• Journal of the Society of Naval Architects of Korea
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• v.31 no.4
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• pp.99-108
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• 1994

As a consequent result of our previous paper, "Development of Automatic Data Generation Program for Finite Element Structural Analysis of Oil Tankers"[1], the objective of this paper is to develop an automatic modeling program for the three-dimensional finite element structural analysis of hull modules of general commercial ships, especially oil tankers, bulk carriers, and container ships. Based on the proposed algorithm in [1], the followings are newly added: general applicability for three ship types, automatic mesh division interface with MSC/NASTRAN, direct wave load calculation interface, and Graphic User Interface technology in the process of input data preparation. The usefulness of this procedure is verified by calculation examples. examples.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.3
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• pp.718-723
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• 2017

When structural analysis modelling methods of practical fields are investigated, a slab is generally modeled by a finite element mesh using plate elements and a shear wall is modeled using a shell element or wall element for 3-D structural analysis. The point worthy of notice in this practice is that a shear wall is modelled using only one wall or shell element divided by floors and column lines to produce structural models. The modeling method like this can cause analysis errors according to the type of computer programs in use, and these errors reduce the reliability of the analysis results. Therefore, to secure the reliability of structural analysis, studies of the causes of errors and finding reasonable modeling methods are necessary. In this study, the causes of analysis errors according to the modelling methods of a shear wall, which are used in practical fields, were investigated and some considering matters for modelling a shear wall are presented to reduce the analysis errors on these analysis results.

• Bulletin of the Korea Photovoltaic Society
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• v.6 no.2
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• pp.7-14
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• 2020

육상태양광 발전원의 단점을 보완하기 위한 수단으로 유휴수면 활용 및 발전량 증대 등의 장점을 앞세우며 수상태양광 발전시스템이 대두되었으나, 설치면적 축소 등의 민원이 지속적으로 제기되며 한국환경정책평가연구원(KEI)에서도 설치면적에 대한 가이드라인이 필요함을 제시하기에 이르렀다. 이에 본 논문에서는 수상태양광 설치 시 제한된 설치면적 내에서 설치용량 및 발전량을 증가시킬 수 있는 새로운 수상 태양광 발전시스템 방법론을 제안하여, 국토의 효율적 및 친환경적 이용으로 「재생에너지 3020 이행계획」을 달성하면서 주민수용성을 증대시킬 수 있는 방안을 모색하고자 한다. 상주 수상태양광 오태2발전소를 대상지로 선정하여 현재 정남향(0°)으로 배치되어 있는 모듈을 기준으로 동일한 모듈 경사각이지만 동서방향(±90°)으로 모듈 방위각을 변경하여 배치한 경우의 비교 분석 연구 결과, 모듈 남향 배치 대비 동서방향 배치 시 설치용량은 13.25%, 발전량은 4.03%가 각각 증가하는 결과를 보였다. 본 연구에는 Sketchup Software를 통한 3D 모델링 및 PVSyst 프로그램을 이용하여 시뮬레이션 비교 분석을 진행하였다.

• Journal of Power System Engineering
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• v.13 no.5
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• pp.46-51
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• 2009

Recently, the shock resistance and dynamic characteristics of hard disk drives have become more important due to their highly increased storage density and miniaturization. In this study, we have developed an ANSYS/Mechanical/LS-DYNA based HDD vibration/shock simulation tool for design engineers. This simulation tool using ANSYS APDL can produce a parametric finite element modeling of HDD automatically and has GUI-based applications using the script program language Tcl/Tk. In the present tool, we adopt the reliable methodology of vibration/shock simulation, which is experimentally verified. It is expected that this simulation tool can make the repetitive computational efforts for the shock-proof design of HDD drastically reduced.

• Journal of the Korea Institute of Military Science and Technology
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• v.2 no.2
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• pp.209-217
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• 1999

In this paper, an integrated S/W system from CAD to optimal design has been suggested and an application to a precision machine tool structure shown. The integrated system is so designed to reduce manual interfacing effort. An object-oriented programming language is used for combining 3-D CAD program, FEM and optimal design tools. In this system parametric modelling technique is applied and users can get the optimum design iteratively without much user intervention. The CAD model is automatically updated when the design parameters are transferred back to the CAD program. Not only design time can be dramatically reduced but unnecessary operation errors avoided by the integration.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2018.06a
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• pp.107-109
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• 2018

지상파 UHD 방송을 위해 과학기술정보통신부는 UHD 방송장비의 국산화를 위한 R&D 사업을 UHD 워크플로우 전반에 걸쳐 추진한 바 있다. KBS와 RAPA는 국산 UHD 방송장비로 구성된 UHD 라이브 워크플로우의 시연 및 정합시험을 위한 시연용 테스트베드를 기획 및 제작하였다. 전체 시스템은 뉴스 및 토크쇼 형태의 시연 영상 연출을 위한 미니 스튜디오, 비디오 및 오디오 믹서, CG, 서버 등으로 구성된 부조정실, ATSC 3.0 시그널링 서버 등 송출시스템, 익사이터를 통한 송신 그리고 모바일 수신 단말을 통한 수신 시스템 등 실제 지상파 방송 송출 시스템을 모델링하여 테스트베드 형태로 구성된다. 본 논문은 시연 테스트베드 각 부분의 기획의도 및 구체적인 설계 방안의 제시를 통해 소규모 UHD 방송 스튜디오 등 워크플로우의 구성에 대한 이해를 돕고 아울러 상호운영성 검증 방안 들을 제시한다. 구현된 테스트베드는 방송기술인연합회와 공동으로 KOBA 2018 전시회에서 구축되어 전시기간 동안 전시회를 홍보하는 방송 프로그램 제작에 활용되었다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.437-438
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• 2021

본 논문에서는 SW중심사회로 나아감에 따라 SW와 관련된 진로에 대한 지향도를 높이기 위해 디지컬 테크놀로지를 활용한 직업 체험의 효과성을 검증하고 시사점을 도출해낸다. 다양한 직업인이 되어 인공지능, 사물인터넷, 빅데이터, 3D모델링, 가상현실 등 디지털 테크놀로지를 활용한 직업 체험을 경험한 학생들은 향상된 SW진로 지향도를 보인다. SW진로에 대한 선호도, SW교육에 대한 선호도, SW진로교육에 대한 필요성 인식, SW진로에 대한 정보제공의 필요성 인식이 모두 증가하였고, 이처럼 SW진로지향도를 높이기 위해서는 직업과 연계한 디지컬 테크놀로지 교육이 활발히 이뤄져야 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.3
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• pp.1022-1026
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• 2013

Recently, the waste heat recovery technique using thermoelectric generator (TEG) in automotive engine has emerged to improve thermal efficiency in commercial vehicle. It is not difficult to recognize the numerous attempts that have been made to develop the TEG simulation model, but it is hard to find the model in conjunction with a particular heat engine system. In this study, 1-D commercial software AMESim was used to develop a computational model that can assess waste heat recovery from a diesel engine exhaust using TEG. The developed TEG simulation model can be used for evaluating the TEG performance of various types of TE module, and the diesel engine model can simulate any type of on and off-road diesel engines. The simulation results demonstrated that approximately 544.75W could be recovered from the engine exhaust and 40.4W could be directly converted into electricity using one TE module. The models developed in this study can be easily coupled with each other in the same computational program; thus, the models are expected to provide a viable tool for developing and optimizing a TEG waste heat recovery system in an automotive diesel engine.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2011.04a
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• pp.144-152
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• 2011

In order to investigate the operation performance behaviors of the UAV's propulsion system to be operated long time in high altitude, the engine performance tests, which are simulated in the altitude engine test facility should be needed. If the test is performed in a existing altitude engine test facility, additional test apparatuses are required. Among them a proper design of the inlet and exhaust ducts that may directly affect the engine performance is very important. If the design is not adequate, the engine performance loss due to the flow behavior change and the pressure loss may be not similar to the real engine performance. In this work, firstly the engine inlet and exhaust ducts to be mounted to the existing altitude facility are modelled in 3D and its flow behaviors and pressure losses are analyzed using a commercial CFD tool, ANSYS's CFX, and the engine performance with the duct losses is calculated using the performance analysis program developed by C. Kong et al. Finally, the optimized inlet and exhaust ducts' configurations are proposed through the repeated analyses of various duct configurations.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.2
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• pp.655-661
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• 2019

This study examined the change in driving performance according to the starting position of the rear diffuser of a vehicle. To accomplish this, the CATIA 3D design program was used to model the vehicle with reference to a commercial SUV vehicle and design the rear diffuser to start from 300, 400, and 500 mm from the rear tire. The flow and drag change were analyzed and the change in air flow was confirmed using Fluent, a flow analysis program at a vehicle traveling speed of 60, 100, and 140 km/h. The rear diffuser reduced the lift and drag forces compared to no diffuser regardless of the starting position. This is because if there is a rear diffuser, it will reduce the vortex phenomenon by suppressing the flow separation that occurs when air is drawn out from the rear portion of the vehicle. In this study, the starting point SP 400 was determined to be the optimal condition because the lift force was the smallest at SP 400 and the lift reduction effect was the best.