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.

서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1994)

김재홍,안진균,정성재,김영태,김중환,김시영,이석종,이홍렬,서호석,김경훈,권혁진,정우권,고우석,이용석,안필수,오준규,오용섭 대한화학요법학회 1996 대한화학요법학회지 Vol.14 No.1

Background : In recent years gonorrhoea has been panendemic and remains one of the most common Sexually Transmitted Diseases in the world, especially in developing countries. Objective & Method : For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria Gonorrhoeae(PPNG), Ive have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results : In 1994, 168 strains of N. gonorrhoeae were isolated, among which 109 (64,9% ) were PPNG. Conclustion : Our results suggests that the prevalence of PPNG in Seoul is still increasing.

항균성 펩타이드인 Mastoparan B의 살조효과

서정길,김찬희,배윤정,문호성,김근용,박희연,윤호동,김창훈,변대석,홍용기,박남규 한국어병학회 2003 한국어병학회지 Vol.16 No.3

Mastoparan B (MPB)는 벌독으로부터 정제된 양친매성α-helical 구조를 취하면서 14개의 아미노산 잔기로 구성된 염기성 항균성 펩타이드로서 여러 가지 생물막과 작용한다. 본 연구에서는 우리 나라 연안의 적조 (HABs, harmful algal blooms)를 일으키는 4종의 적조생물 (Alexandrium tamarense, Chattonella catenatum)에 대한 MPB의 살조효과를 조사하였다. MPB의 4종의 적조생물에 대한 살조효과는 31.3㎍/㎖에서 세포의 lysis또는 ecdysis와 같은 형태로 현미경으로 관찰할 수 있었다. 또한 MPB는 C. marina 및 C. polykridorides에 대해서 A. tamarense와 G. catenatum보다 더욱 강한 살조효과를 나타내었다. 이러한 MPB의 HABs에 대한 살조효과연구는 새로운 살조물질을 개발하기 위한 자료가 될 것으로 생각된다. Mastoparan B (MPB), an antimicrobial cationic peptide isolated from the venom of the hornet Vespa basalis, is a basic amphipathic a-helical peptide composed of fourteen amino acid residues. In this study, we have investigated the algicidal effect of MPB against hatmful algae blooms (HABs) casative Alexandrium tamarense, Chattonella marina, Cochlodinium polykrikoides and Gymnodinium catenatum. The algicidal effect of MPB showed in the concentration of 31.3 ㎍/㎖ to 500 ㎍/㎖ against 4 HAB species and observed cell lysis or cell ecdysis by microscopy. MPB reacted more sensitive to C. marina and C.polykrikoides than A. tamarense and G. catenatum. The algicidal study of MPB against HABs will provides much insight into development of new algicidal substances.

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.

도시열섬현상 완화를 위한 녹지네트워크 및 바람길 구축

차재규 ( Jae Gyu Cha ),정응호 ( Eung Ho Jung ),류지원 ( Ji Won Ryu ),김대욱 ( Dae Wuk Kim ) 한국지리정보학회 2007 한국지리정보학회지 Vol.10 No.1

현대의 도시는 살아있는 생명체처럼 매일 변화를 거듭하고 있다. 이전과 달리 집중된 공간에서 짧은 시간동안 일어난 공간의 변화는 도시환경을 악화시켜 환경문제를 유발하였다. 특히 지표면 및 토지이용의 변화 등으로 발생된 도시열섬현상은 도시민의 건강과 경제적인 손실 등 사회문제로 대두되고 있다. 이러한 도시열섬현상을 해결하기 위한 도시계획적 접근방법의 하나가 녹지네트워크의 도입이다. 본 연구에서는 대구광역시 중구와 남구를 사례대상지로 선정하여 도시열섬현상 분석, 토지피복분류, 녹지네트워크 연계가능성 분석, 바람길 분석을 통하여 녹지네트워크 구축을 제안하였다. 연구결과 남쪽의 앞산 및 산지지역을 녹지네트워크의 핵, 두류공원 및 달성공원 등 남구 2개 지역과 중구의 6개 지역의 근린공원을 거점으로 하고 학교부지와 공원시설 등을 포함하는 지역을 거점 가능지역으로 설정하여 대상지역의 광역 및 세부 그린네트워크 구축을 제안하였다. 특히 앞산과 연결되는 캠프워커는 핵과 연결되고 있는 거점지역으로서 향후 미군부대 이전 후에 반드시 보전되어야 할 지역으로서 판단된다. 또한 녹지네트워크를 통해 바람길을 확보하기 위하여 중구의 수성교 인근과 남구의 캠프워커지역을 바람통로확보지구를 설정하는 것이 바람직할 것으로 판단된다. Like other organic beings, modern cities change every day. Unlike in the past, changes of space which have been taking place in concentrated spaces during short periods of time have worsened the environment of cities creating environmental problems. In particular, the urban heat-island phenomenon, which is caused by changes in using the earth`s surface, has emerged as a key social issue along with health problems and economic difficulties. The Green Network has been introduced as an urban planning approach to solve the urban heat-island phenomenon. This study suggests constructing a Green Network through analyzing the urban heat island phenomenon, land cover classification, and linkage possibility with the Green Network and wind corridors by researching Jung-Gu, and Nam-Gu in Daegu Metropolitan City. In conclusion, this study presented the construction of a broad and detailed Green Network of object areas by assigning Apsan to the southern area and mountain area as the core, two areas of Nam-Gu and six areas of Jung-Gu such as Duryu Park and, Dalsung Park as footholds and other school land and park facility areas as footholds-to-be areas. In particular, Camp Walker, which is connected with Apsan, is not only a foothold but connected to the core, is necessary to preserve after being transferred from the U.S. Army. In addition, assigning the Susung Bridge area of Jung-Gu and the Camp Walker area of Nam-Gu as the wind corridor areas is recommended.

공학교육에서 프로그램 학습성과 평가를 위한 교과기반 평가모델 개발

김 중 규 대구대학교 정보통신연구소 2014 情報通信硏究 Vol.10 No.1

본 논문은 공학교육에 있어 프로그램 학습성과 평가를 위한 방법으로 기존의 직접 평가도구를 이용하는 방법 대신, 교과기반 평가를 위해 대표 교과목을 기반으로 하는 평가 모델에 대해 서술하였다. 이를 위해 프로그램 학습성과의 개념, 공인원이 KEC2015에서 제시한 10가지 프로그램 학습성과, 그리고 프로그램 학습성과 평가체계에 대해 살펴보고, 교과기반 평가 도입을 위해 교과기반 평가의 개념, 효과, 적용방법, 모형과 모형의 각 단계별 고려사항 그리고 교과기반 평가의 전체 모델에 대해 살펴보았다. 그리고 이를 바탕으로 대표 교과목을 기반으로 한 특정 프로그램 학습성과 평가를 위한 방안 및 모델을 제시하고, 대표 교과목을 이용한 프로그램 학습성과 평가의 적용 가능성 그리고 확장성 등에 대해 논의하였다. This paper presents an assessment model based on special course using course-embedded assessment for program outcome, instead of the existing direct tools, in engineering education. First, the program outcomes related with the KEC2015 are introduced, and the assessment methods and systems are described. Some prerequisites were given to set up course-embedded assessment successfully in engineering education. The model of course-embedded assessment was given with consideration for each step, that is, set up of program outcomes, check of related courses, selection of assessment tools, set up of performance criteria, implementation of course-embedded assessment, and analysis method of results. Finally, the validity and expandability of the assessment of the program outcomes using the course-embedded assessment.

WMI 기술을 이용한 컴퓨터 원격제어 시스템

김정규;김형준;전용화;최병문;서재현;김태공 인제대학교 2012 仁濟論叢 Vol.27 No.1

In organization and company managing a lot of computers, it is difficult to manage the computer system, because it is not easy to recognize exceptions of distributed workplace such as departments and laboratories. Existing computer management systems control many computers through manager using server computer for management in field. Therefore they have the characteristic of strong locality. In this paper, we develop computer remote control system which supports convenient features and non-locality to managers by broadening effective ranges of computer management. We use Web-Site and Android Platform to develop the environment of client management regardless of multiple clients and locality. Moreover, we use WMI (Windows Management Instrumentation) to recognize and control the status of client PC without a impact on computer users.

경안천의 애반딧불이 서식지 오염부하량 및 생태특성

김수복,고정문,홍순상,주덕현,홍윤기,김진성,김영규 용인대학교 자연과학연구소 2011 自然科學硏究所論文誌 Vol.16 No.1

The aim of this study was to research water quality, eco-nature and firefly habitant Keung An Stream from June to July. To conserve ecosystem of firefly habitant, We must manage to have a diverse aspect of ecology and water quality. This study was to research water quality, eco-nature and firefly habitant Keung We find 11 firefly habitat in Keung An Stream. To conserve ecosystem of firefly habitant, We must manage to have a diverse aspect of ecology and water quality.

합성 Goethite에 의한 인산이온, 황산이온 및 구리이온의 흡착 특성

김정두,유수용,문명준,감상규,주창식,이민규 한국환경과학회 2003 한국환경과학회지 Vol.12 No.9

Adsorption of phosphate, sulfate, and copper ion to goethite was investigated. Goethite was prepared in the alkaline solution. In the single adsorbate systems, the final equilibrium plateau reached within 20 min. The adsorption isotherms of the individual ions could be well described by the Langmuir equation. The maximum adsorption capacities (q_(max)) were calculated as 0.483 mmol/g and 0.239 mmol/g at pH 3 for phosphate and sulfate ion, and 0.117 mmol/g at pH 6 for copper ion, respectively. In competitive adsorption system with phosphate and sulfate, phosphate ion was a stronger competitor for adsorption on goethite than sulfate ion, which was consistent with higher affinity of phosphate ion for the surface compared to sulfate ion. The existence of sulfate ion enhanced the adsorption of copper ion but the adsorption of sulfate was inhibited when copper ion was present.

ATM 교환망에서 ADSL 기반 가입자 선로의 성능분석

김중규,김용진,강각흠 大邱大學校 科學技術硏究所 1998 科學技術硏究 Vol.5 No.4

In this paper, ADSL function of ATM switching system has been examined and ADSL service test has been performed in real enviroment. The customer service loop range and its performance evaluation of 10^(-7) cell losses specification has also been tested in order to provide general customers with ADSL service using pair line that can be operated via already established voice telephone subscriber line on ATM. In addition, it can be thought that, with careful consideration, there is no trouble to apply ADSL technique nationally. The test results show that very high speed information telecommunication network of over 2Mbps can be worked with fair line condition of 3.7km, representative line noise condition of 3.4km, and 3.35km in the worst case(each cases the diameter of line is 0.4mm). Therefore ADSL technique with ATM can be applied to national subscriber line, and further more this technique will be appropriate service medium that can reduce the enormous investment and the construction term of national very high speed information telecommunication network.