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.

3-Trolley Portainer Crane 운전 시뮬레이터의 개발

정민포,김규년,정태동,최제헌,김종훈 울산대학교 1994 공학연구논문집 Vol.25 No.2

항만에서, 빠른 시간내에 많은 양의 컨테이너 박스를 운반하는것이 곧 비용 절감이다. 이를 위해서는 크레인의 성능을 미리 예측을 할 수 있어야 한다. 특히 새로운 크레인을 제작할때, 실제 시험을 해본후 그 성능을 알아내기란 어려운 실정이다. 따라서, 컴퓨터상에서 이를 미리 시뮬레이션하여 그 성능을 알아낸다면 여러면에서 비용절감의 효과를 얻을수 있다. 본 연구에서는 기존의 하나의 Trolley에 의해 운전되는 크레인보다 더 나은 성능을 위해 설계된 3-Trolly Portainer Crane을 시뮬레이션하는 소프트웨어를 개발했다. 이것은 3개의 Torolley가 동시에 작동하여 하나일때보다 더 빠른 시간에 작업을 완수할수가 있다. 이 사실을 시뮬레이션을 통해 증명하고, 다양한 결과 자료를 이용해서 실제 이 크레인의 제작에도 상당히 도움이 될수 있다. 또한, 3개가 동시에 움직여서 각 구간별 소요시간의 측정이 문제가 되지만, 이것을 하나의 task로 미리 계산할 수 있는 방법을 고안, 적용하여 완수 하였다. In the port, it is a reduction of cost to load or unload many containers quickly. To do so, we should predict the performance of crane. Therefore, if we could simulate a crane operation and estimate the performance by the computer system, we can obtain a benefit of cost. In this study, we developed an operation simulator system of the 3-Trolley Portainer Crane which is designed for more efficeincy. Conceptually, the 3-Trolley Portainer Crane is operated concurrently by 3 trolleys, so it is faster than 1-Trolley Portainer Crane. We proved that through the simulation. It will be useful to manufactrue 3-Trolley Portainer Crane with many results from this software system. Also, the problem that must be calculated in parallel is solved by a single calculation method which we developed.

정신분열병 환자의 인지과제수행에서 삼차원적 시공간-운동 방해자극 처리의 특성

정혜정,김재진,박성혁,전종희,김지혜,염태호,이장한,김선일,구정훈,조원근,안석균,이홍식 大韓神經精神醫學會 2003 신경정신의학 Vol.42 No.2

Objectives : Abnormalities of cognitive responses to verbal and visual distracter in schizophrenia have been demonstrated in numerous studies but little is known about three dimensional visuospatial-motor distracter processing. The purpose of this study was to investigate the vulnerability of patients with schizophrenia to three dimensional visuospatial-motor distracter. Methods : 14 patients with schizophrenia and 14 normal volunteers were assessed on three dimensional maze tasks requiring on working memory and reasoning ability in the virtual reality environment. Performances were compared according to with- or without-distracter conditions. Results : Patients with schizophrenia showed significantly lower performances than normal control group on cognitive flexibility, simple motor function or motor control and motor coordination, working memory span and delayed performance times. The performance index tended to be more deteriorated, but not significantly, in with-distracter condition than in Without-distracter condition in schizophrenia. Conclusions : Patients with schizophrenia tend to be vulnerable to visuospatial-motor distracter which simulate the real world of three dimensional environment.

수입각증후군에 의한 급성 복증 1례

정은욱,지삼룡,이영태,박지훈,김동기,제인수,채두근,박성재,박은택,이연재,이상혁,설상영,정정명 白中央醫療院 2005 仁濟醫學 Vol.26 No.1

Afferent loop syndrome is an uncommon complication of a gastrectomy and Billroth Ⅱ reconstruction. It may cause symtoms at any time from the first postoperative day to many years after the gastrectomy. Afferent loop syndrome is characterized by abdominal pain, vomiting and elevation of serum amylase. Thus, it is difficult to differentiate afferent loop syndrome from other cause of acute pancreatitis. However, the history of gastrectomy can be an important clue for diagnosing afferent loop syndrome. We experienced one case of chronic afferent loop syndrome with acute pancreatitis. After appropriate management, the abdominal pain disappeared and serum amylase level decreased. We report this case with a review of relevant literatures.

고효율 폐페인트의 재활용 기술 개발

정재헌,김정수,김종민,김영한,이상록,장상목 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1

In this study, the equipment and method to recyle waste-paint, were developed and investigated. The efficiency of drying and pulverizing the waste-paint were improved via vescosity reducing process and microwave energy source with a blast of hot air. This method may be useful to recyle the waste-paint, rubber and plastics.

여가레크리에이션 프로그램 참여자의 몰입수준과 생활만족도 분석

정훈,남재화 龍仁大學校 體育科學硏究所 2005 體育科學硏究論叢 Vol.15 No.1

The purpose of this study is to clarify the commitment level and Life satisfaction of leisure-recreation program participants. To accomplish the purpose of this study, the adults over twenty years old were established as population and the 242 subjects who participate in leisure-recreation program operated in Korea were selected by the stratified cluster random sampling method. The survey questionnaires were used to collect data. To verify about Commitment Level, we applied the survey questionnaires developed by Scanlan(1993) and standardized by Jung Yong-gak(1996). To verify about satisfaction, we applied the survey questionnaires developed by Dinner, Emmonson, Larsen and Griffin(1985) and translated by Lee Jong-gil(1992). Within a certain period of the inquiry formality leisure-recreation program participants made out survey questionnaires as self-administration method. The statistical methods utilized in this study for analyzing the collected data were reliability analysis, descriptive statistics, standard multiple regression analysis. From the analysis of this study, the following conclusions were obtained: Firstly, leisure-recreation program participants's participation level partially influence on commitment level. Secondly, leisure-recreation program participants's participation period partially influence on life satisfaction. Thirdly, leisure-recreation program participants's commitment level is correlated to life satisfaction.

우라늄 이온의 선택흡착

정종헌,김준수,오원진,유재형,유승곤 한국공업화학회 2002 응용화학 Vol.6 No.1

Uranium-containing aqueous wastes have been treated by electrosorption on a carbon electrode composed of activated carbon fibers(ACFs) in a continuous flow-through cell. Effective uranium (VI) removal is accomplished when a negative potential in the range of -0.3 to -0.9V (vs. Ag/AgCI) is applied to the carbon electrode. For a feed concentration of 350mg/l, the concentration of U(VI) in the cell effluent is reduced to less than lmg/l. Electrosorption capacity over 552 mg_uranium/g_ACF is reached.

Vector 合成法을 이용한 Booming Noise 低減에 關한 硏究

김재열,유신,오성민,장종훈,김갑중 조선대학교 생산기술연구소 1997 生産技術硏究 Vol.19 No.1

Booming Noise of a Automotive can be divided in Air Borne Noise and Structure Borne Noise. In this study, Booming Noise is reduced by the vector Synthesis method. The vibration that transferred by the engine is managed. The car that by the used model is composed of Mount system supported to three point with 2000 cc 14 engine FR vehicle. The vibration that is transmitted from propeller sharft and Differential Gear to Sub Frame and Suspention effect Booming Noise. but, The vibration that generated by the Mount has Booming Noise more than it. So, We research that sound generated by the Mount and reduce that Booming Noise used the Dynamic Damper. The Booming. Noise by the vector Synthesis. is reduced in 2000 ~ 4000 rpm front of vehicle. We know that Booming Noise is reduced into hoped for rpm by the vector Synthesis.

안내염과 대장암이 동반된 재발성 간농양

전승정,김태헌,류민선,오다연,송명은,이신아,류재인,김혜인,문일환,유권 이화여자대학교 의과학연구소 2011 EMJ (Ewha medical journal) Vol.34 No.2

The causes of pyogenic liver abscess has been known as biliary tract disease or intrabadominal infection but the large proportions of the patients has no apparent underlying disorders. Recently colonic mucosal lesions were reported in patients with cryptogenic liver abscess and it has been suggested that colonic mucosal break may play a role in developing liver abscess in otherwise healthy patients. We experienced a patient of severe recurrent liver abscess complicated with endophthalmitis only 3 months after successful treatment of initial cryptogenic liver abscess and a polypoid colon cancer was discovered by chance. It seems prudent to proceed colonoscopic examination in patients with cryptogenic liver abscess especially when it is recurrent.

서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)

김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1

In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.