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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. .
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.
김유겸,김진국,이지호 한국스포츠산업경영학회 2023 한국스포츠산업경영학회지 Vol.28 No.4
This study aims to analyze research trends in the field of sport management based on studies published in the three most influential journals, namely Sport Management Review(SMR), Journal of Sport Management(JSM), and European Sport Management Quarterly(ESMQ), which are indexed in the Social Science Citation Index (SSCI). In contrast to previous trend analyses, this study takes a different approach by examining the disciplinary background, research methods, and phenomena within the field of sport management. A total of 1,667 papers published from 1987 to 2023 were analyzed, and the findings are as follows: The disciplinary background of sport management research shows a predominant influence of management studies, with sociology consistently accounting for approximately 30% of the research. Psychology, although rare in the past, has shown a continuous increase over time, while economics and public administration each represent less than 10% of the research. In terms of research methods, experiential studies account for over 90% of the total, and quantitative research is more prevalent than qualitative research. The study of sport phenomena focuses more on spectator sports than participation sports, with a particularly high proportion of research on professional sport phenomena. The field of management phenomena can be categorized into management, marketing, industry, and leisure and tourism phenomena. In the management category, human resources and organizational behavior research are the most active, while sponsorships and consumer behavior research dominate the field of marketing research.