• The Korean Journal of Applied Statistics
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• 제22권5호
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• pp.911-921
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• 2009

Receiver Operating Characteristic(ROC) and Cumulative Accuracy Profile(CAP) curves are two methods used to assess the discriminatory power of different credit-rating approaches. The points of optimal classification accuracy on an ROC curve and of maximal profit on a CAP curve can be found by using iso-performance tangent lines, which are based on the standard notion of accuracy. In this paper, we offer an alternative accuracy measure called the true rate. Using this rate, one can obtain alternative optimal threshold points on both ROC and CAP curves. For most real populations of borrowers, the number of the defaults is much less than that of the non-defaults, and in such cases the true rate may be more efficient than the accuracy rate in terms of cost functions. Moreover, it is shown that both alternative scores of optimal classification accuracy and maximal profit are the identical, and this single score coincides with the score corresponding to Kolmogorov-Smirnov statistic used to test the homogeneous distribution functions of the defaults and non-defaults.

• Land and Housing Review
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• 제13권1호
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• pp.113-129
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• 2022

A building's eco-friendliness is directly related to various values including the life cycle cost of a building. However, the conventional architectural design method has a limitation in that it cannot create an optimized case according to the surrounding environmental conditions. Therefore, the purpose of this research is to present a design assistance tool that can review planning cases optimized for the environmental conditions of the building site in the planning stage of architectural production. To achieve the purpose of the study, an algorithm for realizing 3D modeling of the region and analysis of the solar environment was produced based on the site contours, building, and road information from the digital topographic map provided by the National Geographic Information Institute. To examine the validity of the developed algorithm, a comparative experiment was conducted targeting the elevation direction of the existing building. As a result, it was found that the optimal elevation direction selected by the algorithm can receive higher insolation compared to the front facade of the main building.

• Proceedings of the Korea Association of Information Systems Conference
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• 한국정보시스템학회 2000년도 춘계학술대회
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• pp.33-38
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• 2000

본 연구는 대학의 정보처리 전공에 적합한 교육과정 개발과 관련해 특성화된 전문대학의 교육과정, 산업체 요구사항 및 편입 등을 기존의 교육과정과 비교, 분석하고 문제점을 개선하여 최적 대안을 제시하고자 한다.

• The Journal of the Korea Contents Association
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• 제12권1호
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• pp.485-499
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• 2012

With the maturity of department stores and discount stores, many Korean retail companies have an interest in developing outlet shopping centers such as Yeoju Premium Outlet so on. To develop a successful outlet shopping center, developers should understand consumer's preferences on many attributes of development alternatives. This study analyzes consumer's preferences on outlet shopping center and evaluates various development alternatives by using conjoint analysis. With empirical research for outlet shopping center development, this study can elicit potential shopper's preference for outlet shopping center. The empirical result shows discount rate is most important attribute to develop outlet shopping center. The potential shoppers have higher preference for higher discount rate. Location is the second important attribute. Brand is the least important attribute. By using utilities derived from analysis, this study performs various choice simulations. Through choice simulation analysis, this study tries to find the best development alternative for new outlet shopping center.

• Water for future
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• 제18권4호
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• pp.347-359
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• 1985

This study aims at the development of DP-Model for the establishment of monthly optimal operation policy of single multi-puppose reservoir by which the water demand of downstream can be satisfied under the various physical constraints. Series, A. B. C. of inflow are selected out of future monthly inflow data which are simulated form the past monthly average inflow of Andong dam site. the neight possible alternatives in each inflow series are established in order that Andong dam can supply the water demand of Nagdong main stream of 30% to 100%. Nextly, the reservoir rule curves is derived for each alternative by the detailed seguential analysis of stroage, future inflow and water demand based on the reservoir continuite equation. Then, and alternative which can satisfy the objective function of system based on the rule curves in the exteream is determined as an optimal operation policy from the application of developed DP=Model.

• Korean Journal of Construction Engineering and Management
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• 제10권4호
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• pp.101-110
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• 2009

The current virtual reality(VR) simulation functions in construction project are focused on the construction phase. This study attempts to extend the application of VR functions to the design phase. This study suggests various VR functions such as earthwork simulation by road alignment, alternative route selection simulation, structure type selection simulation and underground structure visualization simulation. These functions can visualize road route and earthwork condition and select an optimal design route by simulating virtual placement of alternative route. This study configures systematic methodology for suggested VR simulation functions and develops VR system by the functions. Finally this study suggests an improved design process of road construction project by using the developed VR functions

• Journal of Radiation Protection and Research
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• 제19권2호
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• pp.99-107
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• 1994

This study aims to introduce a prescriptive methodology to comprehensively support the analysis of decision process by the use of Saaty's Analytical Hierarchy Process for the optimization of radiation protection. The analytical Hierarchy Process for the optimization of radiation protection. The analytical process for the problem of selecting options among given protection alternatives is illustrated with the data of the uranium mine example in ICRP Publ. 55. This technique, unlike other conventional selection method, is considered to provide a useful tool for the protection manager with respect to its ease of use and simplification in the choice of optimal alternative associated with radiological protection.

• Journal of Korean Society of Transportation
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• 제17권1호
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• pp.53-65
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• 1999

This paper attempts to find an improved organizational structure for operating the traffic safety facilities. Currently, police is in charge of the facilities while the local government is in charge of its budget. By doing so, many inefficiencies and problems occur in these things. A delphi technique is used to survey these inefficiencies. Problems, and improved role and organization by three expert groups in local government, police and university The survey results are analyzed by each expert group as well as by the total group. The multidimensional scaling technique is also used. The most preferable answer is to newly establish a traffic experts' agency under the local government. The second preferable answer is to set the current traffic police under the control of the local government.

• Proceedings of the Korea Water Resources Association Conference
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• 한국수자원학회 2015년도 학술발표회
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• pp.97-97
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• 2015

최근 몇 년간 발생한 도시홍수 피해의 주요 원인은 배수관망의 통수능 부족 때문이다. 2010년과 2011년에 연이어 발생한 서울시 침수피해의 주된 원인도 통수능 부족이라는 것을 관련된 보고서 등에서 확인할 수 있다. 따라서 현재 진행중이거나 계획중인 주요 침수지구의 '하수관거 종합정비 사업'은 주로 합류식 우수관거의 통수능 확보를 위한 사업으로 진행되고 있다. 하지만 침수지역의 관거 통수능 확보를 위한 관경확대는 관거확대 공사비용, 공사에 따르는 교통정체, 주거지역 시민의 피해, 제한된 공사비 등 여러 측면에서 제한될 수 있다. 배수망의 평면계획은 배수망의 유출반응과 밀접한 관련이 있다. 따라서 이 경우 관경확대 이외의 다른 대안으로 합류식 우수관거의 평면계획을 새로이 검토할 수 있다. 본 연구에서는 여덟 방향 깁스모형을 개발하여 기존의 네 방향 깁스모형과 비교하여 배수관망을 더욱 정확히 표현하도록 하였으며, 개발된 깁스모형을 활용하여 신월지구의 배수망 특성을 분석하였다. 또한 깁스모형을 이용하여 분석한 신월지구의 최적 배수관망 평면계획을 SWMM 모델에 적용하여 기존 배수관망 시스템과 최적 배수관망 시스템의 효율성을 검토하고 도시유역 적용성을 검토하였다. 따라서 본 연구의 결과는 깁스모형의 도시 배수망에의 적용성을 높임과 동시에 배수망의 평면계획을 이용하여 유출량 저감을 도모할 수 있는 새로운 대안을 제시할 수 있을 것으로 기대된다.

• Journal of Korean Society of Transportation
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• 제26권3호
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• pp.145-153
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• 2008

This study proposes a facility location model in consideration of spatial coverage and travel cost as an effort to make objective and effective decisions of natural gas filling stations. The proposed model is developed for fixed stations and consists of two stages. The first stage employs a heuristic algorithm to find a set of locations which satisfy the spatial coverage constraints determined by the maximum travel distance between the filling stations and bus depots. In the second stage, the optimal location of filling stations is determined based on the minimum travel cost estimated by using a modified transportation problem as well as the construction and maintenance costs of the filling stations. The applicability of the model is analyzed through finding the optimal location of filling stations for the city of Anyang, a typical medium-sized city in metropolitan Seoul, based on the demand of natural gas buses. This study is expected to help promote the spread of natural gas buses by providing a starting point of a objective and reasonable methodological perspective to address the filling station location problem.