• Title, Summary, Keyword: GIL

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Transient Analysis and Evaluation of 345kV Combined Transmission Line Connected with GIL (345kV급 GIL이 연계된 혼합송전선로의 뇌서지해석 및 평가)

  • Jang, Hwa-Youn;Lee, Jong-Beom;Kim, Yong-Kap;Jung, Chae-Kyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.11
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    • pp.1949-1955
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    • 2010
  • This paper describes the characteristic and effectiveness of combined GIL transmission line through lightning surge analysis. In addition the XLPE cable is analyzed in the same condition to compare with GIL. Lighting surge analysis is carried out by EMTP/ATP-Draw to obtain overvoltage of GIL and XLPE cable at service-point and load-out area of underground line. Propagation velocity is calculated in combined transmission lines with GIL and XLPE cable. The overvoltage is also analyzed on GIL and XLPE cable with or without arrester operation. The Analysis results show that overvoltage of GIL is occurred higher than XLPE cable at the same condition. Therefore it is evaluated that the application of GIL at the field should be considered cautiously when more detailed transient analysis, another electrical testes and economic evaluations are implemented.

Characteristics of Korean Trauma Patients: A Single-center Analysis Using the Korea Trauma Database

  • Park, Youngeun;Chung, Min;Lee, Gil Jae;Lee, Min A;Park, Jae Jeong;Choi, Kang Kook;Hyun, Sung Youl;Jeon, Yang Bin;Ma, Dae Sung;Yoon, Yong-Cheol;Lee, Jungnam;Yoo, Byungchul
    • Journal of Trauma and Injury
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    • v.29 no.4
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    • pp.155-160
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    • 2016
  • Purpose: Two years have passed since a level I trauma center was officially opened in the Gacheon Gil Hospital, South Korea. We analyzed 2014 and 2015 registered patient data from the Korean Trauma Data Base (KTDB) to identify trends in trauma patient care and factors that influence the quality of trauma care at the Gacheon Gil trauma center. Methods: Data was extracted from the KTDB included patient age, sex, systolic blood pressure at emergency room arrival, revised trauma score, injury severity score, trauma injury severity score, transfusion amount, and the cause of death was analyzed. Results: A total of 3269 trauma patients were admitted to our trauma center in 2014 and 3225 in 2015. Demographics and mechanism of injury were not significantly different between years. The severity of trauma injury was decreased in 2015 although the mortality rate was slightly increased. This requires further analysis. Conclusion: The aim of this study was to determine the general status and trends in trauma incidence and management outcomes for the Incheon area. We noted no significant changes in trauma status from 2014 to 2015. We need to collect and review trauma patient data over a long period in order to elucidate trauma incidence and management trends in the trauma field. Finally, studies using trauma patient data will indicate appropriate quality control factors for trauma care and help to improve the quality of trauma management.

A Study on the GIL Modeling by ATP/Draw(EMTP) (ATP/Draw를 이용한 GIL 모델링 기법 연구)

  • Park, Hung-Sok;Jang, Tae-In;Kang, Ji-Won;Kim, Jin
    • Proceedings of the KIEE Conference
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    • pp.307-308
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    • 2008
  • 345kV 4복도체 이상의 가공선로를 GIL로 지중화 대치하기 위한 검토사항 중의 하나로서 GIL-가공선로 연계시의 과전압 접지방식 순환전류 등의 특성을 검토할 필요가 있다. 이를 위해서는 GIL을 포함하는 승전계통을 EMTP로 모델링하여 실계통에 나타날 수 있는 다양한 현상 및 특성을 분석할 필요가 있으나, 현재 전력계통 과도현상을 모의 할 수 있는 ATP/Draw(EMTP) 상에는 GIL을 모델링하기 위한 명시된 모델이나 방법이 존재하지 않아 현상 분석에 어려움이 있다. 따라서, 이 논문은 가공선로 중간의 일부구간에 GIL이 존재할 경우에 있어서 ATP/Draw(EMTP)를 이용한 GIL 및 가공송전선의 혼합선로 모델링에 대한 내용을 다루며, 구체적으로 GIL에 대한 모델링 시 GIS 또는 Cable 모델을 이용한 모의방법을 비교분석하여 적합한 방법을 제안한다.

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Overvoltage Analysis on GIL - Overhead Transmission Line by Lightning Surge Conditions (GIL-가공송전선로 연계시 뇌써지에 의한 과전압 검토)

  • Park, Hung-Sok;Jang, Tae-In;Kang, Ji-Won;Yoon, Hyung-Hee
    • Proceedings of the KIEE Conference
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    • pp.143-144
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    • 2008
  • 최근 국내에서 가스절연송전선(GIL: Gas Insulated Transmission Line)의 실계통 도입을 인하여 345kV급 GIL의 개발 및 적용을 위한 연구 및 검토가 수행되고 있다. 이 중의 하나가 가공송전선로 사이의 일부구간을 지중화 하여 GIL로 대치할 경우에 나타날 수 있는 써지에 의한 과전압의 검토이다. 가공선로의 일부구간을 GIL로 대치하는 데 있어서, 변전소 단이 원거리일 경우에는 변전소 내부의 차단기나 단로기 등 개폐 써지에 의한 과전압의 영향은 감쇄효과로 인하여 그다지 크지 않으며, 뇌써지에 의한 과전압이 주요 영향 요소로 작용하고 있다. 따라서, 본 논문은 뇌써지에 의한 GIL-가공선로 구간의 과전압을 검토하기 위하여 GIL과 인접한 가공선로 구간에 낙뢰가 유입된 경우를 가정하여 GIL에 발생되는 과전압 및 보호협조 방안을 분석한다.

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A Blunt Traumatic Vertebral Artery Injury: A Case Report

  • Lee, Min A;Choi, Kang Kook;Lee, Gil Jae;Yu, Byung Chul;Ma, Dae Sung;Jeon, Yang Bin;Chung, Min;Lee, Jung Nam
    • Journal of Trauma and Injury
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    • v.29 no.1
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    • pp.28-32
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    • 2016
  • Blunt traumatic vertebral artery injury (TVAI) is relatively rare, but it may frequently be associated with head and neck trauma. TVAI is difficult to diagnose with diverse outcomes, thus it is a clinical challenge. There are no widely accepted guidelines for treatment and diagnosis, so that the diagnosis of TVAI can be easily delayed. Therefore, any clinical suspicion from clues on the initial imaging is important for diagnosis of TVAI. The authors report on the case of a patient diagnosed as having a TVAI with a transverse foramen fracture.

Right Diaphragmatic Injury Accompanied by Herniation of the Liver: A Case Report

  • Lee, Min A;Choi, Kang Kook;Lee, Gil Jae;Yu, Byung Chul;Ma, Dae Sung;Jeon, Yang Bin;Lee, Jung Nam;Chung, Min
    • Journal of Trauma and Injury
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    • v.29 no.2
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    • pp.43-46
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    • 2016
  • Traumatic diaphragmatic injury (TDI) occurs in 1% of patients of blunt abdominal trauma. Most TDIs involve the left diaphragm, however the authors experienced TDI accompanied by a liver laceration of the right diaphragm. When detected early, TDI can be easily treated, however serious complications can occur if not. When diaphragmatic injury is suspected due to clinical manifestation, comprehensive analysis of the patient data including radiologic findings is important.

Intraoperative Frozen Cytology of Central Nervous System Neoplasms: An Ancillary Tool for Frozen Diagnosis

  • Kang, Myunghee;Chung, Dong Hae;Kim, Na Rae;Cho, Hyun Yee;Ha, Seung Yeon;Lee, Sangho;An, Jungsuk;Seok, Jae Yeon;Yie, Gie-Taek;Yoo, Chan Jong;Lee, Sang Gu;Kim, Eun Young;Kim, Woo Kyung;Son, Seong;Sym, Sun Jin;Shin, Dong Bok;Hwang, Hee Young;Kim, Eung Yeop;Lee, Kyu Chan
    • Journal of Pathology and Translational Medicine
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    • v.53 no.2
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    • pp.104-111
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    • 2019
  • Background: Pathologic diagnosis of central nervous system (CNS) neoplasms is made by comparing light microscopic, immunohistochemical, and molecular cytogenetic findings with clinicoradiologic observations. Intraoperative frozen cytology smears can improve the diagnostic accuracy for CNS neoplasms. Here, we evaluate the diagnostic value of cytology in frozen diagnoses of CNS neoplasms. Methods: Cases were selected from patients undergoing both frozen cytology and frozen sections. Diagnostic accuracy was evaluated. Results: Four hundred and fifty-four cases were included in this retrospective single-center review study covering a span of 10 years. Five discrepant cases (1.1%) were found after excluding 53 deferred cases (31 cases of tentative diagnosis, 22 cases of inadequate frozen sampling). A total of 346 cases of complete concordance and 50 cases of partial concordance were classified as not discordant cases in the present study. Diagnostic accuracy of intraoperative frozen diagnosis was 87.2%, and the accuracy was 98.8% after excluding deferred cases. Discrepancies between frozen and permanent diagnoses (n=5, 1.1%) were found in cases of nonrepresentative sampling (n=2) and misinterpretation (n=3). High concordance was observed more frequently in meningeal tumors (97/98, 99%), metastatic brain tumors (51/52, 98.1%), pituitary adenomas (86/89, 96.6%), schwannomas (45/47, 95.8%), high-grade astrocytic tumors (47/58, 81%), low grade astrocytic tumors (10/13, 76.9%), non-neoplastic lesions (23/36, 63.9%), in decreasing frequency. Conclusions: Using intraoperative cytology and frozen sections of CNS tumors is a highly accurate diagnostic ancillary method, providing subtyping of CNS neoplasms, especially in frequently encountered entities.