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ON CONTROLLABILITY FOR STOCHASTIC CONTROL SYSTEMS WHEN THE COEFFICIENT IS TIME-VARIANT

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Journal of Systems Science & Complexity 2010年第2期23卷 270-278页

作者： Feng LIU Shige PENG school of ElecLronics and information Engineering Beijing Jiaotong University Beijing 100044 China. school of Mathematics and System Sciences Shandong University Ji'nan 250100 China

This paper investigates the controllability problem of time-variant linear stochastic controlsystems.A sufficient and necessary condition is established for stochastic exact controllability,whichprovides a useful algebraic criterion for stochastic control ***,when the stochasticsystems degenerate to deterministic systems,the algebraic criterion becomes the counterpart for thecomplete controllability of deterministic control systems.

关键词： Backward stochastic differential equation (BSDE) E-well-posedness Stochastic controlsystem stochastic exact controllability.

Supervised Identification Algorithm on Detection of Foreign Fibers in Raw Cotton

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Supervised Identification Algorithm on Detection of Foreign ...

Multiparty simultaneous quantum identity authentication with secret sharing

第24届中国控制与决策会议

作者： Ling Ouyang 1 , Hongtao Peng 2 , Dongyun Wang 3 ,Yongping Dan 4 , Fanghua Liu 5.1, 2, 3, 4, 5. school of Electrical and information, Zhongyuan University of Technology, Zhengzhou 45.007

Foreign fibers accounted for a small proportion in cotton, but there is serious impact on the quality of textile. Foreign fibers are removed by hand, which is low efficiency. Generally, the methods of fixed threshold are used to identify foreign fibers in cotton, but high speed flow of cotton is easy to result in fluctuations on light, the color of captured images will be changed accordingly, then misidentification possibility will be increased. But the suitable amount of sample libraries are used in the identification algorithm of supervised classification, which eliminate this defect to meet the requirements of accuracy and real-time. In this paper, according to the character of image gray of foreign fibers in cotton, and mathematical model is established. Further, important image features are enhanced by image processing, foreign fibers’ characters are drawn. At last, Euclidean distance and k-nearest neighbor classification are adopted in identification algorithm, and finally foreign fibers are identified.

关键词： foreign fibers identification Euclidean distance k-nearest neighbor classification algorithm

来源： cnki会议评论

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Science China(Physics,Mechanics & Astronomy) 2008年第3期51卷 321-327页

作者： YANG YuGuang1,2,WEN QiaoYan3 & ZHANG Xing4,5.1 College of Computer Science and Technology,Beijing University of Technology,Beijing 100022,China 2 State Key Laboratory of information Security (Graduate University of the Chinese Academy of Sciences),Beijing 100049,China 3 school of Science,Beijing University of Posts and Telecommunications,Beijing 100876,China 4 Institute of Electronic Technology,information Engineering University,Zhengzhou 45.004,China 5.Trusted Computing Laboratory,Beijing University of Technology,Beijing 100022,China College of Computer Science Technology Beijing University of Technology Beijing 100022 China State Key Laboratory of information Security [Graduate University of the Chinese Academy of Sciences] Beijing 100049 China school of Science Beijing University of Posts Telecommunications Beijing 100876 China Institute of Electronic Technology Information Engineering University Zhengzhou 450004 China Trusted Computing Laboratory Beijing University of Technology Beijing 100022 China

Two multiparty simultaneous quantum identity authentication (MSQIA) protocols based on secret sharing are presented. All the users can be authenticated by a trusted third party (TTP) simultaneously. In the first protocol,the TTP shares a random key K with all the users using quantum secret sharing. The ith share acts as the authentication key of the ith user. When it is necessary to perform MSQIA,the TTP generates a random number R secretly and sends a sequence of single photons encoded with K and R to all the users. According to his share,each user performs the corresponding unitary operations on the single photon sequence sequentially. At last,the TTP can judge whether the impersonator exists. The sec-ond protocol is a modified version with a circular structure. The two protocols can be efficiently used for MSQIA in a network. They are feasible with current technol-ogy.

关键词： quantum identity authentication secret sharing quantum cryptography

Theory study of shapes in ^(187,189)Tl nuclei

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Science China(Physics,Mechanics & Astronomy) 2009年第6期52卷 818-821页

作者： LIU YanXin1, YU ShaoYing1,2,3, SHEN CaiWan1,5.& DONG YongSheng1,2,4 1 school of Science, Huzhou Teachers College, Huzhou 313000, China 2.school of Science and information Engineering, Zhejiang Normal University, Jinhua 321000, China 3 Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, China 4 Department of Physics, Jining Teachers College, Jining 012000, China 5.Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, China school of Science Huzhou Teachers College Huzhou 313000 China school of Science and information Engineering Zhejiang Normal University Jinhua 321000 China Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100080 China Department of Physics Jining Teachers College Jining 012000 China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 China

The nuclear shapes of 187,189Tl were investigated theoretically in this work. The total routhian surface (TRS) calculations were performed for N=106 and 108 isotopes of thallium (Z=81). The single-particle energies were obtained from the deformed Woods-Saxon potential, with the Lipkin-Nogami (LN) treatment of pairing. It is found that the collective oblate rotation coexists with the high-K prolate rotation. Superdeformed prolate rotation is included in this calculation.

关键词： nuclear shape oblate rotation prolate rotation

The study of energy bands in nucleus ^(102)Zr

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Science China(Physics,Mechanics & Astronomy) 2010年第1期53卷 106-110页

作者： DONG GuoXiang 1,2 , YU ShaoYing 1,2,3 , LIU YanXin 1 , SHEN CaiWan 1,2,4 & DONG YongSheng 1,2,5. school of Science, Huzhou Teachers College, Huzhou 313000, China 2.school of Science and information Engineering, Zhejiang Normal University, Jinhua 321000, China 3 Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, China 4 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, China 5.Department of Physics, Jining Teachers College, Jining 012000, China 1. school of Science Huzhou Teachers College Huzhou 313000 China2. School of Science and Information Engineering Zhejiang Normal University Jinhua 321000 China3. Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100080 China4. Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 China5. Department of Physics Jining Teachers College Jining 012000 China

Theoretical calculations of the energy bands in nucleus 102 Zr are carried out by taking the projected shell model approach, which has reproduced the experimental data. In addition, by analyzing band-head energies, corresponding configurations of yrast band, quasi-particle rotational bands and side bands, we have worked out the microscopic formation mechanism of axially symmetric deformation bands: The low-excitation deformation bands are attributed to the high-j intruder states 1g 7/2 and 1h 11/2 in the N=4, 5.shells; the quasi-particles in the orbit v5.2-[5.2], v3/2+[411] and v3/2+[413] in particular play an important role in the deformation of 102 Zr.

关键词： projected shell model yrast band quasi-particle rotational band side band

Anticoagulation property and security of artificial heart valve material

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Science China(Technological Sciences) 2005年第2期48卷 145-162页

作者： WANG Xianghui1, , LIU Xianghuai1,22, 3, ZHANG Feng2, LI Changrong2, YU Liujiang2, ZHENG Zhihong2, WANG Xi2, JIANG Zhenbin4, CHEN Anqing4 & XU Jingfang3 1. Department of Physics, East China Normal University, Shanghai 200062, China 2. Ion Beam Lab, Shanghai Institute of Mini-system and information, Chinese Academy of Sciences,Shanghai 20005., China 3. Department of electronics, school of information Science and Technology, East China Normal Univer- sity, Shanghai 200062, China 4. Shanghai Cardiovascular Institute, Zhongshan Hospital, Shanghai 200032, China 1. Department of Physics East China Normal University 200062 Shanghai China 2. Ion Beam Lab Shanghai Institute of Mini-system and information Chinese Academy of Sciences 200050 Shanghai China 3. Department of electronics School of Information Science and Technology East China Normal University 200062 Shanghai China 4. Shanghai Cardiovascular Institute Zhongshan Hospital 200032 Shanghai China

Heart valve diseases threaten human health. One reliable way to save lives of such patients is to replace the pathologically changed heart valves by artificial ones. Over 2 million patients have received LTI-carbon heart valve’s implantation. However, the thrombosis after the implantation is one of the difficulties that need to be solved. In order to improve the blood compatibility and security of mechanical heart valves, ion beam technology was used to modify the surface properties of the materials. The investigation results have been summarized in this paper.

关键词： artificial heart valve, ion implantation, plasma immersed ion implantation, ion beam enhanced deposition.

Influence of p-layer on the performance of n-i-p μc-Si:H thin film solar cells

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Science China(Physics,Mechanics & Astronomy) 2010年第11期53卷 2042-2046页

作者： YUAN YuJie 1,2,ZHANG KaiLiang 1,2,WEI Zhen 1,2 & GENG XinHua 3 1 College of electronics information Engineering,Tianjin University of Technology,Tianjin 300384,China 2 Tianjin Key Laboratory of Film Electronic and Communication Devices,Tianjin University of Technology,Tianjin 300384,China 3 Institute of Photo-electronics Thin Film Devices and Technique,Nankai University,Tianjin 300071,China 1. College of electronics information Engineering Tianjin University of Technology Tianjin 300384 China2. Tianjin Key Laboratory of Film Electronic and Communication Devices Tianjin University of Technology Tianjin 300384 China3. Institute of Photo-Electronics Thin Film Devices and Technique Nankai University Tianjin 300071 China

The high pressure radio frequency plasma enhanced chemical vapor deposition (RF-PECVD) process was adopted to prepare the n-i-p microcrystalline silicon solar cells,the influence of p-type layers on the performance of the solar cells was investigated,and the optimum p layer suited to the n-i-p microcrystalline silicon solar cells was *** experimental results demonstrate that the performance of the solar cells can be highly affected by the structural and optical properties of the p-layers,and the performance of solar cells can be greatly improved by optimizing p *** have achieved an initial active-area efficiency of 8.17% (V oc =0.49 V,J sc =24.9 mA/cm 2 ,FF=67%) for the μc-Si:H single-junction n-i-p solar cells and an initial active-area efficiency of 10.93% (V oc =1.31 V,J sc =13.09 mA/cm 2 ,FF=64%) for the a-Si:H/μc-Si:H tandem n-i-p solar cells.

关键词： microcrystalline silicon solar cells quantum confinement effect p-type layers

The impact of time synchronization error on passive coherent pulsed radar system

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Science China(information Sciences) 2010年第12期53卷 2664-2674页

作者： HE You 1,ZHANG CaiSheng 1,2,DING JiaHui 2 & TANG XiaoMing 1 1 Research Institute of information Fusion,Naval Aeronautical and Astronautical University,Yantai 264001,China 2 Nanjing Research Institute of electronics Technology,Nanjing 210039,China 1. Research Institute of information Fusion Naval Aeronautical and Astronautical University Yantai 264001 China2. Nanjing Research Institute of Electronics Technology Nanjing 210039 China

Passive bistatic coherent radar system operates with distinct non-cooperative transmitter and receiver located at different *** such spatial separation,the receiving system needs to independently solve the problem of time and phase synchronization via direct-path *** impact of time synchronization error was explored and solved in passive bistatic coherent *** common model of digital sampling process is introduced to illustrate the effect of time synchronization error(TSE).The periodicity of relative sample instant variation of each pulse is ***,normalized interference power(NIP) is defined to evaluate the potential impact of *** NIP expressions are derived when the difference between the adjacent relative sample instant is uniform distribution or Gaussian *** is found that there are new spurious frequency components and the detection performance is decreased in the case of asynchronous *** the same time,the analytical Doppler frequency bias expression caused by TSE is *** results are confirmed by simulation in the cases of different periods of relative sampling instant.

关键词： passive coherent radar(PCR) time synchronization error(TSE) normalized interference power(NIP)

On degrees of freedom of the cellular network

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Science China(information Sciences) 2010年第05期53卷 1034-1043页

作者： SUN Jun 1,2 , LIU YingZhuang 1,2 & ZHU GuangXi 1,2 1 Department of electronics and information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China 2 Division of Optical Network and Intelligent Communication, Wuhan National Laboratory for Optoelectronics, Wuhan 430074, China 1. Department of electronics and information Engineering Huazhong University of Science and Technology Wuhan 430074 China2. Division of Optical Network and Intelligent Communication Wuhan National Laboratory for Optoelectronics Wuhan 430074 China

In this paper, we consider the capacity limits of the cellular network by modeling it as consisting of two mutually interfering multiple access channels with multiple antennas at each receiver (e.g., base station). By developing a tight outerbound as well as an achievable scheme which exploits the idea of interference alignment, we are able to exactly characterize the sum degrees of freedom (DoF) of the network when the channel coefficients are timeor frequency-varying, which equals KM K+min(M,K) (where M and K denote the number of receiver antennas and number of users in per cell, respectively) per cell. From the DoF result, it can be observed that in addition to the multi-user gain which has been reported for the network with single-antenna BSs, there also exists the multi-antenna gain in the cellular network. In particular, when the number of users is large, we can nearly achieve the interference-free DoF of a cellular network with multiple-antenna BSs, which is a somewhat surprising result.

关键词： capacity degrees of freedom cellular network interference alignment interference channel MIMO