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

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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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Study on ground test platform for space teleoperation based on multi-agent system

Study on ground test platform for space teleoperation based ...

引用

2009 4th IEEE Conference on Industrial Electronics and Applications, ICIEA 2009

作者： Zidi, Li Fuchun, Sun Huaping, Liu Yuji, Wang Fengge, Wu State Key Lab. of Intelligent Technology and System Dept. of Computer Science and Technology Tsinghua University Beijing China Beijing Institute of Oil Research Beijing China

ISBN: (纸本)9781424428007

Ground Test Platform for Space Teleoperation (GTPST) is a complicated distributed system consisted of multiple subsystems, and controlling it properly under large transmission delay is a huge challenge. Multi-agent system (MAS) is an effective method of solving distributed problems logically and physically, which has such merits as high adaptability, high reliability and easy to expand and maintain. The control model of GTPST is established based on MAS in this paper. Due to the limitation of the availab.e network bandwidth and the large time delay of satellite-ground links, we develop some applications based on mobile agent which can perform its execution locally on remote site, only return the final result or desired data back to local site. As no operation and communication between remote and local sites are needed during the execution of the mobile agent, valuable bandwidth can be reserved and saved. Meanwhile, communication protocols of MAS are improved and designed to increase the communication efficiency of the system. The availab.lity of the system is verified by the test the simulated service satellite (SSS) replaces cell unit for the simulated client satellite (SCS) finally. © 2009 IEEE.

关键词： Multi agent systems

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Energy-efficient real-time scheduling with accrual utility under energy bounds

Energy-efficient real-time scheduling with accrual utility u...

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作者： Han, Jian-Jun Wu, Xiaodong Huazhong University of Science and Technology China State Key Lab. for Novel Software Technology Nanjing University China

ISBN: (纸本)9780791802977

This paper presents an energy-efficient scheduling algorithm with accrual utility in battery-powered embedded systems. We propose our Two-Step Energy-Efficient Algorithm (TSEEA), which comprises two parts: a static algorithm, which runs offline and achieves the static execution frequencies of all tasks under conservative conditions;and a dynamic one, which strives to reclaim slack time and effectively tunes execution frequency of candidate task in a timely manner. Compared with other algorithms, our algorithm can fully exploit a supply of limited energy to yield more utility. The experiments validate our analytical results and demonstrate that the proposed algorithm outperforms other existing algorithms with respect to utility.

关键词： Scheduling algorithms

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A wavelet-domain structure similarity for image quality assessment

A wavelet-domain structure similarity for image quality asse...

引用

2009 2nd International Congress on Image and Signal Processing, CISP'09

作者： Lixiong, Liu Yuanquan, Wang Yuwei, Wu Beijing Lab. of Intelligent Information Technology School of Computer Science Beijing Institute of Technology Beijing China Tianjin Key Lab. of Intelligent Computing and Novel Software Technology Tianjin University of Technology Tianjin China

ISBN: (纸本)9781424441310

Recent studies have found that adoption of structure similarity index (SSIM) was successful in reflecting human visual characteristic better compared with traditional PSNR metrics. However this method shows some defects when evaluating the quality of blurred images and compressed degraded images at low bit rate. Good quality results were hardly achieved as they do not match the human vision system (HVS) well. This paper is to introduce a new image quality assessment algorithm based on wavelet-domain structure similarity (WDSSIM). The relative importance of the edge information under different scales is considered sufficiently in image quality assessment. The experimental results have demonstrated better consistency with the subjective perception for a large range of image types. ©2009 IEEE.

关键词： Image quality

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THUIR at TREC 2009 Web track: Finding relevant and diverse results for large scale Web Search

THUIR at TREC 2009 Web track: Finding relevant and diverse r...

引用

18th Text REtrieval Conference, TREC 2009

作者： Li, Z.C. Chen, F. Xing, Q.L. Miao, J.W. Xue, Y.F. Zhu, T. Zhou, B. Cen, R.W. Liu, Y.Q. Zhang, M. Jin, Y.J. Ma, S.P. State Key Lab. of Intelligent Technology and Systems Dept. of Computer Science and Technology Tsinghua University Beijing 10084 China

This is the 8th year that IR group of Tsinghua University (THUIR) participates in TREC. This year we focus on Web track, which contains two tasks, namely ad hoc and diversity. On ad hoc task, we improved the efficiency of our distributed retrieval system TMiner to handle terabytes of Web data. Then three studies have been done, namely page quality estimation, ranking feature analysis, and model comparison. On diversity task, we proposed several new approaches on searching strategy, user intention detection, and duplication elimination. To mine user's intention, we proposed and compared two different strategies, namely "searching + content-based diversity' which is a kind of result clustering, and "user based diverse intention prediction + searching' which is in the branch of query expansion.

关键词： Search engines

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An efficient image processing method based on web services for mobile devices

An efficient image processing method based on web services f...

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2009 2nd International Congress on Image and Signal Processing, CISP'09

作者： Yi, Liang Yingyuan, Xiao Jing, Huang Tianjin Key Lab. of Intelligent Computing and Novel Software Technology Tianjin University of Technology Tianjin China Key Laboratory of Computer Vision and System Ministry of Education Tianjin University of Technology Tianjin China

ISBN: (纸本)9781424441310

The resource limitation of mobile devices causes the problem that the existing image processing software based on the centralized computing mode had difficulty running in mobile devices. A solution is given in the paper by adopting web service-based image processing method. For one thing, image processing tasks were distributed to service providers' service registry and service requesters. For another, what the service providers should do was only to invocate the specific image processing services provided by service providers. Consequently, web service-based solution reduces the resource consumption of mobile devices by redistributing image processing tasks. Compared with traditional methods of image processing, Web service-based image processing method has the advantages of loose coupling and component oriented and can take full advantage of the computing resources in heterogeneous network. Thus web service-based image processing method can effectively solve the resource bottle-neck that traditional image processing software had. ©2009 IEEE.

关键词： Web services

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Research on method of object-oriented test cases generation based on UML and LTS

Research on method of object-oriented test cases generation ...

引用

1st International Conference on Information science and Engineering, ICISE2009

作者： Zeng, Fanping Chen, Zhide Cao, Qing Mao, Liangliang Department of Computer University of Science and Technology of China Hefei Anhui 230026 China Anhui Province Key Lab. of Software in Computer and Communication Hefei Anhui 230026 China

ISBN: (纸本)9780769538877

We present a novel method of Object-Oriented test case generation based on UML state diagrams and lab.l Transition system (LTS). The procedure is based on model-based testing techniques with test cases generated from UML state diagrams translated into LTS. UML state diagram can be a model of modeling software system. LTS model is an internal model to precisely represent the state transition. The examples and analysis show that our method is effective. ©2009 IEEE.

关键词： Model checking

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Constructing the Voronoi diagram of planar point set in parallel

Constructing the Voronoi diagram of planar point set in para...

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2009 International Conference on Computational Intelligence and software Engineering, CiSE 2009

作者： Dong, Lanfang Wu, Yuan Zhou, Shanhai Anhui Province Key Lab. of Software in Computing and Communication College of Computer Science and Technology USTC Hefei China College of Computer Science and Technology University of Science and Technology of China Hefei China

ISBN: (纸本)9781424445073

By researching Voronoi diagram, parallel algorithm, and divide-and-conquer method, we present a special data structure(change doubly-connected list little) for Voronoi diagram generation in parallel. In this paper we also present two proposal, they are one processor gradually to merge and 22-merger on the parallel machine, the experiment results show that the present algorithm runs faster than the serial program. By analyzing the various results, we should choose the most suitable number of processors according to the point set scale. At last, we can conclude that gradually merger with one processor is better proposal for Voronoi diagram parallel generation. ©2009 IEEE.

关键词： Parallel algorithms

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A phylogenetic tree constructing method based on ant colony partitioning

A phylogenetic tree constructing method based on ant colony ...

引用

1st International Conference on Information science and Engineering, ICISE2009

作者： Chen, Ling Qin, Ling Liu, Wei Chen, Bolun Department of Computer Science Yangzhou University Yangzhou China State Key Lab. of Novel Software Tech. Nanjing University Yangzhou China Department of Computer Science Nanjing University of Aeronautics and Astronautics Nanjing China

ISBN: (纸本)9780769538877

A new method for constructing phylogenetic trees from a given set of objects (proteins, species , etc.) is presented. The method bisects the set of gene sequences so that the sequences within one subset have most similarity, and the gene sequences between different subsets have most difference. Recursively repeating such bisecting until procedure until all the subsets contains only one gene sequence. With these subsets, a phylogenetic tree is progressively constructed where the leaves are the gene sequences. Each level of bisecting is based on an extension of ant colony optimization for traveling salesman problem. Experimental results show that our algorithm is easier to implement and more efficient. It can convergence faster and obtain higher quality results than other methods. ©2009 IEEE.

关键词： Ant colony optimization

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Incremental outlier detection in data streams using local correlation integral 09

Incremental outlier detection in data streams using local co...

引用

24th Annual ACM Symposium on Applied Computing, SAC 2009

作者： Lu, Xinjie Yang, Tian Liao, Zaifei Elahi, Manzoor Liu, Wei Wang, Hongan Graduate University Chinese Academy of Sciences Beijing China Institute of Software Chinese Academy of Sciences Beijing China State Key Lab. of Computer Science Institute of Software Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781605581668

In this paper, an incremental outlier detection technique capable of dealing with a large amount of data is presented and evaluated in the context of intrusion detection. The proposed method is based on the LOcal Correlation Integral (LOCI for short). The detection technique consists of two parts. The first part named insertion receives the sequence of input point and updates Multi-granularity DEviation Factor (MDEF) of the point at intervals. The second part named deletion deletes one or a batch of points. This technique is able to process streaming data in a single scan. Moreover, the number of updates in the incremental LOCI algorithm per insertion/deletion of a single data record does not depend on the total number of data records. Experimental results with real life data sets show that the technique is capable of dealing with data streams, successfully detecting outlier. Copyright 2009 ACM.

关键词： Intrusion detection

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