114와 민도(民度)

이기열 한국사법행정학회 1977 사법행정 Vol.18 No.11

태양광 발전시스템의 경제성 분석

이기열,문정태,정무영 대한산업공학회 2008 대한산업공학회 추계학술대회논문집 Vol.2008 No.11

Solar energy is a renewable energy source which is economically viable and environmentally friendly. The demand for solar electric power system, that is photovoltaic system, has grown steadily over the last 10 years. However, one of the major obstructions with the spread of photovoltaic system is the economic feasibility related to initial cost. Other disturbances are cost of electric energy, capacity of the photovoltaic system, discount rate, inflation rate, and so on. In this paper, economic evaluation of photovoltaic system is presented and discussed. To pursue an economic evaluation, the payback period is employed with a sensibility analysis and a risk analysis affecting the payback period. Other factors such as change of initial cost, cost of electric energy, inflation rate, etc. are also discussed.

규제 완화에 따른 전력시장 재구성에서의 위험 요소

이기열,정무영 대한산업공학회 2009 대한산업공학회 춘계학술대회논문집 Vol.2009 No.5

Over the last two decades, many countries have deregulated some of their utility industries. This deregulation has created new dynamic industries. Especially, for the electricity industries, an issue of risk management becomes important in the context of reconfiguration of electricity market environment. In order to avoid depression due to the breakout, each entity in the electric supply networks should understand its internal and external risk factors and establish suitable mitigating strategies. In this paper, we extract risk factors of an electric supply network through the analysis of idiosyncratic nature of electricity. Then, we compare the extracted risk factors with those of supply chain risk management (SCRM) to derive appropriate mitigating strategies. Possible contributions of the proposed mitigating strategies for the reconfiguration of electricity market structure are presented and discussed.

가상기업 생성에 있어서의 위험 관리 모델

이기열,문정태,정무영 대한산업공학회 2008 대한산업공학회 춘계학술대회논문집 Vol.2008 No.5

Dynamic and flexible enterprise networks are essential components for a global industry. To cope with a dynamic environment, enterprises frequently collaborate with other enterprises in the different as well as in the same domains. Virtual enterprise (VE) is an innovative network model to support such enterprise collaborations. In VE, the success is largely dependent upon the selection of partners. Minimizing risk and maximizing trust are two most important factors to guarantee this success. In this paper, a new concept of risk and risk factors in the VE creation are proposed and described. Risk, as a kind of criteria for partner selection, is a partner’s uncertainty that causes negative effects on VE like cost, due date and so on. Since trust is based on the competency and reputation of potential partners, it cannot fully represent partners ’ intrinsic uncertainties. Thus, risk management becomes an essential issue for the partner selection process. Comparison between the risk management in VE and those in the project and the system managements is presented and discussed. A methodology for reducing risks caused from partner selection in VE is also discussed and suggested.

에이전트 기반의 벼 기능 유전자 통합 데이터베이스

이기열,신문수,안수영,정동훈,안진흥,정무영 대한산업공학회 2006 대한산업공학회 춘계학술대회논문집 Vol.2006 No.5

조달 공급망 관리를 위한 차량 계획

이기열,정무영 한국경영과학회 2013 한국경영과학회 학술대회논문집 Vol.2013 No.5

Despite the fact that inbound supply chain plays an important role in the entire supply chain, it has not been paid much attention compared with outbound supply chain. Furthermore, in order to manage inbound supply chain, quite different characteristics of inbound vs. outbound, environmental constraints, and production policy should be considered. In this paper, characteristics of inbound supply chain are discussed and a novel approach for managing inbound supply chain is proposed. The proposed approach generates a vehicle routing schedule to efficiently manage inbound supply chain considering the production plan and the manufacturing policy. Operating mechanism is also described and a simulation study is conducted to validate the proposed approach.

멀티 패스 방법을 이용한 조달 물류에서의 차량 운영 계획법

이기열,조현보,정무영 한국경영과학회 2011 한국경영과학회 학술대회논문집 Vol.2011 No.5

In inbound logistics, a careful vehicle routing planning is required to cope with inventory and quality problems arising when LCD manufacturing adopts a just-in-time (JIT) raw material delivery philosophy. Dynamic environments that disturb the system"s flexibility and robustness should be considered, such as regulation of stocks, distance of vendors, time limits of delivery, and changes of production plan. Before the generation of vehicle routing plan, however, other factors associated with the company"s policy such as the number of vehicles, time allowance of JIT, and inventory level should be considered. In this paper, multi-pass simulation as a kind of the rule-based approach was employed to determine the optimal values of these factors. And then using these values, vehicle routing plan was created by consideration of various constraints. The details of simulation algorithm and simulation results of the proposed method are presented and demonstrated through a case study.

가상기업 생성에 있어서의 위험 관리 모델

이기열,문정태,정무영 한국경영과학회 2008 한국경영과학회 학술대회논문집 Vol.2008 No.5

Dynamic and flexible enterprise networks are essential components for a global industry. To cope with a dynamic environment, enterprises frequently collaborate with other enterprises in the different as well as in the same domains. Virtual enterprise (VE) is an innovative network model to support such enterprise collaborations. In VE, the success is largely dependent upon the selection of partners. Minimizing risk and maximizing trust are two most important factors to guarantee this success. In this paper, a new concept of risk and risk factors in the VE creation are proposed and described. Risk, as a kind of criteria for partner selection, is a partner’s uncertainty that causes negative effects on VE like cost, due date and so on. Since trust is based on the competency and reputation of potential partners, it cannot fully represent partners ’ intrinsic uncertainties. Thus, risk management becomes an essential issue for the partner selection process. Comparison between the risk management in VE and those in the project and the system managements is presented and discussed. A methodology for reducing risks caused from partner selection in VE is also discussed and suggested.

조달 공급망 관리를 위한 차량 계획

이기열,정무영 대한산업공학회 2013 대한산업공학회 춘계학술대회논문집 Vol.2013 No.5

Despite the fact that inbound supply chain plays an important role in the entire supply chain, it has not been paid much attention compared with outbound supply chain. Furthermore, in order to manage inbound supply chain, quite different characteristics of inbound vs. outbound, environmental constraints, and production policy should be considered. In this paper, characteristics of inbound supply chain are discussed and a novel approach for managing inbound supply chain is proposed. The proposed approach generates a vehicle routing schedule to efficiently manage inbound supply chain considering the production plan and the manufacturing policy. Operating mechanism is also described and a simulation study is conducted to validate the proposed approach.

조달 공급망을 위한 규칙 기반 차량 계획 시스템

이기열,정무영 대한산업공학회 2012 대한산업공학회 추계학술대회논문집 Vol.2012 No.11

Supply chain management (SCM) is one of the most important issues in improving enterprises’ profitability. Generally, supply chain consists of three sub-chains, namely inbound, intercompany, and outbound; and many research works for the SCM have considered outbound supply chain as overall supply chain. However, inbound supply chain should be distinguished from the other supply chains at the various aspects. In this paper, peculiar features of inbound supply chain are described in contrast with outbound. Especially, to control the inventory level and generate the vehicle routes in inbound supply chain are more critical than the outbound case. Although inventory routing problems (IRPs) deal with these issues at the outbound supply chain, existing IRPs are not suitable to apply to inbound case because inbound case is more complicated by its intrinsic characteristics. Therefore, IRP for inbound supply chain is also investigated. Using these inbound supply chain’s characteristics, rule-based vehicle routing planning system for inbound supply chain is developed and the details of the proposed system are described via the case study.