• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.1352-1356
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• 2006

우리나라에서 물과 관련된 분쟁은 민주화와 지방분권화가 가속화됨에 따라 갈등의 주체뿐만 아니라 전개양상까지도 다양하게 변화되고 있다. 최근에는 이 같은 갈등구조가 심화되고, 다양한 형태로 표출됨에 따라 사회불안요인으로까지 확대되고 있어 합리적이고 효율적인 분쟁해결을 지원하기 위한 방법론이 필요한 실정이다. 본 연구에서는 대안적 분쟁해결(ADR, Alternative Dispute Resolution)의 기법 중 하나인 조정(mediation)과정에서의 조정안 도출을 위해 게임이론을 적용하였다. 게임이론에 의한 합리적 해는 제시된 조정안에 객관성을 부여함으로써 의사결정과정의 신뢰성을 향상시킬 것으로 기대된다. 본 연구를 통해 제시한 방법론을 지역 간물 배분과 관련한 가상의 분쟁상황에 적용하였으며, 동적완비정보게임(dynamic complete information game)에서의 교섭게임(bargaining game)으로 구성한 뒤, 경기자(players) 간 배분비율과 배분량을 도출하였고, 이를 편익함수에 의한 양 경기자의 부족편익과 초과편익을 비교하여 그만큼의 편익 차를 보상해주는 조정을 모색하였다. 본 연구는 제3자(third party)에 의한 조정안 제안 시 객관적이고 합리적인 해를 제공하여 이해당사자들이 합의를 이끌어 내는 데 크게 기여할 수 있을 것으로 사료된다.

• Journal of Korea Water Resources Association
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• v.37 no.8
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• pp.663-674
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• 2004

In this study, the principle of water allocation is proposed based on efficiency, equity, sustainability. Also weighting factors are estimated with sectoral factors and regional factors. The former represents relative weights among water use and the latter represents physical characteristics of water demand places. The AHP(Analytic Hierarchy Process) is applied to estimate the sectoral factors, and compounded regional-characteristic factors and regional-scale factors, which reflects socioeconomic statistics for the regional factors. By applying these weighting factors, water allocation rules for dam is developed and applied to Andong dam which supplies water to parts of Busan Shi, Daegu Shi and Goryeong Gun in a water-deficit situation. As a result, it is estimated that Water allocation by priorities distributes the entire water shortage to the lowest rank of water sectors or regions, while water allocation by relative weighting factors disperse all the burdens of water shortage to all sectors and regions.

• Korean Journal of Agricultural Science
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• v.12 no.2
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• pp.333-340
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• 1985

In this paper, we discuss the role of allocative efficiency and X-efficiency in determining resource allocation under the share tenency. Economic efficiency of resource allocation is related to land reform. Classical and neoclassical schools insist that land reform must be achieved for agricultural development by more efficient use of inputs. According to them, there is no incentive for tenants to use inputs until $MVP{\ell}=wage$ under the share tenancy. But "equal efficiency" school's conclusions are different. They conclude that there is no productivity differences between owner cultivation and share tenancy, owing to monopoly power of landlords and/or landlords's transaction costs. Considering X-efficiency, the share tenancy is not as efficient as the owner cultivation. On the other hand, the productivity differences may be reverse, in which landlords cultivate their lands by wage contracts. Land reform--reduction of land rent or redistribution of land--will be benefitable not only for agricultural development, but also for resource allocation in farm management.

• Journal of Environmental Impact Assessment
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• v.26 no.1
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• pp.44-56
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• 2017

Sustainable development is important because the ultimate objective is efficient development combining the economic, social, and environmental aspects of urban conservation. Despite Korea's rapid urbanization and economic development, the distribution of resources is inefficient, and land-use is not an exception. Land use distribution is difficult, as it requires considering a variety of purposes, whose solutions lie in a multipurpose optimization process. In this study, Yangpyeong-eup, Yangpyeong, Gyeonggi-do, is selected, as the site has ecological balance, is well-preserved, and has the potential to support population increases. Further, we have used the genetic algorithm method, as it helps to evolve solutions for complex spatial problems such as planning and distribution of land use. This study applies change to the way of mutation. With four goals and restrictions of area, spatial objectives, minimizing land use conversion, ecological conservation, maximizing economic profit, restricting area to a specific land use, and setting a fixed area, we developed an optimal planning map. No urban areas at the site needed preservation and the high urban area growth rate coincided with the optimization of purpose and maximization of economic profit. When the minimum point of the fitness score is the convergence point, we found optimization occurred approximately at 1500 generations. The results of this study can support planning at Yangpyeong-eup.ausative relationship between the perception of improving odor regulation and odor acceptance.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.36 no.3
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• pp.551-564
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• 2016

Earthworks are the fundamental steps in a construction job, and are mainly comprised of smaller tasks performed by construction machinery. The productivity of the construction job can be improved by optimizing excavation, filling, and other such operations. Earthworks involve a lot of mechanical work performed by the collaboration between various kinds of construction equipment, which in turn leads to higher fuel consumption. Actual earthworks depend mostly on the intuition and experience of the driver of the machines, thus leading to inefficiency and environmental problems caused by unnecessary emission of carbon, Recently automated and information-oriented technologies are consistently being researched towards the improvement of efficiency of earthworks in the construction industry. The present research involves the introduction and understanding of the decision-making elements of heuristics which can be applied to the earthwork planning. A method is also suggested for creating an effective work path for construction machine to perform task packages (TP) for cutting and filling processes. A simulation test is performed to verify the effectiveness of suggested methods in terms of space interference and total moving distance of construction equipment.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.255-255
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• 2022

안정적이고 효율적인 물 배분과 관리를 위해 하천유량 외에도 하천수 사용량 파악에 대한 관심이 높아짐에 따라 다양한 하천수 사용량 계측방법의 검증 및 표준화로 하천수 사용량 자료의 신뢰도 및 활용성을 개선할 필요가 있다. 다양한 계측방법 중에서도 전자파표면유속계는 비접촉식 유속계이므로 안전적인 측면으로 유리하고 실시간 자료처리 및 계측이 용이하여 활용도가 높다. 본 연구에서는 만경강의 하천수 사용량 파악을 위해 어우보 취수로에 설치된 전자파 표면유속계(RQ-30)를 활용하여 보정계수(K-factor)가 적용된 표면유속을 활용한 유량산정방법, 표면유속과 평균유속의 일정비율로 유량을 산정하는 방법(ISO 748), Chiu의 유속분포법을 활용한 유량산정방법, 지표유속과 인력(人力)에 의한 측정유속과의 관계인 지표유속-평균유속관계곡선식으로 환산된 유량산정 방법등을 비교·검토하고 최적의 유량산정방법을 제시하였다. 향후 전자파표면유속계를 활용한 하천수 사용량의 비교결과를 통하여 더욱 효율적이며 신뢰도 높은 하천수 관리와 실시간 물배분 효과를 기대할 수 있다.

• The Korean Journal of Applied Statistics
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• v.8 no.1
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• pp.27-38
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• 1995

In the surveys of sensitive issues of the population that is composed of several unknown-size stratum, we propose the unrelated question model with quantitative attribute by using stratified double sampling. And, we consider two types of sample allocations under the fixed cost, which are the proportional allocation, the optimum allocation. In efficiency, the proosed model is inferior to the unrelated question model with quantitative attribute by stratified sampling in case of the size of each stratum is known. But we find that efficiency of the proposed model is increased, when the selecting probability of sensitive question p is small and first stage sample size n' is large.

• Journal of Korean Society of Transportation
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• v.21 no.4
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• pp.113-132
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• 2003

Using nonradial data envelopment analysis(DEA) under assumptions of strong disposability and variable returns scale, this paper annually estimates productive. technical and allocative efficiencies of three publicly-owned rail transit properties which are different in terms of organizational type: Seoul Subway Corporation(SSC, local public corporation), the Seoul Metropolitan Electrified Railways sector (SMESRS) of Korea National Railroad(the national railway operator controlled by the Ministry of Construction and Transportation(MOCT)), and Busan Urban Transit Authority (BUTA, the national authority controlled by MOCT). Using the estimation results of Tobit regression analysis. the paper next computes their true productive, true technical and true allocative efficiencies, which reflect only the impacts of internal factors such as production activity by removing the impacts of external factors such as an organizational type and a track utilization rate. And the paper also computes an organizational efficiency and annually gross efficiencies for each property. The paper then conceptualized that the property produces a single output(car-kilometers) using four inputs(labor, electricity, car & maintenance and track) and uses unbalanced panel data consisted of annual observations on SSC, SMESRS and BUTA. The results obtained from DEA show that, on an average, SSC is the most efficient property on the productive and allocative sides, while SMESRS is the most technically-efficient one. On the other hand. BUTA is the most efficient one on the truly-productive and allocative sides, while SMESRS on the truly-technical side. Another important result is that the differences in true efficiency estimates among the three properties are considerably smaller than those in efficiency estimates. Besides. the most cost-efficient organizational type appears to be a local public corporation represented by SSC, which is also the most grossly-efficient property. These results suggest that a measure to sort out the impacts of external factors on the efficiency of rail transit properties is required to assess fairly it, and that a measure to restructure (establish) an existing(a new) rail transit property into a local public corporation(or authority) is required to improve its cost efficiency.

• Proceedings of the Korea Water Resources Association Conference
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• 2020.06a
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• pp.129-129
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• 2020

전국적으로 약 18,000여개가 축조되어 있는 농업용 저수지는 국내농업용수 사용량 중 약 60%를 공급하는 핵심 농업기반시설로서 홍수기에 풍부한 수량을 저류한 후 관개기 혹은 갈수기에 주로 논벼 재배지역에 용수를 공급한다. 최근에는 가뭄에 의한 피해 심각성이 증가함에 따라 농업용 수확보대책 수립, 저수지 준설, 관정개발, 양수저류 등의 다양한 대응 방안을 마련하여 농업가뭄 극복을 위해 노력하고 있으나, 농업용수공급은 현장 물관리자의 경험을 토대로 공급되고 있어 공급량 관리가 정성적이고 제한적인 한계가 발생한다. 따라서, 농업용수의 효율적인 물 관리, 수원공으로부터 물공급의 합리적인 분배, 말단 수로 및 포장까지 안정적인 용수공급을 위한 물공급 및 분배 효율 분석이 필요하다. 본 연구에서는 서산지역의 신송저수지를 대상으로 2019년 5월부터 8월까지 통수일지 자료를 활용하여 농업용수 물공급 및 분배 모의, 관개효율을 분석하였다. 이를 위하여 부정류해석이 가능한 SWMM (Storm Water Management Model) 모형을 기반으로관개지구 용수공급 체계 네트워크와 들녘별로 용수공급이 가능하도록 구축하였고, 해당 지구의 실제 통수 시 수위 유량 계측을 통해 모델의 필수 변수 입력자료를 구축하였다. 전체면적 대비 수혜면적 비율과 전체 관개량 대비 해당 간선의 관개량 비율의 비교를 통해 수혜면적에 따른 관개효율을 분석하였으며, 각 수로별 공급량 대비 관개량 비율을 산정하여 수로별 관개효율을 분석하였다. 농업용수공급 효율 평가 결과는 수혜면적의 용수부족지역 파악, 시기별 용수배분의 공간적인 분포 모니터링 등 농업용수 이수대책에 활용하여 농업가뭄 상황 시 효율적인 물 배분 및 관리에 활용될 수 있을 것으로 판단된다.

• Journal of Korean Society of Transportation
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• v.22 no.7 s.78
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• pp.147-154
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• 2004

The purpose of this paper is to improve the existing phase split algorithm considering the minimum green time in COSMOS. In the case of a signalized intersection where two wide and narrow streets intersect each other, the time required for the pedestrian crossing is frequently longer than the time alloted to the through traffic on a minor street. In order to meet the minimum green time requirement for the pedestrian less time in alloted automatically to the left-turn traffic, creating heavy congestion on the left-turn approach. To solve this problem, this study suggests a new algorithm which shares the barrier using minimum green time and shares the burden with signal phases alloted to the crossing street traffic on the basis of the equal ratio of the degree of saturation, while maintaining the minimum green time requirement. The new algorithm was compared with the existing algorithm by using a microscopic simulation model for COSMOS evaluation developed at Ajou University. The simulation results show that the new algorithm produces better performance than the existing one.