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임중연(Lim Joong Yeon),유명열(Yu Myoung Youl),김종권(Jong-Kwon Kim),이현근(Hyun Geun Lee),김준석(Junseok Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In this presentation, we study numerically an optimization problem of a fire fighting robot cooling system. The governing equation for the system is the unsteady heat equation with source term. We use a multigrid method for numerical solutions in three-dimensional space. We investigated the effects of various parameters and the results will be presented.
폐목재(廢木材) 활용(活用)을 위한 플라즈마 처리(處理) 효과(效果)에 대한 연구(硏究)
김미미,임중연,Kim, MiMi,Lim, Joong Yeon 한국자원리싸이클링학회 2013 資源 리싸이클링 Vol.22 No.2
In this study, surface modification of wood powder by atmospheric pressure plasma treatment was investigated. The composites were manufactured using wood powder and polypropylene(wood powder : PP = 55 wt% : 45 wt%). Atmospheric pressure plasma was treated as condition of 3KV, $17{\pm}1$KHz, 2 g/min. Helium was used as carrier gas and monomer such as hexamethyl-disiloxane(HMDSO) was used to modify surface property by plasma polymerization. The tensile strength of untreated waste wood powder(W3) and homogeneous wood powder(H3) were about 18.5 MPa, 21.5 MPa while the tensile strength of plasma treated waste wood powder(PW3) and homogeneous wood powder(PH3) were about 21.2 MPa, 23.4 MPa, respectively. And tensile strength of W3 and H3 were improved by 14.6% and 8.8%, respectively. From the results for mechanical property, morphological analysis, we obtained improved interfacial bonding of polypropylene and wood powder modified by plasma treatment. 본 실험에서는 상압플라즈마에 의한 목분의 표면개질에 대해 조사하였다. 복합재는 목분과 폴리프로필렌을 이용하여 제작되었다(목분 : 폴리프로필렌=55wt% : 45wt%). 상압플라즈마는 carrier gas로 헬륨과 HMDSO를 모노머로 사용하였고 3 KV, $17{\pm}1$KHz, 2 g/min의 조건에서 처리하였다. 폐목분의 인장강도는 상압플라즈마 처리를 통해 18.5 MPa에서 21.2 MPa로 14.6% 증가하였고 단일수종목분의 경우에도 21.5 MPa에서 23.4 MPa로 8.8% 증가하였다. 이것으로 상압플라즈마 처리는 목분의 표면을 개질하여 폴리프로필렌과의 계면결합력을 증가시켜주는 것을 확인하였다.
이호용,임중연,정지윤,Lee Ho-Yong,Lim Joong-Yeon,Jung Ji-Youn 한국공학교육학회 1999 공학교육연구 Vol.2 No.1
본 연구는 가상 현실(virtual reality)을 활용하여 실제 고가의 실험장비를 구입하지 않고도 개인용 컴퓨터에서 인터넷상으로 가상적인 프레스를 이용한 압축실험을 할 수 있도록 하는 것이다. 가상압축실험의 구현은 인터넷을 통하여 세 개의 모듈 즉 입력, 계산, 결과로 나누어 계산되어진다. 입력모듈에서는 압축실험을 위하여 인터넷 사용자가 재료의 실험적인 특징을 입력하고 그 입력 값을 서버 컴퓨터로 보내주는 과정이며, 계산모듈은 서버 컴퓨터에 있는 시뮬레이션 해석프로그램을 이용하여 입력모듈의 입력 값을 받아들여 결과를 계산한 후 파일로 저장하는 과정이다. 결과모듈에서는 서버 컴퓨터에서 계산된 결과를 인터넷 사용자에게 도표와 그림 그리고 3차원 애니메이션을 보여주는 과정으로 되어있다. 이를 구현하기 위하여 인터넷의 언어인 HTML, CGI, VRML, JAVA를 사용하였으며, 유한요소법(FEM)을 이용한 해석프로그램은 포트란(Fortran) 언어로 제작되었다. 현재 인터넷상에서의 가상현실을 이용한 응용분야가 급속히 확대되므로 앞으로 공학적인 가상 실험에 관한 연구가 많이 이루어져 실제 실험을 대체할 것이다. This paper is concerned with the compression test such as compression and ring compression tests, by using virtual reality. Engineering material laboratory can be carried out on personal computer without the real expensive experiment devices. The virtual laboratory is composed of three modules as input, calculation and output module on internet. Internet user can give the material's property and other parameters to the server computer at the input module. On the calculation module, simulator cimputes the results by analysis program and store the data as a file. The output module is the program that internet user can confirm a virtual compression results by showing a table, graph, and 3D animation. This program is designed by Internet language such as HTML, CGI, VRML, JAVA. And analysis program uses the finite element method with fortran language. Since the study of virtual reality on internet is rapidly increasing, the virtual experiment of technique will substitute many real experiments in the future.
이호용(Ho Yong Lee),임중연(Joong-Yeon Lim),범형택(Hyoung Taek Bom) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
This study is concerned with the structural analysis of car seat frame by the finite element method. The load-deformation characteristics are simulated according to the test requirements of U.S(FMVSS). Three-dimensional modeling techque is applied to the components of seat frame and the shell, solid, gap elements are employed to model the car seat frame assembly. Numerical results show that the recliner and knuckle plate are identified as the possibie weak part of frame, and this results are well consistent with experimental ones.The current analysis model can provide useful informations to design a new car seat and can reduce the overall design cost and time.<br/>
고효율과 저소음 획득을 위한 의료용 핸드피스 설계 및 프로토 타입 제작을 통한 성능평가 비교 연구
김상훈(Sanghun Kim),임중연(Joong Yeon Lim),이호용(Ho Yong Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
High-speed air turbine dental handpiece is the most commonly used medical devices primarily for teeth cutting and machining are used in addition to orthopedics, dermatology, etc. Features of dental handpieces used 400,000 rpm and high torque required for cutting teeth. It is in need of improvement because a noise generated during the cutting teeth of the patient to feel fear and dentist for an extended period of time can lead to severe hearing loss for using dental handpiece. In this study, the assumption is a efficiency and noise of the dental handpiece associated the dental handpieces supply line shape. So I have 3D FEM analysis for the dental handpieces supply line shape and modifying design based on 3D FEM analysis data. And making a actual prototype for verification of the performance evaluation based on the FEM analysis results. Finally will compare 3D FEM analysis data and actual test data for verification of 3D FEM analysis.