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European Grid Conference on Advances in Grid Computing - EGC 2005

作者： Hoekstra, Alfons G. Sloot, Peter M. A. Systems Architecture and Programming Faculty of Science University of Amsterdam Kruislaan 403 1098 SJ Amsterdam Netherlands

We introduce the concept of Grid Speedup as a scalability metric for parallel applications on the grid and analyze it theoretically. It is shown that classes of applications exist for which good grid speedups can be expected. The class of stencil-based applications is taken as an example. The Grid computing community is challenged to demonstrate large grid speedups on real Grid computing environments. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Parallel processing systems

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Characterization and analysis of HMMER and SVM-RFE parallel bioinformatics applications

Characterization and analysis of HMMER and SVM-RFE parallel ...

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IEEE International Workshop/Symposium on Workload Characterization

作者： U. Srinivasan Peng-Sheng Chen Qian Diao Chu-Cheow Lim E. Li Yongjian Chen R. Ju Yimin Zhang Programming Systems Laboratoryoratory Microprocessor Technology Laboratory Intel Corporation Santa Clara CA USA Architecture Research Laboratoryoratory Microprocessor Technology Laboratory Intel Corporation Santa Clara CA USA

Bioinformatics applications constitute an emerging data-intensive, high-performance computing (HPC) domain. While there is much research on algorithmic improvements, (2004), the actual performance of an application also depends on how well the program maps to the target hardware. This paper presents a performance study of two parallel bioinformatics applications HMMER (sequence alignment) and SVM-RFE (gene expression analysis), on Intel x86 based hyperthread-capable (2002) shared-memory multiprocessor systems. The performance characteristics varied according to the application and target hardware characteristics. For instance, HMMER is compute intensive and showed better scalability on a 3.0 GHz system versus a 2.2 GHz system. However, SVM-RFE is memory intensive and showed better absolute performance on the 2.2 GHz machine which has better memory bandwidth. The performance is also impacted by processor features, e.g. hyperthreading (HT) (2002) and prefetching. With HMMER we could obtain -75% of the performance with HT enabled with respect to doubling the number of CPUs. While load balancing optimizations can provide speedup of -30% for HMMER on a hyperthreading-enabled system, the load balancing has to adapt to the target number of processors and threads. SVM-RFE benefits differently from the same load-balancing and thread scheduling tuning. We conclude that compiler and runtime optimizations play an important role to achieve the best performance for a given bioinformatics algorithm.

关键词： Hidden Markov models Bioinformatics Hardware Load management Yarn Gene expression Performance analysis Multiprocessing systems Scalability Bandwidth

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Preface

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2004年 2981卷 V-VI页

作者： Müller-Schloer, Christian Ungerer, Theo Bauer, Bernhard University of Hannover Institute of Systems Engineering System and Computer Architecture - SRA Appelstr. 4 Hannover Germany University of Augsburg Institute of Informatics Augsburg Germany University of Augsburg Department of Software Engineering and Programming Languages Augsburg Germany

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Lattice boltzmann, A robust and accurate solver for interactive computational hemodynamics

Lattice boltzmann, A robust and accurate solver for interact...

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International Conference on Computational Science, ICCS 2003

作者： Artoli, A.M. Kandhaiy, D. Hoefsloot, H.C.J. Hoekstra, A.G. Sloot, P.M.A. Section Computational Science Laboratory for Computing Systems Architecture and Programming Faculty of Science University of Amsterdam Kruislaan 403 Amsterdam1098 SJ Netherlands Kramers Laboratorium voor Fysische Technologie Faculty of Applied Sciences Delft Netherlands Department of Chemical Engineering Faculty of Science University of Amsterdam Amsterdam Netherlands

ISBN: (纸本)9783540448600

Surgical planning as a treatment for vascular diseases re- quires fast blood ow simulations that are eÆcient in handling changing geometry. It is, for example, necessary to try diþerent paths of a planned bypass and study the resulting hemodynamic ow ýelds before decid- ing the ýnal geometrical solution. With the aid of a real time interactive simulation environment that uses an eÆcient ow solver, this allows ex- ible treatment planning. In this article, we demonstrate that the lattice Boltzmann method can be an alternative robust CFD technique for such kind of applications. Steady ow in a 2D symmetric bifurcation is studied and the obtained ow ýelds and stress tensor components are compared to those obtained by a Navier-Stokes (NS) solver. We also demonstrate that the method is fully adaptive to interactively changing geometry. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Geometry

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ADAM: Adaptive autonomous machine 1

ADAM: Adaptive autonomous machine

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1st Euromicro Workshop on Advanced Mobile Robots, EUROBOT 1996

作者： Van Oosten, Daan C. Nijenhuis, Lucas F.J. Bakkers, Andre W.P. Vervoort, Wiek A. Dutch Open University P.O. Box 2960 Heerlen6401 DL Netherlands Control Laboratory University of Twente Electrical Engineering Faculty P.O.Box 217 Enschede7500 AE Netherlands Systems Programming and Architecture University of Twente Informatics Department P.O.Box 217 Enschede7500 AE Netherlands

ISBN: (纸本)0818676957

This paper describes a part of the development of an adaptive autonomous machine that is able to move in an unknown world extract knowledge out of the perceived data, has the possibility to reason, and finally has the capability to exchange experiences and knowledge with other agents. The agent is not pre-programmed by its designer but was given simple rules of life, i.e. what is good and what is bad. By evaluating its sensor inputs these rules of life were transformed into a rule based reactive system. Simulations of the system showed that the agent is able to learn by its own experience. By representing the learned knowledge in an appropriate way, the acquired knowledge could be judged on its effectiveness and also this knowledge could be shared with other, less experienced agents. © 1996 IEEE.

关键词： Knowledge management

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ADAM: adaptive autonomous machine

ADAM: adaptive autonomous machine

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Euromicro Workshop on Advanced Mobile Robot

作者： D.C. van Oosten L.F.J. Nijenhuis A.W.P. Bakkers W.A. Vervoort Dutch Open University Heerlen Netherlands Electrical Engineering Faculty Control Laboratory University of Twente Enschede Netherlands Informatics Department Systems Programming and Architecture University of Twente Enschede Netherlands

关键词： Sensor systems Laboratories Electronic mail Informatics Data mining Artificial intelligence Humans Robot sensing systems Filters Actuators

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COMBAT SYSTEM ENGINEERING - A RETURN TO FUNDAMENTALS

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NAVAL ENGINEERS JOURNAL 1993年第3期105卷 61-69页

作者： MITTURA, A KARP, MS PE Andrew Mittura:is currently a senior program engineer with SYSCON Corp. He began his career in the Combat System Installation and Integration Office of NavSea in 1978. He has worked as a system engineer on the Seafire program at NSWCDD on the NATO Anti-air Warfare Program while at FMC Corporation and for the past four years on the Aegis Combat System with SYSCON. Current efforts include performance assessment studies of the Aegis combat system and combat system architecture and connectivity analysis. Mr. Mittura received a B.S. in electrical engineering from Penn State University in 1978 and an M.S. in engineering management from Catholic University of America in 1982. He is a licensed professional engineer with the State of Virginia. Mitchel S. Karp:cofounded K&K Software Engineering Inc. in February 1970. He is currently secretary/treasurer and senior system engineer. His involvement in combat systems began with NTDS in 1963. He has been involved in the Aegis Program since 1968 and has worked in all aspects of combat system development including computer programming tactical analysis software development and management. He has given several seminars on real-time software development and documentation. He currently is working under contracts to NSWCDD in the areas of combat system architecture and connectivity configuration management and documentation. Mr. Karp received a B.S. in engineering physics from Lehigh University in 1958.

The Navy's focus has shifted from global war scenarios to preparedness for the prospect of involvement in regional, littoral contingencies and conflicts. Operationally, shipboard personnel will need the ability to shift focus from the combat system multimission roles to that of only a single mission. From a development perspective, combat systems must accommodate a continual infusion of technology in a budget constrained environment. Combat system architecture is the single most important feature affecting combat system flexibility, from both an operational and developmental aspect. There is a fundamental partitioning of combat svstem functions into detect, command, and engage in a horizontal integration approach that enhances this needed flexibilitv. This fundamental partitioning is currently applied to individual weapon systems, but not to combat svstems as a whole. Instead, self-contained weapon systems are often developed and then vertically integrated to form a combat svstem, causing reduced flexibility. The battle organization is the principal driving requirement for combat system architecture. This paper shows that that the battle organization is best supported by a horizontally integrated combat system of detect, command, and engage. It concludes that a horizontally integrated combat svstem architecture of detect, command, and engage should be a candidate for future combat systems.

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Representation and execution support for reliable robot applications

Representation and execution support for reliable robot appl...

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Reliable Distributed systems

作者： P.S. Gopinath D.M. Lyons S. Mehta Computer Architecture and Programming Systems Department North American Philips Corporation Briarcliff Manor NY USA Autonomous Systems Department Philips Laboratories North American Philips Corporation Briarcliff Manor NY USA

ISBN: (纸本)0818620811

Robot applications, represented as plans, are used to outline a viewpoint that robustness needs to be emphasized in two areas: in the plan representation and in the underlying system software. Robot applications are inherently distributed, since the hardware usually comprises a set of independent actuators and sensors, with the robot programs acting as links between them. A special model of distributed computation, the RS (Robot Schemas) model, has been designed to handle the issues of robot plan representation, and an overview of the model is presented. An initial implementation of the model with minimal execution support demonstrated that the domain-dependent aspect of robustness on its own was not sufficient for robust behavior. Consequently, the OS has been augmented with real-time scheduling, and monitoring facilities.< >

关键词： Robustness Robot sensing systems Robotics and automation Application software Monitoring Timing Real time systems Human robot interaction Robot programming Laboratories

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Robust representation and execution of robot plans

Robust representation and execution of robot plans

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Euromicro Workshop on Real Time

作者： D.M. Lyons S. Mehta P.S. Gopinath North American Philips Corp. Briarcliff Manor NY USA Autonomous Systems Department Philips Laboratories North American Philips Corporation Briarcliff Manor NY USA Computer Architecture and Programming Systems Department Philips Laboratories North American Philips Corporation Briarcliff Manor NY USA

The construction of real-time software for autonomous robot systems that can operate in an uncertain and dynamic environment is considered. Techniques for representing robust robot plans using the RS (robot schema) model are developed which make it possible to separate planned decision-making from error monitoring; they give a modular way to embed error detection, diagnosis, and recovery into plans, and via the formal tools of RS they allow one to analyze plans for error behavior. However, experience in implementing the RS kernel leads to the conclusion that robustness in the plan representation alone is not sufficient. Robustness must also be incorporated in the underlying system software to complement robustness in the plan representation model. Experiences with the initial implementation of the RS execution environment kernel also emphasized the need for operating system constructs that would support the robustness inherent in the model.< >

关键词： Robustness Robotics and automation Monitoring Timing Humans Testing Semiconductor device modeling Computer architecture Robot programming Laboratories

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Control of ship fouling in U.S. Navy

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Naval Engineers Journal 1967年第N 1期v 79卷 p77-85页

作者： Birnbaum, L.S. Bukzin, E.A. Saroyan, J.R. Leon S. Birnbaum holds a B.S. degree in Chemistry from City College of New York. He has completed graduate work in Chemistry at the University of Maryland and Temple University and in Technology and Management at American University. He has been with the Navy Department Washington since 1949 and is currently Head of the Coatings and Chemistry Branch of the Materials Development and Application Office of the Naval Ship Engineering Center. Responsibilities of this Branch include such items as coatings corrosion control techniques insulation chemical cleaning water treatment toxicology and detection and decontamination of biological and chemical warfare agents. Prior to this Mr. Birnbaum was employed in the Industrial Test Laboratory Philadelphia Naval Shipyard from 1938 to 1949. Work during this period included supervision of a section which inspected paints and allied materials and petroleum products to determine their suitability for Naval use and direction of research in fire retardant treatments. He is a member of the American Chemical Society Washington Paint Technical Group. National Association of Corrosion Engineers and the American Society of Naval Engineers. Mr. Bukzin is a research and development program manager in the Naval Ship Systems Command of the Department of the Navy in the fields of non-metallic materials fuels lubricants cold weather operations and several other areas. He is a graduate chemical engineer from New York University with additional training in naval architecture and management which culminated in his participation in the Senior Development Program at Cornell University during the summer of 1960. He has been employed by the Command and its predecessor for the past 2b years and has been in his present position of R&D planning and programming for the past six years. Prior to that his major technical responsibilities were in the field of elastomers and their applications. He received several awards and published a number of papers during those years. Mr. Bukzin is a me

Report on paints used on surface ships and submarines for protection against corrosion and prevention of fouling, and on work connected with development and evaluation of such coatings;experiences with "hot plastic", "cold plastic" and vinyl paints;hazards in use of vinyl paints and safety precautions;test techniques;new toxics (which are only kind so far satisfactory antifouling formulations) under test.

关键词： Ships

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