Resarch on Integration of Multi-Resolution Model in D istributed S imulation

Abstract—In nowadays, integrate the distributed simulation has become a primary way when a serious of higher functions of the simulation are needed, which based on the uniform description and understanding. Integration of the simulation is essentially the integration of model, so maintain the coincidences of the resolution is the key to achieve the integration of simulaitions. This paper has proposed a new way of integrate the Multi-Resolution Models first, then a serious of description of the model, interface and integration activity are proposed, this will be a foundation of the model integration in the mass-distributed simulation.

I. INTRODUCTION

HE mass-distributed simulation(MDS) is a kind of work that system-oriented, a uniform of description and understanding to the model are seriously needed.

The integration of the simulation is essentially a problem of integration of Multi-Resolunton models(MRM), which belongs to the Multi-Resolunton simulation activity. Different information are included in different hiberarchy simutiaons, the low-resolution model will contain more abroad information and the high-resolution simulation contain more detail information, so maintain the consistency of the Multi-Resolunton models is the key issue in the integration of mass-distributed simulations. The entity model is a central model in mass-distributed simulations, which is consist of entity attributes and entity behaviors,integration of Multi-Resolunton models is the keystone of .research on achieve the MDS.

A. Motivation

The Multi-Resolunton modeling is a new issues of simulation domain, so the integration of Multi-Resolunton model has no standard to follow at present that need a lot of Resarch work to do. This paper has discussed a new way of integration of MRM and the description of integrate activity theoreticly based on MRM.

B. Related works

Little literature exists on issue of Multi-Resolunton integrations in a MDS. Some serializing works have discussed the Multi-Resolunton:

The factors of MDS and the simulation mapping architecture are analyzed. The main method of MRM was discussed. The architecture of joint operations simulation was given. the modeling framework of MDS based on the MRM was designed.[1];besides of the theoretic research,

Zhong Liu, Li Gong , and Gaofeng Liu are with the Naval University of Engineering

based on the discussion of the content of SoS combat interaction mode-ling and simulation and its accommodated new modeling methods, the modeling of the SoS combat integrated interaction, the entity interaction and the interaction effect are researched, and the instances of interaction model are presented. [2], but these research had neglected the integration of the MRM for this issue is the basement of the simulation integration.

The rest of the paper is organized as follows: Section 2 describes the problem in integration of MRM. In section3, the concept of Multi-Resolunton model integration(MRMI) is proposed, the description of activity and the integration models were discussed. In section4,the activity of MRMI in detail were presented, Then the characters of MRMI were discussed in the section 5, Conclusion is mentioned in section6.

II. PORBLEM

A. Challenges by MDS

As the development of simulations in terms of complexity and scale, integrating the existed simulations is inevitablely becoming the key method to achieve the MDS which will references the issue of MRM.The interactions amoung multi- hiberarchy and multi-resolution models are inevitablely. So, a standard way of the MRM integarion was needed, which can promote the feasibility and save the simulation resoureces.

In the domain of entity modeling, there are two aspects to be considerate: attributes and behaviors, so the encapsulation and inter action were to be considerate corresponding in the simulation integration. Althoug the mapping from cognitive domain to simulation domain can help us modeling the MRM, lacking of a methodology to instruct the interaction of the MRMs, the detail problem of interactions cannot be resolved well, it is looks like that descriptions of the interfaces when MRM integrating are needed, with these interfaces, the integrations of MRM will be easier and faster, the interfaces of MRM is shown in figure 1.

Liu Zhong, Gong Li, and Gaofeng Liu

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Fourth International Workshop on Advanced Computational Intelligence Wuhan, Hubei, China; October 19-21, 2011

978-1-61284-375-9/11/$26.00 @2011 IEEE 164

Figure 1. Interfaces of MRM

III. THE CONCEPTS OF MRMI

A. Definitions of MRMI

Multi-Resolution Modeling Integration (MRMI) is a methodology of MRM integration, it looks the model as a integration unit that contain a serious of attributes, behaviors,it defines a serious of process(coupling, checking, analyze,link, refine )to achieve the MRM integration.

B. Form of MRMI

There two types of integration of MRM: one is structural integration and behavior integration for another.

The structural integration modeling with pasting the different models to a new MRM, it is content to the realization of the model, by the consistent interfaces, the models interact at structural level.

The behavior integration is based on the interaction of models, it is more difficult than the previous one, for the model would play various of functions in various of operation status, which will reference the bottom realization and the mapping interface of models, a unfeasibility MRM will be created if lacking of consideration about the realization of the interfaces, so a detailed definition is needed to specify the behaviors of model, this paper will mainly focus on the structural integration.

C. Description of MRMI

In MRMI, a model is traded as a integration unit, which encapsulating a serious of algorithmics, executing, solutions etc. It is a group of class in software engineering, which assort with each other to achieve the design destination, so it canbe denoted by a “package”—a definition in software engineering, shown in figure2, the details of a model can be wrapped by package, the model with various of resolution canbe created by reveal the package’s detail content, at the same time, the public interfaces of model are also accessable, the name of model will be instead by the package name.

Figure 2. A package describes a Model

There two kinds of relationship among the packages, one is dependence, the other is generalization: dependence is import/export in semantic way, for example a package access other packages, generalization is used to specify the clanship among packages. The MRM has specific clanship in nature, so the import/export relationships need to be avoided for the flexible of models integration. In a word, the relationship of models in the MRMI is dependence, it is descripted as usage in semantic, as shown in figure3.

Figure 3. The description of Relationship amoung Models

The interfaces is defined as a collection of operation in UML, when use package to capsulate the models, the interfaces are collection of operation or the interface class. MRMI follows the UML to define the interfaces, the element of models also be assorted by public, private and protected. As shown in figure4.

Figure 4. The description of Interface of a Model

IV. THE INTEGRATION PROCESS OF MRMI

Here we define three phases of MRMI:analysis,design and refine.

Analysis phase: analysis the requirement of simulation

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and pick up the models that is possible to take part in the integration, then design the high hierarchy interfaces. Design phase: decompose the higher hierarchy models to a serious of lower hierarchy models, reveal the details of models, specify the integration relationship. Refine phase: it is a process of model operation to the integration framework, it will finaly create a solution of the integration.

In this integration methodology, the models are integrated from abstract level to detailed, every result of one phase is input of the next phase, this ensures every result can be rechecked and the validity of integration also be ensured. The process of MRMI as shown in figure 5.

A. The process of MRMI

Figure 5. Reference Model of the MRMI

V. CHARACTERS OF MRMI

Models created by MRMI has three virtues when integrate the MRM:

Hierarchical: the higher model descripts the top framework of integration, the top framework customs the interaction among the models, at the lower level, the higher integrated models reflect the interaction relationship of the submodels, at the lowest level, the detailed integrated models specify the detail of model integration. It is very important to the mass-distributed simulations for the models can be integrated without considerate the inner content of the models, with the reveal of the models, a whole solution of integration will be created.

Backward: a model in MRM is a container in nature, the sub models, classes, library are its content. According to the concepts of MRMI, the illusion in every level of integration can be backwarded by the sub models, classes, operations top-to-bottom or bottom-to-top.

Assemblable: In the framework of higher hiberarchy, the models clasped by the dependence relationship, the MRMI indicate its assemblility in every phase of integration.

VI. CONCLUSION

In this paper, aims to the problem of integrate the MRM in mass-distributed simulation, we present a methodology calld MRMI, discussed the base concepts of MRMI, defined the process of MRMI and its description methods, it is will helpful to the every level of distributed simulations.

The research on principium of MRMI was on the primary phase, the base concepts and integration process has been defined, there are a lot of issues need to be studied remain in the future, for example: the resolution of interfaces, the online-integration and tools of MRMI etc.

ACKNOWLEDGMENT

Liu Zhong is an Associate Professor of System Modeling and Simulation at Naval University of Engineering His current research interests include analysis of simulation models analysis of simulation models and distribute simulation

Gong Li is pursuing his doctorate in University of Naval Engineering. He holds a Master of Computer Science, Naval University of Engineering. His research interests include analysis of simulation models and distribute simulation.

Liu Gao-Feng is an Associate Professor of System Modeling and Simulation at Naval University of Engineering His current research interests include analysis of simulation models analysis of simulation models and distribute simulation

REFERENCES

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[3] W. Lu, K. Chiu, A. Slominski, and D. Gannon , “A streaming validation model for soap digital signature,” In 14th IEEE International Symposium on High Performance Distributed Computing , BeiJing, 2005, pp.18-24.

[4] KELTON D, “Experimental design for simulation[C] ,” Pro-ceedings of the 2000 Winter Simulation Conference. New Jersey, 2000, pp.32-38.

[5] KLEIJNEN, “Invited review: An overview of the design and analysis of simulation experiments for sensitivity analysis,” European Journal of Operational Research, vol.2, pp. 287-300, Jul. 2005.

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