• Nuclear Engineering and Technology
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• 제8권2호
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• pp.101-116
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• 1976

An attempt is made to analyze the unit nuclear power cost of the Go-ri units 1 and 2 in terms of a set of model data. For the calculational purpose, the power cost is first decomposed into the cost components related to the plant capital, operation and maintenance, working capital requirements, and fuel cycle operation. Then, POWERCO-50 computer code is applied to enumerate the first three components and MITCOST-II is used to evaluate the fuel cycle cost component. The specific numerical results are the fuel cycle cost of Go-ri unit 2 for three alternative fuel cycles presumed, levelized unit power cost of units 1 and 2, and the sensitivity of the power cost to the fluctuation of the model data. Upon comparision of the results with the power cost of the fossil power plants in Korea, it is found that the nuclear power is economically preferred to the fossil power. Nevertheless, the turnkey contract value of Go-ri unit 2 appears to be rather expensive compared with the available data on the construction cost of the PWR plants. Therefore, it is suggested that, in order to make the nuclear power plants more attractive in Korea, the unfavorable contract of such kind must be avoided in the future introduction of the nuclear power plant. Capacity factor is of prime importance to achieving the economic generation of the nuclear electricity from the Go-ri plant. Therefore, it is concluded that more efforts should be directed to make the maximum use of the Go-ri plant.

• Communications for Statistical Applications and Methods
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• 제10권2호
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• pp.595-601
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• 2003

In this paper we propose an on line training method for classification based on least squares support vector machine. Proposed method enables the computation cost to be reduced and the training to be peformed incrementally, With the incremental formulation of an inverse matrix in optimization problem, current information and new input data can be used for building the new inverse matrix for the estimation of the optimal bias and Lagrange multipliers, so the large scale matrix inversion operation can be avoided. Numerical examples are included which indicate the performance of proposed algorithm.

• Journal of applied mathematics & informatics
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• 제26권1_2호
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• pp.337-347
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• 2008

Based on social welfare maximum theory, the optimal scale of power plants entering generation power market being is researched. A static non-cooperative game model for short-term optimization of power plants with different cost is presented. And the equilibrium solutions and the total social welfare are obtained. According to principle of maximum social welfare selection, the optimization model is solved, optimal number of power plants entering the market is determined. The optimization results can not only increase the customer surplus and improve power production efficiency, but also sustain normal profits of power plants and scale economy of power production, and the waste of resource can also be avoided. At last, case results show that the proposed model is efficient.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 한국건설관리학회 2003년도 학술대회지
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• pp.254-257
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• 2003

It is common to experience delays during construction projects. Delays can ca use substantial damages to an owner as well as contractors and is the sources of frequent disputes and claims. Many studies have been carried out to assess the causes of delays in construction projects. They are found to be almost similar, except some prevailed local condition. Most of the common construction delay factors are attributed to design faults, incompetent contractor, lack of team accountability etc. To minimize or eliminate the delay we have to follow the recognized fundamental principles of management such as: cost-time relationship, time priority, accountability, rewards, innovative thinking etc. The root causes of delays found out in this paper are not so much different than other previous study. If the implementing agencies properly followed the, fundamental management principles and some other related corrections as recommended in the paper, much construction delays can be avoided.

• Proceedings of the KIEE Conference
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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• pp.1177-1178
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• 2006

본 논문은 해외 신재생에너지 발전전력의 구입가격에 관한 제도 및 구입가격 결정 방법론을 통해 시사점을 파악하여 활용방안을 도출한다. 신재생에너지 발전전력은 기존 전원에 비해 발전원가 수준이 높은 상황에서 보급확산을 위해 유럽을 중심으로 다양한 신재생에너지 발전전력 구매정책을 수립하여 시행하고 있다. 국내에서는 발전차액지원제도를 통해 신재생에너지 발전전력을 높은 가격에 의무구매하고 있는 상황에서 해외 주요국의 제도현황과 접근방법을 파악하여 국내 발전차액지원제도의 수립에 활토록 한다.

• Proceedings of the KIEE Conference
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• 대한전기학회 2007년도 추계학술대회 논문집 전력기술부문
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• pp.159-161
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• 2007

전 세계적으로 에너지 소비가 지속적으로 증가하고 BRICS 국가들의 경제 발전으로 인하여 빠르게 에너지가 감소하고 있다. 또한 에너지기후협약에 따른 온실가스 감축에 대해 관심이 증가되고 있는 가운데 에너지효율을 높이기 위한 노력이 증가되고 있다. 고효율 인버터는 에너지절간 가능부하 전동기에 인버터를 설치하여 회전속도를 감소시킴으로서 소요 동력이 회전수의 3승에 비례해서 감소해 에너지를 크게 절감할 수 있는 기기 이다. 본 연구에서는 고효율 인버터의 확산모형과 인버터 설치시 회피비용에 거하여 적정한 지원금 산정 방안을 분석하여 제시한다.

• Proceedings of the KIEE Conference
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.589_590
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• 2009

This paper presents a unique approach to scheme a demand response (DR) program in the electricity market from a customer-oriented perspective, which is based on the analytic hierarchy process (AHP). The proposed program is designed as an incentive-based program (IBP) considering Korea power systems with the cost-based generation pool (CBP). And the proposed DR program has the objective to maximize social welfare corresponding customers‘ participation and the constraints including incentive payments, the specific load curtailment conditions and reserve-margin criterion. A test system for the case study is used to demonstrate the usefulness and applicability of the proposed approach, and the load profiles with the proposed DR program are obtained. The results show not only the revenue attributable to the avoided costs but also enhancement of system reliability.

• Journal of Sensor Science and Technology
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• 제17권2호
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• pp.106-113
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• 2008

Perceiving a 3D moving target is important for automated machines including robots in a factory. Although stereovision or ultrasonic ranging is often employed for the purpose, the former requires high-cost systems, and the latter suffers from low-resolution. In this paper, we propose a PSD sensor array to acquire the 3D profile of an object conveyed by a belt. Rectangular parallelepiped target objects at random positions and orientations are assumed. Nine PSD sensors are configured in a $3{\times}3$ array above the belt, and fired in a sequence so that cross-talk can be avoided. Time gaps among sensor readings are compensated to get a result that is obtainable when sensors' measurements are made simultaneously along a sensing line. The system designed is tested with various objects in experiments.

• Proceedings of the KIEE Conference
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• 대한전기학회 2008년도 춘계학술대회 논문집 전기설비전문위원
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• pp.3-5
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• 2008

In this paper, a modified diffusion model integrated with the effects of rebate programs is developed. The greater part of motors is included to various systems such as pump systems, fan systems, ventilation systems, motor itself, and so on. Hence, the existing rebate program is not suitable for these systems and a generalized rebate model for these systems is necessary. In the pre-study, a new diffusion model for motor rebate Program was proposed and the adequacy of this model was evaluated in the case of Korea. This paper shows that the motor rebate model could be applied to the case of pumps.

• Proceedings of the KIEE Conference
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 A
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• pp.341-342
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• 2006

전력시스템에 수요관리나 효율향상프로그램 또는 분산형 전원을 도입하는 경우 전력회사의 측면에서는 수입의 감소와 함께 각종 비용에 대한 절감효과가 동시에 발생을 하며, 이러한 비용절감효과를 회피비용으로 정의하고 있는데 이러한 회피비용 중 최대수요의 감소로 인하여 송배전설비의 투자시점이나 투자비용이 변화하게 되어 발생되는 회피비용을 송배전설비회피비용이라고 정의한다. 지금까지 한계비용이나 현재가치법을 이용한 방법론들이 개발되었으나, 최대수요 예측이나 수요 감소효과의 예측 값에 대한 불확실성을 고려한 방법은 없었다. 이에 논문에서는 미래예측값에 대한 불확실성을 고려할 수 있는 One-Year Deferral방법론을 제안하고 이에 대한 사례분석을 시행하였다.