检索结果-内蒙古大学图书馆

1st DEVS Integrative M and S Symposium, DEVS 2005, Part of the 2005 Spring simulation Multiconference, SpringSim 2005

作者： Jammalamadaka, R. Nutaro, J. Gettings, M.E. Zeigler, B.P. Department of Electrical and Computer Engineering Arizona Center for Integrative Modeling and Simulation University of Arizona Tucson AZ 85721 United States

Discrete Event simulation is a natural way to simulate models that are characterized by heterogeneity in their spatio-temporal behavior. This paper describes a valley fever spore-propagation model that describes the time dependent spatial distribution of spores in southern Arizona. Two implementations of this model are examined and their execution times are compared. A discrete event model exploits the fact that only a few areas are favorable for the growth of the fungus at any given time. This allows it to schedule events only at the areas that are favorable. In contrast, the existing discrete time model cannot take advantage of the few areas that are favorable.

关键词： Discrete event simulation

来源：评论

学校读者我要写书评

暂无评论

Continuity and change (activity) are fundamentally related in DEVS simulation of continuous systems

Continuity and change (activity) are fundamentally related i...

引用

13th International Conference on AIS 2004

作者： Zeigler, Bernard P. Jammalamadaka, Rajanikanth Akerkar, Salil R. Arizona Center for Integrative Modeling and Simulation Department of Electrical and Computer Engineering University of Arizona Tucson AZ 85721 United States

The success of DEVS methods for simulating large continuous models calls for more in-depth examination of the applicability of discrete events in modeling continuous phenomena. We present a concept of event set and an associated measure of activity that fundamentally characterize discrete representation of continuous behavior. This metric captures the underlying intuition of continuity as well as providing a direct measure of the computational work needed to represent continuity on a digital computer. We discuss several application possibilities beyond high performance simulation such as data compression, digital filtering, and soft computation. Perhaps most fundamentally we suggest the possibility of dispensing with the mysteries of traditional calculus to revolutionize the prevailing educational paradigm. © Springer-Verlag Berlin Heidelberg 2005.

关键词： computer systems

来源：评论

学校读者我要写书评

暂无评论

Discrete event multi-level models for systems biology

引用

Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2005年 3380 LNBI卷 66-89页

作者： Uhrmacher, Adelinde M. Degenring, Daniela Zeigler, Bernard Institute for Computer Science University of Rostock Albert-Einstein-Str. 21 D-18059 Rostock Germany Arizona Center of Integrative Modeling and Simulation University of Arizona Tucson AZ 85721 United States

ISBN: (纸本)3540254226

Diverse modeling and simulation methods are being applied in the area of Systems Biology. Most models in Systems Biology can easily be located within the space that is spanned by three dimensions of modeling: continuous and discrete;quantitative and qualitative;stochastic and deterministic. These dimensions are not entirely independent nor are they exclusive. Many modeling approaches are hybrid as they combine continuous and discrete, quantitative and qualitative, stochastic and deterministic aspects. Another important aspect for the distinction of modeling approaches is at which level a model describes a system: is it at the "macro" level, at the "micro" level, or at multiple levels of organization. Although multi-level models can be located anywhere in the space spanned by the three dimensions of modeling and simulation, clustering tendencies can be observed whose implications are discussed and illustrated by moving from a continuous, deterministic quantitative macro model to a stochastic discrete-event semi-quantitative multi-level model. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Data structures

来源：评论

学校读者我要写书评

暂无评论

Robots in the loop: Supporting an incremental simulation-based design process

Robots in the loop: Supporting an incremental simulation-bas...

引用

IEEE Systems, Man and Cybernetics Society, Proceedings - 2005 International Conference on Systems, Man and Cybernetics

作者： Hu, Xiaolin Ganapathy, Narayanaswami Zeigler, Bernard P. Computer Science Department Georgia State University Atlanta GA United States Arizona Center for Integrative Modeling and Simulation University of Arizona Tucson AZ United States

This paper presents the results of applying an incremental simulation-based design process to study a robotic convoy system. Robot-in-the-loop simulation, as a major step in this process, allows the system to be measured with combined robot models and real robots. This capability effectively bridges the gap between conventional simulation where models are used and real system experiment where real robots are used. For each step in this incremental process, the simulation/experiment setup is described. The measurement data are then presented and compared. These experiments and results demonstrate the capabilities of robot-in-the-loop simulation and justify the effectiveness of using the incremental simulation-based design process. © 2005 IEEE.

关键词： Robots

来源：评论

学校读者我要写书评

暂无评论

Segregation of binary mixtures of particles in a bladed mixer

Segregation of binary mixtures of particles in a bladed mixe...

引用

5th International Conference on the Micromechanics of Granular Media: Powders and Grains 2005

作者： Zhou, Y.C. Chandratilleke, G.R. Yu, A.B. Bridgwater, J. Centre for Computer Simulation and Modeling of Particulate Systems School of Materials Science and Engineering University of New South Wales Sydney Australia Department of Chemical Engineering University of Cambridge United Kingdom

ISBN: (纸本)0415383471

This paper presents a numerical study of the flow and segregation of particles over flat blades in a vertical cylindrical mixer by using discrete element method. simulations are conducted on binary mixtures of spheres with different size ratios. Similar flow features are found for all the cases considered: particles rise forming a heap in front of the blade. One part of this vertical flow goes over the blade and toward the bed surface;another part goes down to the base of the heap in front of the blade to rejoin the flow toward the blade. In addition, there is a recirculating zone in front of the blade. Changing blade speed affects the mixing kinetics but not the mixing quality. Large particles are mainly inthe top layer of the mixing bed, while small particles remain in the bottom of the mixing bed and in front of the blades. Analysis of the force acting on the particles shows that at the initial stage, large particles always receive a relatively large vertical force than small particles leading to segregation that can be maintained at a later stage. Different mixing behavior is quantified for mixtures of different size ratios. © 2005 Taylor & Francis Group.

关键词： Segregation (metallography)

来源：评论

学校读者我要写书评

暂无评论

Accurate Multl-polnt Padce Approxlmatlon of Mlicrowave Structures using Orthonormal Polynomlal Basls Functions

Accurate Multl-polnt Padce Approxlmatlon of Mlicrowave Struc...

引用

International Conference on Applied Electromagnetics and Communications (ICECom)

作者： D. Deschrijver T. Dhaene Computer Modeling and Simulation of Complex Systems COMS University of Antwerp Antwerp Belgium

Rational least-squares techniques are commonly used to build compact macromodels of passive microwave components. This paper describes a technique which calculates rational least-squares fitting models by matching S-parameter frequency data-samples and higher-order frequency derivatives (or moments) using orthonormal polynomial basis functions to improve the numerical accuracy. Some considerations are given about the optimal choice ofpolynomial basisfunctions.

关键词： Polynomials Frequency Computational modeling Least squares approximation Scattering parameters Symmetric matrices Computational efficiency computer simulation Microwave theory and techniques Power system modeling

来源：评论

学校读者我要写书评

暂无评论

Experimental evaluation of the effect of varying levels of crowd behavior fidelity on the outcome of certain military scenarios

Experimental evaluation of the effect of varying levels of c...

引用

2005 Spring simulation Interoperability Workshop, SIW 2005

作者： Hunter, Kelly R. Petty, Mikel D. McKenzie, Frederic D. Virginia Modeling Analysis and Simulation Center Old Dominion University NorfolkVA23529 United States Department of Electrical and Computer Engineering Old Dominion University NorfolkVA23529 United States

Crowds of non-combatants play a large and increasingly recognized role in modern military operations, and often create substantial difficulties for the combatant forces involved. However, in spite of their potential significance, realistic models of crowds are essentially absent from current military simulations. We have developed a crowd simulation that is interoperable with existing military simulations via HLA and has a credible psychological basis for the cognitive model it used to generate crowd behavior. Though the need for crowd modeling in military simulation has been widely recognized, it is not clear how much fidelity crowd models must have to be effective. The implemented Crowd Federate was used to conduct an experiment to investigate the level of crowd behavior fidelity needed to significantly affect the outcome and utility of a military simulatio. Six levels of behavior fidelity were identified and implemented using different configurations of the crowd federate. Multiple trials for the first five levels were executed using a historical reference scenario. Data regarding several measures of performance were gathered, including mission success, mission time, casualties, and perceived realism. Unfortunately, anomalous events in the military simulation federated with the Crowd Federate confounded the results of the experiment, preventing a fine assessment of the effect of the different levels of behavior fidelity. However, the trials were clearly more realistic when the simulated crowd was present. © 2005 The MITRE Corporation. All rights reserved.

关键词： Military operations

来源：评论

学校读者我要写书评

暂无评论

Integrating fire suppression into a DEVS cellular forest fire spread model

Integrating fire suppression into a DEVS cellular forest fir...

引用

1st DEVS Integrative M and S Symposium, DEVS 2005, Part of the 2005 Spring simulation Multiconference, SpringSim 2005

作者： Ntaimo, Lewis Zeigler, Bernard P. Department of Industrial Engineering Texas A and M University College Station TX 77843 United States Department of Electrical and Computer Engineering Arizona Center for Integrative Modeling and Simulation University of Arizona Tucson AZ 85721 United States

This paper deals with modeling and simulation of surface forest fire spread and suppression using the discrete event system specification (DEVS) cellspace approach. The event-based modeling approach allows for timely simulation-based predictions of forest, fire spread and suppression in uniform and non-uniform environmental conditions. This paper proposes a conceptual model for a coupled forest cell model comprising of a forest cell agent atomic model and a forest cell atomic model The forest cell agent atomic model will allow for modeling and simulation of more complex fire suppression strategies to control fire spread. The proposed basic model provides an advance toward developing a real-time or fast-as-can decision support simulation system for predicting forest fire spread and the effects of fire suppression attempts.

关键词： Cells

来源：评论

学校读者我要写书评

暂无评论

Packet- vs. session-based modeling for intrusion detection systems

Packet- vs. session-based modeling for intrusion detection s...

引用

ITCC 2005 - International Conference on Information Technology: Coding and Computing

作者： Caulkin, Bruce D. Lee, Joohan Wang, Morgan Department of Modeling and Simulation University of Central Florida Orlando FL 32816 Computer Science Department University of Central Florida Orlando FL 32816 Department of Statistics and Actuarial Science University of Central Florida Orlando FL 32816

ISBN: (纸本)0769523153

In today's interconnected networks, Intrusion Detection Systems (IDSs), encryption devices, firewalls and other hardware and software solutions are critical in providing complete security solutions for corporations and government agencies. Many IDS variants exist which allow security personnel to identify attack network packets primarily through the use of signature detection where the IDS "recognizes" attack packets due to their well-known signatures as those packets cross the network's gateway threshold. However, anomaly-based ID systems identify normal traffic within a network and report abnormal behavior. We report the findings of our research in the area of anomaly-based intrusion detection systems using data-mining techniques to create a decision tree model of our network using the 1999 DARPA Intrusion Detection Evaluation data set. After the model was created, we gathered data from our local campus network and scored the new data through the model using both packet-based and session-based modeling and compare the results. © 2005 IEEE.

关键词： Interconnection networks

来源：评论

学校读者我要写书评

暂无评论

The computational complexity of component selection in simulation reuse 05

The computational complexity of component selection in simul...

引用

simulation Winter Conference

作者： R.G. Bartholet D.C. Brogan P.F. Reynolds Modeling and Simulation Technology Research Initiative Department of Computer Science University of Virginia Charlottesville VA USA

ISBN: (纸本)9780780395190

simulation composability has been much more difficult to realize than some initially imagined. We believe that success lies in explicit considerations for the adaptability of components. In this paper, we show that the complexity of optimal component selection for adaptable components is NP-complete. However, our approach allows for the efficient adaptation of components to construct a complex simulation in the most flexible manner while allowing the greatest opportunity to meet all requirements, all the while reducing time and costs. We demonstrate that complexity can vary from polynomial, to NP, and even to exponential as a function of seemingly simple decisions made about the nature of dependencies among components. We generalize these results to show that regardless of the types or reasons for dependencies in component selection, just their mere existence makes this problem very difficult to solve optimally.

关键词： Computational complexity Computational modeling Software engineering Polynomials computer simulation Research initiatives computer science Cost function Buildings Real time systems

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：