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

共 836 条记录，以下是41-50 订阅

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Constructing the robust and efficient small world overlay network for P2P systems

Constructing the robust and efficient small world overlay ne...

引用

3rd International Symposium on Parallel and Distributed Processing and Applications, ISPA 2005

作者： Feng, Guofu Mao, Ying-Chi Chen, Dao-Xu Department of Computer Science and Technology Nanjing University State Key Lab. for Novel Software Technology Nanjing Jiangsu 210093 China

ISBN: (纸本)3540297693

The current P2P application protocols are usually constructed over the application-level overlay network. However, because the users in the P2P systems always follow a very dynamic mode, the overlay network with poor performance will leads to the problem of connectivity - The departures of peers often break the network into plenty of small parts, and results in the resource islands. Although increasing the links between peers can enhance the performance of connectivity by information redundancy. But it will lead to the severe cost of maintenance. Then there is an urgent need to integrate the online peers as a "giant component" as large as possible, so that the resources online can be shared completely;at the same time to guarantee the cost of maintenance as little as possible. And due to the prevalence and significance of small world in reality and theory, in this paper we analyzed the correlation between the shortcuts density and the connectivity, as well as the impact of shortcuts density to robustness over the popular WS Small World model. At last, numerical simulation was done to confirm our analytic results. © Springer-Verlag Berlin Heidelberg 2005.

关键词： computer networks

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A simple probabilistic extension of modal Mu-calculus 24

A simple probabilistic extension of modal Mu-calculus

引用

24th International Joint Conference on Artificial Intelligence, IJCAI 2015

作者： Liu, Wanwei Song, Lei Wang, Ji Zhang, Lijun School of Computer Science National University of Defense Technology Changsha China University of Technology Sydney Australia State Key Lab. of HPC National University of Defense Technology Changsha China State Key Lab. of Computer Science Institute of Software CAS Beijing China

ISBN: (纸本)9781577357384

Probabilistic systems are an important theme in AI domain. As the specification language, PCTL is the most frequently used logic for reasoning about probabilistic properties. In this paper, we present a natural and succinct probabilistic extension of μ-calculus, another prominent logic in the concurrency theory. We study the relationship with PCTL. Surprisingly, the expressiveness is highly orthogonal with PCTL. The proposed logic captures some useful properties which cannot be expressed in PCTL. We investigate the model checking and satisfiability problem, and show that the model checking problem is in UP ∩co-UP, and the satisfiability checking can be decided via reducing into solving parity games. This is in contrast to PCTL as well, whose satisfiability checking is still an open problem.

关键词： Specification languages

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Video diver: Generic video indexing with diverse features

Video diver: Generic video indexing with diverse features

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International Multimedia Conference, MM'07 - 9th ACM SIG Multimedia International Workshop on Multimedia Information Retrieval, MIR'07

作者： Wang, Dong Liu, Xiaobing Luo, Linjie Li, Jianmin Zhang, Bo State Key Lab. of Intelligent Tech. and System Department of Computer Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)9781595937780

Semantic video indexing is critical for practical video retrieval systems and a generic and scalab.e indexing framework is a must for indexing a large semantic lexicon with over 1000 concepts present. This paper fully explores the idea of incorporating many kinds of diverse features into a single framework, combining them altogether to obtain larger degree of invariance which is absent in any of the component features, and thus achieves genericness and scalab.lity. We scale down the formidable computational expense with a clever design of the classification and fusion schemes. To be specific, ~20 kinds of diverse features are extracted to capture limited yet complementary variance in color, texture and edge with spatial constraints implicitly integrated, and over 100 classifiers are built subsequently and fused to produce a generic detector. The extensive experiments on a total of 310 hours of TRECVID news videos show that the proposed framework yields significantly improved performance over that of the best single feature across a variety of concepts. Moreover, a benchmark comparison demonstrates that this approach is state-of-the-art. Meanwhile, the proposed approach generalizes well over previously unseen programs and stations and scales well to a lexicon of over 300 concepts in the LSCOM [18] ontology. Copyright 2007 ACM.

关键词： Indexing (of information)

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Video search in concept subspace: A text-like paradigm 07

Video search in concept subspace: A text-like paradigm

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6th ACM International Conference on Image and Video Retrieval, CIVR 2007

作者： Li, Xirong Wang, Dong Li, Jianmin Zhang, Bo State Key Lab. of Intelligent Tech. and System Department of Computer Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)1595937331

Though both quantity and quality of semantic concept detection in video are continuously improving, it still remains unclear how to exploit these detected concepts as semantic indices in video search, given a specific query. In this paper, we tackle this problem and propose a video search framework which operates like searching text documents. Noteworthy for its adoption of the well-founded text search principles, this framework first selects a few related concepts for a given query, by employing a tf-idf like scheme, called c-tf-idf, to measure the informativeness of the concepts to this query. These selected concepts form a concept subspace. Then search can be conducted in this concept subspace, either by a Vector Model or a Language Model. Further, two algorithms, i.e., Linear Summation and Random Walk through Concept-Link, are explored to combine the concept search results and other baseline search results in a reranking scheme. This framework is both effective and efficient. Using a lexicon of 311 concepts from the LSCOM concept ontology, experiments conducted on the TRECVID 2006 search data set show that: when used solely, search within the concept subspace achieves the state-of-the-art concept search result;when used to rerank the baseline results, it can improve over the top 20 automatic search runs in TRECVID 2006 on average by approx. 20%, on the most significant one by approx. 50%, all within 180 milliseconds on a normal PC. Copyright 2007 ACM.

关键词： Semantics

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The importance of query-concept-mapping for automatic video retrieval

The importance of query-concept-mapping for automatic video ...

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15th ACM International Conference on Multimedia, MM'07

作者： Wang, Dong Li, Xirong Li, Jianmin Zhang, Bo State Key Lab. of Intelligent Tech. and System Department of Computer Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)9781595937025

A new video retrieval paradigm of query-by-concept emerges recently. However, it remains unclear how to exploit the detected concepts in retrieval given a multimedia query. In this paper, we point out that it is important to map the query to a few relevant concepts instead of search with all concepts. In addition, we show that solving this problem through both text and image inputs are effective for search, and it is possible to determine the number of related concepts by a language modeling approach. Experimental evidence is obtained on the automatic search task of TRECVID 2006 using a large lexicon of 311 learned semantic concept detectors. Copyright 2007 ACM.

关键词： Image retrieval

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Crowd2: Multi-agent Bandit-based Dispatch for Video Analytics upon Crowdsourcing 42

Crowd2: Multi-agent Bandit-based Dispatch for Video Analytic...

引用

42nd IEEE International Conference on computer Communications, INFOCOM 2023

作者： Chen, Yu Zhang, Sheng Yan, Yuting Jin, Yibo Chen, Ning Ji, Mingtao Xiao, Mingjun Nanjing University State Key Lab. for Novel Software Technology China University of Science and Technology of China School of Computer Science and Technology China

ISBN: (纸本)9798350334142

Many crowdsourcing platforms are emerging, leveraging the resources of recruited workers to execute various outsourcing tasks, mainly for those computing-intensive video analytics with high quality requirements. Although the profit of each platform is strongly related to the quality of analytics feedback, due to the uncertainty on diverse performance of workers and the conflicts of interest over platforms, it is non-trivial to determine the dispatch of tasks with maximum benefits. In this paper, we design a decentralized mechanism for a Crowd of Crowdsourcing platforms, denoted as Crowd2, optimizing the worker selection to maximize the social welfare of these platforms in a long-term scope, under the consideration of both proportional fairness and dynamic flexibility. Concretely, we propose a video analytics dispatch algorithm based on multi-agent bandit, for which the more accurate profit estimates are attained via the decoupling of multi-knapsack based mapping problem. Via rigorous proofs, a sub-linear regret bound for social welfare of crowdsourcing profits is achieved while both fairness and flexibility are ensured. Extensive trace-driven experiments demonstrate that Crowd2 improves the social welfare by 36.8%, compared with other alternatives. © 2023 IEEE.

关键词： Profitability

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Towards location-aware topology in both unstructured and structured P2P systems

Towards location-aware topology in both unstructured and str...

引用

36th International Conference on Parallel Processing in Xi'an, ICPP

作者： Qiu, Tongqing Chen, Guihai Ye, Mao Chan, Edward Zhao, Ben Y. State Key Lab. of Novel Software Nanjing University Department of Computer Science City University of Hong Kong Department of Computer Science UC Santa Barbara

ISBN: (纸本)076952933X

A self-organizing peer-to-peer system is built upon an application level overlay, whose topology is independent of underlying physical network. A well-routed message path in such systems may result in a long delay and excessive traffic due to the mismatch between logical and physical networks. In order to solve this problem, we present a family of Peer-exchange Routing Optimization Protocols (PROP) to reconstruct the overlay. It includes two policies: PROP-G for generic condition and PROP-O for optimized one. Both theoretical analysis and simulation experiments show that these two protocols greatly reduce the average latency of the overlay and achieve a location-aware topology with low overhead. Their overall performance can be further improved if combined with other recent approaches. Specifically, PROP-G can be easily applied to both structured and unstructured systems without the loss of their primary characteristics, such as efficient routing and anonymity. PROP-O, on the other hand, is more efficient, especially in a heterogeneous environment where nodes have different processing capabilities. © 2007 IEEE.

关键词： Peer to peer networks

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Recovery of material under complex illumination conditions

Recovery of material under complex illumination conditions

引用

Proceedings GRAPHITE 2004 - 2nd International Conference on computer Graphics and Interactive Techniques in Australasia and South East Asia

作者： Wu, Enhua Sun, Qimin Liu, Xuehui Key Lab. of Computer Science Institute of Software Chinese Academy of Sciences China Dept. of Computer Science University of Macau Macao China Dept. of Computer Science Qufu Normal University Shandong China Key Lab. of Computer Science Institute of Software Chinese Academy of Sciences Beijing China

ISBN: (纸本)1581138849

To calculate the inter-reflection between real objects and virtual ones in augmented reality, recovery of material for the real objects is necessary. In this paper, an approach is proposed to recover the material properties from a single high dynamic range image for a homogeneous object under complex illumination conditions. By the method, we first acquire a high dynamic range image for the object, and one or a few environment maps in high dynamic range as illumination of the object. Then a simulated annealing algorithm is employed to solve the inverse rendering problem. Finally, we obtain optimal parameter values for the reflection model in approximating the material of the object. In the course of optimization, image-based lighting and ray tracing techniques are used, and as a result the inter-reflection can be calculated in convenience. In addition, the transparent and translucent properties can be also recovered.

关键词： Lighting

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QCC: A novel cluster algorithm based on quasi-cluster centers 28

QCC: A novel cluster algorithm based on quasi-cluster center...

引用

28th International Conference on software Engineering and Knowledge Engineering, SEKE 2016

作者： Huang, Jinlong Zhu, Qingsheng Yang, Lijun Cheng, Dongdong Chongqing Key Lab. of Software Theory and Technology College of Computer Science Chongqing University Chongqing400044 China

ISBN: (纸本)189170639X

Cluster analysis is aimed at classifying elements into categories on the basis of their similarity. And cluster analysis has been widely used in many areas such as pattern recognition, and image processing. In this paper, we propose an approach based on the idea that the density of cluster centers are highest in its k nearest neighborhood or reverse k nearest neighborhood, and clusters is divided by sparse region. We firstly define the similarity between clusters. Based on this idea, no matter non-spherical data or complex manifold data, the proposed algorithm is applicable. And the proposed algorithm has a certain capacity on outliers detection. We demonstrate the power of the proposed algorithm on several test cases. Its clustering performance is better than DBSCAN, DP and K-AP clustering algorithms.

关键词： Cluster analysis

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Deforming surface simplification based on feature preservation

Deforming surface simplification based on feature preservati...

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6th International Conference of Entertainment Computing, ICEC 2007

作者： Shixue, Zhang Enhua, Wu Dept. of Computer and Information Science University of Macau Macao China State Key Lab. of Computer Science Institute of Software Chinese Academy of Sciences China

ISBN: (纸本)3540748725

In computer graphics, methods for mesh simplification are common. However, most of them focus on static meshes, only few works have been proposed for simplifying deforming surfaces. In this paper, we propose a new method for the multiresolution representation of time-varying meshes based on deformation area and feature preservation. Our method uses the famous QEM (quadric error metric) as our basic metric. The idea is to modify the edge collapse cost by adding the deformation and sharp feature weight to the aggregated quadrics errors when computing the unified edge contraction sequence, then adjust this sequence slightly for each frame to get a minimum geometry distortion. Our approach is fast, easy to implement, and as a result good quality dynamic approximations with well-preserved fine details can be generated at any given frame. © ERIP International Federation for Information Processing 2007.

关键词： computer graphics

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