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복합곡면 가공시 공구간섭의 탐지와 공구경로 수정에 관한 연구
서태일,조명우,조재형 한국공작기계학회 1999 한국생산제조학회지 Vol.8 No.6
In this paper we deal with interference problem in the case of compound surface machining. A new tool interference detection and correction method based on the envelope of the tool path is suggested to identify and correct the tool interference - not only within the local path of tool movement, but also outside of the tool path. Therefore, the developed strategy can be used to check the possible interference in any region of the surface. In order to analyze quantitatively the milled surface errors produced by the tool interference, improved surface prediction model is also suggested in cutting process by general cutters. The effectiveness of th proposed method is demonstrated through simulation study.
조선족 이주여성의 자조모임을 통해서 본 초등학생 자녀교육경험에 관한 연구
서태실(Seo, TaeSil),이윤정(Lee, YunJung) 학습자중심교과교육학회 2017 학습자중심교과교육연구 Vol.17 No.24
본 연구는 자조모임에 참여하는 초등학생을 둔 조선족 이주여성 8명을 대상으로 자조모임을 통해서 본 자녀교육 경험을 알아보는데 연구의 목적이 있으며, 2016년 10월부터 2017년 4월까지 6개월 동안 심층면담을 하였으며, 연구의 결과는 다음과 같다. 첫째, 초등학생 자녀교육경험은 한국의 낯선 교육환경에 대한 불안감, 사교육걱정, 자녀들의 정체성 문제로 고민하였으나, 이주여성들은 학부모모임이나 학교 행사 참여, 체류자격의 변경, 직장생활의 유지, 적극적인 사회활동을 통해 극복하고자 하였다. 둘째, 자조모임에서 운영하는 자녀교육프로그램은 자녀들이 다양한 문화를 이해하고, 부모와 자녀간의 문화적 공감대와 관계를 형성하는데도 도움이 되었다. 셋째, 자조모임 참여 이후 이주여성들은 한국의 교육방식과 부모역할에 대해 알아가게 되었고, 자녀교육문제를 공동으로 해결해 나갈 방안을 구상하였으며, 좋은 부모가 되기 위해 올바른 자녀교육관을 정립하여야 함을 알았다. 넷째, 자조모임이 자녀교육에 주는 의미는 부모와 자녀 모두 정서적 쉼터의 역할을 하였으며, 회원들간 녀교육을 위한 소통의 장이 되었다. 즉, 자조모임을 통해 이주여성들은 정보교류와 심리 및 정서적 안정을 가지게 되었고, 자조모임은 이주여성이 안정적으로 한국 사회에 정착하는 데 중요한 역할을 하였다. 위 연구를 바탕으로 제언을 하면, 타민족 이주여성의 자조모임에 대한 연구와 이주여성 자조모임의 운영상황이나 방식, 개선방안 등에 대한 연구가 진행되기를 기대한다. The purpose of this study was to investigate experiences of eight Korean-Chinese migrant women with children going to elementary school through their self-help group for their children s education. For this purpose, in-depth interviews and participation observation were conducted from October 2016 to April 2017, leading to the following conclusion: First, the women found it necessary to attend school conferences, to change visa status, to maintain occupation, and to continue taking part in social activities so that they can avoid deep concern over unfamiliar education environment, expensive private lessons or children s identity crisis. Second, children s education program run by the self-help group activities have been successfully carried out so as to enable them to understand a variety of cultures and to build sympathy and positive relationship between parents and children. Third, the self-help group has brought the parents a new perspective on children s education, Korean way of education, role of parents, new idea to collaborate for better education of their children, and need to establish a right educational philosophy for them to become good parents. Children also became familiar with their mom s culture, confirming their identity and strengthening their ties with peer group, and self-confident with more positive attitude toward learning. Fourth, self-help group provided not only spiritual healing, support and encouragement among members, but also made a platform for communication among members for their children s education. That is, the group offered information exchange opportunity, psychological or emotional security enough to have the women settle down peacefully in Korean society. Future research, bases upon the current research outcome, may be expanded to other nationalities than Korea-Chinese or in-depth research on operation system and scheme to improve existing system of the group meeting.
서태일,조명우 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.4
The main goal of our research is to compensate the milled surface errors induced by the tool deflection effects, which occur during the milling process. First, we predict cutting forces and tool deflection amount. Based on predicted deflection effects, we model milled surface shapes. We present a compensation methodology, which can generate a new tool trajecto-ry, which is determined so as to compensate the milled surface errors. By considering manufacturing tolerance, tool path compensation is generalized. To validate the approaches proposed in this paper, we treat an illustrative example of profile milling process by using flat end mill. Simulation and experimental results are shown.
서태일(T.I. Seo),박동삼(D.S. Park),홍연찬(Y.C. Hong),조명우(M.W. Cho),배종석(J.S. Bae),신장순(J.S. Shin),김유진(E.G. Kim) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
This paper presents an integrated machining error compensation method based on PNN(Polynomial Neural Network) approach and inspection database of OMM(On-Machine-Measurement) system. To efficiently analyze the machining errors, two machining error parameters are defined and modeled using the PNN approach, which is used to determine machining errors for the considered cutting conditions. Experiments are carried out to validate the approaches proposed in this paper. In result, the proposed methods can be effectively implemented in a real machining situation, producing much fewer errors.