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송재용(J. Y. Song),길경석(G. S. Kil),신광철(G. C. Shin),박종국(J. K. Park),심재원(J. W. Sim) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
In this study, a ubiquitous sensor for condition monitoring of insulators and lightning arresters installed in power distribution lines and electric traction vehicles is presented. The sensor consists of two parts; a leakage current measurement and a lightning surge detection. Measured data are transmitted to a supervisory computer through ZigBee protocol based on IEEE 802.15.4. To detect leakage current, a window type Mn-ZCT is used and a low-noise amplifier with a gain of 60 ㏈ is designed, and this can measure leakage current in ranges of 100 ㎂ ~ 5 ㎃. A sample-hold (S/H) and a Rogowski coil are injected to analyze the magnitude of surge current in ranges from 500 A to 10 ㎄ with 8/20 ㎲-waveform.
홍석무(S. M. Hong),황지훈(J. H. Hwang),심재원(J. W. Sim),정완진(W. J. Chung),전만수(M. S. Joun) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
In this paper, a three-dimensional elastoplastic finite element analysis is conducted to reveal the fracture occurring in plate forging of a clad plate. Formability limit diagram (FLD) technique is applied in the clad material which is thin enough for FLD technique to be applied. To obtain reliable predictions, special finite element mesh system is employed. The predictions are compared with experiments, showing that they are in good agreement with each other.
4각 딥드로잉 클래드판재 성형공정의 탄소성 유한요소해석
이민철(M. C. Lee),홍석무(S. M. Hong),황지훈(J. H. Hwang),심재원(J. W. Sim),이장호(J. H. Lee),정완진(W. J. Chung),전만수(M. S. Joun) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
In this paper, three-dimensional elastoplastic finite element approach to simulating a clad-metal sheet metal forming process is presented. The approach is based on a layered finite element mesh system with tetrahedral elements and a force imposing die to deal with blanking holder force. The predictions are compared with experiments, revealing that they are in a good agreement with each other.
전만수(M. S. Joun),이장호(J. H. Lee),김민철(M. C. Kim),황지훈(J. H. Hwang),심재원(J. W. Sim),홍석무(S. M. Hong) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10
In this paper, a two-dimensional finite element analysis model for rectangular clad plate drawing is proposed to examine its detailed plastic deformation. Three-dimensional behaviors of plastic deformation of clad plate are investigated using some finite element predictions and finite element predictions of its drawing process are qualitatively compared with the experiments. Based on the observations, a two-dimensional analysis model is proposed, which reveals that relatively thin clad material has little influence on history dependent variables including strain and damage. However, residual stress tends to concentrate very much on the clad material.
이종선(C. S. Lee),심재원(J. W. Sim),최주호(J. H. Choi),차인혁(I. H. Cha),정영근(Y. K. Jeong),안재용(J. Y. Ahn) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
A new pump used in arthroscopy surgery was developed. The pump is driven by pneumatic air compressor and controlled by a stepper motor connected to an air regulator. Pressure control performance was observed to be similar compared to commercially available artheroscopy pumps. However, pressure pulses observed in the commercial pumps driven by multiple rollers disappeared in the pneumatically driven pump. The new pump required containers to enclose and squeeze saline solution packs. A dramatic saving in manufacture cost is expected considering the simple pneumatic drive used in this pump.