농촌마을 하천의 수질관리 시스템 - 시험유역 조사 및 시스템 설계 -

정하우,최진용,김대식,박기욱,배승종 ( Ha Woo Chung,Jin Yong Choi,Dae Sik Kim,Ki Uk Park,Seung Jong Bae ) 한국농촌계획학회 1996 농촌계획 Vol.2 No.2

Development of A Single Reservoir Agricultural Drought Evaluation Model for Paddy

정하우,최진용,박기욱,배승종,장민원,Chung, Ha-Woo,Choi, Jin-Yong,Park, Ki-Wook,Bae, Seung-Jong,Jang, Min-Won The Korean Society of Agricultural Engineers 2004 한국농공학회논문집 Vol.46 No.3

This study aimed to develop an agricultural drought assessment methodology for irrigated paddy field districts from a single reservoir. Agricultural drought was defined as the reservoir storage shortage state that cannot satisfy water requirement from the paddy fields. The suggested model, SRADEMP (a Single Reservoir Agricultural Drought Evaluation Model for Paddy), was composed of 4 submodels: PWBM (Paddy Water Balance Model), RWBM (Reservoir Water Balance Model), FA (Frequency and probability Analysis model), and DCI (Drought Classification and Indexing model). Two indices, PDF (Paddy Drought Frequency) and PDI (Paddy Drought Index) were also introduced to classify agricultural drought severity Both values were divided into 4 steps, i.e. normal, moderate drought, severe drought, and extreme drought. Each step of PDI was ranged from +4.2 to -1.39, from -1.39 to -3.33, from -3.33 to -4.0 and less than -4.0, respectively. SRADEMP was applied to Jangheung reservoir irrigation district, and the results showed good relationships between simulated results and the observed data including historical drought records showing that SRADEMP explains better the drought conditions in irrigated paddy districts than PDSI.

GIS 와 농업정보망을 이용한 동적 의사결정 지원시스템

정하우,김대식,이정재,최진용,김한중 ( Ha Woo Chung,Dae Sik Kim,Jeong Jae Lee,Jin Yong Choi,Han Jung Kim ) 한국농촌계획학회 1997 농촌계획 Vol.3 No.1

농촌지역 토지이용계획 기법 연구 ( 2 ) - GIS 의 공간분석기법 이용 -

정하우,박병태,이정재,최진용 ( Ha Woo Chung,Byung Tae Park,Jeong Jae Lee,Jin Yong Choi ) 한국농촌계획학회 1995 농촌계획 Vol.1 No.2

농촌마을 개발계획 지원을 위한 토지 이용계획 모형( I ) - GIS, CA 및 MCE 법을 이용한 모형의 개발 -

정하우,최진용,김대식,Chung, Ha-Woo,Choi, Jin-Yong,Kim, Dae-Sik 한국농공학회 2002 한국농공학회지 : 전원과 자원 Vol.44 No.4

The purpose of this study is to develop a land use planning model (LUPM) which can be applied to development of rural villages considering their spatial expansion. The LUPM finds out and allocates the new built site required for the improvement of existing villages. in the development of LUPM, CA (cellular automata) and land suitability analysis methods were applied combinedly. The model uses basically numerical data of CIS based on grid data. Agglomerated settlement, as a type of village for simulation, was adopted. Probability of land use change for optimizing development area was calculated by the six criteria: slope. drainage characteristic, direction of slope, as absolute suitability of grid itself, distance from road. distance from stream and distance from the village center, as relative probability by neighborhood cells. Weighting values of these criteria were quantified by AHP (analytic hierarchy process) method, which is one of MCE(multi-criteria evaluation) method. The algorithm of the model was verified by three example villages: an isolation village, a village with horizontal road, and a village with nodal point of cross road

퍼지이론(理論)과 관개용(灌漑用) 저수지(貯水池)의 조작(操作)

정하우 ( Chung Ha Woo ),이남호 ( Lee Nam Ho ) 한국농공학회 1991 한국농공학회지 : 전원과 자원 Vol.33 No.4

The objective of this paper is to show how the fuzzy sets theory can be applied to the reservoir operation guidelines for agricultural purposes. The concepts of the theory has been resented as a new tool for the decision problems which contains fuzziness and it's application can be found in operations research, expert systems, robotics, fuzzy computers, and pattern recognition. The fuzzy control system for the reservoir operation composed of a set of reservoir operation rules and a fuzzy inference engine was built. Water demand for paddy fields, water availability, and inflow to a reservoir were selected as main factors which determine the magnitude of reservoir release. The behavior of the control system was evaluated for different level of water demand and the results seemed to be reasonable.

하천(河川) 일류출량(日流出量)의 실시간예측(實時間豫測)

정하우 ( Chung Ha Woo ),이남호 ( Lee Nam Ho ),박승우 ( Park Seung Woo ) 한국농공학회 1990 韓國農工學會誌 : 전원과 자원 Vol.32 No.3

An adaptive algorithm was applied to forecast daily stream flows in real time using rainfall data. A three-component tank model was selected to simulate the flows and its time-variant parameters were self-calibrated with updated data using a parameter optimization scheme, golden section search method. The resulting adaptive model, APTANK, was applied to six watersheds, ranging from 0.47 to 33.62㎢ size and the simulated daily streamflows were compared with the measured. The simulation results were in good agreement with the field data. APTANK is found to be applied to real-time flow simulation purposes such as a tool for irrigation water resources management and operations. The model is particularly good to simulate streamflows on dry days as compared to wet days having runoff-induced precipitation.

금강하구(錦江河口)둑 홍수예경보(洪水豫警報)시스템 개발(開發)(I) -시스템의 구성(構成)-

정하우 ( Chung Ha Woo ),이남호 ( Lee Nam Ho ),김현영 ( Kim Hyun Young ),김성준 ( Kim Seong Joon ) 한국농공학회 1994 한국농공학회지 : 전원과 자원 Vol.36 No.2

A real-time flood forecasting system(FLOFS) was developed for the real-time and predictive determination of flood discharges and stages, and to aid in flood management decisions in the Keum River Estuary Dam. The system consists of three subsystems : data subsystem, model subsystem, and user subsystem. The data subsystem controls and manages data transmitted from telemetering systems and simulated by models. The model subsystem combines various techniques for rainfall-runoff modeling, tidal-level forecasting modeling, one-dimensional unsteady flood routing, Kalman filtering, and autoregressivemovingaverage(ARMA) modeling. The user subsystem in a menu-driven and man-machine interface system.

직파재배 논의 지표관개 수리특성 -건답휴립직파 논은 중심으로-

정하우 ( Chung Ha Woo ),최진용 ( Choi Jin Yong ),김대식 ( Kim Dae Sik ),박기욱 ( Park Ki Uk ),배승종 ( Bae Seung Jong ) 한국농공학회 1997 한국농공학회지 : 전원과 자원 Vol.39 No.4

The purpose of this study is to analyze hydraulic characteristics of surface irrigation in a paddy field of direct seeding culture. Field experiment was performed in the paddy field of ridge direct dry seeding. Simulation by a numerical model was also accomplished with the data obtained from the field experiment. The model was developed by one dimensional zero-inertia equation and finite difference method. From the result of the field observation, the furrows of the experimental field were found to have various geometric characteristics. Advance distance and time were measured both in the field and by the model simulation for various furrow lengths and irrigation discharges. Roughness coefficients of each furrow were also estimated by the model.

농업용 저수지 설계를 위한 저수량 최적화 모형의 개발

정하우 ( Chung Ha Woo ),박태선 ( Park Tae Seon ),최진용 ( Choi Jin Yong ) 한국농공학회 1998 한국농공학회지 : 전원과 자원 Vol.40 No.2

The optimal reservoir storage capacity is needed to be determined at the stage of reservoir planning. The reservoir storage capacity should be based on water balance between demand and supply, and meet the water deficity during the growing season. However, the optimal reservoir storage capacity should be determined considering benefit-cost analysis for the project. In this study, Two models are developed. The one is the RSOM(Reservoir Storage Optimization Model), that is consisted by three submodels, MROPER (Modified Reservoir OPERation model), RESICO(REservoir SIze and the construction COst computation) model. And the other is the BECA(BEnefit-Cost Anaysis) model. For model application, three districts, Chungha, Ipsil and Edong were selected. The relative difference of B/C ratio between project planning data and estimation by RSOM is 17.9, 15.0 and 7.3% respectively, which may be applicable for water resources development feasibility planning.