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Spatio-temporal evolution of Beijing 2003 SARS epidemic

Science China Earth Sciences 2010年第7期53卷 1017-1028页

作者： CAO ZhiDong ZENG DaJun ZHENG XiaoLong WANG QuanYi WANG FeiYue WANG JinFeng WANG XiaoLi Key Laboratory of Complex Systems and Intelligence Science Institute of AutomationChinese Academy of SciencesBeijing 100190China Beijing Center for Disease Control and Prevention Beijing 100013China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

Studying spatio-temporal evolution of epidemics can uncover important aspects of interaction among people, infectious diseases, and the environment, providing useful insights and modeling support to facilitate public health response and possibly prevention measures. This paper presents an empirical spatio-temporal analysis of epidemiological data concerning 2321 SARS-infected patients in Beijing in 2003. We mapped the SARS morbidity data with the spatial data resolution at the level of street and township. Two smoothing methods, Bayesian adjustment and spatial smoothing, were applied to identify the spatial risks and spatial transmission trends. Furthermore, we explored various spatial patterns and spatio-temporal evolution of Beijing 2003 SARS epidemic using spatial statistics such as Moran’s I and LISA. Part of this study is targeted at evaluating the effectiveness of public health control measures implemented during the SARS epidemic. The main findings are as follows. (1) The diffusion speed of SARS in the northwest-southeast direction is weaker than that in northeast-southwest direction. (2) SARS’s spread risk is positively spatially associated and the strength of this spatial association has experienced changes from weak to strong and then back to weak during the lifetime of the Beijing SARS epidemic. (3) Two spatial clusters of disease cases are identified: one in the city center and the other in the eastern suburban area. These two clusters followed different evolutionary paths but interacted with each other as well. (4) Although the government missed the opportunity to contain the early outbreak of SARS in March 2003, the response strategies implemented after the mid of April were effective. These response measures not only controlled the growth of the disease cases, but also mitigated the spatial diffusion.

关键词： severe acute respiratory syndrome (SARS) Beijing morbidity rate spatial analysis spatio-temporal evolution control measures

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Identification of interval models for a class of uncertain systems via linear programming

Identification of interval models for a class of uncertain s...

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作者： Zhang, Guozhu Chen, Jie Li, Zhiping Key Laboratory of Complex System Intelligent Control and Decision Beijing Institute of Technology School of Automation Beijing 100081 China

ISBN: (纸本)9781424474264

The interval models of uncertain plants are frequently used in the field of robust control. In this paper, a novel interval model identification method based on linear programming is proposed. By certain prepossessing on the measured data of the plant, the interval model identification problem is transformed into several linear programming problems, which can be easily solved through various algorithms. We have proved that the resultant interval model has a known error bound, provided that certain conditions on the measured data are satisfied. To demonstrate its effectiveness, the proposed method is applied to identify the interval model of a servo system with variant load and inertia. © 2010 AACC.

关键词： Linear programming

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Design and realization of a remote monitoring and diagnosis and prediction system for large rotating machinery

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中国高等学校学术文摘·机械工程 2010年第2期5卷 165-170页

作者： Shaohong WANG Tao CHEN Jianghong SUN School of Mechanical Vehicular Engineering Beijing Institute of Technology Beijing 100081 China Beijing Key Laboratory on Measurement and Control of Mechanical and Electrical System Beijing Information Science & Technology University Beijing 100192 China

Traditional on-site fault diagnosis means cannot meet the needs of large rotating machinery for its performance and complexity. Remote monitoring and diagnosis technology is a new fault diagnosis mode combining computer technology, communication technology, and fault diagnosis technology. The designed remote monitoring and diagnosis and prediction system for large rotating machinery integrates the distributed resources in different places and breaks through shortcomings as the offline and decentralized information. The system can make further implementation of equipment prediction technology research based on condition monitoring and fault diagnosis, provide on-site analysis results, and carry out online actual verification of the results. The system monitors real-time condition of the equipment and achieves early fault prediction with great significance to guarantee safe operation, saves maintenance costs, and improves utilization and management of the equipment.

关键词： large rotating machinery remote monitoring fault diagnosis prediction system

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带马尔科夫跳的模态相关时变时滞随机系统的状态反馈控制器设计(英文)

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自动化学报 2010年第11期36卷 1601-1610页

作者：马莉达飞鹏吴凌尧 Key Laboratory of Measurement and Control for Complex Systems of Engineering Ministry of EducationResearch Institute of AutomationSoutheast University College of Electronic and Information Engineering Jiangsu University

In this paper,an improved mean-square exponential stability condition and delayed-state-feedback controller for stochastic Markovian jump systems with mode-dependent time-varying state delays are obtained. First,by constructing a modified Lyapunov-Krasovskii functional,a mean-square exponential stability condition for the above systems is presented in terms of linear matrix inequalities (LMIs). Here,the decay rate can be a finite positive constant in a range and the derivative of time-varying delays is only required to have an upper bound which is not required to be less than 1. Then,based on the proposed stability condition,a delayed-state-feedback controller is designed. Finally,numerical examples are presented to illustrate the effectiveness of the theoretical results.

关键词：马尔科夫跳模态相关时变时滞随机系统状态反馈控制器

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Stator Flux Oriented control with Improved Integrator for Speed-Sensorless Induction Motor Drives

Stator Flux Oriented Control with Improved Integrator for Sp...

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International Conference on E-Product E-Service and E-Entertainment

作者： Hao Zhang Xianzhong Dai Key Laboratory of Measurement and Control of Complex system of Engineering Ministry of Education South-East University Nanjing China

ISBN: (纸本)9781424471591

This paper presents a speed-sensorless control algorithm for induction motors, based on the stator flux-oriented control. The algorithm has the advantage of insensitivity to rotor parameters and load varying, stator flux and rotor speed is closed loop controlled respectively. The main improvement is that stator flux is estimated based on a modified integrator which is developed to solve the problems associated with pure integrator. The performance of the proposed algorithm is verified using a dSPACE system with DS1103 controller board based on the digital signal processor (DSP) TMS320F240. The experimental results show the estimated speed is true of exactly actual speed and good behavior of the drive in both transient and steady state low-speed operating conditions is proved.

关键词： Stators Rotors Induction motors Inductance Resistance Observers

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PID neural network control of a membrane structure inflation system

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机械工程前沿 2010年第4期5卷 418-422页

作者： Qiushuang LIU Xiaoli XU School of Mechanical & Vehicular Engineering Beijing Institute of Technology Beijing 10081China Beijing Key Laboratory (Measurement and Control of Mechanical and Electrical System) Beijing Information Science & Technology University Beijing 100081China

Because it is difficult for the traditional PID algorithm for nonlinear time-variant control objects to obtain satisfactory control results, this paper studies a neuron PID controller. The neuron PID controller makes use of neuron self-learning ability, complies with certain optimum indicators, and automatically adjusts the parameters of the PID controller and makes them adapt to changes in the controlled object and the input reference signals. The PID controller is used to control a nonlinear time-variant membrane structure inflation system. Results show that the neural network PID controller can adapt to the changes in system structure parameters and fast track the changes in the input signal with high control precision.

关键词： PID neural network membrane structure

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Improved Fourier transform profilometry based on color pattern projection

Improved Fourier transform profilometry based on color patte...

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Chinese Conference on Pattern Recognition

作者： Huang, Hao Da, Feipeng Key Laboratory of Measurement and Control for Complex System of Ministry of Education Institute of Automation Southeast University Nanjing 210096 China

ISBN: (纸本)9781424472109

In this paper a novel 3D shape measurement technique based on color fringe projection is proposed to solve the spectrum aliasing and phase unwrapping issues existed in Fourier transform profilometry. Set the RG components of the color fringe to two different frequencies of sinusoidal pattern and the B component to the average value of R or G component. Then project the pattern to the object. Separate these RGB components of the captured color pattern and use our method to process these three gray patterns. By using the proposed method, the background and high frequency noises can be eliminated during FTP process, also the accurate unwrapped phase which contains the height information can be got by using two frequencies of wrapped phase to unwrap the phase. Only one frame color pattern is needed to get the 3D information of an object. Experiment results show that the 3D information of an object can be obtained rapidly and accurately using the proposed method. And also the object can be measured dynamically. ©2010 IEEE.

关键词： Fourier transforms

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A New Accurate Method of Compensating Phase-Shifting Error

A New Accurate Method of Compensating Phase-Shifting Error

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Chinese Conference on Pattern Recognition (CCPR)

作者： Lin Zhu Feipeng Da Shaoyan Gai Key Laboratory of Measurement and Control of Complex System of Ministry of Education College of Automation South-East University Nanjing China

A new accurate phase-shifting error compensating algorithm for phase-measuring profilometry is proposed and proved. In this error detecting algorithm, we use three adjacent phase points for research object, approximately suppose that the sinusoidal fringe projection to the plate, the phase differences between adjacent pixels are equal. Then we put the phase shift error into the original algorithm for error compensation. Simulation results show the inhibitory effect of the errors after using the new algorithm for error compensation. Lastly we use the new algorithm for three-dimensional reconstruction of physical measurement. The final effect image shows obviously that the new compensation algorithm is better than the original. So this error extracting algorithm can effectively improve the accuracy of three-dimensional measurement.

关键词： Optimized production technology Phase shifting interferometry Algorithm design and analysis Optical interferometry measurement uncertainty Phase measurement Approximation algorithms

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A new accurate method of compensating phase-shifting error

A new accurate method of compensating phase-shifting error

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Chinese Conference on Pattern Recognition

作者： Zhu, Lin Da, Feipeng Gai, Shaoyan Key Laboratory of Measurement and Control for Complex System of Ministry of Education Colledge of Automation Southeast University Nanjing 210096 China

ISBN: (纸本)9781424472109

关键词： Error compensation

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Improved Fourier Transform Profilometry Based on Color Pattern Projection

Improved Fourier Transform Profilometry Based on Color Patte...

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Chinese Conference on Pattern Recognition (CCPR)

作者： Hao Huang Feipeng Da Key Laboratory of Measurement and Control of Complex System of Ministry of Education Institute of Automation South-East University Nanjing China

关键词： Fourier transforms Color Shape measurement Charge coupled devices Three dimensional displays measurement by laser beam

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