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최영석,Choi, Young-Suk 대한전자공학회 1999 電子工學會論文誌-T Vol.t36 No.2
The design method that the structure of double actuators of read-only or read-writable DVD optical pick-up of high density can be compact into the structure of one actuator, is proposed. The designed actuator has the structure of the shaft sliding type in which the moving part can be rotated about the shaft accord to a used optical disc and an objective lens can be switched, and is suspended with magnetic spring. In this actuator, Coulomb's friction is used as damping force and the moving part is designed by finite element method so that the second natural vibration mode can not occur within the servo band. The mock-up of the actuator designed in this paper is made, and its dynamic characteristics is measured and estimated. CD(Compact Disc) 호환성을 가지는 고밀도 재생전용 및 기록재생용 DVD(Digital Video Disc) 기기의 광학픽업 2중 엑츄에이터 구조를 콤팩트하게 할 수 있는 단일 엑츄에이터 설계법을 제시한다. 설계된 엑츄에이터는 가동부에 CD용 대물렌즈와 DVD용 대물렌즈를 함께 장착하고, 사용 디스크에 따라 가동부를 축주위로 회전시켜서 대물렌즈를 전환하는 축습동형 구조를 하고, 자기 스프링에 의하여 부동된다. 감쇠방식으로서는 가동부와 축사이의 쿨롱마찰을 이용하고, 가동부는 유한요소법(FEM)을 통해, 서보대역내에서 2차 진동모드가 발생하지 않도록 한다. 본 논문의 설계법을 검증하기 위하여 시제품을 제작하고, 동특성을 측정, 평가한다.
최영석,Choi, Young-Suk 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.2
In this paper, the instrument for scientific education in elementary school is developed with the application of basic robot technology for coming IT future world. Particularly, a kind of robot game to fun a race with each other is planed to give a motive or interest in scientific education. This robot game is played with two robots per player, One robot is moved wirelessly with a remote controller and the other robot is moved automatically with intelligence given by computer program made by a player. This game system will be in spotlight as multi-objective educational system not only to teach basic technology of IT, but also to improve the ability for logical and creative thought in elementary school students.
미얀마와 주요 인접 3개국과의 무역확대 가능성에 대한 연구 -인도, 태국, 중국과의 무역구조에 대한 분석을 중심으로-
최영석 ( Young Suk Choi ) 한국외국어대학교 동남아연구소 2014 東南亞硏究 Vol.24 No.1
The paper analyzes the possibilities of trade enlargement between Myanmar and its three major neighbor countries, namely India, Thailand, and China. Some findings are as follows: In the case where Myanmar becomes the export country, based on the estimates of trade complementary index, Myanmar``s export industry structure is not well matched in compliance with the import industry structure of the three trading partner countries. According to the estimates of the country bias index, however, the figures for the three trading parner countries are sufficiently high, which indicates that Myanmar and Thailand and India are attempting to increase trade volume with each other. In the case where each of the Myanmar``s neighbor countries in concern becomes the export country, the estimation results are almost similar to the above case except for India. Overall, India is the country to show the highest possibility to increase the trade volume as long as only the comparative advantage matters, while Thailand and China are not the case. However if we add other strategic factors in our investigation it is hard to tell which country will show the highest possibility to increase the trade with Myanmar because the estimates of the country bias index of each country shows noticeably high in many cases.