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PBT 결정 형태에 미치는 열처리 효과와 아민분해 거동
김유겸,김갑진 한국섬유공학회 1989 한국섬유공학회지 Vol.26 No.1
In order to investigate the effect of annealing on the crystalline stucture of poly(butylene terephthalate)(PBT) and the selective degradation of PBT by amines, PBT filaments(FDY) were annealed under various condition, thereafter crystallinity, birefringence, and tensile properties were measured, also the aminolysis behavior of annealed PBT was observed. The plateau region in load-extension curve indicates not only crystal transition of $\alpha$longrightarrow$\beta$, but also orientation behavior of crystalline phase. Additionally, the "maximum extension" region, which might stand for the crystalline morphology, was newly defined. There was a linear relationship between "maximum extension" and crystallinity. The selective degradation action of amine to PBT was also observed and proved by the measurements of density and intrinsic viscosity as in the case of the aminolysis of PET. And "solvent-induced crystallization" was also brought about during the selective degradation of PBT filaments by 40% methylamine solution.s by 40% methylamine solution.
김유겸,김현식 제어·로봇·시스템학회 2022 제어·로봇·시스템학회 논문지 Vol.28 No.5
In recent years, the need for surface life-saving is gradually increasing as a response to accidents such as ship collisions in the marine environment. To solve this problem, there were approaches that launched life-saving rings or approached humans closely using rescue robots. However, they had limitations in terms of stability, safety and rapidity. To resolve this problem, a catamaran-type rescue robot with a life-saving ring launcher is proposed and its mechanism is developed. Straightness, turning, and launching tests were performed to verify the validity of the proposed rescue robot mechanism. Experimental results show that the proposed rescue robot mechanism enables stable and rapid surface life-saving. Therefore, it shows that the mechanism has meaningful components in surface life-saving and has the possibility of real system application. .
김유겸 서울대학교 규장각한국학연구원 2020 한국문화 Vol.0 No.89
The purpose of the present study lies in examining the vowel harmony of Gangwondo in terms of ongoing change. Through this, we tried to identify the connection of the subregions in Gangwon-do and the direction of the change process. In other words, the study is an attempt to discuss ongoing language changes through a synchronic approach. Based on the assumption that language change progresses gradually through a word like the hypothesis of lexical diffusion, the data showed that although it is in the same environment, the choice of –a/ə ending was different depending on word within one region, and the ratio also varied depending on the region. The study took these results as a sign that language change is progressing gradually based on word, while at the same time it can predict the direction and speed of change through the ratio of choices. In chapter 4, I identifies the situation of vowel harmony in Gangwondo. The data used in this chapter are words contained in the 『한국방언자료집』. The choices of vowel harmony are divided according to the environment such as ending vowel of word stem or words with an irregular conjugation. As a result, a change in the combination of -ə ending took place first in southern Gangwondo, except for Samcheok and Jeongseon. After that time, the combined -ə ending has gradually grown to the north due to the diffusion of the innovation forms. I was able to confirm from a recent survey of Hwacheon that the power of the combined -ə ending is more extensive than ever before. Therefore, it has been confirmed that it is reasonable to set the direction of change from south to north. This study was described by a single phenomenon, the vowel harmony. However, vowel harmony is a phenomenon that is currently ongoing changes in Gangwondo. So vowel harmony is an important phonetic phenomenon that can identify where the key areas driving change are. I suggested the possibility that Pyeongchang would be the one in charge of key area in Gangwondo. I could also confirm once again that the dialect dicision of Gangwondo could be divided into the South and the North. .
글로벌 제조 환경을 위한 생산현황 원격 모니터링 시스템
김유겸,강재관 경남대학교 정보통신연구소 1999 연구논문집 Vol.1 No.-
본 논문에서는 글로벌 매뉴팩처링 환경을 갖는 가상의 기업을 대상으로 수주와 생산 및 FMS 현장을 통합하여 관리할 수 있는 웹 기반 생산 정보 시스템을 구축하였다. 먼저 FMS 시스템을 제어하는 PLC와 데이터베이스를 연동시켜 생산현황이 실시간으로 데이터베이스에 저장되게 하였고 FMS 생산 현황은 웹과 연결하여 원격에서도 모니터링할 수 있게 하였다. 수주정보 및 생산정보는 분산 DB를 이용하여 인터넷으로 연동될 수 있도록 하였다. 본 연구에서 개발된 방법은 각각 두 대의 서버와 클라이언트 그리고 교육용 FMS 시스템을 이용하여 구현하였다. In this paper, a prototype web-based remote production monitoring systems for virtual manufacturing is presented. Three subsystems such as : 1) remote real time monitoring of FMS, 2) interface between PLC and database, 3) web-based production management system, are developed. A MMI s/w is engaged for real time monitoring of FMS, and TCP/IP protocol is used for the communication between a server and a client. Interface between PLC and database is performed by the function of MMI which allow to use VB script. The prototype system is implemented on two sever computers and an educational FMS.