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检索条件"机构=Key Lab. of System Software and State Key Lab. of Computer Science"

共 834 条记录，以下是131-140 订阅

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A method for avoiding the feedback searching bias in ant colony optimization

A method for avoiding the feedback searching bias in ant col...

引用

3rd International Conference on Swarm Intelligence, ICSI 2012

作者： Chen, Bolun Chen, Ling Department of Computer Science Yangzhou University Yangzhou 225127 China State Key Lab. of Novel Software Tech. Nanjing University Nanjing 210093 China

ISBN: (纸本)9783642309755

One of the obstacles in applying ant colony optimization (ACO) to the combinatorial optimization is that the search process is sometimes biased by algorithm features such as the pheromone model and the solution construction process. Due to such searching bias, ant colony optimization cannot converge to the optimal solution for some problems. In this paper, we define a new type of searching bias in ACO named feedback bias taking the k-cardinality tree problem as the test instance. We also present a method for avoiding the feedback searching bias. Convergence analysis of our method is also given. Experimental results confirm the correctness of our analysis and show that our method can effectively avoid the searching bias and can ensure the convergence for the problem. © 2012 Springer-Verlag.

关键词： Ant colony optimization

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Image structure adaptive gradient vector flow for active contours

Image structure adaptive gradient vector flow for active con...

引用

2009 International Conference on Information Engineering and computer science, ICIECS 2009

作者： Li, Kun Wang, Yuanquan Tianjin Key Lab. of Intelligent Computing and Novel Software Technology School of Computer Science Tianjin University of Technology Tianjin 300191 China

ISBN: (纸本)9781424449941

The gradient vector flow (GVF) is an effective external force for active contours, but it's smoothness constraint doesn't take any image structure into account and the resulting diffusion equation is isotropic which would oversmooth weak edges. In this article, a novel external force named image structure adaptive gradient vector flow (ISAGVF) is proposed for active contours. The proposed ISAGVF employs certain smoothness constraint which is able to be adaptive to image structure, such that the ISAGVF snake would outperform the GVF snake in terms of noise robustness, weak edge preserving and narrow and deep concavity convergence, while possessing some other desirable properties such as enlarged capture range and insensitivity to initialization. Experiments on synthetic and real images manifest these properties of ISAGVF snake. ©2009 IEEE.

关键词： Tensors

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High speed architecture of arithmetic coder

High speed architecture of arithmetic coder

引用

IEEE International Conference on computer science and Automation Engineering (CSAE)

作者： Liu, Kai Xu, Chao School of Computer Science and Technology Xidian University Xi'an 710071 China State Key Lab. for Novel Software Technology Nanjing University Nanjing 210093 China

ISBN: (纸本)9781424487257

A high speed arithmetic coder architecture is proposed in this paper. An out-of-order execution mechanism for different types of context is used that can allocate the context symbol to the idle arithmetic coding core with a different order compared with the input order. For the balance of the input rate of contexts, in one arithmetic coder, there exist N cores for processing different contexts, where N is the number of context type. Furthermore, the same bit detection (SBD) circuit is used for unrolling the renormalization stage of arithmetic coding. Moreover, because of time consuming for underflowing, a dedicated circuit is designed to unrolling the internal loop which can process underflowing situation in a few clock cycles. Experimental results demonstrate that the proposed architecture attains a throughput of 375.50 MCPS (Mega Contexts per Second) at its maximum based on field programmable gate arrays (FPGAs). © 2011 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Active BSVM learning for relevance feedback in content-based sketch retrieval

Active BSVM learning for relevance feedback in content-based...

引用

5th IASTED International Conference on Signal Processing, Pattern Recognition, and Applications, SPPRA 2008

作者： Liang, Shuang Sun, Zhengxing State Key Lab. for Novel Software Technology Nanjing University Nanjing 210093 China Department of Computer Science and Technology Nanjing University Nanjing 210093 China

ISBN: (纸本)9780889867178

The availab.lity of relevance feedback is held back by the problem of the imbalance and limited size of lab.led training data, as well as the real-time requirement of online interaction demands. In this paper, we propose a relevance feedback algorithm called active biased SVM (BSVM) learning, in which biased classification and active learning are employed to address these difficulties. The algorithm is applied to content-based sketch retrieval (CBSR), and the experiments prove both the effectiveness and efficiency of the proposed approach.

关键词： Active learning Biased SVM (BSVM) Content-based sketch retrieval (CBSR) Relevance feedback

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Research and implementation on Web Image Cleaning

Research and implementation on Web Image Cleaning

引用

2002 IEEE International Conference on systems, Man and Cybernetics

作者： Zheng, Gang Wang, Ji-Cheng Zhou, Yuan Yuan Zhang, Fu-Yan Stt. Key Lab. Novell Software T. Department of Computer Science Nanjing University Nanjing Jiangsu 210093 China

For special purposes such as improving accuracy of Web image retrieval and indexing, it is worth dwelling on how to separate different types of images from Web pages. In this paper, we put forward the concept of Web Image Cleaning and propose an approach of Web Image Cleaning based on decision tree to process images of four classes, Content, Decoration, Advertisement and lab.l. This paper explores a new text feature of Ascription in feature selection to represent the occurrence of particular words and phrases in href and src attributes of an image tag. Furthermore, feature extraction is performed on DOM (Document Object Model) tree of Web documents. Series of experiments showed that the approach applied to Web Image Cleaning system - WICleaner is practical, speedy and accurate, with average cleaning rate of10 26 images /second and overall cleaning accuracy of 86%. If used in detecting content image, overall detecting accuracy of the system is 94.8%, which is an improvement of approximately 10% over existing image classifiers.

关键词： World Wide Web

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Web opinion mining based on sentiment phrase classification vector

Web opinion mining based on sentiment phrase classification ...

引用

2010 2nd IEEE International Conference on Network Infrastructure and Digital Content, IC-NIDC 2010

作者： Han, Pengcheng Du, Junping Chen, Liping Beijing Key Lab. of Intelligent Telecommunication Software and Multimedia School of Computer Science Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9781424468546

Opinion mining is an important research area of web data mining. As it is related to natural language process and data mining, opinion mining is very challenging. This paper presents a web opining mining algorithm based on sentiment phrase classification vector. By the techniques of sentiment phrase classification, the algorithm compares the similarity between document vectors, mines the theme of the document and judges the document theme attributes. The experimental results show that the algorithm has better effectiveness and practicality. ©2010 IEEE.

关键词： Vectors

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Test case generation based on program invariant and adaptive random algorithm

Test case generation based on program invariant and adaptive...

引用

2011 International Conference on computer science and Education, CSE 2011

作者： Yuan, Yuan Fanping, Zeng Guanmiao, Zhu Chaoqiang, Deng Neng, Xiong Department of Computer University of Science and Technology of China China Anhui Province Key Lab. of Software in Computing and Communication Hefei Anhui China

ISBN: (纸本)9783642224171

Testing is a critical activity to find software errors. And choosing an effective test suite is the key problem in software testing area. Program invariant, as an attribute of program, can record the implementation state of test case very well and reveal the coverage of program data. In this paper, we integrate adaptive random testing and invariant technology, and present a new method which makes full use of the feedback information of program invariant and invalid case suite to generate the next case. Experiment results show that, compared with other similar methods, running for the same time, our method can achieve higher coverage and faster convergence speed. © 2011 Springer-Verlag.

关键词： software testing

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A simulative platform that evaluates the energy save rate of the street lamp system based on JiST/STRAW

A simulative platform that evaluates the energy save rate of...

引用

1st International Conference on Instrumentation and Measurement, computer, Communication and Control, IMCCC2011

作者： Yang, Tao Wang, Yinyang Xiong, Hu Yu, Liangwen Deng, Yong Hu, Jianbin Chen, Zhong School of Electronics Engineering and Computer Science Peking University Beijing 100871 China MoE Key Lab. of High Confidence Software Technologies Peking University Beijing 100871 China MoE Key Lab. of Network and Software Assurance Peking University Beijing 100871 China

ISBN: (纸本)9780769545196

With the society's advocacy of "low-carbon energy-saving" way of life, saving energy has been a heated topic. Although the street lamp is an indispensable part of the basic facilities of a city, its large energy consumption at present has wasted a lot of natural resources. In order to solve this problem, many scientific researchers provide many solutions by using software or hardware methods to save energy. On account of the process of scientific research nowadays, we design a simulation platform that evaluates the energy consumption on the basis of JiST and STRAW. By using this platform we can analogy and contrast every proposal to choose the best solution. What's more, we design a system that controls the street lamp based on Agent. We modify the configuration and simulate every possible option to choose the best. © 2011 IEEE.

关键词： Energy utilization

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Pseudo trust: Zero-knowledge based authentication in anonymous peer-to-peer protocols

Pseudo trust: Zero-knowledge based authentication in anonymo...

引用

21st International Parallel and Distributed Processing Symposium, IPDPS 2007

作者： Lu, Li Han, Jinsong Hu, Lei Huai, Jinpeng Liu, Yunhao Ni, Lionel M. State Key Lab. of Information Security Graduate School Chinese Academy of Sciences Beijing China Dept. of Computer Science and Engineering Hong Kong University of Science and Technology Kowloon Hong Kong School of Computer Science Beihang University Beijing China State Key Lab. of Software Developing Environment Beihang University Beijing China

ISBN: (纸本)1424409101

Most of the current trust models in peer-to-peer (P2P) systems are identity based, which means that in order for one peer to trust another, it needs to know the other peer's identity. Hence, there exists an inherent tradeoff between trust and anonymity. To the best of our knowledge, there is currently no P2P protocol that provides complete mutual anonymity as well as authentication and trust management. We propose a zero-knowledge authentication scheme called Pseudo Trust (PT), where each peer, instead of using its real identity, generates an unforgeable and verifiable pseudonym using a one-way hash function. A novel authentication scheme based on Zero-Knowledge Proof is designed so peers can be authenticated without leaking any sensitive information. With the help of PT, most existing identity-based trust management schemes become applicable in mutual anonymous P2P systems. We analyze the levels of security and anonymity in PT, and evaluate its performance using trace-driven simulations and a prototype implementation. The strengths of Pseudo Trust include the lack of need for a centralized trusted party or CA, high scalab.lity and security, low traffic and cryptography processing overheads, and man-in-middle attack resistance. We aim for the Pseudo Trust design to be included in the P2P trust and anonymity context. © 2007 IEEE.

关键词： Distributed computer systems

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VLSP: Enabling location privacy in vehicular location based services

VLSP: Enabling location privacy in vehicular location based ...

引用

1st International Conference on Instrumentation and Measurement, computer, Communication and Control, IMCCC2011

作者： Yang, Tao Tang, Cong Yu, Liangwen Xin, Wei Deng, Yong Hu, Jianbin Chen, Zhong School of Electronics Engineering and Computer Science Peking University Beijing 100871 China MoE Key Lab. of High Confidence Software Technologies Peking University Beijing 100871 China MoE Key Lab. of Network and Software Assurance Peking University Beijing 100871 China

ISBN: (纸本)9780769545196

In this paper, we present VLSP, a Vehicular Location based Service with Privacy grantees. In VLSP, we assume the service provider is untrusted and users do not have pre-established social relationships with each other, we use standard cryptographic primitives, Broadcast Encryption (BE) and Attribute-based Encryption (ABE) to provide privacy guarantees. By using VLSP, we are able to protect users' location privacy in vehicular location sharing social services. VLSP is mainly composed with three parts: OBUs, RSUs, and vehicular location sharing service provider. RSUs use RFID readers to communicate with users' OBUs to log users' locations, and uses standard cryptographic primitives and BE-based mechanism to establish trust and protect privacy for users who share their location information. We leverage ABE-based mechanism on service provider to control who can see users' location information. We evaluate VLSP using protocol, security and system implementation analysis, and find VLSP is both privacy-preserving and feasible. © 2011 IEEE.

关键词： Location based services

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