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가상생산 및 실험을 통한 폴리에틸렌관과 금속관 일체형 볼 밸브의 개발에 관한 연구
서영성(Yeong Sung Suh),유제혁(Je Hyuk Yoo),지민욱(Min Wuk Ji),송정현(Jeong Hyun Song),이재윤(Jae Yoon Lee) 한국가스학회 2010 한국가스학회지 Vol.14 No.1
가스 파이프의 배관 작업 중 작업 공정 수 및 단가를 낮추는 방법으로 PE관과 강관 일체형 볼 밸브를 개발하였다. 이를 위하여 먼저 유한요소해석을 근간으로 한 가상생산 지원 설계를 수행하여 누설에 대한 안전성을 갖는 프로토타입 제품 설계안을 제시하고, 이를 검증하기 위하여 누설 시험을 병행하는 통합적인 방법을 취하였다. 다양한 설계모델을 대상으로 내압에 대한 접촉해석을 수행하여 제안된 최종설계안으로부터, 여름(ΔT= 60 ℃)과 겨울(ΔT= -50 ℃)의 과장된 온도의 변화조건에도 비교적 광범위한 부분에서 최대 접촉압력이 각각 71 MPa, 및 8.1 MPa을 유지할 것을 예측하였다. 최종설계안을 바탕으로 시제품을 만들어, 열간 내압크리프 시험을 수행하였으며 사용압력(0.25 MPa)보다 훨씬 높은 가압조건(54 MPa)에서도 기밀을 유지하는 것을 확인하였다. In order to reduce the number of installation processes and the cost, a unified ball valve and polyethylene-steel pipe is proposed and tested. An integrated design approach is carried out such that a virtual manufacturing based on finite-element analysis is first performed in order to examine contact conditions under exaggerated temperature variations (ΔT= 60 ℃ and -50 ℃ for summer and winter, respectively). From the final design configuration, it was predicted that the maximum contact pressures are 71 and 8.1 MPa for summer and winter, respectively, at relatively larger contact surface. Based on this observation, a prototype model is fabricated to go through an actual leakage test. The prototype pipe passed a hydrostatic strength test successfully, showing no leakage at even much higher (54 MPa) than the operational pressure (0.25 MPa).
객체지향형 처방 데이터베이스의 구축과 처방 검색 프로그램의 설계 및 개발
김현호(Kim Hyunho),홍효신(Hong Hyo Shin),유제혁(Yoo Je Hyuk),권오민(Ohmin Kwon),차웅석(Cha Wung Seok) 한국한의학연구원 2011 한국한의학연구원논문집 Vol.17 No.2
The first medical text in which detailed treatments of diseases by combinations of materia medica are mentioned is the 『Shanghanzabinglun(傷寒雜病論)』. True meaning of the combinations of materia medica used in this text lies in the fact that the efficacy of a prescription transcends that of the linear sum of each materia medica. This kind of concept regarding the composition of a prescription has come to contribute to the formation of theories in prescriptionology; However, it is difficult to analyze and interpret the meaning of each prescription separately because of differences in interpreting methods, points of view, and terminologies used by members of different academical branches. Therefore, it is desirable that one should understand a prescription as having been modified from a basic prescription, and then bring the interactions of ingredients into the picture, finally understanding the efficacy and chief virtues of the targeted prescription. Nevertheless, with the massive information of prescriptions, which exist in the format of texts, it is impossible to efficiently take advantage of prescription analyzing methods, and therefore the range of analysis extremely restricted. In order to overcomes these weaknesses, this paper suggests that object-oriented prescription database be constructed and that a search program for education and research that could facilitate an efficient access to the database be developed as well.