• Proceedings of the Korea Multimedia Society Conference
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• 2001.11a
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• pp.563-568
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• 2001

본 연구에서는 3차원 그래픽 시뮬레이션 게임 제작 연구를 목적으로 하여 3차원 그래픽 전차모델을 제작하고 이를 이용한 전차전 시뮬레이션 게임 제작을 목표로 한다. 게임 상에는 아군과 대항군의 2대의 전차가 사용되며 대항군 전차는 통계적인 함수 모형을 이용하여 자체적인 전투 수행을 할 수 있도록 하고, 아군 전차는 사용자가 움직임을 통제한다. 본 논문의 결과를 사용자 탱크가 자유자재로 지형 위를 움직이며 상대편 탱크와 전투를 하는 시스템이 개발된다.

• Journal of The Korean Society of Agricultural Engineers
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• v.47 no.2
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• pp.35-44
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• 2005

While the need for analyzing and interpreting agricultural logistics are becoming more and more prominent with the rapid changes within the agricultural environment, previously mathematical models have been proved to have its limitations due to the unpredictable traits of agriculture itself and finding the adequate simulation model is not easy. Therefore, in this research, the tank model that has been used to analyze the rainfall-runoff in watersheds, was used to develop a logistics model for estimating shipment by agricultural production. The model was certified by wholesale market data of garlic.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.10a
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• pp.192-195
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• 2007

본 논문에서는 RF 모듈을 탐재한 Atmega 시스템 설계를 통한 잠수함 원격 제어 시스템을 구현한다. 본 연구에서 제작한 RC 잠수함은 실제 잠수함의 원리와 비슷하게 잠항을 할 때는 소형펌프로 밸러스트탱크에 물을 채우고, 잠수를 할 때 수직타와 추진력을 이용하여 잠항을 한다. 이와 반대로 부상은 소형펌프로 밸러스트탱크 안에 물을 배수하여 WTC(방수실린더)안의 기압과 수직타와 추진력을 이용하여 부상을 한다. RC 잠수함은 크게 외부와 내부 그리고 방수를 하기 위한 WTC(방수 실린더)로 나누어진다. 송신 부는 RF 모듈, MCU(Atmega128), 키패드, 캐릭터LCD로 구성되며 수신부는 MCU(Atmega128), RF 모듈, 제어장치들로 구성한다. 제어장치에는 모형 잠수함은 추진력을 위하여 DC 모터에 스크류(프로펠러)를 장착하고, 방향전환 및 잠항과 부상을 위하여 RC 서보 모터를 사용하고 잠항과 부상을 위하여 펌프를 사용한다. WTC는 방수실린더로서 아크릴파이프를 이용하여 제작하고 방수를 위하여 아크릴파이프를 이용 여기에 MCU와 제어 장치들을 넣어 밀봉시켜 방수를 하여 완성한다.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2011.04a
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• pp.531-538
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• 2011

To ensure the structural integrity of membrane type LNG tank, the rational assessment of impact pressure and structural responses due to sloshing should be preceded. The sloshing impact pressures acting on the insulation system of LNG tank are typical irregular loads and the structural responses caused by them also very complex behaviors including fluid structure interaction. So it is not easy to estimate them accurately and huge time consuming process would be necessary. In this research, a simplified method to analyze the dynamic structural responses of LNG tank insulation system under pressure time histories obtained by sloshing model test or numerical analysis was proposed. This technique basically based on the concept of linear combination of the triangular response functions which are obtained by the transient response analysis under the unit triangular impact pressure acting on structures in time domain. The validity of suggested method was verified through the example calculations and applied to the structural analysis of real Mark III type insulation system using the sloshing impact pressure time histories obtained by model test.

• Journal of Korea Water Resources Association
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• v.36 no.3 s.134
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• pp.423-436
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• 2003

The objective of this study is to propose an automatic parameter estimation scheme considering runoff components of Tank model. It estimates model parameters by Powell's automatic algorithm based on the runoff component separation of the observed hydrograph by using digital filter method. The selected study areas are the 4 main dam sites on the Han River. The simulated flows are compared with the observed flows depending on whether runoff component consideration or not. As a result, the estimated model parameters from classical Powell's method only can relatively well simulate the time variation of total runoff, but gives poor runoff component simulations. Therefore, it can be concluded that the proposed automatic parameter estimation scheme in this study Is more reliable and objective.

• Journal of Korea Water Resources Association
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• v.40 no.9
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• pp.687-696
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• 2007

Preference ordering approach is applied to optimize the parameters of Tank model using multi-objective genetic algorithm (MOGA). As more than three multi-objective functions are used in MOGA, too many non-dominated optimal solutions would be obtained thus the stakeholder hardly find the best optimal solution. In order to overcome this shortcomings of MOGA, preference ordering method is employed. The number of multi-objective functions in this study is 4 and a single Pareto-optimal solution, which is 2nd order efficiency and 3 degrees preference ordering, is chosen as the most preferred optimal solution. The comparison results among those from Powell method and SGA (simple genetic algorithm), which are single-objective function optimization, and NSGA-II, multi-objective optimization, show that the result from NSGA-II could be reasonalby accepted since the performance of NSGA-II is not deteriorated even though it is applied to the verification period which is totally different from the calibration period for parameter estimation.

• Magazine of the Korean Society of Agricultural Engineers
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• v.35 no.1
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• pp.50-58
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• 1993

The sedimentation patterns at a reservoir, important to the reservoir capacity curve were simulated using a depth averaged, two-dimensional sediment transport model, that is capable of depicting velocity distributions and sediment transportation. The Banweol reservoir, whose stage capacity relationships have been surveyed before and after the construction, was selected and the daily inflow rates and stages were simulated using a reservoir operation model(DI-ROM). The applicability of the transport model was tested from the comparisons of simulated sedimentation patterns to the surveyed results. The simulated inflow rates and water level fluctuations at the reservoir during twenty-one years from 1966 to 1986, showed that water levels exceeding 80 percent of the total capacity occurred for 70 percent of the periods and inflow rates less than 5000rn$^3$/day sustained for 54 percent of the spans. Dorminant flow directions were simulated from two streamflow inlets to the dam site. And simulated sediment concentrations were higher near the inlets and lower at the inside of the reservoir. Sediment was deposited heavily near the inlets, and portions of sediments were distributed along the flow paths within the reservoir. The comparisons between the simulation results and the surveyed depositions were partially matched. However, it was not possible to compare two results at the upper parts of the reservoir where dredging was carried out few times for the purpose of reservoir maintenance. This study demonstrates that sedimentation patterns within the reservoir are closely related to incoming sediment and flow rates, water level fluctuations, and flow circulation within the reservoir.

• Journal of the Korean Institute of Gas
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• v.26 no.6
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• pp.9-15
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• 2022

In order to verify the durability of the high-pressure hydrogen tank in the operating pressure range, a hydraulic rupture test should be performed. However, if the bubbles generated by the initial injection process of water are attached to the inner wall of the tank and remain, a sudden pressure change of the bubbles during the rupture of the pressurized tank may cause shock and noise. Therefore, in this study, the flow velocity required to remove the bubbles remaining on the inner wall of the tank was predicted through simplified formulas, and the shape of the injection nozzle to maintain the flow velocity was determined based on the shape of the hydrogen tank for the hydrogen bus. In addition, a numerical model was developed to predict the change in flow velocity according to the inlet pressure, and an experiment was performed through a model tank to prove the validity of the prediction result. As a result of the experiment, the flow velocity near the tank wall was similar to the predicted value of the analysis model, and when the inlet pressure was 1.5 to 5.5 bar, the minimum size of the removable bubble was predicted to be about 2.2 to 4.6 mm.

• 한국방재학회:학술대회논문집
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• 2010.02a
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• pp.52.2-52.2
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• 2010

본 연구에서는 자유수면의 계산을 위해 동수압을 해석하는 수치모형을 제시하였다. 동수압과 자유수면을 고려하기 위해, 비점성 Navier-Stokes 방정식을 3단계로 나누어 해석하였다. 제1단계에서는 동수압과 자유수면을 전번 시간단계에서 계산된 값으로 대입하여 차분하였으며 이 차분식은 NGMRES(Newton-Generalized Minimal Residual) 방법을 이용해 음해적으로 해석되었다. 이때 계산된 유속장은 연속방정식을 고려하지 않았으므로 각 계산격자에서 질량보존법칙을 만족하지 않을 수도 있다. 제2단계에서 유속과 동수압 보정항으로 이루어진 식을 연속방정식에 대입하여 얻어지는 타원형 방정식인 동수압-포와송 방정식을 해석하므로 여기서 얻어지는 유속은 질량보존법칙을 만족하게 된다. 마지막 3 단계에서는 자유수면과 최종 유속을 계산하였다. 새로 개발된 수치모형을 검증하기위해 정사각형 탱크에서 수면의 자유 진동 문제에 적용한 결과 수치해는 해석해와 잘 일치하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2017.11a
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• pp.130-131
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• 2017

부유체의 횡동요는 부유체의 안정성을 헤칠 뿐 아니라 승조원의 피로를 누적시키고, 기자재의 안정적인 운용과 수명에도 영향을 미친다. 본 연구에서는 점성감쇠 안티롤링진자를 이용하여 부유체의 횡동요를 줄이는 방법을 제안하고, 안티롤링진자의 효용성을 보인다. 약 1m, 7.7kg의 모형선에 32g, 40g, 50g의 안티롤링진자를 탑재하여 16%~23.5%의 롤링 저감 효과를 얻을 수 있었다.