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28th International Conference on software Engineering 2006, ICSE '06

作者： Mingshu, Li Meng, Huang Fengdi, Shu Juan, Li Lab. for Internet Software Technologies Institute of Software Chinese Academy of Sciences Beijing 100080 China State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences Beijing 100080 China Graduate University Chinese Academy of Sciences Beijing 100080 China

ISBN: (纸本)1595933751

XP (eXtreme Programming) has become popular for IID (Iteration and Increment Development). It is suitable for small teams, lightweight projects and vague/volatile requirements. However, some challenges are left to developers when they desire to practise XP. A critical one of them is constructing the release plan and negotiating it with customers. In this paper, we propose a risk-driven method for XP release planning. It has been applied in a case study and the results show the method is feasible and effective. XP practicers can follow it to decide a suitable release plan and control the development process. Copyright 2006 ACM.

关键词： computer programming

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Color changing and fading simulation for frescoes based on empirical knowledge from artists

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PCM 2006: 7th Pacific Rim Conference on Multimedia

作者： Xifan, Shi Dongming, Lu Jianming, Liu College of Computer Science and Technology Zhejiang University 310027 Hangzhou Zhejiang China State Key Lab. of CAD and CG Zhejiang University 310027 Hangzhou Zhejiang China

ISBN: (纸本)3540487662

Visualizing the color changing and fading process of ancient Chinese wall paintings to tourists and researchers is of great value in both education and preservation. But previously, because empirical knowledge from artists was not introduced, it is infeasible to simulate the color changing and fading in the absence of physical and chemical knowledge of color changing and fading of frescoes. In this paper, however, empirical knowledge from artists is formalized. Since the improved system can reflect knowledge from artists in addition to the previous physical and chemical modeling, the simulation results are faithful to the color aging process of frescoes. In this article, first, the former related works is reviewed. Then, the formalization of empirical knowledge from artists is narrated. After that, the simulation results are shown and discussed. And finally, future research is suggested. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Image quality

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Two important action scenes detection based on probability neural networks

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3rd International Symposium on Neural Networks, ISNN 2006 - Advances in Neural Networks

作者： Geng, Yu-Liang Xu, De Yuan, Jia-Zheng Feng, Song-He Institute of Computer Science and Technology Beijing Jiaotong University Beijing 100044 China Beijing Key Lab. of Intelligent Telecommunications Software Multimedia Beijing University of Posts and Communications Beijing 100876 China

ISBN: (纸本)3540344373

In this paper, an effective classification approach for action scenes is proposed, which exploits the film grammar used by filmmakers as guideline to extract features, detect and classify action scenes. First, action scenes are detected by analyzing film rhythm of video sequence. Then four important features are extracted to characterize chase and fight scenes. After then the Probability Neural Networks is employed to classify the detected action scenes into fight, chase and uncertain scenes. Experimental results show that the proposed method works well over the real movie videos. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Neural networks

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Applying the value/petri process to ERP software development in China 06

Applying the value/petri process to ERP software development...

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28th International Conference on software Engineering 2006, ICSE '06

作者： Huang, LiGuo Boehm, Barry Hu, Hao Ge, Jidong Lü, Jian Qian, Cheng Computer Science Department University of Southern California Los Angeles CA 90089-0781 United States State Key Lab. of Novel Software Tech. Institute of Computer Software Nanjing University 210093 China Neusoft Co. Ltd. Neusoft Park Shenyang 110179 China

ISBN: (纸本)1595933751

Commercial organizations increasingly need software processes sensitive to business value, quick to apply, and capable of early analysis for subprocess consistency and compatibility. This paper presents experience in applying a lightweight synthesis of a Value-Based software Quality Achievement (VBSQA) process and an Object-Petri-Net-based process model (called VBSQAOPN) to achieve a manager-satisfactory process for software quality achievement in an on-going ERP software project in China. The results confirmed that 1) the application of value-based approaches was inherently better than value-neutral approaches adopted by most ERP software projects;2) the VBSQA-OPN model provided project managers with a synchronization and stabilization framework for process activities, success-critical stakeholders and their value propositions;3) process visualization and simulation tools significantly increased management visibility and controllab.lity for the success of software project. Copyright 2006 ACM.

关键词： software engineering

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An evolutionary computational method for N-connection subgraph discovery

An evolutionary computational method for N-connection subgra...

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18th IEEE International Conference on Tools with Artificial Intelligence, ICTAI 2006

作者： Chen, Enhong Chen, Xujia Sheu, Phillip C.-Y. Qian, Tieyun Department of CS University of Science and Technology of China Hefei Anhui China State Key Lab. of Software Engineering Wuhan University China Department of EECS University of California Irvine CA 92697 Department of Computer Science Huazhong University of Science and Technology Wuhan Hubei China

ISBN: (纸本)0769527280

The Problem of n-connection subgraph discovery (n- CSDP for short) is to find a small sized subgraph that can well capture the relationship among the n given nodes in a large graph. However there have been very few researches directly addressing the CSDP problem. Furthermore the currently availab.e methods, for example, the electricity analogues based algorithm can only be suitable for tackling the 2-keynodes CSDP and does not work anymore when n is greater than two. To deal with this problem, we propose an effective approach to discover the subgraph in two stages. In the first stage we propose a neighbor-growth based method to extract a relatively bigger candidate subgraph compared with that of result subgraph. In the second stage an evolutionary algorithm for optimizing the result subgraph is proposed. For this purpose, UTM code, a transformed representation of the adjacent matrix of graphs is designed to encode the topology of subgraph as individuals. Then corresponding evolutionary operators able to be directly performed on UTM code are given. Thus the efficiency of the algorithm is largely improved. The experimental results obtained on two real large scale graphs with different topology characteristics demonstrate that our method solves n-connection subgraph discovery problems effectively. © 2006 IEEE.

关键词： Graph theory

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Traversal fields for ray tracing dynamic scenes

Traversal fields for ray tracing dynamic scenes

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13th ACM Symposium Virtual Reality software and Technology, VRST'06

作者： Huang, Peijie Wang, Wencheng Yang, Gang Wu, Enhua State Key Lab. of Computer Science Institute of Software Chinese Academy of Sciences Post Box: 8718 Beijing 100080 China Graduate University Chinese Academy of Sciences Beijing China Beijing Forestry University Beijing China Department of Computer and Information Science University of Macau Macau China

ISBN: (纸本)1595933212

This paper presents a novel scheme for accelerating ray traversal computation in ray tracing. By the scheme, a pre-computed stage is applied to constructing what is called a traversal field for each rigid object that records the destinations for all possible incoming rays. The field data, which could be efficiently compressed offline, is stored in a small number of big rectangles called ray-relays that enclose each approximate convex segment of an object. In the ray-tracing stage, the records on relays are retrieved in a constant time, so that a ray traversal is implemented as a simple texture lookup on GPU. Thus, the performance of our approach is only related to the number of relays rather than scene size, while the number of relays is quite small. In addition, because the traversal fields only depend on the internal construction of each convex segment, they can be used to ray trace objects undergoing rigid motions at a negligible extra cost. Experimental results show that interactive rates could be achieved for dynamic scenes with the effects of specular reflections and refractions on an ordinary desk PC with GPU. Copyright 2006 ACM.

关键词： Ray tracing

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Sketch understanding for electric-circuit diagramming in e-learning

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Journal of Computational Information systems 2006年第1期2卷 145-153页

作者： Feng, Guihuan Sun, Zhengxing Xie, Qiang Zheng, Wentao State Key Lab. for Novel Software Technology Nanjing University Nanjing 210093 China Department of Computer Science and Technology Nanjing University Nanjing 210093 China

Owing to the fluent and lightweight nature, sketch-based user interface is becoming increasingly significant in graphical computing. This paper presents a strategy of sketch understanding for electric circuit diagramming in e-learning. It can be characterized in three aspects. Firstly, the LR grammar modeling technique is adopted to represent drawing contexts and shapes. So that stroke parsing and sketch recognition can be combined. Secondly, error correction based on fuzzy logic reasoning is introduced to deal with errors caused by the ambiguity of recognition. Further provided a guide for stroke parsing based on the context. Significantly, it recognizes drawings recursively without user's explicit mediations. Experiments proved the proposed method is both effective and efficient.

关键词： Learning systems

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Hierarchical multicast tree algorithms of data grid

Hierarchical multicast tree algorithms of data grid

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2nd International Conference on Semantics, Knowledge, and Grid, SKG 2006

作者： Jia, Weijia Fan, Qingfeng Wu, Qingli He, Yanxiang Department of Computer Science City University of Hong Kong Hong Kong School of Computer Wuhan University Wuhan Hubei 430079 China School of Electronic Information Engineering Wuhan University Wuhan Hubei 430079 China State Key Lab. of Software Engineering Wuhan University Wuhan Hubei 430079 China State Multimedia and Software Engineering Engineering and Technology Research Centre Wuhan Hubei 430079 China

ISBN: (纸本)076952673X

Data Grid is one of the important research subjects in the field of Grid Computing. To get a high efficiency of the system, this paper proposes a set of novel multi-cast algorithms for Data grid, which can achieve shorter multicast delay and less resource consump-tions. In contrast to previous approaches, the algo-rithms in this paper partition the group members into clusters in the lower layer, seeking the most plenty of date amount node as an optimal core (root) and build-ing a shared tree within each cluster according to the algebra addition of the date amount of node and expo-nential to minimize the number of links used. In the upper layer, a shared tree is then constructed using our algorithms to implement the inter-cluster routing. The extended simulation results indicate that our algo-rithms are more suitable for Date Grid as compared with other well-known existing multicast solutions. © 2006 IEEE.

关键词： Grid computing

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Design and analysis of a self-tuning proportional and integral controller for active queue management routers to support TCP flows

Design and analysis of a self-tuning proportional and integr...

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INFOCOM 2006: 25th IEEE International Conference on computer Communications

作者： Xiong, Naixue Défago, Xavier Jia, Xiaohua Yan, G. He, Yanxiang School of Information Science Japan Advanced Institute of Science and Technology State Key Lab. of Software Engineering Computer School Wuhan University School of Information Science Japan Advanced Institute of Science and Technology 1-1 Asahidai Nomi Ishikawa 923-1292 Japan Kowloon Hong Kong IEEE IEEE Communication Society Department of Computer Science Wuhan University City University of Hong Kong Kowloon Hong Kong School of Computer Science and Technology Wuhan University of Science and Technology China SMIEEE

ISBN: (纸本)1424402212

Active Queue Management (AQM) is an effective method used in Internet routers for congestion control, and to achieve a tradeoff between link utilization and delay. The de facto standard, the Random Early Detection (RED) AQM scheme, and most of its variants use average queue length as a congestion indicator to trigger packet dropping. This paper proposes a novel AQM algorithm, called Self-tuning Proportional and Integral RED (SPI-RED), as an extension of RED. SPI-RED is based on a Self-tuning Proportional and Integral controller, which not only considers the average queue length at the current time point, but also takes into consideration the past average queue lengths during a round-trip time. Furthermore, we give theoretical analysis of the system stability and give guidelines for the selection of feedback gains for the TCP/RED system to stabilize the average queue length at a desirable level. Extensive simulations have been conducted with ns2. The simulation results have demonstrated that the proposed SPI-RED algorithm outperforms the existing AQM schemes in terms of drop probability and stability.

关键词： Queueing networks

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New approach to complexity reduction of intra prediction in advanced multimedia compression

New approach to complexity reduction of intra prediction in ...

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ICCSA 2006: International Conference on Computational science and Its Applications

作者： Yu, Mei Jiang, Gangyi Li, Shiping Li, Fucui Choi, Tae-Young Faculty of Information Science and Engineering Ningbo University Ningbo 315211 China State Key Lab. for Novel Software Technology Nanjing University Nanjing 210093 China Institute of Computer Technology Graduate School Chinese Academy of Sciences Beijing 100871 China Division of Electronics Engineering Ajou University Suwon 442-749 Korea Republic of

ISBN: (纸本)354034070X

H.264 is the new multimedia compression standard developed by VCEG and MPEG. In order to maximize the compression performance, H.264 adopts RDO mode decision techniques at the cost of very remarkable computational complexity. To reduce encoder complexity associated with the intra-prediction mode selection, in this paper, a fast intra prediction mode selection scheme is proposed. It is based on three improvement parts, including improvement of the intra prediction algorithm structure, fast selection between intra 4×4 block mode and intra 16×16 block mode, and the fast 4×4 luma block mode selection based on the luma similarity between reference pixels. Experimental results show that the proposed scheme outperforms Pan's method, and compared with the test model JM8.6 provided by JVT, the proposed scheme reduces 83.10% coding time for intra frames and 50.94% coding time for all the frames while maintaining the PSNR and bit rate. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Large scale systems

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