• Journal of Korea Water Resources Association
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• v.35 no.6
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• pp.703-714
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• 2002

During drought, there have been a number of conflicts because of the limited and insufficient water to allocate for the numerous water users. To solve the problems, the decision on the priority of water use should be made with social rationality A rational and systematic procedure needs to be implemented in order to decide the priority of water use. First, a criteria level is made of the main and detailed drought impacts which come from the economic, environmental, and social aspects. Four alternatives are then identified for priority of water use. Second, survey to the two group(professional, residents) has been done with using pair wise comparisons. Finally, the relative weights and the priority of alternatives are determined by means of the Analytic Hierarchy Process(AHP) which is one of the Multi-Attributed Decision Method(MADM). By using AHP, it has been concluded that the water allocation during drought should be accomplished in order of domestic, irrigation, industrial, and river maintenance water. If the AHP method were improved for inconsistency which may be generated with survey analysis, a number of applications will be used for the solutions of problem in water resources systems.

• Economic and Environmental Geology
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• v.38 no.1
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• pp.33-43
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• 2005

The purpose of this study is to make and validate landslide susceptibility map using artificial neural network and GIS in Kangneung area. For this, topography, soil, forest, geology and land cover data sets were constructed as a spatial database in GIS. From the database, slope, aspect, curvature, water system, topographic type, soil texture, soil material, soil drainage, soil effective thickness, wood type, wood age, wood diameter, forest density, lithology, land cover, and lineament were used as the landslide occurrence factors. The weight of the each factor was calculated, and applied to make landslide susceptibility maps using artificial neural network. Then the maps were validated using rate curve method which can predict qualitatively the landslide occurrence. The landslide susceptibility map can be used to reduce associated hazards, and to plan land use and construction as basic data.

• Journal of the Korean Institute of Traditional Landscape Architecture
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• v.31 no.4
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• pp.51-61
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• 2013

In order to answer the research question of 'how the listed World Cultural Heritage is being managed now?' the indicators of management effectiveness evaluation were set up based on international principles on the basis of the preceding research. The weights and priorities of each evaluation indicators were worked out through the Analytic Network Process(ANP) Technique. Therefore, the evaluation system to evaluate the management status of the World Heritage Sites have been established. Also, through calculate the converted score of 100 points based on the relative importance of these evaluation indicators among the World Heritage Site management effectiveness evaluation index for scoring and the score table was created. When evaluated for the management status of World Heritage Sites to set five rating of the final evaluation score: very deficiency, deficiency, general, good, excellent. According to the results the follow-up study will be carried out in the future.

• Korean Journal of Remote Sensing
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• v.18 no.2
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• pp.117-125
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• 2002

Multitemporal analysis with remotely sensed data is complicated by numerous intervening factors, including atmospheric attenuation and occurrence of clouds that obscure the relationship between ground and satellite observed spectral measurements. Using an adaptive reconstruction system, dynamic compositing approach was developed to recover missing/bad observations. The reconstruction method incorporates temporal variation in physical properties of targets and anisotropic spatial optical properties into image processing. The adaptive system performs the dynamic compositing by obtaining a composite image as a weighted sum of the observed value and the value predicted according to local temporal trend. The proposed system was applied to the sequence of NDVI images of AVHRR observed on the Korean Peninsula from 1999 year to 2000 year. The experiment shows that the reconstructed series can be used as an estimated series with complete data for the observations including bad/missing values. Additionally, the gradient image, which represents the amount of temporal change at the corresponding time, was generated by the proposed system. It shows more clearly temporal variation than the data image series.

• Journal of the Korea Convergence Society
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• v.10 no.11
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• pp.149-159
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• 2019

Six sigma is an innovative management movement which provides improved business process by adapting the paradigm and the trend of market and customers. Suitable selection of six sigma project could highly reduce the costs, improve the quality, and enhance the customer satisfaction. There are existing studies on the selection of Six Sigma projects, but few studies have been conducted to select the correct project under an incomplete information environment. The purpose of this study is to propose the application of integrated MCDM techniques for correct project selection under incomplete information. The project selection process of six sigma involves four steps as follows: 1) determination of project selection criteria 2) calculation of relative importance of team member's competencies 3) assessment with project preference scale 4) finalization of ranking the projects. This study proposes the combination methods by applying group fuzzy Analytical Hierarchy Process (AHP), an easy defuzzified number of Trapezoidal Fuzzy Number (TrFN) and Grey Relational Analysis (GRA). Both of the weight of project selection criteria and the relative importance of team member's competencies can be evaluated by group fuzzy AHP. Project preferences are assessed by easy defuzzified scale of TrFN in case of incomplete information.)

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.56-56
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• 2016

하도 안정성에 민감하게 반응하는 대표적 하천 구역은 본류와 지류의 합류부이다. 이와 같은 합류부에서는 흐름과 하상변동 양상이 상대적으로 복잡하다. 이는 본류 및 지류 간 유사이송량, 유황, 흐름, 하도경사 등 수리특성이 서로 다르기 때문이다. 지류 합류부에서는 지류 자체의 하상 변동 영향뿐만 아니라 본류의 하상변동으로부터도 직 간접적으로 영향을 받는다. 즉 본류에서 자연적이든 인위적이든 어떤 원인으로 말미암아 하상저하가 갑자기 일어나면 지류의 하도 종단경사 변화가 현저하게 일어나는, 이른 바 두부침식 현상이 발생하기도 한다. 한편 본류와 지천 사이 흐름특성 유사거동 특성이 서로 다르기 때문에 합류뷰 주위에 지속적인 국지퇴적이 야기되기도 한다. 합류부에서 이와 같은 침식 또는 퇴적 현상으로 말미암아 하천관리상 여러 문제점을 야기한다. 이에 따라 지류 합류부에서 하천경사를 일정하게 유지하기 위하여 하상유지공 설치 등 적절한 하도안정화 대책을 모색해야 한다. 따라서 본 연구에서는 기존의 하천정비기본계획에서 현안의 분석을 통해 개선 방안을 제시하였으며, 국가 및 지방 하천 3,836 개소에 대한 합류부 도상과 일부 현장 조사를 실시하였다. 조사?분석 결과를 바탕으로 합류부의 재해 유발 지표를 도출하고 전문가로부터 의견 수렴을 통해 가중치를 부가하여 합류부 재해 위험성 및 안정성 평가 기법을 정립하였다. 그 동안 관련 부처 및 지자체에서 하천계획을 수립하는 데, 중점 정비 및 관리가 필요로 하는 합류부를 선정 시 그 기준이 모호하였다. 그러나 본 연구에서 정량적으로 정립한 기준은 하천 합류부의 재해 위험성을 평가할 수 있어 고도의 하천관리를 지향할 수 있는 계기를 마련하였다.

• Journal of the Korea Convergence Society
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• v.10 no.5
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• pp.221-228
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• 2019

General education of university is facing the problem of failing to perform its original educational function compared to major education. The most urgent step in solving this problem lies in the evaluation of general education, which is currently designed and implemented by each university. Therefore, this study is aimed at developing the evaluation tool for university general education. This study determined the allotting of evaluation tools by verifying the relative importance among the evaluation index through the AHP analysis method, away form the simple list of the evaluation index, which is the limit of the precedent researches. The results of AHP showed that the organization of general education was the most important, while the latter was the implementation and evaluation of general education. The index determined to be the highest weighting of the total 22 indexes was "appropriateness of course organization" with "appropriateness of general education's purpose" being ranked second.

• Journal of the Korean GEO-environmental Society
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• v.12 no.1
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• pp.5-12
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• 2011

In this study, correlation between measured deformation modulus using pressuremeter and RMR value conducted in 10 sites is analyzed, and applicability of the conventional empirical formulas to the rock masses in Korea are analyzed, It is found that if RMR is below 40, the correlation between deformation modulus and RMR accords Kim Gyo-won's formula and Aydan, Serafim and Pereira's one well, but if the RMR exceeds 40, the correlation was lower than those from the formula. Such results may be attribute to the fact that during classification of RMR, scores are weighed relatively more in joint conditions and apertures than such highly correlational items as uniaxial compression strength or RQD, and RMR would not be evaluated qualitatively due to different weathering degrees and rock mass types as well as engineers' personal errors. Sandstone among sedimentary rocks are quite well accord with suggested equation, but correlation of other rocks are due to large variance. In this study, correlation expressions of various rocks are proposed as the function of exponential based on the field test data.

• Tunnel and Underground Space
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• v.31 no.4
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• pp.211-220
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• 2021

Tunnel collapse often occurs during deep underground tunneling (> 40 m depth) in South Korea. Natural cavities as well as water supply pipes, sewer pipes, electric power cables, artificial cavities created by subway construction are complexly distributed in the artificial ground in the shallow depths of the urban area. For deep tunnel excavation, it is necessary to understand the properties of the ground which is characterized by porous elements and various geological structures, and their influence on the stability of the ground. This study analyzed geological factors for risk assessment in deep excavation in South Korea based on domestic and overseas case study. As a result, a total of 7 categories and 38 factors were derived. Factors with high weights were fault and fault clay, differential stress, rock type, groundwater and mud inrush, uniaxial compressive strength, cross-sectional area of tunnel, overburden thickness, karst and valley terrain, fold, limestone alternation, fluctuation of groundwater table, tunnel depth, dyke, RQD, joint characteristics, anisotropy, rockburst and so forth.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.26 no.1
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• pp.162-169
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• 2022

In a dynamically changing time-varying network environment, the optimal moving pattern of edge devices can be applied to distributing computing resources to edge cloud servers or deploying new edge servers in the FEC(Fog/Edge Computing) environment. In addition, this can be used to build an environment capable of efficient computation offloading to alleviate latency problems, which are disadvantages of cloud computing. This paper proposes an algorithm to extract the optimal moving pattern by analyzing the moving path of multiple edge devices requiring application services in an arbitrary spatio-temporal environment based on frequency. A comparative experiment with A^* and Dijkstra algorithms shows that the proposed algorithm uses a relatively fast execution time and less memory, and extracts a more accurate optimal path. Furthermore, it was deduced from the comparison result with the A^* algorithm that applying weights (preference, congestion, etc.) simultaneously with frequency can increase path extraction accuracy.