Information Technology and Advanced Communications Polytechnic University of Valencia Camino de Vera s/n 46022 Valencia Spain Department of Computer Architecture and Technology University of Granada Periodista Daniel Saucedo s/n 18071 Granada Spain

The problem of selecting an adequate set of variables from a given data set of a sampled function becomes crucial by the time of designing the model that will approximate it. Several approaches have been presented in the literature although recent studies showed how the delta test is a powerful tool to determine if a subset of variables is correct. This paper presents new methodologies based on the delta test such as tabu search, genetic algorithms and the hybridisation of them, to determine a subset of variables which is representative of a function. The paper considers as well the scaling problem where a relevance value is assigned to each variable. The new algorithms were adapted to be run in parallel architectures so better performances could be obtained in a small amount of time, presenting great robustness and scalability. Copyright © 2008, Inderscience Publishers.

关键词： Genetic algorithms

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Capacity-shared heterogeneous CMP cache

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Jisuanji Yanjiu yu Fazhan/computer Research and Development 2008年第5期45卷 877-885页

作者： Gao, Xiang Zhang, Longbing Hu, Weiwu Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China Department of Computer Science and Technology University of Science and Technology of China Hefei 230027 China

The characteristics of advanced integrated circuit technologies require architects to look for new ways to utilize large numbers of gates and mitigate the effects of high interconnect delays. Chip multiprocessors (CMPs) exploit increasing transistor counts by placing multiple processors on a single die. As the chip multiprocessors (CMPs) have become the trend of high performance microprocessors, the target workloads become more and more diversified. Due to the wire delay problem and diversity of applications, neither private nor shared caches can provide both large capacity and fast access in CMPs. A novel CMP cache design, the heterogeneous CMP cache (HCC) is presented, in which chips are constructed by tiles of two different categories. L2 caches of private tiles provide lowest hit latency and L2 cache of shared tiles increases the effective cache capacity for shared data. Incorporating indirect-index cache technology to share capacity between different hierarchies, HCC provide a both capacity-effective and access-fast on-chip memory subsystem. Detailed full-system simulations are used to analyze the HCC performance for various programs, including SPEC CPU2000, SPLASH2 and commercial workloads. The result shows that HCC improves performance by 16% for single-threaded benchmarks and 9% for multi-thread benchmarks. HCC is easy to implement and the design ideas will be used in the future multi-core processors of Godson series.

关键词： Microprocessor chips

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Influence of parameters on the performance of a MOACO algorithm for solving the bi-criteria military path-finding problem

Influence of parameters on the performance of a MOACO algori...

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Congress on Evolutionary Computation

作者： A.M. Mora J.J. Merelo P.A. Castillo J.L.J. Laredo C. Cotta Department of Architecture and Computer Technology ETSIIT University of Granada Spain Department of Languages and Computer Science University of Màlaga Spain

This paper presents a statistical parameter analysis of the ant colony optimization algorithm that was implemented to solve the bi-criteria military path-finding problem. Three parameters have been studied using analysis of variance (ANOVA) in order to identify their influence in the results and the most suitable values for them: number of ants, number of iterations and exploration/exploitation factor. In addition, a mean analysis has been performed in order to complete the conclusions obtained. The study has yielded optimal values for the parameters under study, and some internal relationships between them have been identified.

关键词： Analysis of variance Equations Algorithm design and analysis Statistical analysis Chemical reactors Ant colony optimization Image color analysis

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