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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.
양방향 최장일치법에 의한 한국어 형태소 분석기에서의 사전 검색 횟수 감소 방안
최재혁(J. H. Choi),이상조(S. J. Lee) 한국정보과학회 1993 정보과학회논문지 Vol.20 No.10
지금까지의 한국어 형태소 분석 방법론은 어절의 형태소를 분리하게 위해 상당히 많은 횟수의 사전 검색을 거친 후, 올바른 분석 결과를 얻는다. 본 논문에서는 이러한 사전 검색 횟수를 줄이는 새로운 방법론을 제안하고자 한다. 본 논문의 연구 결과는 다음과 같다. 첫째, overlap 정보를 이용한 양방향 최장일치법을 제안하고 이를 사용함으로써 디스크에 저장된 사전 검색 횟수를 감소시킨다. 둘째, 용언의 불규칙 처리를 위한 어미의 불규칙 정보를 조사어미사전에서 제공받음으로써, 사전 검색을 행하는 불규칙 처리 루틴의 호출 횟수를 감소시킨다. 셋째, 위의 처리를 위해 주기억 장치에 적재된 조사어미사전의 검색 횟수를 글자의 종성을 이용한 방법에 의해 감소시킨다. 넷째, 어절의 최장 어미나 조사에 대한 형태소 분리 정보를 조사어미사전에서 제공받음으로써, 조사나 어미의 생성에 대한 모호성 해결 및 처리를 위한 오버헤드를 감소시킨다. Until now, we have obtained the correct results through the analysis of Korean Morphology after several dictionary accesses to seperate morphemes of a word phrase. In this paper, we suggest a new methodology to reduce the frequency of dictionary accesses. The results obtained in this study are as follows: 1) We propose the bidirectional longest match strategy utilizing overlap information. By using this method, the access frequency of dictionary stored in disc can be reduced. 2) The frequency of routine calls for processing the irregular conjugation can be reduced by using the information of irregular verb endings stored in the postposition and verb ending dictionary. 3) The access frequency of postposition and verb ending dictionary stored in main memory can be reduced by using a final consonant to perform 1) and 2). 4) With the dictionary information about the morpheme seperation of the longest postpositon or verb ending in a word phrase, the ambiguity concerning the generation of postpositions or verb endings can be solved and the overhead of processing the generation of postpositions or verb endings can be reduced.
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.