• 제목/요약/키워드: Choi Chang Hak

검색결과 275건 처리시간 0.042초

30kW 고정식 태양광발전시스템의 발전 특성 조사 (Power Survey of 30kW Solar System without tracking mechanism)

  • 문채주;임정민;장영학;소순열;최병천
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2008년도 제39회 하계학술대회
    • /
    • pp.1126-1127
    • /
    • 2008
  • A photovoltaic panel is a device that, through the photovoltaic effect, converts luminous energy into electric energy. Photovoltaic generation system used infinity of solar energy, cost of fuel is needless and there in no air pollution or waste occurrence. This paper summarizes the results of these efforts by offering a photovoltaic system structure in 30[kW] large scale applications installed in Mokpo National University dormitory roof. The status of photovoltaic system components, are inter-connection and safety equipment monitoring system will be summarized as this article. This describes configuration of utility interactive photovoltaic system which generated power supply for dormitory. In this paper represent 30[kW] utility photovoltaic system examination result.

  • PDF

기업 하이퍼미디어 문서 관리를 위한 메타정보시스템 개발 (Developing a Meta-information System for Corporate Hyperdocuments)

  • 서우종;이희석
    • 한국경영과학회지
    • /
    • 제17권1호
    • /
    • pp.65-65
    • /
    • 1992
  • Recently many organizations have attempted to build hypermedia systems to expand their working areas to internet-based virtual work places. It is thus important to manage corporate hypermedia documents effectively. Metadata play a critical role for managing these documents. This paper identifies metadata roles and components to build its schema. Furthermore a meta-information system HyDoMiS(Hyperdocument Meta-information System) is proposed by the use of this metadata schema. HyDoMiS performs three functions metadata management search and reporting The metadata management function is concerned with workflow document and database. The system is more likely to help implement and maintsain hypermedia information system effectively.

학생 생활지도에 CRM을 적용할 때 필요한 종합정보관리시스템의 기능 (Necessary Functions of the Integrated Information Management System applying CRM to Student Guidance)

  • 이경재;김창용;류해수;최영복;김영권;배재학
    • 한국정보처리학회:학술대회논문집
    • /
    • 한국정보처리학회 2001년도 춘계학술발표논문집 (하)
    • /
    • pp.1101-1104
    • /
    • 2001
  • 본 논문에서는 제7차 교육과정이 지향하는 바, 학교의 중요업무 중의 하나인 학생 생활지도를 더욱 효과적으로 실행하기 위한 새로운 방안을 찾아보고자 하였다. 이를 위해, 기업에서 고객관리 방법으로 시행하고 있는 CRM의 견지에서 학생 생활지도를 재조명하여 보았다. 그 결과 학생 생활지도에 CRM의 방법론을 적용할 때 필요한 종합정보관리시스템의 기능을 확인하였다.

  • PDF

UPFC 설치에 따른 거리계전기 영향분석 (Analysis of Effects on Existing Distance Relays due to UPFC Installation)

  • 최종윤;한영성;이학성;장병훈;윤종수
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2002년도 추계학술대회 논문집 전력기술부문
    • /
    • pp.303-306
    • /
    • 2002
  • FACTS 기기의 하나인 PFC는 송전선로에 직렬로 전압을 주입하는 기기로서 송전선로의 유효전력과 무효전력을 독립적으로 제어할 수 있다. 하지만 송전선로에 설치되어 있는 거리계전기의 입장에서 보면 UPFC가 전압을 직렬로 주입함에 따라 선로의 임피던스가 변하는 것처럼 보일 수 있다. 그러므로 본 논문에서는 전남 강진변전소에 설치될 UPFC의 EMTDC 모델을 이용하여 정상상태에서의 UPFC의 운전조건에 따른 임피던스 변화량을 살펴보고, UPFC 주변계통에서 사고가 발생한 경우 UPFC의 보호회로 동작과 계전기에서 바라보는 임피던스의 변화량을 확인하여 거리계전기의 오동작 가능성과 셋팅치 정정여부를 살펴보았다.

  • PDF

Novel Technology for Achieving Contrast Ratio over 800:1 In Super IPS Mode TFT-LCD

  • Lim, Ji-Chul;Choi, Youn-Seung;Park, Youg-Hak;Lee, Tae-Rim;Oh, Chang-Ho
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.I
    • /
    • pp.27-28
    • /
    • 2005
  • We developed Super IPS mode TFT-LCD TV which have contrast ratio over 800:1. To increase contrast ratio, polarizer film, TFT design and color filter photoresist are investigated. In this report, we describe the basic concept and effectiveness of each item. The application of a newly developed color filter photoresist was the most effective for achieving this high contrast ratio.

  • PDF

주행 로봇을 위한 비젼 기반의 특징지도 작성 및 위치 결정 알고리즘에 관한 연구 (Vision-Based Feature Map-Building and Localization Algorithms for Mobile Robots)

  • 김영근;최창민;진성훈;김학일
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2002년도 하계학술대회 논문집 D
    • /
    • pp.2475-2478
    • /
    • 2002
  • This paper consider's the problem of exploring an unfamiliar environment in search of recognizable objects of visual landmarks. In order to extract and recognize them automatically, a feature map is constructed which records the set of features continually during a learning phase. The map contains photometric geometric, and metric information of each feature. Meanwhile, the localization algorithm can determine the position of the robot by extracting features and matching in the map. These procedures are implemented and tested using an AMR, and preliminary results are presented in this paper.

  • PDF

PROTECTION SEQUENCE OF AC/DC CONVERTERS FOR ITER PF MAGNET COILS

  • Oh, Byung-Hoon;Hwang, Churl-Kew;Lee, Kwang-Wang;Jin, Jeong-Tae;Chang, Dae-Sik;Oh, Jong-Seok;Choi, Jung-Wan;Suh, Jae-Hak;Tao, Jun;Song, In-Ho
    • Nuclear Engineering and Technology
    • /
    • 제42권3호
    • /
    • pp.305-312
    • /
    • 2010
  • The protection sequence of an AC/DC converter for an ITER PF coil system is developed in this study. Possible faults in the coil system are simulated and the results reflected in the design of a sequence to protect the coil and converter. The inductances of the current sharing reactors and thyristor numbers in parallel with the bridge arms are optimized with the designed protection sequence.