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Optimizing Hybrid control Trajectories by Model abstraction and Refinement

IFAC Proceedings Volumes 2009年第17期42卷 298-303页

作者： Tina Paschedag Michael Fall Olaf Stursberg Institute of Control and System Theory Dept. of Electrical Engineering and Computer Science University of Kassel Technische Universität München

Techniques for optimal control of hybrid systems have to consider the complex interaction of continuous and discrete dynamics and are required to limit the computational complexity arising from the corresponding search spaces. This contribution proposes an approach to computing hybrid optimal control trajectories based on an iterative model-abstraction and refinement scheme. The hybrid automaton is mapped to an abstract representation which is enriched by cost information gained from graph. Candidate solutions are computed on the abstract level and are mapped back to the level of the hybrid model, where they are validated. A refinement step guides the search for (sub-) optimal hybrid control trajectories. The proposed approach is implemented for the optimization of the start-up procedure for a chemical reactor.

关键词： hybrid systems optimal control abstraction model refinement graph search

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A study on the digital watermarking technique for JPEG 2000 09

A study on the digital watermarking technique for JPEG 2000

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International Conference on Convergence and Hybrid Information Technology 2009, ICHIT 2009

作者： Lim, Sung Jin Moon, Hae-Min Chung, Yongwha Pan, Sung Bum Dept. of Information and Communication Engineering Chosun Univ. 375 Seosuk-dong Dong-gu Gwangju 501-759 Korea Republic of Dept. of Computer and Information Science Korea Univ. Sejong Campus Jochiwon-eup Yeongigun Chungnam 339-700 Korea Republic of Dept. of Control Instrumentation and Robot Engineering Chosun Univ. 375 Seosuk-dong Dong-gu Gwangju 501-759 Korea Republic of

ISBN: (纸本)9781605586625

Recently, according to the number of Internet in widely use and the development of the related application, the distribution and use of multimedia contents, such as digital images, are very easy. Since these can modify as easy as use, multimedia contents need newly compressed JPEG 2000 and digital watermarking technique because of its enormous amount of information. To protect the digital image in real-time, this paper proposes two methods that Dual Watermarking Method (DWM) based JPEG 2000 and performing JPEG 2000 and watermarking synchronously. DWM consists of the robust and fragile watermarking. Also, in DWM, watermarks are carefully embedded avoiding the areas of Region Of Interest (ROI) and the edge of the digital image to protect the integrity of it. In performing JPEG 2000 and watermarking, it takes considerably less time to do JPEG 2000 and watermarking than when they are done separately. Based on the experimental results, it takes 0.72 second for JPEG 2000 and watermarking, and 1.11 second when they are done separately. © 2009 ACM.

关键词： Image segmentation

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A research for the optimization of MIPS instruction set simulation

A research for the optimization of MIPS instruction set simu...

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International Conference on computer Science & Education (ICCSE)

作者： Ming Liu Qixian Cai Dept. of Electronic Information and Control Engineering Guangxi University of Technology Liuzhou 545006 China Dept. of Computer Engineering Guangxi University of Technology Liuzhou 545006 China

The main idea of this article is through using Multi-level index and instruction abstract technology to improve the decode methods of the traditional MIPS instruction set simulation, The experiments show that this met... 详细信息

关键词： Decoding Computational modeling computer simulation Educational technology computer aided instruction Microprocessors computer science computer science education Optimization methods Printers

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A control theoretical approach to congestion control of TCP/AQM networks

A control theoretical approach to congestion control of TCP/...

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European control Conference (ECC)

作者： Teresa Alvarez Anuar Salim J.M. Maestre Department of Engineering Science and Automatic Control University of Valladolid Valladolid Spain Dept. de Ingeniería de Sistemas yAutomática University of Seville Spain

This paper shows how control techniques, such as PID or generalized predictive control, can improve the performance of TCP/IP networks when dealing with congestion. Drop tail, or more sophisticated AQM techniques such as RED, perform worse than process control techniques. A comparison between the different methods in different working scenarios is analyzed. Two different GPC controllers are evaluated. One considers the model resulting from on-line identification and the other is the linearization of the non-linear model.

关键词： Mathematical model Predictive control Predictive models Transfer functions Delays Feedback control Computational modeling

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A deterministic scheduling mechanism for industrial wireless networks

A deterministic scheduling mechanism for industrial wireless...

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9th International Conference on Electronic Measurement and Instruments, ICEMI 2009

作者： Li, TongBo Wang, Heng Wang, Ping Kim, Yeon Key Laboratory of Network Control and Intelligent Instrument Chongqing University of Posts and Telecommunications Ministry of Education Chongqing 400065 China Dept. of Computer Science and Engineering Konkuk University 1 Hwayang-dong Gwangjin-gu Seoul 143-701 Korea Republic of

ISBN: (纸本)9781424438624

In harsh industrial environment, industrial wireless networks need high quality performance at real-time, deterministic schedule, reliability and low-power consumption, and so on, or it will bring disastrous consequences to the industrial field. The existing industrial wireless network can not fundamentally solve the multi-hop network beacon collision, thus it will influence its real-time capability, the demand for certainty and reliability. This requires a method of scheduling uncertainties communications star-based network to standardize the channel access mechanisms, multi-hop network and to address the mutual interference, thus completing the tree network scheduling. So, the problem of beacon collision in Multi-hop network will be solved and it can be widely applied to industrial wireless network. ©2009 IEEE.

关键词： Time division multiple access

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Research and implementation of security mechanism in ISA100.11a networks

Research and implementation of security mechanism in ISA100....

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9th International Conference on Electronic Measurement and Instruments, ICEMI 2009

作者： Zhang, Xuan Wei, Min Wang, Ping Kim, Yeon Key Laboratory of Network Control and Intelligent Instrument Chongqing University of Posts and Telecommunications Ministry of Education Chongqing 400065 China Dept. of Computer Science and Engineering Konkuk University 1 Hwayang-dong Gwangjin-gu Seoul 143-701 Korea Republic of

ISBN: (纸本)9781424438624

The deployment of wireless technologies for device communication in the industrial control field is a challenging and promising issue mainly due to the increasing flexibility and the mobility. However, with limited resources such as computation capability and memory, traditional security solutions can not guarantee security requirements and communications overhead in industrial wireless networks. The ISA100.11a standard defines the protocol suite, system management, gateway, and security specifications for low-data-rate wireless connectivity with fixed, portable, and moving devices supporting very limited power consumption requirements. In this paper, the security architecture and security protocol stack for ISA100.11a networks are proposed. Furthermore, we survey security service measures to improve data confidentiality and integrity, and to prevent some attacks including reply attack. Finally, our test results show these security measures may enhance the security reliability of the ISA100.11a network communication. ©2009 IEEE.

关键词： Gateways (computer networks)

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Safety assessment for stochastic linear systems using enclosing hulls of probability density functions

Safety assessment for stochastic linear systems using enclos...

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European control Conference (ECC)

作者： Matthias Althoff Olaf Stursberg Martin Buss Institute of Automatic Control Engineering (LSR) Technische Universität München München Germany Dept. of Electrical Eng. University of Kassel Germany

This contribution addresses the problem of computing the probability that a linear system with uncertain inputs reaches an unsafe region in the state space. The probability of reaching unsafe states is bounded by an upper limit, by intersecting enclosing hulls of the probability density function for time intervals with the specified unsafe regions. Disturbances are modeled as white Gaussian noise, whose mean is modeled as uncertain within specified sets. This allows to consider white non-Gaussian noise in an over-approximative manner. The presented approach is efficient in the sense that high-dimensional systems can be handled.

关键词： Decision support systems Europe Ear Safety Linear systems Probability density function

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Optimization based synthesis of state derivative feedback controllers for retarded systems

Optimization based synthesis of state derivative feedback co...

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作者： McGahan, Paul Vyhlídal, Tomáš Michiels, Wim Dept. of Instrumentation and Control Eng. Faculty of Mechanical Engineering Czech Technical University in Prague Technická 4 166 07 Praha 6 Czech Republic Department of Computer Science Katholieke Universiteit Leuven Celestijnenlaan 200A B-3001 Heverlee Belgium

ISBN: (纸本)9783902661678

The paper presents an optimization based algorithm for stabilizing retarded systems using a state derivative feedback controller. It is shown that an application of such a controller results in neutral dynamics of the closed loop system if small feedback delays occur. Therefore, the strong stability theory of neutral systems needs to be considered in the controller synthesis problem. The stabilization approach is based on minimizing the spectral abscissa of the closed loop system over the controller parameter space, subject to a strong stability constraint. Copyright © 2009 IFAC.

关键词： Time delay

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Saving Electrical Power in a Surveillance Environment

Saving Electrical Power in a Surveillance Environment

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International Conference on Advances in Pattern Recognition (ICAPR)

作者： Souvik Sen Amit Kumar Das Shyama Prosad Chowdhury Department of Electrical & Computer Engineering Duke University USA CST Dept. BESU Shibpur Intelligent Systems & Control Queen''s University UK

This paper proposes a smart video surveillance system with real-time moving object (primarily human) detection and identification for solving the problem of excessive power consumption in indoor public places. The proposed detection system is able to handle several known constraints such as changing illumination conditions, occlusion, clutter or even irrelevant extraneous motion. It keeps track of the number of humans in the vicinity and takes measures to gradually increase or decrease the luminosity depending on the number of people within its sight.

关键词： Humans Object detection Video surveillance Lighting control systems Real time systems Object recognition Application software Video sequences Pattern recognition

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JPEG 2000 and Digital Watermarking Technique Using in Medical Image

JPEG 2000 and Digital Watermarking Technique Using in Medica...

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2009 Third IEEE International Conference on Secure Integration and Reliability Improvement SSIRI 2009(第三届IEEE安全软件集成及可信性改进国际会议)

作者： Sung-Jin Lim Seung-Hoon Chae Hae-Min Moon Yongwha Chung Sung Bum Pan Dept. of Information and Communication Engineering Chosun University Dong-gu Gwangju Korea Dept. of Information and Communication Engineering Chosun University Dong-gu GwangjuKorea Dept. of Computer and Information Science Korea University Chochiwon ChungnamKorea Dept. of Control Instrumentation and Robot Engineering Chosun University Dong-gu Gwangju Korea

ISBN: (纸本)9780769537580

The Picture Archiving and Communication System(PACS)was introduced for computerization of the medical system and telediagnosis between the hospital. It is becoming possible to create, store, and transmit medical images via PACS. There has been a growing interest in protecting medical images with an enormous amount of information. To improve transmission speed among the hospitals, the medical image should be compression JPEG 2000 by high compression ratio. This paper proposes an algorithM that utilizes both JPEG 2000 and robust watermarking for protection and compression of the medical image. With the proposed algorithm, it takes considerably less time to do JPEG 2000 and watermarking than when they are done separately. Based on the experiment results, it takes 0.72 second for the proposed algorithm and 1.11 second when they are done separately. We confirmed that the proposed algorithM was faster than when they are done separately.

关键词： Digital watermarking medical image JPEG 2000

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