• Proceedings of the Korean Radioactive Waste Society Conference
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• 2019.05a
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• pp.281-282
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• 2019

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2019.05a
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• pp.217-218
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• 2019

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2018.05a
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• pp.325-326
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• 2018

• Journal of Positioning, Navigation, and Timing
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• v.8 no.4
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• pp.215-223
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• 2019

This paper analyzes navigation performances of the Korean Positioning System (KPS) constellation with respect to the orbit parameters which fulfills the specification requirements. Specifically, the satellite configuration and navigation requirements of KPS are explained, and the daily mean horizontal dilution of precision (HDOP) and satellite visibility on KPS coverage are analyzed to confirm the adequate orbit parameters. However, due to orbital slot saturation, geostationary-orbit (GEO) satellites may not be allocated in the original orbit as specified in the KPS requirements. Therefore, in a spanned window of 4 degrees from the reference longitude the navigation performance of each GEO satellite orbit is investigated.

• Journal of Positioning, Navigation, and Timing
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• v.9 no.4
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• pp.327-336
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• 2020

This study presents signal availability of inter-operable global navigation satellite system (multi-GNSS) combined with future Korean Positioning System (KPS), specifically at geosynchronous orbit (GSO). The orbit of KPS, which is currently under conceptual feasibility study, is first introduced, and the grid points for evaluating space service volume (SSV) at GSO are generated. The signal observabilities are evaluated geometrically between those grid points and KPS/GNSS satellites. Then, analyzed are the visibility averaged over time/space and outage time to not access one or four signals. The reduction of maximum outage time induced by KPS are presented with different maximum off-boresight angles depending on L1/E1/B1 and L5/L3/E5a/B2 frequencies. Our numerical analysis shows that the SSV of multi-GNSS combined with KPS provides up to 7 additional signals and could provide continuous observation time (zero outage time) of more than four GNSS or KPS signals for 3.20-14.83% of SSV grid points at GSO. Especially at GSO above North/South America and Atlantic region, the introduction of KPS reduces the outage duration by up to 63 minutes with L1/E1/B1 frequency.

• Journal of the Korean Society for Precision Engineering
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• v.26 no.3
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• pp.19-24
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• 2009

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.2037_2038
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• 2009

공장 단독부하에 전력을 공급하고 있는 디젤발전소에서, 자여자 방식으로 적용된 여자시스템이, 부하변동이 심하여 전압동요가 빈번하게 발생하는 곳에서 적용하기에 부적합한 것으로 판명되었고, 이에 PMG(Permanent Magnet Generator)를 이용한 타여자 방식의 여자시스템으로 변경하여 정상화 시킨 정비사례임.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2019.05a
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• pp.317-318
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• 2019

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.300_301
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• 2009

765kV Transmission line is retained and operated by KEPCO(Korea Electric Power Corporation), and KPS(Korea Power Plant Service & Engineering) has been taking charge of maintenance service. KPS is doing characteristic maintenance and inspection for 765kV lines for example preventive patrol, routine patrol(every 6-month), and close inspection(every 5-year), This paper presents the optimum maintenance methods and the related standards for 765kV line. This result will use to stabilize of 765kV lines.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.2062-2064
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• 2008

○○양수 발전소에서 운전되고 있는 SFC에서 양수모드 운전시 간헐적으로(1회/1-3개월) 승속실패(승속실패 시점은 대략 정격속도(300RPM)의 10%인 30RPM 전,후) 사례가 발생하나 SFC 제어 창에는 Alarm이나 Trip 관련 경보가 전혀 발생되지 않는 등 비정상 운전임에도 불구하고 원인을 파악할 수 있는 관련 정보를 취득할 수 없는 상황에서 SFC를 포함하여, 관련되어 운전되는 AVR, 인터페이스 판넬 등에 대하여 정밀점검을 시행하고, 원인을 규명함과 동시에 정상화 시킨 진단 사례임.