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International Conference on Pattern Recognition

作者： Yiming Wang Tong Lu Rongjun Gao Wenyin Liu JiangYin High Technology and Information Institute Nanjing University Nanjing China Nanjing University Nanjing Jiangsu CN Department of Computer Science City University of Hong Kong Hong Kong China State Key Laboratory of Novel Software Technology Nanjing University Nanjing China

ISBN: (纸本)9781424475421

A novel 3D shape matching method is proposed in this paper. We first extract angular and distance feature pairs from pre-processed 3D models, then estimate their kernel densities after quantifying the feature pairs into a fixed number of bins. During 3D matching, we adopt the KL-divergence as a distance of 3D comparison. Experimental results show that our method is effective to match similar 3D shapes, and robust to model deformations or rotation transformations.

关键词： Three dimensional displays Solid modeling Shape Feature extraction Kernel Computational modeling Estimation

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International Conference on Image Analysis and Signal Processing, IASP

作者： Yanmin Luo Minghong Liao Zhipeng Zhan College of Computer Science & Technology Huaqiao University Quanzhou China Congnitive Science Department Fujian Key Laboratory of the Brain-Like Intelligent Systems Xiamen University Xiamen China Software School of Xiamen University Xiamen China

Time-series data mining is a very important element of data mining. As a typical time-series data, video data has been widely used for many applications such as film, medical, sports and traffic areas. In this paper we integrates several technologies into the video moving object time-series data mining. We propose a similarity analysis and clustering algorithm for videos based on the moving trajectory time series data wavelet transform of the moving object in the videos. Utilizing the image difference technique, our algorithm detects the moving objects from the scene surveillance video, calculates the centroid of the moving object, and uses the centroid series to character the moving trajectory of the object. Then we use wavelet analysis method to achieve dimensionality reduction and get the first k wavelet coefficient to substitute the original motion time-serial data. Based on the Euclidean distance, we utilize two judgement rules to determine the similarity of time-serial data and cluster them, use the rules to perform the similarity search and clustering of video. We apply the algorithm to athletic sports videos analysis.

关键词： Time series analysis Algorithm design and analysis Clustering algorithms Wavelet analysis Wavelet transforms Data mining Biomedical imaging Object detection Layout Surveillance

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Availability based trust model of clusters for MANET

Availability based trust model of clusters for MANET

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International Conference on Services Systems and Services Management, ICSSSM

作者： Xibin Zhao Zhiyang You Zhifeng Zhao Danning Chen Feng Peng Key Laboratory of Information System Security of Ministry of Education School of Software Tsinghua University China Department of Computer Science and Technology Tsinghua University China Zhenjiang Watercraft College Department of Computer Science Zhenjiang Watercraft College China School of Software Tsinghua University China China Minzu Securities Company Limited China

MANET (Mobile ad hoc network) is vulnerable to security attack due to its characteristics such as open network environment, lack of centralized control, dynamic topology, and so on, while traditional security mechanisms cannot meet the security requirements of MANET due to the limited communication bandwidth, computation power, memory and battery capacity, and dynamic deployment environment. Many approaches have been suggested to trade-off between the security strength and efficiency, and most of them focus on the confidentiality and integrity of MANET while pay less attention to the availability issue. Based on the analysis of availability related factors in MANET, we present an availability based trust model in this paper. Furthermore, a cluster based trust model (ABTMC, Availability Based Trust Model of Clusters) is presented with the consideration with the resource constrain of node, dynamic topology, and the unbalance of computing capability and resource capability among MANET nodes. Many availability oriented security service can be obtained based on this model.

关键词： Mobile ad hoc networks Availability computer security Communication system security Information security Communication system software computer science Network topology Environmental management Proposals

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The Transition Between Sharp and Rounded Features and the Manipulation of Incompatible Boundary in Filling n-sided Holes

The Transition Between Sharp and Rounded Features and the Ma...

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International Conference on Shape Modeling and Applications

作者： Kan-Le Shi Jun-Hai Yong Peng Liu Jia-Guang Sun Jean-Claude Paul Key Laboratory of Information System Security Ministry of Education of China Beijing China Department of Computer Science and Technology Tsinghua University Beijing China Tsinghua National Laboratory for Information Science and Technology Beijing China School of Software Tsinghua University Beijing China Tsinghua University Beijing Beijing CN INRIA France

ISBN: (纸本)9781424472598;9780769540726

N-sided hole filling plays an important role in vertex blending. Piegl and Tiller presented an algorithm to interpolate the given boundary and cross-boundary derivatives in B-spline form. To deal with the incompatible cases that their algorithm cannot handle, we propose an extension method to manipulate the transition between sharp and rounded features. The algorithm first patches n crescent-shaped extended surfaces to the boundary with G 2 continuity to handle incompatibility problem in the corners. Then, we compute the inner curves and the corresponding cross-boundary derivatives fulfilling tangent and twist compatibilities. The generated B-spline Coons patches are G 1 -continuously connected exactly, and have ε-G 1 continuity with the extended surfaces. Our method improves the continuity-quality of the shape and reduces the count of the inserted knots. It can be applied to all G 0 -continuous boundary conditions without any restrictions imposed on the boundary or cross-boundary derivatives. It generates better shapes than some popular industrial modeling systems on these incompatible occasions. Some examples underline its feasibility.

关键词： Filling Spline Shape Educational technology Laboratories computer science Information science Information systems computer security Information security

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Robustify a job-shop schedule according to the payload of the machine

Robustify a job-shop schedule according to the payload of th...

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International Conference on Services Systems and Services Management, ICSSSM

作者： Zhiyang You Zhigang Sun Xibin Zhao Daxin Zang Department of Computer Science and Technology Tsinghua University Beijing China School of Software Tsinghua University Beijing China Key Laboratory of Information System Security Ministry of Education School of Software Tsinghua University Beijing China Software Engineering Institute Beijing Aeronautics and Astronautics University Beijing China

Robust scheduling is an effective way to solve job-shop scheduling problem (JSP) under a dynamic and stochastic environment with uncertainties, which may lead to numerous schedule disruptions. Maintaining the optimization obtained, the robust schedule is more stable in execution. The vast majority of the researches on robust scheduling concentrate on the development of the robustness and stabilization with an optimization target that minimizes makespan. However, other optimization targets are needed in reality, and in this paper, we introduce another optimization target that maximizes the payload of the machine, which can reflect the capacity of machine. This work applies a two-step way to achieve a robust schedule. A baseline schedule in the deterministic environment is generated first, which pursues standard optimization criterions, and then the temporal buffers are inserted into the baseline schedule which make the schedule absorb some level of unexpected disruption without rescheduling. According to the payload of each machine which should be close to the maximum at any time in execution, we can get each size of the temporal buffers inserted into the different operations. An extensive experiment is used to show the relative performance of the proposed robust schedule. It is shown that the schedule is robust and stable under the stochastic disturbance coupling with minimal makespan tardiness and symmetry payload.

关键词： Robustness Payloads Job shop scheduling Uncertainty Processor scheduling Dynamic scheduling Stochastic processes Switches computer science Space technology

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SMART: A Strengthened Model of Access Router Tree for Multihoming in Nested Mobile Network

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电子学报(英文版) 2009年第1期18卷 125-131页

作者： HUANG Songhua WU Xiaobing LU Yin HUANG Hao CHEN Guihai State Key Laboratory for Novel Software Technology Department of Computer Science Nanjing University Nanjing 210093 China

Load balance and failure tolerance are the crucial issues for multihomed mobile network. However, existing solutions are still far away from our expectation. In this paper, we first analyze the problems of multihoming in a nested mobile network and review their existing schemes in the eye of load balance and failure tolerance. Then we give a strengthened model of access router tree, where a novel and comprehensive metric for best path recognition is proposed to realize the load balance. In order to enhance the failure tolerance of the system, we further propose fast handover algorithms which can be used when burst access failure appears. We perform extensive simulations to evaluate the proposed scheme. Results indicate that comprehensive load balance and failure tolerance can be achieved. Moreover, our proposed handover algorithm achieves least latency of package transmission compared with its existing counterparts.

关键词：移动网络树模型路由器宿主嵌套负载平衡智能系统故障

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GaN high electron mobility transistors with localized Mg doping and drain metal extension

GaN high electron mobility transistors with localized Mg dop...

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2010 10th IEEE International Conference on Solid-state and Integrated Circuit technology

作者： Xie, Gang Zhang, Bo Fu, Fred Y. Ng, W.T. Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto Toronto ON M5S 3G4 Canada State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu Sichuan China Microelectronics TCAD Crosslight Software Inc. 121-3989 Henning Dr. Burnaby BC V5C 6P8 Canada

ISBN: (纸本)9781424457984

A Magnesium Doped Layer (MDL) under the 2-DEG channel and a Drain Metal Extension (DME) are proposed to provide a new degree of freedom in the optimization between breakdown voltage (BV) and specific on-resistance (R on-sp) in AlGaN/GaN HEMTs. The surface electric field of the proposed structure is distributed more evenly when compare to the MDL-only structure with the same dimensions. A breakdown voltage of 1390V with specific-on- resistance of 4mΩ·cm2 was obtained with LM = 1μm, a peak concentration of 8×1017 cm-3, L pd = 3μm and a drift region length of 10μm. Comparing with the conventional MDL-only HEMT structure, the MDL-DME is shown to deliver comparable specific-on-resistance while featuring a 54% BV improvement without any area overhead penalty. ©2010 IEEE.

关键词： High electron mobility transistors

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Fast and Accurate WSN Positioning in Emergency Logistics

Fast and Accurate WSN Positioning in Emergency Logistics

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International Conference on Networks Security, Wireless Communications and Trusted Computing, NSWCTC

作者： Lai Xin Li Jun Zhong Wei Cao Yuan Software College Tsinghua University Beijing China General Logistics Department PLA Science and Research Institute Beijing China State Key Laboratory for Novel Software Technology Nanjing University Nanjing China Software Center High-Tech Research Institute (CZ) Nanjing University Changzhou China

ISBN: (纸本)9781424465972;9780769540115

Accurate and fast nodes locating is required in large-scale emergency logistics with WSN (wireless sensor network) deployed. Under this background, the sensor nodes often move rapidly and frequently, and the mobility of nodes leads to poor reachability to the reference nodes. In this paper, we propose a fast and accurate positioning scheme based on WSN in emergency logistics. Two different wireless sensor networks with 20%+ nodes moving are deployed. Preliminary experiments demonstrate that the efficiency of the proposed system over performed other schemes.

关键词： Wireless sensor networks Logistics Large-scale systems Kinematics Wireless communication computer networks Educational institutions Laboratories Programmable logic arrays Tracking

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Breakdown voltage enhancement for GaN high electron mobility transistors

Breakdown voltage enhancement for GaN high electron mobility...

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International Symposium on Power Semiconductor Devices and Ics (ISPSD)

作者： Gang Xie Bo Zhang Fred Y. Fu W. T. Ng State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology Chengdu Sichuan China Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto Toronto ONT Canada Microelectronics TCAD Crosslight software Inc. Burnaby BC Canada

ISBN: (纸本)9781424477180

This paper presents a high voltage AlGaN/GaN HEMTs with remarkable breakdown voltage enhancement by introducing a magnesium doping layer under the 2-DEG channel. The surface electric field is distributed more evenly when compare to a conventional device structure with the same dimensions. This is primarily due to the presence of a charge balanced magnesium doping layer acting as a floating field plate. By optimizing the layer's length, L and the doping concentration, a breakdown voltage of 900V with specific on resistance of 4mΩ·cm 2 was obtained with L = 1.5μm, a peak concentration of 8×10 17 cm -3 and a drift region length of 10μm. Comparing with previously published breakdown optimization techniques, this work achieved a 100% improvement in specific on-resistance without any area overhead penalty.

关键词： Gallium nitride HEMTs MODFETs Aluminum gallium nitride Doping Magnesium Electron mobility Power semiconductor devices Strontium Electronic mail

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QoS Requirement Generation and Algorithm Selection for Composite Service Based on Reference Vector

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Journal of computer science & technology 2009年第2期24卷 357-372页

作者：吴邦欲支志雄徐世杰顾明孙家广 School of Software Tsinghua University Key Laboratory for Information System Security Ministry of Education of China Department of Computer Science and Technology Tsinghua University

Under SOA （Service-Oriented Architecture）, composite service is formed by aggregating multiple component services together in a given workflow. One key criterion of this research topic is QoS composition. Most work on service composition mainly focuses on the algorithms about how to compose services according to assumed QoS, without considering where the required QoS comes from and the selection of user preferred composition algorithm among those with different computational cost and different selection results. In this paper, we propose to strengthen current service composition mechanism by generation of QoS requirement and its algorithm selection based on the QoS reference vectors which are calculated optimally from the existing individual services＇ QoS by registry to represent QoS overview about the best QoS, the worst （or most economical） QoS, or the average QoS of all composite services. To implement QoS requirement, which is determined according to QoS overview, this paper introduces two selection algorithms as two kinds of experiment examples, one aiming at the most accurate service selection and the other chasing for trade-off between selection cost and result. Experimental results show our mechanism can help the requester achieve his expected composite service with appropriate QoS requirement and customized selection algorithm.

关键词： service-oriented architecture service composition quality of services service selection

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