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Research and design of a fiber-optic temperature sensing film probe

Zhongguo Jiguang/Chinese Journal of Lasers 2011年第SUPPL. 1期38卷 s107004-1-s107004-4页

作者： Hu, Jiahui Tao, Chunxian Zhang, Dawei Huang, Yuanshen Ni, Zhengji Shanghai Key Laboratory of Modern Optical System School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai 200093 China

In order to solve nonlinear and unstable problem in measurement, a fiber-optic temperature sensing film probe was designed. The material of the sensing film probe is germanium. The sensing probe is a double-layered film structure, in which the low refractive index material is silicon dioxide and the high refractive index material is germanium. The detection principle is based on the changes of refractive index of germanium because of the temperature change, resulting in changes in the reflectivity. Practically, we can get the temperature figures by measuring the reflected power. The line linearization of the sensor, which was obtained over a temperature measurement range of 30°C-130°C is 99.85%. The results show that the conclusion can meet the purpose of linearization of fiber temperature sensor.

关键词： Thin films

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Research on physical conflict model based power allocation and link scheduling in MRMC wireless networks

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Xitong Gongcheng Lilun yu Shijian/system Engineering Theory and Practice 2011年第SUPPL. 2期31卷 101-104页

作者： Guo, Ya-Hong Wang, Xian School of Information Science and Technology Heilongjiang University Harbin 150080 China School of Computer Science and Technology Heilongjiang University Harbin 150080 China Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin 150080 China

In order to improve the network spatial reuse and maximize the network throughput, this paper presents a physical conflict model based power allocation and link scheduling algorithm (PPLA). Firstly, PPLA picks available set of parallel links using hexagon coloring method. With physical conflict model, it further obtains the minimum power vector which corresponds to parallel links set. The experimental results indicate that the algorithm can increase network spatial reuse ratio and improve throughput significantly.

关键词： Throughput

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iDARE: Proactive data replication mechanism for P2P VoD system

iDARE: Proactive data replication mechanism for P2P VoD syst...

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10th IEEE International Conference on computer and Information technology, CIT-2010, 7th IEEE International Conference on Embedded Software and systems, ICESS-2010, 10th IEEE Int. Conf. Scalable computing and Communications, ScalCom-2010

作者： Liao, Xiaofei Zhang, Fan Jin, Hai Yu, Linchen Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China School of Computer China University of Geosciences Wuhan 430074 China

ISBN: (纸本)9780769541082

Peer-to-peer (P2P) on-demand streaming systems inevitably suffer from peers churn that is the inherent dynamic characteristic of overlay network. With frequent peer departure, a large amount of media data cached on peer disk turns offline and unavailable, which becomes the major reason of heavy server load. To address the above issue, a new proactive data replication mechanism is proposed and implemented in existing P2P on-demand system GirdCast. Based on the new mechanism, peer can proactively replicate data chunks to stable cache servers for future sharing, when it has high possibility to leave the overlay. Two key heuristic algorithms are designed for departure prediction and replicated chunks selection. system trace driven simulation shows that the mechanism greatly decreases bandwidth load of media source server and improves the availability of chunks highly demanded but poorly provisioned by overlay peers. © 2010 IEEE.

关键词： Heuristic algorithms

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Cross-layer design for multi-power multi-radio wireless sensor networks

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Xitong Gongcheng Lilun yu Shijian/system Engineering Theory and Practice 2011年第SUPPL. 2期31卷 114-118页

作者： Guo, Xiao-Hang Li, Jin-Bao School of Computer Science and Technology Heilongjiang University Harbin 150080 China Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin 150080 China

In this paper, we investigate on the optimal routing jointly scheduling, channel and power assignment in multi-power multi-radio WSNs. We first formulate the optimal routing as a linear programming problem, and then design a polynomial time heuristic algorithm. Experiments show that the proposed cross-layer routing significantly reduce the energy consumption and the end-to-end transmission delay.

关键词： Wireless sensor networks

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Simulation scenario design method and its application based on conceptual models of mission space

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Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (science and technology) 2011年第SUPPL. 1期42卷 1096-1100页

作者： Gao, Bing-Zhi Wu, Di Ge, Xiong Ban, Xiao-Juan School of Computer Science and Electronics University of Science and Technology Beijing Beijing 100083 China Key Laboratory of Complex System Intelligent Control and Decision of Education Ministry Beijing Institute of Technology Beijing 100081 China

A simulation system scenario design method was proposed for the space-based information simulation system supporting anti-earthquake rescue. This method is based on the conceptual models of the mission space method including the formal description of simulation aim, scale, static data, dynamic data set and simulation play. A simulation scenario creator was developed to realize these functions and prove the usability of these models.

关键词： Earthquakes

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A General Sharing Model Based on Proxy Re-encryption

A General Sharing Model Based on Proxy Re-encryption

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International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIHMSP)

作者： Guojun Ma Qingqi Pei Yuchen Wang Xiaohong Jiang The State Key Laboratory of Integrated Services Networks Xidian University Xi'an China School of Electronic Engineering University of Electronic Science and Technology of China Chengdu China Key Lab of Computer Networks and Information Security of Ministry of Education Xidian University Xi'an China

Content sharing is one of the most significant issues of Digital Rights Management (abbr. DRM). Various schemes for content sharing have been presented in the past years. However, the main goals of these schemes are to solve portability problems instead of rational sharing between different users who are not family members. In this work, we propose an initial step toward this rational sharing and present a general sharing model based on proxy re-encryption. Our model can support the flexible sharing mechanism, with which the user can choose any of the purchased content to share with any legal device, and the content provider can know and limit the number of sharing devices to achieve some novel DRM policies such as pay-per-sharing. To our best knowledge, our sharing model is the first model for content sharing between different users' devices who are not family members using proxy re-encryption. With rational applications, our model can benefit for both the user and content provider to achieve win-win development.

关键词： Licenses Public key Computational modeling Encryption Educational institutions Law

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Efficient Distributed Skyline Queries for Mobile Applications

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计算机科学技术学报（英文版） 2010年第3期25卷 523-536页

作者： Ying-Yuan Xiao Yue-Guo Chen Tianjin Key Laboratory of Intelligence Computing and Novel Software Technology Tianjin University of Technology Tianjin 300191China Key Laboratory of Computer Vision and System Tianjin University of TechnologyTianjin 300191China School of Computing National University of Singapore117417Singapore Key Laboratory of Data Engineering and Knowledge Engineering Renmin University of ChinaBeijing 100872China

In this paper,we consider skyline queries in a mobile and distributed environment,where data objects are distributed in some sites(database servers)which are interconnected through a high-speed wired network,and queries are issued by mobile units(laptop,cell phone,etc.)which access the data objects of database servers by wireless *** inherent properties of mobile computing environment such as mobility,limited wireless bandwidth,frequent disconnection,make skyline queries more *** show how to efficiently perform distributed skyline queries in a mobile environment and propose a skyline query processing approach,called efficient distributed skyline based on mobile computing(EDS-MC).In EDS-MC,a distributed skyline query is decomposed into five processing phases and each phase is elaborately designed in order to reduce the network communication,network delay and query response *** conduct extensive experiments in a simulated mobile database system,and the experimental results demonstrate the superiority of EDS-MC over other skyline query processing techniques on mobile computing.

关键词： skyline distributed query processing mobile database system

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Optimizations and Deoptimizations for Escape Analysis in Open World

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电子学报(英文版) 2010年第2期19卷 211-216页

作者： SHI Xiaohua WU Gansha JIN Maozhong LUEH Guei-Yuan School of Computer Science Beihang University Beijing China Programming System Laboratory Microprocessor Technology Labs Intel Corporation Beijing China

This paper introduced the optimization and deoptimization technologies for Escape analysis in open world. These technologies are used in a novel Escape analysis framework that has been implemented in Open runtime platform, Intel's opensource Java virtual machine. We introduced the optimization technologies for synchronization removal and object stack allocation, as well as the runtime deoptimization and compensation work. The deoptimization and compensation technologies are crucial for a practical Escape analysis in open world. We evaluated the runtime efficiency of the deoptimization and compensation work on benchmarks like SPECjbb2000 and SPECjvm98.

关键词：优化技术世界逃生 Java虚拟机运行平台补偿工作开放源码补偿技术

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SID: Ship Intrusion Detection with Wireless Sensor Networks

SID: Ship Intrusion Detection with Wireless Sensor Networks

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International Conference on Distributed computing systems

作者： Hanjiang Luo Kaishun Wu Zhongwen Guo Lin Gu Zhong Yang Lionel M. Ni Department of Computer Science Ocean University of China China Department of Computer Science & Engineering Hong Kong University of Science and Technology Hong Kong China School of Physics and Engineering Sun Yat-sen University Guangzhou China Department of Information Engineering Zibo Vocational Institute Zibo China Shanghai Key Laboratory of Scalable Computing and Systems Shanghai Jiaotong University Shanghai China

Surveillance is a vital problem for harbor protection, border control or the security of other commercial facilities. It is particularly challenging to protect the vast near-coast sea surface and busy harbor areas from intrusions of unauthorized marine vessels, such as trespassing boats and ships. In this paper, we present an innovative solution for ship intrusion detection. Equipped with three-axis accelerometer sensors, we deploy an experimental wireless sensor network on the sea surface to detect ships. Using signal processing techniques and cooperative signal processing, we can detect the passing ships by distinguishing the ship-generated waves and the ocean waves. We design an intrusion detection system in which we propose to exploit spatial and temporal correlations of the intrusion to increase detection reliability. We conduct evaluations with real data collected by our initial experiments, and provide quantitative analysis on the detection system, such as the successful detection ratio and the estimation of the intruding ship velocity.

关键词： Marine vehicles Sensors Accelerometers Ocean waves Intrusion detection Sea measurements Wavelet transforms

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Data Mining in Earth system science (DMESS 2011)

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Procedia computer science 2011年 4卷 1450-1455页

作者： Forrest M. Hoffman J. Walter Larson Richard Tran Mills Bjørn-Gustaf J. Brooks Auroop R. Ganguly William W. Hargrove Jian Huang Jitendra Kumar Ranga R. Vatsavai Computational Earth Sciences Group Oak Ridge National Laboratory Oak Ridge TN USA Department of Earth System Science University of California Irvine CA USA Mathematics and Computer Science Division Argonne National Laboratory Argonne IL USA Computation Institute University of Chicago/Argonne National Laboratory Chicago IL USA School of Computer Science The Australian National University Canberra ACT AUSTRALIA Department of Electrical Engineering & Computer Science University of Tennessee Knoxville TN USA Center for Climatic Research University of Wisconsin Madison WI USA Geographic Information Science and Technology Group Oak Ridge National Laboratory Oak Ridge TN USA Eastern Forest Environmental Threat Assessment Center (EFETAC) USDA Forest Service Asheville NC USA

From field-scale measurements to global climate simulations and remote sensing, the growing body of very large and long time series Earth science data are increasingly difficult to analyze, visualize, and interpret. Data mining, information theoretic, and machine learning techniques—such as cluster analysis, singular value decomposition, block entropy, Fourier and wavelet analysis, phase-space reconstruction, and artificial neural networks—are being applied to problems of segmentation, feature extraction, change detection, model-data comparison, and model validation. The size and complexity of Earth science data exceed the limits of most analysis tools and the capacities of desktop computers. New scalable analysis and visualization tools, running on parallel cluster computers and supercomputers, are required to analyze data of this magnitude. This workshop will demonstrate how data mining techniques are applied in the Earth sciences and describe innovative computer science methods that support analysis and discovery in the Earth sciences.

关键词： Data mining Remote sensing High performance computing Segmentation Change detection Synthesis visualization

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