• Proceedings of the KIEE Conference
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• summer
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• pp.506-508
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• 2004

본 연구의 목적은 환경변화의 영향으로 최대풍속이 증가된 상황에서 가공배전선로의 선간단락고장을 최소화할 수 있도록 배전선로의 완철길이별 최대경간을 설정하는 방법을 개발하는데 있다. 따라서 가공배전선로 수평선간거리 계산식 및 선간거리별 최대이도 계산식을 개발하였고 이를 적용하여 알루미늄피복 강심 알루미늄 절연전선(ACSR/AW-OC)의 완철길이별 최대이도를 산정하였으며, ACSR/AW-OC 160mm^2을 기준이도로 시설시 완철길이별 최대경간과 최악조건 및 EDS(Every Day Stress) 하중조건을 고려한 전선이 도로 시설시의 최대경간을 도출하였다.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.36 no.4
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• pp.287-298
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• 2000

The charge of distance and the change of tack between paired boats were measured by ship's distance measuring system fixed MCS in the main boat and MS in the following boat. The operating depth of the anchovy boat seine was recorded and analysed by self memory temperature/depth sensor in order to compare the relationship between the distance between towing boats and geometry of the anchovy boat seine net. The results are as follow, (1) When distance between paired boat was 5m, the fishing net was spreaded down deeply and unstably in accordance with bag net and flapper may be help to pass out anchovy school. (2) When distance between paired boat was 100m, vertical opening of the net was gradually increased with higher slope of towing depth in the square, bosom and flapper. Therefore, fishing efficiency could be decreased by preventing the entering of anchovy due to unstable shape of the bag net. (3) When distance between paired boat was 200m, the geometry of the anchovy seine was stable condition with the end of bag net was up while flapper was down and it may cause bad effect in fishing efficiency. (4) When distance between paired boat was 300m, the shape from wing net to bag net was gradually slow down and stable enough as well as good shape in bag net and flapper. (5) The ship's distance measuring system could be used for measurement and accurate control of distance between paired boat in accordance of anchovy recordings by fish finder in order to get higher fishing efficiency in anchory boat seine operation.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2008.05a
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• pp.369-373
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• 2008

This case analyze the point of trouble and reform processing construction on input design to resolve the problem for setting tower in front of narrow base at the 154kV OO Transmission Line substaion. Hereafter the input design are presented for the basic reference data which the case a point of trouble and reform contents, input design of special shape tower and the foundation on substation input design cannot be setted by standard type of tower because of narrow base and cannot keep clerance overhead transmission conductor input to the substion.

• Proceedings of the KIEE Conference
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• 2005.07e
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• pp.25-27
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• 2005

본 연구의 목적은 환경변화의 영향으로 증가된 풍압에 대하여 선간단락고장을 예방할 수 있는 시설기준의 정립에 있다. 본 연구에서는 증가된 풍압 대비 특고압 ACSR/AW-OC(알루미늄피복 강심 알루미늄 절연전선)의 전 규격에 대한 선간거리별 최대이도를 계산하였고, 풍압지역별 임계경간 및 적용하중조건, 표를 고안하였으며, 이를 이용하여 기준이도 및 지역별 하중조건 적용 시의 최대경간을 최종적으로 도출하여 표로 고안하여 가공배전선로 설계자가 설계경간에 따라 적정 완철길이 및 전선이도를 결정할 수 있도록 하였다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.309_310
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• 2009

본 연구에서는 가공배전선로의 상하단 단락고장을 예방하기 위하여 현행 관련 기준의 적정성 여부를 검토하고자 한다. 이를 위하여 기준이도, 완철의 최소 이격거리, 미국 NESC(National Electric Safety Code)의 수직선간이격거리에 대하여 문헌적 고찰을 한 후, 이를 토대로 국내에 적용할 수직선간이격거리 및 지상고 검토 조건을 도출하였고, 기준이도 적용 시 가공배전선 종류별 75^{\circ}C$이도를 계산하여 그 결과들을 비교 검토하였다. 그 결과 상하단 선간단락 고장을 예방하기 위하여 나전선의 기준이도를 특고압전선과 동일하게 적용하여야 하며, 특고압 완철 간의 최소이격거리는 경간 100m 이상에서 수직이격거리가 부족하므로 0.1m 정도 증가 시키는 것이 바람직하다는 것을 발견하였다.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.37 no.4
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• pp.257-266
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• 2001

It was set up MCS and MS of ship's distance measuring system in land and ship respectively and ship's track including dropped and hove up anchor was tracked by mean of measurement for ship's position, relative bearing and distance from MCS to MS. Results analyzed for possibility of real time anchoring watch and effectiveness of measuring position are as follow; (1) The elapsed time from dropped anchor to hove up anchor is 4 minutes and the elapsed time to start recording ship's track after set up anchoring state is 10 minutes approximately. (2) Shape of hull's swing during anchoring is mostly 8 figue-like or rarely peanut-like shape. (3) Mean anchoring position during whole measuring time was shifted 49m north and 89m eastly. (4) Ship's track were moved counter-clockwise for $8.1^\circ$ range from relative bearing $186.1^\circ$ to $194.2^\circ$ ellipse-like tracks with the major axis 63m and the minor axis 53m. (5) High frequency of ship's position distribution was shown at relative bearing $187^\circ$ and distance 558m while low frequency was shown at relative bearing $194^\circ$ and distance 556m. (6) The designed ship's distance measuring system by PRTK-GPS was fit very well for anchoring watch as secured necessary area demanded for dragging anchor as well as anchoring by means of real time measurement both in distance and bearing.

• Journal of the Korean Society for Precision Engineering
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• v.26 no.8
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• pp.72-78
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• 2009

We developed a line standards measurement system using an optical microscope and measured two kinds of line standards. It consists of three main parts: an optical microscope module including a CCD camera, a stage system with a linear encoder, and a measurement program for a microscopic image processing. The magnification of microscope part was calibrated using one-dimensional gratings and the angular motion of stage was measured to estimate the Abbe error. The threshold level in line width measurement was determined by comparing with certified values of a line width reference specimen, and its validity was proved through the measurement of another line width specimen. The expanded uncertainty (k=2) was about 100 nm in the measurements of $1{\mu}m{\sim}10{\mu}m$ line width. In the comparison results of line spacing measurement, two kinds of values were coincide within the expanded uncertainty, which were obtained by the one-dimensional measuring machine in KRISS and the line standards measurement system. The expanded uncertainty (k=2) in the line spacing measurement was estimated as $\sqrt{(0.098{\mu}m)^2+(1.8{\times}10^{-4}{\times}L)^2}$. Therefore, it will be applied effectively to the calibration of line standards, such as line width and line spacing, with the expanded uncertainty of several hundreds nanometer.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2002.10a
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• pp.61-62
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• 2002

본 연구는 전보에서 개발한 RTX에 대한 응용 연구의 하나로써 레이더 영상 신호의 수록 및 해석에 부가하여 타선의 GPS 위치정보를 수신하여 자선의 전자해도(ENC) 및 radar 화면상에서 동시에 표시함으로써 이들 두 선박의 간격을 측정할 수 있는 선간거리계, 또한, 타선의 ARPA radar가 탐지한 영상신호, 타선의 기동정보(own ship data, OSD) 및 추적표적의 정보(tracked target message, TTM) 등을 자선의 레이더나 전자해도 화면상에서 실시간으로 모니터링하는 software를 개발하고, 이들의 레이더 정보를 필요에 따라 hard disk에 수록 및 재생할 수 있는 아주 간편하면서도 범용성이 있는 레이더 정보수록 및 해석 시스템을 개발하였다. (중략)

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.51 no.9
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• pp.467-473
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• 2002

In this paper, a fault location algorithm is suggested for line to line faults in distribution networks. Conventional fault location algorithms use the symmetrical component transformation, a very useful tool for transmission network analysis. However, its application is restricted to balanced network only. Distribution networks are, in general, operated in unbalanced manners, therefore, conventional methods cannot be applied directly, which is the reason why there are few research results on fault location in distribution networks. Especially, the line to line fault is considered as a more difficult subject. The proposed algorithm uses direct 3-phase circuit analysis, which means it can be applied not only to balanced networks but also to unbalanced networks like distribution a network. The comparisons of simulation results between one of conventional methods and the suggested method are presented to show its effectiveness and accuracy.

• Proceedings of the KIEE Conference
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• 2002.07a
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• pp.108-110
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• 2002

In this paper, a fault location algorithm is suggested for line to line faults in distribution networks. Conventional fault location algorithms use the symmetrical component transformation, a very useful tool for transmission network analysis. However, its application is restricted to balanced network only. Distribution networks are, in general, operated in unbalanced manners, therefore, conventional methods cannot be applied directly, which is the reason why there are few research results on fault location in distribution networks. Especially, the line to line fault is considered as a more difficult subject. The proposed algorithm uses direct 3-phase circuit analysis, which means it can be applied not only to balanced networks but also to unbalanced networks like distribution a network. The comparisons of simulation results between one of conventional methods and the suggested method are presented to show its effectiveness and accuracy.