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박경원(K. W. Park),이창면(C. M. Lee),이광복(K. B. Lee),이재철(J. C. Lee) 한국소성·가공학회 2008 소성가공 : 한국소성가공학회지 Vol.17 No.7
This study demonstrates that preloading via the elastostatic compression imposed on amorphous alloys at room temperature induces homogeneous plastic strain associated with structural disordering. This structural disordering causes disorder, which at room temperature creates excess free volume and in turn enhances the plasticity. In this study, we investigated the effects of various parameters, such as stress level, flow rate and preloading time, on the degree of the structural disordering at room temperature. On the basis of the present findings, we proposed a method of enhancing the plasticity of amorphous alloys.
박경원(K.W. Park),김영철(Y.C. Kim),김준홍(J.H. Kim),서기영(K.Y. Su),고희석(H.S. Koh),이현우(H.W. Lee) 한국조명·전기설비학회 1997 한국조명·전기설비학회 학술대회논문집 Vol.1997 No.-
Power conversion system must be increased switching frequency in order to achieve a small size a light weight and a low noise. However, the switches of converter are subjected to high switching power losses and switching stresses. As a result of those, the power system brings on a low efficiency. In this paper, the authors propose a DC-DC boost converter of high power by partial resonant switch method (PRSM). The switching devices in a proposed circuit are operated with soft switching and the control technique of those is simplified for switch to drive in constant duty cycle. The partial resonant circuit makes use of a inductor using step up and a condenser of loss-less snubber. Also the circuit has a merit which is taken to increase of efficiency, as it makes to a regeneration at input source of accumulated energy in snubber condenser without loss of snubber in conventional circuit. The result is that the switching loss is very low and the efficiency of system is high. The proposed converter is deemed the most suitable for high power applications where the power switching devices are used.