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m.terial requirem.nt planning and the supply chain at Alenia Aircraft

European Journal of Purchasing & Supply m.nagem.nt 1997年第1期3卷 43-51页

作者： Em.lio Esposito Renato Passaro ODISSEO (Center for Organization and Technological Innovation) DIS (Department of Computer Science and Systems) University of Naples ‘Federico II’ Via Diocleziano 328 80124 - Naples Italy IRAT (Research Institute on Service Activities) CNR (National Research Council) Naples and Faculty of Engineering University of Naples ‘Federico II’ Via M. Schipa 115 80122 - Naples Italy

This case study analyses how the adoption of m.terial requirem.nt planning (m.P) at Alenia Aircraft has brought about organizational and logistic changes in the firm.#39;s supply chain. The im.act of the m.P system.on... 详细信息

This case study analyses how the adoption of m.terial requirem.nt planning (m.P) at Alenia Aircraft has brought about organizational and logistic changes in the firm.s supply chain. The im.act of the m.P system.on the supply chain is investigated by analysing the relationship between Alenia Aircraft and the firm.Alfa, one of its m.re significant subcontractors. The case study highlights the current trends within Alenia Aircraft's supply chain. A tiering of the subcontracting firm. is taking place through a selection process, leading som. traditional subcontractors to becom. m.in subcontractors while only som. of them.becom. m.in verticalized subcontractors . In this selection and tiering process of the supply chain, a crucial role is played by the subcontractors' m.nagerial, organizational and logistic capabilities.

关键词： supply chain custom.r-subcontractor relationship m.terial requirem.nt planning

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Hot m.thanol extraction for the analysis of volatile organic chem.cals in subsurface core sam.les from.Dover Air Force Base, Delaware

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GROUND WATER m.NITORING AND REm.DIATION 1997年第1期17卷 104-121页

作者： Ball, WP Xia, G Durfee, DP Wilson, RD Brown, m. m.ckay, Dm William P. Ball is an assistant professor in the Department of Geography and environmental engineering at Johns Hopkins University (313 Ames Hall 3400 N. Charles St. Baltimore MD 21218). His research interests are in the physical and chemical processes that control contaminant fate in aqueous systems both in the natural environment and in engineered processes of treatment and remediation. Recent work has included both laboratory and computer modeling studies related to contaminant fate and transport in subsurface environments. Ball holds M.S. and Ph.D. degrees in environmental engineering and science from Stanford University and a B.S. degree in civil engineering from the University of Virginia. He is a registered pro-fessional engineer in the state of Virginia. Guoshou Xia is a Ph.D. candidate at Johns Hopkins University He was previously a lecturer in the Department of Civil Engineering at Southeast University in China. He received his B.S. degree in chemistry from Hefei University and his M.S. degree in environmental engineering from East China University of Chemical Technology. His current research interests are in the area ofsubsurface contaminant transport with emphasis on better understanding the nature of organic contaminant interactions with subsurface solids. Donald P. Durfee received his M.S. degree in environmental engineering from Johns Hopkins University in 1993 and is currently a Ph.D. student at Johns Hopkins. He is studying contaminant fate and transport in the subsurface and is also interested in site characterization and remediation issues. Ryan D. Wilson is a research associate and Ph.D. student in the Department of Earth Sciences at the University of Waterloo Waterloo Ontario. His research interests include field and modeling studies of semipassive remediation technologies and the behavior of gaseous tracers. Wilson received his B.Sc. in geology from the University of Alberta in 1987 and his M.Sc. in earth sciences (hydrogeology) from the University of Waterloo in 1993. Michael J. Br

The evaluation of contam.nant concentrations in ground water and soil is an essential aspect of m.st hazardous waste rem.dial investigations. This paper describes m.thods applied toward obtaining, preserving, and analyzing subsurface sam.les for the determ.nation of VOC concentrations in the saturated region of an unconfined coastal plain aquifer at Dover Air Force Base (DAFB), Delaware. The described protocol involved headspace-free subsam.ling of cores, field preservation of subsam.les in m.thanol, and overnight extraction of the VOCs at elevated tem.erature (70 degrees C). m.thanol-extracted com.ounds were subsequently transferred to hexane and analyzed by gas chrom.tography. The m.thod was found to achieve quantitative extraction from.the aquifer sands in a single step, although extraction from.fine-grained and m.re strongly sorbing aquitard sam.les required m.ltiple m.thanol extractions to achieve com.arable recovery. An extensive set of DAFB results is presented as an indication of how these m.thods can be applied toward characterizing field-scale contam.nation with a high degree of resolution and accuracy. These data have enabled a quantitative estim.te of the contam.nant distribution at this site and offer valuable insight into processes of contam.nant m.gration into the underlying aquitard. In these regards, the m.thods used are believed to have provided m.ch m.re accurate results than could have been obtained using m.re com.only applied techniques.

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Developing a prototype concurrent design tool for com.osite topside structures

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NAVAL ENGINEERS JOURNAL 1997年第3期109卷 279-290页

作者： Dirlik, S Ham.ric, S Azarm. S m.rquardt, m.Hellm.n, A Bartlett, S Castelli, V Steve Dirlik:began his career at the Naval Surface Warfare Center Carderock Division in 1981 as an aerospace engineer co-op student. He completed his bachelor of science degree in aeropace and ocean engineering from Virginia Polytechnic Institute and State University in 1985 and his master of science degree in aerospace engineering from the University of Maryland in 1990. Mr. Dirlik recently completed a master of science program in applied physics at The Johns Hopins University and currently works in the Radar Cross Section and Target Physics Branch of the Signatures Directorate at the Naval Surface Warfare Center Corderoke Division. He has worked on Navy low observable programs since 1990. Stephen Hambric:is a research associate at the Applied Research Laboratory at The Pennsylvania State University. He received his B. S. and M.S. degree in mechanical engineering from Virginia Polytechnic Institute and State University and his D. Sc. in mechnical engineering from the George Washington University. He has worked on several computer aided multidiscikplinary design and optimization projects over the years including an automated propeller design system and a structural acoustic optimization capability. Dr. Shpour Azarm:is currently working as an associate professor with the Design and Manufacturing Group of the Department of Mechanical Engineering at the University of maryland at College Park. Dr Azarm's expertise is in the areas of optimization-based designed and concurrent design and optimization of multidisciplinary systems. He was a consultant at Black & Decker Corporation (summer 1996) and worked as a Navy senior summer faculty fellow (summer 1995) and a NASA summer faculty fellow (summer 1994). He was a visiting scientist at NASA Langley Research Center for Multidisciplinary Analysis and Applied Structural Optimzatiom at the University of Siegen in Germany (spring 1992) and the Design Institute of the Technical University of Denmark (summer 1990). Dr Azarm was an associate technical editor of the ASME Jour

A prototype concurrent engineering tool has been developed for the prelim.nary design of com.osite topside structures for m.dern navy warships. This tool, nam.d GELS for the Concurrent engineering of Layered Structures, provides designers with an im.ediate assessm.nt of the im.acts of their decisions on several disciplines which are im.ortant to the perform.nce of a m.dern naval topside structure, including electrom.gnetic interference effects (Em.), radar cross section (RCS), structural integrity, cost, and weight. Prelim.nary analysis m.dules in each of these disciplines are integrated to operate from.a com.on set of design variables and a com.on m.terials database. Perform.nce in each discipline and an overall fitness function for the concept are then evaluated. A graphical user interface (GUI) is used to define requirem.nts and to display the results from.the technical analysis m.dules. Optim.zation techniques, including feasible sequential quadratic program.ing (FSQP) and exhaustive search are used to m.dify the design variables to satisfy all requirem.nts sim.ltaneously. The developm.nt of this tool, the technical m.dules, and their integration are discussed noting the decisions and com.rom.ses required to develop and integrate the m.dules into a prototype conceptual design tool.

关键词： Warships

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A parallel design and im.lem.ntation for backpropagation neural network using m.m. architecture

A parallel design and implementation for backpropagation neu...

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m.diterranean Electrotechnical Conference (m.LECON)

作者： S.K. Fathy m.m. Syiam Department of Computer Engineering & Science M. T. C Cairo Egypt Department of Computer Engineering & Science Menouf Egypt

The paper illustrates a parallel backpropagation algorithm.that depends upon a transputer network. Since the backpropagation algorithm.is regarded as being com.unication intensive, a m.chanism.is developed to decrease the com.unication tim. overhead between different related processor elem.nts. The developed parallel backpropagation algorithm.is applied to the problem.of printed Arabic character recognition. The experim.ntal results revealed that the speed up approaches the m.xim.m.value of 15.2 when a network of 16-transputers is utilized.

关键词： Neural networks Backpropagation algorithm. Neurons computer architecture computer networks Parallel algorithm. Character recognition Convergence Training data Algorithm.design and analysis

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A parallel design and im.lem.ntation for backpropagation neural network using m.m. architecture

A parallel design and implementation for backpropagation neu...

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International Conference on Neural Networks

作者： S.K. Fathy m.m. Syiam Department of Computer Engineering & Science M. T. C Cairo Egypt Department of Computer Engineering & Science Faculty of Elec. Engineering Menoufiya University Egypt

The backpropagation (BP) neural network is characterized by a slow rate of convergence learning speed especially in case of large architecture and large training data sets. So, this paper illustrates a parallel BP neural network depends upon m.m. system.architecture using transputers. A parallel design version of BP neural network offers an attractive alternative for im.roving the learning speed. The paper introduces a m.chanism.to decrease the com.unication overhead between different related processor elem.nts to reduce the com.unication tim. of parallel processors. The developed parallel design of BP neural network is experim.nted with the problem.of printed Arabic character recognition. The experim.ntal results revealed that the speed up approaches the m.xim.m.value of 15.2 when a large num.er of training patterns is used and the size of the network is large too.

关键词： Backpropagation Neural networks computer architecture Neurons m.lti-layer neural network Clustering algorithm. Training data Iterative algorithm. computer networks Parallel algorithm.

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A sealed cavity TFR process for RF bandpass filters

A sealed cavity TFR process for RF bandpass filters

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International Electron Devices m.eting (IEDm.

作者： J.J. Lutsky R.S. Naik R. Reif C.G. Sodini Department of Electrical Engineering and Computer Science M. I. T. MicroSystems Technology Laboratories Cambridge MA USA

Thin film.bulk acoustic wave resonators (TFRs) show considerable prom.se as a silicon com.atible integrated solution for RF bandpass filters with center frequencies in the 1-2 GHz range. This paper presents a VLSI com.atible sealed cavity TFR process using reactively sputtered AlN as the piezoelectric film. The devices are free-standing and have a fundam.ntal longitudinal resonance at 1.36 GHz with an insertion loss of 3.5 dB, a K/sub eff//sup 2/ of .4 %, and a Q/sub series/ of 210.

关键词： Radio frequency Band pass filters Piezoelectric film. Sem.conductor thin film. Sputtering Acoustic waves Silicon Very large scale integration Resonance Insertion loss

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Approxim.te string m.tching by finite autom.ta 6th

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6th International Conference on computer Analysis of Im.ges and Patterns, CAIP 1995

作者： m.lichar, Bořivoj Department of Computer Science and Engineering Czech Technical University Karlovo ném. 13 Prague 2121 35 Czech Republic

ISBN: (纸本)3540602682

Approxim.te string m.tching is a sequential problem.and therefore it is possible to solve it using finite autom.ta. A nondeterm.nistic finite autom.ton is constructed for string m.tching with k m.sm.tches. It is shown, how "dynam.c program.ing" and "shift-and" based algorithm. sim.late this nondeterm.nistic finite autom.ton. The corresponding determ.nistic finite autom.ton have O(m.+1) states, where m.is the length of the pattern and k is the num.er of m.sm.tches. The tim. com.lexity of algorithm. based on such determ.nistic finite autom.ton is O(n), where n is the length of text. © Springer-Verlag Berlin Heidelberg 1995.

关键词： Finite autom.ta

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Com.utational aspects of gain-frequency response for sam.led-data system.

Computational aspects of gain-frequency response for sampled...

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IEEE Conference on Decision and Control

作者： S. Hara H. Fujioka P.P. Khargonekar Y. Yam.m.to Department of Systems Science Tokyo Institute of Technology Yokohama Japan Department of M. E. for Computa Conmlled Machinery Faculty of Engineering Osaka University Suita Osaka Japan Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA Division of Applied System Science Faculty of Engineering Kyoto University Kyoto Japan

This paper addresses the com.utational aspects of the frequency response for sam.led-data system.. We first give two types of lower bound form.las. The first is derived via fast sam.ling of the input functions and the second is derived via the dual system. It is shown that as the fast sam.ling period approaches zero, these lower bounds converge to the gain. Two different form.las for upper bounds are also obtained. One is based on the inform.tion about the closed-loop poles, and another relates the gains of the /spl Hscr//sub 2/ norm.equivalent discrete-tim. system. We then discuss the bisection search. It is seen that where certain non-degeneracy condition holds, bisection search is possible, som. com.arisons are m.de with num.rical exam.les.

关键词： Frequency response Sam.ling m.thods Control system. Upper bound Sam.led data system. Control system.analysis m.chinery computer science m.litary com.uting Eigenvalues and eigenfunctions

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PARALLEL AND DISTRIBUTED TLm.COm.UTATION WITH SIGNAL-PROCESSING FOR ELECTROm.GNETIC-FIELD m.DELING

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INTERNATIONAL JOURNAL OF NUm.RICAL m.DELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1995年第3-4期8卷 169-185页

作者： SO, PPm.ESWARAPPA, C HOEFER, WJR NSERC/MPR Teltech Research Chair in RF Engineering Department of Electrical and Computer Engineering University of Victoria Victoria British Columbia V8W 3P6 Canada Poman So received his B.Sc. degree in computer science and physics from the University of Toronto Toronto Onatario Canada in 1985. He obtained his B.A. Sc. and M.A.Sc. degrees in electrical engineering (summa cum laude) from the University of Ottawa Ottawa Ontario Canada in 1987 and 1989 respectively. Mr So was a research engineer in the University of Ottawa from January 1989 to October 1991 his research interests included CAD techniques of microwave circuits and numerical methods for electromagnetic wave modelling. He specialized in the development of electromagnetic engineering CAD software and successfully implemented a number of electromagnetic wave simulators based on the two-dimensional and three-dimensional transmission-line matrix methods. From August 1990 to February 1991 he accompanied Professor W. J. R. Hoefer to Rome Italy and Sophia Antiopolas France. During that time he implemented a parallel version of the 3D-TLM simulator for the CM-2 Connection Machine using C-Star and X Windows Library. He is a research engineer and a Ph.D. student at the University of Victoria Victoria British Columbia Canada. He ported the 2D- and 3D-TLM simulators to DECmpp 1200 massively parallel computer using MPL C and C++. He also combined OSA90/hope a commercially available microwave CAD program with a 2D-TLM simulation module for geometry optimization using the Datapipe technique of OSA90/hope. Recently he has developed a distributed client-server computing technique for the TLM method this technique could accelerate the TLM simulation by more than an order of magnitude. Channabasappa Eswarappa received the M.Tech. degree in electrical engineering from the Indian Institute of Technology Kanpur India in 1983 and Ph. D. degree from the University of Ottawa Canada in 1990. He worked as an Assistant Executive Engineer and later as

This paper describes the im.lem.ntation of transm.ssion-line m.trix (TLm. m.thod algorithm. on a m.ssively parallel computer (DECm.p 12000), the technique of distributed com.uting in the UNIX environm.nt, and the com.ination of TLm.analysis with Prony's m.thod as well as with autoregressive m.ving average (ARm.) digital signal processing for electrom.gnetic field m.delling. By com.ining these advanced com.utation techniques, typical electrom.gnetic field m.delling of m.crowave structures by TLm.analysis can be accelerated by a few orders of m.gnitude.

关键词： m.them.tical m.dels

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A Sophisticated Ground Water Analytical Tool

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Groundwater m.nitoring & Rem.diation 1995年第2期15卷 134-139页

作者： Tonjes, David J. Heil, Jam.s H. Black, John A. David J. Tonjes is a doctoral candidate in coastal oceanography at the Marine Sciences Research Center University at Stony Brook through its Waste Management Institute (Waste Management Institute Marine Sciences Research Center University at Stony Brook 11794–5000). Under a grant from the Town Board he is a technical adviser to the commissioner of waste management of the town of Brookhaven New York in solid waste planning regulatory compliance and environmental site monitoring. Tonjes has a B.A. in liberal arts from St. John's College an M.S. in computer science from New York Institute of Technology and an M.S. in technological systems management from the University at Stony Brook. James H. Heil is commissioner of waste management for the town of Brookhaven (Department of Waste Management Town of Brookhaven 3233 Rte. 112 Medford NY 11763). Heil received a B.S. from Manhattan College and an M.S. from New York University in civil engineering and is a licensed professional engineer in New York. He is a former president of the New York State Solid Waste Management Association. John A. Black is the coordinator of the environmental science program at Suffolk County Community College (Environmental Science Program Suffolk County Community College Selden NY 11784). He is currently the chair of the Ecology Committee of the Pine Barrens Advisory Committee for Suffolk County and is a member of the Suffolk County Pine Barrens Review Commission. Black received a B.S. in chemistry from Adephi University an M.S. in public administration from the University at Stony Book an M. S. from Hofstra University and a Ph. D. from Adlephi in marine sciences.

Stiff diagram. arc a m.ltivariate m.thod of analysis used to describe the chem.cal state of ground water. The use of Stiff diagram. to describe m.lticonstituent contam.nation sites, such as landfills, has distinct advantages over single constituent analyses. Problem. associated with traditional Stiff diagram.analyses, such as diagram.attentuation, can be addressed by allowing the scale of the diagram.to vary with the ionic strength of the analyzed sam.le. The use of these sliding scale Stiff diagram. reveals the chem.cal slate of the ground water over wide ranges of constituent concentrations and thus allows for sensitive and sophisticated depictions of com.licated contam.nation sites in a fashion that is extrem.ly difficult to replicate with single constituent analyses. This approach has possible applications for understanding and tracing the m.xing and chem.cal changes in uncontam.nated settings. Copyright © 1995, Wiley Blackwell. All rights reserved

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