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개선된 확장 유클리드 알고리듬을 이용한 유한체 나눗셈 연산기의 하드웨어 설계
이광호(K.H. Lee),강민섭(M.S. Kang) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.2
본 논문에서는 GF(2<SUP>m</SUP>) 상에서 나눗셈 연산을 위한 고속 알고리듬을 제안하고, 제안한 알고리듬을 기본으로 한 나눗셈 연산기의 하드웨어 설계 및 구현에 관하여 기술한다. 나눗셈을 위한 모듈러 연산은 개선된 이진 확장 유클리드 알고리듬 (Binary Extended Euclidian algorithm) 을 기본으로 하고 있다. 성능비교 결과로부터 제안한 방법은 기존 방법에 비해 지연시간이 약 26.7 % 정도 개선됨을 확인하였다.
조선소내 환기용 팬의 환기 성능 향상을 위한 시뮬레이션 기반의 날개 형상 개발
이광호(K. H. Lee),정세민(S. M. Jeong),박종천(J. C. Park),한명수(M. S. Han) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
In The main purpose of the present work is the Development of Blade Shape for High Performance of Ventilation Fan Used in Shipyard by using CFD analysis. The design parameters affecting the efficiency of ventilation fan were analyzed for the design of blade shape with High Performance. The angle and area of the blade including the vane were selected as the main design parameters. Considering the design parameters, the airflow rate through the outlet was numerically estimated by CFD analysis. From the results of analyses, it was concluded that the outflow rate increased as the vane area was wider and the vane angle was more tilted to negative direction. And the wider blade area was, the more flow rate was produced through the outlet. Of the analyzed cases, the most improved blade shape showed increases up to 39% than the existing shape.
김병희(B. H. KIM),최종필(J. P. CHOI),이광호(K. H. LEE),이혜진(H. J. LEE),이낙규(N. K. LEE) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
This paper presents the design of inchworm motor and guide system for high precision actuator system of large displacement and high force. The inchworm motor consist of a extending actuator that provides displacement of tool guide, and two clamping actuators which provide the holding force. PZT element has the low tensile strength and shear. Therefore, PZT stack is easy to break by the tensile and shear. In other to prevent PZT failure, the pre-load housing was designed by comparing the von-mises stresses according to the variation of the hinge stiffness. FEM was used to determine the hinge stiffness. Also the guide system is designed for the improvement of motion accuracy in the inchworm motor.