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Benchmarking simulation software for use in modeling postal operations

COMPUTERS & industrial engineering 1997年第3期32卷 607-625页

作者： Bard, JF Graduate Program in Operations Research & Industrial Engineering Department of Mechanical Engineering University of Texas Austin TX 78712-1063USA

This paper reports on the second component of a three phase study undertaken for the Canada Post Corporation (CPC) to evaluate and select a commercial simulation package to be used for operational and long-term planning. The formal evaluation process consisted of a hierarchical screening procedure to identify qualified candidates and the development of a comprehensive benchmark model to test each candidate. Of the 172 simulation packages listed in the Directory of Simulation, only three satisfied each of the CPC's highest priority requirements. Data, mail flows, and processing logic associated with operations at the Hamilton, Ontario plant were used to establish the benchmarks and validate the models. This project represents the first time full-scale models have been constructed in parallel to evaluate graphics-based simulation software. Although several economies of scale were realized, the differences in the three packages meant significant duplication. Nevertheless, the CPC felt that the parallel approach would return benefits in the long run and that it was necessary to arrive at a considered decision. A major aim of this paper is to highlight the methodology used in the analysis and to present the lessons learned from the project. (C) 1997 Elsevier Science Ltd.

关键词： Postal services

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AUTOMATED MODULAR FIXTURE PLANNING: ACCURACY, CLAMPING, AND ACCESSIBILITY ANALYSIS

AUTOMATED MODULAR FIXTURE PLANNING: ACCURACY, CLAMPING, AND ...

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ASME 1997 International mechanical engineering Congress and Exposition, IMECE 1997 - Manufacturing Science and engineering

作者： Wu, Yufeng Rong, Yiming Ma, Weidong LeClair, Steven R. Department of Mechanical and Industrial Engineering University of Illinois Urbana-Champaign United States Manufacturing Systems Program Southern Illinois University Carbondale United States Materials Directorate Wright Laboratory Wright-Patterson Air Force Base United States

ISBN: (纸本)9780791826799

Automated fixture design has become a research focus in process planning and CAD/CAM integration. An automated fixture configuration design system has been developed where when fixturing surfaces and points are specified, modular fixture components can be automatically selected and placed into position with satisfying assemble conditions. A geometric analysis has been conducted to determine the fixturing surfaces and points which provide feasible geometric constraints and assembly relationships with modular fixtures. This paper presents analyses on fixturing accuracy, clamp planning, fixturing accessibility, and clamping stability. When a fixture planning is determined, the analysis results can be applied to verify the performance of the fixture design. © 1997 American Society of mechanical Engineers (ASME). All rights reserved.

关键词： Fixtures (tooling)

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Input-to-state stability (ISS) analysis for dynamic neural networks

Input-to-state stability (ISS) analysis for dynamic neural n...

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International Conference on Neural Networks

作者： E.N. Sanchez J.P. Perez Cinvestav Unidad Guadalajara Guadalajara Jalisco Mexico Electrical Engineering Graduate Program School of Mechanical and Electrical Engineering Universidad Autonoma de Nuevo Leon San Nicolas de los Garza Mexico

This paper presents the input-to-state (ISS) analysis for dynamic neural networks. We determine, using a Lyapunov function, conditions to guarantee ISS; they also guarantee globally asymptotically stability.

关键词： Stability analysis Neural networks Lyapunov method Asymptotic stability Mathematical model Nonlinear systems Electronic mail Intelligent control Associative memory Pattern recognition

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Ship habitability - Preparing for the 21st century

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NAVAL ENGINEERS JOURNAL 1997年第6期109卷 21-27页

作者： Meere, EP Grieco, L Edward P. Meere:works in the Arrangements Division of the NavSea Systems Command (SEA 03H1) and has been the Navy Habitability Program Manager for the past three years. He received a Bachelor of Science in Engineering Science from Illinois Institute of Technology in 1966. He received a Masters of Business Administration from the American University in 1977. His experience to date includes: Mathematics teacher at Prince Georges Community College for 7 years 10 years as Branch Head for Carrier and Amphibious Arrangements Project Engineer for Underway Replenishment Equipment responsible for the concept and development of the One Man Control Station. Louis R. Grieco:is a Supervisory Mechanical Engineer in the Habitability Branch of the Hull and Deck Machinery Department at the Naval Surface Warfare Center Carderock Division Philadelphia where he has been employed since 1971. He received a Bachelor of Science in Mechanical Engineering degree from Drexel University in 1979. His experience to date includes trade design and combat systems assignments at Philadelphia Naval Shipyard from 1960 to 1971 In Service Engineering Section and Branch Head for cargo/ weapons elevators conveyors torpedo handling systems habitability equipment and underway replenishment equipment and Life Cycle Manager for habitability systems. He also serves as a member of the Industrial Advisory Board at Temple University Philadelphia PA.

This paper discusses the problems identified in a FY 1995 fleet habitability survey. The survey questioned the fleet on the quality of shipboard living and working conditions and identified shortfalls in berthing, sanitary spaces, and food service systems that influence crew morale, safety, and ultimately mission effectiveness. Existing habitability programs, new initiatives and responses to the survey problems, plus a few quality of life ideas for the 21st century, are outlined.

关键词： Warships

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Maintenance avoidance and maintenance reduction

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NAVAL ENGINEERS JOURNAL 1997年第1期109卷 47-56页

作者： Jacobs, KS McComas, JP Kenneth J. Jacobs:is director of the Naval Sea Systems Command's Surface Ship Maintenance Division (Sea 915). Originally trained as a data systems technician he attended Old Dominion University in Norfolk Virginia and graduated with a B.S degree in mechanical engineering in 1975. Over the course of the last twenty-one years Mr. Jacobs has served in NavSea as a project engineer for boats and service craft as the type desk for AFS AOR AO and AOG ship types and as manager of the Amphibious and Auxiliary Ship Maintenance Strategy Program where he was instrumental in the development and implementation of the Phased Maintenance Program. He has authored several papers on the subject of ship maintenance and is a member of Tau Beta Pi Engineering Honor Society ASNE and the Association of Scientists and Engineers. Jon P. McComas:is a 1967 graduate of the U.S. Naval Academy and a 1974 graduate of the Naval Postgraduate School where he earned an M.S. degree in mechanical engineering. He also completed the Executive Management Program at North-western University in 1988. During his twenty-eight year naval career he served in destroyers and was a qualified surface warfare officer. He was designated an engineering duty officer in 1977 and subsequently held a number of positions primarily in the area of fleet maintenance and modernization including ship superintendent and type desk officer at Philadelphia Naval Shipyard assistant maintenance officer on the staff of ComNav-SurfGru WestPac in Subic Bay Phillippines assistant program manager for steam-powered surface combatants (PMS 313) and for gas turbine-powered surface combatants (PMS 314) at Navsea and director Maintenance Policy Branch (OP 433) on the CNO staff. Following a tour as head of engineering duty assignments at BuPers his last active duty assignment was at NavSea as the program manager for surface ships (PMS 335) responsible for life cycle management of more than 300 surface ships in forty-three ship classes and direction of the Navy Ship Inactivation P

Maintenance is performed to restore a system's inherent reliability. However, reliability is not enough: a maintenance task must ''pay for itself'' in dollars or readiness. This applies to all types of maintenance: corrective, preventive, and alterative. We can reduce corrective maintenance costs through preventive and alterative maintenance. We can reduce preventive maintenance costs by eliminating inapplicable and ineffecitve tasks. We must weigh alterative maintenance costs against the value of improved readiness and cost-avoidance of future corrective maintenance. The U.S. Navy is improving alterative maintenance by engineering for reduced maintenance (ERM). This process corrects the root cause of some high-cost items by replacing the system, component, or coating with an improved design or material. It overcomes the limit of preventive maintenance: higher levels of inherent reliability require design improvement. The U.S. Navy is improving preventive maintenance through condition-based maintenance (CBM). The Navy's CBM initiative encompasses three parallel efforts: rules (improving maintenance requirements and plans), tools (using computer and diagnostic technology to facilitate maintenance decision-making), and schools (educating all levels of maintenance decision-makers in reliability and condition-based maintenance engineering principles). This paper addresses how the U.S. Navy surface ship community plans to avoid inapplicable and ineffective maintenance and reduce maintenance costs without sacrificing reliability.

关键词： Logistics

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Environmental compliance: Requirements and technology opportunities for future ships

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NAVAL ENGINEERS JOURNAL 1997年第3期109卷 349-369页

作者： Nickens, AD Pizzino, JF Crane, CH Anthony D. Nickens:is the research and development progrma a manager for the Navy's Environmental Protection Program at the Naval Sea Systems Command's Ship Research Development and Standards Group (Sea 03R).He is responsible for overseeing directing and funding the design and development of shipboard systems and precedures to assure compliance with maritime environmental laws and regulations He holds an M.B.A. degree from the Florida Institute of Technology an M.S. degree in chemical engineering from the University of Florida and a B.S. degree i chemical engineering magna cum laude from the North Carolina State University. In addition he successufully completed the twenty-week Program Management Course at the Defense Systems management College in Fort Belvoir Virginia and the Executive Program at the University of Virginia Darden Graduate School of Business. He is also an engineering duty officer in the Navy reserves and a previous author and frequent contributor to Naval Engineers Journal. Josepe F. Pizzino:is a Naval Surface Warfare Center Carderock Division Employee working at the Naval Sea Systems Command's Ship Research Development and Standards Group (Sea 03R). He is a research and development program manager for the Navy's Environment Protection Program responsible for overseeing directing and funding the design and development of shipboard systems and procedures to assure combliance with maritime environment laws and regulations. Prior to his present assignment he was project engineer for the development os shipboard and life-boat reverse osmosis desalination systems both of which are persently being unstalled aboard Navy ships. He holds a B.S. in chemical engineering from the University of Marland and an M.S. degree in chimical engineering from The Catholic Uhiversity of America. Chirstopher H. Crane:is a senior scientist at Geo-Centrs Inc. where he has provided technical program and dcumentation support for Navy headquarters shipboard environmental programs since 1989. Previouss grover

Navy ships must be able to operate anywhere in the world and visit any port unencumbered by environmental restrictions. The Office of the Chief of Naval Operations (OCNO) has formulated a vision for the environmentally sound ship of the 21st century, which will ensure compliance with environmental requirements applicable to Navy ships, while maintaining fleet effectiveness and readiness. Navy ships generate a variety of solid and liquid wastes and atmospheric emissions. Ships have limited capabilities for holding wastes for offload to shore. Working closely with the OCNO, the Naval Sea systems Command (NavSea) is developing systems, equipment, and procedures to process and manage ship wastes in an environmentally responsible manner. Several pieces of shipboard equipment have been successfully developed to process solid and liquid waste, hazardous materials and ozone-depleting substances (ODSs). The technologies and practices being developed under this program will: ensure compliance with environmental laws and regulations, significantly reduce the logistic burdens and costs associated with shoreside offload and disposal of ship wastes, implement Navy environmental and occupational safety and health policies, enhance the quality of life aboard ship, and continue the Navy's leadership role in protecting the marine environment.

关键词： Naval vessels

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Influence of human engineering on manning levels and human performance on ships

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NAVAL ENGINEERS JOURNAL 1997年第5期109卷 67-76页

作者： Anderson, DE Oberman, FR Malone, TB Baker, CC David E. Anderson:has a bachelor of science degree in environmental engineering from Florida Technological University and a master's degree in environmental engineering from the University of Central Florida. He is a graduate of the Naval Sea Systems Command's Engineer-In-Training (EIT) Program. Mr. Anderson was instrumental in introducing the collective protection system (CPS) in the U.S. Navy developing the initial forward-fit package for the USS Gunston Hall and the engineering change proposal (ECP) for the USS Wasp. In 1990 he joined the Human Systems Integration (HSI) Division (SEA 55W5) where he was task leader for auxiliary ships. He is currently the HSI manager for the future technology variant of the SeaLift ship and the future carrier. Association of Scientists and Engineers 33rdAnnual Technical Symposium 26 April 1996. Fred R. Oberman:has B.A. and M.A. degrees from the University of Chicago and Loyola University (experimental psychology) and an M.S. degree in industrial engineering and operations research from Virginia Polytechnic Institute (VPI). He has more than 30 years experience in HSI management planning research analysis design and testing in government and private sector positions. He is currently responsible for NavSea HSI generic research and tool development efforts. He is responsible for Human Engineering Specifications and Standards (Commercial Hypertext) and is the NavSea 03D7 representative on HSI in Performance Specifications and for integration of HSI within Integrated Logistic Support (ILS). He has served as DoD HSI SubTAG chair and member of the Simulation and Modeling Test and Evaluation Display and Control Systems Human Computer Interaction Specifications and Standards and Systems Design Sub Tags as a member of the Society of Naval Architects and Marine Engineers (SNAME) Systems Safety Panel and a member of NATO RSG 14 on man-machine analysis. Thomas B. Malone: CHFEP received a Ph.D. in experimental psychology from Fordham University in 1964. He is president of Carlow

The objectives of Human engineering (HE) are generally viewed as increasing human performance, reducing human error, enhancing personnel and equipment safety, and reducing training and related personnel costs. There are other benefits that are thoroughly consistent with the direction of the Navy of the future, chief among these is reduction of required numbers of personnel to operate and maintain Navy ships. The Naval Research Advisory Committee (NRAC) report on Man-Machine Technology in the Navy estimated that one of the benefits from increased application of man-machine technology to Navy ship design is personnel reduction as well as improving system availability, effectiveness, and safety The objective of this paper is to discuss aspects of the human engineering design of ships and systems that affect manning requirements, and impact human-performance and safety The paper will also discuss how the application of human engineering leads to improved performance, and crew safety, and reduced workload, all of which influence manning levels. Finally, the paper presents a discussion of tools and case studies of good human engineering design practices which reduce manning.

关键词： Human engineering

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A column generation procedure for gang-rip saw arbor design and scheduling

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INTERNATIONAL JOURNAL OF PRODUCTION RESEARCH 1996年第2期34卷 313-327页

作者： Fathi, Y Kegler, SR Culbreth, CT Department of Industrial Engineering North Carolina State University Box 7906 Raleigh NC 27695-7906Graduate Program in Operations Research North Carolina State University Raleigh NC 27695-7913 Department of Industrial Engineering North Carolina State University Box 7906 Raleigh NC 27695-7906

We present a mathematical model for scheduling a computer assisted gang-rip saw system. Such systems are typically used within the furniture manufacturing industry for processing (ripping) lumber. This model uses the concept of column generation of linear programming to design appropriate saw arbors, and to select a set of arbors with their corresponding run time, in order to process a given stream of incoming lumber according to a demand schedule for finished cut widths. Results of a limited computational experiment with this model are discussed.

关键词： LINEAR programming MANUFACTURING processes

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The Regional Deterrence Ship (RDS 2010) - A design for littoral warfare in the 2010 timeframe

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NAVAL ENGINEERS JOURNAL 1996年第1期108卷 61-72页

作者： Calvano, CN Riedel, JS Professor Charles N. Calvano Capt. USN (Ret.): of the Naval Postgraduate School is responsible for a program in Total Ship Systems Engineering. He is a graduate of the Naval Academy who served as a surface warfare officer. After completion of his graduate education at MIT he became an Engineering Duty Officer and served at Boston Naval Shipyard in several capacities. He was the Repair Facilities Advisor to the Vietnamese Navy the Project Officer for construction of nuclear powered guided missile cruisers (CGNs) at the Supervisor of Shipbuilding Newport News Virginia and served on the staff of the Commander Naval Surface Forces U.S. Atlantic Fleet and later at the Supervisor of Shipbuilding in Portsmouth Virginia in maintenance and overhaul management positions. He was Officer in Charge of the Annapolis Laboratory of the David Taylor Research Center and Commanding Officer of the Engineering Duty Officer School. He retired from active duty in October 1991 after serving in the Naval Sea Systems Command as the Director of the Ship Design Group and of the Advanced Concepts and Technology Group. Lt. Jeffrey S. Riedel USN:is an Engineering Duty Officer currently assigned to the Supervisor of Shipbuilding Bath Maine. He obtained his B.S. degree in Marine Engineering from Maine Maritime Academy in 1986 and his M.S. degree in Mechanical Engineering plus a Mechanical Engineer's degree from the Naval Postgraduate School in 1993. Lt. Riedel's naval career has included duty aboaqrd USS Wainwright (CG 28) as auxiliaries officer damage control assistant and main machinery officer. Currently he serves as the assistant production officer at SUPSHIP Bath in charge of DDG 51 class construction and delivery.

This paper describes the design of a Regional Deterrence Ship (RDS 2010) for the 2010 timeframe. The requirements for the design were for a ship to operate in littoral areas of the world with a mission of deterring regional conflicts and of hampering the efforts of the aggressor in such a conflict. In addition the ship's mission included the evacuation of friendly personnel as hostilities become likely. The problem countering the littoral threat during times of constrained budgets is addressed. Top level requirements for the design, generated in parallel with ''.... From the Sea'' [1], were used to set the design goals. The paper describes the manner in which littoral warfare changes the nature of the challenges faced by Navy surface combatants, including a ship such as the RDS 2010. A number of factors become more crucial design concerns than for blue water ships, including reduced reaction times, likelihood of attack from hidden land sites, shallow water mines and shallow water USW Certain other factors become less critical in littoral areas and this also has ship design impacts. While some present ship designs can perform some of the tasks needed in a littoral warfare/regional conflict environment, none represents a completely integrated design (hull, mechanical & electrical;combat systems;fiscal and manning constraints;reduced vulnerability;robust self-defense etc.) for a vessel stationed in waters that, without warning, can become hostile. After describing the mission requirements to which the RDS 2010 was designed, the paper discusses the controlling design philosophy and decisions and describes the process used to assess threats to the ship. The process of combat system selection, against the backdrop of expected threat scenarios, is described and the intended approach to integration of the combat system is discussed. In recognition that decreased reaction times and surprise attacks are likely to threaten a ship engaged in regional deterrence, discussions oi

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Optimal design of an inter-board strain-relief for high-reliability surface mount attachment

Optimal design of an inter-board strain-relief for high-reli...

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Electronic Components and Technology Conference (ECTC)

作者： R.W. Kotlowitz K.L. Terrell Network Wireless Systems Business Unit AT and T Bell Laboratories Whippany NJ USA Graduate Program in Mechanical Engineering New Jersey Institute of Technology Newark NJ USA

The long-term reliability of surface mount (SM) interconnections remains an important issue in many electronics packaging technologies. Strain-reliefs with sufficient compliance can minimize the cyclic loads impressed on SM solder connections during operational temperature excursions, appreciably increasing the margin for long-term attachment reliability. Compliance evaluation was performed for an inter-board strain-relief, or bond-strap, in a commercial Low-Noise Amplifier (LNA) used in various AT&T wireless transmission systems. The bond-strap compliance was optimized, within practical forming and assembly constraints, to provide robust SM interconnection during the expected product service life.

关键词： Samarium Bonding Electronics packaging Surface-mount technology Temperature Performance evaluation Low-noise amplifiers Constraint optimization Assembly Robustness

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