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Incomplete Cholesky Preconditioners with Band-Diagonalization for Sparse Symmetric systems

Applied Numerical Analysis & Computational Mathematics 2004年第2期1卷

作者： Taku Itoh Daichi Fujimoto Takashi Kitagawa Susumu Nakata Graduate School of Systems and Information Engineering University of Tsukuba Tsukuba Ibaraki 305-8573 Japan Master's Program in Science and Engineering University of Tsukuba Tsukuba Ibaraki 305-8573 Japan Phone: +81 29 853 5018 Fax: +81 29 Phone: +81 29 853 5345 Fax: +81 29 853 5345 College of Information Science and Engineering Ritsumeikan University Kusatsu Shiga 525-8577 Japan Phone: +81 77 561 5062 Fax: +81 77 561 5203

In this paper, we present a preconditioning method based on Incomplete Cholesky Decomposition (ICD) combined with a band-diagonalization strategy which enables an efficient ICD. The performance of the ICD preconditioner for sparse symmetric systems has a close relationship to the number of fill-ins of the exact Cholesky decomposition and the number can be decreased by the band-diagonalization. We consider an implicit surface reconstruction as a typical problem which has a property that the coefficient matrix can be transformed into a band-diagonal structure at a low computational cost. The effectiveness of the preconditioning is shown as a result of some numerical experiments. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

关键词： Krylov subspace iterative methods incomplete Cholesky preconditioners band-diagonalization sparse symmetric systems surface reconstruction problem

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Effectiveness of human evaluation and human load in acquisition of intelligible fuzzy rules

Effectiveness of human evaluation and human load in acquisit...

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SICE 2003 Annual Conference, SICE 2003

作者： Onisawa, Takehisa Fujihara, Yoshitaka Institute of Engineering Mechanics and Systems University of Tsukuba 1-1-1 Tennodai Tsukuba305-8573 Japan Master's Program in Science and Engineering Onisawa Lab. Institute of Engineering Mechanics and Systems University of Tsukuba 1-1-1 Tennodai Tsukuba305-8573 Japan

ISBN: (纸本)0780383524

Ths pap r discusses the effectiveness of hu an evaluation in the acquisition of fuzzy rules that are proper for situations and intelligible to human. Interactive Genetic Algorithm (Interactive GA) is used for the rules acquisition. Taking car control for running through cran-typed courses as an example, acquired fuzzy rules with human evaluation ad those without human evaluation are eompared with eaeh other. This paper also discusses human load in the evaluation of acquired fuzzy rules. © 2003 SICE.

关键词： Fuzzy rules

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Monitoring the navy's strategic reserve of ozone-depleting substances

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NAVAL ENGINEERS JOURNAL 2002年第4期114卷 95-104页

作者： Smith, DE Breslin, DA Toms, GS Norton, P DENNIS E. SMITH PH.D. is currently a statistical consultant for GEO-CENTERS INC. He received a B.A. in Mathematics (magna cum laude)from Wabash College and an M.S. in mathematics an M.S. in statistics and a Ph.D. in statistics from the University of Wisconsin. From November 1973 until February 1999 he was president and principal statistician at Desmatics Inc. where he participated in a number of studies involving the application of statistical methods to various technical problems in the Navy's environmental-protection and auxiliary-machinery programs. Dr. Smith was instrumental in developing the statistical procedures underlying the Navy's ODS reserve monitoring plan. DAVID A. BRESLIN P.E. is the director of technical operations for the Naval Surface Warfare Center and chairs the ASNE/SNAME Joint Committee on Environmental Engineering. He received a master of science in aerospace engineering from Virginia Tech a master of engineering administration in industrial and systems engineering from Virginia Tech and a bachelor of engineering in mechanical engineering from Stevens Institute of Technology. From 1993 to 1997 he was the program manager of the Naval Sea Systems Command's CFC and Halon Elimination Program and played a critical role in establishing the Navy's strategic reserve of ozone-depleting substances. Because of his many efforts he received a Stratospheric Ozone Protection Award in 1995 from the U.S. Environmental Protection Agency in recognition of “exceptional contributions to global environmental protection”. GREGORY S. TOMS P.E. is the CFC &Halon Elimination Program Manager for the Naval Sea Systems Command (NAVSEA). He received a master of science degree in mechanical engineering from the University of Maryland and a B.S. degree in mechanical engineering from West Virginia University. From 1984 to 1997 he was employed at the Naval Surface Warfare Center Carderock Division Annapolis Detachment (formerly David Taylor Research Center)where he worked on the development of advanced cent

The domestic production of the most powerful ozone-depleting substances (ODSs) has permanently ceased and the abundant supplies of a number of refrigerants, fire-fighting agents, and solvents, once taken for granted, are now a thing of the past. The Navy has adopted a successful strategy for addressing the threat posed by the unavailability of ODSs. That strategy includes relying on a strategic reserve of ODSs. Considering that the strategic reserve will play a critical role in sustained Fleet operations into the middle of the century, it is important to record the history of the reserve and to document lessons learned in order to educate future generations that may face similar challenges. This is the third of three papers that cover all aspects of the Navy's strategic reserve of ODSs. Breslin (1999) documented the history of the Navy's effort to size, establish, and monitor a reserve designed to support Fleet operations until the middle of the century. Breslin, Smith, and Toms (2000) addressed in detail the process used to estimate the required size of the reserve, including the survey method, statistical analyses, and sizing algorithms. This paper discusses the Navy's plan for monitoring the Navy's strategic reserves of ODSs and describes the methods used in the monitoring process. In particular it discusses the underlying assumptions and statistical techniques associated with the Navy's prediction of the expected drawdown of the reserves. A comparison of actual data, collected since the strategic reserves began operations in 1995, with the predicted reserve drawdown, is included in the paper.

关键词： Marine engineering

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A statistical method for estimating the life expectancy of certain shipboard equipment

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NAVAL ENGINEERS JOURNAL 2002年第1期114卷 27-32页

作者： Smith, DE Breslin, DA Toms, GS DENNIS E. SMITH PH.D. is a statistical consultant for Geo-Centers Inc. He received a B.A. in mathe-matics (magna cum laude) from Wabash College and an M.S. in mathematics an M.S. in statistics and a Ph.D. in statistics from the University of Wisconsin. From November 1973 until February 1999 he was President and Principal Statistician at Desmatics Inc. where he participated in a number of studies involving the application of statistical methods to various technical problems in the Navy's environmental-protection and auxiliary-machinery programs. Dr. Smith was instrumental in developing the statistical procedures underlying the Navy's ODS reserve monitoring plan. DAVID A. BRESLIN P.E. is the Director of Technical Operations for the Naval Surface Warfare Center and is the chairperson of ASNE's Committee on Environmental Engineering. He received a master of science degree in aerospace engineering from Virginia Tech a master of engineering administration in indus-trial & systems engineering from Virginia Tech and a bachelor of engineering in mechanical engineering from Stevens Institute of Technology. From 1993 to 1997 he was the program manager of the Naval Sea Systems Command's CFC & Halon Elimination Program and played a critical role in establishing the Navy's strategic reserve of ozone-depleting substances. Because of his many efforts he received a Stratospheric Ozone Protection Award in 1995 from the U.S. Environmental Protection Agency in recogni-tion of “exceptional contributions to global environmental protection”. GREGORY S. TOMS P.E. is the CFC & Halon Elimination Program Manager for the Naval Sea Systems Command (NAVSEA). He received a master of science degree in mechanical engineering from the University of Maryland and a B.S. degree in mechanical engineering from West Virginia University. From 1984 to 1997 he was employed at the Naval Surface Warfare Center Carderock Division Annapolis Detachment (formerly David Taylor Research Center) where he worked on the development of advanced cent

This paper reviews an inexpensive statistical-sampling methodology that can be used to determine the attrition rates of certain types of shipboard equipment. The methodology relies on surveys that are conducted in conjunction with regularly scheduled ship visits over a period of time and a statistical analysis of the survey results. The statistical technique allows for reasonably accurate estimates to be made of attrition rates. The specific example cited in this paper is related to galley-type refrigeration equipment, such as salad chillers, beverage dispensers, et cetera. In the case of galley-type refrigeration equipment, the Navy needs to know whether the Fleet's inventory of equipment relying on Class I Ozone-Depleting Substances (ODSs) will be replaced through natural attrition by the end of fiscal year (FY) 2005, at which time supplies of ODS-based refrigerants will no longer be available for use by ship galleys. This paper outlines the process used to gather data, the analysis of the data, and concludes that the Navy's inventory of galley equipment using Class I ODSs will be replaced through natural attrition by the end of FY05. The methodology reviewed by this paper has wider applications. For various types of shipboard equipment, the methodology can also be used to estimate with reasonable accuracy life expectancies, configurations, conditions, and other items of interest.

关键词： Ship equipment

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An evolutionary kernel-based reasoning system using reconfigurable VLSIs: its hardware prototyping and application to the splicing boundary problem

An evolutionary kernel-based reasoning system using reconfig...

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Congress on Evolutionary Computation

作者： M. Yasunaga K. Ushiyama N. Aibe H. Fujiwara I. Yoshiyara J.H. Kim Institute of Information Sciences and Electronics University of Tsukuba Tsukuba Ibaraki Japan Master Program of Science and Engineering University of Tsukuba Tsukuba Ibaraki Japan College of Sciences University of Tsukuba Tsukuba Ibaraki Japan Faculty of Engineering Miyazaki University Miyazaki Japan Systems Engineering Department University of Arkansas Little Rock Little Rock AR USA

We propose a novel reasoning algorithm SKBR (symbolical kernel-bases reasoning) that is an extension of the conventional pattern recognition algorithm KB (kernel based method) to the symbolical recognition, or reasoning. We apply SKMR to the splicing boundary prediction problem in human and other species DNA data, and show a new rule extracted from the splice site boundary. We also develop a SKBR hardware system using FPGA and memory LSIs. Performance evaluation of the system shows its very short reasoning time of less than 100 micro-second/query.

关键词： Very large scale integration Hardware Prototypes Pattern recognition Kernel Genomics Bioinformatics Informatics Splicing DNA

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Evolutionary control method and swing up and stabilization control of inverted pendulum

Evolutionary control method and swing up and stabilization c...

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Conference of the North American Fuzzy Information Processing Society - NAFIPS

作者： S. Yasunobu H. Yamasaki Institute of Engineering Mechanics and Systems University of Tsukuba Tsukuba Japan Master's program in Science and Engineering University of Tsukuba Tsukuba Japan

The control of a nonlinear system where the characteristics are changing is difficult. In order to control the system, a study is needed to model during the execution and control. In this paper, a new evolutionary control method is proposed that combines the evolutionary modeling by on-line GA and predictive fuzzy control. This control method is applied to the control of inverted pendulum where characteristics are modified actively to the external factor. The effectiveness of this control method has been confirmed.

关键词： Control systems Humans Fuzzy control Nonlinear control systems Nonlinear systems Predictive models Fuzzy sets Control system synthesis Fuzzy systems systems engineering and theory

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Stress Relaxation Behavior of Angle-Ply CFRP Laminate at Elevated Temperature

Stress Relaxation Behavior of Angle-Ply CFRP Laminate at Ele...

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第十三届国际复合材料会议

作者： M.Kawai Y.Masuko T.Kazama Institute of Engineering Mechanics and Systems University of Tsukuba Tsukuba 305-8573 JAPAN Graduate School of Systems and Information Engineering University of Tsukuba Master's Program in Science and Engineering University of Tsukuba

Introduction Polymers exhibit larger elongation and more significant rate- and time-dependent behavior at higher temperature [1]. To understand properties of polymer matrix composites and to correctly evaluate their performance characteristics, therefore, it is one of the most important issues to elucidate the time- and rate-dependent nonlinear behavior of polymer matrix composites at elevated temperature. The objective of the present study is to elucidate characteristics of the short-term stress relaxation behavior of angle-ply CFRP laminates at high temperature. The stress relaxation curves for various angle-ply laminates are presented. By the normalization with respect to the maximum stress at the beginning of each relaxation test, we obtain a master relaxation curve that is characterized by the off-axis time-dependent response of constituent unidirectional plies.

关键词： stress relaxation, angle-ply laminate, high-temperature, carbon fiber, epoxy

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Survey of reduced workload and crewing strategies for ocean patrol vessels

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NAVAL ENGINEERS JOURNAL 2001年第2期113卷 29-44页

作者： Baker, C Krull, R Snyder, G Lincoln, W Malone, TB Clifford C. Baker CIE CHFEP is a senior staff scientist at Carlow International Incorporated. He has applied most of his 24 years of experience in the application of human engineering technology to maritime systems. Mr. Baker has directed much of Carlow's efforts to reduce ship workload and to improve human performance and maritime safety through application of human factors methods and data. He is a Certified Industrial Ergonomist (CIE) as well as a Certified Human Factors Engineering Professional (CHFEP). Both certifications were granted by Oxford Research where Mr. Baker also serves as an Advisory Board member. Russell D. Krull P.E. is a senior engineer with A&T/Proteus Engineering with more than 18 years of experi-ence in marine engineering naval architecture and program management including 16 years of active duty in the U.S. Coast Guard. Recent experience includes advanced ship design studies engineering software development technical support for the USMC Advanced Amphibious Assault Vehicle propulsion systems analyses ship structural engineering and cargo handling systems engineering. Mr. Krull has an M.S.E. in naval architecture and marine engineering and an M.S.E. in industrial and operations engineering from University of Michigan and a B.S. in ocean engineering from the U.S. Coast Guard Academy. Capt. Glenn L. Snyder USCG. Regrettably since this paper was originally written Capt. Snyder has passed away. At the time of his death he was an operations specialist assigned to the Coast Guard's Deepwater Capabilities Replacement Project as Chief of Human Systems Integration. He served as commanding officer of the patrol boat Cape George (WPB-95306) the icebreaking tug Biscayne Bay (WTGB-104) and the cutter Legare (WMEC-911). A 1975 graduate of the U.S. Coast Guard Academy Capt. Snyder held an M.A. in national security and strategic studies from the U.S. Naval War College and an M.A. in international relations from Salve Regina College. In addition he was a 1998 fellow of the Foreign Service

The U.S. Coast Guard is in the concept exploration phase of its Integrated Deepwater System (IDS) acquisition project. This project will define the next generation of surface, air and command, control, communications, computers, intelligence, surveillance, and reconnaissance (C4ISR) assets used to perform the Coast Guard's missions in the IDS environment (>50 NM off the U. S. coastline). As part of early technology investigations, the needs exist to: (1) analyze the workload requirements of the IDS, (2) identify alternative means to perform ship's work, and (3) optimize ship manning consistent with ship workload, performance criteria, and the available tools and equipment aboard. To reduce shipboard work requires an understanding of the mission and support requirements placed on the vessel and crew, how these requirements are currently met, and how requirements might otherwise be met to reduce workload and crew size. This study examined currently implemented workload and manpower reducing approaches of commercial maritime fleets, U.S. and foreign navies, and foreign coastguards. These approaches were analyzed according to evaluation criteria approved by the IDS acquisition project team. From this, strategies for shipboard work reduction that may be considered for adoption by the IDS were identified and analyzed according to performance and costs factors. Ten workload-reducing strategies were identified: damage control, bridge, multiple crewing, engineering, risk acceptance, modularity, deck, enabling technologies, ship/personnel readiness, and operability and maintainability.

关键词： Naval vessels

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Utilization of root cause failure analysis in the investigation of marine deck fitting failures

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NAVAL ENGINEERS JOURNAL 2001年第1期113卷 93-99页

作者： Huff, DS Lynaugh, KM David S. Huff graduated from the University of Maryland with a B.S.M.E. in 1972 and a M.S. in technology management in 1995. Prior to government service he worked for Newport News Shipbuilding as a fluid systems engineer and for Gibbs & Cox as a project engineer. Mr. Huff entered government service in 1977 with the Military Sealift Command Engineering Operations Division then as a construction representative and finally as deputy director ship design and construction. He then moved to NAVSEA in 1989 as assistant project manager on the conversion of AO-177 oilers to AO (JUMBO). From 1993 through 2000 he was assistant project manager for the construction of T-AKR-300 Class of Strategic Sealift RO/RO ships at Avondale. Currently Mr. Huff is manager of the Advanced Projects Group within the PEO EXW Auxiliary Boats and Crafts Program Office. Kevin M. Lynaugh obtained his naval architecture and marine engineering degree from University of California Berkeley in 1984. He obtained his Master's degree in science and engineering from The Johns Hopkins University in 1997 with a dual major in program management and operations management. He has been with NAVSEA Naval Surface Warfare Center Carderock Division for over 16 years. He spent four years with the Hydromechanics Division computerizing the Model Design Group two years with the Large Cavitation Channel Project as a project engineer six years with the Ship Building Technologies Department as a task area manager managing research programs the past 3 ½ years with the Strategic Sealift Program as the ship design manager for Avondale's new con-struction and as the deputy assistant program manager for post delivery and NASSCO's new construction. Currently Mr. Lynaugh is the on-site ship design manager for LHD-8 at Ingalls Shipyard in Pascagoula Mississippi.

Cracking was discovered in the openings of cargo deck tie down fittings on ships under construction. There was a distinct possibility that these cracks could propagate through the fittings and into the strength deck plating, affecting the ships hull integrity. With more than 14,000 fittings installed on each ship, the appearance of approximately 400 cracks at the mid-ship area of the main and lower decks raised production and operational concerns. This paper will discus the successful application of a Root Cause Failure Analysis (RCFA) methodology employed by a Corrective Action Team (CAT) establish to solve the problem. Through their efforts and the systematic application of RCFA, various failure hypotheses were validated or discounted and consensus was achieved on the appropriate corrective action.

关键词： Marine engineering

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Composition of melody reflecting user's feeling

Composition of melody reflecting user's feeling

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作者： Onisawa, T. Takizawa, W. Unehara, M. Institute of Engineering Mechanics and Systems University of Tsukuba Japan College of Systems Engineering Onisawa Lab. Institute of Engineering Mechanics and Systems University of Tsukuba Japan Master's Program in Science and Engineering Onisawa Lab. Institute of Engineering Mechanics and Systems University of Tsukuba 1-1-1 Tennodai Tsukuba305-8573 Japan

This paper mentions an approach which composes melodies reflecting user's feelings by interactive genetic algorithms. One melody corresponds to a chromosome containing the information such as tone color, tune, the number of notes and the length of notes. Melodies are composed by the use of GA operations. A user listens to presented melodies and evaluates them whether they fit with his/her image of the melody or not. This evaluation process is performed not by objective fitness functions but by humans. Therefore, this approach uses the interactive GA. The chromosome with the best evaluation is chosen as an elite. Elite characteristics are inherited to chromosomes in the next generation. These procedures are repeated until the user finds a melody fitting with the image of the melody. Experiments are carried out in order to confirm the usefulness of the presented approach. The experimental results show that the presented approach composes melodies reflecting user's feelings. © 2000 IEEE.

关键词： Chromosomes

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