• Proceedings of the Korean Magnestics Society Conference
• /
• 2010.06a
• /
• pp.92-93
• /
• 2010

• Proceedings of the KSR Conference
• /
• 2007.05a
• /
• pp.680-685
• /
• 2007

Power semiconductor which is adapted in the rolling stock has a high practicality for capacity of high voltage and high speed switching. but it has a trouble of fever cause of high speed On, Off switching loss and the operating junction temperature is limited to $150^{/circ}C$ because is made from the silicon for the foundation material. Therefore, it is important to find a way out of this trouble and must make the countermeasure. In this research, the caloric value of the integrated PEM is calculated to adapt the optimized heat pipe and the reliability of the heat pipe is demonstrated through the cooling performance test and vibration test.

• Proceedings of the KSR Conference
• /
• 2007.11a
• /
• pp.135-142
• /
• 2007

The service running of driverless rail vehicle has been required by various social and commercial issue. Currently, the new domestic line between Bu-san and Gim-hae is plan to be provided the LRV(Light Rail Vehicle) with driverless operation firstly in domestic service. These driverless vehicle have some major properties to make it lower the operating and maintenance cost, however on the other side, it unavoidably raise some potential hazard to make it lower the passenger safety because it is hard to take care immediately in emergency state during vehicle running. Therefore it is highly requested that we should consider various conditions at design stage to manufacture and operate the safest vehicle. Therefore, in this paper, we will survey the design concept of vehicle interior facilities based on the previous experience, (1) The difference of interior facilities between normal and driverless vehicle, (2) design and operational concept of passenger side door function to find out best application for domestic line driverless vehicle.

• Journal of Fisheries and Marine Sciences Education
• /
• v.18 no.2
• /
• pp.194-207
• /
• 2006

The purpose of this study was to examine the current student assessment plan of subject domain and to propose ways to improve it. This study analyzed the history of our student assessment plan of subject domain and overviewed the student assessment cases of several countries. And then researchers discussed the improvement plans of student assessment of subject domain. The results of this study are as follows. First, we need to enlarge the use of detailed subject-ability record space or to assess student's subject-related ability according to subordinate perspectives of subject. Second, we need to establish the desirable evaluation-perspective and to develop absolute evaluation criteria of each subject and unit. Third, we need to diffentiate the scores of differentiated test items or equate the scores of differentiated groups.

• Journal of Agricultural Extension & Community Development
• /
• v.15 no.4
• /
• pp.599-619
• /
• 2008

The study is to develop indicators for woman famers center using focus group meeting and AHP(Analytic Hierarchy Process), which is a method to derive relative weights for each evaluation indicators. The results of this study are as follows. We determined such as the three indicators that planning establishment(seven), promotion process of work(six), performance of work(nine). We analysed the weights of this indicators by AHP. The relative weights of performance of work was 0.5269, planning establishment 0.2554 and promotion process of work marked 0.2177. It was suggested that further research should be carried out to develop more objective assessment indicators.

• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.113-114
• /
• 2008

For the supported high-technology, it is in need of estimation about power quality and reasonable price through machinism. The power system made much of precision digital industrial damage under sag. This study suggested electric machine under effects of power quality in the theory and test. A electric machine was simulated and experimented about sag. The test system made up IPC as voltage sag device. The test machine was magnetic contactor and PLC. The result, electric machines appeared to influence sag with CBEMA curve. It was make possible analysis of power system about a fault. This study was expected to method that investment and development of equipment on power market in the future.

• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.298-299
• /
• 2008

In this paper, supposed that can measure power quality of bus and can calculate this cost in case electric charges about customer are imposed by each bus. When reflected this in system planning, expected cost proposed following method through sample system. We calculated the nodal cost by OPF(optimal power flow) in system and the drop numbers that happen during year of loads utilizing VSCC. Also calculated BPQC using the disruption numbers. As a result, calculated bus total cost including power quality cost through case study.

• Journal of Korean Institute of Industrial Engineers
• /
• v.22 no.1
• /
• pp.155-164
• /
• 1996

Biomass to methane via anaerobic digestion conversion is a good supply method of substitutable energy resources. The economic viability of this technology is contingent upon managing the production facilities in a cost effective manner. The problem is to determine the batch production sequence as well as the batch residence times in the digester so as to maximize total gas production over a given planning horizon. The problem is difficult to solve since the batch sequencing decisions and the batch residence time decisions cannot be isolated. This paper developes a heuristic algorithm which is based on a dynamic programming procedure for the multiple feedstock sequencing and scheduling biogas production systems and demonstrates to yield good results.

• Proceedings of the KIEE Conference
• /
• 2015.07a
• /
• pp.1066-1067
• /
• 2015

This paper presents a diagnosis method for the detection and location of open-short switch faults in the three-phase power conditioning system. A method for switch fault diagnosis on the power conditioning system is proposed, based on the concordia transform. The switch fault types and locations on power conditioning system are diagnosed by a method in which analyze the d-q current vector locus and current pattern. The Simulation results confirm the proposed diagnostic method.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
• /
• 2008.05a
• /
• pp.37-40
• /
• 2008

This paper presents the results of a simulation to analyze the effects of voltage sag on high-pressure discharge lamp(400[W]). In this paper, voltage sag is considered a reduction between 0 and 0.9[p.u] in nominal voltage magnitude, with duration between 0.01 and 90cycle. The simulation results depict the characteristics of the lamp about operating limits during voltage sag by the magnitude and duration of sag in CBEMA curve.