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유호천,Yoo, Ho-Cheon 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.1
Recent developing tendency of overlay welding on welding methods are studied by searching of NDSL, ScienceDirect and KIPRIS. PTA, Laser cladding, SMAW, GTAW, GMAW, SAW and ESW are selected as welding methods. Development and improvement of various new overlay welding processes and technology are introduced, especially PTA and Laser cladding in abroad overlay welding technology are activated substantially.
유호천,이영아 대한건축학회 1999 대한건축학회논문집 Vol.15 No.3
Noise is the most serious of complaints concerning buildings Multimedia lecture rooms can exhibit a drop m the quality of sound environmental performance because there are many kinds of machines and they make an abundance of noise. In this study we will measure the noise level of the equipment in multimedia lecture rooms such as PC, OHP, scanner, printer and will evaluate indoor sound environmental performance that ha:, been influenced by the noise of multimedia lecture room machines Sound environmental performance can be measured by analyzing noise level, reverberation time and sound insulation performance The results of analysis on the sound environmental performance m a multimedia lecture room will show the need to decrease the noise level of existing machines and future machines in multimedia lecture rooms and the need to increase the sound absorption coefficient of surface in multimedia lecture rooms