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Artificial Intelligence for Prognostics - Papers from the AAAI Fall Symposium

作者： Tang, Liang Kacprzynski, Gregory J. Goebel, Kai Reimann, Johan Orchard, Marcos E. Saxena, Abhinav Saha, Bhaskar Impact Technologies LLC 200 Canal View Blvd. Rochester NY 14623 United States Intelligent Control Systems Lab. Georgia Institute of Technology Atlanta GA United States NASA Ames Research Center Moffett Field CA United States

ISBN: (纸本)9781577353478

The term Automated Contingency Management (ACM) has been used to describe intelligent systems capable of mission re-planning and control reconfiguration based on information from health state diagnosis. While a diagnostics driven ACM capability designed to optimize multi-objective performance criteria remains a significant technical challenge, it is fundamentally a reactive paradigm. This paper introduces an automated contingency management paradigm based on both current heath state (diagnosis) and future health state estimates (prognosis). Including Prognostics in the control loop poses at least two additional challenges to ACM. First, future state prediction will, in general, have uncertainty that increases as the prediction horizon increases so adaptive prognosis routines that manage uncertainty are critical. Secondly, the larger time horizon afforded by prognosis requires ACM to be split into a real-time "reactive" component and a non-real time "planning" component. The latter considers temporal parameters and the potential impact of being proactive with mitigating action. The proactive ACM paradigm was developed and evaluated in the context of a generic mono-propellant system model in Simulink/Stateflow with diagnostics, prognostics and an optimal reconfigurable control system. Applications of Artificial Intelligence (AI) technologies in prognostics enhanced ACM system are briefly discussed. Preliminary results from on-going research work are presented. Copyright © 2007, Association for the Advancement of Artificial Intelligence (***). All rights reserved.

关键词： Simulink

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Spectral clustering based null space linear discriminant analysis (SNLDA)

Spectral clustering based null space linear discriminant ana...

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11th Pacific-Asia Conference on Knowledge Discovery and Data Mining, PAKDD 2007

作者： Wenxin, Yang Junping, Zhang Department of Electronic Engineering Fudan University Shanghai 200433 China Shanghai Key Lab. of Intelligent Information Processing Department of Computer Science and Engineering Fudan University Shanghai 200433 China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University China

ISBN: (纸本)9783540717003

While null space based linear discriminant analysis (NLDA) obtains a good discriminant performance, the ability easily suffers from an implicit assumption of Gaussian model with same covariance each class. Meanwhile, mixture model discriminant analysis, which is a good way for processing issues on multiple subclasses in each class, depends on human experience on the number of subclasses and has a highly complex iterative process. Considering the cons and pros of the two mentioned approaches, we therefore propose a new algorithm, called Spectral clustering based Null space Linear Discriminant Analysis (SNLDA). The main contributions of the algorithm include the following three aspects: 1) Employing a new spectral clustering method which can automatically detect the number of clusters in each class. 2) Finding a unified null space for processing multi-subclasses issues with eigen-solution technique. 3) Refining the calculation of the covariance matrix in a single sample subclass. The experimental results show the promising of the proposed SNLDA algorithm. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Clustering algorithms

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A new method of illumination invariant face recognition

A new method of illumination invariant face recognition

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2nd International Conference on Innovative Computing, Information and control, ICICIC 2007

作者： Wang, Juanjuan Wu, Lifang He, Xiaoguang Tian, Jie School of Electronic Information and Control Engineering Beijing University of Technology Beijing 100022 China Key Lab. of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences P.O.Box 2728 Beijing 100080 China

ISBN: (纸本)0769528821

In this paper the Morphological Quotient Image (MQI) based on close and open operation are compared, and the more effective operation is chosen. Furthermore, the influence of template size to recognition rate is studied. For different size of face images, the optimal template is obtained by experiment using Yale Face Database B. The optimal template is tested using CMU-PIE database and the experimental result is encouraging. © 2007 IEEE.

关键词： Face recognition

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A GENETIC APPROACH TO ANTI-AIR MISSILE control SYSTEM DESIGN

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IFAC Proceedings Volumes 2007年第7期40卷 61-66页

作者： Ali Reza Mehrabian Nastaran Nayebpanah Dynamic and Control Systems Lab. School of Mechanical Engineering University of Tehran Tehran Iran P.O.Box: 14875-347 Tehran Iran

Modern aircrafts and missiles with high manoeuvrability present an interesting challenge to autopilot design, which has activated new investigations in estimating the potential and applicability of recent theoretical control methods as well as how they can meet industrial demands. In this paper, a multi-objective approach for autopilot design is introduced. The design requirements are formulated using several integral criteria. A hybrid-genetic algorithm (GA) is employed to solve the nonlinear optimization problem. The obtained results are verified using nonlinear simulations in SIMULINK® which shows performance, stability and robustness of the designed flight controller.

关键词： Flight control Genetic algorithms PID controllers Nonlinear systems

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Preparation of TiO films by cathode multi arc ion and its performance

Preparation of TiO films by cathode multi arc ion and its pe...

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International Nano-Optoelectronic Workshop, iNOW

作者： Duojin, Fan Duowang, Fan Chenglong, Wang Lingxiao, Ming Lin, Zhao Hongzhong, Liu Lanzhou Dachen Automatic Control System Co. Ltd. Lanzhou 730070 China MOE Key Lab. of Opto-electronic Technology and Intelligence Control Lanzhou Jiaotong University Lanzhou 730070 China State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an 710049 China

TiO films were prepared by custom-made Cathode Multi Arc Ion equipment. Experimental test results reveal that our equipment can easly deposite big area scale TIO, particle size is in nanometer scale. © 2007 IEEE.

ISBN: (纸本)1424415918

关键词： Particle size

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Time-varying port-representation of dissipative structures with gauge transformations 9

Time-varying port-representation of dissipative structures w...

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2007 9th European control Conference, ECC 2007

作者： Nishida, Gou Yamakita, Masaki Luo, Zhi-Wei Institute of Physical and Chemical Research Bio-Mimetic Control Research Center Environment Adaptive Robotic Systems Lab. 2271-130 Anagahora Nagoya AichiN463-0003 Japan Department of Mechanical and Control Engineering Tokyo Institute of Technology 2-12-1 Oookayama Meguro-ku152-8552 Japan Department of Computer and Systems Engineering Kobe University 1-1 Rokkodai Nada-ku Hyogo657-8501 Japan

ISBN: (纸本)9783952417386

A distributed-port-Hamiltonian system is a generalized model for passivity-based controls. The system representation has been extended to an infinite-dimensional conservative system derived from variational calculus, which is called a field-port-Lagrangian system. A lot of practical systems for control engineering include dissipative elements;however such a non-conservative structure usually cannot be defined by a variational problem. This paper shows that a system with the dissipative structure can be defined as a time-varying fieldport-Lagrangian system by a gauge transformation. First, we show that the gauge transformation generates a time-dependent Lagrangian density functional that introduces the time-varying port-representation. Next, we present that a class of dissipative systems can be identified with a conservative system possessing an internal irreversible energy flow. Finally, we illustrate an equation of elastic films with viscosity damping with the time-varying port-representation. © 2007 EUCA.

关键词： Variational techniques

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New feedback-feedforward configuration for the iterative learning control of a class of discrete-time systems

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Zidonghua Xuebao/Acta Automatica Sinica 2007年第3期33卷 323-326页

作者： Hou, Zhong-Sheng Xu, Jian-Xin Advanced Control Systems Lab. School of Electronics and Information Engineering Beijing Jiaotong University Beijing 100044 China Department of Electrical and Computer Engineering National University of Singapore Singapore 117576 Singapore

This paper presents a new feedback-feedforward configuration for the iterative learning control (ILC) design with feedback, which consists of a feedback and a feedforward component. The feedback integral controller stabilizes the system, and takes the dominant role during the operation, and the feedforward ILC compensates for the repeatable nonlinear/unknown time-varying dynamics and disturbances, thereby enhancing the performance achieved by feedback control alone. As the most favorable point of this control strategy, the feedforward ILC and the feedback control can work either independently or jointly without making efforts to reconfigurate or retune the feedforward/feedback gains. With rigorous analysis, the proposed learning control scheme guarantees the asymptotic convergences along the iteration axis.

关键词： Learning systems

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System of systems approach to threat detection and integration of heterogeneous independently operable systems

System of systems approach to threat detection and integrati...

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2007 IEEE International Conference on systems, Man, and Cybernetics, SMC 2007

作者： Sahin, Ferat Sridhar, Prasanna Horan, Ben Raghavan, Vikraman Jamshidi, Mo IEEE Rochester Institute of Technology Rochester NY 14623 United States Department of Electrical and Computer Engineering University of Texas San Antonio San Antonio TX 78249 University of Texas San Antonio San Antonio TX 78249 Intelligent Systems Research Lab. Deakin University Geelong VIC 3217 Australia

ISBN: (纸本)1424409918

This paper presents a system of systems approach to threat detection through integration of heterogeneous independently operable systems. The approach is presented on a realistic situation where a human-controlled base robot, swarm robot(s), and sensors work together to obtain a decision about a possible threat in the environment. The base robot is remotely operated by a human using a haptic control system. The swarm robot(s) are autonomous and can accept directives from the base robot. Finally, sensors directly communicate with (report to) the base robot. In this scenario, heterogeneous systems and human interact in a system of systems architecture. With the inclusion of human expert and sensor verification of swarm robots, the system can successfully perform the threat detection and reduce the false alarms. Finally, a system of systems simulation framework including a base robot, a swarm robot, and two sensors is presented in addition to an experimental evaluation of the proposed SoS architecture. © 2007 IEEE.

关键词： Intrusion detection

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On end-to-end network clock offset compensation algorithm and its implementation

On end-to-end network clock offset compensation algorithm an...

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26th Chinese control Conference, CCC 2007

作者： Yunyi, Jia Bugong, Xu Shihua, Wang Buchun, Liu Lab. of Real-Time Control Through Internet and Fieldbuses College of Automation Science and Engineering South China Univ.of Technology Guangzhou 510640 China Lab. of Pattern Recognition and Intelligent System College of Information Engineering Beijing Univ. of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)7900719229

This paper addresses the problem of clock offset in end-to-end network time synchronization. Firstly, an algorithm for measuring the end-to-end clock offset is proposed. Secondly, the traditional linear-compensation method is analyzed and an algorithm to obtain the compensation line using least-squared algorithm is proposed. Finally, a new method of dynamic non-linear predicting compensation and its realization algorithm are proposed. Through experiments, it shows that the method of dynamic non-linear predicting compensation could compensate clock offset better than linear-compensation method. The superiority, validity and feasibility of the new method are proved.

关键词： Nonlinear systems

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Synthesis and photocatalytic capability of Cr-TiO2 film

Synthesis and photocatalytic capability of Cr-TiO2 film

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International Nano-Optoelectronic Workshop, iNOW

作者： Xiaojuan, Lu Duowang, Fan Duojin, Fan Hongzhong, Liu School of Automation and Electric Engineering Lanzhou Jiaotong University Lanzhou 730070 China MOE Key Lab. of Opto-electronic Technology and Intelligence Controll Lanzhou Jiaotong University Lanzhou 730070 China Lanzhou Dachen Automatic Control System Co. Ltd. Lanzhou 730070 China State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an 710049 China

A TiO2 catalyst doped by Cr was prepared by the sol-gel method and characterized by UV-2550 and FS. The results revealed that the Cr 6+-doped TiO2 film had the higher photocatalytic activity than pure TiO2 film. ©... 详细信息

ISBN: (纸本)1424415918

关键词： Sol-gel process

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