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Royal Academy of Medicine in Ireland - Section of Bioengineering - Proceedings of meeting held in Dundalk, Co. Louth, in February 1998.

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IRISH JOURNAL OF MEDICAL SCIENCE 1998年第4期167卷 256-276页

作者： [Anonymous] Orthopaedic Research Unit The Queen’s University of Belfast School of Biomedical Sciences The Queen’s University of Belfast Howmedica International Ltd. Raheen Industrial Estate Limerick Department of Mechanical Engineering Trinity College Dublin 2 Mater Hospital Dublin 7 Orthopaedic Research Laboratory Århus University Hospital Denmark University of Limerick Limerick Limerick Regional Hospital Raheen Limerick Boston Scientific Ireland Ltd. Galway Department of Mechanical Engineering University College Dublin Dublin Department of Electrical and Electronic Engineering University College Dublin Dublin Bioengineering Research Centre Department of Mechanical Engineering University College Dublin Dublin Northern Ireland Bio-Engineering Centre (NIBEC) School of Electrical and Mechanical Engineering University of Ulster Newtownabbey Department of Mechanical & Manufacturing Engineering The Ashby Building The Queen’s University of Belfast Johnson and Johnson Professional Orthopaedic Division Queensway England Department of Cardiology and Department of Medical Physics & Bioengineering St. James’s Hospital Dublin 8 Burke House Ellison Street Castlebar Royal College of Surgeons in Ireland Department of Surgery Beaumont Hospital Dublin Department of Electronic and Electrical Engineering Trinity College Dublin 2 Department of Aeronautical Engineering The Queen’s University of Belfast Vascular Unit Belfast City Hospital Department of Medical Physics and Bioengineering St. James’s Hospital Dublin 8 Centre for Biomedical Electronics Department of Electronic and Computer Engineering University of Limerick Limerick Department of Mechanical and Aeronautical Engineering University of Limerick Limerick School of Health Sciences University of Ulster Ireland School of Physiotherapy University of Ulster Newtownabbey Clinical Engineering NI Medical Physics Agency Belfast and Radiology Royal Victoria Hospital Musgrave Park Hospital University of Limerick Biomedical Institute (ULBMI) Uni

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An open software architecture for batch process simulation

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COMPUTERS & chemical engineering 1997年第Sup期21卷 S769-S773页

作者： Fritz, M Engell, S Process Control Group Dept. of Chemical Engineering University of Dortmund D-44221 Dortmund Germany

Simulation of recipe driven batch processes is a complex demanding task. It can be performed either with general purpose simulators, causing a high modelling effort, or with specific tools which often lack flexibility. Neither of these approaches is appropriate in all cases. In this contribution, we outline a software architecture for batch process simulation which is flexible enough to be adapted to meet the particular requirements of the simulation problem at hand. It consists mainly of the elements model creation, output clients, simulator, and user interface. All these components are exchangeable to offer the software solution which is best suited for the specific problem. The software concepts are presented in terms of design patterns.

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Identification of reduced order average linear models from nonlinear dynamic simulations

Identification of reduced order average linear models from n...

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American control Conference (ACC)

作者： W.A. Docter C. Georgakis Chemical Process Modeling and Control Research Center Department of Chemical Engineering Lehigh University Bethlehem PA USA

Presents a general methodology for the identification of average linear low order models (ALLOM) from data collected from detailed nonlinear models. While there are many methods available in the literature for identifying linear models, these methods tend to produce inaccurate and ill-conditioned models when used on nonlinear data sets. The method in this paper differs from traditional linearization methods in that it better approximates the dynamic characteristics over a wider area around the reference steady state.

关键词： Signal processing Predictive models Open loop systems chemical processes process control chemical engineering Steady-state Separation processes Thermodynamics State estimation

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Closed-Loop Identification of State Space Models using Subspace Techniques

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IFAC Proceedings Volumes 1997年第9期30卷 37-42页

作者： Hemant Jha Christos Georgakis Chemical Process Modeling and Control Research Center and Department of Chemical Engineering Lehigh University Bethlehem Pennsylvania 18015 Phone: (610)-758-5432 Fax:(610)-758-5297

The paper presents a subspace algorithm which identifies the process model from closed-loop data. The algorithm is based on the use of a closed-loop oblique projection for the direct identification of the plant dynamics. This closed-loop oblique projection is particularly useful because it eliminates the use of a minimal realization step after the identification has been performed. Similar to the open-loop algorithm, the proposed closed-loop algorithm is ideally suited for MIMO problems.

关键词： Closed-loop Identification Subspace Methods State Space Models Multivariable Systems Matrix Projection

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Neural network-based feedforward control of two-stage heat exchange process

Neural network-based feedforward control of two-stage heat e...

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IEEE International Conference on Systems, Man and Cybernetics

作者： A. Blazina N. Bolf Dept. of Meas. & Autom. Process Control Zagreb Univ. Croatia Faculty of Chemical Engineering aud Techology Department of Measurement and Automatic Process Control University of Zagreb Zagreb Croatia

An approach to the neural network-based feedforward control of a two-stage heat exchange process is presented. When pressure change occurs in the distillation column, the disturbance causes a variation of material balance that produces undesirable material and heat imbalance. The task is fulfilled first by developing a mathematical model in a traditional way, followed by the implementation of a neural network multilayer feedforward-based controller. The dynamics and unsteady state are investigated.

关键词： Neural networks Feedforward neural networks Temperature control Manipulator dynamics Feedback control Three-term control Databases Convergence Liquids Spirals

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Future Needs for the control Theory in Industries–Report and topics of the control techllology survey in Japanese industry–

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IFAC Proceedings Volumes 1997年第9期30卷 281-286页

作者： Haruo Takatsu Toshiaki Itoh Mituhiko Araki Control System Center Yokogawa Electric Corporation 2-9-22 Naka-cho Musashino-shi Tokyo 180 Japan Production Technology Division Mitsubishi Chemical Corporation 2-5-2 Marunouchi Chiyoda-ku Tokyo 100. Japan Dept. Electrical Engineering Kyoto University Yoshida-Honmachi Sakyo-ku Kyoto 606-01 Japan

A survey on applications of control technologies in Japanese industries is made based on the inquiry investigation conducted in 1995 by SICE. To the inquiry investigation, 148 engineers from 110 factories responded and gave 148 examples of applications. The survey also makes use of the data of the similar investigation conducted in 1989 by JEMIMA for comparison purpose. Several statistics about characteristics of plants, areas of applications, advantage and disadvantage of each technology, expectations of engineers, etc. are given, which clarifies several features of the future needs for control theory.

关键词： control theory statistics of applications industrial needs

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Reference system based model predictive control

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IFAC Proceedings Volumes 1996年第1期29卷 5923-5928页

作者： Lokesh Kalra Chriatos Georgakis Chemical Process Modeling and Control Research Center and Department of Chemical Engineering Lehigh University Bethlehem Pennsylvania USA

Despite recent advances in the field, the tuning of presently popular Model Predictive control formulations is largely a trial and error procedure. Motivated by this fact, a Reference System based tuning is explored through Reference System Model Predictive control. The RS-MPC algorithm is examined because of its potentially more intuitive approach to tuning. Under this methodology the tuning involves the selection of two parameters for each controlled variable. The first parameter adjusts the shape of the response and the second one affects the speed. Using these, instead of the weight-based tuning of conventional MPC, much of the trial and error is eliminated. The most important features of the controller arc elucidated through the performance of the STSO and MIMO cases for the Amoco Fluid Catalytic Cracker process simulation.

关键词： Multivariable Feedback control Predictive control Models Tuning Characteristics control Algorithms Simulators

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Decentralized PCA Charts for Performance Assessment of Plant-Wide control Structures

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IFAC Proceedings Volumes 1996年第1期29卷 5894-5898页

作者： Christos Georgakis Bethany Steadman Vincenzo Liotta Chemical Process Modeling and Control Research Center and Department of Chemical Engineering Lehigh University Bethlehem Pennsylvania USA

Static principal component analysis (PCA) statistical charts are used to assess and compare the performance of two plant-wide control strategies of the Tennessee Eastman process. Both centralized and decentralized charts are used as well as charts relating to the energy and material balance of the process. In most cases these charts reveal the origin of the disturbance and the effectiveness of the control structure to compensate for the disturbance. Differences and similarities between the two control structures are also examined.

关键词： process control large scale systems multivariable feedback systems multivariable quality control control schemes disturbance localization disturbance rejection

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Extended Observers for the Polymerization of Polyethylenterephthalate

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IFAC Proceedings Volumes 1996年第1期29卷 5971-5976页

作者： Paul Appelhaus Sebastian Engell Process Control Group Dept. of Chemical Engineering University of Dortmund D-44221 Dortmund Germany

In the batch polymerization of polyethylenterephthalate, the main reaction is an equilibrium-reaction. The removal of ethylenglycol from the melt determines the velocity of the polycondensation process, because it shifts the equilibrium to the side of chain growth. In this paper we report on the design of extended observers for the estimation of the mass-transport parameter β-a for this process. Fixed-gain and gain-scheduled observers are considered as well as an EKF. The design process is described in detail.

关键词： nonlinear observer extended Kalman filter gain-scheduled observer polymerization processes modelling

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A device simulation of the BBT effect in flash memory cells and implications for the development of high-reliability memory cells

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第11期79卷 51-57页

作者： Hayashi, T Fukuda, K Ohno, M Nishi, K Kita, A VLSI R&D Center OKI Electric Industry Company Ltd. Hachioji-shi Japan 193 Graduated from the Science University of Tokyo Dept. of Applied Physics in 1986 and joined Oki Electric. Since then he has been engaged in research on the reliability of MOS transistors and silicon oxide films. Since 1994 he has been engaged in the development of flash memory. He is a member of the Applied Physics Society. Graduated from the University of Tokyo Dept. of Applied Physics in 1983 and joined Oki Electric in 1985. Since then he has been engaged in research on the semiconductor process and device simulation. In 1990 he participated in joint research at the Technical University of Aachen. He is a member of the Applied Physics Society. Graduated from the Tokyo University of Agriculture and Technology Dept. of Electrical Engineering in 1980 and completed an MS course in 1983. In 1986 he completed the doctoral course at Shizuoka University. He then joined Oki Electric where he has been engaged in research on ULSI processes. He is now a manager responsible for flash memory at the VLSI R&D Center. He holds a doctorate in engineering. He is a member of the Applied Physics Society. Graduated from the University of Tokyo Dept. of Applied Physics in 1973 and joined Oki Electric. He was engaged in the development of integrated circuit logic simulation technology and bipolar process technology and since 1980 he has been engaged in research on process/device simulation and modeling. Presently he is a senior manager at the VLSI R&D Center. In 1982–1984 he was a Visiting Scholar at MIT. He holds a doctorate in engineering. He is a member of the Applied Physics Society and a senior member of IEEE. Graduated from Tokyo Institute of Technology Dept. of Chemical Engineering in 1978 and completed the MS program in 1930. In that year he joined Oki Electric. Since then he has been engaged in CMOS process design for DRAM and flash memory. He is now a manager at the VLSI R&D Center. He is a member of the Applied Physics Society.

In order to analyze the BBT (band-to-band tunneling) phenomenon in flash memory cells by simulation, a new model is proposed, which improves on the BBT model by introducing the concept of ''average electric field.'' This model agrees well with the measured results in a wide drain N-concentration range. Using this model, the reliability of memory cells is analyzed. It is found that the difference of the amount of BBT generation does not directly affect the endurance characteristics but does affect the disturb characteristics. The same model can be used to analyze problem points of the present cells and to estimate the BBT current of next-generation devices accurately.

关键词： band-to-band tunneling flash memory simulation endurance characteristics

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