A DEVS fire jumps model and associated simulations using ForeFire
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This paper describes a simple physical model of the phenomenon of fire jumps. The model behaviour is developed using DEVS Formalism and simulated in Discrete Event fashion. The aim of this work is to be able to simulate this phenomenon within the ForeFire DEVS fire spread simulator and to obtain acceptable results in less than a minute for a large wildfire. The proposed sub-model is validated using a set of experimental and numerical studies. Results show that the overall fire spread simulation performs well after the addition of the fire jumps sub-model and enhances the quality of the outputs in order to help fire-fighters.Keywords:
DEVS
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Objective-driven DEVS modeling using OPI matrix for performance evaluation of discrete event systems
DEVS (Discrete Event Systems Specification) models are widely employed for simulation-based performance evaluation of discrete event systems. Performance modeling of such a system requires a pruning of a set of components, or objects, within the system in its subset which are eventually transformed into simulation models. Such modeling is objective-driven in that simulation models may be abstract enough to measure performance indices which reflect simulation objectives. This paper proposes a practical tool, called an OPI (Object-Performance Index) matrix which is useful for such pruning in the objective-driven DEVS modeling. It also presents transformation of the pruned objects to DEVS models for performance simulation. An overall procedure for the objective-driven DEVS modeling from given objectives is presented and a simple example is illustrated.
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The paper reports on an effort to use both the system theoretic DEVS (discrete event simulation) formalism and the JavaBeans component model as a basis for a component based discrete event simulation framework. The result of the synergism of DEVS and JavaBeans is a powerful component based simulation framework together with a set of flexible bean components for building simulation systems. Component frameworks are dedicated and focused architectures with a set of policies for mechanisms at the component level. We describe the component framework we have developed for discrete event simulations. Simulation components are based on this framework and can be composed for the creation of various simulation scenarios.
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This paper presents a hybrid modeling/simulation framework within which both accuracy in models and speed in simulation experimentations are obtained. Based on the Zeigler's DEVS formalism and associated system theory, the framework is based on the transformation of selected DEVS model into equivalent analytic ones to simulate both analytic and simulation models within a single environment. For high-speed hybrid simulation, the authors extended DEVSim++ which is a realization of the DEVS formalism in C++. To exemplify the proposed approach, the authors demonstrate performance modeling and simulation of a simple communication network.< >
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Formalism (music)
Discrete-Event Simulation
Simulation Modeling
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DEVS
Formalism (music)
Discrete-Event Simulation
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As the number of flexible, adaptable systems grows so does the need for specification and analysis tools that support adaptable system structures. The increasing number of simulation tools that equip models with the capability of changing their behavior patterns, composition, and interactions raises the desire for a theoretical and methodological approach. A formalism is introduced based on DEVS which emphasizes the reflective nature of variable structure models. The proposed formalism and DEVS are shown to be bisimilar, which emphasizes the role of variable structure models as an agency of modularization. The formalism is used to reveal general problems and solutions in implementing variable structure models.
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DEVS는 이산적으로 발생하는 사건을 체계적으로 기술하기 위한 formalism이다. 디지탈 시스템을 기술하는 단계중 RTL단계는 레지스터 연산을 통하여 시스템을 기술하는 단계이며, 이를 지원하는 여러가지 언어 및 시뮬레이션 환경이 제안되었다. 본 논문에서는 RTL 단계에서 디지탈 시스템을 기술하고 시뮬레이션하기 위한 환경을 DEVS formalism에 기초하여 구현하였다. 기술 언어로써 C++를 사용하여 기존의 객체 지향 환경을 그대로 이용할 수 있으며, RTL 단계로 기술하는 데 필요한 자료 형과 연산자는 클래스로 구현하였다. 그리고, 이 환경을 이용하여 386 PC 시스템을 RTL 단계로 기술하고 시뮬레이션하였다.
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Cell-DEVS is an extension to the DEVS formalism that allows the definition of cellular models. Complex physical systems can be defined using simple rules, reducing the development. We present the definition of a model of flow injection using Cell-DEVS. The simulation validation results showed a margin of error within the expected values for the experiment, showing how to employ the formalism in analyzing physical systems.
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The discrete event systems specification (DEVS) simulation has been studied to analyze complex homogeneous systems which is represented by the cellular models. In the simulation of large-scale DEVS cellular model, it requires a high-performance simulation technique such as parallel simulation. This paper presents a parallel discrete event simulation (PDES) environment using a graphics processing unit (GPU) to simulate DEVS cellular models. In the proposed PDES environment, the DEVS cellular models and their corresponding simulators are mapped to the GPU. Due to the features of the GPU, two parts of the traditional DEVS simulation algorithm are revised. The first is about managing the event list, and the second is about routing output events. To verify the efficiency of the proposed environment, we designed and experimented the case study for a fire-spreading phenomenon, and analyzed the experimental results.
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Graphics processing unit
Simulation Modeling
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This paper presents a formal modeling and simulation framework for mobile agent sys tems. A Mobile Discrete Event System Specifi cation (MDEVS) formalism is proposed to rep resent the dynamics of mobile agent systems. The MDEVS formalism supports structural changes of the systems, which include the cre ation, addition, deletion, and migration of mod els and the dynamic changes of couplings be tween models. AgentSim is a software environ ment for the simulation and execution of mobile agent systems modeled by the MDEVS formalism. AgentSim is implemented as a li brary built on IBM's Aglets. The modeling and simulation of an e-commerce mobile agent sys tem is exemplified to demonstrate the effective ness of the proposed modeling framework and the associated simulation environment.
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Mobile agent
IBM
Complex system
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Describes the DEVS-CLOS modeling and simulation environment. The environment combines Ziegler's (1976) discrete event simulation (DEVS) formalism with the powerful constructs of CLOS (Common LISP Object System). DEVS-CLOS allows dynamic model creation and modification and is capable of supporting advanced simulation research, as well as applications. >
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Clos network
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Common Lisp
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Object-Oriented Modeling
GPSS
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