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김재구(Jaegu Kim) 강원대학교 기초과학연구소 1986 기초과학연구 Vol.3 No.-
선형화된 최소 초중력이론의 구조를 기약 초장을 이용하여 분석했다. superspin 3 / 2의 기약 초장은 선형화된 Weyl 초중력을 기술함을 보였다. 이 Weyl 초중력을 보조장과 결합하여 선형화된 Poincare 초중력을 구했다. The structure of the minimal supergravity is analyzed at linear level by using irreducible superfields. It is shown that the irreducible superfield with superspin 3 / 2 describes the linearized Weyl supergravity. The linearized Poincar'e supergravity is obtained by coupling the Weyl supergravity with compensating superfield.
레이저에 의해 패터닝 된 바늘과 탄성중합체와의 마찰 효과
김재구(Jaegu Kim),노승국(Seungkook Ro),박종권(Jongkweon Park),조성학(Sunghak Cho),황경현(Kyunghyun Whang) 한국레이저가공학회 2012 한국레이저가공학회지 Vol.15 No.3
The friction force of patterned needle in elastomer have been investigated to verify the application for bio and plastic industry. The micro pattern on the needle surface were prepared by 266 nm, 20 ns laser and 800 nm, 220 fs laser, which were able to generate the different surface roughness. The friction force was measured by the load cell of 10 N capacity. As the results, the friction force of no patterned needle is almost constant during the needle penetrates the silicone rubber sample. However, the needle having asperities shows the variation of the friction force. The higher the surface roughness is, the smaller the friction force is until the surface roughness is very high. In our experiment conditions, the reduction of the friction force by 20 % compared to no pattern needle was achieved with straight and 50 μm discrete line generated by 266 nm, 20 ns laser.
김재구(JaeGu Kim),구동식(DongSik Gu),최병근(ByeongKeun Choi) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.4
The acoustic emission (AE) technique is a well-known non-destructive test technique, both in research and for industrial applications. It is mainly used to monitor the onset of cracking processes in materials and components. Predicting and preventing the crack phenomenon has attracted the attention of many researchers and has continued to provide a large incentive for the use of condition monitoring techniques to detect the earliest stages of cracks. In this research, goal is in grasping features of AE signal caused by crack growth. The envelope analysis with discrete wavelet transform (DWT) is used to find the characteristic of AE signal. To estimate feature of divided into three by crack length, the time waveform and the power spectrum were generated by the raw signals and the transferred signal processed by envelope analysis with DWT.