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High performance hardware architecture for sparse signal reconstruction based on systolic array

Journal of Computational Information Systems 2014年第24期10卷 10611-10622页

作者： Chen, Zhenzhen Jiang, Yuanda Wang, Chao Yu, Wenkai Zheng, Fu Sun, Zhibin Zhai, Guangjie Key Laboratory of Electronics and Information Technology for Space Systems Center for Space Science and Applied Research Chinese Academy of Sciences Beijing China School of Computer and Control Engineering University of Chinese Academy of Sciences Beijing China School of Physics Beijing Institute of Technology Beijing China

Compressed sensing realizes the sub-sampling of the sparse signal but with high computational effort. For this, many hardware implementations based on Orthogonal Matching Pursuit (OMP) algorithm have been researched, avoiding the direct matrix inversion calculation by Cholesky or QR decomposition. However, the computational complexity is still high, and the reconstruction precision is poor, which is unfavorable for extension. In order to address this problem, a high performance hardware implementation was proposed in this paper which used Coordinate Rotation Digital computer (CORDIC) method constituting a systolic array to perform QR decomposition. This hardware architecture improves systolic array module and corresponding scheduling processing module by adding delay units, and can recover an 8-sparse signal of column dimension 256 in the order of columns, with the speed nearly 13 times faster than the software. Meanwhile, since the mean square error has a boltzmann relationship with the sparsity of the signals, the hardware performs well when the sparsity is below 8. Moreover, the curve fittings for software and hardware match well further proves the reconstruction ability of this hardware architecture. Finally, based on this hardware structure, a single photon imaging system was constructed, showing that, it can significantly speed up the imaging speed.

关键词： Compressed sensing

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Distributed parameter modeling of single-mast stacker crane structures

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Periodica Polytechnica Transportation engineering 2014年第1期42卷 1-9页

作者： Hajdu, Sándor Gáspár, Péter Department of Mechanical Engineering University of Debrecen Ótemeto u. 2-4. H-4028 Debrecen Hungary Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 H-1111 Budapest Hungary

This paper presents distributed parameter dynamical modeling capabilities of single-mast stacker crane structures. In the frame structure of stacker cranes due to external excitation or inertial forces undesirable structural vibrations may arise. These vibrations reduce the stability and positioning accuracy of stacker crane and causes increasing cycle time of storage/ retrieval operation. Thus it is necessary to investigate of these vibrations. In this paper the dynamical behavior of single-mast stacker cranes is approximated by means of distributed parameter models. The first model is a cantilever beam model with uniform material and cross-sectional properties. This model is used to demonstrate fundamental properties of Euler-Bernoulli beam models. The second model is cantilever beam model with variable cross-sectional properties and lumped masses. The eigenfrequencies and mode shapes of this mast-model are determined by means transfer matrix method. In the third model the whole structure of single-mast stacker crane is modeled. Beside the eigenfrequencies and mode shapes of this model the Bodediagrams of frequency response function is also calculated.

关键词： Cantilever beams

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The Chinese ‘‘HumanFlesh’’ Web:the first decade and beyond

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Chinese Science Bulletin 2014年第26期59卷 3352-3361页

作者： Fei-Yue Wang Daniel Zeng Qingpeng Zhang James A. Hendler Jianping Cao The State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences Department of Management Information Systems The University of Arizona Tucson Department of Systems Engineering and Engineering Management City University of Hong Kong Tetherless World Constellation Department of Computer Science Rensselaer Polytechnic Institute Troy The Research Center for Computational Experiments and Parallel Systems National University of Defense Technology

Human flesh search(HFS), a Web-enabled crowdsourcing phenomenon, originated in China a decade ago. In this article, we present the first comprehensive empirical analysis of HFS, focusing on the scope of HFS activities, the patterns of HFS crowd collaboration process, and the characteristics of HFS participant networks. A survey of HFS participants was conducted to provide an in-depth understanding of the HFS community and various factors that motivate these participants to contribute. This article also advocates a new stream of Web science and social computing research that will be important in predicting the future growth and use of the World Wide Web.

关键词：中国人网址肉 Web功能实证分析参与者共同体万维网

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Online Optimal control for VTOL Aircraft System Based on DHP Algorithm 33

Online Optimal Control for VTOL Aircraft System Based on DHP...

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第三十三届中国控制会议

作者： TAN Fuxiao LIU Derong GUAN Xinping The School of Computer and Information Fuyang Teachers College The State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences The School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University

ISBN: (纸本)9781479947249

It is well known that vertical take-off and landing(VTOL) aircraft system is a complex multi-variable nonlinear system with large disturbances. In order to control the VTOL aircraft system ef ciently, it is necessary to explore new optimal control methods to stabilize the system states. In this paper, we apply dual heuristic programming(DHP) to design the optimal controller for VTOL aircraft system. As a framework of approximate dynamic programming(ADP) algorithm, DHP consists of three modules: model, critic and actor. The critic module output partial derivatives of cost function with respect to state. It has many advantages such as good dynamics, fast convergence rate, and high control resolution. Simulation and experimental results demonstrate the effectiveness of optimal controller for VTOL aircraft system based on the DHP algorithm.

关键词： VTOL aircraft,Dual heuristic programming,Adaptive critic designs,Optimal control

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Effect of source tampering in the security of quantum cryptography

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Physical Review A 2015年第2期92卷 022304-022304页

作者： Shi-Hai Sun Feihu Xu Mu-Sheng Jiang Xiang-Chun Ma Hoi-Kwong Lo Lin-Mei Liang College of Science National University of Defense Technology Changsha 410073 China Center for Quantum Information and Quantum Control Department of Electrical and Computer Engineering and Department of Physics University of Toronto Toronto Ontario M5S 3G4 Canada Research Laboratory of Electronics Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge Massachusetts 02139 USA State Key Laboratory of High Performance Computing National University of Defense Technology Changsha 410073 China

The security of source has become an increasingly important issue in quantum cryptography. Based on the framework of measurement-device-independent quantum key distribution (MDI-QKD), the source becomes the only region exploitable by a potential eavesdropper (Eve). Phase randomization is a cornerstone assumption in most discrete-variable (DV) quantum communication protocols (e.g., QKD, quantum coin tossing, weak-coherent-state blind quantum computing, and so on), and the violation of such an assumption is thus fatal to the security of those protocols. In this paper, we show a simple quantum hacking strategy, with commercial and homemade pulsed lasers, by Eve that allows her to actively tamper with the source and violate such an assumption, without leaving a trace afterwards. Furthermore, our attack may also be valid for continuous-variable (CV) QKD, which is another main class of QKD protocol, since, excepting the phase random assumption, other parameters (e.g., intensity) could also be changed, which directly determine the security of CV-QKD.

关键词： Quantum cryptography

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Dynamic anti-windup design for anticipatory activation:enlargement of the domain of attraction

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Science China(Information Sciences) 2014年第1期57卷 164-177页

作者： WU XiongJun LIN Zongli Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information ProcessingMinistry of Education of China The 802 Institute of Shanghai Academy of Space Flight Technology The Eighth Academy of China Aerospace Science and Technology Corporation Charles L. Brown Department of Electrical and Computer Engineering University of Virginia

Traditional anti-windup compensators are designed for activation immediately at the occurrence of actuator ***,anti-windup compensators were designed for actuation either after the saturation has reached a certain level or in anticipation of its *** the case of static anti-windup compensators,it has been shown that an anti-windup compensator designed for activation in anticipation of actuator saturation would lead to better performance than those designed for immediate or delayed activation could,both in terms of transient performance and the size of the domain of *** recently,it has been shown that a dynamic anti-windup compensator designed for anticipatory activation would also result in better transient performance than those designed for immediate or delayed activation *** this paper,we design dynamic anti-windup compensators for the enlargement of the domain of *** compensators are designed respectively for immediate,delayed and anticipatory *** will show by simulation that a dynamic anti-windup compensator designed for anticipatory activation would result in a larger domain of attraction than a dynamic anti-windup compensator designed for immediate or delayed activation could.

关键词： actuator saturation anti-windup anticipatory activation domain of attraction dynamic com-pensator

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Maximum likelihood estimation based DINA model and Q-matrix learning 1

Maximum likelihood estimation based DINA model and Q-matrix ...

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2014 1st IEEE International Conference on Behavioral, Economic, Socio-Cultural Computing, BESC 2014

作者： Sun, Yuan Ye, Shiwei Shi, Huiyang Wang, Haobo Sun, Yi National Institute of Informatics Hitotsubashi Chiyoda-ku Tokyo2-1-2 Japan School of Electronic and Communication Engineering University of China Academy of Science China School of Computer and Control Engineering University of China Academy of Science China

ISBN: (纸本)9781479969807

Cognitive diagnosis models (CDMs) are of growing interest in test development and in the measurement of human performance. The DINA (deterministic input, noisy, and gate) model has been widely used in cognitive diagnosis tests and in the process of test development. Central to many such models, the well-known Q-matrix [1], which specifies the item-attribute relationships and two noise parameters in DINA model related to item response functions are termed as slip and guessing. Slip parameter indicates a student with mastery of all of the attributes that an item requires fails to answer the item correctly. In contrast, guessing parameter indicates a student lacks the attributes that are required by an item but succeeds to answer the item correctly. In this paper, we developed a new method and presented an alternate recursive algorithm to learn Q-matrix and uncertainty variables slip and guessing based on Boolean Matrix Factorization (BMF) and Maximum Likelihood Estimation (MLE) respectively for DINA model of CDM. In particularly, we spontaneously transferred the deterministic Q-matrix learning problem into BMF problem. Because BMF is an NP-hard problem [2], we proposed an alternate recursive method to find approximate solution by adding one dimension in attribute latent space in each step. On the other hand, we analytically estimated the slip and guessing parameters through the maximum likelihood of uncertainty variables. The optimum process is alternate recursive between latent attribute space and uncertainty variable space. Simulation results show that the MLE Q-matrix learning algorithm has fast convergence to the optimal solution under suitable initial values of Qinit and Ainit. This is extremely important and applicable when the method is extended to big data. © 2014 IEEE.

关键词： Maximum likelihood estimation

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Synchronising second-order multi-agent systems under dynamic topology via reference model-based algorithm

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Journal of control and Decision 2014年第3期1卷 214-225页

作者： Jiahu Qin Huijun Gao Tasawar Hayat Fuad E.Alsaadi Department of Automation University of Science and Technology of ChinaHefeiChina Research School of Engineering Australian National UniversityCanberraAustralia Research Institute of Intelligent Control and Systems Harbin Institute of TechnologyHarbinChina Nonlinear Analysis and Applied Mathematics Group King Abdulaziz University(KAU)JeddahSaudi Arabia Faculty of Engineering Department of Electrical and Computer EngineeringKing Abdulaziz UniversityJeddahSaudi Arabia Department of Mathematics Quaid-I-Azam UniversityIslamabadPakistan

This paper revisits the synchronisation problem for second-order multi-agent systems(MASs)under dynamically changing communication *** employing the reference model-based synchronisation algorithm,it is finally shown that synchronisation for both the position and velocity states can be achieved if the union of the communication topologies has a directed spanning tree frequently *** extends the existing results obtained for second-order MASs which exploits mild communication topology condition guaranteeing the synchronisation to a more general *** analysis is successfully performed by exploiting the product properties of row-stochastic matrices,which can also provide us with an estimate the convergence rate towards the synchronisation.

关键词： synchronisation double-integrator agents weakest possible communication topology rate of convergence

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A Novel Frequency Regulation Strategy with the Application of Energy Storage System for Large Scale Wind Power Integration

A Novel Frequency Regulation Strategy with the Application o...

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IEEE Green Technologies Conference (IEEE-Green)

作者： Linlin Wu Wenzhong Gao Zhengpai Cui Xiao Kou Dept. of Smart Grid and Renewable Resource Tech. State Grid Jibei Electric Co. Ltd. Research Institute Beijing China Electric Power Dispatching and Control Center State Grid Jibci Electric Co. Ltd Beijing China Dept. Electrical and Computer Engineering University of Denver Denver Colorado USA

ISBN: (纸本)9781479988853

Integration of large scale wind power is both economical and environmentally-friendly. However, stochasticity and intermittency of wind power bring new challenges to frequency stability issue of the wind power system. The frequency regulation capacity limitation of the power system is one of the most important reasons limiting integration capacity of wind power. The power output of energy storage system (ESS) can be regulated very rapidly. Hence, it is feasible and effective for ESS to participate in system frequency regulation. This will increase overall system frequency regulation capacity and thus helps accommodating more wind power integrated into the power grid. A novel strategy for ESS to participate in frequency regulation is proposed in this paper. The control strategy includes two stages: in the first stage, ESS regulates its power output based on the wind power prediction information, in the second stage, frequency feedback is used to regulate the ESS power output to further reduce steady state frequency deviation. Since the ESS power output can be regulated before the frequency deviation happens, the dynamic response speed of frequency regulation of ESS can be significantly improved. Besides, frequency deviation can be decreased thanks to the step command in the first stage. Simulation of a wind power system is performed in Real Time Digital Simualtor (RTDS) and the results show the effectiveness of the proposed method.

关键词： Frequency control Wind power generation Time-frequency analysis Energy storage Power system stability Steady-state Simulation

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Leaderless consensus in networks of flexible-joint manipulators 19

Leaderless consensus in networks of flexible-joint manipulat...

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19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Nuño, Emmanuel Valle, Daniela Sarras, Ioannis Basañez, Luis Department of Computer Science CUCEI University of Guadalajara Guadalajara Mexico Electronics Department CUCEI University of Guadalajara Guadalajara Mexico Automatic Control Department SUPELEC Gif-sur-Yvette France Institute of Industrial and Control Engineering Technical University of Catalonia Barcelona Spain

ISBN: (纸本)9783902823625

This work studies the leaderless consensus problem in networks composed of non-identical flexible-joint robot manipulators. Using standard functional analysis, i.e., Barbəlat's Lemma, it is established that a simple control law provides a solution to the leaderless consensus problem. The network is modeled as an undirected graph and the interconnection can exhibit variable time-delays. The proposed controller consists of two different terms, one that dynamically compensates the robot gravity and another which ensures the desired consensus objective. This last term is a simple Proportional plus damping scheme. Simulations, using a network with nine 2-degrees of freedom manipulators, are provided to support the theoretical contributions of this work. © IFAC.

关键词： Flexible manipulators

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