선택적 부족분 공급방식에 따른 댐 하류하천의 유황 변화 분석

최영제,박문형 한국수자원학회 2022 한국수자원학회논문집 Vol.55 No.12

Currently, South Korea implements water resources management policies focusing on integrated water quantity, quality and hydro-ecology management. In particular, rehabilitation of natural rivers has become a major issue. As for reservoir operation during non-flood season, efforts have been made continuously to apply the Deficit Supply Method that can maximize water supply to address droughts and increase in water demand. When Deficit Supply Method is applied, the water supply capacity of reservoir can be maximized. However, downstream water flow would remain constant. In consideration that a natural stream, a long-time-created hydro-ecology, can be significantly influenced by flow variability, the Deficit Supply Method-based reservoir operation can generate effective water supply. Still, it may trigger adverse effects from the aspects of natural rehabilitation and hydro-ecology recovery. The main objective of this study is to analyze impacts on downstream flow duration through reservoir simulation by comparing the Firm Supply Method, the Deficit Supply Method and the Selective Deficit Supply Method, and examining each method’s effects on reservoir operation. This study found that the Firm Supply Method could maintain water flow variability, but could not maximize water supply capacity. When the Deficit Supply Method was applied, water supply capacity could be increased while remaining vulnerable regarding water flow variability, as a difference between average flow and low flow was negligible at downstream. In comparison, the Selective Deficit Supply Method was found to sustain time-based reliability at 95% or higher, whereas downstream flow duration could be maintained at a level similar to the level generated by the Firm Supply Method. 최근 우리나라의 물 관련 정책은 수량-수질-수생태 통합관리 방향으로 진행되고 있으며, 특히 하천의 자연성 회복이 주요한 이슈가 되고 있다. 이수기 댐 운영에 있어서는 가뭄, 물 수요 증가 등으로 용수공급 효과를 극대화시킬 수 있는 부족분 공급방식을 적용하고자하는 시도들이 이어지고 있다. 댐 운영에 부족분 공급방식을 적용하면 댐의 용수공급능력을 극대화 시킬 수는 있지만 하류 하천의 유량이 일정하게 유지된다는 특징이 있다. 자연하천은 오랜 시간동안 형성된 하나의 생태계로 유량의 변동성에 큰 영향을 받는다. 결국 부족분 공급방식을 적용한 댐 운영은 수량 관리에서는 효과적이지만 하천의 자연성 회복 및 수생태 측면에서는 부정적 영향을 미칠 수있다. 본 연구에서는 저수지 모의를 통해 보장량 공급방식, 부족분 공급방식, 선택적 부족분 공급방식 등의 댐 운영이 하류 하천 유황에 미치는 영향을 분석하고, 각 운영방식의 적용 효과에 대해 분석하고자 하였다. 그 결과 보장량 공급방식을 적용하면 하천의 유량 변동성은 크게 유지할 수 있으나 댐의 용수공급능력은 크지 않은 것으로 나타났다. 부족분 공급방식을 활용하면 용수공급능력을 증대시킬 수는 있으나 하류의 평수량과 갈수량의 차이가 매우 작아 유량의 변동성 측면에서는 매우 취약한 것으로 확인되었다. 선택적 부족분 공급방식을 적용할 경우 기간신뢰도를 95% 이상으로 유지하며, 하류 하천의 유황은 보장량 공급방식을 적용할 때와 유사하게 유지할 수 있는 것으로 분석되었다.

Study on the Evaluation of Agricultural Supply Chain Finance Model: Focused on Jilin Province China

Zhi-Run Li(이지윤),Wen Ju(극문),Sung-Chan Kim(김성찬),Shi-Yong Piao(박세영),Shuang-Yu Hu(호쌍우),Jong-In Lee(이종인) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.8

수십 년의 개발 끝에 중국의 농업 공급망 금융(ASCF) 모델은 뚜렷한 특징을 가지고 있다. 본 논문에서는 주로 농업 공급망 금융(ASCF)의 형성과 발전 메커니즘, 다양한 형태의 농업 공급망 금융(ASCF), 농업 공급망 금융(ASCF)의 평가 방법을 소개한다. 본 논문은 중국 지린성의 데이터를 사용하며 그레이 상관 분석(Gray Correlation Analysis) 및 엔트로피 법칙(entropy method)으로 표본을 평가한다. 이런 분석결과를 바탕으로 이 연구는 농업 공급망 금융(ASCF)이 농촌 경제 발전에 미치는 영향을 파악한다. 그레이 상관 분석법(Grey Correlation Analysis)을 이용하면 농촌경제개발구조의 지표가 0.7998로 농촌경제발전에 대한 상관관계가 가장 높은 것으로 나타났다. 엔트로피 법칙(entropy method)을 활용해 금융발전 규모 지수가 0.78로 농촌경제발전에 가장 큰 영향을 미치는 것으로 나타났다. 결과적으로 농업 공급망 금융(ASCF)이 농촌 경제 발전에 긍정적인 영향을 미치며, 농업 핵심 기업이 가장 중요한 역할을 하고 있다. 따라서, 본 논문은 농촌 금융의 발전을 위한 몇 가지 새로운 방법을 제공한다. 농업 공급망 금융(ASCF)이 농촌경제 개선에 상당한 영향을 미치고 있음을 시사하며, 농업 공급망 금융(ASCF) 발전의 초점, 즉 농업 핵심 기업이 중요한 역할을 하고 있음을 시사한다. After many decades of development, China"s agricultural supply chain finance model has distinct characteristics. This article mainly introduces the formation and development mechanism of an agricultural supply chain finance, different types of agricultural supply chain finance, and evaluation methods of agricultural supply chain finance. This paper uses the data from Jilin Province, China, and evaluates the samples using grey correlation analysis and entropy methods. This study examined the impact of agricultural supply chain finance on rural economic development. Using the grey correlation analysis method, the results showed that the index of the rural financial development structure had the highest correlation with rural economic development, which was 0.7998. On the other hand, the entropy method found that the index of the financial development scale had the largest impact on rural economic development, which was 0.78. This study concluded that agricultural supply chain finance has a positive effect on the development of the rural economy, and agricultural core enterprises play a critical role. The evidence from China can provide some new modes for the development of rural finance. Moreover, agricultural supply chain finance has a significant effect on improving the rural economy. Most importantly, this study highlights the critical role of agricultural core enterprises in the development of agricultural supply chain finance.

광역상수도 비용배분문제에 대한 게임이론접근법 도입방안 연구

김상우,이정전 대한국토·도시계획학회 2006 國土計劃 Vol.41 No.3

Much-talked overinvestment in water supply facilities is partly due to the cost allocation problem associated with multi-regional water supply. Recognizing this fact, this paper is intended to propose a rational cost allocation mechanism that is based on the Shapley value method. The Shapley value method and it's special form, the serial cost sharing method satisfy the fairness conditions for the cost allocation. This is particularly relevant to the multi-regional water supply problem we face. Especially, the serial cost sharing method has an advantage in that it is relatively simple to apply. In addition to these two methods, this paper proposes a new version that combines the Shapley value method and the serial cost sharing method. Then, this version is applied to the case of Metropolitan water supply system. As a result of the application, it was estimated that the price of water per ton would decline by about 90 Won on the average. In addition, it was also estimated that more than 2 trillion Won could be saved in the national budget.키 워 드 광역상수도, 비용배분방법, 협조적 게임이론, 샤플리밸류, 순차적 배분방법Keywords Multi-regional Water Supply, Cost Allocation Methods, Cooperative Game Theory, Shapley Value, Serial Cost Sharing

분산형 용수공급시스템 구축을 위한 정수처리시설 최적 위치 결정

장동일,하금률,강기훈,김정현,전환돈 대한상하수도학회 2013 상하수도학회지 Vol.27 No.1

Major issues in water supply service have changed from expansion of service area to improvement of service quality, i.e., water quality and safety, and early response to emergency situation. This change in the service concept triggers the perceptions of limitation with the current centralized water supply system and of necessities of decentralized (distributed) water supply system (DWSS), which can make up the limitations. DWSS can reduce the possibility of water supply outage by establishing multiple barriers such as emergency water supply system, and secure better water quality by locating treatment facilities neighboring consumers. On the other hand, fluctuation of water demand will be increased due to the reduced supply area, which makes difficult to promptly respond the fluctuating demand. In order to supplement this, hybrid water supply system was proposed,which combined DWSS with conventional water supply system using distributing reservoir to secure the stability of water supply. The Optimal connection point of DWSS to existing water supply network in urban area was determined by simulating a supply network using EPANET. Optimal location of decentralized water treatment plant (or connection point) is a nodal point where changes in pressure at other nodal points can be minimized. At the same time, the optimal point should be selected to minimize hydraulic retention time in supply network (water age) to secure proper water quality. In order to locate the point where these two criteria are satisfied optimally, Distance measure method, one of multi-criteria decision making was employed to integrate the two results having different dimensions. This methodology can be used as an efficient decision-support criterion for the location of treatment plant in decentralized water supply system.

An Integrated Approach to Measuring Supply Chain Performance

Adisak Theeranuphattana,John C.S. Tang,Do Ba Khang 대한산업공학회 2012 Industrial Engineeering & Management Systems Vol.11 No.1

Chan and Qi (SCM 8/3 (2003) 209) developed an innovative measurement method that aggregates performance measures in a supply chain into an overall performance index. The method is useful and makes a significant contribution to supply chain management. Nevertheless, it can be cumbersome in computation due to its highly complex algorithmic fuzzy model. In aggregating the performance information, weights used by Chan and Qi-which aim to address the imprecision of human judgments-are incompatible with weights in additive models. Furthermore, the default assumption of linearity of its scoring procedure could lead to an inaccurate assessment of the overall performance. This paper addresses these limitations by developing an alternative measurement that takes care of the above. This research integrates three different approaches to multiple criteria decision analysis (MCDA)-the multiattribute value theory (MAVT), the swing weighting method and the eigenvector procedure-to develop a comprehensive assessment of supply chain performance. One case study is presented to demonstrate the measurement of the proposed method. The performance model used in the case study relies on the Supply Chain Operations Reference (SCOR) model level 1. With this measurement method, supply chain managers can easily benchmark the performance of the whole system, and then analyze the effectiveness and efficiency of the supply chain.

An Integrated Approach to Measuring Supply Chain Performance

Theeranuphattana, Adisak,Tang, John C.S.,Khang, Do Ba Korean Institute of Industrial Engineers 2012 Industrial Engineeering & Management Systems Vol.11 No.1

Chan and Qi (SCM 8/3 (2003) 209) developed an innovative measurement method that aggregates performance measures in a supply chain into an overall performance index. The method is useful and makes a significant contribution to supply chain management. Nevertheless, it can be cumbersome in computation due to its highly complex algorithmic fuzzy model. In aggregating the performance information, weights used by Chan and Qi-which aim to address the imprecision of human judgments-are incompatible with weights in additive models. Furthermore, the default assumption of linearity of its scoring procedure could lead to an inaccurate assessment of the overall performance. This paper addresses these limitations by developing an alternative measurement that takes care of the above. This research integrates three different approaches to multiple criteria decision analysis (MCDA)-the multiattribute value theory (MAVT), the swing weighting method and the eigenvector procedure-to develop a comprehensive assessment of supply chain performance. One case study is presented to demonstrate the measurement of the proposed method. The performance model used in the case study relies on the Supply Chain Operations Reference (SCOR) model level 1. With this measurement method, supply chain managers can easily benchmark the performance of the whole system, and then analyze the effectiveness and efficiency of the supply chain.

할당 공정성이 육군 공급사슬에 미치는 영향 연구: 비례할당 방식과 무작위할당 방식을 중심으로

임정혁,문성암 한국로지스틱스학회 2022 로지스틱스연구 Vol.30 No.3

Recently, Fairness has emerged as an important factor in various fields of our society, and the need for research on the effect of fairness on Army supply chains that are difficult to estimate inventory shortage costs has been raised. therefore, The purpose of this study is to analyze how fairness affects the efficiency of the Army supply chain. To this end, a research model consisting of two divisions and one logistics support brigade supporting them was created to conduct experiments separated by proportional and random allocation methods, and simulations were conducted using system dynamics based on the results of the experiment. Experiments show that soldiers generally think the proportional allocation method is fairer, but the order quantity is 1.29 times greater than the random allocation method. As a result of reflecting this in the simulation, it was confirmed that the proportional allocation method was inefficient with more inventory than the random allocation method in terms of the inventory of the two divisions and the total cost of the supply chain. As a result, it was confirmed that the proportional allocation method only provides the misunderstanding of fairness and results in inefficiency of the supply chain. This study provides management implications and future research directions based on these results.

수단O/D기반 및 P/C기반 화물수요추정방식의 실증적 비교: 우리나라 컨테이너 화물을 중심으로

김현승,박동주,김찬성,최창호,조한선 대한교통학회 2013 대한교통학회지 Vol.31 No.2

This study deals with the comparative analysis between two freight demand estimation methods: Unimodal O/D based method and P/C based method. The data of access/egress truck trips has been omitted from the Korean freight unimodal O/D of KTDB. This is because KTDB's unimodal O/D has not marked the series of unlinked trips down as the whole freight intermodal transport and surveyed only the main-haul trips of them. For these reasons, freight intermodal transport mechanism has not been analysed perfectly with Korean unimodal O/D data. This study tries to estimate P/C table of Korean Import/Export container freight and develop the MCC(Multimodal Channel Choice) model. Then, comparing unimodal O/D based method and P/C based method in terms of the switch commodities between production point(the initial point of freight transport) and consumption point(the terminal point of freight transport), unimodal commodities, and commodities on links is conducted. The results show that the P/C based method is able to simulate the freight intermodal transport. 이 연구는 우리나라에서 현재까지 사용되어 온 (수단O/D기반)화물수요추정법의 문제점 인식을 바탕으로 P/C기반 화물수요추정법과 비교 분석을 수행하였다. 우리나라 화물수단O/D는 화물의 최초기점과 최종종점 간 운송을 수단별 통행으로 나누어 인식하면서 접근트럭통행(Access/Egress Truck Trip)에 대한 정보가 누락되어있다. 이러한 이유로 수단O/D기반 화물수요추정법은 화물의 복합수단운송을 반영하지 못하는 단점이 있다. 이에, 본 연구는 우리나라 컨테이너 화물을 중심으로 P/C표와 복합수단선택모형을 추정하여 P/C기반 화물수요추정법을 제시하고, 기존 사용되어 오던 수단O/D기반 화물수요추정법과 기종점쌍 간 전환량, 수단통행물동량, 링크물동량을 비교하였다. 비교 결과 P/C기반 화물수요추정법은 복합운송을 제대로 모사하지 못하는 기존 수단O/D기반 화물수요추정법의 문제점을 해결할 수 있는 것으로 평가되었다.

UAV와 USV를 활용한 저수지 물수지 분석에 따른 용수공급 방안

김준현,김성훈,권기욱 한국지적학회 2020 한국지적학회지 Vol.36 No.3

In this study suggested according to the results of water balance analysis in additional agricultural water acquisition method for drought that used the water level and available reservoir storage of the reservoir of precise surveying with the effective storage volume and the surrounding land use status by using USV and UAV. As a result of water balance analysis, that an average of 976,2000㎥ of water is required annually in order to supply 127.4ha of agricultural water that required for farmland irrigation from the water collected the reservoir basin area of 72.0ha, The annual average inflow of the Pungyang-reservoir was 599,2000㎥, and the annual shortage was 377,0000㎥. Also, It was necessary to present a method to supply agricultural water in preparation for drought in accordance with the environment around the reservoir. In this study was suggested that case of the reservoir of available reservoir storage was depleted by 50%, 30%, or depletion for agricultural water supply method. 본 연구에서는 USV와 UAV를 이용하여 저수지의 수위 및 저수량을 정밀 측량을 실시하고, 주변 토지이용현황과 유효저수량을 이용하여 물수지 분석결과에 따른 가뭄시 추가적인 농업용수 확보방안을 제시하였다. 물수지 분석을 실시한 결과, 유역면적 72.0ha에서 집수된 용수를 127.4ha의 농경지 관개에 필요한 농업용수를 공급하기 위해서는 연평균 976.2천㎥의 용수가 필요하며, 현재 풍양지의 유입량은 연평균 599.2천㎥이며 연간 부족량은 377.0천㎥로 분석되었다. 또한 가뭄시 저수지 주변환경에 부합하는 농업용수의 공급방안을 제시할 필요가 있어서, 본 연구에서는 저수지의 유효저수량이 50%, 30%, 고갈인 경우에 대비하여 용수공급 방안을 제시하였다.

소독능을 고려한 송수펌프 최적운영기법 개발

형진석,김기범,서지원,김태현,구자용 대한상하수도학회 2018 상하수도학회지 Vol.32 No.5

Water supply/intake pumps operation use 70~80% of power costs in water treatment plants. In the water treatment plant, seasonal and hourly differential electricity rates are applied, so proper pump scheduling can yield power cost savings. Accordingly, the purpose of this study was to develop an optimal water supply pump scheduling scheme. An optimal operation method of water supply pumps by using genetic algorithm was developed. Also, a method to minimize power cost for water supply pump operation based on pump performance derived from the thermodynamic pump efficiency measurement method was proposed. Water level constraints to provide sufficient disinfection performance in a clearwell and reservoirs were calibrated. In addition, continuous operation time constraints were calibrated to prevent frequent pump switching. As a result of optimization, savings ratios during 7 days in winter and summer were 4.5% and 5.1%, respectively. In this study, the method for optimal water pump operation was developed to secure disinfection performance in the clearwell and to save power cost. It is expected that it will be used as a more advanced optimal water pump operation method through further studies such as water demand forecasting and efficiency according to pump combination.