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남강댐 유역의 네 가지 하천유량자료 확장방법 비교 및 평가
김경훈 ( Gyeong Hoon Kim ),정강영 ( Kang Young Jung ),윤종수 ( Jong Su Yoon ),천세억 ( Se Uk Cheon ) 한국물환경학회 2014 한국물환경학회지 Vol.30 No.1
In this study, four methods for calculation of continuous daily flow was suggested using short-term or partial recording station of stream flow including missing data. Using these methods, standard flows at the outlet of unit/small basins for the management of total maximum daily loads (TMDLs) in Nam gang dam basin were estimated from full-period flow duration curve (FDC). Four methods of extension are described, and their properties are explored. The methods are regression (REG), regression plus noise (RPN), and maintenance of variance extension types 1 and 2 (MOVE.1, MOVE.2). In these methods, the continuous daily flow was calculated using extension equation based on correlation analysis, after conducting the correlation analysis between historic record of stream flow and long-term recording station (a base station). Finally the best optimal method was selected as the MOVE.2, and the standard flows in the abundant, ordinary, low and drought flow estimated from FDC was evaluated using MOVE.2 in unit/small basins.
수질오염총량관리 단위유역 장기유황곡선 구축 -낙동강수계를 대상으로-
김경훈 ( Gyeong Hoon Kim ),권헌각 ( Heon Gak Kwon ),안정민 ( Jung Min Ahn ),김상훈 ( Sanghun Kim ),임태효 ( Tae Hyo Im ),신동석 ( Dong Seok Shin ),정강영 ( Kang-young Jung ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.8
For the development of flow duration curves for the management of 41 Total Maximum Daily Load (TMDL) units of the Nakdong River basin, first, an equation for estimating daily flow rates as well as the level of correlation (correlation and determination coefficients) was extrapolated through regression analysis of discrete (Ministry of Environment) and continuous (Ministry of Land, Infrastructure and Transportation) measurement data. The equation derived from the analysis was used to estimate daily flow rates in order to develop flow duration curves for each TMDL unit. By using the equation, the annual flow duration curves and flow curves, for the entire period and for each TMDL unit of the basin, were developed to be demonstrated in this research. Standard flow rates (abundant-, ordinary-, low- and drought flows) for major flow duration periods were calculated based on the annual flow duration curves. Then, the flow rates, based on percentile ranks of exceedance probabilities (5, 25, 50, 75, and 95%), were calculated according to the flow duration curves for the entire period and are suggested in this research. These results can be used for feasibility assessment of the set values of primary and secondary standard flow rates for each river system, which are derived from complicated models. In addition, they will also be useful for the process of implementing TMDL management, including evaluation of the target level of water purity based on load duration curves.
김경훈(Gyeong-hoon Kim),박준일(Jun-il Park),신찬기(Chan-ki Shin) 대한환경위생공학회 2008 대한환경위생공학회지 Vol.23 No.4
The non-linear least squares model((NLSM) has long been the standard technique used by hydrologists for constructing rating curves. The reasons for its adaptation are vague, and its appropriateness as a method of describing discharge measurement uncertainty has not been well investigated. It is shown in this paper that the classical method of NLSM can model only a very limited class of variance heterogeneity. Furthermore, this lack of flexibility often leads to unaccounted heteroscedasticity, resulting in dubious values for the rating curve parameters and estimated discharge. By introducing a heteroscedastic maximum likelihood model(HMLM), the variance heterogeneity is treated more generally. The maximum likelihood model stabilises the variance better than the NLSM approach, and thus is a more robust and appropriate way to fit a rating curve to a set of discharge measurements.
김경훈(Gyeong-hoon Kim),김용석(Yong-seok Kim),박배경(Bae-kyung Park),윤종수(Jong-su Yoon),신찬기(Chan-ki Shin) 대한환경위생공학회 2008 대한환경위생공학회지 Vol.23 No.4
To drive efficiently total water pollution load management, needs to calculate the exact load emissions, pollution load allocation and implementation evaluation in each unit area of watershed and accurate and regular flow of data. For these reasons, the Nakdong River TMDL Research Center has produced directly or indirectly in the average interval of eight days (30 times or more / year) 41 points for unit area of the total water pollution load management and 8-point of municipal requirement for a total of 49 branches as a flow data in 2004 from August. This acquired the survey flow is evidence of trends and changes each point in the Nakdong River based on time, such as 10 years based on average design flow available to the foundation of the summit as the major water policy is to be utilized. This study was performed on actual discharge measuring data and introduced performance results each drainage basin of Nakdong River from 2004 to 2008 over the total of past five years.
시판 우리밀과 수입밀 전분의 구조 및 이화학적 특성 비교
정경아(Gyeong A Jeong),박진희(Jinhee Park),김경훈(Kyeong Hoon Kim),이창주(Chang Joo Lee) 한국식품과학회 2021 한국식품과학회지 Vol.53 No.5
본 연구에서는 시판중인 우리밀과 수입밀에서 분리한 전분의 구조와 이화학적 특성을 조사하고 각 전분 사이의 구조적 특성을 비교분석 하였다. 우리밀과 수입밀 전분의 아밀로즈 함량은 23.2-23.8%로 유사하게 나타났다. 전분 입자의 형태는 유사한 타원형모양으로 이루어져 있었으나, 호화온도와 종결온도의 차이는 수입밀 전분이 우리밀 전분에 비해 넓게 분포되어 있어 수입밀이 우리밀에 비해 품종 혼합이 많이 이루어져 있는 것으로 보였다. 점도 특성은 국내산 밀가루 DWS-N은 강력분인 빵의 가공적성에 적합하며, DWS-H, DWS-CJ는 중력분인 다목적 용도에 적합한 것으로 나타났다. 결론적으로 우리밀과 수입밀의 품질 특성은 글루텐 함량 뿐만 아니라 전분의 특성과도 관련이 있는 것으로 나타났다. 이 연구의 결과는 향후 우리밀을 활용한 가공식품 적용에 기초자료로 활용할 수 있을 것이다. This study characterized the chemical structure and physical properties of domestic commercial wheat starch and compared them with those of imported commercial wheat starch. Three varieties of domestic commercial wheat starch (DWS) were compared to three types of imported wheat starch (IWS). The morphology of DWS granules was spherical with diameters 17.0-18.3 μm; the IWS granules exhibited various diameter sizes (16.6-17.7 μm). The amylose content of both DWS and IWS was between 23.2-23.8%. DWS exhibited smaller gelatinization temperature ranges and gelatinization enthalpies compared to IWS. These results suggest that IWS-PW (plain wheat starch) is a mixture of many types of wheat starch. In conclusion, the quality of domestic wheat flour and imported wheat flour was related to gluten content as well as to the starch properties.
정경아(Gyeong A Jeong),박진희(Jinhee Park),김경훈(Kyeong Hoon Kim),이창주(Chang Joo Lee) 한국식품과학회 2022 한국식품과학회지 Vol.54 No.6
본 연구에서는 호주산 ASW와 국산밀 금강, 조경, 고소, 새금강, 중모2008, 황금알의 전분 구조 및 품질 특성을 조사하였다. ASW와 국산밀 6품종 전분 모두 둥근 타원 형태로 동일한 입자형태와 유사한 아밀로즈 함량을 가진 것으로 나타났다. ASW 전분의 호화개시온도와 최종온도 간의 차이(T<SUB>c</SUB>-T<SUB>o</SUB>), 호화엔탈피(ΔH)는 국산밀 6품종 전분에(14.0-15.7℃) 비해 높게 나타났다. 이는 ASW는 여러 밀품종이 혼합되어 있으며 국산밀은 단일 품종으로 이루어졌기 때문이다. 전분의 점도 특성은 황금알이 면류로 사용되는 ASW 전분보다 높은 점성이 있는 것으로 나타났다. 따라서 국산밀 품종 중 황금알은 면용 뿐만 아니라 제빵용으로도 사용이 가능한 것으로 보였다. 결론적으로 밀가루의 가공적성은 글루텐 함량 뿐만 아니라 전분의 특성과도 깊은 관련이 있는 것으로 나타났다. 이 연구 결과는 향후 수입산 밀을 대체할 수 있는 국산밀의 기초자료로 활용할 수 있을 것이다. This study aimed to compare the physicochemical and structural properties of six domestic wheat starches (DWS) and one imported Australian standard white wheat (ASW) starch. Both the AWS and six varieties of DWS exhibited the same particle shape and similar amylose content, adopting round oval shapes. The gelatinization temperature range (T<SUB>c</SUB>-T<SUB>o</SUB>) of the ASW was higher than that of the DWS (14.0-15.7℃), likely because the ASW was a mixture of several wheat varieties, whereas the DWS were composed of a single variety. The starch viscosity of the domestic wheat variety Hwanggeumal was higher than that of the ASW starch used for noodles. Therefore, Hwanggeumal was established to be a starch that can be used for noodles and baking. In conclusion, the processing properties of wheat were related to the gluten content as well as the starch properties. The results of this study can be used as the basic data for domestic wheat that can replace future imports of wheat.