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TN-C-S계통에서 PEN도체 단선이 인체안전에 미치는 영향
김정철(Jung-Cheol Kim),이규선(Kyu-Sun Lee),이복희(Bok-Hee Lee) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.5
In electric power supply systems, an earthing system determines the electric potential of the conductors related to that of the Earth’s surface. The choice of earthing system has implications for the safety of the power supply systems. There are considerably different regulations for earthing (grounding) systems in each country. A protective earth(PE) conductor ensures that all exposed conductive surfaces are at the same electric potential as the earth surface. This paper deals with that when PEN conductor of TN-C-S system is disconnected, dangerous touch voltage causes personnel body to be harmed and human being’s property to be damaged seriously. For this reason, this paper explains how serious problems can occur when the fault current flows. As a consequence, we can understand how we can design earthing system properly to ensure the personnel safety against earth faults. The result shows the way that TN-C-S system can be applied safely in Korea.
마스터데이터관리 이해도가 국방 마스터데이터관리시스템 수용에 미치는 사용자 집단별 차이 분석
김정철(Jung-Cheol Kim),이춘열(Choon Yeul Lee),이인석(Lee In Seog),강희주(Hee Joo Kang) 한국데이타베이스학회 2013 Journal of information technology applications & m Vol.20 No.1
It has been found that users" characteristics are important variables that explain information systems adoption. These user groups, which are called COIs (Community Of Interests), might show different behaviors to each other to the same information system. We study differences in MDM (master data management) system adoption between military users and SI developers using TAM (Technology Acceptance Model). In case of military users, the perceived usefulness of an MDM system does not have impacts on intention to use an MDM system. Only the ease of use of an MDM system has impacts on intention to use an MDM system. However, in case of SI developers, both the perceived usefulness and the ease of use of an MDM system have impacts on intention to use an MDM system, which are similar to findings in previous studies. These results might be interpreted that users do not pay much attention to the usefulness in adopting a new information system in a centralized organization. They are obligated to use an information system whether it is useful or not. Thus the ease of use has more impacts on users than the usefulness.
Landsat TM/ETM+ 위성영상을 활용한 칠레 Southern Volcanic Zone의 화산과 적설변화와의 상관성 연구
김정철 ( Jeong-cheol Kim ),정형섭 ( Hyung-sup Jung ) 대한원격탐사학회 2017 大韓遠隔探査學會誌 Vol.33 No.3
칠레에 위치한 남부화산지역(SVZ, Southern Volcanic Zone)에는 화산활동이 매우 활발한 Mt. Villarrica와 Mt. Llaima 화산 있으며, 두 화산은Stratovolcano 형태이고 정상부에 만년설이 존재한다는 공통점이 있다. 본 연구에서는 시계열적으로 활용 가능한 위성영상자료를 활용하여 25년간 두 화산의 만년설의 변화와 화산활동과의 상관관계를 분석하고자 한다. 연구를 위해, 1986년 9월부터 2011년 2월까지 총 60장의 Landsat-5 TM 및 Landsat-7 ETM+자료를 사용하였으며, 위성영상 기반의 NDSI(Normalized Difference Snow Index) 알고리즘과 SRTM DEM을 활용하여 각 영상의 적설 면적 및 설선고도를 추출하였다. 최종적으로 화산활동에 직·간접적으로 영향을 받는 적설변화양상의 정량적 지표가 되는 적설면적, lower-snowline, upper-snowline을 위성영상으로부터 추출하여 각각의 비교 분석을 통해 화산활동 유추 가능성을 확인하였다. 분석 결과, Villarrica화산은 Llaima 화산에서 적설면적이 20 이하일 때, lowersnowline이 1,880m을 이상일 때 55%이상의 확률로 화산 활동이 있었음을 확인 가능하였다. 또한 두 화산의 upper-snowline이 -170m 이하 일 때, 90% 이상의 확률로 화산이 분화하였음을 확인 할 수 있다. 따라서 화산의 적설 변화는 화산활동과 밀접한 상관성이 있으며, 적설을 모니터링하는 것으로 화산활동을 간접적으로 유추하는 것이 가능하다는 것을 밝혀내었다. The Southern Volcanic Zone (SVZ) of Chile consists of many volcanoes, including the Mt.Villarrica and Mt.Llaima, and the two volcanoes are covered with snow at the top of Mountain. The purpose of this study is to analyze the relationship between the ice caps and the volcanic activity of the two volcanoes for 25 years by using the satellite image data are available in a time series. A total of 60 Landsat-5 TM and Landsat-7 ETM + data were used for the study from September 1986 to February 2011. Using NDSI (Normalized Difference Snow Index) algorithm and SRTM DEM, snow cover and snowline were extracted. Finally, the snow cover area, lower-snowline, and upper-snowline, which are quantitative indicators of snow cover change, were directly or indirectly affected by volcanic activity, were extracted from the satellite images. The results show that the volcanic activity of Villarrica volcano is more than 55% when the snow cover is less than 20 and the lower-snowline is 1,880 m in Llaima volcano. In addition, when the upper-snowline of the two volcanoes is below -170m, it can be confirmed that the volcano is differentiated with a probability of about 90%. Therefore, the changes in volcanic snowfall are closely correlated with volcanic activity, and it is possible to indirectly deduce volcanic activity by monitoring the snow
구정회(Jung-Hoei Ku),조형래(Hyung-Lae Cho),박만준(Man-Jun Park),김정철(Jeong-Cheol Kim) 대한견주관절의학회 2011 대한견주관절의학회지 Vol.14 No.2
목적: 골내 침범이 동반된 비전형적인 견관절 석회화 건염 1예를 보고하고자 한다. 대상 및 방법: 만성적인 좌측 견관절 동통의 급성 악화와 운동 제한을 주소로 내원한 59세 여자 환자로 단순 방사선 상 견봉하 석회 침착과 자기 공명 영상 상 감염이나 종양과 유사하게 골 피질을 침범하고 석회 물질이 골 내부로 연장되어 있었다. 관절경하 석회 제거술과 골내 석회의 소파술, 건 결손부에 봉합 나사못을 이용한 회전근 개 봉합술을 시행하였다. 결과: 환자의 급성 견관절 통증은 술 후 즉각적인 호전을 보였고 순조로운 재활 경과와 관절 운동범위의 회복을 보였다. 술 후 5개월에 촬영한 단순 방사선 상 석회 침착의 재발은 관찰되지 않았다. 결론: 견관절 석회화 건염은 주위 골조직으로 연장된 다양한 영상 소견을 나타 낼 수 있으며, 질환을 정확히 판별함으로써 불필요한 검사나 치료를 피할 수 있을 것으로 생각된다. Purpose: We present an atypical case of calcific tendinitis of the shoulder with intraosseous loculation. Materials and Methods: A 59 year-old female complained of acute exacerbation of chronic left shoulder pain and restricted range of motion. Simple radiographs showed a subacromial calcific deposit and magnetic resonance imaging revealed cortical erosion with intraosseous extension of calcific material mimicking infection or tumor. She was managed with arthroscopic excision of the calcific deposit, curettage of the intraosseous lesion and subsequent rotator cuff repair with a suture anchor. Results: Her acute pain promptly subsided. Her rehabilitation was uneventful and she gained full range of motion. Radiographs five months after the operation showed no recurrence of calcific material. Conclusion: Calcific tendinitis of the shoulder can present with a variety of images involving the adjacent bone. The correct recognition of this disorder may avoid unnecessary investigation and treatment.