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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.
사출금형 냉각시스템 최적화를 위한 설계변수의 감소 방법 연구
최재혁(J. H. Choi),태준성(J. S. Tae),이병옥(B. O. Rhee) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
The cooling system optimization for injection molds was studied with a response surface method in the previous research. It took so much time to find an optimum solution for a large product due to ann extensive amount of calculation time for the CAE analysis. In order to use the optimization technique in the actual design process, the calculation time should be much reduced. In this study, we tried to reduce the number of design variables with the concept of the close relationship between the depth and the distance of cooling channels. The optimum ratio of the distance to the depth of cooling channels for a 2-dimensional problem was 2.0 so that the optimum ratio was again sought out for 4 industrial products. The major cooling effect of the injection molds for large products rely on baffle tubes. The optimum ratio of the distance to the depth for baffle tubes was 2.0 for the large products. The result enables us to reduce the number of the design variables by half in the cooling system optimization problem.