• 설비공학논문집
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• 제20권9호
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• pp.624-630
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• 2008

When various kinds of outputs are produced from a single energy system, the methodology which allocates the common cost to each output cost is very important because it is directly related with the profit and loss of producers and purchasers. In the cost allocation methodology of the heat and the electricity on a cogeneration, there are energy method, work method, proportional method, benefit distribution method, exergetic methods, and so on. On the other hand, we have proposed a worth method which can be applied to any system. The definition of this methodology is that the unit cost of a product is proportion to the worth. Where, worth is a certain evaluating basis that can equalize the worth of products. In this study, we applied worth method to a steam-turbine cogeneration which produces 22.2 MW of electricity and 44.4 Gcal/h of heat, and then we allocated 2,578 $/h of common cost to electricity cost and heat cost. Also, we compared with various cost allocation methods. As the result, we conclude that exergy of various kinds of worth basis evaluates the worth of heat and electricity most reasonably on this system.

• 전자공학회논문지C
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• 제35C권3호
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• pp.46-58
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• 1998

Multi-disk data allocation problem examined in this paper is to find a method to distribute a Binary Cartesian Product File on multiple disks to maximize parallel disk I/O accesses for partial match retrieval. This problem is known to be NP-hard, and heuristkc approaches have been applied to obtain sub-optimal solutions. Recently, efficient methods have been proposed with a restriction that the number of disks in which files are stored should be power of 2. In this paper, we propose a new disk Allocation method based on Genetic Algorithm(GA) to remove the restriction on the number of disks to be applied. Using the schema theory, we prove that our method can find a near-optimal solutionwith high probability. We compare the quality of solution derived by our method with General Disk Modulo, Binary Disk Modulo, and Error Correcting Code methods through the simulation. The simulation results show that proposed GA is superior to GDM method in all cases and provides comparable performance to the BDM method which has a restriction on the number of disks.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권9호
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• pp.3008-3028
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• 2022

In this paper, we investigate traffic scheduling for a delay-sensitive multi-hop relay network, and aim to minimize the priority-based end-to-end delay of different data packet via joint relay selection, subcarrier assignment, and power allocation. We first derive the priority-based end-to-end delay based on queueing theory, and then propose a two-step method to decompose the original optimization problem into two sub-problems. For the joint subcarrier assignment and power control problem, we utilize an efficient particle swarm optimization method to solve it. For the relay selection problem, we prove its convexity and use the standard Lagrange method to deal with it. The joint relay selection, subcarriers assignment and transmission power allocation problem for each hop can also be solved by an exhaustive search over a finite set defined by the relay sensor set and available subcarrier set. Simulation results show that both the proposed routing scheme and the resource allocation scheme can reduce the average end-to-end delay.

• 한국물환경학회지
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• 제26권1호
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• pp.168-176
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• 2010

This study proposes the improvement of the present Total Maximum Daily Load (TMDL) management system of MOE (Ministry of Environment). The margin of safety (MOS) is calculated by a method using standard error and a method using variability and uncertainty. The allocation of pollutant loads are calculated using three methods, equal load reduction method, equal percent removal method and method using equity standards. This study applied the improved TMDL management system to the Anyangcheon watershed. Since MOS varies from 12% to 44% due to the high variability of measured and simulated data, it must not be ignored in the TMDL. The method using equity standards is the most proper in this application since the others produced unrealistic allocations. Area, runoff, water use quantity, population and budget are considered for equity standards. This study shows that this allocation method can be also applicable for the administrative units as well as the sub-watersheds. Finally, Hydrologic Simulation Program-FORTRAN (HSPF) with the allocated pollutant load was used to confirm whether it satisfy the water quality standard or not. This study will be helpful to improve the MOS and allocation system TMDL in the future.

• 한국산업정보학회논문지
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• 제20권4호
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• pp.111-126
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• 2015

최근 많은 기업들이 협력을 통하여 투자비용과 위험은 분산시키고, 자원과 이익을 공유하여 경쟁력 강화를 시도하고 있다. 기업 간 공유경제는 기업 간 협력의 한 형태로 기업이 보유하고 있는 유휴자원을 공유하여 그 효용을 높이는 경제적 활동이다. 다양한 이해관계자가 참여하는 기업 간 공유경제에서는 이익의 명확한 배분 방안이 있어야 한다. 따라서 본 연구에서는 기업 간 공유경제를 위한 연합 구성시 발생하는 거래비용을 적용할 수 있는 MST(Minimal Spanning Tree) 방법, 각 참가자들이 주도하여 발생하는 거래비용의 평균, 참가자 간 발생하는 거래비용에 대하여 샤플리 밸류 적용의 3가지 방법을 제안하였다. 또한 협조적 게임이론에 근거한 이익 배분 방법인 이익 균등배분(Equal distribution of gain), 이익 비례배분(Proportional distribution of gain), 샤플리 밸류(Shapley Value)에 거래비용을 적용한 이익 배분 방안을 제시하였다.

• 한국해양공학회지
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• 제26권3호
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• pp.20-25
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• 2012

In this paper, the authors propose a new approach to the control problem of marine vessels that are moored or controlled by actuators. The vessel control system is basically based on Dynamic Positioning System (DPS) technology. The main object of this paper is to obtain a more useful control design method for DPS. In this problem, the control allocation is a complication. For this problem, many results have been given and verified by other researchers using a two-step process, with the controller and control allocation design processes carried out individually. In this paper, the authors provide a more sophisticated design solution for this issue. The authors propose a new design method in which the controller design and control allocation problems are considered and solved simultaneously. In other words, the system stability, control performance, and allocation problem are unified by an LMI (linear matrix inequality) based on control theory. The usefulness of the proposed approach is verified by a simulation using a supply vessel model.

• 한국신뢰성학회지:신뢰성응용연구
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• 제14권1호
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• pp.29-35
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• 2014

To improve the reliability of a weapon system, we perform the activities: setting the target reliability, reliability allocation, and reliability management, etc. Before starting weapon system development, the target reliability of system is set through advanced research and is allocated to its subsystems at the beginning of development. Then we manage the reliability of system and subsystems to meet the target reliability until completion of system development. In this paper, we research representative reliability allocation methods and introduce the suitable reliability allocation method followed by its application to the underwater guided weapon system. The purpose of this research is to review the proposed reliability allocation techniques and find an appropriate method for underwater weapon systems followed by the validation of its application.

• 대한기계학회논문집A
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• 제38권10호
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• pp.1179-1184
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• 2014

일반적으로 신뢰도 배분은 시스템 개발 초기단계에 시스템의 신뢰도 목표 값을 하위 모듈에 배분하기 위해 사용된다. 본 연구에서는 KTX 승강문 시스템의 목표 신뢰도를 하위 모듈에 배분하기 위해 Comprehensive 배분방법을 제시한다. Comprehensive 배분방법은 시스템의 신뢰도를 배분하기 위해 각 모듈에 대한 고장의 중요도, 작동시간 비율, 위험도, 복잡도, 고장률, 수리/정비성, 개발완성도, 사용환경 가혹도, 신뢰도 달성비용의 평가항목을 고려한다. 승강문 시스템의 목표 신뢰도를 만족하기 위해서 시스템을 구성하는 4 가지 모듈의 $B_{10}$ 수명을 제시한다.

• 한국통신학회논문지
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• 제31권12B호
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• pp.1068-1075
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• 2006

주파수 자원 가치는 무선통신의 발전과 함께 더욱 커지고 있다. 하지만 앞으로 정보화 사회에서는 주파수 자원의 수요가 공급에 비하여 매우 많기 때문에 주파수 부족 현상이 심각하게 대두된다. 따라서 사용되지 않고 있는 주파수 자원을 효율적으로 이용하기 위한 기술로서 최근 각광을 받고 있는 Cognitive Radio 기술이 필요한 시점이다. 본 논문에서는 CR 기반의IEEE 802.22 WRAN 환경에서 효율적인 Dynamic Spectrum Allocation 기법을 제안한다. Spectrum을 좀 더 효율적으로 공유하기 위해 Variable bandwidth, Mobility의 변수를 적용한 Dynamic Spectrum Allocation 기법을 제시하고 시뮬레이션 결과들을 통해 이를 검증하였다.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2005년도 추계학술대회 및 정기총회
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• pp.361-364
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• 2005

As increasing the Internet traffic, many researches on access network are reported for end-to-end high-speed broadband network, where E-PON(Ethernet-Passive Active Network) is one of reasonable candidate fur the network with respect to cost and bandwidth utilization. For the high-speed access network, E-PON need an efficient bandwidth allocation method. This paper suggests a WFA(Water-Filling Allocation) algorithm for the efficient bandwidth allocation with various simulation test.