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MOEMS and Miniaturized Systems IX

作者： Lukes, Sarah J. Lämmle, David Dickensheets, David L. Dept. of Electrical and Computer Engineering Montana State University Bozeman MT 59717 United States Inst. for Microsystems Technology University of Freiburg Freiburg Germany

ISBN: (纸本)9780819479907

We have built 1 mm circular and 1 mm × 1.4 mm elliptical surface micro-machined SU-8 2002 deformable mirrors for focus control. The SU-8 2002 membrane layers are 2.25 μm thick with gold as the reflective coating on their surfaces. Three annular electrodes were used for electrostatic actuation. Stable deflection was observed up to 6.8 μm for a 1 mm × 1.4 mm elliptical mirror with an air gap of 14 μm. The frequency response of the membrane exhibited a 3 dB frequency larger than 10 kHz. © 2010 Copyright SPIE - The International Society for Optical engineering.

关键词： Reflective coatings

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FlashCam: A camera concept and design for the Cherenkov Telescope Array CTA

FlashCam: A camera concept and design for the Cherenkov Tele...

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32nd International Cosmic Ray Conference, ICRC 2011

作者： Pühlhofer, G. Bauer, C. Biland, A. Florin, D. Föhr, C. Gadola, A. Gredig, R. Hermann, G. Hinton, J. Huber, B. Kalkuhl, C. Kasperek, J. Kendziorra, E. Kihm, T. Koziol, J. Manalaysay, A. Rajda, P.J. Schanz, T. Steiner, S. Straumann, U. Tenzer, C. Vogler, P. Vollhardt, A. Weitzel, Q. White, R. Zietara, K. Max-Planck-Institut für Kernphysik P.O. Box 103980 D 69029 Heidelberg Germany ETH Zürich Inst. for Particle Physics Schafmattstr. 20 CH-8093 Zürich Switzerland Physik-Institut Universität Zürich Winterthurerstrasse 190 8057 Zürich Switzerland Dept. of Physics and Astronomy University of Leicester Leicester LE1 7RH United Kingdom Institut für Astronomie und Astrophysik Kepler Center for Astro and Particle Physics Eberhard-Karls-Universität Sand 1 D 72076 Tübingen Germany Faculty of Electrical Engineering Automatics Computer Science and Electronics AGH University of Science and Technology Al. Mickiewicza 30 30-059 Cracow Poland Jagiellonian University ul. Orla 171 30-244 Cracow Poland

The future Cherenkov Telescope Array (CTA) will consist of several tens of telescopes of different mirror areas. CTA will provide next generation sensitivity to very high energy photons over a wide energy range from few tens of GeV to >100 TeV. The signals of the photon detectors in the focal plane will be read out with custom-designed, fast digitization and triggering electronics. Within CTA, several camera electronics options are being evaluated. The FlashCam approach is unique here since data processing inside the camera is fully digital. Signal digitization and trigger processing are jointly performed in one single readout chain per detector pixel. For a group of pixels, such a chain consists of Flash ADCs and a Field-Programmable Gate Array (FPGA) module, both commercially available and reasonably priced. A camera-wide event trigger is subsequently computed in separate trigger units. The camera data is transferred from the cameras over ethernet to a central computer farm using a custom network protocol. Such a fully digital approach using state-of-the-art components provides accurate triggering and an easily scalable architecture in a cost-effective way. The FlashCam team is also evaluating the concept of a horizontal camera integration. Here, the photon detector plane is sustained by a monolithic carrier holding photon detectors, high voltage supplies, and preamplifiers only. The signal digitization and triggering electronics are organized in boards and crates which are kept at the rear side of the camera body. Such an approach allows different photon detectors to be adopted and might result in cost saving.

关键词： Cameras

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Tensor Product Model Transformation Based Friction Compensation of a Mechatronic System

Tensor Product Model Transformation Based Friction Compensat...

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International Conference on Intelligence engineering Systems

作者： Bela Takarics Peter Korondi Peter Baranyi Dept. of Mechatronics Optics and Engineering Informatics Budapest University of Technology and Economics Cognitive Informatics Research Group Computer and Automation Research Institute

ISBN: (纸本)9781424476527

The Tensor Product (TP) model transformation is a recently proposed technique for transforming given Linear Parameter-Varying (LPV) state-space models into polytopic model form, namely, to parameter-varying convex combination of Linear Time Invariant (LTI) systems. The main advantage of the TP model transformation is that it is executable in a straightforward way and the Linear Matrix Inequality (LMI) based control design frameworks can immediately be applied to the resulting polytopic models to yield controllers with tractable and guaranteed performance. The main contribution of this paper is that it represents the friction of a DC servo drive in TP model form, automatically designs LMI based controller for friction compensation. The reference signal compensation is also based on the TP model transformation. The results were simulated for speed control of the DC servo drive and were compared to other control techniques.

关键词： Non-linear system control Friction compensation DC servo drive Simulation

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A triple-random ensemble classification method for mining multi-label data

A triple-random ensemble classification method for mining mu...

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10th IEEE International Conference on Data Mining Workshops, ICDMW 2010

作者： Nasierding, Gulisong Kouzani, Abbas Z. Tsoumakas, Grigorios Dept. of Computer Science and Technology Xinjiang Normal University 102 Xin Yi Rd. Urumqi China School of Engineering Deakin University Geelong VIC 3217 Australia Department of Informatics Aristotle University of Thessaloniki Thessaloniki 54124 Greece

ISBN: (纸本)9780769542577

This paper presents a triple-random ensemble learning method for handling multi-label classification problems. The proposed method integrates and develops the concepts of random subspace, bagging and random k-labelsets ensemble learning methods to form an approach to classify multi-label data. It applies the random subspace method to feature space, label space as well as instance space. The devised subsets selection procedure is executed iteratively. Each multi-label classifier is trained using the randomly selected subsets. At the end of the iteration, optimal parameters are selected and the ensemble MLC classifiers are constructed. The proposed method is implemented and its performance compared against that of popular multi-label classification methods. The experimental results reveal that the proposed method outperforms the examined counterparts in most occasions when tested on six small to larger multi-label datasets from different domains. This demonstrates that the developed method possesses general applicability for various multi-label classification problems. © 2010 IEEE.

关键词： Learning systems

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Convex hull manipulation based control performance optimisation

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WSEAS Transactions on Systems and Control 2010年第8期5卷 691-700页

作者： Gróf, Patrícia Baranyi, Péter Korondi, Péter Computer and Automation Research Institute Cognitive Informatics Research Budapest Hungary Budapest University of Technology and Economics Dept. of Telecommunications and Media Informatics Budapest Hungary Budapest University of Technology and Economics Dept. of Mechatronics Optics and Engineering Informatics Budapest Hungary

This paper deals with the topic of qLPV state-space model based control design in which LMIs are used to optimize the multi-objective control performance. In this paper we investigate how the manipulation convex hull of the polytopic model influences the control performance which is derived by LMIs. We examine these influences through the control design of the two dimensional aeroelastic system's example. First we define various TP type polytopic model representations of a wing section whose vertices define different convex hulls. In the second step we investigate how these models lead to different control performances.

关键词： State space methods

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Determination of the Stability Parameter Space of a Two Dimensional Aeroelastic System, a TP Model-based Approach

Determination of the Stability Parameter Space of a Two Dime...

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International Conference on Intelligence engineering Systems

作者： Patricia Grof Peter Baranyi Peter Korondi "Computer and Automation Research Institute/Cognitive Informatics Research Group Budapest University of Technology and Economics/Dept. of Telecommunications and Media Informatics Budapest University of Technology and Economics/Dept. of Mechatronics Optics and Engineering Informatics

ISBN: (纸本)9781424476527

This paper falls in the topic of qLPV state-space model based control design in which LMIs are used to optimize the multi-objective control performance. In this paper we investigate how the convex hull of the polytopic model influences the feasibility of the LMI based control design and the resulting control performances. We examine these influences through the control design of the two dimensional aeroelastic system's example. First we define various TP type polytopic model representations of a wing section whose vertices define different convex hulls. In the second step we investigate how these models lead to different control performances.

关键词： Stability Control systems Nonlinear control systems Delay effects Space technology Control design Feedback control Displacement control Force control Velocity control

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Using bi-clustering algorithm for analyzing online users activity in a virtual campus

Using bi-clustering algorithm for analyzing online users act...

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2nd International Conference on Intelligent Networking and Collaborative Systems, INCOS 2010

作者： Xhafa, Fatos Caballé, Santi Barolli, Leonard Molina, Alberto Miho, Rozeta Dept. of Languages and Informatics Systems Technical University of Catalonia Spain Dept. of Computer Sci. Multimedia and Telecommunication Open University of Catalonia Spain Dept. of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan Faculty of Information Technologies Technical University of Tirana Albania

ISBN: (纸本)9780769542782

Data mining algorithms have been proved to be useful for the processing of large data sets in order to extract relevant information and knowledge. Such algorithms are also important for analyzing data collected from the users' activity users. One family of such data analysis is that of mining of log files of online applications that register the actions of online users during long periods of time. A relevant objective in this case is to study the behavior of online users and feedback the design processes of online applications to provide better usability and adaption to users' preferences. The context of this work is that of a virtual campus in which thousands of students and tutors carry out the learning and teaching activity using online applications. The information stored in log files of virtual campuses tend to be large, complex and heterogeneous in nature. Hence, their mining requires both efficient and intelligent processing and analysis of user interaction data during long-term learning activities. In this paper, we present a bi-clustering algorithm for processing large log data sets from the online daily activity of students in a real virtual campus. Our approach is useful to extract relevant knowledge about user activity such as navigation patterns, activities performed as well as to study time parameters related to such activities. The extracted information can be useful not only to students and tutors to stimulate and improve their experience when interacting with the system but also to the designers and developers of the virtual campus in order to better support the online teaching and learning. © 2010 IEEE.

关键词： Clustering algorithms

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Performance evaluation of various storage formats for clinical data repositories

Performance evaluation of various storage formats for clinic...

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2010 IEEE International Workshop on Medical Measurements and Applications, MeMeA 2010

作者： Gilchrist, Jeff Frize, Monique Ennett, Colleen M. Bariciak, Erika Dept. Systems and Computer Engineering Carleton University Ottawa ON Canada School of Information Technology and Engineering University of Ottawa Ottawa ON Canada Dept. Biomedical Informatics Philips Research North America Briarcliff Manor NY United States Faculty of Medicine University of Ottawa Children's Hospital of Eastern Ontario Ottawa ON Canada

ISBN: (纸本)9781424462896

The performance of three different Entity-Attribute-Value (EAV) storage formats for Clinical Data Repositories (CDRs) is compared with regards to querying millions of data points from clinical sources to assess the amount of storage space the data use, the speed with which the data can be obtained, and the complexity of the queries required to retrieve the data. Performance results are presented that show that the hybrid EAV approach provides a nice balance of the simple and multi-data type formats. ©2010 IEEE.

关键词： Decision support systems

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Discrete-time modeling tools for DC-DC converters

Discrete-time modeling tools for DC-DC converters

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2010 International Power Electronics Conference - ECCE Asia -, IPEC 2010

作者： Hamar, J. Nagy, I. Funato, H. Nishida, Y. Ohsaki, H. Masada, E. Department of Automation and Applied Informatics Budapest University of Technology and Economics Goldmann Gyorgy Ter 3 1111 Budapest Hungary MFKK Invention and Research Center Services Co. Ltd. Budapest Hungary Computer and Automation Research Institute Hungarian Academy of Science Budapest Hungary Dept. of Electrical and Electronic Engineering Utsunomiya University Utsunomiya Japan Dept. of Electric Electronics and Computer Engineering Chiba Institute of Technology Japan University of Tokyo Tokyo Japan Railway Technology Research Institute Tokyo Japan

ISBN: (纸本)9781424453955

The objective of the discrete-time modeling tools is twofold. First, they give an insight into the basic ideas of discrete-time modeling of dc-dc converters for university students and interested power electronics specialists. Second, as it is being presented below, the interactive calculation tools facilitate the fast and simple model-development in WEB browser after entering the basic circuit and load parameters. This feature can especially be useful for the practicing design engineers, since without long calculations with matrix functions the linearized discrete-time system model is immediately and automatically developed in both mathematical form (state-space equations and transfer functions in the Z domain) and also in graphical form (pole-zero map and bode plot). © 2010 IEEE.

关键词： DC-DC converters

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Algorithm for automatic 3-D scanned bullet identification based on the principle of human vision

Algorithm for automatic 3-D scanned bullet identification ba...

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2010 International Conference on Applied Mechanics and Mechanical engineering, ICAMME 2010

作者： Jing, Lu Shihong, Wu Yuda, Shi College of Optoelectronic Science and Engineering Huazhong Univ. of Science and Technology 430074 Wuhan China Dept. of Computer Science and Technology Hubei Univ. of Education 430205 Wuhan China Inst. of Pattern Recognition and Artificial Intelligence Huazhong Uni. of Science and Technology 430074 Wuhan China

ISBN: (纸本)9780878492459

Bullet identification is a complicated work which demands high accuracy rate. In this paper, we try to find a reliable and fast automatic bullet identification algorithm using image processing technology. The key and most difficult step is to find an image feature which can describe the unique striation pattern on the bullet. When we do bullet identification by human-eye, we try to best match the striations of the bullets. It's mainly according to the order of the striations and the distance between them. Based on this principle, a new algorithm for automatic bullet identification is proposed. Using the bullet's visual graphic set which is offered by the Three-Dimensional Laser Color Scanner (3DLCS), we firstly do pre-processing to the bullet unwrapped image, such as image enhancement, edge detecting, binarization, thinning and denoising, to obtain an image with clear striations and low noises. Then we find an effective image feature based on the principle of human vision: the bullet feature vectors (BFVs). According to actual needs, we give a reasonable definition for vector distance (VD) between vectors of different dimensions, and take VD of BFVs as a measurement for bullet similarity. Experimental results prove that our algorithm can correctly find the bullets with high trace similarity and do bullet identification successfully. © (2010) Trans Tech Publications, Switzerland.

关键词： Feature extraction

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