• Title/Summary/Keyword: 효용

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Development of MCDM for the Selection of Preferable Alternative and Determination of Investment Priority in Water Resource Projects (수자원사업 대안선정 및 투자우선순위결정을 위한 다기준의사결정모형 개발)

  • Yeo, Kyudong;Kim, Gilho;Lee, Sangwon;Choi, Seungan
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.31 no.6B
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    • pp.551-563
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    • 2011

  • Water resource projects need an enormous national budget. Therefore, a reasonable and reliable decision making is required for the planning of water resource projects, but decision making has been mostly performed by economic analysis. The objective of this study is to develop a Multi-criteria Decision Making(MCDM) model which can assess the project in various aspects for the selection of preferable alternative and determination of investment priority in water resource projects. In this study, the criteria involves economic feasibility, policies, vulnerability, and sub-items which have weights obtained from the expert survey for the consistent evaluation. We also derived the utility function considering risk trend of each item based on the expert survey. Then, the total score was estimated by weights of each item and utility score of each attribute. The results show that vulnerability is a major contributor for the criteria. This study will contribute to the selection of proper water resource projects considering efficiency of project and fairness for vulnerable area.

  • https://doi.org/10.12652/Ksce.2011.31.6B.551 인용 PDF KSCI

Development of 3th Effects Evaporative desalination system for Solar Desalination System (태양에너지 해수담수화를 위한 3중 효용 증발식 담수기 개발)

  • Hwang, In-Seon;Joo, Hong-Jin;Yun, Eung-Sang;Kwak, Hee-Youl
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.06a
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    • pp.201-201
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    • 2010

  • The evaporative desalination system with solar energy would be the efficient and attractive method to get fresh water. This study was described the development of Multi Effect Distillation(MED) with solar energy desalination system. The system was designed and manufactured Multi effect distillation on the capacity of $3m^3$/day. The experimental apparatus consists mainly of ejector pump, Hot water pump, flow meter, demister, cooler, evaporator and condenser. Evaporator and condenser were made Shell&Tube Heat Exchanger type with corrugated tube. The experimental variables were chosen $75^{\circ}C$ for hot water inlet temperature, 40, 60 and $80{\ell}$/min for hot water inlet volume flow rate, 6.0 and $8.0{\ell}$/min for evaporator feed seawater flow rate, $18^{\circ}C$ for sea water inlet temperature to cover the average sea water temperature and the salinity of sea water is measured about 33,000 PPM (parts per million). for a year in Korea. This study was analyzed the results of thermal performance of Multi Effect Distillation. The results are as follows, The experimental Multi effect distillation is required about 40 kW heat source for production of $3m^3$/day fresh water. Various operating flow rate was confirm in the experiments to get the optimum design data and the results showed that the optimum total flow was $8.0{\ell}$/min. Comparison of Single Effect Distillation with Multi Effect Distillation showed MED is at least more than double of SED.

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Colluders Tracing on the Collusion Codes of Multimedia Fingerprinting Codes based on BIBD (BIBD 기반의 멀티미디어 핑거프린팅 코드의 공모코드들에 대한 공모자 추적)

  • Rhee, Kang-Hyeon
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.46 no.6
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    • pp.79-86
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    • 2009

  • In this paper, it has the performance metrics and the utility evaluation of the collusion codes about multimedia fingerprinting code based on BIBD and then the tracing algorithm of all colluders is proposed. Among the collusion codes, the bit stream of "all 0" or "all 1" are generated, also same collusion code and bit reversed code with user's fingerprinting code are generated. Thus there was occurred some problems, in which a colluder is deciding to anti-colluder or anti-colluder is deciding to colluder. In this paper, for the performance metrics and the utility evaluation of the collude codes, the experiment onto the total solution is processed by the logical collusion operation added with a partially processed averaging attack in the past papers. The proposed performance metrics and the utility evaluation about the collusion code generated from multimedia fingerprinting code based on BIBD is operated. Through the experiment, it confirmed that the ratio of colluder tracing is 100%.

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