Method for Protection of Single‑Line‑Ground Fault of Distribution System with DG Using Distance Relay and Directional Relay

Jung‑Hun Lee,Min‑Su Park,Hong‑Seon Ahn,Kyung‑Won Park,Jun‑Seok Oh,Seung‑Gyu Jeon,Dong‑Kyu Kim,Jae‑Eon Kim 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.4

When large scales DG are connected to the distribution system of unidirectional power currents, bi-directional power currents are formed, making it impossible to use conventional overcurrent protection methods alone to detect and isolate fault sections for ground and short-circuit faults. To solve these problems, this study proposed the method of protection against single-line-ground fault of common neutral line multi-contact local power distribution system using distance relay and directional relay. The proposed protection method was applied to the common neutral multi-ground distribution system to validate the protection against single-line-ground fault through the PSCAD/EMTDC software package and efectively detect and isolate only the zone of single-line-ground fault without malfunctions.

대구시 소방권역별 접근성 분석을 이용한 구조대 재편방안

정규동(Jung Gyu-Dong),홍원화(Hong Won-Hwa),최준호(Choi Jun-Ho),김광섭(Kim Gwang-Seob),이지수(Lee Ji-Soo) 대한건축학회 2012 대한건축학회논문집 Vol.28 No.9

In a fire situation, the priority is fast and safe rescue. Therefore, because of the importance of the role of rescue team, specify the criteria of equipments as act. But it can’t be helped appear vulnerable area according to the problems such as province fiscal conditions and budget. in this study suggest improvement considering the characteristics of the actual road and emergency vehicles through accessibility analysis. In the process of vulnerable area deduction, the area of service area is wider, the larger number of vulnerable buildings. And analyze that especially approximately 77% of the entire are vulnerable buildings. Jung-gu, Daegu, the center of the approach is only 3% of vulnerable buildings, but as a whole of Daegu, Within 5 minutes from the rescue team are difficult to access the building by about 30 percent. In order to improve it, Station of jurisdiction that need to be adjusted or additional installations proposed regional strategy for the reorganization. According to the proposed strategy to evaluate the improvement, vulnerable about the whole building from 140,000 to 70,000 could be reduced by half. Alternative to reduce the vulnerability of buildings according to the percentage reduction in overall approximately 30-16% can be reduced. If use the result of study, it will be able to set priorities of expansion of rescue team, and utilized to predict macroscopic vulnerable area in Daegu city.

Correction: Direct characterization of graphene doping state by <i>in situ</i> photoemission spectroscopy with Ar gas cluster ion beam sputtering

Yun, Dong-Jin,Kim, Seyun,Jung, Changhoon,Lee, Chang-Seok,Sohn, Hiesang,Won, Jung Yeon,Kim, Yong Su,Chung, JaeGwan,Heo, Sung,Kim, Seong Heon,Seol, Minsu,Shin, Weon Ho The Royal Society of Chemistry 2018 Physical chemistry chemical physics Vol.20 No.4

<P>Correction for ‘Direct characterization of graphene doping state by <I>in situ</I> photoemission spectroscopy with Ar gas cluster ion beam sputtering’ by Dong-Jin Yun <I>et al.</I>, <I>Phys. Chem. Chem. Phys.</I>, 2018, 20, 615-622.</P>

끝나지 않는 기억전쟁(mnemonic battle)

박동숙(Dong-Sook Park),이재원(Jae-Won Lie),정사강(Sa-Gahng Jung),강혜원(Hye-Won Kang),김해원(Hae-Won Kim) 한국여성커뮤니케이션학회 2014 미디어, 젠더 & 문화 Vol.29 No.4

제주 4?3 사건은 약 7년 동안 남북한 정권, 민간인, 미국 등 서구 열강의 힘 등이 복합적으로 작용해 숱한 사람들이 사망한 사건이다. 4?3 사건을 둘러싼 논의와 갈등들은 한국 근현대사의 문제들과 닿아 있으며 4?3 사건과 그 진상규명과정에서 파생한 갈등들, 한국사회에서 4?3 사건이 기억되는 맥락은 매우 복합적인 결을 지니고 있다. 본 연구는 4?3 사건을 두고 일어나는 기억의 의미투쟁 현장을 신문은 어떻게, 얼마나 보도하고 있는가를 고찰하고자 했으며 이를 위해 1999년부터 2013년까지 14년 동안 경향신문 동아일보 조선일보 한겨레신문(가나다순) 기사 중 4?3 위주로 보도된 654건의 연도별 보도량과 주제, 기사의 의미와 기사 속 행위자 등을 분석하여 미디어 기억이 어떤 이야기를 하고 있는지 살펴봤다. 4?3을 둘러싼 최근 14년간의 뉴스미디어의 기억 지형을 살펴본 바, 사회적으로 드러난 4?3사건을 둘러싼 중요한 이슈 지점들과 4?3사건을 기억하는 미디어의 기억 지형에서 나타나는 중요한 순간들은 일치하지 않았으며 언론은 지엽적이고 파편적이며 정치 ‘싸움’에 집중된 갈등적인 요소들을 두드러지게 부각시키고 있었다. 무엇보다 4?3사건이 지니고 있는 본질적인 갈등양상과 뉴스미디어에서 그려내고 있는 갈등의 내용과 모습은 큰 차이를 보이고 있으며 뉴스미디어를 통해 이뤄지고 있는 기억전쟁은 왜곡된 형태를 지니고 있는 것으로 드러났다. The Jeju April 3(4?3) Incident occurred during seven years, from 1947 to 1954 in the island of Jeju. Two separated Korean governments, Korean civilians, United States of America and the other actors were complexly related to the incident and 25,000 casualties were estimated. The ongoing discussion and conflict regarding the 4?3 incident is still controversial and the context in which the incident is remembered in Korean society is complicated. Considering the complex nature of the Jeju April 3 Incident, this Study examined the mnemonic battle in Korean newsmedia, how Korean newsmedia covered this incident last fourteen years. For this study, four Korean daily newspapers- Kyunhyang, Dong-A, Chosun and Hanguerae were selected and 654 articles directly related to the incident were collected and analysed. Consequently the main issues and important moments of the 4?3 incident exposed in society and in newsmedia were in discord and inconsistent. The newsmedia covering the incident focused on peripheral issues, fragmented memories and minor conflicts instead of the essence of the incident, and therefore distorted the nature of it.

Analysis of lawsuit cases in the Department of Surgery in Korea

Ji Yun Jung,김소윤,Dong Gyu Kim,Choong Bai Kim,Kyong-Choun Chi,강원경,Won Lee 대한외과학회 2018 Annals of Surgical Treatment and Research(ASRT) Vol.94 No.3

Purpose: The aim of this study is to prepare medical staff in order to prevent medical malpractice litigation through analysis of litigation cases related to the department of surgery in Korea. Methods: A total of 94 litigation cases related to the department of surgery, where a certain amount of payment was ordered to the defendant between 2005 through 2010, were analyzed. We examined time of occurrence, amount claimed and awarded in damages, plaintiff claims, and court opinion. Results: An average of 3.2 years was spent from the date of the incident occurring to the end of the litigation procedures. The average amount awarded in judgments for damages was 59,708,983 ± 67,307,264 (range, 1,700,000–365,201,482) Korean won. Cases were found involving the following opinion of the court: violation of duty of care (49 cases), violation of informed consent (7 cases), violation of duty of care and informed consent (5 cases), and settlement, reconciliation, and others (32 cases). By analyzing defendants’ negligence in court opinions, diagnosis (30.8%) was the most common, followed by post-operation management (27.7%). Conclusion: Physicians have to conduct treatment and surgery based on exact diagnosis and be careful to observe patients’ conditions and symptoms after surgery. It is essential to identify the current status and characteristics of medical litigation for reducing further litigation and improving patient safety. In order to create a safe medical environment, national efforts should be made not only by individuals but also at the national level.

Ⅴ. 속담(俗談)ㆍ수수께끼편

임동권(Im Dong-Kwon),박현국(Park Hyun-Kook),김정원(Kim Jung-Won),장정순(Jang Jong-Soon) 중앙대학교 한국문화유산연구소 1995 중앙민속학 Vol.- No.7

하수처리장 적용을 위한Semi-카플란 수차가 장착된 마이크로수력발전 시스템

채규정(Kyu Jung Chae),김동수(Dong Soo Kim),천경호(Kyung Ho Cheon),김원경(Won Kyoung Kim),김정연(Jung Yeon Kim),이철형(Chul Hyung Lee),박완순(Wan Soon Park) 大韓環境工學會 2013 대한환경공학회지 Vol.35 No.5

소수력발전은 하수처리장 에너지 자립을 위한 효과적인 대안이다. 본 연구는 유량변동이 크고 유효낙차가 낮은 중소형하수처리장(기흥레스피아) 적용을 위해 피치조절형 세미카플란(semi-kaplan) 마이크로수력발전의 적용 타당성을 평가하였다. 가변피치 semi-kaplan 수차는 유량조절을 위한 가이드베인은 생략하고 피치조절형 런너를 장착하여 기계적 결함은 줄이면서 유량변동이 큰 처리장에 특화된 기술이다. 마이크로수력발전 시스템은 설계조건(유량 0.35 m3/s, 유효낙차 4.7 m)에서 90.2%의 수차효율 달성이 가능하였고 발전용량은 13.4 kW로 산정되었다. 설비가동률 74%로 가동 시 연간 약 86.8 MWh 에너지 생산을 통해 2.1%의 에너지 자립이 가능하고 이는 연간 49톤의 CO₂ 감축효과와 맞먹는다. 경제성 평가결과 초기 건설공사비가 200,000,000원 이하인 경우에는 내부수익률은 6.1%, 순현가는 15,539,000원, 편익-비용률은 1.08, 투자회수년은 15.5년으로 경제성이 충분한 것으로 나타났다. Small scale hydropower is one of most attractive and cost-effective energy technologies for installation within sewage treatment plants. This study was conducted to evaluate the potential of a semi-kaplan micro-hydropower (MHP) system for application to sewage treatment plants with high flow fluctuations and a low head. The semi-kaplan MHP is equipped with an adjustable runner blade, and is without a guide vane, so as to reduce the incidence of mechanical problems. A MHP rating 13.4 kWp with a semi-kaplan turbine has been considered for Kiheung Respia sewage treatment plant, and this installation is estimated to generate 86.8 MWh of electricity annually, which is enough to supply electricity to over 25 households, and equivalent to an annual reduction of 49 ton CO₂. The semi-kaplan turbine showed a 90.2% energy conversion efficiency at the design flow rate of 0.35 m3/s and net head of 4.7 m, and was adaptable to a wide range of flow fluctuations. Through the MHP operation, approximately 2.1% of total electricity demand of Kiheung Respia sewage treatment plant will be achievable. Based on financial analysis, an exploiting MHP is considered economically acceptable with an internal rate of return of 6.1%, net present value of 15,539,000 Korean Won, benefit- cost ratio of 1.08, and payback year of 15.5, respectively, if initial investment cost is 200,000,000 Korean Won.

Productivity Loss of Rheumatoid Arthritis Patients according to the Their Stages of the Disease Activity Score

( Sang-Cheol Bae ),( Jin-Hye Cha ),( Jung-Yoon Choe ),( Sung Jae Choi ),( Soo-Kyung Cho ),( Won-Tae Chung ),( Chung-Il Joung ),( Young-Ok Jung ),( Young Mo Kang ),( Dong-Wook Kim ),( Jinseok Kim ),( Y 대한류마티스학회 2018 대한류마티스학회지 Vol.25 No.2

Objective. Productivity loss was compared by 3-stage of disease activity and associations between higher disease activity and high productivity loss were identified. Methods. Data were extracted from Rheumatoid Arthritis (RA) Patient-reported Outcomes Research, which enrolled 2,000 RA patients (>20-year) on disease-modifying-antirheumatic-drugs (DMARDs) (≥ 6-month) from December 2012 to June 2013. This included 1,457 RA patients with the disease activity score (DAS-28-ESR) in their medical charts. Productivity loss in time and indirect cost was estimated using The World Health Organization Health and Work Performance Questionnaire (HPQ). Baseline characteristics and productivity loss outcomes were compared according to DAS-28-ESR groups. Results. 84.4% were females, 54.2% had low DAS-28-ESR (<3.2), and 38.2% and 7.6% had moderate (3.2∼5.1) and high DAS-28-ESR (>5.1). Patients with moderate to high DAS-28-ESR had higher lost productivity time (LPT) and monthly costs of LPT than those with low DAS-28-ESR (time in hours: 110.0±58.4 vs. 132.4±57.2 vs. 71.5±52.0, p<0.0001; monthly costs of LPT in 1,000 Korean won: 1,097±607 vs. 1,302±554 vs. 741±531, p<0.0001). Multiple regression analyses revealed significant associations with high LPT in high (adjusted odds ratio [OR]=3.87, 95% confidence interval [CI]: 2.18∼6.87) and moderate DAS-28-ESR (adjusted OR=1.88, 95% CI: 1.41∼2.52) compared to low DAS-28-ESR. In addition, positive associations with high monthly costs of LPT were observed in high (adjusted OR=3.45, 95% CI: 1.98∼5.99) and moderate DAS-28-ESR (adjusted OR=1.93, 95% CI: 1.43∼2.54) compared to low DAS-28-ESR. Conclusion. Timely therapeutic strategies should be taken into consideration given that the RA patients with moderate to high DAS-28-ESR showed strong associations with high productivity loss for effective management of RA. (J Rheum Dis 2018;25:122-130)

Optimization of LC-MS/MS method for the determination of theanine

Dong Su Shin,Ka Yun OH,Won Jo Choe,Sung Boo Kang,Eun Young Kwon,Hee Jung Lee,Hun Jung Gwak,Ju Young Lee,Ji Hun Kim,Jung Su Park,Won Min Pak,Cheol Woo Park,Dong Gil Leem,Dong Sul Kim,Chang Hee Lee 한국분석과학회 2018 학술대회논문집 Vol.2018 No.5

Lipidomic analysis of plasma lipids composition changes in septic mice

Won-Gyun Ahn,Jun-Sub Jung,Dong-Keun Song 대한생리학회-대한약리학회 2018 The Korean Journal of Physiology & Pharmacology Vol.22 No.4

A lipidomic study on extensive plasma lipids in bacterial peritonitis (cecalligation and puncture, CLP)-induced sepsis in mice was done at 24 h post-CLP. The effects of administration of lysophosphatidylcholine (LPC) and lysophosphatidic acid(LPA), compounds known to have beneficial effects in CLP, on the sepsis-induced plasma lipid changes were also examined. Among the 147 plasma lipid species from 13 lipid subgroups (fatty acid [FA], LPA, LPC, lysophosphatidylethanolamine [LPE],phosphatidic acid [PA], phosphatidylcholine [PC], phosphatidylethanolamine [PE],phosphatidylinositol [PI], monoacylglyceride [MG], diacylglyceride [DG], triacylglyceride[TG], sphingomyelin [SM], and ceramide [Cer]) analyzed in this study, 40 and 70 species were increased, and decreased, respectively, in the CLP mice. Treatments with LPC and LPA affected 14 species from 7 subgroups, and 25 species from 9 subgroups, respectively. These results could contribute to finding the much needed reliable biomarkers of sepsis.