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A framework of evaluating partitioning mechanisms for agent-based simulation systems

A framework of evaluating partitioning mechanisms for agent-...

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42nd Annual Simulation Symposium 2009, ANSS 2009, Part of the 2009 Spring Simulation Multiconference

作者： Wang, Yongwei Cai, Wentong Low, Malcolme Yoke Hean Zhou, Suiping Tian, Feng Luo, Linbo Ong, Darren Wee Sze Hamilton, Benjamin D. Parallel and Distributed Computing Centre School of Computer Engineering Nanyang Technological University Singapore 639798 Singapore Singapore Singapore United States

ISBN: (纸本)9781617386404

For an agent-based system that aims to simulate a large number of agents under different scenarios, a proper partitioning mechanism is an essential factor to the performance of the system. However, there is still an issue on selecting/ developing an appropriate partitioning mechanism for a specific agent-based simulation system. One way is to implement distributed agent-based systems using multiple partitioning mechanisms and to compare their performance. However this is in general not feasible. In this paper, we propose a generic framework and a simple evaluation process to address the issue of selecting an appreciate partitioning mechanism by simulating the effect of the partitioning mechanism to predict its performance for an agent-based simulation system.

关键词： Circuit simulation

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A case study of multi-resolution modeling for crowd simulation

A case study of multi-resolution modeling for crowd simulati...

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2009 Spring Simulation Multiconference, SpringSim 2009

作者： Muzhou, Xiong Cai, Wentong Zhou, Suiping Low, Malcolme Yoke Hean Tian, Feng Chen, Dan Sze, Darrenwee Hamilton, Benjamin D. Parallel and Distributed Computing Centre Nanyang Technological University Singapore639798 Singapore ONG Defence Science and Technology Agency Singapore Technical Support Working Group United States

Crowd simulation has been becoming an efficient tool to study the crowd behavior and its movement. Macroscopic and microscopic approaches take a trade-off between efficiency and accuracy, but neither of them achieves the two goals at the same time. Aiming to achieve both efficiency and accuracy, a multi-resolution model is proposed in this paper for crowd simulation. The paper illustrates how macroscopic and microscopic models co-exist in a single simulator and the interactions between them. The simulation result of a case study shows that the proposed multi-resolution simulation model can obtain a more accurate result than that using a simple macroscopic model alone. The simulation performance is also improved in the meantime.

关键词： Efficiency

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Interfacing RePast with HLA using a generic architecture for COTS simulation package interoperability

Interfacing RePast with HLA using a generic architecture for...

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Spring Simulation Interoperability Workshop 2009

作者： Liang, Yuanxi Cai, Wentong Turner, Stephen J. Theodoropoulos, Georgios K. Minson, Rob Parallel and Distributed Computing Centre School of Computer Engineering Nanyang Technological University Singapore 639798 Singapore School of Computer Science University of Birmingham Edgebaston Birmingham B152TT United Kingdom

ISBN: (纸本)9781605607986

A Distributed Multi-Agent System (MAS) is often appropriate in solving large-scale experimental problems. RePast is a well-known simulation toolkit for agent-based modeling. In order to extend the scalability of RePast, one way is to partition the model into a distributed simulation. Interfacing RePast with the High Level Architecture (HLA) is a way to build the distributed system. This has previously been achieved in the HLA-RePast system by using a traditional interfacing approach which is time-consuming in the development process. In this paper, a new approach to interfacing RePast with the HLA is introduced. It is a pioneering attempt to adopt a generic architecture for Commercial Off-The-Shelf (COTS) simulation package interoperability to interface an agent-based simulation package with the HLA. A middleware called DSManager originally designed to support COTS simulation package interoperability, is proven to be able to support interoperability of RePast models in a fast and easy manner. The advantages and tradeoffs, and the performance of the new distributed RePast system are discussed and compared to the HLA-RePast system.

关键词： Interoperability

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Cluster based partitioning for agent-based crowd simulations 09

Cluster based partitioning for agent-based crowd simulations

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Simulation Winter Conference

作者： Yongwei Wang Michael Lees Wentong Cai Suiping Zhou Malcolm Yoke Hean Low Parallel and Distributed Computing Centre School of Computer Engineering Nanyang Technological University Singapore

ISBN: (纸本)9781424457717

Simulating crowds is a challenging but important problem. There are various methodologies in the literature ranging from macroscopic numerical flow simulations to detailed, microscopic agent simulations. One key issue for all crowd simulations is scalability. Some methods address this issue through abstraction, describing global properties of homogeneous crowds. However, ideally a modeler should be able to simulate large heterogeneous crowds at fine levels of detail. We are attempting to achieve scalability through the application of distributed simulation techniques to agent-based crowd simulation. Distributed simulation, however, introduces its own challenges, in particular how to efficiently partition the load between a number of machines. In this paper we introduce a method of partitioning agents onto machines using an adapted k-means clustering algorithm. We present, validate and use an analysis tool to compare the proposed clustered partitioning approach with a series of existing methods.

关键词： Computational modeling Clustering algorithms Partitioning algorithms Scalability Computer simulation Distributed computing Concurrent computing Numerical simulation Microscopy Humans

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Toward a Generic Framework for Modeling Human Behaviors in Crowd Simulation

Toward a Generic Framework for Modeling Human Behaviors in C...

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IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： Linbo Luo Suiping Zhou Wentong Cai Malcolm Yoke Hean Low Michael Lees Parallel and Distributed Computing Centre School of Computer Engineering Nanyang Technological University Singapore

This paper presents our ongoing work on modeling agents with human-like decision making and behavior execution capabilities in crowd simulation. We aim to provide a generic framework that reflects the major cognitive and physical processes as observed from human behaviors in real-life situations. The design of the framework is based on some basic assumptions and related cognitive theories on human behaviors in various real-life situations. In this paper, the cognitive architecture of our framework is presented, which emphasizes the role of experiences in human's decision making. The paper also briefly describes the design of agent's decision making process and presents a case study to show some results in a crowd simulation scenario.

关键词： Humans Decision making Intelligent agent Paper technology Computational modeling Computer simulation Distributed computing Conferences Concurrent computing Psychology

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Adapted quality resource selection using the Grid reputation-policy trust management service

Adapted quality resource selection using the Grid reputation...

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IADIS International Conference Informatics 2009, Part of the IADIS Multi Conference on Computer Science and Information Systems, MCCSIS 2009

作者： Zetuny, Yonatan Terstyanszky, Gabor Winter, Stephen Kacsuk, Peter Centre for Parallel Computing University of Westminster 115 New Cavendish Street London W1W 6UW United Kingdom MTA SZTAKI 1111 Kende utca 13 Budapest Hungary

ISBN: (纸本)9789728924867

The concept of trust and reputation had a long profound impact on the way systems were measured in terms of their credibility and performance. This has consecutively lead into numerous reputation-based trust management systems being deployed for various computing environments as a decision support tool for assessing the trustworthiness of participating parties. In the context of Grid computing, reputation-based trust management systems play an important role for supporting coordinated resource sharing as they can reduce job execution failure by selecting relatively competent resources based on aggregated historical recommendations and given job requirements. In this paper, we present the Grid reputation-policy trust management service (GREPTrust) for managing resource selection in computational grids. This infrastructure level service encompasses a novel reputation-policy trust model, which enables service consumers (e.g. monitoring toolkits and resource brokers), to carry out an active participation in the trust and reputation evaluation processes. This is achieved by enabling service consumers to augment standard reputation queries with a set of reputation-policy statements rectified as trust decision strategies. Each strategy forms complete trust metrics blueprint for the reputation algorithm and therefore allows fine-grained resource selection adapted to specific job requirements. © 2009 IADIS.

关键词： Grid computing

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Commercial-Off-The-Shelf Simulation Package interoperability: Issues and futures 09

Commercial-Off-The-Shelf Simulation Package interoperability...

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Simulation Winter Conference

作者： Simon J. E. Taylor Navonil Mustafee Stephen J. Turner Ke Pan Steffen Strassburger Centre of Applied Simulation Modelling School of Information Systems Computing & Maths Brunei University Uxbridge Middlesex UK Parallel & Distributed Computing Centre School of Computer Engineering Nanyang Technological University Singapore Singapore School of Economic Sciences Technical University Ilmenau Ilmenau Germany

ISBN: (纸本)9781424457717

Commercial-Off-The-Shelf Simulation Packages (CSPs) are widely used in industry to simulate discrete-event models. Interoperability of CSPs requires the use of distributed simulation techniques. Literature presents us with many examples of achieving CSP interoperability using bespoke solutions. However, for the wider adoption of CSP-based distributed simulation it is essential that, first and foremost, a standard for CSP interoperability be created, and secondly, these standards are adhered to by the CSP vendors. This advanced tutorial is on an emerging standard relating to CSP interoperability. It gives an overview of this standard and presents case studies that implement some of the proposed standards. Furthermore, interoperability is discussed in relation to large and complex models developed using CSPs that require large amount of computing resources. It is hoped that this tutorial will inform the simulation community of the issues associated with CSP interoperability, the importance of these standards and its future.

关键词： Computational modeling Context modeling Computer simulation Chip scale packaging Distributed computing Concurrent computing Logistics Computer languages Grid computing Information systems

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On the Design of RNA Sequences for Realizing Extended Shapes

On the Design of RNA Sequences for Realizing Extended Shapes

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International Joint Conference on Bioinformatics, Systems Biology and Intelligent computing, IJCBS

作者： Marc Hellmuth Daniel Merkle Martin Middendorf Interdisciplinary Centre of Bioinformatics Department of Computer Science University of Leipzig Leipzig Germany Department of Mathematics and Computer Science University of Southern Denmark Odense Denmark Parallel Computing and Complex Systems Group Department of Computer Science University of Leipzig Leipzig Germany

It is known that for two given secondary structures (defined by position of base pairings) an RNA string can easily be found that can fold into both structures. But for more than two secondary structures this is not necessarily possible. Moreover, when four or more secondary structures are given the problem to determine the least number of positions, such that after the removal of all incident base pairs, a compatible RNA sequence can be found, is known to be NP-complete (\cite{real_shapes}). In this paper we introduce pseudo edges that are used to forbid that certain base pairs can bind and therefore can be used to define the properties of possible RNA secondary structures. We study the complexity of the problem to design an RNA sequence that can fold into different secondary structures each of them is described by a set of required and forbidden base pairs. We refine the NP-completeness results of \cite{real_shapes} and show an analoguous NP-completeness result for the realization problem concerning the removal of (pseudo) edges. We also present a polynomial time method for checking the realizability of extended shape graphs. Furthermore, we empirically analyze the influence of pseudo edges on the realizability for sets of random RNA sequences and for sets of aptamers.

关键词： RNA Shape Switches Computer science Bioinformatics Sequences Systems biology Intelligent systems Biology computing Concurrent computing

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INTEGRATED SERVICE AND DESKTOP GRIDS FOR SCIENTIFIC computing

INTEGRATED SERVICE AND DESKTOP GRIDS FOR SCIENTIFIC COMPUTIN...

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第八届分布式计算及其应用国际学术研讨会

作者： Robert Lovas Tamas Kiss Computer and Automation Research Institute Hungarian Academy of Sciences Kende u.13-17Budapest1111Hungary Centre for Parallel Computing University of Westminster 115 New Cavendish StreetLondonW1W 6UWUK

Currently two different approaches can be distinguished in the research and development of Grid *** case of traditional Service Grids(such as operated in the EGEE project),the infrastructure consists of several well maintained clusters and data centers,which are provided by institutes and universities in order to serve the demands of large user *** the other hand,Desktop Grid solutions -such as Internet-based distributed or volunteer computing infrastructures-usually collect non-reliable resources from the donors(desktop PC owners)for some selected,grand challenge *** this paper we discuss a generic bridge solution between these different computation platforms,and demonstrate its capabilities and advantages by applications. As one of the key issues,the software build,test,and validation procedures in such heterogeneous environment will be outlined based on the ETICS-2 services as *** presented solution tries to offer best practices for other Grid initiatives and projects;how to tackle the digital fragmentation with gateways,quality assurance and reliability issues concerning scientific Grid systems.

关键词： Desktop Grid,Service Grid,Gateway, Applications,Build and Test Procedures,Validation,Software Quality

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Shared variable management in SOAr-DSGrid

Shared variable management in SOAr-DSGrid

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2nd Asia International Conference on Modelling and Simulation, AMS 2008

作者： Chen, Xinjun Cai, Wentong Turner, Stephen J. Wang, Yong Parallel and Distributed Computing Centre School of Computer Engineering Nanyang Technological University Singapore 639798 Singapore

ISBN: (纸本)9780769531366

Simulation is a low cost alternative to experimentation on real-world physical systems. In light of the prevalence of web services, issues relating to distributed simulation using web services have come to the fore in recent years. We have proposed a service-oriented architecture for distributed simulations on the Grid (SOAr-DSGrid). SOAr-DSGrid facilitates the development and execution of distributed simulations in different views (i.e., a component-based view for development and a service-oriented view for execution). At run time, one component may require information from another component for execution or decision-making. In SOAr-DSGrid, this shared information from one component to another component is implemented through shared variables. Since two components may execute out of phase, without proper shared variable management, the value provided by one component may be invalid for another component due to the time difference. Since SOAr-DSGrid provides a service-oriented view for component execution, the development of shared variable support also follows the service-oriented methodology. Three different approaches, namely Pull without FutureList, Pull with FutureList, and Push, have been implemented as the internal mechanism to solve the shared variable issue. Experimental results of the performance of these three approaches are also presented in this paper. © 2008 IEEE.

关键词： Web services

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