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이덕주 ( Lee Duk Joo ) 한국농공학회 2000 韓國農工學會誌 : 전원과 자원 Vol.42 No.2
The moment equations of the concentration distribution for the multi-region model are derived using the method of moment. The method originally devised by Aris is to obtain the concentration moments satisfying a given PDE (Partial Differential Equation). The method of moment is used to obtain the first five moments (0<sup>th</sup> to 4<sup>th</sup>) that satisfy the model PDE. Each moment of the concentration distribution for the model equation is plotted for the dimensionless time and gave similar results except the skewness and the kurtosis. The results of the analysis show the physical meaning of each moment. The comparisons with the number of regions or the global interaction coefficient give a possibility to determine the parameters of the multi-region model with the analytical concepts.
새만금호 회석용수 공급을 위한 금강호에서의 적정 도수량 산정
이덕주 ( Lee Duk-joo ),김태철 ( Kim Tai-cheol ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-
The connection channel for Saemangeum district is to link the lakes between Keumkang Lake and Saemangeum Lake and to dilute the polluted water flowing from Mankyung river, to accelerate desalinization in Saemangeum lake, and to satisfy the future demand of water around Saemangeum district. Therefore, this study is to investigate the surplus water in Keumgang Lake after supplying the current agricutural, life, and industrial water and to check the possibility to divert the surplus water to Saemangeum Lake
이덕주 ( Lee Duk-joo ),이호천 ( Lee Ho-chun ),이순광 ( Lee Soon-kwang ),김태철 ( Kim Tai-cheol ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-
This research developed a method for the estimation of groundwater recharge by yielding daily soil moisture content and watershed evapotranspiration from the water balance concept of the unsaturated and saturated layers in rainfall-runoff model called DAWAST. The goal of the research is to estimate the groundwater recharge fulfilling conditions of the safe discharge for any season. To meet this goal, the data of groundwater level and stream flow rate have been monitored in a study area and used to validate the model.
투석 환자에서 상완족관절 맥파속도와 승모판 혈류 속도에 의한 좌심실 이완기능 지표와의 상관관계
이제 ( Je Lee ),김석환 ( Seok Hwan Kim ),이덕주 ( Duk Joo Lee ),권오완 ( Oh Wan Kwon ),신진호 ( Jin Ho Shin ),이방헌 ( Ban Hun Lee ),이재웅 ( Jae Ung Lee ),김순길 ( Soon Gil Kim ),한상웅 ( Sang Woong Han ),김호중 ( Ho Jung Kim ) 대한신장학회 2007 Kidney Research and Clinical Practice Vol.26 No.2
목적: 투석 환자에서 동맥경직도 (arterial stiffness)의 증가는 투석 환자의 심혈관 질환으로 인한 사망에 중요한 위험 인자이다. 동맥경직도의 증가는 혈압과는 독립적으로 좌심실의 후부하를 증가시키는 인자로 정상인과 고혈압 환자에서 동맥경직도의 증가는 좌심실 이완기능 장애의 중요한 관련인 자로 알려져 있다. 이에 저자는 혈액 투석 환자에서 동맥경직도를 나타내는 상완족관절 맥파속도 (brachial-ankle pulse wave velocity; baPWV)와 좌심실의 이완기능의 지표인 승모판 혈류속도의 상관관계를 정상대조군과 비교 연구하였다. 방법: 경기도 한양대학교 구리병원의 투석환자를 대상으로 심장판막질환, 관상동맥질환, 심막질환, 대동맥 질환, 좌심실 구혈율 55% 이하의 심장 질환 환자를 제외한 48명의 환자와 같은 기간 동안에 선정된 48명의 정상 대조군을 포함한 96명을 대상으로 체형 측정 자료, 우측 상완족관절 맥파속도 (rt-baPWV) 및 심초음파 결과를 분석하였다. 결과: 수축기혈압 (128.1±19.4 vs 168.3±15.9 mmHg, p<0.01), 이완기혈압 (80.6±11.1 vs 88.2±6.2 mmHg, p<0.01), 좌심실 질량 (49.9±10.4 vs 71.8± 12.2 g/m2.7, p<0.01), rt-baPWV (1573.6±401.9 vs 1834.2±491.1 cm/s, p<0.01)는 정상인보다 혈액 투석 환자에서 더 높았다. 좌심실 이완기능 지표 중 E/A비는 차이가 없었고 E파와 A파는 혈액투석군이 오히려 높았다. 다변량 분석결과 E/A비는 대조군에서 rt-baPWV (ß=-0.403)와 좌심실 질량지수 (ß=-0.350)가 독립적으로 연관이 있었으나 혈액 투석군에서 맥박수 (ß=-0.437)와 수축기 혈압 (ß=-0.389)이 독립적으로 연관성이 있었고 남성에서는 수축기혈압이(ß=-0.667), 여성에서는 rt-baPWV (ß=-0.557)가 각각 E/A비와 독립적인 연관성이 있었다. Decelration time (DT)와 isovolumic relaxation time (IVRT)에 대해 대조군에서는 rt-baPWV (ß=-0.410, ß= 0.500)와 상관관계를 보였으나 혈액투석 환자에서는 상관관계가 없었다. 결론: 정상인에서 Rt-baPWV와 승모판 혈류 속도는 밀접한 연관성이 있는 반면 혈액투석 환자에서 Rt-baPWV와 승모판 혈류속도는 단지 여성에서만 의미가 있었다. Purpose: Arterial stiffness is a major independent risk factor for cardiovascular morbidity and mortality in hemodialysis patients. It is hypothesized that arterial stiffness factor is attributable to the structural and functional changes of left ventricle (LV) caused by increased cardiac workload. So we investigated the relationship between brachial-ankle pulse wave velocity (baPWV) and diastolic dysfunction of left ventricle using echoardiographic transmitral blood flow pattern. Methods: For 96 subjects (48 control patients, 48 hemodialysis patients), baPWV and echocardiographic indices for diastolic function, i.e. transmitral E, A, E/A, DT, IVRT were measured just before hemodialysis session. Role of baPWV was tested in a multiple regression model including age, gender, body mass index, predialysis blood pressure, heart rate, LV mass index and interdialysis weight gain. Results: In the control group, LV mass index (ß=-0.350) and rbaPWV (ß=-0.403) had an independently correlation with E/A ratio. Rt-baPWV was independently correlated with DT (ß=-0.410) and IVRT (ß=0.500). In the hemodialysis group, systolic blood pressure (ß=-0.389) and heart rate (ß= -0.403) were the factors of E/A ratio. Rt-baPWV (ß=-0.557) was the factor determining E/A ratio only in female hemodialysis patients. Conclusion: PWV is independently correlated with E/A ratio only in female hemodialysis patients. Their relationship is limited or weak compared to normal control group.
Preferential 흐름에 의한 토양 내의 다영역 용질이동 모델
안병기 ( Ahn Byoung Gi ),이덕주 ( Lee Duk Joo ) 한국농공학회 2000 韓國農工學會誌 : 전원과 자원 Vol.42 No.2
A multi-region model for solute transport through saturated soils has been developed to describe preferential flow. The model consists of numerous discrete pore groups, which are characterized by a discrete dispersion coefficient, flow velocity, and porosity. The hydraulic properties for each pore group are derived from a soil's hydraulic conductivity and soil water characteristic functions. Flow in pore group is described by the classical advection-dispersion equation (ADE). An implicit finite difference scheme was applied to the governing equation that results in a block-tridiagonal system of equations that is very efficient and allows the soil to be divided into any number of pore groups. The numerical technique is derived from methods used to solve coupled equations in fluid dynamics problems and can also be applied to the transport of interacting solutes. The results of the model are compared to the experimental data from published papers. This paper contributes on the characteristics of the method when applied to the parallel porosity model to describe preferential flow of solutes in soil.
생태ㆍ경관ㆍ친수ㆍ수질을 고려한 갑천 유역의 하천유지유량 산정
김태철 ( Tai-cheol Kim ),이덕주 ( Duk-joo Lee ),문종필 ( Jong-pil Moon ),이재면 ( Jae-myun Lee ),구희진 ( Hui-jin Gu ) 한국농공학회 2007 한국농공학회논문집 Vol.49 No.6
In order to make the way to determine the instream flow more practically, we have investigated many case studies and reviewed reports and papers. To validate instream flow level suggested by the case studies, DAWAST and HEC-RAS model were applied to the Gap-stream watershed in Daejeon city. Flow-duration analysis was performed both with the stream flow data gauged in the Indong, Boksu, and Hoeduck stations, and with the stream flow data estimated by the DAWAST model and the specific discharge method. Instream flow was determined among the flow-duration analysis, DAWAST, HEC-RAS model and mass balance approach. It was satisfied with various factors such as target water quality, water depth for eco-system and resorts, water surface width, flow velocity for landscape in dry season. The study suggested that the mean low flow could be replaced into the instream flow for the preliminary study because the instream flow considering ecosystem, landscape, water-friendly environment and water quality was generally close to the mean low flow.