• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2002.11a
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• pp.361-365
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• 2002

Three types of the coupling structures in combline resonators are presented: magnetic, electric, and mixed coupling structures. The magnetic coupling structure is provided by the window, and the electric coupling is provided by the electric probe. The mixed coupling structure which is the superposition of the magnetic and electric coupling structures, is proposed for the electric coupling in combline resonators with easy tuning capability. The responses of each coupling structure are shown. A 4-pole combline filter is designed and fabricated as an application of those coupling structures, and shows good filter responses.

• Proceedings of the KAIS Fall Conference
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• 2006.05a
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• pp.302-306
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• 2006

In this study, we analyzed the influence of electrical pole by FEM(Finite Element Method) and developed protective system by designing and interpreting protective system for electrical pole when abnormal strength worked on messenger wire. Protective system did not shed messenger wire under wind pressure and discontent load but did assign a part to preventing rupture of electrical pole through automatically shed messenger wire over fixed strength. Structure of protective system analysis by FEM and prove property by measuring tensile strength for practical product.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.67 no.8
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• pp.1040-1046
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• 2018

The Permanent Magnet Synchronous Motor(PMSM) has various advantages. However, new types of research have been carried out because of rising prices of materials for rare earth magnets used in PMSM and also unstable supply. In this paper, we propose Consequent Pole(CP) type IPMSM for magnet reduction. The shape of CP type IPMSM stator was same with Basic model IPMSM. The design of the rotor shape was proceeded that CP type IPMSM achieved the same output as the basic model IPMSM. Finally, the selected model and IPMSM were compared and discussed.

• Proceedings of the KIEE Conference
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• 2003.07a
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• pp.290-292
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• 2003

The intake tower of D-dam located in a mountainous area positioned in the left side of the dam and its structure installed alone on the water surface then, can become target of direct lightening. To protect the intake tower from the direct lightening and indirect-lightening, lightening rod installed in the top area of the intake tower and ground pole laid under the surrounding ground. however, because the surrounding ground almost consists of a rock, it is very difficult to obtain the grounding resistance. It is main object to examine the construction plan of the optimum lightening rod equipment and ground pole with measuring the earth specific resistance of the around of the intake tower which is the scheduled area to lay the ground pole with the Wenner's 4-electric pole method and the Schlumberger's method. and using the analysis tool, ESII.

• Proceedings of the KIPE Conference
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• 2007.07a
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• pp.418-420
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• 2007

When the magnetic levitation system(MAGLEV) initially rise, The MAGLEV has a weak point that is very large variation of the electric current. In this paper, The author applied the multi-loop-control to stably control the magnetic levitation system(MAGLEV). The gains of the control algorithm were selected based on pole locations formulated from a prototype Bessel transfer function model. The design incorporate tradeoffs in DC-to-DC converter hard-ware para-meters and pole locations. In order to confirm the superiority of the proposed pole selection and controller, MATLAB simulation and experiment results are presented.

• JOURNAL OF ELECTRICAL WORLD
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• no.10 s.118
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• pp.58-61
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• 1986

• JOURNAL OF ELECTRICAL WORLD
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• no.12 s.120
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• pp.47-51
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• 1986

• JOURNAL OF ELECTRICAL WORLD
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• no.11 s.119
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• pp.68-72
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• 1986

• JOURNAL OF ELECTRICAL WORLD
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• no.9 s.117
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• pp.56-61
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• 1986

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.24 no.8
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• pp.62-69
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• 2010

Many electric poles in the softground have been collapsed due to external load. In this study, 10 types of tests were performed with variation of location, numbers and depths of anchor blocks as well as depth of poles to find horizontal earth pressure through full scale pull-out tests. The horizontal earth pressure increased with embedded depth of electric pole, and earth pressure of lower passive zone decreased. The deeper of anchor block, earth pressure of passive zone becomes less. 4 anchor blocks decreased earth pressure at G.L.-0.9[m]. It is considered that 4 anchor blocks installed along 80[cm] vertically are main reason. Overall, when more anchor blocks are constructed, excavation area is large, and constructivity such as backfill is bad, therefore one anchor block would be preferred.