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An IP packet forwarding technique based on a new structure of lookup table

International Journal of Computers and Applications 2006年第2期28卷 112-121页

作者： Arafat Ali, H. El-Desouky, A.I. Ared, M.F. Computers and Systems Dept. Faculty of Engineering Mansoura University Mansoura Egypt Deptartment of Computer Science University of Connecticut Storrs United States University of Mansoura Faculty of Computer Science Computer and Control Department Mansoura University Computer Engineering and Systems Department Faculty of Engineering Mansoura University Mansoura Egypt

In computer networks nowadays, high-speed routers are compulsory to deliver the incoming packet to its destination. There are two parameters that exist in all lookup techniques that directly affect performance results: data structure size and number of lookup table accesses. With these remarks in mind, the specific goals of this paper are: (i) Design a data structure for storing an IP lookup table that enhances the lookup process, (ii) Produce an IP lookup algorithm that has a bounded worst-case number of accesses lower than contemporary techniques, and (iii) Improve updating and deletion operations that do not create a bottleneck to efficient forwarding. This paper investigates a suitable data structure of the routing table in order to minimize the total routing time. The investigated structure of the routing table is based on RapidBase technique. It contains all the information necessary to forward an IP data packet toward its destination. The properties of the created routing table facilitate searching for the best matching prefix quicker than when using the current routing table where packets do not have to be queued before lookup. Additionally, the proposed algorithm's effectiveness is deliberated via simulation. A comparative study with recently published algorithms shows that our proposed scheme has a great impact on shortening the route lookup and update operations. For more enhancements, combinations of the proposed algorithm with the most popular algorithms are also studied.

关键词： Computer networks

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Estimation of current density distributions from EEG/MEG data by maximizing sparseness of spatial difference

Estimation of current density distributions from EEG/MEG dat...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： W. Nakamura S. Koyama S. Kuriki Y. Inouye Laboratory for advanced brain signal processing Brain Science Institute RIKEN Japan Department of electronic and control systems engineering Interdisciplinary faculty of science and engineering Shimane university Japan Lab of electromagnetic sensing Research Institute for electronic science Hokkaido university Japan

Separation of EEG (electroencephalography) or MEG (magnetoencephalography) data into activations of small dipoles or current density distribution is an ill-posed problem in which the number of parameters to estimate is larger than the dimension of the data. Several constraints have been proposed and used to avoid this problem, such as minimization of the L1-norm of the current distribution or minimization of Laplacian of the distribution. In this paper, we propose another constraint that the current density distribution changes at only a small number of areas and these changes can be large. By numerical experiments, we show that the proposed method estimates current distribution well from both data generated by strongly localized current distributions and data generated by currents broadly distributed

关键词： Current density Neurons Electroencephalography Current distribution Data engineering Brain modeling Data analysis control systems systems engineering and theory Signal processing

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Estimation of angle parameters based on multifunctional approach

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IEEJ Transactions on Fundamentals and Materials 2006年第6期126卷 490-495页

作者： Quan, Wei Shida, Katsunori Department of Advanced Systems Control Engineering Graduate School of Science and Engineering Saga University 1 Honjo-machi Saga 840-8502 Saga University Saga University Japan Saga University Saga Japan

Multifunctional approach gives the properties of sensor not only multifunctional, but also a compact structure and sometimes can increase discriminative property of sensing objects. In this study, because of the advantages of multifunctional approach, based on it, a sensor for estimating direction, obliquity and torsion angle parameters which are always used to describe the movement of a widely existing structure with a conjunction between two parts, likes robot arm, human extremity and so on is proposed. In order to obtain the reconstructions of three angle parameters in a simple and precise way, a symmetrical structure with three alike sensing elements are designed. The angle parameters are converted to the length change of three iron lines move on the surface of a flexible tube. This length change is detected based on inductance principle. Measuring several measured points as a database, the reconstructions of direction, obliquity and torsion angle can be obtained. The results calculated by these reconstructions prove the feasibility of the sensor.

关键词： Sensors

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Condition monitoring of micro-drilling processes on glass by using machine vision

Condition monitoring of micro-drilling processes on glass by...

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21st Annual Meeting of the American Society for Precision engineering, ASPE 2006

作者： Kim, Hyun-Ho Chung, Siyon Kim, Seung-Chul Jee, Won-Ho Chung, Sung-Chong Department of Mechanical Design and Production Engineering Hybrid Systems Design and Control Laboratory Hanyang University SungdongGu Seoul 133-791 Korea Republic of Faculty of Science University of Western Ontario London Canada Shinhan Diamond Inc. Incheon 405-100 Korea Republic of

ISBN: (纸本)1887706410

Optical and medical devices require micro-drilling of holes on glass. Brittle fracture occurs during the drilling. Cone and radial cracks are generated due to impact load and walking when a drill hit a glass to make a hole. To produce good holes without cracks and fracture, a condition monitoring of glass drilling processes is required. In this paper, to develop a cost-effective direct monitoring system in micro-drilling processes on glass, a machine vision unit with the edge detection and 3D measurement functions is studied. It consists of a CCD camera with a zoom lens attached to the precision servo stage and a novel illumination unit. Performance of the developed machine vision system is verified in micro-drilling processes on glass using diamond and carbide drills.

关键词： Glass

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Switch synchronizing delayed feedback control for piecewise linear systems

Switch synchronizing delayed feedback control for piecewise ...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： Y. Toyosaki T. Ueta T. Kousaka Department of Information Science and Intelligent Systems Faculty of Engineering University of Tokushima Japan Center for Advanced Information Technology University of Tokushima Japan

This paper proposes switch synchronizing delayed feedback control (abbr. SSDFC) in the piecewise linear systems. This control method weeds out the unsuitable control input from the different piecewise continuous functions. As an illustrated example, we then apply this general methodology to a simple circuit containing state-period dependent switch. The unstable periodic orbit is stabilized effectively in the computer simulations. Finally, the performance of SSDFC is compared with delayed feedback control (DFC)

关键词： Switches Delay Feedback control Piecewise linear techniques Chaos control systems Digital-to-frequency converters Linear systems Linear feedback control systems Proportional control

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Etching characteristics of a silicon surface induced by focused ion beam irradiation

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International Journal of Manufacturing Technology and Management 2006年第1-2期9卷 34-50页

作者： Kawasegi, Noritaka Morita, Noboru Yamada, Shigeru Takano, Noboru Oyama, Tatsuo Ashida, Kiwamu Taniguchi, Jun Miyamoto, Iwao Momota, Sadao Graduate School of Science and Engineering Toyama University 3190 Gofuku Toyama 930-8555 Japan Department of Mechanical and Intellectual Systems Engineering Toyama University 3190 Gofuku Toyama 930-8555 Japan Advanced Manufacturing Research Institute National Institute of Advanced Industrial Science and Technology 1-2-1 Namiki Tsukuba Ibaraki 305-8564 Japan Department of Applied Electronics Tokyo University of Science 2641 Yamazaki Noda Chiba 278-8510 Japan Department of Intelligent Mechanical Systems Engineering Kochi University of Technology 185 Tosayamada Kochi Japan Graduate School of Science and Engineering Toyama University Toyama Japan Faculty of Engineering Toyama University Toyama Japan Faculty of Engineering Toyama University Japan National Institute of Advanced Industrial Science and Technology Tsukuba Japan National Institute of Advanced Industrial Science and Technology Japan Department of Applied Electronics Tokyo University of Science Chiba Japan Department of Applied Electronics Tokyo University of Science Japan Faculty of Engineering Kochi University of Technology Japan

The etching resistance characteristics of a Focused Ion Beam (FIB) irradiated silicon surface against KOH are investigated in this study. An FIB irradiated silicon surface can withstand etching in KOH solution, whereas the non-irradiated area is etched and consequently, a protruding nanostructure can be fabricated on the irradiated area. Height dependence of the nanostructure on the FIB irradiating conditions is investigated in order to control the shape of the nanostructure for application to three-dimensional nanofabrication. As a consequence, it was found that the height of the nanostructure can be controlled by FIB irradiating conditions such as dose and acceleration voltage. The mechanism is investigated by a selective etching method using HF solution. The results of a simulation indicate that the amorphous layer induced by ion irradiation is strongly related to this phenomenon. In addition, surface roughness and line width dependence was investigated, and these results indicate the potential use of this method as a novel three-dimensional nanofabrication process. Copyright © 2006 Inderscience Enterprises Ltd.

关键词： Silicon

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Robust Super-Exponential Methods for Blind Equalization of MIMO-IIR systems

Robust Super-Exponential Methods for Blind Equalization of M...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： K. Kohno Y. Inouye M. Kawamoto Department of Electronic and Control Systems Engineering Shimane University Shimane Japan Information Technology Research Institute National Institute of Advanced Industrial Science and Technology Ibaraki Japan

The so called "super-exponential" methods (SEMs) are attractive methods for solving multichannel blind deconvolution problem. The conventional SEMs, however, have such a drawback that they are very sensitive to Gaussian noise. To overcome this drawback, the robust super-exponential method (RSEM) were proposed for single-input single-output infinite impulse response (SISO-IIR) channels and for multi-input multi-output (MIMO) static channels (instantaneous mixtures). While the conventional SEMs use the second- and higher-order cumulants of observations, the RSEM uses only the higher-order cumulants of observations. Since higher-order cumulants are insensitive to Gaussian noise, the RSEM is robust to Gaussian noise. We proposed an RSEM extended to the case of MIMO-IIR channels (convolutive mixtures). To show the validity of the proposed RSEM, some simulation results are presented

关键词： Blind equalizers Gaussian noise Noise robustness MIMO Deconvolution Independent component analysis Signal processing Industrial electronics Centralized control control systems

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Robust Super-Exponential Methods for Blind Deconvolution of MIMO-IIR systems with Gaussian Noise

Robust Super-Exponential Methods for Blind Deconvolution of ...

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Proceedings of 2006 IEEE International Symposium on Circuits and systems,Volume 7

作者： Kiyotaka Kohno Yujiro Inouye Mitsuru Kawamoto Department of Electronic and Control Systems Engineering Shimane University Matsue Shimane Japan Information Technology Research Institute National Institute of Advanced Industrial Science and Technology Tsukuba Ibaraki Japan

The so called ''super-exponential" methods (SEMs) are attractive methods for salving multichannel blind deconvolution problem. The conventional SEMs, however, have such a drawback that they are very sensitive to Gaussian noise. To overcome this drawback, the robust super-exponential method (RSEM) were proposed for single-input single-output infinite impulse response (SISO-IIR) channels and for multi-input multi-output (MIMO) static channels (instantaneous mixtures). While the conventional SEMs use the second- and higher-order cumulants of observations, the RSEM nses only the higher-order cumulants of observations. Since higher-order cumulants are insensitive to Gaussian noise, the RSEM is robust to Gaussian noise, We proposed an RSEM extended to the case of MIMO-IIR channels (convolutive mixtures). To show the validity of the proposed RSEM, some simulation results are presented.

关键词： Noise robustness Deconvolution Gaussian noise MIMO Independent component analysis Signal processing Robust control Industrial electronics Centralized control control systems

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Online Detection and Classification of Disasters by a Multiple-input/single-output Sensor for a Home Security System

Online Detection and Classification of Disasters by a Multip...

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International Joint Conference on Neural Networks (IJCNN)

作者： T. Ishigaki T. Higuchi K. Watanabe Department of Statistical Science The Graduate University for Advanced Studies (SOKENDAI) Tokyo Japan System Control Engineering Department Hoxi University Tokyo Japan Prediction and Knowledge Discovery Research Center Research Organization of Information and Systems Tokyo Japan System Control Engineering Department Hosei University Tokyo Japan

Conventional sensors have been designed to minimize noise effects. Any sensor that is designed to detect a certain physical variable is influenced to a certain degree by other physical variables. This suggests that any sensor is potentially tap able of detecting multiple physical variables. In the present study, we consider sensing devices that are easily influenced by several physical variables and make full use of their multi-sensing characteristics through statistical signal processing and machine learning techniques with a wide variety of prior information. The proposed sensor design approach is completely different from the conventional approach with respect to system design and has advantages in terms of cost and system simplification compared to existing approaches. This new idea can be realized by developing a novel multiple-input/single-output sensor that can detect various variables such as pressure, acceleration, temperature and light emission by a single device. The sensor is applied to monitor the symptoms of tire, earthquake and break-in for the purpose of home security. The proposed security system consists of the following three steps: (1) detection of disaster by a probabilistic outlier detection procedure using an auto-regressive model, (2) disaster feature extraction by Kalman filter on a state space model, and (3) disaster classification by multiclass support vector machine.

关键词： Sensor systems Security Sensor phenomena and characterization Temperature sensors Signal processing Machine learning Costs Acceleration Monitoring Tires

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Output feedback/feedforward control of discrete linear repetitive processes for performance and disturbance rejection

Output feedback/feedforward control of discrete linear repet...

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American control Conference (ACC)

作者： B. Sulikowski K. Galkowski E. Rogers D.H. Owens A. Kummert Institute of Control and Computation Engineering University of Zielona Gora Zielona Gora Poland School of Electronics and Computer Science University of Southampton Southampton UK Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK Faculty of Electrical Information and Media Engineering University of Wuppertal Wuppertal Germany

Repetitive processes propagate information in two independent directions and are of both systems theoretic and applications interest. They cannot be controlled by direct extension of existing techniques from either standard (termed ID here) or 2D systems theory. Here we give new results on the design of physically based feedforward/feedback control laws to achieve desired performance and disturbance decoupling in the sense defined in the body of the paper. The new results are for the case when only output (as opposed to state) information is used to activate the control law

关键词： Output feedback Linear feedback control systems control systems Optimal control Process control Linear systems Stability Feedback control Algorithm design and analysis Iterative algorithms

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