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检索条件"机构=Service Computing Technology and System Key Laboratory"

共 2401 条记录，以下是2031-2040 订阅

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On Selection of Testable Paths with Specified Lengths for Faster-Than-At-Speed Testing

On Selection of Testable Paths with Specified Lengths for Fa...

引用

2010 19th IEEE Asian Test Symposium(第19届IEEE亚洲测试技术学术会议 ATS 2010)

作者： Xiang Fu Xiaowei Li Huawei Li Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Acade Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Acade

Faster than at-speed testing provides an effective way to detect small delay defects (SDDs). It requires test patterns to be delicately classified into groups according to the delay of sensitized paths. Each group of patterns is applied at certain frequency. In this paper, we propose to generate tests for faster than at-speed testing using path delay fault (PDF) model and single path sensitization criterion. An effective path selection and grouping method is introduced, which could quickly and accurately identify paths whose delay falls into a given delay span. Several techniques are used to improve the efficiency of the testable path selection procedure. Experimental results on ISCAS'89 benchmark circuits show that the proposed method could achieve high transition fault coverage and high test quality of SDDs with low CPU time.

关键词： faster-than at-speed testing testable path selection small delay defect

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Vehicle to Vehicle and Roadside Sensor Communication for Intelligent Navigation

Vehicle to Vehicle and Roadside Sensor Communication for Int...

引用

International Conference on Wireless Communications, Networking and Mobile computing (WiCom)

作者： Rongyan Xia Chen Ye Dongdong Zhang Key Laboratory of Embedded System and Service Computing University of Tongji Shanghai China

Hybrid sensor network technology is a key component of future ITS applications. In this paper, we propose a hybrid architecture that combined VANETs and roadside WSNs for intelligent navigation. Different from traditional ITS application, Sensors in WSNs and VANETs are used to perceive and exchange roadside and vehicular information to support the intelligent navigating decision process. We firstly give the system and protocol architecture, and then we discuss the scenarios and use cases of our system in intelligent navigation. After that, we describe the software and hardware implementation of our prototype, conduct a simulation on the discussed scenarios, and present a detailed data communication experimental result to prove the feasibility of our prototype.

关键词： Vehicles Wireless sensor networks Navigation Data communication Roads Prototypes Path planning

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An Efficient Algorithm for Finding a Universal Set of Testable Long Paths

An Efficient Algorithm for Finding a Universal Set of Testab...

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2010 19th IEEE Asian Test Symposium(第19届IEEE亚洲测试技术学术会议 ATS 2010)

作者： Zijian He Tao Lv Xiaowei Li Huawei Li Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academ Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academ

In this paper, we focus on generation of a universal path candidate set V that contains testable long paths for delay testing. Some strategies are presented to speed up the depth first search procedure of U generation, targeting the reduction of sensitization criteria checking times. Experimental results illustrate that our approach achieves an 8X speedup on average in comparison with the traditional depth first search approach.

关键词： delay testing testable long paths

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On-the-fly Reduction of Stimuli for Functional Verification

On-the-fly Reduction of Stimuli for Functional Verification

引用

2010 19th IEEE Asian Test Symposium(第19届IEEE亚洲测试技术学术会议 ATS 2010)

作者： Qi Guo Weiwu Hu Tianshi Chen Haihua Shen Yunji Chen Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Acade Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Acade

As a primary method for functional verification of microprocessors, simulation-based verification has received extensive studies over the last decade. Most investigations have been dedicated to the generation of stimuli (test cases), while relatively few has focused on explicitly reducing the redundant stimuli among the generated ones. In this paper, we propose an on-the-fly approach for reducing the stimuli redundancy based on machine learning techniques, which can learn from new knowledge in every cycle of simulation-based verification. Our approach can be easily embedded in traditional framework of simulation-based functional verification, and the experiments on an industrial microprocessor have validated that the approach is effective and efficient.

关键词： Functional Verification Stimuli Reduction Redundancy Online Learning Godson-2

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Local-directed network coding in vehicular ad-hoc networks

Local-directed network coding in vehicular ad-hoc networks

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

作者： Haojie Luo Dongdong Zhang Chen Ye The Key Laboratory of Embedded System and Service Computing Tongji University Shanghai China

In this paper, we proposed a novel network coding method called local-directed network coding to improve the throughput of the vehicular ad-hoc network. Different from other vehicular network coding methods, we consider the direction of packet transmission. In detail, the intermediate node selects one main packet and some sub-packets from forwards and backwards sending queues, and then encodes these packets into one packet to broadcast. Simulation results show that our approach can efficiently improve the throughput of application layer in vehicular networks.

关键词： Encoding Buffer storage Accidents Vehicles Streaming media Artificial neural networks Performance evaluation

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An Improved Foreground Object Detection Method Based on Gaussian Mixture Models

An Improved Foreground Object Detection Method Based on Gaus...

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International Conference on Multimedia Communications (Mediacom)

作者： Xiayi Zhang Fuqiang Liu Zhipeng Li Key Laboratory of Embedded System and Service Computing University of Tongji Shanghai China

Statistical background subtraction has proved to be a robust and effective approach for segmenting and extracting objects without any prior information of the foreground objects. This paper presents two contributions on this topic. The first contribution of this paper proposes a novel approach which introduces the motion mask into the Gaussian Mixture Models to reduce the errors of classical GMMs, which always classifies the moving objects as background incorrectly, and affects the accuracy of the steps followed by, when the objects are still in long periods. The second contribution regards the connected component labeling based on the contour tracking algorithm. Experimental results validate the effectiveness of the proposed approach.

关键词： Pixel Labeling Proposals Noise Adaptation model Video sequences Real time systems

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Incremental Sensor Node Deployment for Low Cost and Highly Available WSNs

Incremental Sensor Node Deployment for Low Cost and Highly A...

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International Conference on Mobile Ad-hoc and Sensor Networks, MSN

作者： Safwan Al-Omari Weisong Shi Jordan University of Science and Technology Jordan Key Laboratory of Embedded System and Service Computing University of Tongji China

We attack the sensor network deployment problem. We define the deployment problem as the problem of deciding how many sensor nodes should be deployed in the sensor field over how many phases during its lifetime. We target the optimal deployment strategy that meets user-defined availability requirement with minimum total cost taking into consideration node failures and changing field trip to sensor node cost ratio. We model WSN availability and total cost as functions of the deployment plan, then, we formalize the deployment problem as a 2D optimization problem. Our modeling enables us to explore cost-benefit tradeoffs, we believe, this is a solid step toward bringing cost as an explicit dimension in the design space of WSN protocols. We compare the performance of the optimized solution (denoted as pro-active) to more ad-hoc solutions: on-demand and at-front. The former strategy schedules future deployments only on demand. The latter strategy deploys all nodes at front with no later field trips. Using extensive simulations, we show that proactive outperforms at-front and on-demand in terms of total cost per availability unit in all application scenarios. For example, using pro-active costs $7 compared to $40 and $280 per total uptime in case of on-demand and at-front, respectively.

关键词： Availability Wireless sensor networks Equations Optimization Mathematical model Business Exponential distribution

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Multicast capacity scaling for cognitive networks: General extended primary network

Multicast capacity scaling for cognitive networks: General e...

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2010 IEEE 7th International Conference on Mobile Adhoc and Sensor systems, MASS 2010

作者： Wang, Cheng Li, Xiang-Yang Tang, Shaojie Jiang, Changjun Department of Computer Science Tongji University Shanghai China Key Laboratory of Embedded System and Service Computing Ministry of Education Shanghai China Tsinghua National Laboratory for Information Science and Technology Tsinghua University Beijing China Department of Computer Science Illinois Institute of Technology Chicago IL 60616 United States

ISBN: (纸本)9781424474882

We study the capacity scaling laws for the cognitive network that consists of the primary hybrid network (PhN) and secondary ad hoc network (SaN). PhN is further comprised of an ad hoc network and a base station based (BS-based) network. SaN and PhN are overlapping in the same deployment region, operate on the same spectrum, but are independent with each other in terms of communication requirements. The primary users (PUs), i.e., the ad hoc nodes in PhN, have the priority to access the spectrum. The secondary users (SUs), i.e., the ad hoc nodes in SaN, are equipped with cognitive radios, and have the functionalities to sense the idle spectrum and obtain the necessary information of primary nodes in PhN. We assume that PhN adopts one out of three classical types of strategies, i.e., pure ad hoc strategy, BS-based strategy, and hybrid strategy. We aim to directly derive multicast capacity for SaN to unify the unicast and broadcast capacity under two basic principles: (1) The throughput for PhN cannot be undermined in order sense due to the presence of SaN. (2) The protocol adopted by PhN does not alter in the interest of SaN, anyway. Depending on which type of strategy is adopted in PhN, we design the optimal-throughput strategy for SaN. We show that there exists a threshold of the density of SUs according to the density of PUs beyond which it can be proven that: (1) when PhN adopts the pure ad hoc strategy or hybrid strategy, SaN can achieve the multicast capacity of the same order as it is stand-alone;(2) when PhN adopts the BS-based strategy, SaN can asymptotically achieve the multicast capacity of the same order as if PhN were absent, if some conditions of the relations among the number of SUs, PUs, the destinations of each multicast sessions in SaN, and the base stations in PhN hold. ©2010 IEEE.

关键词： Base stations

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Testable critical path selection considering process variation

Testable critical path selection considering process variati...

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作者： Fu, Xiang Li, Huawei Li, Xiaowei Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academic of Science Beijing 100190 China Graduate University of Chinese Academic of Sciences Beijing 100039 China

Critical path selection is very important in delay testing. Critical paths found by conventional static timing analysis (STA) tools are inadequate to represent the real timing of the circuit, since neither the testability of paths nor the statistical variation of cell delays caused by process variation is considered. This paper proposed a novel path selection method considering process variation. The circuit is firstly simplified by eliminating non-critical edges under statistical timing model, and then divided into sub-circuits, while each sub-circuit has only one prime input (PI) and one prime output (PO). Critical paths are selected only in critical sub-circuits. The concept of partially critical edges (PCEs) and completely critical edges (CCEs) are introduced to speed up the path selection procedure. Two path selection strategies are also presented to search for a testable critical path set to cover all the critical edges. The experimental results showed that the proposed circuit division approach is efficient in path number reduction, and PCEs and CCEs play an important role as a guideline during path selection. Copyright © 2010 The Institute of Electronics.

关键词： Delay circuits

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A new watermarking algorithm based on DCT and DWT fusion

A new watermarking algorithm based on DCT and DWT fusion

引用

International Conference on Electrical and Control Engineering, ICECE 2010

作者： Wang, Huai-Bin Yang, Hong-Liang Wang, Chun-Dong Wang, Shao-Ming Key Laboratory of Computer Vision and System Ministry of Education Tianjin University of Technology 300191 Tianjin China Tianjin Key Laboratory of Intelligence Computing and Novel Software Technology Tianjin University of Technology 300191 Tianjin China College of Information Sciences Beijing Language and Culture 100083 Beijing China

ISBN: (纸本)9780769540313

In this paper a new blind watermarking algorithm based on DCT (discrete cosine transform) and DWT (discrete wavelet transform) was proposed. In order to enhance the security of watermarking, Arnold transform is carried out on the watermark image. Firstly discrete wavelet transform is carried out on the host image three times. Secondly the low resolution sub-image of DWT (LL3) is divided in to 8*8 blocks and then discrete cosine transform is carried out on the blocks. At last the middle frequency coefficients of the blocks are selected to embed the watermark image. In term of traditional algorithm the experiment results show that the new algorithm keeps the quality of host image well and a high robustness against common attacks such as JPEG compression, additive Gaussian noise, image rotation, image cropping and so on. © 2010 IEEE.

关键词： Discrete wavelet transforms

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