• 한국국방경영분석학회지
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• 제31권1호
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• pp.42-57
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• 2005

Korea DM&S(Defence Modeling & Simulation) development plan includes construction of a distributed simulation model which enables us to construct, operate, integrate and connect war game simulations. US DoD and IEEE set the HLA/RTI as the standard of distributed simulation model. HLA/RTI models each simulator as a Federate and group of them as a Federation. Simulation with the model shows interoperability and finally executes a war game simulation. Because of different resolutions and features, it is not satisfied 'interoperability' and 'reusability' of simulation perfectly MRM (Multi Resolution Modeling) has been introduced, and many developed countries including the United States have studied the technology to simulate the model with different resolutions. This thesis proposes the need for introduction of MRM and analyzes both technical and operational validity when we apply MRM model to army war game simulations. For these purposes, we 1) find MRM main issues with the study about MRM basic concepts and case studies of MRM's applications, 2) present the need of MRM and its relation with DM&S development plan, and 3) analyze its technical and operational validity when we apply MRM to an example, CHANG-JO21 and JEON-TOO21.

• 한국전자파학회논문지
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• 제24권5호
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• pp.558-565
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• 2013

본 논문에서는 고해상도 광대역 영상레이더의 성능을 분석하기 위하여 시간, 주파수 및 Numeric 영역에서 아날로그, RF 및 디지털 신호처리 해석을 통합할 수 있는 시스템 시뮬레이션 툴인 Agilent사의 ADS Ptolemy DF(TSDF: Timed Synchronous DataFlow)를 이용하여 모델링 및 시뮬레이션을 수행하였다. 영상레이더용 하드웨어 시스템은 안테나, 통제장치 및 송수신 장치로 크게 구성되며, 송수신 장치는 고주파 변환 장치, 고출력 송신 장치, 그리고 송수신 전단 장치로 구성된다. 본 논문에서는 시스템의 하드웨어 성능에 영향을 미치는 오차 변수를 정의하고, 이들 오차 변수의 오차 원인이 되는 부품에 대한 특성을 모델링하였다. 영상레이더는 TSDF 모델링 기법을 이용하여 순방향 전송 임펄스 특성($S_{21}$), 고주파 소자의 비선형 특성(이득 비선형, 3차 intercept 및 믹서 교차변조), 채널간 전파 특성, 주파수 합성기 위상 잡음, TWTA의 진폭/위상 특성, 파형 발생기의 샘플링 주파수 및 I/Q 밸런스 등에 대한 모델링을 수행하여 SAR 성능을 분석하였으며, 최종 임펄스 응답 특성 분석을 통한 시스템의 하드웨어 규격을 도출하였다.

• Journal of the Optical Society of Korea
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• 제19권5호
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• pp.444-448
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• 2015

We describe the radiative transfer of a Gaussian beam in a water medium using the Monte Carlo method offering basic propagation behaviors. The simulation shows how the energy of the initial Gaussian beam is redistributed as it propagates in coastal water, and also depicts the dependence of the propagation behavior on inherent optical properties of the ocean water such as the single scattering albedo as well as on laser beam parameters, e.g. the M squared. Our results may widen the applicability of LIDARs by providing a couple of design considerations for a bathymetric LIDAR.

• 한국군사과학기술학회지
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• 제15권6호
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• pp.754-760
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• 2012

To improve the efficiency and economics of national defence, the needs for defence M&S systems are greatly increased, but the lack of interoperability and reusability lowers the level of reliability in the existing simulations models. Recently, many research activities have been performed and some conceptual models, such as CMMS, DCMF, and KAMA, were introduced. However, these models don't support the whole process of defence M&S system development nor provide integrated domain knowledge and up-to-date data. In this paper, we analyzed the analysts' guidances and doctrines, which are the basic ingredients for the simulation system development, and proposed a systematic structure for all the defence M&S stakeholders to share the standardized domain knowledge, modeling algorithm and data. This will be a logical bridge between Mission Space and Simulation Space, and provide substantial data sets to build simulation systems.

• 한국CDE학회논문집
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• 제19권4호
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• pp.316-323
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• 2014

This paper proposes the 3D modeling and simulation technique for predicting the integrated performance of combat vehicle. To consider the practical driving and firing condition of a combat vehicle, the full vehicle model, which can define the six degrees-of-freedom of vehicle motion and various firing angles, is developed. The critical design parameters such as the stiffness and damping coefficient of suspension system are applied to construct the analysis model of vehicle. A simple ballistic model, which incorporates the empirical interior ballistic model and the point mass trajectory model, is built to estimate the firing range and the firing recoil force. To predict the integrated performance and analyze the effect of system parameters, MATLAB/SIM-ULINK model of a combat vehicle for performing the real time simulation is also developed. Several simulation tests incorporating the road bump and the firing recoil force are presented to confirm the effectiveness of the proposed vehicle model.

• 한국국방경영분석학회지
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• 제27권2호
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• pp.134-148
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• 2001

In this paper, air-defense simulation model, called "DADSim", will be introduced. DADSim(Distributed Air Defense Simulation Model) was developed by Modeling&Simulation Lab of K.N.D.U.(Korea National Defence Univ) Weapon Systems Department. This model is an analysis-purpose model in the engagement-level. DADSim can simulate not only the global air-defense or Korean Peninsula but also the local air-defense or a battle field. DADSim uses the DTED(digital terrain elevation data) LeveII it for the representation of peninsula terrain characteristics. The weapon systems cooperated in the model are low/medium-range missile systems such as HAWK, NIKE, SAM. DADSim was designed in the way of object-oriented development method, implemented by C++ language. The simulation view is an event-sequenced object-orientation. For the convenience of input, output analysis, GUI(Graphic User Interface) of menu, window, dialog box, etc. are provided to the user, For the execution of DADSim, Silicon Graphic IRIX 6.3 or high version is required. DADSim can be used for the effectiveness analysis of­defence systems. Some illustrative examples will be shown in this paper.

• 한국산학기술학회논문지
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• 제12권8호
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• pp.3492-3496
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• 2011

우리나라의 국방 분야에서 모델링 및 시뮬레이션의 수준은 외국에 비해 상당히 저조하며, 무기체계의 연구 개발과 획득에서 신뢰성 부분을 해결하지 못하고 있는 실정이다. 따라서 본 연구에서는 전산유체역학을 이용하여 M&S를 공학적인 차원에서 모델링과 시뮬레이션의 적용 가능성을 제시하고, 향후 효과적인 무기체계의 연구개발과 획득에 적극 활용하고자 한다.

• 전기학회논문지
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• 제62권12호
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• pp.1725-1729
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• 2013

In this paper, the modeling and simulation of infrared absorption in an infrared absorbing structure with the cascaded transmission line model were carried out. Each layer in the infrared absorbing structure can be modeled as a characteristic impedance of the cascaded transmission line model. The simulation results show that the cavity thickness to get a maximum absorption should be less than a quarter wavelength, which is somewhat different from prevalent thickness. It can be assured that the sheet resistance of an absorbing layer to get a maximum absorption is $377{\Omega}/{\square}$, that the thickness of the absorbing layer dose not affect the spectral characteristics of absorption. It is also shown that the thickness of the active layer is not critical to the IR absorption. It can also be assured that the validation of this modeling is proved in comparison with the previous results from similar absorbing structures.

• 한국시뮬레이션학회논문지
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• 제24권4호
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• pp.59-68
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• 2015

본 논문에서는 전투 시스템 중 대표적인 지상 공격 수단인 전차를 대상으로 모델링 및 시뮬레이션 기법을 적용한 취약성 분석 방법에 관한 내용을 다룬다. SES/MB(System Entity Structure/ Model Base) 프레임워크는 복잡한 시스템의 구조를 계층적으로 표현할 수 있으며, 다양한 부품으로 구성된 전차를 모델링하기에 용이하다. 전차의 취약성은 전차가 위협탄에 의해 피격되었을 때, 장갑 및 부품이 파손되거나 관통된 것을 기준으로 분석할 수 있으며 관통 여부는 관통 해석식을 통해 위협탄의 관통 성능과 장갑 및 부품의 방호 성능을 비교한 결과에 따라 결정된다. 방호 성능은 일반 부품과 장갑으로 분류한 전차의 부품 종류 및 정의한 속성에 따라 결정되고, 모든 부품은 중요도를 산정하기 위한 가중치를 가진다. 전차의 취약성을 분석하기 위해 개발한 시뮬레이션 프로그램에서는 위협탄에 의해 관통된 부품 및 피해를 입은 부품의 중요도를 기반으로 하여 전체 취약성을 분석하고, 개별 부품이 전차에서 담당하는 기능을 정의하여 기능별 피해 기준에 따라 취약성을 분석한다.

• 디지털융복합연구
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• 제4권1호
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• pp.17-30
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• 2006

Recently, Modeling and Simulation, which have been received attention in various in dustries such as national defence, eduction and entertainment, have been researched, and related applications have been developed actively. Especially, it is focused on the to chnology of a virtual reality and a virtual simulation which represents the implementation technology for the simulation education related to the e-Learning industry. However, a solution is needed to fulfill the lack of technology and research about standardize d data elements which could be applied to virtual simulation technologies in common. Therefore, this article suggests the virtual simulation data elements to increase the educational effect of a virtual simulation and interoperability of data among LMS through reference to korean and international standards and the result of related area analysis. In other words, this article aims to define the expression of data element and to propose the guideline elements in the virtual simulation scope.