• 상하수도학회지
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• 제35권2호
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• pp.121-133
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• 2021

This study set up the estimates of leakage management efficiency evaluation and leakage management goal that could be used in local water distribution networks efficiency business and modernization business. The data were analyzed using data envelopment analysis and multiple regression analysis. To this end, with leakage management input indices concerning leakage reduction activities (e.g., aged pipe replacement, water meter replacement, leakage restoration, and leakage detection) and leakage management calculation indices (e.g., the increase of revenue water ratio and the reduction of leakage ratio), the data on 22 K-water consignment local water supply systems were analyzed for the years from 2004 through 2018. Using the results of efficiency analysis by data envelopment analysis, the other DMUs (Decision Making Unit) benchmarked the DMU with the highest efficiency to maximize the leakage management efficiency for all DMUs. Through this, leakage management goal estimates were drawn with the input indices of four leakage reduction activities and calculation indices of the increase of revenue water ratio and the reduction of leakage ratio by multiple regression analysis for each group based on the revenue water ratio and leakage ratio. The correlation coefficients of the leakage management goal estimate for the criteria for the revenue water ratio amounted to 0.553 and 0.771. The correlation coefficients of the leakage management goal estimate for the criteria for leakage ratio were 0.397 and 0.865. Accordingly, we estimated the quantity and priority of four leakage reduction activities for the target leakage ratio and revenue water ratio.

• 한국식생활문화학회지
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• 제9권4호
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• pp.379-394
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• 1994

본 연구의 결과를 요약하면 다음과 같다. 1. 무공해식품의 구매동기로는 건강상의 이유(4.43/5점)가 가장 높았으며, 그 다음으로 영양가의 이유(4.01), 맛의 이유(3.39)의 순으로 나타나 무공해식품이 지닌 장점이 곧 소비자의 구매동기로 작용하고 있었다. 2. 첫번째의 무공해식품의 주정보원은 TV 라디오(65.1%)이었으며, 2위는 신문과 잡지(35.4%), 3위는 가족 친구 친지의 조언 상담(26.1%)으로 나타나 매스컴은 주요한 무공해식품의 정보원으로 활용되고 있었다. 3. 무공해식품의 구매시 전반적 고려정도(3.97/5점)가 상당히 높았고, 7가지 고려사항이 모두 높게 나타나 이 7가지 사항이 평가기준으로 활용되고 있었으며, 특히 위생상태와 신선도(4.37/5점), 영양가(4.13), 안전성(3.99)을 상당히 고려하는 것으로 나타났다. 또한 무공해식품의 의견선도자는 매스컴(53.5%)이었으며, 구매시 자녀(50.6%)와 남편(34.3%)을 고려하여 구매하는 경향이었다. 4. 첫번째로 이용하는 구매장소는 슈퍼마켓(67.9%)이었으며 두번째의 장소로는 백화점(42.1%), 세번째로는 시장(35.5%) 및 인근가게(27.0%)로 나타났다. 또한 구매시 전반적 확인정도는 높았으며, 확인사항으로는 유통 보존기한(4.63)과 제조일자(4.59), 포장의 손상여부(4.47)는 반드시 확인하고 구입하는 경향이었으나, 제조회사명(3.83)을 확인하는 경우가 다소 낮았으며, 환경마크 및 품질보증표(3.91)와 식품첨가물(3.96)도 확인하는 경향이 높았다. 5. 구매 후 전반적 불만족도는 그다지 높지는 않았으나, 가격(4.03), 제품함량 부족(3.61), 성분과 제조날짜의 표시 미기재 및 불명확(3.45, 3.23)에 대해서 다소불만족한 것으로 나타났다. 6. 무공해식품의 전반적 고려정도와 확인정도에 영향력을 미치는 가장 큰 변수는 무공해식품에 대한 관심도이었으며 그 다음으로는 주택유형이었다. 또한 전반적 불만족도에 가장 큰 영향 변수로는 소득으로 나타났으며, 그 다음으로도 주택유형으로 나타났다. 즉 무공해식품의 관심도가 많고 아파트에 거주하는 집단에서 무공해식품의 구매시 고려정도와 확인정도가 높으며, 소득이 많고 아파트에 거주하는 집단에서 무공해식품에 대한 전반적 불만족도가 높았다.

• 대한산업공학회지
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• 제40권6호
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• pp.628-641
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• 2014

Stepwise efficiency improvement in data envelopment analysis (DEA)-based benchmarking is a realistic and effective method by which inefficient decision making units (DMUs) can choose benchmarks in a stepwise manner and, thereby, effect gradual performance improvement. Most of the previous research relevant to stepwise efficiency improvement has focused primarily on how to stratify DMUs into multiple layers and how to select immediate benchmark targets in leading levels for lagging-level DMUs. It can be said that the sequence of benchmark targets was constructed in a myopic way, which can limit its effectiveness. To address this issue, this paper proposes an optimization approach to the construction of a sequence of benchmarks in DEA-based benchmarking, wherein two optimization criteria are employed : similarity of input-output use patterns, and proximity of input-output use levels between DMUs. To illustrate the proposed method, we applied it to the benchmarking of 23 national universities in South Korea.

• 한국정보시스템학회지:정보시스템연구
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• 제14권1호
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• pp.19-40
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• 2005

The history of computer virus comes along with that of computer. Computer virus han surfaced as a serious problem in information age. The advent of open network and widespread use of Internet made the problem even more urgent. As a method of defense for computer virus most companies use anti-virus software. Selecting appropriate anti-virus software involves various criteria and thus it is a multiple-attribute decision making problem. The purpose of this study is to prioritize anti-virus software evaluation factors. To do that, first of all, important evaluation factors are selected based on previous research on anti-virus software as well as general software evaluation models. Then, a questionnaire survey was conducted on end-users, system administrators and anti-virus software developers. The survey result was analyzed with ExpertChoice 2000 which is based on Analytic hierarchy Process technique. This study found that there are clear differences among three survey groups regarding the relative importance of overall evaluation factors. End-user group ranked "cost" first, but it was the least important factor to developer group. Developers pointed out "operational support" ad the most important factor. There were also obvious differences in the relative importance of detail evaluation items. Both end-users and system administrators shared 7 common items among top 10 most important items. Moreover, neither of the two groups ranked any of the items in the "operational support" factor in top 10, whereas all 4 items in the factor were included in top 10 by developer group.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2001년도 학술논문발표회
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• pp.99-117
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• 2001

In the past, The selection of individual method of construction was done by head of construction site or an experienced person very frequently. By doing this, The wrong selection of construction method without exact adjudication of construction site situation lead to increasing of cost and extension of construction term. Finally it will effect all over the construction process. Especially, In case of Underground construction in the beginning, there are a lot of a variable factor and it also effect on the entire construction process and it need rely careful process. The purpose of this study is to present the best suitable methodology fer selection of construction method by considering potential risk of construction method and variables together with external condition for Underground construction. The purpose of this study is to select the most suitable construction method by analysing potential conditions(Construction site situation and Client. Request in designing) To do this, We prepared arrangement rule to arrangement conditions for construction method. And then make Checklist the analyzing construction method. Though above process, To expect the risk of individual construction method using above risk checklist and using Analytic Hierarchy Process among Multiple-Criteria Decision Making, the professional opinions is to be adapted. By doing this, It can lead and select the most suitable considering method considering the data which get from risk density test.

• The Journal of Asian Finance, Economics and Business
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• 제8권1호
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• pp.419-430
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• 2021

The study aims to analyze the factors that shape patient loyalty, namely, by involving the service quality factor (SERVQUAL), hospital image, patient value, and patient satisfaction in private hospitals. This study was conducted in Makassar City, Indonesia, with a sample of 296 eligible samples from private hospitals. The sample criteria were patients with outpatient and hospitalization status. Then, this study developed 23 hypotheses to test the statistical relationship between direct, intervening and multiple-effect models. Problem-solving and research focus are carried out using a quantitative method approach with a PLS-SEM-based testing tool. The bootstrapping method is being used with the constant bootstrapping step to demonstrate the results of hypothesis testing; we find that the overall hypothesis has a positive and significant effect. The combination of testing models involving several variables shows that a patient's loyalty can be formed if a patient's satisfaction has been realized. Satisfaction can be realized if the value-customer has been felt by the patients. Therefore, the hospital image must be directly proportional to service quality. Service quality is the essence of service that directly affects customers; service quality is also the reason that shapes consumer perceptions in increasing rationalization and solid customer (patient's) decision-making.

• Advances in Computational Design
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• 제8권4호
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• pp.327-351
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• 2023

This article explores how multi-objective optimization techniques can be used to design cost-effective and structurally optimal spatial steel structures, highlighting that optimizing performance can be as important as minimizing costs in real-world engineering problems. The study includes the minimization of maximum horizontal displacement, the maximization of the first natural frequency of vibration, the maximization of the critical load factor concerning the first global buckling mode of the structure, and weight minimization as the objectives. Additionally, it outlines a systematic approach to selecting the best design by employing four different evolutionary algorithms based on differential evolution and a multi-criteria decision-making methodology. The paper's contribution lies in its comprehensive consideration of multiple conflicting objectives and its novel approach to simultaneous consideration of bracing system, column orientation, and commercial profiles as design variables.

• 한국지반환경공학회 논문집
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• 제21권10호
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• pp.11-16
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• 2020

우리나라의 농업용 저수지는 국가 주요 기반시설 중 하나로 국민의 삶에 중요한 역할을 수행하고 있다. 하지만 노후화된 저수지가 인명과 재산에 대한 위험 요소로 작용하고 있는 실정이다. 현재 전국에 40년이 넘은 노후화가 진행된 크고 작은 댐과 저수지가 건설되어 있다. 전국에 건설된 댐, 저수지의 관리주체는 여러 기관으로 나눠져 있다. 따라서 비용과 시간적 문제로 모든 댐, 저수지의 관리가 어려운 실정이다. 그렇기 때문에 적은 관리 인력과 전문지식이 부족한 현장의 관리자도 다수의 저수지에 대하여 위험요인을 신속히 파악하고 시설물을 상태를 파악할 수 있는 소규모 저수지에 최적화된 안정성 평가 시스템이 구축되어야 한다. 본 연구에서는 위험인자로 침투, 누수, 침하, 활동, 균열, 침식으로 항목들을 선정하였으며 항목들의 위험도를 평가하기 위해 다기준 의사결정(Multi-Criteria Decision Making : MCDM) 방법 중 하나인 계층적 분석 과정(AHP) 기법을 활용하였다. 분석 결과 침투, 누수, 균열, 활동, 침하, 침식 순으로 나타났다. 산정된 가중치를 활용하여 사전에 간편한 방법으로 댐 저수지 붕괴 위험도를 평가하여 정밀진단 우선순위를 결정 할 수 있을 것으로 판단된다.

• Journal of Forest and Environmental Science
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• 제34권6호
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• pp.461-471
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• 2018

In this study, the deforestation and forest degradation areas have been obtained in Myanmar using a land cover lamp (LCM) and a tree cover map (TCM) to get the $CO_2$ potential reduction and the strength of occurrence was evaluated by using the geostatistical technique. By applying a multiple criteria decision-making method to the regions having high strength of occurrence for the $CO_2$ potential reduction for the deforestation and forest degradation areas, the priority was selected for candidate lands for REDD+ project. The areas of deforestation and forest degradation were 609,690ha and 43,515ha each from 2010 to 2015. By township, Mong Kung had the highest among the area of deforestation with 3,069ha while Thlangtlang had the highest in the area of forest degradation with 9,213 ha. The number of $CO_2$ potential reduction hotspot areas among the deforestation areas was 15, taking up the $CO_2$ potential reduction of 192,000 ton in average, which is 6 times higher than that of all target areas. Especially, the township of Hsipaw inside the Shan region had a $CO_2$ potential reduction of about 772,000 tons, the largest reduction potential among the hotpot areas. There were many $CO_2$ potential reduction hot spot areas among the forest degradation area in the eastern part of the target region and has the $CO_2$ potential reduction of 1,164,000 tons, which was 27 times higher than that of the total area. AHP importance analysis showed that the topographic characteristic was 0.41 (0.40 for height from surface, 0.29 for the slope and 0.31 for the distance from water area) while the geographical characteristic was 0.59 (0.56 for the distance from road, 0.56 for the distance from settlement area and 0.19 for the distance from Capital). Yawunghwe, Kalaw, and Hsi Hseng were selected as the preferred locations for the REDD+ candidate region for the deforestation area while Einme, Tiddim, and Falam were selected as the preferred locations for the forest degradation area.

• 한국컴퓨터정보학회논문지
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• 제13권7호
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• pp.239-246
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• 2008

본 연구에서는 기업의 운영과 재정, 경쟁력 등에 영향을 비치는 전략적으로 중요한 의사결정인 공급업체 선정을 위한 수리적 평가모형을 제시하고자 하였다. 우수한 공급업체 평가 및 선정을 위한 의사결정을 위해서는 서로 상충되는 다양한 양적요인과 질적요인에 대한 고려가 필요하다. 기존의 연구들이 제시한 단일목적 혹은 다수 목적의 최적화를 추구하는 수리적 모형들 대부분은 공급업체 선정과정예서 매우 중요한 역할을 담당하는 질직 요인을 반영치 않았거나, 모형의 유연성이 제한적 이어 광범위한 활용이 힘든 실정이다. 이에 본 연구에서는 공급업체 평가 및 선정을 위해 양적요인뿐만 아니라 질적요인을 동시에 고려한 최선의 공급업체 선정과 주문량 결정을 위한 AHP기법과 선형계획모형을 결합한 통합모형을 제시하였다. 본 통합모형은 공급업체 선정을 위한 평가요인과 이들의 상대적 중요도를 기업의 경영상황에 따라 선택 조정할 수 있으며, 제약조건에 대한 추가나 수정에 유연성을 부여함으로써 기업의 공급업체 평가 및 선정을 위한 실제적인 활용 가능성을 제고시키고자 하였다