• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.1
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• pp.61-67
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• 2003

This paper presents a power transfer capability calculation algorithm considering initial maximum power transfer capability. In this method initial maximum power transfer capability is calculated first. Then, the initial value of active power outputs of generators is gotten for power transfer capability calculation. The proposed method is applied to IEEE-24 Reliability Test System and the results show the effectiveness of the method.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.3
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• pp.18-24
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• 2003

This paper presents a power transfer capability calculation algorithm considering voltage stability margin. In this method, voltage stability margin constraints are incorporated into a power transfer capability formulation to guarantee adequate voltage security levels in an interconnected power system The proposed method is applied to IEEE-24 reliability test systems and the results show the effectiveness of the method.

• Journal of the military operations research society of Korea
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• v.32 no.1
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• pp.36-50
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• 2006

It is required to transport a considerable amount of wartime strategic materials from US to Korea via airlift operation. This study attempts to formulate the wartime airlift operation model and evaluate the airlift capability of mobilized resources, including civil aircrafts. Although an airlift plan has been annually updated by the Korea Transportation Command, it is necessary to evaluate the feasibility through simulation due to uncertainties in the process of airlift operation. Uncertain parameters are as follows; the inter-arrival time of materials in the US airfields, loading and unloading times, the distribution of aircraft's initial location at the time of mobilization order. The simulation is executed under two scenarios and the results are analyzed through a sensitivity analysis. Simulation result shows that the irregularity of inter-arrival time and the number of mobilized civil aircrafts are the most critical factors in influencing airlift capability.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.48 no.7
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• pp.872-880
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• 1999

This paper presents an algorithm that can calculate the evaluation index of power system from the transfer capability point of view. The algorithm adopts a successive linear programming skill to solve an optimal solution. Two indices which are transfer margin index and economic matching index have been developed. Prior to calculating these indices, Maximum Load supplying Capability(MLSC) and Economic Load Supplying Capability(ELSC) are utilized as basic data. For man-machine interface, graphical user interface has been implemented so that an unified software package PSTCP(Power System Transfer Capability Program) has been developed. KEPCO systems planned up to 2006 year have been tested to show effectiveness and usefulness of the PSTCP for power system planning stages.

• Proceedings of the KSR Conference
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• 2003.10a
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• pp.73-122
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• 2003

수송능력: 공로에 비해 단위폭(1m)당 여객 3.6배, 화물 4.1배 수송가능. 수송효율성 측면: 4,000명 이상, 철도＞버스(중략)

• 대한공업교육학회지
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• v.35 no.2
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• pp.159-181
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• 2010

This study aims to verity effects of project method on the girl students' task performance ability in the unit of 'Energy and Transportation Technology' of Technology' Home Economics Subject in High schools. The task performance ability are composed of collecting information, performing achievement, planning of solving the task, and performance evaluation. The results of this research conducted for girl students of two classes of H high school located in Gyeong-gi Province are as follows: First, the group with the project method was more effective, in general, in learning ability of performing the tasks of 'Energy and Transportation Technology' than the group with traditional teaching. Second, the group with the project method was more effective than the group with traditional teaching in ability of task performance of subordinate elements of performing tasks in the unit of 'Energy and Transportation Technology', such as collecting information and performing achievement. However, in the fields of another subordinate elements of planning of solving the task and performing evaluation, the degree of effectiveness was unknown. After examining the results of all the cases, it was found that project method was more effective than the traditional teaching method in increasing the performing task abilities of the students in the lesson of 'Energy and Transportation Technology' in high schools.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.49 no.4
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• pp.161-167
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• 2000

This paper presents a new methodology that can evaluate transfer capability of composite power systems from the adequacy point of view in power system planning stages. First of all, to evaluate practical load supplying capability, nonlinear optimization problems of maximum load supplying capability(MLSC) and economic load supplying capability(ELSC) are formulated and solved by nonlinear primal-dual interior point method. Here, physical constraints considered in the optimization problems are the limits of bus voltage, line overloading, and real & reactive power generation. Also, an evaluation method of transfer capability is presented based on margins calculated by the MLSC and ELSC. Especially, to evaluate transfer capability flexibly, simple indices such as expected MLSC, transfer capability margin, and power not supplied are respectively proposed by considering (N-1) line outage probability. Numerical results on IEEE RTS 24, IEEE 118, and IEEE 300 bus system show that the proposed algorithm is effective and useful for power system planning stages.

• Korean Journal of Plant Tissue Culture
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• v.27 no.1
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• pp.47-50
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• 2000

In suspension cultures of Streptanthus. the uptake rate of sugar was increased during the ceil starvation of sugar in the medium. The maximal uptake rate obtained with 3 days of cell starvation. Sugar transport system induced by the sugar starvation was completely inhibited by 10 $\mu$M cycloheximide. Plant cells are known to possess only one sugar transport system, but the uptake rate of glucose obtained a saturated kinetic while the one of sucrose had two different kinetics after the sugar starvation. Induced sugar transport systems had different kinetics compared to plant cell. These results showed that higher plants have adaptable ability to induce new sugar transport systems when the environment changed unsuitable.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.55 no.1
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• pp.24-28
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• 2006

This paper presents a power transfer capability calculation algorithm considering transient stability, The theoretical development is straightforward: dynamic equations are converted to numerically equivalent algebraic equation and then integrated into the standard formulation for power transfer capability calculation. The proposed method is applied to IEEE-24 Reliability Test System and the results shows the effectiveness of the method.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.52 no.10
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• pp.557-562
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• 2003

This paper presents a power transfer capability calculation algorithm considering the closest saddle node bifurcation for voltage stability margin. In this method, voltage stability margin constraints considering the closest saddle node bifurcation are incorporated into a power transfer capability formulation to guarantee adequate voltage security levels in an interconnected power system. The proposed method is applied to IEEE-24 reliability test system and the results show the effectiveness of the method.