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이현구(H.G. Lee),하태현(T.H. Ha),하윤철(Y.C. Ha),배정효(J.H. Bae),김대경(D.K. Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
There are a number of reported instances of actual pipeline rupture during power line faults caused by melting of the pipe wall. This type of hazard was considered to be among the most serious of AC effects on pipelines in an international survey, comparable to the personnel safety hazard, Moreover, resistance coupling is not only a risk when the pipeline parallels a power line but also when they cross. One method of minimizing the effects of resistive coupling is by maintaining an appropriate separation distance between the pipeline and tower. This paper investigate the experiment for separation distance between the powerline earth and pipelines.
이현구(H.G. Lee),이영문(Y.M. Lee),앙승한(S.H. Yang),배대원(D.W. Bae),김학균(H.K. Kim) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.5
As a new approach to analyze grinding energy, this paper introduces a specific grinding energy model based on the average grain. Using this model, grinding characteristics such as specific grinding energy of SM45C were investigated with changing variables such as grain size, workpiece velocity(v) and apparent depth of cut(Z) in down-surface grinding. From the experimental results, the specific grinding energy decreases as the maximum undeformed chip thickness increases. And also the specific grinding energy increases as the grit size increases.
이현구(H.G. Lee),이영문(Y.M. Lee),배대원(D.W. Bae),장준호(J.H. Jang),황근식(K.S. Hwang),손성필(S.P. Son) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.10
As a new approach to analyze grinding energy, this paper introduces a specific grinding energy model based on the average grain. Using this model, grinding characteristics such as specific grinding energy of hardened SM45C steel were investigated with changing variables such as grain size, workpiece velocity( v) and apparent depth of cut(Z) in down-surface grinding. From the experimental results, the specific grinding energy decreases as the maximum undeformed chip thickness increases.
이현구(H.G. Lee),하윤철(Y.C. Ha),하태현(T.H. Ha),최정희(J.H. Choi),김대경(D.K. Kim),배정효(J.H. Bae) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.10
Current of DC traction systems flows from the positive busbar of the substation, through the overhead contact system, to the vehicle, and returns through the running rails. Because the rails are not very effectively insulated from the earth a certain amount of current flows into the earth, especially in the area near the load and depots. At the place where the stray current leaves the rail and pipe, corrosion may take place. In this paper we introduce the electrolytic corrosion protection methods of depots using silicon rectifier for the rail.