• 한국농공학회지
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• 제26권3호
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• pp.90-98
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• 1984

In this paper, the anthor made a basic study of the storage function model and examined several constants in applying the storage function model to flood run-off analysis by dealing with the data in the Supyung and Hoyng Syung watershed, the applicabilities of the storage function model are examined by searching this optimum model parameters in two watersheds. The results are summarized as follows, 1) The optimum values of the exponential constants, P, in the storage function model showed to be 0.77 to 0.87 in two watersheds observed, therefore it was confirmed that the storage fumction model was approaching to the surface runoff model. 2) It was confirmed that the interval of variation of the storage constant, K, Showed to be larger than that of the exponential constant, p. 3) Relative erros in the discharge obtained by using the storage function model and the SDFP mothod showed to be 20 and 17 percent respectively to the observed discharge, therefore it was confirmed that the applicability of the storage function model using the SDFP method are excellent for runoff analysis. 4) A simple method is proposed for estimating the lag time in the storage function model.

• 한국농공학회지
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• 제37권5호
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• pp.73-80
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• 1995

The uses of stage-storage curve function are diverse in irrigation reservoirs. The curve functions would be used to determine the optimal size of spillway length and the inundation area above full water level based on the flood routing in reservoirs. In addition, the curve function would he used to transform the stage to the storage for the reservoir water management, in which the storage is the supply water. Besides those, the curve is necessary for the planning of dredging, the estimation of the effective and the dead storage, the drought management by reservoir, etc. The curve function data, however, are almost unavailable for these purposes. According to the statistics, about 74% of the 2, 900 resevoirs which are maintained by Farm Land Improvement Association have no more effective data. Therefore, the simulation of the curve function could be better alternative. The curve functions were simulated derivating the regression equations based on the basin relief ratio and the effective depth. The results of the verification show the enough reliability of the application to generate the curve function in some reservoirs which do not have the surveyed stage-storage data. Also, even though the averaged curve function would be applicated without the basin relief ratio data, the result shows that the simulated curve is closer to the real one than the linear function by only the existing effective storage data.

• 설비공학논문집
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• 제22권10호
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• pp.719-726
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• 2010

In this paper, the appropriate thermal storage time of an air-conditioning system with slab thermal storage was considered by use of summer measurement values. Two standards of heat extraction rate and criterion function were established as the standard that evaluates appropriateness. When heat extraction rate was a standard, zero hour and seven hours were obtained as appropriate thermal storage time, in the case of evaluation by energy consumption and running cost individually. Also, when criterion function was a standard, the difference between energy consumption and running cost was small, it was because the weight function to room air temperature deviation was much bigger than heat extraction rate.

• 한국농공학회지
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• 제38권2호
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• pp.75-86
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• 1996

The formulas for estimating the constants of storage function model including K and TL for runoff analysis and a distributed storage function model are discussed in this study. First, the relations between parameters of the storage function model and the kinematic runoff model are theoretically examined, and then optimum constants of storage function model are obtained by the Standardized Davidson-Fletcher-Powell (SDFP) method. Through this analysis, theoretical formulas were obtained as $K = 0.63 {\alpha} KsB{^0.6}$ and $T_{L}=0.11 {\alpha} KsB{^0.6} r{^0.4} {_e}$, which are difficult to use practically because of the unclarified definition of shape factors. From a practical point of view, empirical formula were derived as $K=15.6{^0.3} {_m}$ and $T_{L}=2.1B{^0.36} {_m} {_e}/r{^0.4} {_e}$ for applied watersheds. The proposed formulas are verified for several recoded floods at a few points of watersheds. It is also found that the distributed storage function. can be applied to flood runoff analysis using the new formulas aboved mentioned.

• 설비공학논문집
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• 제20권10호
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• pp.702-709
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• 2008

In this paper, the optimal thermal storage time of an air-conditioning system with slab thermal storage in office building was analyzed on the basis of the gradient method algorithm. The sum of room temperature deviation and heat extraction rate was set to the criterion function. It was calculated that four hours is the optimal thermal storage time under the standard evaluation criterion. Furthermore, some case studies were executed by controlling ratio of weight functions of room temperature deviation and heat extraction rate in criterion function. It is possible to design many kinds of optimal operation of an air-conditioning system with slab thermal storage by controlling ratio of the weight functions in criterion function.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 추계종합학술대회 논문집
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• pp.426-429
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• 1999

Many similar class components are stored in object-storage but the object-storage has needed the retrieval function of correct component for reuse. Accordingly this paper designed the class component retrieval viewer of the object-storage by using the improved spreading activation strategy. Object-storage has made up of information of inheritance relation, superclass, subclass, and we defined the queries about each class function. Also we specified connectionist relaxation of the each class and query, finally we gained retrieval result which showed highest activation value order of class component information including the query function.

• 한국수자원학회논문집
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• 제52권12호
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• pp.1057-1066
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• 2019

저류함수법은 비선형성을 가지는 실제 강우-유출 관계를 해석하기 위한 방법으로 우리나라 4개 홍수통제소의 홍수예측모형으로 이용되고 있다. 정확한 유출해석을 위해서는 정확한 저류함수의 매개변수 산정이 중요하나, 현재 사용되고 있는 저류함수법의 매개변수는 제한된 수문사상 분석에 의해 작성된 2012년도 경험식에 의해 추정된 것으로 정확도가 낮은 실정이다. 운동파법은 유역 및 하도의 물리변수에 기초한 방법으로 강우-유출 해석에 많이 이용되고 있다. 운동파법의 변환에 의한 2항 저류함수법을 채택하면 물리변수를 기반으로 매개변수를 추정할 수 있어 유출계산의 정확도가 증가할 수 있다. 유역유출에서 중요한 물리변수인 등가조도는 토지이용 및 토지피복을 이용하여 쉽게 구할 수 있으며, 하도유출의 물리변수는 하천기본계획 보고서 및 지형도 등에서 쉽게 구할 수 있어 매개변수의 추정이 매우 용이한 장점이 있다. 본 연구에서는 2항 저류함수법의 운동파법 재현성을 검토하였고, 한강권역 홍천강의 지류인 내촌천을 대상으로 2항 저류함수법의 적용 가능성을 검토한 바, 경험식에 의한 매개변수를 이용한 기존 1항 저류함수법보다 정확한 유출계산 결과를 얻을 수 있었다. 미계측 유역 및 하도에서도 물리변수를 이용하여 매개변수를 용이하게 추정할 수 있기 때문에 저류함수법의 활용도가 증가될 수 있을 것으로 기대된다.

• International journal of advanced smart convergence
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• 제9권3호
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• pp.183-191
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• 2020

Today, taking photos using smartphones has become an essential element of modern people. According to these social changes, modern people need a larger storage capacity, and the number of unnecessary photos has increased. To support the storage, cloud-based photo storage services from various platforms have appeared, and many people are using the services. As the number of photos increases, it is difficult for users to find the photos they want, and it takes a lot of time to organize. In this paper, we propose a cloud-based photo management service that facilitates photo management by classifying photos and recommending unnecessary photos using deep learning. The service provides the function of tagging photos by identifying what the subject is, the function of checking for wrongly taken photos, and the function of recommending similar photos. By using the proposed service, users can easily manage photos and use storage capacity efficiently.

• 산업경영시스템학회지
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• 제25권4호
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• pp.40-45
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• 2002

An AS/RS construction cost minimization model under throughput rate requirement constraint has been developed, whose objective function includes S/R machine cost, storage rack cost, and interrace conveyor cost. S/R machine cost is a function of the storage rack height, the unit load weight, and the control logic used by the system, while storage rack cost is a function of the storage rack height, the weight and the volume of the unit load. Since the model is a nonlinear integer programming problem which is very hard to solve exactly with large problem size, a solution procedure is developed to determine the height and the length of the storage rack with a fixed number of S/R machines, while increasing the number of S/R machines one by one to meet the throughput rate requirement.

• 한국수자원학회논문집
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• 제44권5호
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• pp.407-416
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• 2011

본 연구에서는 저수지의 저류량-유출량 관계를 비선형 저수지 모형으로 표현하고, 이를 근거로 저수지의 저류특성을 이론적으로 정량화하였다. 비선형 모형으로는 지수함수, 로그함수 및 멱함수 형태를 고려하였으며, 이 중 저류량-유출량 간의 관계를 지수함수로 표현한 경우가 가장 적절한 것으로 판단되었다. 제안된 모형은 충주댐 및 소양강댐에 적용하였으며, 그 결과로 충주댐의 홍수기 저류효과는 약23시간, 소양강댐의 홍수기 저류효과는 약 43시간 정도로 추정되었다. 이러한 결과는 비록 댐의 규모 및 총 저수용량은 비슷하지만 유역면적 및 유입량에 비해 댐의 규모가 상대적으로 작은 충주댐이 소양강 댐에 비해 충분한 저류효과를 거두지 못하고 있음을 의미한다.