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DVR 모니터의 동특성 향상을 위한 구조 개선에 관한 연구
김건형(Geon-Hyeong Kim),이원규(Won-Koo Lee),이태훈(Tae-Hoon Lee),노승훈(Seung-Hoon Ro),정평수(Pyeong-Soo Jeong) 한국산업융합학회 2010 한국산업융합학회 논문집 Vol.13 No.2
Structural vibrations are among the biggest concerns in developing high resolution DVR(Digital Video Recorder) monitors. The vibrations in DVR monitors are mostly originated from the excitation sources such as the HDD and the cooling fan. In this study, the vibrations generated from the excitation sources were investigated in order to analyze the individual effect on the structural vibrations of the monitors and further to establish the design alteration to suppress the vibrations for the stability of the structure and for the better quality of the screen. The result shows that relatively simple design alterations can improve the stability of the structure substantially.
3차원 확장유한요소를 사용한 철근콘크리트 휨 부재의 다중균열 해석
김한수(Kim, Han-Soo),김건형(Kim, Geon-Hyeong) 대한건축학회 2017 大韓建築學會論文集 : 構造系 Vol.33 No.1
In this paper, the extended finite element method (XFEM) is used to simulate a crack initiation and propagation and to predict post-failure behavior of reinforced concrete flexural members. The reinforced concrete beams modeled by 2-dimension plane element and 3-dimension solid element are compared with the result of RC beam experiments. The analysis results of 2D and 3D XFEM elements are similar to experimental results. It confirmed the validity of the use of the 3D XFEM model for the analysis of RC flexural members. In this process, the locking phenomenon in enriched degree of freedoms was detected. The ways to prevent the locking phenomenon are presented; reducing the time increments or the tolerance of fracture criterion. Subsequently, a reinforced concrete slab modeled by 3-dimensional XFEM was analyzed and compared with the result of a RC slab test as well as the analysis with concrete damaged plasticity (CDP) model which can represent realistic post-failure behavior of concrete. The analysis with XFEM showed a similar load capacity and crack propagation patterns. The validity of 3D XFEM to predict crack patterns and post-failure behavior of RC members was demonstrated.
소프트웨어의 모듈평가척도와 모듈테스트 시간할당에의 응용
이창훈,김건형,Lee Chang-Hun,Kim Geon-Hyeong 한국국방경영분석학회 1990 한국국방경영분석학회지 Vol.16 No.1
This paper presents an allocation model of test times of software modules. An evaluation measure of modules which is based on the data flow path between modules is used at test phase. An evaluation measure is expressed by the possible path number of data flow for each module, which can be interpreted as an importance of individual module. Three criteria : module test time, module reliability, and system reliability is considered in this model. Multi-objective programming, hence, is used to solve this model.