• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2002.10a
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• pp.17-20
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• 2002

Hasa TM/TC system is composed of one control center, two reservoirs, six pumping stations and twelve canal systems. For this system we developed water management program which includes flood forecast program, drought reduction program, irrigation scheduling program and database program. With these program we expect that operators can improve the irrigation efficiencies of the irrigation systems due to the timely irrigation on a right place, in a proper quantity and reduce the cost of maintenance and reduce flood and drought damages of the Hasa district. In agricultural engineering respect, the databases including water level, rainfall, the amount of flowing can be useful to the researcher who make a study of hydrology and hydraulics in rural area. Water management program records all of the TM/TC data to MOB format file per 10 minutes.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2001.10a
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• pp.69-73
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• 2001

At this project we developed water management program for sungju district. This program include flood forecast program, drought reduction program, irrigation scheduling program and database program. With these program we expect that operator can improve the irrigation efficiencies of the irrigation systems due to the timely irrigation on a right place, in a proper quantity and reduce the cost of maintenance. In agricultural engineering respect, the databases including water level, rainfall, the amount of flowing can be useful to the researcher who make a study of hydrology and hydraulics in rural area, Water management program record all of the TM/TC data to MDB format file per 10 minutes.

• Proceedings of the KIEE Conference
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• 2002.07a
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• pp.398-400
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• 2002

This paper presents long-term electricity market analysis simulation considering Genco's strategy using P-POOL. In the competitive electricity market, system operation and/or market operation is highly depended on the participants' intention and his planning. We focus on the Genco's strategy, including maintenance scheduling and bidding strategy. And we represent his profit using 3-Bus sample system.

• Proceedings of the KIEE Conference
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• 1999.07c
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• pp.1270-1272
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• 1999

The generator cost function is one of the basic data for the generation scheduling. Generally the cost functions are obtained form design calculations or from heat rate tests. The real operating condition may be different from the condition of design or the tests. Some of the conditions may not be tested during the periodical maintenance. In order to improve the calculation of the generator cost function, this paper presents a new calculation method of the generator cost functions using the utilization factors of generators and the mixed fuel burning ratio of the generators.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.17 no.31
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• pp.99-114
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• 1994

The introduction of new equipments to strengthen the competitiveness of enterprises is one of pretty important factors. Enterprises introducing new equipments strengthen competitiveness through productivity increasing, high quality maintenance, inventory reduction, improved design and production interface, simple scheduling process, low scrap rate, rework reduction, etc. Managers will work out the best equipment-replacing strategy through the appropriate combination of potential cost attributes and qualitative attributes difficult to quantify in accordance with the business purpose. This study is to present a method to select an equipment-replacing alternative through the decision-making model of Analytic Hierarchy Process in consideration of the differences of cost flow of the alternatives, taking into consideration tangible attributes and strategic intangible attributes.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.459-460
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• 2015

현재의 예방정비계획 운영 방법은 KPX에서 발전 사업자들로부터 희망하는 자신들의 발전기 예방정비계획 일정을 받아서 공급예비력 기준을 만족하면 승인을 해주는 방법으로 진행되고 있다. 이는 경제적인 부분을 예방정비계획 수립에 반영하지 못하고 계통의 신뢰도 측면만을 판단하는 것으로 생각할 수 있다. 따라서 발전비용을 최소화하는 예방정비계획 최적화 모델을 적용하여 예방정비계획 수립 시 경제성을 반영하려 한다. 이를 통해 연발전비용을 낮추면서 연평균 SMP 또한 낮춤으로서 한전과 발전사업자 모두에게 이익을 가져다 줄 수 있는 것이다. 따라서 본 연구에서는 비용 최소화를 목적함수로 하는 tool을 적용한 예방정비계획 최적 값과 기존의 예방정비계획을 공급예비율, 계통한계가격(System Marginal Price, SMP), 발전비용 세 가지로 나눠 비교하고 신뢰도와 경제성을 고려한 최적 예방정비계획을 수립하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2004.05b
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• pp.790-793
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• 2004

TM/TC system is composed of control center, reservoirs, pumping stations and twelve canal systems. For this system we developed water management program which includes flood forecast program, drought reduction program, irrigation scheduling program and database program. With these program we expect that operators improve the irrigation efficiencies of the irrigation systems due to the timely irrigation on a right place, in a proper quantity and refute tile cost of maintenance and reduce flood and drought damages. In agricultural engineering respect, the databases including water level, rainfall, the amount of flowing can be useful to the researcher who make a study of hydrology and hydraulics in . rural area. Water management program records all of the TM/TC data to MDB format file per 10 minutes.

• Proceedings of the KIEE Conference
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• 1995.07b
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• pp.543-545
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• 1995

The purpose of this paper is to determine the proper reliability criteria used in generation expansion planning of electric utilities. In this paper, we tried to combine long-term generation expansion planning and short-term weekly maintenance scheduling program package. We set two scenarios in which the O&M technology of power plants will be improved or not in the future. We performed LOLP sensitivity analysis for each scenario to determine the optimum reliability criteria in the power system operation aspects.

• Journal of the Institute of Convergence Signal Processing
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• v.17 no.1
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• pp.1-9
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• 2016

In this paper, for the improvement of quality of service(QoS) performance of heterogeneous networks, multi-cell scheduling is proposed. In order to implement the proposed algorithm, for the recognition of the impact on the throughput performance of users, macro-pico-cells that form distributed architecture were proposed. In operating heterogeneous networks, considering the centralized structure, a macro-RRH(Remote Radio Head) deployment scenario was proposed. For interference mitigation of the proposed system, by applying the optional sub-frame, through CQI(Channel Quality Indicator) measurement for each sub-frame period, constraint conditions were measured according to system situations. For the simplification, the pattern of the same ABS muting was assumed. In the above two multi-cell environments, the algorithm of high-speed load balancing maintenance was proposed.

• The KIPS Transactions:PartA
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• v.14A no.6
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• pp.371-382
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• 2007

Modern server systems are usually composed in the form of cluster systems in order to serve not only as many users but also as many kinds of applications as possible. The progression of the cluster system architecture leads in a middleware approach based on the Java framework. The middleware approach alleviates the efforts for the construction and the management of a server system but still preserves its performance and applications on the server. In this research, we introduce a new clustering scheme for the easy construction and maintenance of a cluster server system with the Java Management Extensions. We first demonstrate the construction and configuration process. Our experiment sets can verify that it is easy to construct, expand and manage a middleware based cluster system as well as the applications which reside on it. In addition, we can achieve reasonable performance on our service oriented clustered system with the help of state-of-the-art middleware. The experimental results of performance demonstration contain the availability of a server, and the effectiveness of load balancing and scheduling mechanisms. Especially, our service oriented scheduling mechanism was shown to successfully manage load imbalance under the normal load and cope with the overloaded situations, compared with other known scheduling mechanisms.