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RISS 인기검색어
- 검색키워드
- 저자 : 손경환(Kyung Hwan Son) (검색결과 22 건)
- 무료
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손경환,이문환,배덕효,Son, Kyung-Hwan,Lee, Moon-Hwan,Bae, Deg-Hyo 한국수자원학회 2012 한국수자원학회논문집 Vol.45 No.2
본 연구에서는 지표수문해석모형을 활용한 동아시아 지역의 유출해석을 수행하고 그 적용성을 평가하였다. 이에 전지구자료를 수집한 후 모형의 입력자료로 재구성하였으며, 모의 결과의 검증을 위해 GRDC에서 제공하는 국외 34개 지점의 관측유량자료를 수집하였다. 쾨펜의 기후대 구분을 통한 매개변수 전이 방법을 이용하여 미계측지역의 유출 매개변수를 결정하였으며, 동아시아지역에 유출해석을 수행하였다. 그 결과 미계측지역으로 가정한 17개 유역에서 모의치가 관측치와 유사하게 거동하는 것으로 나타나 결과의 신뢰성이 높음을 확인하였다. 최종 결정된 매개변수로부터 동아시아 전역에 수문성분을 산정하였으며, 대체로 동아시아 지역의 국가들의 수문성분 거동은 계절별로 유사한 것으로 확인되었다. 또한, 중국의 남부지역, 일본 및 대만은 동아시아 내에서도 유출의 발생이 가장 높은 반면, 몽골 및 중국 북부지역에서는 매우 낮은 것으로 분석되었다. The objective of this study is to evaluate the applicability of Land Surface Model (LSM) for estimating the runoff on East Asia. Global geographical and weather data are used as input for the model and for the model verification, the simulated runoff results are compared with observed data from 34 global observation stations provided by Global Runoff Data Center (GRDC). K$\ddot{o}$ppen's climate zone is used to calculate the model parameter for ungaged basins. As a result, the simulated runoff shows good performance comparing with observed data in 17 basins assumed as ungaged basins. The Hydrologic components on East Asia area are estimated from the model and the continental water balance components are seasonally similar to each country. Also, it reveals that runoffs from southern China, Japan and Taiwan are much higher than those from mongolian and northern China.
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손경환,배덕효,Son, Kyung Hwan,Bae, Deg Hyo 한국수자원학회 2015 한국수자원학회논문집 Vol.48 No.7
This study constructs the drought outlook system using ESP(Ensemble Streamflow Prediction) method and evaluates its utilization for drought prediction. Historical Runoff(HR) was estimated by employing LSM(Land Surface Model) and the observed meteorological, hydrological and topographical data in South Korea. Also Predicted Runoff(PR) was produced for different lead times(i.e. 1-, 2-, 3-month) using 30-year past meteorological data and the initial soil moisture condition. The HR accuracy was higher during MAM, DJF than JJA, SON, and the prediction accuracy was highly decreased after 1 month outlook. SRI(Standardized Runoff Index) verified for the feasibility of domestic drought analysis was used for drought outlook, and PR_SRI was evaluated. The accuracy of PR_SRI with lead times of 1- and 2-month was highly increased as it considered the accumulated 1- and 2-month HR, respectively. The Correlation Coefficient(CC) was 0.71, 0.48, 0.00, and Root Mean Square Error(RMSE) was 0.46, 0.76, 1.01 for 1-, 2- and 3-month lead times, respectively, and the accuracy was higher in arid season. It is concluded that ESP method is applicable to domestic drought prediction up to 1- and 2-month lead times. 본 연구에서는 ESP (Ensemble Streamflow Prediction)기법을 활용한 가뭄전망 체계를 구축하고 가뭄예보에 있어 활용성을 평가하였다. 과거 관측 수문기상 및 지형정보를 이용하여 우리나라 전역에 지면모델(Land Surface Model, LSM)을 구축하고 유출량(Historical Runoff, HR)을 생산하였다. 또한, 모의기간 동안 과거 30개 기상자료와 초기 토양수분량을 이용하여 선행시간별(1, 2, 3개월) 전망된 유출량(Predicted Runoff, PR)을 생산하였다. 평가결과 여름 및 가을철 보다 봄철 및 겨울철에 정확도가 높았으며, 1개월 전망 이후로는 정확도가 낮게 나타났다. 가뭄지수는 국내 가뭄해석에 있어 검증된 표준유출지수(Standardized Runoff Index, SRI)를 활용하였으며, PR_SRI을 산정 및 평가하였다. 1, 2개월 전망에서는 과거 HR이 고려되어 ESP HR에 비해 정확도가 크게 개선됨을 알 수 있었다. 선행시간별 상관계수는 평균 0.71, 0.48, 0.00, 평균제곱근오차는 0.46, 0.76, 1.01로 나타났으며, 건조기에 정확도가 높게 나타나 1, 2개월 전망까지는 ESP를 활용한 국내 가뭄예보의 활용성이 높다고 판단된다.
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한국의 해상테러의 대응전략 분석과 제언 - 해상특수경비원의 인성교육 필요성을 중심으로 -
손경환 ( Kyung-hwan Son ) 한국시큐리티융합경영학회 2016 한국융합과학회지 Vol.5 No.1
Purpose: The grounds of this study is, when considering the industrial structure of traditional Korea, exporting to overseas is the main force, security consciousness of companies overseas is at a low tide. Especially, piracy and maritime terrorism is at a stake, but the effort of international community and preparation of maritime terrorism is extremely low. Methods: By analyzing international counteract and Korea‘s system of reaction based on piracy, studying characteristic and the methods of maritime terrorism and counter-terrorism, seeking present condition, problem and the way of reacting to maritime terrorism on its type, this study has its necessity need and purpose in proposing the way to foster overseas industrial security which is connected to ground security for eradicating maritime terror. Conclusion: I’d like to give two proposals to enhance overseas industrial security linked to both marine and ground security. First, it has become hard to arrange grounds on establishing overall prevention measures of piracy damages and clarifying roles of related institute. According to this, in order to Korea play a leading role, Korea has to enact ‘piracy act’ swiftly. Second, overseas industrial security linked to ground and marine has to be nurtured with cooperation of private army. To nurture overseas industrial security, I propose activating ‘3-step overseas industrial security fostering’ system.
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손경환(Son, Kyung-Hwan),신승균(Shin, Seung-Gyoon) 한국민간경비학회 2014 한국민간경비학회보 Vol.13 No.1
이 연구는 현행 우리나라 공경호의 대표조직이라 할 수 있는 대통령 경호실을 중심으로 경호 관련학과 전공자들의 공경호기관 진출방향과 문제점, 이를 활성화하는 방안을 대상으로 하여 먼저 각 대학 경호 관련학과의 현황과 재학생들의 진출분야 선호도, 대통령경호실 등을 포함한 공경호기관에 이들 학과 졸업생들의 진출 현황 등을 파악하였다. 이러한 내용들을 기반으로 하여 경호 관련학과 전공자들이 무엇 때문에 공경호기관 진출에 어려움을 겪고 있는지를 공경호기관 입직과정과 경호 관련학과의 교과과정으로 나누어 검토하였다. 또한 외국의 공경호기관에서의 경호원 선발방법을 살펴봄으로써 한국의 공경호 입직과정이 내포하고 있는 문제점들을 상호 비교 검토하였다. 공경호기관의 입직경로상의 문제점으로는 공경호기관의 선발방법의 한계, 경호 관련학과의 교과과정의 문제, 외국경호기관의 입직사례 등을 살펴보았고, 그에 대한 경호 관련학과의 공경호기관의 진출 활성화 방안으로 제한경쟁체제의 도입, 대통령경호실의 공개채용제도의 변경, 경호 관련학과의 재정립의 필요성을 알아보았다. This research investigates the current issues of career development in college students majoring in security sciences, dealing with the status of departments of security sciences established in all colleges nationwide, the students' preferences of professional field, and the employment status of graduates in public security organization areas including Presidential Security Service with priority given to South Korea's representative group 'Presidential Security Service'. Based on these arguments, this research considers why students have a trouble entering pubic security organization areas by examining the processes of employment and the curricula of the department of security sciences. Moreover, this research compares the different processes of employment in Korea with other countries and suggests their strengths and limitations. This research indicates the constraints of employing processes in public security organization areas, the problems of school curricula, and the cases of recruiting methods in foreign countries and suggests the introduction of limited competition system, the revision of open recruitment system, and the reestablishment of department of security sciences to activate career development of students majoring in security sciences.
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관동맥이 완전폐쇄된 환자에서 측부순환과 99mTc - MIBI 심근 SPECT 소견 비교
손경환(Kyung Hwan Son),김권삼(Kown Sam Kim),이무열(Moo Yel Lee),이원호(Won Ho Lee),김덕윤(Deog Yoon Kim),강흥선(Heung Sun Kang),조정휘(Chung Whee Choe),김명식(Myung Sik Kim),송정상(Jung Sang Song),배종화(Jong Hwa Bae) 대한내과학회 1997 대한내과학회지 Vol.53 No.1
N/A Objectives: The role of coronary collateral circulation in protecting myocardium after the occlusion of a supplying artery has long been debated. Recent date show that the coronary collateral circulation may partially prevent ischemia and preserve myocardial contractile function. The purpose of this study was to evaluate the relation between the grades of collateral circulation and perfusion scores of 99mTc-Heart SPECT in patients with totally coronary occlusion. Methods: We studied 44 patients with totally coronary occlusion who had been hospitalized at Kyung Hee University hospital between October, 1989 and May, 1994, Patients were classified into two groups; Group 1: patients with angina pectoris (n=21), Group 2: patients with myocardial infarction (n=23). Angiographic collateral circulation was graded from 0 to 3: 0=none, 1=filling of side branch only, 2=partial filling of the epicardial segment, 3=complete filling of epicardial segment. The perfusion score of dipyridamole stress 99mTc-MIBI Heart SPCET was analyzed with angiographic findings. Resting and stress echocardiography were analyzed to identify left ventricular wall motion abnormalities. Results: 1) When LAD was totally occluded, there were hishevcrgree of collateral circulations from RCA in group 1 and group 2. When RCA was totally occluded, there was higherdesree of collateral circulation from LAD in group 1 and group 2. 2) The degree of collateral development was higher in group 1 than in group 2 (2.5±0.7 vs. 1.8±1.0, p<0.05). 3) In 99mTc-MIBI Heart SPECT, there was no significant difference of perfusion score at stress but perfusion score was significantly higher in group I than in group 2 at rest. 4) In 99mTc-MIBI Heart SPCET, there was no difference of perfusion score between totally coronary occlusion territories in group 1 and more than 50% coronary artery stenotic territories in group 1 and group 2. 5) In stress echocardiography, ten of the 13 patients showed normal LV wall motion at rest, but 9 of these 10 patients showed LV wall motion abnormalities at stress in group l. In group 2, all 10 patients showed LV wall motion abnormalities at rest and 3 of these patients showed more aggravation of LV wall motion abnormalities. Conclusion: Collateral circulation in angina patients can prevent myocardial ischemia and preserve myocardial function at rest, but not at exercise. Collateral circulation in patients with myocardial infarction cannot preserve myocardial function at rest. and exercise. Dipyridamole stress 99mTc-MIBI Heart SPECT is one of the indirect quantification methods to evaluate collateral development and coronary flow reserve.
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