• 한국CDE학회논문집
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• 제20권3호
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• pp.221-229
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• 2015

M&S (Modeling & Simulation) based design is widely accepted for the development of the future weapon system with better performance in a cheaper and faster way. Integrated simulation environment (ISE) is needed for the M&S based design. On the ISE, system engineers can not only verify design options but also validate system requirements. In this paper, we propose architectural models of the integrated simulation environment (ISE) which incorporates mission effectiveness M&S (Modeling & Simulation), system performance M&S, the optimization model of integrated performances, digital mockup and virtual prototype. The ISE architectural models may be used to implement the ISE for the development of the future unmanned ground combat vehicle.

• 한국시뮬레이션학회논문지
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• 제21권4호
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• pp.81-90
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• 2012

본 논문은 지상무기체계 교전을 모의하기 위한 시뮬레이션 시스템 구축에 관한 연구이다. 본 논문에서는 에이전트 시뮬레이션 설계 방법론에 기반하여 시뮬레이션 시스템 아키텍처를 제안한다. 제안된 아키텍처의 각 개체는 에이전트 기반으로 모듈화된 컴포넌트들을 조합하여 구성된다. 이와 같은 개체 구성 방법은 개체의 재사용성과 조합성을 향상시키고, 결과적으로 시뮬레이션 시스템의 개발에 투입되는 시간, 비용, 및 노력을 감소시킨다. 지상무기체계 교전의 모의는 환경의 영향을 반영하는 것이 매우 중요하다. 제안된 아키텍처의 합성전장환경은 전장의 환경 데이터를 가지며 시뮬레이션 시스템의 전투개체와 계속적으로 상호작용한다. 이러한 아키텍처를 기반으로 구축된 시뮬레이션 시스템은 목적에 따라 다양한 지상무기체계 교전 시나리오의 신속한 모의가 가능하고, 개체들의 행위 수행에 환경 영향이 반영되어 신뢰성 있는 시뮬레이션 결과를 도출할 수 있다. 본 논문은 제안된 아키텍처를 기반으로 예제 시스템을 구축하여 그 효용성을 증명하였다.

• 한국지진공학회논문집
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• 제25권6호
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• pp.233-240
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• 2021

The stochastic method is applied to simulate strong ground motions at seismic stations of seven metropolises in South Korea, creating an earthquake scenario based on the causative fault of the 2016 Gyeongju earthquake. Input parameters are established according to what has been revealed so far for the causative fault of the Gyeongju earthquake, while the ratio of differences in response spectra between observed and simulated strong ground motions is assumed to be an adjustment factor. The calculations confirm the applicability and reproducibility of strong ground motion simulations based on the relatively small bias in response spectra between observed and simulated strong ground motions. Based on this result, strong ground motions by a scenario earthquake on the causative fault of the Gyeongju earthquake with moment magnitude 6.5 are simulated, assuming that the ratios of its fault length to width are 2:1, 3:1, and 4:1. The results are similar to those of the empirical Green's function method. Although actual site response factors of seismic stations should be supplemented later, the simulated strong ground motions can be used as input data for developing ground motion prediction equations and input data for calculating the design response spectra of major facilities in South Korea.

• 한국지열·수열에너지학회논문집
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• 제16권1호
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• pp.17-25
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• 2020

Ground-coupled heat pump (GCHP) systems have become an efficient alternative to conventional cooling and heating methods due to their higher energy using efficiency. Although some experimental and simulation works related to performance analysis of GCHP systems for commercial buildings have been done, relatively little has been reported on the performance evaluation of GCHP systems for school buildings. The purpose of this simulation study is to evaluate the performance of a hypothetical GCHP system for a school building in Seoul. We collected various data of building specifications and construction materials for the building and then modeled to calculate hourly building loads with SketchuUp and TRNSYS V17. In addition, we used GLD (Ground Loop Design) V2016, a GCHP system design and simulation software, to design the GCHP system for the building and to simulate temperature of circulating water in ground heat exchanger. The variation of entering source temperature (EST) into the system was calculated with different prediction time and then each result was compared. For 20 years of prediction time, EST for baseline design (Case A) based on the hourly simulation results were outranged from the design criteria.

• 한국자동차공학회논문집
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• 제10권1호
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• pp.195-202
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• 2002

By using modeling and simulation. today's design engineers are simultaneously reducing time to market and decreasing the cost of development, while increasing the quality and reliability of their products. A driving simulator is the best example of this method and allows virtual designs of control systems, electronic systems, mechanical systems and hydraulic system of a vehicle to be evaluated before costly prototyping. The objective of this Paper is to develop the virtual Proving: ground using a driving simulator and to show its capabilities of an automotive system development tool. For this purpose, including a real-time vehicle dynamics analysis system, the PC-based driving simulator and the virtual proving ground are developed by using VR(Virtual Reality) techniques. Also ABS HIL(Hardware-In-the-Loop ) simulation is performed successfully.

• Structural Engineering and Mechanics
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• 제66권1호
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• pp.75-84
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• 2018

This study presents the reliability-based analysis of nonlinear structures using the analytical fragility curves excited by random earthquake loads. The stochastic method of ground motion simulation is combined with the random vibration theory to compute structural failure probability. The formulation of structural failure probability using random vibration theory, based on only the frequency information of the excitation, provides an important basis for structural analysis in places where there is a lack of sufficient recorded ground motions. The importance of frequency content of ground motions on probability of structural failure is studied for different levels of the nonlinear behavior of structures. The set of simulated ground motion for this study is based on the results of probabilistic seismic hazard analysis. It is demonstrated that the scenario events identified by the seismic risk differ from those obtained by the disaggregation of seismic hazard. The validity of the presented procedure is evaluated by Monte-Carlo simulation.

• 신재생에너지
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• 제10권3호
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• pp.6-13
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• 2014

This paper presents a computational study of thermal performance and construction cost of horizontal ground heat exchangers (GHEs). GLD (ground loop design) simulations of various type of GHEs were carried out. Construction costs were also calculated based on standard estimating, and compared with vertical type GHE system. Besides that, dummy regression analysis was conducted to study the influence of design parameters on the simulation results in horizontal ground heat exchanger system.

• 한국해양공학회지
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• 제12권2호통권28호
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• pp.87-96
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• 1998

A numerical simulation was done to investigate the performance of thin wings in close vicinity to ground. The simulation is based on Vortex Lattice Method(VLM) and freely deforming wake elements are taken into account for a sudden acceleration case. The parameters covered in the simulation are angle of attack, aspect ratio, ground clearance, sweep angle and taper ratio. In addition, the effect of the wing endplate on the ground effect is included. The wing sections used for present computations are uncambered, cambered and S-types. The present computational results are compared with other published computational results and experimental data.

• 대한원격탐사학회지
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• 제25권2호
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• pp.107-112
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• 2009

본 연구에서는 원형레일 기반의 지상 SAR 시스템에 대한 Forward Modeling 기법을 개발하였다. 이는 기존의 선형 레일을 이용하는 지상 SAR 시스템의 응용성 확대를 위해 원형레일 기반의 지상 SAR 시스템을 개발하고자 하는 연구의 일환으로 이루어졌다. Point targets를 대상으로 선형 레일을 따라 움직이는 안테나에 대한 시뮬레이션을 통해 얻어진 SAR raw signal 자료에 대하여 Deramp FFT 기법을 이용한 기존의 지상 Linear SAR 영상화 처리 알고리즘을 적용한 결과, 대상체에 대한 정확한 영상이 얻어지고 있어 본 연구에서 개발된 시뮬레이션 기술이 정확한 raw signal을 생성하고 있음을 확인하였다. 본 연구 결과는 현재 원형 레일을 플랫폼으로 하여 안테나를 이동시키며 얻어지는 지상 SAR 자료의 영상화 처리 알고리즘 개발 및 검증에 활용되고 있으며, 다양한 응용목적에 따른 최적의 지상 SAR 자료획득 및 운용체계의 설계를 위해서도 활용될 수 있을 것으로 기대된다.

• 한국지열·수열에너지학회논문집
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• 제15권2호
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• pp.1-9
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• 2019

In a ground-source heat pump (GSHP) system, a vertical ground heat exchanger (GHE) is widely accepted due to a higher thermal performance. In the vertical GHE, grout (also called grouting material) plays an important role in the heat transfer performance and the initial installation cost of the GHE. Bentonite-based grout has been used in practice because of its high swelling potential and low hydraulic conductivity. This study evaluated the thermo-physical properties of the bentonite-based grouts through lab-scale measurements. In addition, we conducted performance simulation to analyze the effect of mixed ratio of grouts on the design length and thermal performance of the vertical GHE. The simulation results show that thermally-enhanced grouts improve the heat transfer performance of the vertical GHE and thus reduce the design length of GHE pipe.