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Workgroup ATM System의 ATM NIC 25를 이용한 VoD System 설계에 관한 연구
송병철(Byoung Chul Song),용석진(Suk Jin Yong),조진웅(Jin Woong Cho),조위덕(We Duke Cho),동용배(Yong Bae Dong) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.2Ⅲ
본 논문은 workgroup ATM system에서 많은 사용이 예상되는 ATM 25Mbps급 네트워크 카드를 제작하고, 제작된 카드를 Windows NT OS를 사용하는 PC compatible 하드웨어를 통해 ATM switch에 접속시켜 테스트한 내용을 기술한다. 테스트는 멀티미디어 데이터 송수신 시험을 하는 현태로 이루어졌다. 시스템은 ATM Forum의 uni 3.1 signaling 소프트웨어를 이용하여, 드라이버 형태로 만들어서 사용하였고, 테스트는 상용 스위치를 이용하여 server & client 형태로 시험하였다. 또한 제작된 카드를 사용하여 native ATM service를 사용하는 VoD 시스템을 설계하였다. 실험적으로 만든 VoD 시스템을 통해 동영상 정보를 송수신하여 멀티미디어 서비슬 이용할 수 있는 설계 방법을 고찰하였고, 그 결과 ActivMovie를 이용하여 플레이어를 내장 시킨 형태의 VoD 시스템을 구현하였다.
라플라스 변환과 유한요소법의 결합에 의한 확산방정식의 해석
송병철(Byoung-Chul Song),이준호(Joon-Ho Lee),이기식(Ki-Sik Lee) 한국자기학회 1998 韓國磁氣學會誌 Vol.8 No.3
In this paper, a algorithm is proposed, which is applicable to the transient analysis of diffusion equations by combined use of the Laplace transform and the finite element method. The proposed method removes the time terms using the Laplace transform and then solves the associated equation with the finite element method. The solution which is solved at frequency domain is transformed into time domain by use of the Laplace inversion. To verify the proposed algorithm, a heat conduction problem is analysed. And the solution showed a good agreement with analytic solution. Because the time-step method is not needed, the proposed method is very useful in solving various kinds of diffusion equations.
민감도 해석을 이용한 로우어 컨트롤 암의 구조 최적설계
송병철(Byoung-Cheol Song),조영직(Young-Jik Jo),김주형(Ju-Hyoung Kim),이권희(Kwon-Hee Lee),박영철(Young-Chul Park) 한국기계가공학회 2008 한국기계가공학회지 Vol.7 No.1
Recently developed automotive components are of lightweight nature, providing automobiles with a high fuel efficiency and performance. In response to those trends of car developments, this study proposes a structural optimization method for the lower control ann. Lightweight design of lower control am can be achieved through two approaches: design and material technology. In this research, the former includes optimization technology, and the latter the technologies for selecting aluminum as a steel-substitute material. In this research, the design of experiments(DOE) built in ANSYS WORKBENCH are utilized to determine the optimum shape of a Lower Control Arm. And optimum design is compared first model and reduced design variable model that considered sensitivity using orthogonal array.
송병철(Byoung-Cheol Song),박한석(Han-Seok Park),권영민(Young-Min Kwon),박영철(Young-Chul Park),이권희(Kwon-Hee Lee) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
Recently developed automotive components are of lightweight nature, providing automobiles with a high fuel efficiency and performance. In response to those trends of car developments, this study proposes a structural optimization method for the lower control arm. Lightweight design of lower control arm can be achieved through two approaches: design and material technology. In this research, the former includes optimization technology, and the latter the technologies for selecting aluminum as a steel-substitute material. One of the goals in designing a control arm is to achieve the minimum weight under the constraints such as stiffness, strength, etc. At the initial proto design stage of a new control arm, strength and damage assessments are the commonly used design criteria. Considering the need for a prompt design recommendation in the proto design stage, it is desirable to utilize the FE (finite element) method, replacing the related tests in laboratory. This study considers the several service loads transmitted to the control arm. The inertia relief analysis for FE method is utilized to simulate the loading conditions. Optimum results are obtained by Kriging metamodel and ANSYS Workbench(DOE). In this research, optimum results which obtained by two methods are compared with each other.
열탄성 불안정성을 고려한 원주면 마찰형 디스크 브레이크의 구조설계
송병철(Byoung-Cheol Song),강동헌(Dong-Heon Kang),김영희(Young-Hee Kim),박영철(Young-Chul Park),이권희(Kwon-Hee Lee) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.3
Weight reduction for an automobile component has been sought to achieve fuel efficiency and energy conservation. In response to this trend, a new disc-brake called the circumferential friction disc-brake is suggested. This paper compares the mechanical performances of a conventional disc-brake and a suggested disc-brake, under the dynamic braking condition. The thermoelastic instability is considered to simulate the test condition. Furthermore, the metamodel using kriging interpolation method is introduced to obtain the optimum design of a suggested circumferential friction disc-brake. The design results obtained by the kriging method are compared with those obtained by the ANSYS.
민감도 해석을 이용한 로우어 컨트롤 암의 구조 최적설계
송병철(Byoung-Cheol Song),김세훈(Se-Hun Kim),강정호(Joung-Ho Kang),박영철(Young-Chul Park),이권희(Kwon-Hee Lee) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
Recently developed automotive components are of lightweight nature, providing automobiles with a high fuel efficiency and performance. In response to those trends of car developments, this study proposes a structural optimization method for the lower control arm. Lightweight design of lower control arm can be achieved through two approaches: design and material technology. In this research, the former includes optimization technology, and the latter the technologies for selecting aluminum as a steel-substitute material. In this research, the design of experiments(DOE) built in ANSYS WORKBENCH are utilized to determine the optimum shape of a Lower Control Arm. And optimum design is compared first model and reduced design variable model that considered sensitivity using orthogonal array.
강동헌(Dong-Heon Kang),송병철(Byoung-Cheol Song),박영철(Young-Chul Park),이권희(Kwon-Hee Lee) 한국기계가공학회 2008 한국기계가공학회지 Vol.7 No.2
Current trend of design technologies shows engineers to objectify or automate the given decision-making process. The numerical optimization is an example of such technologies. However, in numerical optimization, the uncertainties are uncontrollable to efficiently objectify or automate the process. To better manage these uncertainties, Taguchi method, reliability-based optimization and robust optimization are being used. Based on the independence axiom of axiomatic design theory that illustrates the relationship between desired specifications and design parameters, the designs can be classified into three types: uncoupled, decoupled and coupled. To best approach the target performance with the maximum robustness is one of the main functional requirements of a mechanical system. Most engineering designs are pertaining to either coupled or decoupled ones, but these designs cannot currently accomplish a real robustness thus a trade-off between performance and robustness has to be made. In this research, the game theory will be applied to optimize the trade-off.