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Conservatism-free Robust Stability Check of Fractional-order Interval Linear systems

IFAC Proceedings Volumes 2008年第2期41卷 15256-15261页

作者： Hyo-Sung Ahn YangQuan Chen Department of Mechatronics Gwangju Institute of Science and Technology (GIST) 1 Oryong-dong Buk-gu Gwangju 500-712 Korea Center for Self-Organizing and Intelligent Systems (CSOIS) Dept. of Electrical and Computer Engineering 4160 Old Main Hill Utah State University Logan UT 84322-4160 USA

This paper addresses a necessary and sufficient robust stability condition of fractional-order interval linear time invariant systems. The state matrix A is considered as a parametric interval uncertain matrix and fractional commensurate order is considered belonging to 1 ≤ α < 2. Using the existence condition of Hermitian matrix P = P * for a complex Lyapunov inequality, we show that a fractional-order interval linear system is robust stable if and only if there exist Hermitian matrices P = P * such that complex Lyapunov inequalities are satisfied for all vertex matrices, which is a set of selected matrices. Two numerical examples are presented to verify the validity of the proposed approach.

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Time delay estimation in a spatially structured model using decoupled estimators for temporal and spatial parameters

Time delay estimation in a spatially structured model using ...

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ITG Workshop on Smart Antennas

作者： Felix Antreich Josef A. Nossek Gonzalo Seco A. Lee Swindlehurst German Aerospace Center (DLR) Inst. for Communications and Navigation Wessling Germany Inst. for Circuit Theory & Signal Processing Munich University of Technology (TUM) Germany Department of Telecommunication & Systems Engineering Universitat Authnòma de Barcelona Spain Dept. of Telecommunications & Systems Engineering Universitat Autonoma de Barcelona (UAB) Spain Dept. of Electrical Engineering & Computer Science The University of California Irvine CA U.S.A.

This paper deals with the joint estimation of time-delay and spatial (direction-of-arrival, DOA) parameters of several replicas of a known signal in an unknown spatially correlated field. Unstructured and structured models have been proposed for maximum likelihood (ML) estimators in the literature. The former suffers from a severe performance degradation in some scenarios, whereas the latter involves huge complexity. It is shown how the extended invariance principle (EXIP) can be applied to obtain estimates with the quality of those of the structured model, but with the complexity of the unstructured one. We present a method to improve the quality of the time-delay estimates obtained with an unstructured spatial model when an estimate of the DOAs is available. Exemplarily, simulation results for time-delay estimation for GPS (Global Positioning System) are included and confirm that our proposal approaches the Cramer-Rao lower bound (CRLB) of the structured model even when suboptimal DOA estimates obtained by ESPRIT are introduced.

关键词： Delay estimation Delay effects

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Discrete-time Intermittent Iterative Learning Controller with Independent Data Dropouts

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IFAC Proceedings Volumes 2008年第2期41卷 12442-12447页

作者： Hyo-Sung Ahn Kevin L. Moore YangQuan Chen Department of Mechatronics Gwangju Institute of Science and Technology (GIST) 1 Oryong-dong Buk-gu Gwangju 500-712 Korea Division of Engineering Colorado School of Mines 1610 Illinois Street Golden CO 80401 USA Center for Self-Organizing and Intelligent Systems (CSOIS) Dept. of Electrical and Computer Engineering 4160 Old Main Hill Utah State University Logan UT 84322-4160 USA

In networked control systems (NCS), it is considered essential to design a robust controller such that the networked-system is stable against data dropouts during the network transfer. It has been shown that there is a critical data dropout rate over which the networked-system could be unstable; hence the desired task cannot be achieved. This paper shows that a desired task or trajectories can be still achieved even though there are feedback signal dropouts if the desired task is repetitive, as in the iterative learning control case. Specifically this paper shows how to design stochastic iterative learning control systems such that the networked-system with a repetitive task is robust stable against measurement and process noises and independent, intermittent output channel dropouts.

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Active mask segmentation for the cell-volume computation and Golgi-body segmentation of hela cell images

Active mask segmentation for the cell-volume computation and...

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IEEE International Symposium on Biomedical Imaging

作者： Gowri Srinivasa Matthew Fickus Manuel N. Gonzalez-Rivero Sarah Yichia Hsieh Yusong Guo Adam D. Linstedt Jelena Kovacevic Department of Biomedical Engineering Center for Bioimage Informatics Department of Mathematics and Statistics Air Force Institute of Technology USA Dept. of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh U.S.A. Dept. of Biomedical Engineering and Center for Bioimage Informatics Carnegie Mellon University Pittsburgh U.S.A. Department of Biological Sciences Carnegie Mellon University Pittsburgh USA

We present a novel active mask framework for the segmentation of fluorescence microscope images of cells, and in particular, for the segmentation of the Golgi body as well as cell- volume computation. We demonstrate that the algorithm is able to efficiently segment a stack of images and successfully assign multiple pieces of the Golgi body in a 2D image to the cell to which they belong. Further, we demonstrate that our algorithm is more accurate than manual segmentation of these images.

关键词： Image segmentation Active contours Level set Fluorescence Microscopy Topology Cells (biology) Proteins Testing Convergence

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Algorithms to Managing Unicast, Multicast and Broadcast Transmission for Optical Switches

Algorithms to Managing Unicast, Multicast and Broadcast Tran...

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The 11th Asia-Pacific Network Operations and Management Symposium

作者： Dawid Zydek Leszek Koszalka Iwona Pozniak-Koszalka Keith J. Burnham Dept. of Electrical and Computer Engineering University of NevadaLas VegasUSA Chair of Systems and Computer Networks Wroclaw University of Technology50-370 WroclawPoland Control Theory and Applications Centre Coventry UniversityCV1 5FB CoventryUnited Kingdom

This paper deals with an optical switching problem concerning an architecture represented by input-output request matrix. New algorithms such as LS, Q-family and J-family are presented and thoroughly studied. J-family algorithms are some modifications of the well known Double algorithm. The study focuses on comparison between the considered algorithms and known algorithms such as Double and Exact. The local comparison criteria consist of the number of decomposed matrices, the number of empty slots, the total time of decomposition and excess. As the global index of performance the weighted penalty is introduced, which comprises local criteria. The properties of the proposed algorithms are shown on examples, where matrices with various elements are decomposed into permutation matrices (switch configurations). An idea of experimentation system and some results of investigations are presented. The properties of the considered algorithms are discussed, especially significant results for LS algorithm are described.

关键词： network transmission, algorithm, experimentation system

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Modeling human cognition using a transformational knowledge architecture

2008 IEEE International Conference on System of Systems Engi...

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2008 IEEE International Conference on System of systems engineering, SoSE 2008 2008年

作者： Rubin, Stuart H. Lee, Gordon Pedrycz, Witold Spawar, Shu-Ching Chen Systems Center 53560 Hull Street San Diego CA 92152 United States Dept. of Electrical and Computer Engineering San Diego State University 5500 Campanile Drive San Diego CA 92182 United States Dept of Electrical and Computer Engineering University of Alberta Edmonton AB T6G 2R3 Canada School of Computing and Information Sciences Florida Int'l University 11200 SW 8th St ECS 362 Miami FL 33199 United States

ISBN: (纸本)9781424421732

While much research has been devoted to learning and machine intelligence, the field is still in its infancy. In particular, a technology that will allow for heuristic exploitation of information domain regularities to reduce the time required for knowledge acquisition while concomitantly resulting in an increase in the reliability of the acquired knowledge is still lacking. Unfortunately, contemporary learning mechanisms such as neural network architectures are inherently incapable of such performance. The objective of this paper is to present a new way of looking at learning and machine intelligence which has applicability in many fields such as in robotics, intelligent agents, data fusion, and cooperative sensing. In particular, we propose to construct a new architecture, that is, a transformational architecture for learning, intelligent fusion and transference of knowledge. A System of systems (SoS) approach is used to realize machine intelligence. Random differences are learned by the system, generalized, and made available for subsequent replay in design transformations. Cross-domain symmetries can play a major role in design generation in particular and in the design of SoSs in general. The fundamental theory of randomization is the science, which underpins the practice. This strategy is employed in the design of the Knowledge Amplification by Structural Expert Randomization or KASER system. © 2008 IEEE.

关键词： Expert systems

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Phase coherent, injection-seeded table-top soft x-ray lasers at wavelengths down to 13.9 nm

Phase coherent, injection-seeded table-top soft x-ray lasers...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Y. Wang F. Pedaci M. Berrill B. Luther E. Granados D. Alessi J. J. Rocca National Science Foundation Center for Extreme Ultraviolet Science and Technology and Department of Electrical and Computer Engineering Colorado State University Fort Collins CO USA Department of Physics Colorado State University Fort Collins CO USA Dept. of Electr. & Comput. Eng. Nat. Sci. Found. Center for Extreme Ultraviolet Sci. & Technol. Fort Collins CO National Science Foundation Center for Extreme Ultraviolet Science and Technology and Department of Electrical and Computer Engineering USA

We have realized the first demonstration of soft X-ray lasers with essentially full spatial and temporal coherence at sub-20 nm wavelengths by high harmonic seeding of soft X-ray plasma amplifiers created by irradiati... 详细信息

ISBN: (纸本)9781557528599

关键词： X-ray lasers Pulse amplifiers Free electron lasers Solid lasers Laser beams Spatial coherence Optical amplifiers Optical pulses Plasma waves Plasma x-ray sources

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Digital speed control of multi-inertia resonant system using real time simulator

Digital speed control of multi-inertia resonant system using...

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International Conference on electrical Machines and systems

作者： Ikeda, Hidehiro Hanamoto, Tsuyoshi Tsuji, Teruo Dept. of Electrical Electronics and Computer Engineering Nishi-Nippon Institute of Technology Japan Graduate School of Life Science and Systems Engineering Kyushu Institute of Technology Japan Dept. of Information and Systems Engineering Fukuoka Institute of Technology Japan

ISBN: (纸本)9788986510089

In this paper, a robust vibration suppression control method for a multi-inertia (a three-inertia and a four-inertia) system by a digital modified-IPD controller is proposed. The controller consists of integral, proportional, derivative and time lag of first order element. We apply the Taguchi Method for the determination of the controller gains for several noise factors (load side inertias and stiffness of the shafts). To confirm the effectiveness of the controller structure with several conditions and the tuning method, we use a real-time simulator based on a RTLinux.

关键词： 3-intertia system 4-inertia system digital modified-IPD (m-IPD) controller Taguchi Method real-time simulator

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Work in progress - How real is student engagement in using virtual laboratories

Work in progress - How real is student engagement in using v...

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37th ASEE/IEEE Frontiers in Education Conference, FIE

作者： Lindsay, Euan Koretsky, Milo Richardson, J.J. Mahalinga-Iyer, Mahalinga Dept. Mechanical Engineering Curtin University of Technology Dept. Chemical Engineering Oregon State University Dept. Electrical and Computer Engineering Technology Purdue Universtiy School of Engineering Systems Queensland University of Technology

ISBN: (纸本)1424410843

Laboratory classes are an integral part of engineering education, but they are resource intensive and can also impose significant logistical constraints upon the curriculum. One option to reduce these burdens is the use of virtual laboratories - where students do not interact with real hardware, but rather with computer simulations of laboratory equipment. A key issue in virtual laboratories is the issue of the authenticity of the learning experience. It is imperative that the students interact with these laboratories in a way that is reflective of the hardware being simulated. However, there is the potential for students to lose sight of the underlying hardware, and instead get caught up in the "computer game-ness" of the experience. The degree to which students are engaged in the type of cognitive processes used by practicing engineers is critical to how they construct their learning within the virtual laboratory, and as such can dramatically impact the overall learning outcomes of the class. This WIP paper presents a multi-site study investigation into these outcomes involving four different virtual laboratories at four different universities. © 2007 IEEE.

关键词： Students

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A reliable skin mole localization scheme

A reliable skin mole localization scheme

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2007 IEEE 11th International Conference on computer Vision, ICCV

作者： Taeg, Sang Cho Freeman, William T. Tsao, Hensin CSAIL Dept. of Electrical Engineering and Computer Science Massachusetts Institute of Technology Dept. of Dermatology Harvard Medical School Wellman Center for Photomedicine

Mole pattern changes are important cues in detecting melanoma at an early stage. As a first step to automatically register mole pattern changes from skin images, this paper presents a framework to detect and label moles on skin images in the presence of clutter, occlusions, and varying imaging conditions. The input image is processed with cascaded blocks to successively discard non-mole pixels. Our method first searches the entire input image for skin regions using a non-parametric skin detection scheme, and the detected skin regions are further processed using a difference of Gaussian (DoG) filter to find possible mole candidates of varying sizes. Mole candidates are classified as moles in the final stage using a trained support vector machine. To increase the mole classification accuracy, hair is removed if present on the skin image using steerable filters and a graphical model. The performance of the designed system is evaluated with 28 test images, and the experimental results demonstrate the effectiveness of the proposed mole localization scheme. ©2007 IEEE.

关键词： computer vision

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