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KSTAR 전류전송제어시스템의 원격운전을 위한 EPICS 기반 제어계 구축
김명규,백설희,김국희,박미경,Kim, Myung-Kyu,Baek, S.H.,Kim, K.H.,Park, M.K. 한국진공학회 2008 Applied Science and Convergence Technology Vol.17 No.1
KSTAR 전류전송제어시스템은 네트워크기반의 실시간 분산제어시스템으로 EPICS (Experimental Physics and Industrial Control System)를 미들웨어로 채용하여 구축하였다. 전류전송제어시스템은 초전도자석시스템에 전류를 전송하기 위한 시스템으로서 전류전송과 동시에 초전도자석이 초전도상태를 유지하기 위한 냉매의 전송도 담당하고 있다. 주제어실에서의 원격운전을 위하여 EPICS IOC(Input Output Controller) 서버를 현장에 설치하였고 이를 통하여 전류전송제어시스템은 고유의 이름(PV)에 적절한 조작 및 감시 명령을 부여하여 주제어실의 운전화면을 통하여 시스템의 감시 및 조작이 가능하도록 하였다. EPICS와 PLC의 통신을 위하여 ether-ip 드라이버를 이용하여 EPICS IOC를 구축하였으며, 시험 결과 안정성 및 운용성 측면에서 만족할 만한 결과를 획득하였다. The KSTAR Current Lead System(CLS) with network based real-time distributed control system is implemented using an EPICS as a middle-ware software. The current lead system transfers current from magnet power supplies to superconducting magnet system and simultaneously supply the coolant to maintain superconducting state. To control the CLS at main control room an EPICS IOC server is installed in local control area. Using this server, it is able to be controlled and monitored the system in main control room through operator interface(OPI) which uses "caget" to read status and "caput" to write command with a unique name called PV. The EPICS IOC is developed using "ether-ip" driver to communicate with PLC. Also we achieved satisfactory results in operation and stability aspects from a long period commissioning test.
유전체 박막을 이용한 다이아프램형 광섬유 Fabry - Perot 간섭계압력센서의 특성
김명규,유양욱,권대혁,이정희,김진섭,박재희,채용웅,손병기 ( M . G . Kim,Y . W . Yoo,D . H . Kwon,J . H . Lee,J . S . Kim,J . H . Park,Y . Y . Chai,B . K . Sohn ) 한국센서학회 1998 센서학회지 Vol.7 No.3
The strain characteristics of a fiber optic Fabry-Perot pressure sensor with high sensitivity using a Si₃N₄/SiO₂/Si₃N₄ (N/O/N) diaphragm is experimentally investigated. A 600 nm thick N/o/N diaphragm was fabricated by silicon anisotropic etching technology in 44 wt KOH solution. An interferometric fiber optic pressure sensor has been manufactured by using a fiber optic Fabry-Perot intereferometer and a N/O/N diaphragm. The 2 cm length fiber optic Fabry-Perot interferometers in the continuous length of single mode fiber were produced with two pieces of single mode fiber coated with TiO₂ dielectric film utilizing the fusion splicing technique. The one end of the fiber optic Fabry-Perot interferometer was bonded to a N/O/N diaphragm, and the other end was connected to an optical setup through a 3 dB coupler. For the N/O/N diaphragm sized 2 x 2 ㎟ and 8 x 8 ㎟, the pressure sensitivity was measured 0.11 rad/kPa and 1.57 rad/kPa, respectively, and both of the nonlinearities were less than 0.2%FS.
김진서,박창준,이기석,김명규,유원영,지형근,정일권,Kim, J.S.,Park, C.J.,Lee, K.S.,Kim, M.,Yoo, W.Y.,Jee, H.K.,Jeong, I.K. 한국전자통신연구원 2021 전자통신동향분석 Vol.36 No.1
Super-realistic content technology has recently attracted attention as a core of the "new normal" that can overcome the spatial constraints caused by pandemics. It is moreover the core that allows users in remote locations to meet and engage in various social, cultural, and economic activities based on a network. Content technology is rapidly spreading beyond the existing entertainment area to various industries as an innovative tool that can be used to overcome space-time constraints and improve the productivity of industrial sites, because reality and virtual reality are now super-connected with ultra-low latency. However, existing services such as teleconferencing and tele-collaboration do not provide a level of realism that replaces face-to-face services, and various technical requirements have been proposed to overcome this. The trends in core technologies such as XR twins, hyper-realistic reproduction, sensory interaction, and emotional recognition technology, which are necessary for interactive realistic content that leads to feelings, from reproduction to experience and emotion, are explained. In this article, our aim is to present the future of realistic content that enables human care and can even overcome psychological difficulties such as the "Corona blues".
손지연,원유재,박준석,김명규,한동원,황승구,Son, J.Y.,Won, Y.J.,Park, J.S.,Kim, M.G.,Han, D.M.,Hwang, S.K. 한국전자통신연구원 2000 전자통신동향분석 Vol.15 No.1
이동 네트워킹 환경에서 프록시의 적용은 메모리 요구량의 감소, 성능 향상, 비용과 활용도 측면에서의 효율성 등 많은 점에서 효용성이 입증되고 있다. 따라서 본 고에서는 프록시를 기반으로 하는 다양한 적응 기법들을 조사.분석하고, 아울러 프록시를 적용하는 데 있어서의 이슈가 되는 문제들을 살펴봄으로써 이동/무선 환경에서 프록시를 보다 효과적으로 활용할 수 있기를 기대한다.