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최재혁(J.-H. Choi),최만수(M. S. Choi),김민석(M.-S. Kim),박연규(Y.-K. Park) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
We suggest flux quantum-based mechanism for force realization in the sub-pico-Newton range. By controlling the number of flux quantum in a superconducting ring, a force can be created as an integer multiple of a constant force step. For a 50 ㎚-thick Nb ring with the inner and outer radii of 5 μm and 10 ㎛, respectively, the force step is estimated to be 165 fN, assuming the magnetic field gradient of 10 T/m. We also estimated a maximum force limit to be 1 ~ 2 pN.
화염 중 CO₂ 레이저 조사를 이용한 탄소 나노입자 제조
이상훈(S.H. LEE),김영정(Y.J. KIM),황준영(J.Y. HWANG),최만수(M. CHOI) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
The influences of CW CO₂ laser on carbon soot particles produced in coflow diffusion flame have been investigated. To identify detailed morphological changes, high-resolution electron microscope (HRTEM) and selected area electron diffraction (SAED) are used. Element analyzer is also used to analyze the composition of particles. Effects of laser irradiation are quite different depending on the characteristics of target particles and the intensity of the laser beam. In post-nucleation region, it is observed that only the primary particle sizes are changed by laser- heating. But in nucleation region, ordered graphitic shell shaped carbon particles have been synthesized continuously via abrupt graphitization process by applying intense laser power density higher than 2 × 10⁴ W/㎠.