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2010 49th IEEE Conference on Decision and Control

作者： Angelo Alessandri Marco Baglietto Giorgio Battistelli Victor Zavala Department of Production Engineering Thermoenergetics and Mathematical Models DIPTEM-University of Genoa P.le Kennedy Pad. D 16129 Genova Italy Department of Communications Computer and System Sciences DIST-University of Genoa Via Opera Pia 13 16145 Genova Italy Dipartimento di Sistemi e Informatica Universita degli Studi di Firenze Via di S. Marta 3 50139 Firenze Italy Mathematics and Computer Science Division Argonne National Laboratory 9700 South Cass Ave Bldg. 221 Argonne IL 60439 USA

ISBN: (纸本)9781424477456

In the last decade, moving horizon estimation (MHE) has emerged as a powerful technique for tackling the problem of estimating the state of a dynamic system in the presence of nonlinearities and disturbances. MHE is based on the idea of minimizing an estimation cost function defined on a sliding window composed of a finite number of time stages. The cost function is usually made up of two contributions: a prediction error computed on a recent batch of inputs and outputs;an arrival cost that serves the purpose of summarizing the past data. However, the diffusion of such techniques has been hampered by: i) the difficulty in choosing the arrival cost so as to ensure stability of the overall estimation scheme;ii) the request of an adequate computational effort on line. In this paper, both problems are addressed and possible solutions are proposed. First, by means of a novel stability analysis, it is constructively shown that under very general observability conditions a quadratic arrival cost is sufficient to ensure the stability of the estimation error provided that the weight matrix is adequately chosen. Second, a novel approximate MHE algorithm is proposed that is based on nonlinear programming sensitivity calculations. The approximate MHE algorithm has the same stability properties of the optimal one which make the overall approach suitable to be applied in real settings. Preliminary simulation results confirm the effectiveness of proposed method.

关键词： Cost functions Horizon sliding windows Moving Dynamic systems Error of prediction

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Theoretical mean-variance relationship of IP network traffic based on ON/OFF model

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science in China(Series F) 2009年第4期52卷 645-655页

作者： JIN Yi ZHOU Gang JIANG DongChen YUAN Shuai WANG LiLi CAO JianTing State Key Laboratory of Software Development Environment Beihang University Beijing 100191 China School of Computer Science & Engineering Beihang University Beijing 100191 China National Digital Switching System Engineering & Technological Research Center Zhengzhou 450002 China

Mean-variance relationship （MVR）, nowadays agreed in power law form, is an important function. It is currently used by traffic matrix estimation as a basic statistical assumption. Because all the existing papers obtain MVR only through empirical ways, they cannot provide theoretical support to power law MVR or the definition of its power exponent. Furthermore, because of the lack of theoretical model, all traffic matrix estimation methods based on MVR have not been theoretically supported yet. By observing both our laboratory and campus network for more than one year, we find that such an empirical MVR is not sufficient to describe actual network traffic. In this paper, we derive a theoretical MVR from ON/OFF model. Then we prove that current empirical power law MVR is generally reasonable by the fact that it is an approximate form of theoretical MVR under specific precondition, which can theoretically support those traffic matrix estimation algorithms of using MVR. Through verifying our MVR by actual observation and public DECPKT traces, we verify that our theoretical MVR is valid and more capable of describing actual network traffic than power law MVR.

关键词： traffic matrix mean-variance relationship self-similar

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Gait identification using cumulants of accelerometer data

Gait identification using cumulants of accelerometer data

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作者： Sprager, Sebastijan Zazula, Damjan System Software Laboratory University of Maribor Faculty of Electrical Engineering and Computer Science Smetanova ulica 17 2000 Maribor Slovenia

ISBN: (纸本)9789604741359

This paper describes gait identification using cumulants of accelerometer data. Accelerometer data of three different walking speeds for each subject (normal, slow and fast) was acquired by a cell phone placed on the person's hip. Data analysis was based on gait cycles that were detected first. Cumulants of order from 1 to 4 with lags from 0 to 10 for second, third and fourth order cumulants were calculated from the cycles and used as feature vectors for classification which was accomplished by support vector machines (SVM). Six healthy young subjects participated in the experiment. According to their gait classification the average recognition rate was 93.1%. A similarity measure for discerning different walking types of the same subject was also introduced using principal component analysis (PCA).

关键词： Accelerometers

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A novel method to implement an interactive mobile robot

A novel method to implement an interactive mobile robot

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IEEE International Conference on Advanced Robotics and its Social Impacts

作者： Lee, Wen-Yo Guo, Jhu-Syuan Pao, Chan-An Hung, Ta-Chih Computer Information and Network Engineering Lunghwa University of Science and Technology Taoyuan Taiwan Mechanical and System Research Laboratory Industrial Technology Research Institute Hsinchu Taiwan

ISBN: (纸本)9781424443949

This paper presents a novel method to implement an interactive mobile robot. The proposed mobile robot is implemented under the technique of mixed reality. The mixed reality technique is realized by both the Virtools tool and mobile robot. There are three basic interactive behaviors of human beings have been implemented on this proposed mobile robot. There are target navigation behavior, face tracking behavior, and obstacle avoidance behavior;the three behaviors are designed by the fuzzy rules method, respectively. These behaviors lead to the proposed path planning strategy possibly. On the other hand, a novel path planning strategy for a mobile robot is given in this paper. The path planning strategy is according to the experience that the mobile robot has been experienced in target navigation. Experiments show that the proposed behaviors are well designed. With the basic ability of the behaviors, the proposed robot can automatically learn from the previous navigation experience and can optimize the path planning. © 2009 IEEE.

关键词： Mobile robots

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The organic plastic photonic crystal for terahertz filter

The organic plastic photonic crystal for terahertz filter

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2009 International Conference on Optical Instruments and Technology, OIT 2009

作者： Liang, Binming Yao, Cuiya Di, Qianli Chen, Jiabi Zhuang, Songlin Shanghai Key Laboratory of Contemporary Optics System School of Optical - Electrical and Computer Engineering University of Shanghai for Science and Technology 516 Jungong Road 200093 Shanghai China

ISBN: (纸本)9780819478986

This paper is mainly concerned with the study of the PBG (Photonic Band Gap) in 2D photonic crystal which consists of a hexagonal lattice of circular dielectric rods with Polyethylene. The result indicates that its PBG is very narrow. According that, a narrow band filter has been obtained by choosing certain parameters of the photonic crystal. © 2009 SPIE.

关键词： Photonic band gap

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Ytterbium-doped mode-locked fiber laser at hundreds of kHz repetition rate

Ytterbium-doped mode-locked fiber laser at hundreds of kHz r...

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Conference on Lasers and Electro-Optics, CLEO 2009

作者： Zhou, Chun Chen, Lingling Cai, Yue Zhang, Meng Ren, Ling Li, Peng Zhang, Zhigang Institute of Quantum Electronics State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science University of Beijing Beijing 100871 China

A long ring-cavity, low repetition rate Yb-doped fiber laser was demonstrated. Pulses with repetition rate of about 381.3 kHz and single pulse energy above 300 nJ were obtained. © 2009 Optical Society of America.

ISBN: (纸本)9781557528698

关键词： Fiber lasers

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Novel system for automatic measuring diopter based on ARM circuit block

Novel system for automatic measuring diopter based on ARM ci...

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International Symposium on Photoelectronic Detection and Imaging 2009: Material and Device Technology for Sensors

作者： Xue, Feng Zhong, Lei Chen, Zhe Xue, Deng-Pan Li, Xiang-Ning School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai 200093 China Shanghai Key Laboratory of Modern Optical System Shanghai 200093 China

ISBN: (纸本)9780819476623

Traditional commercial instruments utilized in vision screening programs cannot satisfy the request for real-time diopter measurement by far, and their success is limited by some defectiveness such as computer-attached, clumsy volume, and low accuracy of parameters measured, etc. In addition, astigmatic eyes cannot be determined in many devices. This paper proposes a new design of diopter measurement system based on SAMSUNG's ARM9 circuit block. There are several contributions in the design. The new developed system has not only the function of automatically measuring diopter, but also the advantages of the low cost, and especially the simplicity and portability. Besides, by placing point sources in three directions, the instrument can determine astigmatic eyes at the same time. Most of the details are introduced as the integrated design of measuring system, interface circuit of embedded system and so on. Through a preliminary experiment, it is proved that the system keeps good feasibility and validity. The maximum deviation of measurement result is *** experimental results also demonstrate the system can provide the service needed for real-time applications. The instrument present here is expected to be widely applied in many fields such as the clinic and home healthcare. © 2009 SPIE.

关键词： Embedded systems

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A portable and efficient User Dispatching Mechanism for multicore systems

A portable and efficient User Dispatching Mechanism for mult...

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15th IEEE International Conference on Embedded and Real-Time Computing systems and Applications, RTCSA 2009

作者： Tu, Tang-Hsun Hsueh, Chih-Wen Chang, Rong-Guey Embedded System and Wireless Network Laboratory Graduate Institute of Networking and Multimedia National Taiwan University Taipei 106 Taiwan System Software Laboratory Graduate Institute of Computer Science and Information Engineering National Chung Cheng University Chia-Yi 621 Taiwan

ISBN: (纸本)9780769537870

In multicore environment, using multiple threads is a common useful approach to improve application performance. Nevertheless, even in many simple applications, the performance might degrade when the number of threads increases. Users usually impute this phenomenon to the overhead of creation or termination of threads. However, in our observation, the more significant effect is the dispatching of threads. We discuss the problems on using threads, and present a novel User Dispatching Mechanism (UDispatch) that provides controllability in user space to improve application performance. Since user threads cannot directly control system resources, a virtual device is adopted between user space and operating system for portability and efficiency instead of adding new system calls through kernel modification. We also experiment UDispatch through multi-threading multimedia applications. The results show that a skip-line application speeds up to 111.3% and 111.6% on a 4-core machine and an 8-core machine, respectively, and an optimized H.264/AVC decoder speeds up to 18.4% on a 4-core machine. © 2009 IEEE.

关键词： computer architecture

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Texture Synthesis with Prioritized Pixel Re-synthesis

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Journal of Information science and engineering 2009年第2期25卷 389-402页

作者：嚴崇仁李同益 Computer Graphics Group/Visual System Laboratory Department of Computer Science and Information Engineering National Cheng Kung University

In this paper, we propose a new patch-based texture synthesis method. The core of the proposed method consists of two main components: (1) a feature-weighted similarity measurement to search for the best match and (2) a dynamically prioritized-based pixel re-synthesis to reduce discontinuity at the boundary of adjacent patches. Examples and experimental comparisons with other previous methods are demonstrated to verify the usefulness of our proposed method. In addition, we enhance the proposed method with a view warping technique to better synthesize non-frontal-parallel textures (NFPTs) that can not be synthesized well by traditional texture synthesis methods.

关键词： patch-based texture synthesis, prioritized-based pixel re-synthesis, feature- weighted, best match, discontinuity, frontal-parallel (FP) and non-frontal-parallel (NFP), view-warping

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Rendering method for multi-attribute objects based on state transition optimization strategy

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Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of computer-Aided Design and computer Graphics 2009年第3期21卷 311-318页

作者： Chen, Zhiyu Liang, Xiaohui Yu, Zhuo State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing 100083 China

Efficient rendering of complex scenes has receive great attention in real-time computer graphics. Current researches are mostly concentrated on reducing the geometric complexity of the scene model such as reconstructing an LOD representation, performing visibility culling etc. However, the rendering process of complex scenes involves not only the geometric information of each object, but also multiple attributes, including lighting, material, texture, etc. The invocation of each attribute corresponds to a specific state in the rendering pipeline, frequent transfer between different states in the pipeline will introduce large amount of overhead, hence reducing the rendering efficiency. A rendering method accounting for efficient invocation of multiple attributes of objects based on state transition optimization strategies is presented. It estimates the cost for invoking each attribute of objects in the rendering pipeline and expresses the transitions between various render states as a weighted directed graph. Then the optimized sequence of state transition is obtained by optimization. Experimental results show that our proposed method can effectively reduce the overhead of state transition and improve the rendering efficiency of scenes containing large amounts of multi-attribute objects.

关键词： Efficiency

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