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International Conference on Computer and Information Technology (CIT)

作者： Zilei Wang Hongsheng Xi Guo Wei Key Laboratory of Network Communication System and Control Chinese Academy of Sciences University of Science and Technology Hefei Anhui China Department of Electronic Engineering and Information Science USTC Hefei Anhui China

Constant rate transmission and transport (CRTT) is an effective bandwidth smoothing scheme resulting in one fixed rate during the whole duration of variable bit-rate video, which, however, needs a large client buffer size. The minimum buffer requirement (MBR) of CRTT, besides benefiting the design of some piecewise transmission scheme, can examine whether we can transmit the requested video with a constant rate for a given buffer size. In this paper, we formulate off-line bandwidth smoothing into a binary classification problem of the underflow and overflow points. Then we propose a novel algorithm based on support vector machine because of its equal margin, which,we have proven, is able to minimize the required buffer size of CRTT. Our algorithm, therefore, can exactly calculate MBR together with the CRTT transmission rate without exhaustively searching buffer sizes and startup delay. The simulation results using some real MPEG4 and H.264 video show the philosophy and effectiveness of our algorithm.

关键词： Support vector machines Smoothing methods Bandwidth Support vector machine classification Streaming media Video compression Computer networks Delay MPEG 4 Standard Buffer storage

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Adaptive synchronization of hyperchaotic Chen systems

Adaptive synchronization of hyperchaotic Chen systems

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IEEE International Conference on Computational Intelligence for Measurement systems and Applications (CIMSA)

作者： Lingling Tian Donghai Li School of Automation Science and Electrical Engineering Beihang University Beijing China State Key Laboratory of Power System Department of Thermal Engineering Tsinghua University Beijing China

This study addresses the synchronization of hyperchaotic Chen system. By using only one output, a novel controller with a high gain observer is designed to realize the globally asymptotical stability of the error dynamical system. According to the Lyapunov stability theorem, the asymptotic stability of the close loop system is studied. Numerical simulations and theoretical analysis show that the controller is effective and feasible.

关键词： Chaotic communication Control systems Asymptotic stability Telecommunication control Adaptive control Power system stability Numerical simulation Nonlinear control systems Computational intelligence Power measurement

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Thermal Stability of Reliable Polycrystalline Zirconium Oxide for Nonvolatile Memory Application

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Chinese Physics Letters 2008年第10期25卷 3742-3745页

作者：周鹏李晶陈良尧汤庭鳌林殷茵 School of Microelectronies and State Key Lab of ASIC and System Fudan University Shanghai 200433 Department of Optical Science and Engineering Fudan University Shanghai 200433

Thermal stability of resistive switching of stoichiometric zirconium oxide thin films is investigated for high yielding nonvolatile memory application. The A1/ZrO2/AI cell fabricated in the conventional device process shows highly reliable switching behaviour between two distinct stable resistance states. The retention capabilities are also tested under various conditions and temperatures. The excellent performance of Ai/ZrO2/AI ceil can be explained by assuming that anode/ZrO2 interface exists and by conducting filament forming/rupture mechanism. The device failure is illustrated in terms of permanent conducting filaments formation.

关键词： the power-law exponents precipitation durative abrupt precipitation change

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A Novel Deterministic Quantum communication Scheme Using Stabilizer Quantum Code

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communications in Theoretical Physics 2008年第1期49卷 93-99页

作者： GUO Ying CHEN Zhi-Gang HUANG Da-Zu ZENG Gui-Hua Department of Communication Engineering Central South University Changsha 410063 China State Key Laboratory on Fiber-Optic Local Area Communication Networks and Advanced Optical Communication System Department of Electronic Engineering Shanghai Jia~tong University Shanghai 200030 China Department of Information Management Hunan Finance and Economics College Changsha 410205 China

Exploiting the encoding process of the stabilizer quantum code [[n, k, d]], a deterministic quantum communication scheme, in which n - 1 photons are distributed forward and backward in two-way channel, is proposed to transmit the secret messages with unconditional security. The present scheme can be implemented to distribute the secret quantum （or classical） messages with great capacity in imperfect quantum channel since the utilized code encodes k-qubit messages for each scheme run.

关键词： quantum key distribution quantum error-correction code quantum information

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Chemical sensor based on microring resonators

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Guangdianzi Jiguang/Journal of Optoelectronics Laser 2009年第9期20卷 1133-1136页

作者： Chen, Yao Li, Zhen-Yu Zhou, Zhi-Ping Yu, Jun State Key Laboratory on Advanced Optical Communication Systems and Networks Peking University Beijing 100871 China College of Physics Science and Technology Guangxi University Nanning 530004 China Department of Electronic Science and Technology Huazhong University of Science and Technology Wuhan 430074 China School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332-0250 United States

The microring resonator was fabricated by using CMOS compatible processes with 1 μm wide waveguides and 400 μm in radius, which has a high Q factor up to 20, 000 and a Free spectrum range of 0.5 nm. A measurement scheme was proposed by using the resonator, a single-wavelength light source and an optical power meter, which has higher system sensitivity than the conventional measurement setup by detecting resonance wavelength shifts with an optical spectrometer. Finally, the resonator was applied to detect glucose concentrations with sensitivity as high as 10-4RIU, which proves its feasible application in liquid sensing areas.

关键词： Light sources

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Forgeability of Wang-Tang-Li's ID-Based Restrictive Partially Blind Signature Scheme

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Journal of Computer science & Technology 2008年第2期23卷 265-269页

作者：刘胜利陈晓峰张方国 Department of Computer Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Information SecurityInstitute of SoftwareChinese Academy of Sciences Beijing 100080China Department of Computer Science School of Information Science and TechnologySun Yat-Sen University Guangzhou 510275China Department of Electronics and Communication Engineering School of Information Science and Technology Sun Yat-Sen UniversityGuangzhou 510275China

Restrictive partially blind signature （RPBS） plays an important role in designing secure electronic cash system Very recently, Wang, Tang and Li proposed a neW ID-based restrictive partially blind signature （ID-RPBS） and gave the security proof. In this paper, we present a cryptanalysis of the scheme and show that the signature scheme does not satisfy the property of unforgeability as claimed. More precisely, a user can forge a valid message-signature pair （ID, msg, info＇, σ＇） instead of the original one （ID, msg, info, σ）, where info is the original common agreed information and info＇≠info. Therefore, it will be much dangerous if Wang-Tang-Li＇s ID-RPBS scheme is applied to the off-line electronic cash system. For example, a bank is supposed to issue an electronic coin （or bill） of $100 to a user, while the user can change the denomination of the coin （bill） to any value, say $100 000 000, at his will.

关键词： unforgeability restrictive partially blind signature ID-based cryptography electronic cash

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A heterogeneous reconfigurable baseband architecture for wireless LAN transceivers

A heterogeneous reconfigurable baseband architecture for wir...

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IEEE International Conference on Electro-Information Technology

作者： Wenqing Lu Shuang Zhao Chao Lu Xiaofang Zhou Gerald E. Sobelman State Key Laboratory of ASIC and System Fudan University Shanghai China Department of Electrical and Computer Engineering University of Minnesota Minneapolis MN USA

An efficient and configurable computational platform is indispensable in order to meet multiple wireless communications standards. We have developed a heterogeneous reconfigurable architecture to support the arithmetic, logic and signal processing functions which are required for transceivers used in standardized wireless local area networks. Each execution unit in this reconfigurable architecture focuses on a certain general operation, so that the combination of them can complete the various algorithms. We demonstrate the effectiveness of our approach through an implementation of the baseband of IEEE 802.11a/b/g standards and evaluate its performance.

关键词： Baseband Wireless LAN Transceivers Reconfigurable architectures Signal processing algorithms Computer architecture Wireless communication communication standards Arithmetic Reconfigurable logic

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Multi-robot cooperative pursuit based on combinatorial auction mechanism under dynamic environment

Multi-robot cooperative pursuit based on combinatorial aucti...

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2008 2nd International Symposium on systems and Control in Aerospace and Astronautics, ISSCAA 2008

作者： Su, Cai Ze Ning, Sun Li Bo, Gao Hai Cheng, Zhou Pu State Key Laboratory of Advanced Robot and System Harbin Institute of Technology Harbin 150001 Heilongjiang China School of Computer Science and Technology Harbin Institute of Technology Harbin 150001 Heilongjiang China Department of Information Engineering Artillery Academy of PLA Hefei 230031 AnHui Province China

This paper mainly discusses the pursuit-evasion games, in which a team of autonomous mobile robots act as pursuers to pursue multiple moving targets cooperatively. In order to reduce the communication load during the task negotiation process, the auction mechanism in Economics was introduced,and an improved task negotiation process based on Multi-Unit Combinatorial Auction was proposed. It allocated task dynamically through capability classification and independent competition. A kind of multi-robot cooperative pursuit algorithm that allows dynamic alliance is proposed. Simulation results show the feasibility and validity ofthe given algorithm.

关键词： Multipurpose robots

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Wideband wireless channel predictor relying on environment information

Wideband wireless channel predictor relying on environment i...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Yan Zhang Shanjian Liu Yanhua Rui Shidong Zhou Jing Wang State Key Laboratory on Microwave and Digital Communications Tsinghua National Laboratory for Information Science and Technology Department of Electronic Engineering Tsinghua University Beijing China Institute of Communication Engineering of PLAUST Nanjing China

With the development of wireless communication system, long-range precise channel prediction is considered to be more important. Traditional predictors require a lot of pilots and their performances degrade very fast after the correlation time, especially in high speed mobile environment. A new parametric channel predictor, CPREI, which is based on the auxiliary environment information, is presented in this paper. This new method can reduce the number of pilots and improve the prediction length. From the evaluation with real measured data, this predictor outperforms the former auto regression (AR) predictor.

关键词： Wideband Scattering Predictive models Frequency Laboratories Mobile communication Degradation Digital communication Information science Microwave technology

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Nitrogen and Silicon Co-Doping of Ge2Sb2Te5 Thin Films for Improving Phase Change Memory Performance

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Chinese Physics Letters 2007年第3期24卷 781-783页

作者：蔡燕飞周鹏林殷茵汤庭鳌陈良尧李晶乔保卫赖云峰冯洁蔡炳初陈邦民 Department of Microelectronics ASIC & System State Key Lab Fudan University Shanghai 200433 Department of Optical Science and Engineering Fudan University Shanghai 200433 Research Institute of Micro/Nanometer Technology Shanghai Jiao Tong University Shanghai 200030 Silicon Storage Technology Inc. 1171 Sonora Court Sunnyvale CA94086 U.S.A.

Electrical properties and phase structures of （Si＋N）-codoped Oe2Sb2Te5 （GST） for phase change memory are investigated to improve the memory performance. Compared to the films with N or Si dopants only in previous reports, the （Si＋N）-doped GST has a remarkable improvement of crystalline resistivity of about 104mΩcm. The Fourier-transform infrared spectroscopy spectrum reveals the Si-N bonds formation in the film. X-ray diffraction patterns show that the grain size is reduced due to the crystallization inhibition of the amorphous GST by SiNx, which results in higher crystalline resistivity. This is very useful to reduce writing current for phase change memory applications.

关键词： RANDOM-ACCESS MEMORY ELECTRICAL-PROPERTIES CRYSTALLIZATION IMPROVEMENT MODEL

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