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백병만(Byoung-Man Paik),이제훈(Jae-Hoon Lee),신동식(Dong-Sig Shin),이건상(Kun-Sang Lee) 한국레이저가공학회 2009 한국레이저가공학회지 Vol.12 No.4
The LDS(Laser Direct Structuring) process uses thermoplastic polymers with a additive compound that serves as plating seed after the activation by laser. It can realize industry requirement such as miniaturization of electrical component, design flexibility and reduction of production steps. The purpose of this study is to introduce LDS, and to investigate the fundamental mechanism. Also the characteristics of conductive patterns were investigated with respect to laser fluence and intensity. We have used a pulsed fiber laser (wavelength : 1064nm) and copper electroless plating to fabricate conductive patterns. The result showed that laser induced metal-organic complex was caused metalization by electroless copper plating, the critical laser fluence was 1.41 J/㎠ at a scan speed of 1 m/s.
백병산(Baek Byung-San),서광덕(Seo Kwang-Duk),김종구(Kim Jong-Koo) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper describes the capacity calculation of power supply system for Light Rail Transit. Three factors are considered for the design i.e. substation arrangements, line configuration and substation power capacity. In this study, we considered all of them for capacity calculation of power supply system for LRT. At first, DC-fed-traction system is introduced on an outline, a characteristics of train and fed network, and design method of substation arrangements. Optimal design procedures are described, and program for capacity calculation of the system is presented. In addition, the computer simulated results are compared with the conventional simple calculation method.
백병산,김용한 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.3
Recently, unusual transformer failures have been reported in 25kV power systems connected with a VCB and transformer. In this study, performance of the protection system, dielectric strength of the transformers, characteristics of switching surges and resonance phenomena were analysed and assessed. All investigations regarding the insulation breakdown of the transformers were carried out by simulations, laboratory tests, factory tests and on-site measurements in order to thoroughly investigate the root causes. Furthermore, experimental methods for investigating the resonance phenomenon were derived and tests were conducted applying the derived method to recreate the phenomenon in the transformer. It is found that resonance between the transformer and switching surge generated by closing a VCB can initiate the breakdown of internal windings of a transformer.