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발전량 비교를 통한 창조식 조력발전의 기동낙차 결정에 관한 연구
김현한(Hyun-Han Kim),김광호(Kwang-Ho Kim) 대한전기학회 2018 전기학회논문지 Vol.67 No.5
Because of its predictability of the energy cycle and huge scale power output, the ocean energy from tidal power utilization has always received attention as a great energy source, even though its development cost, including the embankment construction, is so much higher than that of any other energy source. Nevertheless, nowadays many projects are being planned on account of institutional support from the government and the recent advance of construction technology. In Korea, the new industry field operating and managing the tidal power plant has already opened. But we are facing a number of problems for optimal operation of tidal power plant that are a lack of operation experience and a skill of professional management and others. This paper suggests a novel way to determine the starting head of power generation by generating power comparison method For this new method, the paper discusses many factors including changing the volume of the basin, the number of operating turbines and gates and forecasting the tidal amplitude and the characteristic curve of turbine and gate. Finally we verified that it can increase about 2% an annual power generation compared with the conventional method using the original operational function made in the plant design process.
단류식 창조발전의 조력발전소 최적화 운영 Model 개발에 관한 연구
김현한(Kim Hyun-Han),김만기(Kim Man-Kie),김준규(Kim June-Kyou),옥연호(Ok Yeon-Ho),김광호(Kim kwang-Ho),정종찬(Jeong Jong-Chan) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
Tidal power station is using the difference of the ebb and flow and the single action tidal power is dependent on tide amplitude and basin volume. Therefore the inflow of basin in rainy season has also effect on the daily power. Also if operating units are changed then starting head too changed. Therefore the number of units are very important for the optimization model. According to our study the primary point when we make a determination of optimization is starting head and governorl control mode. On this study optimization model for tidal power station is considered all of this conditions
김현애 ( Hyun Ae Kim ),이상한 ( Sang Han Lee ),최영철 ( Young Cheol Choi ),박관호 ( Kwan Ho Park ),황재삼 ( Jae Sam Hwang ),김남정 ( Nam Jung Kim ),남성희 ( Sung Hee Nam ) 한국잠사학회 2013 한국잠사곤충학회지 Vol.51 No.2
The fibrinolytic activity of aqueous extracts from Korean indigenous insects were studied. Fibrinolytic activity of aqueous extract from 5 insects (larva and adult parts of Meloimorpha japonica, Allomyrina dichotoma, Cetonia pilifera, Apis mellifera) showed 2.7-fold potent than that of plasmin used as a positive control. In addition, the fibrinolytic activity was observed through the degradation products by SDS-PAGE. The extracts efficiently hydrolyzed α-, β- and γ chains of human fibrinogen. This study suggested that aqueous extracts from Korean indigenous insects have potential in developing a useful source of antithrombosis agent (s).
최근 10년간(1988~1998) 경기지역 소아에서 A형 간염의 역학적 변화 및 임상에 관한 연구
김현,김종현,김동언,허재균,이원배,서병규,강진한,Kim, Hyun,Kim, Jong Hyun,Kim, Dong Un,Hur, Je Kyun,Lee, Won Bae,Seo, Byung Kyeu,Kang, Jin-Han 대한소아감염학회 1998 Pediatric Infection and Vaccine Vol.5 No.2
목 적 : 오염된 식수나 음식물에 의하여 전파되는 A형 간염은 전세계적으로 과거에 비해 현저한 발생 감소를 보이고 있고 국내에서도 1980년대 중반 이후부터는 돌발적 유행 양상은 소실되었고 매우 적은 수의 산발적 발생안 보고 되고 있다. 그러나 최근에 와서 성인과 소아에서 A형 간염이 점차 증가하는 추세를 보이고 있어 저자들은 최근 10년간 경기지역의 15세 이하의 소아에서 A형 간염의 역학적 변화와 이들 환아의 임상적 특성에 관하여 연구를 실시하였다. 대상 및 방법 : 1988년 7월부터 1998년 8월까지 경기지역에 있는 가톨릭대학교 의과대학 성모자애병원, 성가병원, 의정부성모병원, 성인센트병원에 임원된 환아중 혈청학적으로 A형 간염으로 진단된 환아들의 의무기록을 통하여 후향적으로 A형 간염의 연별, 월별, 연령별, 성별 발생상태와 발생과 연관된 역학적 특성, 그리고 임상적 특성, 경과 및 합병증 등에 관하여 분석하였다. 결 과 : 1) 연구 기간동안 46명이 A형 간염으로 진단되었고, 이들 환아중 28명(60.1%)이 1998년에 집중적으로 발생되었다. 2) 이들 환아는 연중 3월에서 7월 사이에 주로 발생되었고 또한 10세 이상의 연령(37명, 80.4%)에서 발생되었으며 남녀비는 1.2:1.0이었다. 3) 연구 환아들 부모의 사회경제 및 교육 정도는 중등도 이하가 각각 97.8%. 87.0%으로 낮았다. 그리고 이들 환아는 원인이 뚜렷하지 않고 집단적 발생은 없었으나 2례에서 가족내 발생이 확인되었다. 4) 임상적으로 내원시 이들 환아의 주소는 구토 및 구역, 황달, 식욕부진, 경미한 발열, 권태감, 복통, 상기도증상, 소화장애, 짙은 소변, 두통, 설사의 순으로 호소하였고, 진찰소견상에서는 황달, 간비대, 우상복부 압통, 비장종괸, 좌하복부 압통의 순으로 이상 소견을 보였다. 5) 간기능 검사상 전례에서 비정상적인 소견과 담즙 정체성 간염의 소견이 관찰되었으나 이들 소견은 2~4주 사이에 정상화되었다. 또한 복부 초음파 및 간동위원소 검사상 당낭벽 비후, 간비대, 비장비대, 복수 등의 소견이 관찰되었다. 6) 이들 연구 환아들의 평균 임원일 수는 11.1일이었고 전례에서 합병증 없이 좋은 경과를 보였다. 결 론 : 최근 10년간 경기지역에서 A형 간염의 발생의 양상은 사회경제 및 교육 정도가 낮은 가정의 10세 이상의 연령 소아에서 1998년도에 집중적으로 발생되고 있음을 알 수 있었고, 전례에서 비정상적인 간기능 소견이 관찰되었고 다수에서 담즙 정체성 간염의 양상을 보였으나 합병증 없이 좋은 임상 경과가 있었음을 확인하였다. Purpose : Worldwidely, the incidence of the hepatitis A has been markedly decreased in the past years. Also in Korea, there has been only a few sporadic cases without evidence of epidemics since the mid 1980s. However, the incidence of the hepatitis A in young adults and childen has been in trends of increasing since 1996. So, we retrospectively performed the study on the epidemiolgical changes and the clinical feature of hepatitis A in childen, living in Kyung-gi province, since 1988 to 1998. Methods : The four affiliated hospitals of the Catholic University of Korea, Our lady of Mercy's hospital, Holy family hospital, Eui-Jung-bu St. Mary's hospital, and St. Vincent hospital, were enrolled in this study. We conducted statistical analysis on the incidence of hepatitis A since 1988 to 1998, concerning with the period (monthly, annually), age, sex and related epidemiological property, by reviewing the hospital records of the patients with hepatitis A. We simultaneously performed the study concerning with the clinical characteristics of hepatitis A. Results : 1) During the study period, 46 children was diagnosed as hepatitis A, and among them 28 children (60.1%) developed sporadically in the 1998. And sex ratio was 1.2(male):1(female). 2) Most of the patients developed between March and July, and hepatitits A were mainly developed in the patients above the 10 year old ages(37 patients; 80.4%). 3) The socioeconomic and educational status of the patient's parents was almostly below the middle and low class. Although, we could not find the etiological factors in most cases, but we found the evidence of interfamilial transmission in one family. 4) The patients complained the symptoms of nausea and vomiting, jaundice, poor appetite, mild fever, fatigueness, abdominal pain, URI symptom, dyspepsia, dark urine, headache and diarrhea in order, and findings of jaundice, hepatomegaly, RUQ tenderness, splenomegaly and LLQ tenderness in order were seen. 5) All patients showed abnormal findings of the liver function tests, and the pattern of cholestatic hepatitis were seen in most cases, but these findings were normalized within the 2~4 weeks. The findings of the gall bladder wall thickening, hepatomegaly, splenomegaly and ascites were seen on abodominal sonogram. 6) The prognosis of all patients were good without complications, except in one case who had the episode of transient recuurence. And the mean hospitalization dates were 11.1 days. Conclusion : We found that the incidence of hepatitis A showed the increasing trend, and peaked in the 1998 in Kyung-gi province children. And hepatitis A mainly developed in children above the 10 year old ages. The scioeconomic and educational status of patient's family was almostly below the middle class. All of them showed abnormal liver function, and clinically cholestatic hepatitis features were seen in most cases. But, the prognosis was excellent without complication in all cases.
김현한(Kim Hyun-Han),김준규(June-Kyou),옥연호(Ok Yeon-Ho),남진극(Nam Jin-Geuk),최형철(Choi Hung-Chol),한광용(Han Gwang-Yong),김광호(Kim kwang-Ho) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
Tidal power station is using the difference of the ebb and flow and the each generator power is changed by proportioned a tide height. In case of hydro power, we consider maximum efficiency during operation but in case of tidal power, maximum power operation according to change height of tide. And there is no need to change power under grid condition. Because the tidal power station is new & renewable energy so it is classified non central electric supply power station. On this study analyze characteristic of governor operation in tidal power and organization of operating model for the maximum output
축-토크법을 이용한 새로운 발전기 효율시험 방법의 제안
김현한(Hyun-Han Kim),옥연호(Yeon-Ho Ok),김광호(Kwang-Ho Kim) 대한전기학회 2014 전기학회논문지 Vol.63 No.4
An efficiency test for generators is generally required in case of construction of a new power plant or replacement of an existing generator. Generally, the efficiency of generator is measured by the input-output ratio under any given condition. Therefore, the best way is to directly measure the value of input and output power of a generator and calculate the efficiency values. However, it is difficult to measure a generator"s input values accurately, especially for large systems. So, we are usually measuring the losses of the generator. But for measuring these values, there are several constraints for test such as preparing additional power generator and releasing the protection relay for manual operation of auxiliary equipments. Therefore, this study suggests that a novel generator efficient test method using the shaft-torque method which can be carried out while the generator is normally operating. The reliability of the result value was verified by comparing with the efficiency test results of the conventional retardation method on IEEE Std 115-1995.