• 한국방재학회:학술대회논문집
• /
• 한국방재학회 2008년도 정기총회 및 학술발표대회
• /
• pp.703-706
• /
• 2008

현재 유역종합치수계획의 구조적 홍수방어시설의 평가는 다차원홍수피해액 산정방법에 의해 수행되어지고 있으며, 건설교통부(2004)에서 제시한 경제성 분석과 안전 위험성, 지속 가능성을 고려하여 계층화분석(AHP)기법을 통하여 최적대안이 선정되고 있다. 그 결과 홍수방어시설의 정책성 분석의 결여로 인해 사회적 문제, 민원발생, 정부기관간의 마찰 등 많은 문제가 발생하고 있다. 본 연구에서는 이같은 문제를 해결하기 위해 유역종합 치수계획을 위한 계층화분석(AHP)기법의 정책성 평가의 계층구조를 재구성하고, 구조적 홍수방어시설의 최적대안 선정을 위해 정책적 세부 평가항목별 가중치를 설정하여 계층화분석(AHP)기법에 적용할 수 있는 정책적 평가기법을 개발하였다. 정책적 평가기법을 개발하기 위해서 치수사업의 정책성 평가 항목과 가중치 설정에 대해 전문가 설문조사를 실시하였다. 설문조사 결과와 한국개발연구원에서 제시한 국가 공공사업의 예비타당성 조사를 위한 가중치를 비교 분석하였다. 치수경제성에 높은 가중치를 부여하였던 과거와 달리 설문조사 결과는 치수경제성이 중요하지만 정책성 분석 역시 중요하다는 인식의 변화와 기본 평가항목을 추가하여 정책성 분석의 세부 평가항목의 다양성이 필요하다고 나타났다.

• 한국물환경학회지
• /
• 제34권6호
• /
• pp.591-601
• /
• 2018

Optimized BMP plans for controlling water quality using the Pareto trade-off surface curve in upper basin of Namgang Dam is proposed. The proposed alternatives consist of BMP installation scenarios in which the reduction efficiency of non-point pollutants is maximized in a given budget. The multi-objective optimization process for determining the optimal alternatives was performed without direct implementation of a watershed model such as SWAT analysis, thereby reducing the time taken. The shortening of the calculation time further enhances the applicability of the multi-objective optimization technique in preparing regional water quality management alternatives. In this study, different types of BMP are applied depending on the land use conditions. Fertilizer input control and vegetative filter strip are considered as alternatives to applying BMP to the field but only control of fertilizer input can be applied to rice paddies. Fertilizer input control and vegetative filter strip can be installed separately or simultaneously in a hydrologic response unit. Finally, 175 BMP application alternatives were developed for the water quality management of the upper river basin of Namgang dam. The proposed application alternative can be displayed on the map, which has the advantage of clearly defining the BMP installation location.

• 한국환경보건학회지
• /
• 제47권1호
• /
• pp.1-19
• /
• 2021

Objectives: Phthalates, which are widely used as plasticizers, have been recognized as endocrine disruptors. In the present study, we provided information on the regulation of these chemicals and summarized the information available on their detection and toxicity in children's products and those of their alternatives. Methods: The regulatory frameworks related to phthalates in children's products in Korea, the United States (US), and the European Union (EU) were compared. Data on the detection concentration of 16 phthalates and seven phthalate alternatives that could be used in polyvinyl chloride (PVC) plastic products for children as well as on their toxicity classification and endocrine disruption toxicity were collected from the literature. Results: Korea adopted US and EU chemical standards for six phthalates (DEHP, BBP, DBP, DINP, DIDP, and DNOP), but not others (e.g., DIBP, DPP, DHP, and DCHP). Among the ten phthalates and seven substitutes for which regulatory standards were not determined, DIBP, DHP, DEHA, DIBA, DINA, and DEHT were detected in children's products made from PVC plastic. DIBP and DHP, which have a reproductive toxicity classification of 1B, were frequently detected in PVC toys. The reproductive toxicity, estrogenicity, and anti-androgenic activity of the unregulated phthalates and their alternatives have been reported in diverse in vitro and in vivo assays. Conclusion: The use of unregulated phthalates and their substitutes in children's products is increasing. Further monitoring and toxicological information on phthalate alternatives is required to develop proper management plans.

• 분석과학
• /
• 제6권5호
• /
• pp.521-530
• /
• 1993

몬트리올의정서에 의하여 오존층 파괴물질로 규정된 전자산업의 필수불가결한 세정제인 CFC 113(1,1,2-trichloro 1,2,2,-trifluoroethane)의 사용이 앞으로 규제가 됨에 따라서 대체세정제의 개발이 활발히 진행되고 있다. 따라서 현재 시판중인 세정제의 종류는 상당히 많다. 이 중에서 Axarel 32(DuPont), Cleanthru 750H(KAO Chemical), EC-Ultra(Petroferm)를 선정하여 CFC 113과 세정성능을 비교하였다. CFC 113과 대체세정제의 세정성능 검사방법은 기본적은 물성측정, 재질호환성에 대한 실험, 증발속도의 측정, 오염물질의 제거효율에 관한 실험으로 구성되어 있다. CFC 113과 대체세정제들의 기본적인 물성들은 서로 상이하였다. 대체세정제는 비점이 높고 표면장력과 점도가 CFC 113보다 큰 값을 가지고 있다. 전자산업에서의 로진계 flux를 오염물질로 하고 각기의 세정제와의 용해도를 비교한 결과 비극성 유기물질은 abietic acid에 대한 용해도는 서로 유사하였으나 대체세정제의 경우 극성 유기물질에 대한 용해도는 CFC 113에 비해서 월등히 좋았다. 또한 비점이 낮은 CFC 113의 건조성은 대체세정제와는 비교할 수 없을 정도로 우수하였고 특히 대체세정제 중에서 EC-Ultra는 건조성이 매우 낮았다. CFC 113과 대체세정제에서의 PCB의 구성 재질인 FR4와 Cu-coated FR4에 대한 재질호환성은 거의 비슷하였다. Abietic acid의 제거효율에 관한 실험에서는 초음파 세정에 의해서 우수한 세정효과를 보여 주었으며 침적에 의해 세정에서는 건조성이 좋은 세정제가 유리하지만 초음파 세정에 의해서 대체세정제간의 제거효율의 차이는 거의 없었다. CFC 113의 대체세정제로서 로진계 flux를 제거하는 대체세정제간의 세정성능은 큰 차이는 없으나 최종 세정제로 선정하기 위해서는 세정장치의 적용, 환경문제 및 경제성의 고려가 병행되어야 한다.

• 한국실내디자인학회논문집
• /
• 제40호
• /
• pp.76-85
• /
• 2003

This study was intended to suggest the design alternatives of housing units which were developed on the basis of POE. The POE of the New Apartment Complex in Gimhae was carried out and on the basis of the results of this POE, the design alternatives of housing units were developed. The subjects were 372 housewives who live in the apartment houses sized 60m2 to 85m2 in Gimhae. They answered about the living characteristics related to house, the degree of saisfaction with their housing unit plans, and the needs for housing unit plan. The major problems in current housing unit were the lack of storage space and the small size of living room and children's bedrooms. Many residents wanted to live in the housing unit which have three bedrooms and some of them wanted two bedrooms. Also, they wanted to enlarge living room and instead of that, to reduce master bedroom. In addition to these, the residents had diverse housing needs. On the basis of these results, housing alternatives which are flexible and optionable were suggested.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
• /
• pp.477-483
• /
• 2011

Climate changes and environmental pollution problems are continuing every year. In Korea, the carbon dioxide(CO2) emissions by the transport sector reached around 20% of pollution. Many countries are enforcing the pollution-control policy. Korean government has introduced the modal shift grants as well as in other countries. In case of nation's transportation plan, the policy basis of green distribution is emphasized. However, the shipper and logistics company have low interests in the modal shift as the massive transportation system. The purpose of this paper is that I studied the policy alternatives for the modal shift of foreign railways., And also I studied the difficult problems at altering the railway freight from domestic road freight and I suggested the alternatives of modal shift to solve those problems.

• 대한산업공학회지
• /
• 제23권4호
• /
• pp.635-643
• /
• 1997

The purpose of this paper is to propose an interactive method, using fuzzy Choquet's integral, which is designed to find out the mostly preferred solutions for deterministic MADM problems with many attributes and alternatives. The basic idea of the paper is essentially the same as that of the one we have published before[1]; subgrouping of attributes and eliminating of inefficient solutions. But the difference between these two methods lies in the fact that the present method evaluates and eliminates alternatives using fuzzy Choquet's integral on the basis of decision-maker's judgements about the relative importance of subgroups of attributes, rather than using mathematical programming on the basis of pair-wise comparisons of alternatives. If such information is obtainable from the decision-maker, the method can be proved to be much easier to understand and more efficient to compute.

• 산업공학
• /
• 제13권1호
• /
• pp.100-109
• /
• 2000

This paper presents an economic analysis for alternatives of the building telecommunications cabling system to accommodate multimedia services. Four alternatives are developed with respect to capacities of the building telecommunications cabling systems. Economic analysis includes qualitative analysis as well as quantitative one and the results of those analyses are incorporated with AHP(analytic hierarchical process) method. In analyzing the alternatives, based on the possible growth of multimedia traffic and evolution of access networks, various scenarios are considered. The results suggest not only the most competitive alternative but also the conditions for each alternative to gain the competitive edge.

• 가정과삶의질연구
• /
• 제15권2호
• /
• pp.1-20
• /
• 1997

The aims of this study are as following. 1) To investgate information-search and evaluating alternatives of middle-aged wives in buying townwears as well as to examine socio-demographic variables physical varialbes and psychological variables and their influences on. 2) To compare the previous study (a study on problems recognition of mjiddle-aged wives in buying townwears) with this study and to relate this results ot previous study results. The data used in this study included 374 housewives living in Seoul and Pusan. Statistics used for data analysis were frequencies means standard deviation Pearson's correlation t-test Oneway ANOVA stepwise multiple regression analysis. major findings are as follows. 1. The degree of information-search and evaluating alternative proved more than middle point. 2. Variables that affect information-search and evaluating alternatives and three : attitude towards purchasing experience of menopause preference for expensive clothes.

• 품질경영학회지
• /
• 제21권2호
• /
• pp.179-193
• /
• 1993

Modifications of t he weighted Mack-Wolfe tests are proposed for both cases when the peak of umbrella is known and unknown. The modified weighted Mack-Wolfe tests are exactly distribution-free when the continuous populations have the same shape. For the case of peak-known umbrella alternatives, the modified weighted Mack-Wolfe tests remain asymptotically distribution-free when the continuous populations are symmetric, but not necessarily with the same shape. For the case of peak-unknown umbrella alternatives, the maximum of standardized modified weighted Mack-Wolfe tests with peak-known umbrella alternatives was used. The simulation results show that the modified weighted Mack-Wolfe tests are more recommended than the modified Mack-Wolfe tests for various patterns.