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- 저자 : 정안철(An Chul Jeong) (검색결과 14 건)
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낙동강 유역의 친환경 하천 준설을 위한 환경창 수립 방안
정안철 ( An Chul Jeong ),김성원 ( Seong Won Kim ),김민석 ( Min Seok Kim ),정관수 ( Kwan Sue Jung ) 한국환경연구원 2015 환경정책연구 Vol.14 No.4
The river environment in Korea has changed significantly after the completion of the Four Major Rivers Project due to the outdated river management methods and thus, it is necessary to modify the current river management process. A typical example of this management is dredging but it is a method that usually results in socio-environmental side effects. Therefore, in order to minimize the socio-environmental impacts of dredging, Korea is currently applying the Environmental Windows, a management practice currently being used in the United States that eliminates the risk of potentially harmful impacts of dredging. The use of statistical methods was suggested to address the issue of data insufficiency and this methodology was applied in the downstream part of the Gangjeong-Goryeong weir located within the Nakdong river basin. The results show that when performing a month of dredging, the optimal period is March whereas the optimal month to start dredging is August in case of an eight-month dredging project. If Korea’s flood season is also considered for an eight-month dredging process, then October is the optimal month to start dredging. Non-structural methods such as the Environmental Windows reduce maintenance costs and also bring only short-term side effects to the environment, as opposed to structural methods such as the development of environmentally-friendly dredging machine. Given that few studies have explored this topic in Korea, the findings and suggestions could serve as basic data in studying river dredging in the future.
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논문 : 통계기법을 활용한 충적층내 지하수-지표수 연계 특성 해석
김규범 ( Gyoo Bum Kim ),손영철 ( Young Chul Son ),이승현 ( Seung Hyun Lee ),정안철 ( An Chul Jeong ),차은지 ( Eun Jee Cha ),고민정 ( Min Jeong Ko ) 대한지질공학회 2012 지질공학 Vol.22 No.2
낙동강 하류지역 주변 충적층 지역내 설치 운영중인 27개의 지하수 관측정의 시계열 자료를 활용하여 지표수와 지하 수의 연계 특성 평가를 위한 통계적 분석을 수행하였다. 지하수위의 변화는 하천수위의 변화와 교차상관계수가 0.601로 서 연관성이 높은 것으로 분석되었으며, 이는 강우와의 교차상관계수 0.125보다 매우 높다, 지하수위 시계열 자료에 대한 주성분 분석 결과, 연구지역내 지하수위는 2개의 그룹으로 분류된다. 이중에서 그룹 A에 속하는 하천에 인접한 관측 정에서의 수위 변화는 하천수와 유사한 변동을 보이며 호우시의 지하수위 상승량도 상대적으로 크게 나타났다. 홍수 발 생에 대한 지하수 기여에 대한 추가적 이해를 위해서는 지하수위 변동 특성을 기반으로 지구화학 분석 및 온도 계측 등 이 추가적으로 수행될 필요가 있다. A statistical analysis of time series of water level at 27 groundwater monitoring wells was conducted to analyze the surface water-groundwater connectivity in the wide alluvial plains surrounding the Nakdong River, Korea. Change in groundwater level is strongly related to river water level, yielding an average cross-correlation coefficient of 0.60 1, which is much higher than that between rainfall and groundwater level (0.125). Principal component analysis of groundwater level indicates that wells in the study area can be classified into two groups: wells in Group A are located close to a river, have water levels closely related to river level, and generally show a large increase in groundwater level during heavy rainfall. On the other hand, wells in Group B located far from a river are relatively less related to river level. Including hydrologic and statistical analyses, geochemical analysis and temperature monitoring are additionally required to reveal the relationship between surface water level and groundwater level, and to assess the possibility of groundwater flooding.
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공간보간 기법에 따른 격자기반 DAD 분석 프로그램 적용
김영규,유완식,정안철,정관수,Kim, Young-Kyu,Yu, Wan-Sik,Jeong, An-Chul,Jung, Kwan-Sue 한국국토정보공사 공간정보연구원 2017 지적과 국토정보 Vol.47 No.1
호우의 평가는 관측소의 강우자료를 이용하여 호우의 지속기간과 면적에 의해 이루어진다. 호우를 평가하기 위한 방법 중 DAD 분석방법은 지속시간 및 면적에 따른 강우 깊이를 나타내기 때문에 가장 많이 사용되고 적용된다. 하지만 기존의 DAD 분석 방법은 오차를 발생시킬 가능성이 크다. 따라서 본 연구에서는 오차발생가능성을 줄인 격자기반의 DAD 분석프로그램을 이용하여 DAD를 분석하고 적용성을 검토하였다. 적용성을 검토하기 위해 3가지의 공간보간 기법을 이용하여 지점강우를 면적강우로 변환하였다. 그 후, 변환된 격자기반의 강우자료를 이용하여 DAD 분석을 실시하였다. 그 결과, 각 지속시간 별로 면적 별로 MAAR 값을 추정할 수 있었고, OK 기법을 이용한 강우자료에서 높은 적용성을 나타냈다. Assessment of a storm is accomplished by the duration and storm area rather than a simple analysis given by the ground rain gauge stations. One of the best method for assessing storm is Depth-Area-Duration(DAD) of rainfall analysis. but existing DAD analysis method is likely to possible errors. Therefore, DAD analysis and its applicability were examined using a grid-based DAD analysis program that can reduce the possibility of errors in this study. Three spatial distribution techniques were used to analyze the applicability. Then, DAD analysis was performed using the converted grid-based rainfall data. As a result, it was possible to estimate the MAAR values by area for each duration, and showed high applicability in the rainfall data using ordinary kriging technique.
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최창균(Chang Keun Choi),윤광식(Kwang Sik Yoon),이승복(Seung Bock Lee),정안철(An Chul Jeong),안병진(Byung Jun Ahn),문도호(Do Ho Moon),도승경(Sung Kyoung Doh),곽현진(Hyun Jun Kwak),김용훈(Yong Hoon Kim),이홍순(Hong Soon Lee),유수웅(Soo 대한내과학회 1998 대한내과학회지 Vol.55 No.1
Objective : Pattern with essential hypertension g ally shows the same circadian pattern as the normothensive person with a night-time reduction or DIP in blood pressure in sleep. The definition of Dipper and Non-dipper are assigned according to arbitrary criteria e.g. a night time average blood pressure which is at least 10% less than the average daytime blood pressure. Prospective evidence that the absence of an overnight dip is a strong adverse prognostic. indicator for target organ damage .Thus we investigate circardian rhythm of blood pressure, related target organ damage, its frequency & drug in hypertensive subjects. Method: 24hr ambulatory blood pressure monitoring, history taking, physical examination, fundoscopy, ECG, chest X ray, dipstick urinanlysis, serum creatinine level are performed in essential hypertensive subjects. Exclusion criteria are duration of hypertension over 5 years, DM, renovascular hypertension & heart failure. Results : Total 42 patients performed study.17 subjects classify dipper group,25 subjects classify non-dipper group. Between dipper 8c non-dipper group shows no significantly difference at stroke history, C/T ratio over 0.5 in chest X-ray, left ventrcular hypertrophy in ECG,ST-T change in ECG, proteinuria & serum creatinine level. Non-dipper group shows significantly difference to dipper group in frequency of hypertensive retinopathy and number of combined drug used subjects. Conclusion Number of hypertensive retinopathy is significantly frequency in non-dipper group. Hypertensive retinopathy is atherosclerotic complication, thus we predict other target organ damage, therefore non-dipper type circardian rhythm of blood pressure is adverse prognostic factor for target organ damage of hypertensive subjects.
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위준한(Jun Hwan Wi),안명수(Myoung Soo Ahn),정성오(Sung Oh Chung),정안철(An Chul Jeong),이승복(Seung Bok Lee),서창인(Chang In Suh),권소영(So Young Kwon),장희진(Hee Jin Chang) 대한내과학회 1999 대한내과학회지 Vol.57 No.6
Sarcomatoid carcinomas are rare neoplasms that have been described using various terms, pseudosarcoma, carcinosarcoma or spindle cell carcinoma. Sarcomatoid carcinomas are epithelial tumors with sarcomatoid components and characterized by the presence of cytokeratin in pleomorphic spindle cells. These tumors of gallbladder rarely have been reported predominantly in older women with associated gallstones and their prognosis was very poor. However, the clinical and histological data are very limited. We report a case of sarcomatoid carcinoma in gallbladder confirmed by light microscopy and immunohistochemistry.(Korean J Med 57:1048-1052, 1999)
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