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IEEE International Conference on Automation science and engineering (CASE)

作者： Jiangzhao Yang Dongjun Zhang Zexiang Li Division of Control and Mechatronics Harbin Institute of Technology Shenzhen Graduate School Shenzhen China Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Kowloon Hong Kong China

Accurate modeling and identification to the dynamics of the feed drive system is significant in designing a high performance milling machine. In this paper, mathematical model of the feed drive system, including electromagnetic and mechanical aspects, is concluded. To be consistent with the controller design techniques, two different grey-box identification methods are discussed to estimate the model of a practical milling machine. It turns out that the sampled-data control system with a slower sample rate fits the system better than the faster one. Moreover, compared with the model estimated by partial continuous approach, the total discrete-time model achieves better results in the model validation.

关键词： Metalworking machines Feeds Servomechanisms Mathematical model Control systems Machining Servomotors Robust control Friction Power system modeling

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Intelligent management of distributed dynamic sensor networks

Intelligent management of distributed dynamic sensor network...

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作者： Sapaty, Peter Sugisaka, Masanori Delgado-Frias, Jose Filipe, Joaquim Mirenkov, Nikolay Institute of Mathematical Machines and Systems National Academy of Sciences Glushkova Ave 42 03187 Kiev Ukraine Department of Electrical and Electronic Engineering Oita University 700 Oaza Dannoharu 870-1192 Japan School of Electrical Engineering and Computer Science Washington State University Pullman WA 99164-2752 United States Departamento Sistemas e Informática Escola Superior de Tecnologia de Setúbal 2910-761 Setúbal Portugal University of Aizu Aizu-Wakamatsu Fukushima-ken 965-8580 Japan

ISBN: (纸本)9784990288013

A universal solution for management of dynamic sensor networks will be presented, covering both networking and application layers. A network of intelligent modules, overlaying the sensor network, collectively interprets mission scenarios in a special high-level language, which can start from any nodes and cover the network at runtime. The spreading scenarios are extremely compact, which may be useful for energy saving communications. The code will be exhibited for distributed collection and fusion of sensor data, also for tracking mobile targets by scattered and communicating sensors. ©ISAROB 2007.

关键词： Network layers

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A Generalized disturbance filter design and its applications to a spinstand servo system with microactuator

A Generalized disturbance filter design and its applications...

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9th International Conference on Control, Automation, Robotics and Vision, 2006, ICARCV '06

作者： Zheng, Jinchuan Guo, Xiao Wang, Youyi Fu, Minyue School of Electrical Engineering and Computer Science University of Newcastle Callaghan NSW 2308 Australia Data Storage Institute Singapore 117608 Singapore School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798 Singapore

ISBN: (纸本)1424403421

Narrow-band position error at mid-frequencies around the open-loop crossover frequency can not be effectively reduced using a conventional peak filter, because the attenuation of sensitivity gains has to compromise with the associated decrease of phase margin. This paper presents a general second-order filter that is applicable to reject narrow-band disturbances at any frequency range. The filter zero is designed to minimally degrade the closed-loop system stability and obtain a smooth sensitivity curve around the disturbance frequency. A nonlinear optimization procedure is developed to select the filter parameters such that the statistical position error is minimized. Experimental results of a PZT-actuated head positioning control system on spinstand demonstrate that the add-on filter can further reduce the mid-frequency PES NRRO by 8% and preserve the stability margin of the original control system. © 2006 IEEE.

关键词： Servomechanisms

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Efficiently clustering transactional data with weighted coverage density 06

Efficiently clustering transactional data with weighted cove...

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15th ACM Conference on Information and Knowledge Management, CIKM 2006

作者： Yan, Hua Chen, Keke Liu, Ling Computational Intelligence Laboratory School of Computer Science and Engineering University of Electronic Science and Tech. of China Chengdu 610054 China College of Computing Georgia Institute of Technology Atlanta GA 30280 United States

ISBN: (纸本)1595934332

It is widely recognized that developing efficient and fully automated algorithms for clustering large transactional datasets is a challenging problem. In this paper, we propose a fast, memory-efficient, and scalable clustering algorithm for analyzing transactional data. Our approach has three unique features. First, we use the concept of Weighted Coverage Density as a categorical similarity measure for efficient clustering of transactional datasets. The concept of weighted coverage density is intuitive and allows the weight of each item in a cluster to be changed dynamically according to the occurrences of items. Second, we develop two transactional data clustering specific evaluation metrics based on the concept of large transactional items and the coverage density respectively. Third, we implement the weighted coverage density clustering algorithm and the two clustering validation metrics using a fully automated transactional clustering framework, called SCALE (Sampling, Clustering structure Assessment, cLustering and domain-specific Evaluation). The SCALE framework is designed to combine the weighted coverage density measure for clustering over a sample dataset with self-configuring methods that can automatically tune the two important parameters of the clustering algorithms: (1) the candidates of the best number K of clusters;and (2) the application of two domain-specific cluster validity measures to find the best result from the set of clustering results. We have conducted experimental evaluation using both synthetic and real datasets and our results show that the weighted coverage density approach powered by the SCALE framework can efficiently generate high quality clustering results in a fully automated manner. Copyright 2006 ACM.

关键词： Clustering algorithms

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A Generalized Disturbance Filter Design and its Applications to a Spinstand Servo System with Microactuator

A Generalized Disturbance Filter Design and its Applications...

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International Conference on Control, Automation, Robotics and Vision (ICARCV)

作者： Jinchuan Zheng Guoxiao Guo Youyi Wang Minyue Fu School of Electrical Engineering and Computer Science University of Newcastle NSW Australia Data Storage Institute Singapore School of Electrical & Electronic Engineering Nanyang Technological University Singapore

关键词： Filters Servomechanisms Microactuators Narrowband Frequency Stability Control systems Degradation Rail to rail outputs Open loop systems

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Development of a GMPLS-capable WDM optical network testbed and distributed storage application

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IEEE Communications Magazine 2006年第2期44卷 23-29页

作者： Zhou, Luying Chai, Teck Yoong Saradhi, Chava Vijaya Wang, Yixin Foo, Victor Qiang, Qiu Biswas, Jit Lu, Chao Gurusamy, Mohan Cheng, Tee Hiang Wang, Yonghong Institute for Infocomm Research Agency for Science Technology and Research Singapore Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore Singapore Communication Engineering Division School of Electrical and Electronic Engineering Nanyang Technological University Singapore Singapore Data Storage Institute Agency for Science Technology and Research Singapore Singapore

In this article we present the details of a generalized multiprotocols label witching controlled wavelength-division multiplexing (WDM) optical network developed under the Optical Network Focused Interest Group (ONFIG) program in Singapore. The WDM network is controlled through a GMPLS control plane that consists of CR-LDP, LMP, and OSPF-TE. We conducted various field trials on the GMPLS-capable WDM optical network testbed with the main focus on distributed storage service application. We developed and evaluated a distributed storage services application on the WDM optical network testbed and demonstrated that incorporating a lightweight data transport protocol with optical network control could be an efficient approach for data-intensive storage applications by exploiting the dynamic connection establishment and backup protection features. © 2006 IEEE.

关键词： Telecommunication networks

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A Cellular Active Contours Algorithm Based on Region Evolution

A Cellular Active Contours Algorithm Based on Region Evoluti...

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IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： Piotr Dudek David Lopez Vilarino School of Electrical and Electronic Engineering University of Manchester Institute of Science and Technology UK Department of Electronics and Computer Science University of Santiago de Compostela Spain

This paper introduces a new algorithm for implementing cellular active contour technique based on pixel-level snakes (PLS). The main motivation is the optimization of the computational performance, especially when PLS are implemented on pixel-parallel single instruction multiple data (SIMD) processor arrays. The algorithm is based on the evolution of an active region. This allows the implementation of the entire algorithm using every simple local rules. Additionally, nested contours and propagation into narrow cavities are supported. The algorithm and experimental results from real-time implementation on vision chips are presented

关键词： Active contours Iterative algorithms Application software Concurrent computing electronic mail computer vision Shape control Image processing Cellular neural networks Cellular networks

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A Fast Halftoning Algorithm using LUT Approach for Grey-level Images

A Fast Halftoning Algorithm using LUT Approach for Grey-leve...

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International Conference on Information and Communication Technologies: From Theory to Applications, ICTTA

作者： N. Atamna Z. Tifedjadjine Z. Dibi A. Bouridane Institute of Electronic Engineering University of Batna Algeria School of Computer Science Queen''s University Belfast Belfast UK

The process of halftoning is usually computationally expensive and algorithms that speed up this process are often desired. This proposes a novel technique in an attempt to improve the speed of the algorithm initially proposed by Murat's and Vaidaynatan. In addition our propose technique is extended to operate on grey-level images halftoning using look up table technique. The results obtained have been assessed and have clearly shown that our proposed algorithm performs favourably in terms of speed

关键词： Table lookup Pixel Algorithm design and analysis Image converters Printers Image reconstruction Image coding data structures

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Ensemble LDA for face recognition

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International Conference on Biometrics, ICB 2006

作者： Kong, Hui Li, Xuchun Wang, Jian-Gang Kambhamettu, Chandra School of Electrical and Electronic Engineering Nanyang Technological University 50 Nanyang Ave. 639798 Singapore Institute for Infocomm Research 21 Heng Mui Keng Terrace 119613 Singapore Department of Computer and Information Science University of Delaware Newark DE 19716-2712

ISBN: (纸本)3540311114

Linear Discriminant Analysis (LDA) is a popular feature extraction technique for face image recognition and retrieval. However, It often suffers from the small sample size problem when dealing with the high dimensional face data. Two-step LDA (PCA+LDA) [1,2,3] is a class of conventional approaches to address this problem. But in many cases, these LDA classifiers are overfitted to the training set and discard some useful discriminative information. In this paper, by analyzing the overfitting problem for the two-step LDA approach, a framework of Ensemble Linear Discriminant Analysis (EnLDA) is proposed for face recognition with small number of training samples, In E nLDA, a Boosting-LDA (B-LDA) and a Random Sub-feature LDA (RS-LDA) schemes are incorporated together to construct the total weak-LDA classifier ensemble. By combining these weak-LDA classifiers using majority voting method, recognition accuracy can be significantly improved. Extensive experiments on two public face databases verify the superiority of the proposed E nLDA over the state-of-the-art algorithms in recognition accuracy. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Face recognition

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A novel shrinkage technique based on the normal inverse Gaussian density model

A novel shrinkage technique based on the normal inverse Gaus...

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作者： Shang, Li Li, Kang Lok, Tat-Ming Lyu, Michael R. Hefei Institute of Intelligent Machines Chinese Academy of Sciences P.O. Box 1130 Hefei Anhui 230031 China Automation Department University of Science and Technology of China Hefei Anhui 230026 China School of Electrical and Electronic Engineering Queen's University Belfast United Kingdom Information Engineering Department Chinese University of Hong Kong Shatin Hong Kong Computer Science and Engineering Department Chinese University of Hong Kong Shatin Hong Kong

This paper proposes a novel image denoising technique based on the normal inverse Gaussian (NIG) density model using an extended non-negative sparse coding (NNSC) algorithm proposed by us. This algorithm can converge to feature basis vectors, which behave in the locality and orientation in spatial and frequency domain. Here, we demonstrate that the NIG density provides a very good fitness to the non-negative sparse data. In the denoising process, by exploiting a NIG-based maximum a posteriori estimator (MAP) of an image corrupted by additive Gaussian noise, the noise can be reduced successfully. This shrinkage technique, also referred to as the NNSC shrinkage technique, is self-adaptive to the statistical properties of image data. This denoising method is evaluated by values of the normalized signal to noise rate (SNR). Experimental results show that the NNSC shrinkage approach is indeed efficient and effective in denoising. Otherwise, we also compare the effectiveness of the NNSC shrinkage method with methods of standard sparse coding shrinkage, wavelet-based shrinkage and the Wiener filter. The simulation results show that our method outperforms the three kinds of denoising approaches mentioned above. © 2006 The institute of Measurement and Control.

关键词： Image processing

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