http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
개별검색 DB통합검색이 안되는 DB는 DB아이콘을 클릭하여 이용하실 수 있습니다.
통계정보 및 조사
예술 / 패션
<해외전자자료 이용권한 안내>
- 이용 대상 : RISS의 모든 해외전자자료는 교수, 강사, 대학(원)생, 연구원, 대학직원에 한하여(로그인 필수) 이용 가능
- 구독대학 소속 이용자: RISS 해외전자자료 통합검색 및 등록된 대학IP 대역 내에서 24시간 무료 이용
- 미구독대학 소속 이용자: RISS 해외전자자료 통합검색을 통한 오후 4시~익일 오전 9시 무료 이용
※ 단, EBSCO ASC/BSC(오후 5시~익일 오전 9시 무료 이용)
Recent frequent hard droughts and sharp increase of water demand elicited by economic development cause water shortage, which induce great interest in groundwater development. This present study is designed to provide information required for groundwater storage according to precipitation by examining antecedent hydrologic phenomena and mechanical behavior of groundwater recharge and groundwater storage. The necessary data has been collected both at the stations (Koan, Chungpyung and Choongju) located on the basin of Han River and at the stations(Jindong, Hyunpoong and Waekwan)located on the basin of Nakdong River. Master groundwater depletion curve is formed on the base of outflow hydrograph and by applying it to linear depletion equation, total potential groundwater discharge(V??), actual groundwater discharge (V??) and remaining potential groundwater discharge(V??) are computed. Groundwater recharge and groundwater storage are infferd from their inter-relationships. Such observations has yielded the following results ; on the basins of Han River and Nakdong River, groundwater Recharge and groundwater storage are greater than their annual means in the year when the precipitation is greater than its annual means, whereas groundwater recharge and groundwater storage are lower their annual means in the case where they mark less than mean annual precipitation ; Characteristics of vareability of seasonal groundwater storage range within a certain limit (usually 0~50);The relation between seasonal precipitation and groundwater storage is constant in the relation between total precipitation during January to May and groundwater storage of March to May. The relation between the total precipitation of June to September and groundwater storage of July to September is also constant. The individual equations of the basin are offered.
Recent technical advancement allows noninvasive measurement of blood glucose. In this literature, we reviewed various noninvasive techniques for measuring glucose concentration. Optical or electrical methods have been investigated. Optical techniques include near-infrared spectroscopy, Raman spectroscopy, optical coherence technique, polarization, fluorescence, occlusion spectroscopy, and photoacoustic spectroscopy. Electrical methods include reverse iontophoresis, impedance spectroscopy, and electromagnetic sensing. Ultrasound, detection from breath, or fluid harvesting technique can be used to measure blood glucose level. Combination of various methods is also promising. Although there are many interesting and promising technologies and devices, there need further researches until a commercially available non-invasive glucometer is popular.
Generally, as the fluid volume increases, the degree of contamination should decreases. However in the target area of this study which involves Anseong River, as the fluid volume increases from the draught vol., degree of contamination has increased also. The results of this study has been found as the following. 1) As the fluid vol., increases from low flow vol., average flow vol., self-purification capacity of the river increases and the degree of contamination shoud decrease. But as the fluid vol. increases, we see that the degree of contamination increases prapartionately and this is assumed to be due to NPS and the phenomenon of flatation of contamination sediments on the bottom of the river. 2) We are able to determine the flow in propotion to quality of load quantity through an anniversary of analysis revealed linear relationship. 3) Using an anniversary of analysis, we were able to predict seasonal amount of floating contaminants per fluid vol. 4) Using this result, we determined the amount of diluting agent (base on the 2nd. degree of water according to Environment preservation directive) to be increasing in linear relation to the fluid vol. of the river and seasonal changes would be expected to have a similar effect.
본 연구에서는 표고차가 다른 두 개의 방류구를 가진 다목적댐을 포함하는 중소하천을 네트웍으로 나타내고, 비용과 편익을 고려한 순별 최적 물분배모형을 수립하고자 하며, 이를 위한 최적운영모형은 정상운영모형과 비정상운영모형으로 구성되어진다. 정상운영모형은 수요량을 만족하면서 수자원분배시 발생하는 비용과 발전으로 인한 편익의 차를 최소로 하는 모형으로, 발전함수의 비선형성으로 인하여 비선형계획법문제가 되며, 비정상운영모형은 정상운영모형을 적용할 수 없을 경우 수자원의 부족으로 인한 물부족량이 최소가 되도록 하는 모형이다. 해당 순부터 기준시점까지의 수자원 부존량을 고려한 최적운영방안을 도출하고, 이때 필요한 저수지유입량 및 농업용수 수요량은 추계학적 모의모형을 이용하여 구하였다. 정상운영모형의 경우, 최대 1500여개의 결정변수로 이루어진 비선형계획법문제이므로, Frank-Wolfe alogrithm을 이용한 축차선형계획법으로 풀이하였다. 본 연구의 대상유역으로는 섬진강댐과 동진강유역을 포함하는 동진농지개량조합 관내를 선택하였으며, 최적운영모형을 적용한 결과, 실제 운영에서 발생한 물부족이 해소되었고, 발전량이 증가하였다. The objective of this study is to develop an optimal operation model for the distribution of surface water resources in an agricultural river basin which has a multi-purpose dam with two oulets of different elevation. The optimal model consists of two models ; normal period model and abnormal period model. The normal period model minimizes the difference between the cost and benefit under the condition of satisfing all the agricultural water demand. When the water level in the dam becomes lower than a certain level for current period, the abnormal period model is called upon, and it minimizes the deficits of agricultural demands. The normal period model is a nonlinear programming problem due to the nonlinearity inherent in the objective function which takes the hydropower generation into account. Since the model has too many variables to be solved directly by an existing NLP solver, a successive linear programming technique using the Frank-Wolfe algorithm is utilized for the appoximate solution. The abnormal period model is LP problem. Since the model recursively computes the water resource supplies to demands from any operation period to the end of the water year, it requires a sequences of reservoir inflows and agricultural demands to be synthetically generated. A stochastic model is employed to generate the sequence of the variables. Dongjin Agricultural Unit, which includes Sumjin multi-purpose dam and Dongjin river basin, is selected for the application of the model. The results showed that hydropower generated was significantly increased, and that all the agricultural demands were satisfied for the duration of analysis, which was not the case for the past real system operation.
The present time, there is used SCS curve number method to calculate effective rainfall and is necessary to choose AMC-condition in calculating design floods. By standard real runoff records AMC-Ⅱ condition is computed smaller CN-values than ideal CN-values and AMC-Ⅲ condition is computed larger CN-values than ideal CN-values. Therefore, there is able to applicate CN-37 or CN-55 to calculate optical effective rainfall as choosing AMC condition. This study analysis of the peak flow sensibility according to curve number used to this four way. To this analysis, it applied that time distribution model is Huff method, computing effective rainfall method is SCS, computing flood discharge method is SCS, Snyder and Clark using HEC-1, WMS program estimated flood discharge and geographic parameter.