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7th International Symposium on Advanced Control of Chemical Processes, AdCHEM 2003

作者： Lee, Yong Joon Sung, Su Whan Yoon, dae Sung Lim, Geunbae Park, Sunwon Department of Chemical and Biomolecular Engineering Center for Ultramicrochemical Process Systems Korea Advanced Institute of Science and Technology 373-1 Gusung-dong Yusung-gu Daejon305-701 Korea Republic of Corporate R&D LG Chem. Ltd. Research Park 104-1. Moonji-dong Yusung-gu Daejon305-380 Korea Republic of Biochip Project Team and MEMS Lab Samsung Advanced Institute of Technology San 14 Nongseo-Ri Kiheung-Eup Yongin-City Kyunggi-Do449-712 Korea Republic of

A thermal microsystem is developed which consists of a microreactor integrated with a platinum sensor/heater, and automation equipment/software such as data acquisition system, control program and graphic user interface. From the control point of view, we analyze the dynamic characteristics of the fabricated microreactor and find some interesting dynamic features. On the basis of the analysis, we suggest an appropriate model structure and estimate the model parameters using the prediction error identification method. requirements for a high-performance operation are discussed and a nonlinear control strategy is proposed to linearize the nonlinear dynamics of the thermal microsystem. We determine the parameters of the nonlinear controller using the optimal tuning method. The developed thermal microsystem shows much better control performances compared to commercial polymerase chain reaction (PCr) thermal cyclers. We successfully demonstrate the PCr of plasmid dNA using the thermal microsystem. Copyright © IFAC 2003

关键词： Polymerase chain reaction

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Modeling and Control of Thermal Microsystems

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IFAC Proceedings Volumes 2004年第1期37卷 105-111页

作者： Yong Joon Lee Su Whan Sung dae Sung Yoon Geunbae Lim Sunwon Park Department of Chemical & Biomolecular Engineering and Center for Ultramicrochemical Process Systems Korea Advanced institute of Science and Technology 373-1 Gusung-dong Yusung-gu Daejon 305-701 KOREA Corporate R&D LG Chem. Ltd. Research Park 104-1 Moonji-dong Yusung-gu Daejon 305-380 KOREA Biochip Project Team and MEMS Lab. Samsung Advanced Institute of Technology San 14 Nongseo-Ri Kiheung-Eup Yongin-City Kyunggi-Do. 449-712. KOREA

A thermal microsystem is developed which consists of a microreactor integrated with a platinum sensor/heater, and automation equipment/software such as data acquisition system, control program and graphic user interface. From the control point of view, we analyze the dynamic characteristics of the fabricated microreactor and find some interesting dynamic features. On the basis of the analysis, we suggest an appropriate model structure and estimate the model parameters using the prediction error identification method. requirements for a high-performance operation are discussed and a nonlinear control strategy is proposed to Iinearize the non linear dynamics of the thermal microsystem. We determine the parameters of the non linear controller using the optimal tuning method. The developed thermal microsystem shows much better control performances compared to commercial polymerase chain reaction (PCr) thermal cyclers. We successfully demonstrate the PCr of plasmid dNA using the thermal microsystem.

关键词： Thermal Microsystems System Identification Nonlinear Control PId Controller Polymerase Chain reaction

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Miniaturized thin-film magnetic field probe with high spatial resolution for LSI chip measurement

Miniaturized thin-film magnetic field probe with high spatia...

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IEEE International Symposium on Electromagnetic Compatibility (EMC)

作者： N. Ando N. Masuda N. Tarnaki T. Kuriyama S. Saito K. Kato K. Ohashi M. Saito M. Yarnaguchi Jisso and Production Technologies Research Laboratories NEC Corporation Sagamihara Japan System Devices Research Laboratories NEC Corporation Sagamihara Japan R&D Support Center NEC Corporation Tsukuba Japan Fundamental and Environmental Research Laboratories NEC Corporation Tsukuba Japan Nano Technology Research Laboratory Waseda University Tokyo Japan Department of Electrical and Communication Engineering Tohoku University Sendai Japan

It is important to obtain the absolute value of current flowing through each power line on a large-scale integrated (LSI) circuit by measurement because this current on an LSI chip is regarded as conductive noise. We have developed a thin-film magnetic field probe that has spatial resolution high enough to obtain the absolute value of high-frequency power current on an LSI chip. Spatial resolution was enhanced by miniaturizing the shielded loop coil, the detection part of the probe. The outer size of the new coil is 50/spl times/22 /spl mu/m. In taking measurements with the new probe over a 60 /spl mu/m wide microstrip line used as a device under test (dUT), we obtained a 6 dB decrease point of 40 /spl mu/m, which indicates the spatial resolution of the probe. This value is comparable to the typical width of power lines on an LSI chip, around 50 /spl mu/m and is less than half that of our conventional probes, around 90 /spl mu/m. In measurements with the new probe over an LSI chip, we obtained such a fine magnetic near-field distribution that the magnetic fields generated from the lines on the chip were separated. On-chip decoupling was also confirmed by using the new probe. The new probe enables direct verification of a circuit design for suppressing electromagnetic interference (EMI), while conventional coarse mapping of the magnetic near-field cannot be used to evaluate such conductive noise.

关键词： Magnetic field measurement Magnetic films Probes Spatial resolution Large scale integration Semiconductor device measurement Electromagnetic interference Conductive films Thin film circuits Integrated circuit measurements

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Effect of Anisotropic Yield Criterion for Sheet Metals on the Accuracy of Springback Simulation

Effect of Anisotropic Yield Criterion for Sheet Metals on th...

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The Sixth World Congress on Computational Mechanics in Conjunction with the Second Asian-Pacific Congress on Computational MechanicsⅠ

作者： T.Kuwabara S. Ikeda N. Suzuki X. Lemoine H. Hayashi Department of Mechanical Systems Engineering Tokyo University of Agriculture and Technology 2-24-16 Naka-cho Koganei-shi Tokyo 184-8588 Japan ESTECH CORP. 89-1 Yamashita-cho Naka-ku Yokohama Kanagawa 231-0023 Japan Forming Technologies R&D Center Nippon Steel Co. 20-1 Shintomi Futtsu Chiba 293-8511 Japan LEDEPP Arcelor 17 avenue des Tilleuls F-57190 Florange France RIKEN(The Institute of Physics and Chemical Reserach) 2-1 Hirosawa Wako 351-0198 Japan

A new testing method for evaluating springback characteristics of sheet metals is proposed. This testing method is based on the plane-strain stretch bending. We first designed and built an experimental apparatus to implement a plane-strain stretch bending test, that is one of the typical modes of deformation observed in real automotive body panels. The springback magnitude is defined as the change in curvature of the specimen before and after unloading. The effect on the magnitude of springback of the tensile stress applied to the specimen is examined for a high strength steel sheet. It is found that the magnitude of springback decreases with increasing tensile stress, and falls almost to zero when the tensile stresses are larger than the yield stress of the material. We next implemented an elastic-plastic fmite element analysis (FEA) for the plane-strain stretch bending. To determine an appropriate anisotropic yield function for modeling the work hardening behavior of the test material, biaxial tension testing[1] were performed on cruciform specimens. The observed work hardening behavior of the material agrees well with predictions based on Hosford's [2] or the Yld2000-2d [3] yield functions. The magnitude of springback according to FEA agrees well with the experimental results provided that an appropriate yield function is used in the computation.

关键词： Effect of Anisotropic Yield Criterion for Sheet Metals on the Accuracy of Springback Simulation

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Erratum to “Applications of telechelic polymers as compatibilizers and stabilizers in polymer blends and inorganic/organic nanohybrids [Polymer 45 (2004) 3527–3533]”

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Polymer 2004年第26期45卷 9071-9071页

作者： Jungahn Kim Sang Seob Kim Keon Hyeong Kim Yong Hyun Jin Soon Man Hong Seung Sang Hwang Bong-Gyoo Cho dong Youn Shin Seung Soon Im Polymer Hybrids Center Korea Institute of Science and Technology Seoul South Korea Industrial Waste Recycling R&D Center Daejeon 305-350 South Korea Youl Chon Chem. Co. Dong Jak-Gu Seoul South Korea Department of Textile Engineering Hanyang University Seoul South Korea

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A Calculation method for indicated mean effective pressure based on harmonic analysis of pressure waveform

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International Journal of Engine research 2003年第2期4卷 87-101页

作者： Tsuchiya, K. Nagashima, K. Department of Mechanical Engineering Informatics School of Science and Technology Meiji University Japan Honda Motor Tochigi R&D Center Japan

A new method for calculating indicated mean effective pressure (i.m.e.p.) was derived from harmonic analysis of pressure waveform in working space, instead of conventional numerical integration of the pressure-volume (P-V) diagram. The method is applicable to a number of displacement-type machines including engines. This paper first introduces a generalized i.m.e.p. equation, then derives the specific i.m.e.p. equations for various mechanisms such as the piston-crank, swash plate, etc. The proposed i.m.e.p. equations introduced show that i.m.e.p. is determined by very low frequency components, of less than several hundred Hz, included in the pressure waveform. The reason is that the amplitude of volumetric variation becomes rapidly smaller as the order of its harmonics increases. This means that the i.m.e.p. equations proposed are more accurate where the number n of sam-pling pressure data per cycle is decreased and allow highspeed calculation as compared with the conventional method. The error of the i.m.e.p. equation for internal combustion engines with a piston-crank driving mechanism is less than ±0.1 per cent. For a Stirling engine with a ross yoke drving mechanism the erros is less than 0.4 per cent, even if n is decreased until four per cycle because the pressure waveform is close or similar to the sinusoidal wave. The digital i.m.e.p. meter developed as an application of the i.m.e.p. equation is also described, and its validation is discussed. © 2003, Institution of Mechanical Engineers. All rights reserved.

关键词： control indicated mean effective pressure (i.m.e.p.) measurement on-board i.m.e.p. meter

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Semi-batch Crystallization of 7-Amino-desacetoxycephalos- poranic Acid

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Chinese Journal of Chemical engineering 2003年第4期11卷 399-402页

作者：王静康刘越 The State R&D Center of Industrial Crystallization School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072 China

Semi-batch crystallization of 7-amino-desacetoxycephalosporanic acid (7-AdCA) is a complicated process, in which agglomeration occurs together with nucleation and crystal growth. To systematically study such a process, experiments were conducted to estimate the crystallization thermodynamics and kinetics, and then the process was simulated by a numerical method. The application of Monte Carlo concept in the algorithm to describe agglomeration event offers an alternative approach of solving the population balance, the intrinsic simplicity of which allows us to investigate several mechanisms and include several internal coordinates in the analysis. Furthermore, present study may be a valuable paradigm for other semi-batch crystallization processes.

关键词： 7-AdCA thermodynamics kinetics agglomeration Monte Carlo simulation

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Carbon Nanofiber reinforced Composites for Enhanced Conductivity, Strength, and Tensile Modulus

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MrS Online Proceedings Library 2003年第1期733卷 1-5页

作者： Gary G. Tibbetts Ioana C. Finegan Choongyong Kwag Materials and Processes Laboratory General Motors R&D Center Warren USA Industrial and Engineering Technology Central Michigan University Mount Pleasant USA

Carbon nanofibers of diameter 200 nm may be used as an additive to thermoplastics for applications requiring electrical conductivity and enhanced mechanical properties. The electrical properties of nanofiber in thermoplastics such as nylon and polypropylene and are very attractive compared with those provided by other conventional conducting additives. Because of the low diameter of the nanofibers used, the onset of electrical conductivity (percolation threshold) can be below 1 volume %. Because of the highly conductive nature of the fibers, particularly after a graphitization step, the composites can reach resistivities as low as 0.15 Ohm cm. These conducting composites may be used for applications such as radio frequency interference shielding, primerless electrostatic painting, and static discharge. In order to make composites having excellent mechanical properties, good adhesion between fiber and matrix is essential. Carbon nanofiber-matrix adhesion was studied after surface treating the fibers using a variety of methods. Among as-grown fibers, those produced with longer gas phase feedstock residence times in the fiber growth reactor were less graphitic but adhered to a polypropylene matrix better, giving improved tensile strength and modulus Two chemical treatments were found to be somewhat effective in increasing tensile strength, but both decreased the modulus.. A modest degree of oxidation was also found to increase adhesion to the matrix and increase composite tensile strength, while extended oxidation attacked the fibers sufficiently to decrease composite properties.

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Short range Structure of Molten CsCl - NaCl Mixtures Obtained by XAFS Analysis

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ECS Proceedings Volumes 2004年第1期2004-24卷

作者： Haruaki Matsuura Sou Watanabe Hiroshi Akatsuka Tetsuo Honma Norimasa Umesaki Akihiko Kajinami Keiichi Takase Norikazu Ohtori Yasuhiko Iwadate reiko Fujita Ashok K. Adya Research Laboratory for Nuclear Reactors Tokyo Institute of Technology 2-12-1-N1-10 O-okayama Meguro-ku Tokyo 152-8550 Japan Japan Synchrotron Radiation Research Institute Mikazuki Hyogo 679-5198 Japan Faculty of Engineering Kobe University 1-1 Rokkodai Nada-ku Kobe 657-8501 Japan Graduate School of Science and Technology Niigata University Ikarashi-Ninocho Niigata 950-2181 Japan Graduate School of Science and Technology Chiba University Inage-ku Chiba 263-8522 Japan Power & Industrial Systems R&D Center Toshiba Corporation 4-1 Ukishima-cho Kawasaki-ku Kawasaki 210-0862 Japan School of Contemporary Sciences University of Abertay Dundee Bell Street Dundee DD1 1HG U. K.

The local structure of molten 2CsCl-NaCl has been investigated for the first time by XAFS measurements carried out on SPring-8 at the K-absorption edge of Cs. The nearest-neighbor Cs+-Cl− distances and coordination numbers were found to be 3.26Å and 5.44 for CsCl, and 3.22Å and 5.85 for 2CsCl-NaCl, respectively. The parameters obtained for molten CsCl are in good agreement with those derived from the previous neutron diffraction studies by using isotopic substitution on chlorine. The Cs+-Cl− distance in 2CsCl-NaCl is found to be slightly shorter than that in pure CsCl, and Cs+ is coordinated to ca. 6 chlorides in 2CsCl-NaCl.

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A network authentication system with multi-biometrics

A network authentication system with multi-biometrics

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Asia-Pacific Conference on Communications

作者： S. Seno T. Sadakane Y. Baba T. Shikama Y. Koui N. Nakaya Information Technology R&D Center Mitsubishi Electric Corporation Limited Kamakura Japan Faculty of Engineering Iwate University Morioka Japan

In view of the recent increase of incidents over the Internet and other networks, the role of authentication techniques to prevent unauthorized access by malicious users becomes more significant. User authentication methods can be classified into three categories: (1) methods based on human memory such as passwords, (2) methods based on physical devices such as magnetic or IC cards, and (3) methods based on biometrics such as fingerprint and iris. As the first two categories cannot escape vulnerabilities caused by forgetfulness or losses, the third category attracts much attention in these days. This paper proposes a network authentication system with multi-biometrics to support various applications where user authentication is necessary. In particular, it can provide authentication services to a workflow process that is a typical intranet application. The paper also discusses the prototype implementations developed after the proposed system and their evaluation.

关键词： Authentication Biometrics Humans Fingerprint recognition Iris Magnetic devices Prototypes data mining Bioinformatics Information technology

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