检索结果-内蒙古大学图书馆

作者： Luo, Linbo Yin, Haiyan Cai, Wentong Lees, Michael Zhou, Suiping Parallel and Distributed Computing Centre School of Computer Engineering Nanyang Technological University Singapore Singapore School of Computing Teesside University Middlesbrough United Kingdom

For a virtual training system, how to effectively and quickly generate training scenarios has become a challenging issue. A scenario generation system is needed to produce scenarios that can meet different objectives and at the same time be customized for individuals. In this paper, we introduce a scenario generation framework for mission-based virtual training, which aims to generate scenarios from both trainer and trainee's perspective. The framework allows a trainer to direct the scenario generation process, so that the generated scenarios reflect the trainer's preferences over different mission objectives. It also considers how the scenarios could adapt to different trainees' skill levels. The representation of scenario beat is proposed, and the scenario generation process adopts a combinatorial optimization approach generating the sequence of scenario beats. The efficacy of the proposed framework is demonstrated through an empirical study of human players in a simple food distribution mission game. The results show that a trainee can achieve better performance improvement when playing the customized scenarios tailored to the trainee's skill level as compared with the uncustomized scenarios. Copyright © 2013 John Wiley & Sons, Ltd.

关键词： Combinatorial optimization

来源：评论

学校读者我要写书评

暂无评论

A FRACTURE-MECHANICAL CELLULAR-AUTOMATON MODEL OF SEISMICITY

引用

PURE AND APPLIED GEOPHYSICS 1994年第3-4期142卷 545-565页

作者： HENDERSON, JR MAIN, IG MACLEAN, C NORMAN, MG Department of Geology and Geophysics University of Edinburgh Edinburgh UK Department of Physics University of Edinburgh Edinburgh UK Edinourgh Parallel Computing Centre University of Edinburgh Edinburgh UK

We present a cellular automaton model which simulates the process of seismogenesis using rules for evolution which are derived from the field of fracture mechanics, and include an interplay of positive and negative feedbacks. We describe the implementation of this model, and its analysis, in a massively parallel environment using the Connection Machine. Starting from a lattice with a fractal distribution of fracture toughnesses, the b value evolves in a way which closely mimics both the evolutions of b value observed in the laboratory and derived from earthquake catalogues, reaching a broad and irregular maximum in the period preceding a major event, and declining rapidly during catastrophic failure. We conclude that the processes modelled are a reasonable representation of those occurring in Nature, and that the cellular automaton paradigm is a valuable way of simulating these processes on a large scale in an economical manner.

关键词： SEISMICITY CELLULAR AUTOMATA FRACTURE MECHANICS B-VALUES COMPLEXITY

来源：评论

学校读者我要写书评

暂无评论

Spatial indexing in agent-based crowd simulation 6

Spatial indexing in agent-based crowd simulation

引用

6th International Conference on Simulation Tools and Techniques, SIMUTools 2013

作者： Othman, Nasri Bin Luo, Linbo Cai, Wentong Lees, Michael Parallel and Distributed Computing Centre School of Computer Engineering Nanyang Technological University Singapore639798 Singapore

ISBN: (纸本)9781936968763

Crowd modeling and simulation has become a critical tool for understanding crowds and predicting their behaviours. This is accomplished by modelling the characteristics and behaviours of large groups of people, as well as their interactions. Agent-based crowd simulation may involve thousands of complex agents interacting in sophisticated ways, in close spatial proximity, with each other. A key challenge to the development of agent-based crowd simulation is the inherent complexity that is required to model all its necessary elements. A necessary feature of such a simulation is spatial indexing. This refers to the use of data structures to organize collections of simulation entities (e.g., agents and obstacles) in a manner which allows for efficient spatial querying. This is especially pertinent for large-scale crowd simulation with agents that sense their surrounding environment periodically, as the cost of spatial querying becomes computationally expensive if done naively. In this paper, we will describe our experience in improving the existing grid-based spatial indexing approach in our agent-based crowd simulation. Also, we will explore the integration of the adaptive spatial indices (e.g., R-tree and quad-tree) into our system. The performances of various spatial indexing techniques are examined in terms of efficiency and scalability. Copyright © 2013 ICST.

关键词： Decision trees

来源：评论

学校读者我要写书评

暂无评论

A framework of Intelligent Environment with Smart-Active Objects (IESAO) for flexible and efficient crowd simulation 10

A framework of Intelligent Environment with Smart-Active Obj...

引用

Proceedings of the 2010 Spring Simulation Multiconference

作者： Liang, Anson Yuanxi Low, Malcolm Yoke Hean Lees, Michael Harold Cai, Wentong Zhou, Suiping Parallel and Distributed Computing Centre School of Computer Engineering Nanyang Technological University Singapore 639798 Singapore

ISBN: (纸本)9781450300698

Agent-based crowd simulation has been widely applied in the analysis of evacuation safety under disastrous and terrorist circumstances. In crowd simulation, the virtual environment plays an important role in influencing human behavior and defining the scenario. The concepts of informed environment and smart objects have been adopted to improve the realism of the simulation by embedding semantic information in the environment. However, there is no formal approach of using these concepts in crowd simulation. In this paper, we propose a flexible and efficient framework of Intelligent Environment with Smart and Active Objects (IESAO). We properly define different types of entities and interactions, and describe the approach of modeling environment-related behavior in the intelligent environment. This framework gives a new perspective of modeling human behavior in the design phase. An implementation and a case study are discussed to show the flexibility and efficiency of this framework. © 2010 SCS.

关键词： Semantics

来源：评论

学校读者我要写书评

暂无评论

Performance evaluation of a bandwidth requirements reduction technique based on timely state update

Performance evaluation of a bandwidth requirements reduction...

引用

38th Annual Simulation Symposium, ANSS-38 2005

作者： Cai, Wentong Turner, Stephen John Zhou, Suiping Wei, Junhu Zong, Wenbo Parallel and Distributed Computing Centre School of Computer Engineering Nanyang Technological University Singapore 639798 Singapore

ISBN: (纸本)0769523226

An important issue in distributed real-time simulation is to reduce the amount of data transmitted amongst distributed simulation nodes so that the state updates of simulation entities can be sent to other simulation nodes in a timely manner. To address this issue, we have previously proposed a consistency model to determine the update interval of entities based on their relative importance, a utility model to compute the relative importance of entities, and a flexible state update mechanism to ensure updating within these intervals and to balance the number of updates in each simulation frame. In this paper, we focus on the performance evaluation of these timely state update mechanisms. Using a battlefield benchmark, the performance is evaluated in terms of the total amount of data exchanged, the number of simulation frames skipped, and the number of Go-Through-Accidents occurring during the simulation. The performance results indicate that the mechanisms can significantly reduce the bandwidth requirements while maintaining or even improving the consistency of the simulation. © 2005 IEEE.

关键词： Data reduction

来源：评论

学校读者我要写书评

暂无评论

The parallel Utilities Library

The Parallel Utilities Library

引用

1994 Scalable parallel Libraries Conference, SPLC 1994

作者： Chapple, S.R. Clarke, L.J. Edinburgh Parallel Computing Centre Edinburgh University EdinburghEH9 352 United Kingdom

ISBN: (纸本)0818668954

The paper describes the parallel Utilities Library (PUL) which has been in development at Edinburgh parallel computing centre (EPCC) since 1991. The primary aim of this project has been to support the porting of commercial and industrial applications to parallel systems by providing commonly required services within a suite of library modules implemented on top of message-passing. The library includes support for task parallelism, domain decomposition, unstructured mesh applications and parallel scalable I/O and has recently been ported to the emerging Message-Passing Interface (MPI) standard. A large number of industrial application codes have been parallelised by making use of PUL and we report on three such projects that have been carried out with Rolls-Royce, AEA Technology and Shell UK. © 1994 IEEE.

关键词： Message passing

来源：评论

学校读者我要写书评

暂无评论

Agent communication in distributed simulations 1

引用

Joint Workshop MABS 2004

作者： Wang, Fang Turner, Stephen John Wang, Lihua Parallel and Distributed Computing Centre School of Computer Engineering Nanyang Technological University 639798 Singapore Singapore

ISBN: (数字)9783540322436

ISBN: (纸本)3540252622

Multi-Agent Systems (MASs) provide a valuable tool for handling increasing software complexity and supporting rapid and accurate decision making. Various environments for testing, analyzing and developing MASs have been developed. This paper describes an approach to integrating agents into distributed simulations. Using the JADE toolkit and the HLA (High Level Architecture), a general architecture is obtained, where both the high level agent specific services and the underlying middleware comply with international standards. In this paper, we show how an MAS may be used to represent entities in a simulation, focusing on the issue of agent to agent communication, as this is one of the key characteristics of MASs. The causality problem in agent communication is described, and conditions for ensuring consistency are identified. A prototype system has been implemented to demonstrate the feasibility of our solution and some experimental results are presented. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Multi agent systems

来源：评论

学校读者我要写书评

暂无评论

Multi-agent interactions in distributed virtual worlds

Multi-agent interactions in distributed virtual worlds

引用

IEEE TENCON 2004 - 2004 IEEE Region 10 Conference: Analog and Digital Techniques in Electrical Engineering

作者： Wang, Fang Turner, Stephen John Wang, Lihua Parallel and Distributed Computing Centre School of Computer Engineering Nanyang Technological University 639798 Singapore Singapore

Multi-agent systems provide a valuable tool for handling increasing software complexity and supporting rapid and accurate problem solving. This paper presents a general architecture in which autonomous agents are embedded in a distributed virtual environment and are enabled to communicate with each other. We focus on the interaction issues, using cooperation and coordination patterns. Different cases of the agents' teamwork to improve their efficiency are investigated and compared. A prototype system has been implemented, with message templates and algorithms identified. Finally, some experimental results are given. © 2004 IEEE.

关键词： Multi agent systems

来源：评论

学校读者我要写书评

暂无评论

Shared variable management in SOAr-DSGrid

Shared variable management in SOAr-DSGrid

引用

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

来源：评论

学校读者我要写书评

暂无评论

NVRAM as an Enabler to New Horizons in Graph Processing

引用

SN Computer Science 2022年第5期3卷 385页

作者： Capelli, Ludovic Anthony Richard Brown, Nicholas Bull, Jonathan Mark School of Informatics The University of Edinburgh Edinburgh United Kingdom Edinburgh Parallel Computing Centre The University of Edinburgh Edinburgh United Kingdom

From the world wide web, to genomics, to traffic analysis, graphs are central to many scientific, engineering, and societal endeavours. Therefore an important question is what hardware technologies are most appropriate to invest in and use for processing graphs, whose sizes now frequently reach terabytes. Non-Volatile Random Access Memory (NVRAM) technology is an interesting candidate enabling organisations to extend the memory in their systems typically by an order of magnitude compared to Dynamic Read Access Memory (DRAM) alone. From a software perspective, it permits to store a much larger dataset within a single memory space and avoid the significant communication cost incurred when going off node. However, to obtain optimal performance one must consider carefully how best to integrate this technology with their code to cope with NVRAM esoteric properties such as asymmetric read/write performance or explicit coding for deeper memory hierarchies for instance. In this paper, we investigate the use of NVRAM in the context of shared memory graph processing via vertex-centric. We find that NVRAM enables the processing of exceptionally large graphs on a single node with good performance, price and power consumption. We also explore the techniques required to most appropriately exploit NVRAM for graph processing and, for the first time, demonstrate the ability to process a graph of 750 billion edges whilst staying within the memory of a single node. Whilst the vertex-centric graph processing methodology is our main focus, not least due to its popularity since introduced by Google over a decade ago, the lessons learnt in this paper apply more widely to graph processing in general. © 2022, The Author(s).

关键词： DCPMM NVRAM Vertex-centric

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：