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International Symposium on Electronic Commerce and Security

作者： Ling Zhan Jiguang Wan Peng Gu Key Laboratory of Data Storage System School of Computer Science and Technology Huazhong University of Science and Technology Wuhan Hubei China School of Electrical Engineering and Computer Science University of Central Florida Orlando FL USA

ISBN: (纸本)9780769532585

As a result of the multimedia rapid growth, there has been a huge increase in the amount of information generated and shared by people all over the world. Demand for large-scale multimedia storage system is growing rapidly. This paper describes the design and implementation of the Two-level metadata server for distributed multimedia storage system (DMSS). The DMSS divides the logical view of the stored data from the physical view. The logical view is managed by the metadata server which is called GMS (global metadata server), and the physical view is managed by a component of storage servers which is called LMS (local metadata server). Adopting LMS, each storage server can maintain its own storage resources and metadata and data independently, and can offer storage service independently. The DMSS allows the application servers to access the storage servers directly and in parallel providing very high performance.

关键词： Servers Multimedia communication Multimedia systems Least squares approximation system performance File systems Heart beat

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An Optical External Localization system and Applications to Indoor Tracking

An Optical External Localization System and Applications to ...

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2008 IEEE/RSJ International Conference on Intelligent Robots and systems

作者： Linga Srujan Roy Binayak Harry Asada Daniela Rus Computer Science and Artifical Intelligence Laboratory MIT Anna University Cambridge MA USA Department of Mechanical Engineering MIT Arbeloff Laboratory for Information System and Technology Cambridge MA USA

Precise robot positioning is important for many applications in indoor environments. Current solutions to the indoor localization problem are either both unreliable and inaccurate, or very expensive. In this paper we propose, design and build a low-cost, robust and accurate indoor localization system using laser light sources. The system calculates the coordinates of a robotic arm by using triangulation algorithms with precisely measured values of the angles of the receiver with respect to the three laser emitters. A system of three rotating lasers and receiver unit was built and deployed in the wing of an aircraft. Using this system, a robotic arm could be localized accurately within error margins defined approximately by Gaussian distributions centered at the objectpsilas true coordinate values and with standard deviations of 0.19 mm, 0.11 mm and 0.34 mm in the x, y and z coordinate directions respectively. The system was also used to detect vertical drop in the robotic arm due to its weight as it extends to perform fitting operations on the skin of the wing. Feedback from the laser localization system was used to adjust the position of the tip of the robotic arm in order to perform a sequence of high precision docking tasks within the aircraft wing.

关键词： Receivers Measurement by laser beam Robots Robot kinematics Surface emitting lasers Laser beams Transmitters

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Stability of Hybrid Impulsive systems With Time Delays and Stochastic Effects

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IFAC Proceedings Volumes 2008年第2期41卷 5933-5938页

作者： Zhichun Yang Yiguang Hong Key Laboratory of Systems and Control Institute of Systems Science Chinese Academy of Sciences Beijing 100080 China Chongqing Key Lab of Operations Research and System Engineering Department of Mathematics and Computer Science Chongqing Normal University Chongqing 400047 China

In this paper, a class of hybrid impulsive systems with time delays and stochastic effects are considered. We obtain some criteria on the global exponential stability in mean square for the impulsive stochastic delayed systems. To do this, differential inequalities and ℒ-operator inequalities are developed. An example is given to illustrate the effectiveness of our results.

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Instruction level test for parallel multipliers

Instruction level test for parallel multipliers

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15th IEEE International Conference on Electronics, Circuits and systems, ICECS 2008

作者： Lin, Ma. Yan, Gao Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences P.O. Box 2704-25 Beijing 100190 China College of Electronics and Information Engineering Tongji University SiPing Road 1239 Shanghai 200092 China Graduate University of Chinese Academy of Science Beijing 100049 China

ISBN: (纸本)9781424421824

Multiplication operations are the normal operations in operating systems or scientific calculations. Multipliers embedded in processors, DSP or SoC are well optimized for best performance, and they are sensitive to test overhead. Instruction level test is a popular functional test approach for microprocessors test, and it can get satisfactory test results. But for the multipliers, one important part of microprocessors, there is no detail on how to testing them. This paper presents an instruction level test approach for the multiplier test. The proposed approach does not modify the multipliers and does not need any extra logic just using instructions of the processors to test processors' multipliers. Sequentially it does not have any test cost on area or timing. Moreover the instruction-level test is suited for at-speed test in nature. Experimental results on the real processor's circuits show that the instruction level test approach has good effect on parallel multipliers © 2008 IEEE.

关键词： system-on-chip

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Protection Architecture for Colorless DWDM Passive Optical Networks

Protection Architecture for Colorless DWDM Passive Optical N...

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IEEE PhotonicsGlobal@Singapore, IPGC

作者： Kwanil Lee Sang Bae Lee Joon-Young Kim Sil-Gu Mun Chang-Hee Lee Photonics Research Laboratory Intelligent System Division Korea Institute of Science and Technology Seoul South Korea Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

We propose novel colorless dense wavelength-division multiplexed passive optical networks (DWDM-PON) with a real-time protection capability against the fiber link fault. The feasibility of the proposed scheme is exper... 详细信息

关键词： Protection Wavelength division multiplexing Passive optical networks Optical network units Arrayed waveguide gratings Optical switches Optical fiber networks Optical fiber couplers Monitoring Optical control

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Channel Width Utilization Improvement in Testing NoC-Based systems for Test Time Reduction

Channel Width Utilization Improvement in Testing NoC-Based S...

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IEEE International Workshop on Electronic Design, Test and Applications (DELTA)

作者： Jia Li Qiang Xu Yu Hu Xiaowei Li Key Laboratory of Computer System and Architecture ICT CAS Beijing China Department of Computer Science & Engineering Chinese University of Hong Kong Hong Kong China Chinese Academy and Sciences Beijing China

Testing NoC-based systems mainly relies on reusing the Network-on-Chip architecture as the test access mechanism (TAM). This, however, implies that the core's test wrapper is supplied with full NoC channel width even if there is a mismatch between the two. How to effectively and efficiently make better utilization of the NoC channels for test data transferring is therefore an interesting and challenging problem. In this paper, we propose to combine a new wrapper design with interleaved test scheduling. Compared to [8], the proposed method can achieve better NoC channel utilization for test without manipulating test frequencies, which not only reduces test power, but also saves design effort for the test engineers. Consequently, the testing time of the NoC-based system is considerably reduced with the proposed technique (especially under stringent power constraints), as shown in the experimental results on circuits crafted from ITC02 benchmarks.

关键词： system testing Network-on-a-chip Circuit testing system-on-a-chip Electronic equipment testing Frequency Logic testing Clocks Application software Content addressable storage

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Advanced QoS methods for Grid workflows based on meta-negotiations and SLA-mappings

Advanced QoS methods for Grid workflows based on meta-negoti...

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Workshop on Workflows in Support of Large-Scale science, WORKS

作者： Ivona Brandic Dejan Music Schahram Dustdar Srikumar Venugopal Rajkumar Buyya Institute of Information Systems University of Technology Vienna Austria Grid Computing and Distributed System (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

In novel market-oriented resource sharing models, resource consumers pay for the resource usage and expect that non-functional requirements for the application execution, termed as quality of service (QoS), are satisfied. QoS is negotiated between two parties following the specific negotiation protocols and is recorded using service level agreements (SLAs). However, most of the existing work assumes that the communication partners know about the SLA negotiation protocols and about the SLA templates before entering the negotiation. However, this is a contradictory assumption, if we consider computational grids and novel, commercially oriented computing clouds where consumers and providers meet each other dynamically. In this paper, we present novel meta-negotiation and SLA-mapping solutions for grid workflows bridging the gap between current QoS models and grid workflows, one of the most successful grid programming paradigms. We illustrate the open research issues with a real world case study. Thereafter, we present document models for the specification of meta-negotiations and SLA-mappings. We discuss the architecture for the management of meta-negotiations and SLA-mappings as well as integration of the architecture into a grid workflow management framework.

关键词： Quality of service Protocols Grid computing Cloud computing Resource management Information systems Laboratories computer science Software engineering Application software

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On reducing both shift and capture power for scan-based testing

On reducing both shift and capture power for scan-based test...

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Asia and South Pacific Design Automation Conference

作者： Jia Li Qiang Xu Yu Hu Xiaowei Li Chinese Academy of Sciences Beijing China Department of Computer Science and Engineering Chinese University of Hong Kong Hong Kong China Key Laboratory of Computer System and Architecture ICT Chinese Academy and Sciences Beijing China

ISBN: (纸本)9781424419210

Power consumption in scan-based testing is a major concern nowadays. In this paper, we present a new X-fllling technique to reduce both shift power and capture power during scan tests, namely LSC-filling . The basic idea is to use as few as possible X-bits to keep the capture power under the peak power limit of the circuit under test (CUT), while using the remaining X-bits to reduce the shift power to cut down the CUT's average power consumption during scan tests as much as possible. In addition, by carefully selecting the X-filling order, our X-filling technique is able to achieve lower capture power when compared to existing methods. Experimental results on ISCAS'89 benchmark circuits show the effectiveness of the proposed methodology.

关键词： Circuit testing Energy consumption Power dissipation system testing Electrical fault detection Fault detection Circuit faults Benchmark testing Laboratories Power engineering computing

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On capture power-aware test data compression for scan-based testing 08

On capture power-aware test data compression for scan-based ...

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IEEE International Conference on computer-Aided Design

作者： Jia Li Xiao Liu Yubin Zhang Yu Hu Xiaowei Li Qiang Xu Chinese Academy and Sciences Beijing China CUhk REliable computing laboratory (CURE) Department of Computer Science & Engineering Chinese University of Hong Kong New Territories Hong Kong China Key Laboratory of Computer System and Architecture ICT CAS Beijing China

ISBN: (纸本)9781424428205

Large test data volume and high test power are two of the major concerns for the industry when testing large integrated circuits. With given test cubes in scan-based testing, the ldquodonpsilat-carerdquo bits can be exploited for test data compression and/or test power reduction. Prior work either targets only one of these two issues or considers to reduce test data volume and scan shift power together. In this paper, we propose a novel capture power-aware test compression scheme that is able to keep scan capture power under a safe limit with little loss in test compression ratio. Experimental results on benchmark circuits demonstrate the efficacy of the proposed approach.

关键词： Test data compression Circuit testing Integrated circuit testing system testing Benchmark testing Automatic testing Laboratories Power engineering computing Power system reliability Integrated circuit technology

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Distributed amplifier using enhancement-mode AlGaN/GaN HEMTs

Distributed amplifier using enhancement-mode AlGaN/GaN HEMTs

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International Conference on Communications, Circuits and systems (ICCCAS)

作者： Zhiqun Cheng Xiaopeng Zhou Kevin J. Chen Key laboratory of RF Circuit and System Hangzhou Dianzi University Hangzhou China Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Kowloon Hong Kong China

Distributed amplifiers (DAs) using 1mm-gate enhancement-mode AlGaN/GaN HEMT were designed and fabricated. Design process and simulation results of the DA are given. Simulation results show the input and output VSWR (voltage standing wave ratio) of less than 2, associated gain of more than 8.5dB and gain ripple of less than 1dB at frequency from 2GHz to 6GHz.

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