• Journal of Advanced Marine Engineering and Technology
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• v.35 no.8
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• pp.1111-1116
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• 2011

Power distribution systems onboard vessels are typically configured without any live line connected to hulls for earthing purpose, where the line to hull voltages are affected and deformed depending on the impedances consisting of insulation resistances and distributed capacitances between power lines and hull. An insulation fault at power lines causes the line to hull voltages to increase to a higher level which brings more possibilities to electric shock and deterioration of insulation material. This study focuses on how to configure a module which enables to continuously monitor the voltages between power line and hull based on the vector diagram by analyzing the neutral point of 3 phase voltages and the algorithm for plotting method on the PC monitors.

• Journal of IKEEE
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• v.23 no.1
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• pp.318-321
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• 2019

The apparent soil resistivity is used for estimating multilayer soil parameters, such as, layer's depth and soil resistivity. The apparent soil resistivity can be measured, and also can be calculated if soil parameters are given, becacuse the apparent soil resistivity is a function of these parameters. Therefore, any optimization algorithms can be used to find these parameters which make the calculated apparent soil resistivity close to the measured one. The equation for calculating the apparent soil resistivity is complicated and time consumed, because it is composed of an infinite integral which includes a zero order Bessel's function of the first kind. In this paper, a fast algorithm for calculating the apparent soil resistivity of horizontal multilayer earth structure has been presented using complex image method.

• Journal of the Korea Convergence Society
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• v.8 no.5
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• pp.275-285
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• 2017

The architectural site exists in the context of the surrounding environment as the background of architectural design, and the architecture exists in the connection between the site and the surrounding environment therefore, the plan of the building starts from the analysis of the site, and its consequences too meaning can be found in the relation with the surrounding environment. Ironically, however, there are no direct papers describing site analysis with this meaning. Therefore, this paper categorizes the site analysis items around the four environments of Land, Water, Fire, and Wind that constitute the environment of the ecosystem, furthermore, in order to apply the result of the fusion information to the architectural design by synthesizing the organic correlation between the inside and the surrounding environment, i created the '9sectors system', which is a combination of 'horizontal 3 and vertical 3' to provide a more rational and efficient architectural plan. Through the progress of the project using this system, it is considered that it is a more applicable method of the site analysis data than the existing site analysis method.

• Proceedings of the KIEE Conference
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• 2009.04a
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• pp.80-83
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• 2009

현장 대지구조의 측정과 분석은 정확하고 신뢰성 있는 접지시스템의 설계와 시공에 매우 중요하며, 특히 대지 구조의 분석은 접지방식의 선정과 시공에 있어 절대적인 요소이다. 현장 측정 대지저항률의 실제적 분석을 통해 더 정확한 접지설계와 접지의 효율성을 높일 수 있으며, 시공 후 접지성능의 설계 오차를 최소화할 수 있게 된다. 대지는 다양한 형태의 지층과 구조로 이루어져 있으며, 접지설계의 신뢰성과 정확성은 대지 조건을 얼마나 현장 지질 조건에 가깝게 모델링 하는가에 달려있다. 현장 대지구조 및 지질 특성에 가깝게 분석하여 적용된 접지 설계는 시공 오류의 최소화, 성능의 안정화 그리고 비용의 절감은 물론 운용 설비의 운용 품질을 높여 주게 된다. 본 연구에서는 현장에서 측정된 대지저항률을 수직 지층와 수평지층 구조로 분석하여 그 결과를 비교하였고, 분석된 각각의 구조 대지저항률을 적용하여 접지시스템을 설계 비교하였다. 또한 설계된 접지시스템을 현장에 시공하여 측정된 결과값을 수직구조의 접지 설계치와 수평구조의 접지 설계치를 비교하므로써, 이를 통해 대지구조의 유형분석에 따른 접지설계의 신뢰성과 오류를 최소화하기 분석방안을 제시하였다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.21 no.1
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• pp.142-147
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• 2007

This paper presents the distributions of ground surface potential rises as functions of soil structure and buried depth of ground rod. To propose fundamental data relevant to the reduction of electric shock of human beings due to ground surface rise, the ground surface potential rises near the ground rod were computed and measured. Ground surface potential rises near ground rod strongly depend on the soil structure, and an increase of the buried depth of ground rod results in a decrease of the ground surface potentials. The maximum ground surface potential appeared at the just above point of ground rod. Also, the measured results were in reasonably agreement with the data computered by grounding analysis program.

• Journal of Advanced Marine Engineering and Technology
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• v.35 no.8
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• pp.1117-1123
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• 2011

Ungrounded power systems are adopted onboard vessels which enable more stabilized power supply even in case of electric leakage to hull. If earthing faults happen at these systems, they make grounding impedances of power lines unbalanced each other on the three phases, resulting in high voltages to hull which can bring more possibilities of electric shocks and electric fires. This study focuses on how to configure a calculation module for transferring a grounded condition by lowered insulation resistance into a vector diagram of the voltages to hull. By using the module, the loci of neutral points were acquired to analyze how voltages to hull are affected by earthing faults and the distributed capacitances between power lines and hull. The suggested module was simulated and compared to the measured values from a test power system in good results.

• Annual Conference of KIPS
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• 2003.05b
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• pp.867-870
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• 2003

현재 한국과 일본은 실제 대지선을 디지털 맵으로 정비되어 있지 않은 상황에 따라 실 대지선에 대한 근접한 이론적 대지 선을 산출 및 작도하여 시가지 분석에 조력의 역할을 도모하게 하는 것을 목적으로 본 연구를 수행하였다. 도로와 건물간의 관계와 건물과 건물간의 위상관계를 감안하고 GIS 기술을 적용하여 이론 대지면적을 추출하고 실제측량에 의한 실제 대지와의 차의 정도를 파악하여 시가지 공간분석에 있어서의 필수 불가결한 평면적인 토지이용상황을 나타내는 지표인 건폐율을 산출하는데 필수 불가결한 대지면적산출의 정합성을 증명하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2014.10a
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• pp.197-198
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• 2014

여가시간 및 소득수준 증가에 따라 다양한 활동들이 수상공간에서 일어나고 있으며 이를 수용하기 위하여 다양한 구조물들이 수상에 설치되고 있다. 그 중 플로팅 건축물은 친환경적이고 수상공간을 보다 적극적으로 활용할 수 있다는 이유로 최근 그 사용이 증가하고 있다. 하지만 부유체를 이용하여 수상에 입지하는 플로팅 건축물의 특성으로 인하여 기능, 용도 및 이용목적이 일반건축물과 동일하나 법적으로 다르게 취급되고 있으며 플로팅 건축물의 설계, 건설 및 이용 과정에서 다양한 문제가 발생되고 있다. 이러한 문제들은 최근 수요가 증가하고 있는 플로팅 건축물 활성화에 많은 제약이 되고 있다. 따라서 플로팅 건축물을 일반건축물과 같은 '건축물'로서 법적 지위를 인정받기 위해서는 "건축법"에서 정의하고 있는 '건축물' 및 '대지'에 대한 개념을 바탕으로 플로팅 건축물이 설치되는 수상공간에 대한 수상대지에 대한 개념 설정이 시급한 실정이다. 본 연구에서는 국내외 플로팅 건축물 법적용 사례를 바탕으로 일반건축물에 적용되는 대지의 개념으로 인하여 발생되는 플로팅 건축물의 법적 문제를 도출하고 이를 해결하기 위한 수상대지 개념 설정에 대한 방안을 모색하였다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.24 no.5
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• pp.114-121
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• 2010

This paper deals with the frequency-dependent grounding impedances of counterpoises relevant to the soil resistivity, the length of counterpoises and the feeding point of test current. The grounding impedances of counterpoises buried in one-layered and two-layered soils were measured and analyzed in the frequency range from 1[kHz] to 10[MHz]. As a result, the frequency-dependent grounding impedances strongly depend on the soil resistivity, and the grounding impedances within the frequency of several tens [kHz] are capacitive behavior in high soil resistivity. When injecting the ground current to the end of counterpoise buried in soil with high resistivity, the grounding impedances in high frequency are increased.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.19 no.6
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• pp.65-71
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• 2019

Conventional methods of measuring ground resistance and ground resistance field measurement are used to measure voltage drop according to the resistance value of the site by applying current by installing a constant interval of measurement electrode. If the stratified structure of the site site is unique, errors in boundary conditions will occur in the event of back acid and the analysis of the critical ground resistance in the ground design will show much difference from simulation. This study utilizes the Arduino module and smart ground measurement technology in the convergent information and communication environment to develop a reliable smart land resistance measuring device even if the top layer of land is unique, to analyze the land resistance and accumulate data to predict the change in the age of the land. Considering the topographical characteristics of the site, we propose a ground resistance measuring device and its method of measuring ground resistance so that the auxiliary electrode can be installed by correctly positioning the angle and distance in measuring ground resistance. Not only is ground resistance value obtained through electrodes installed to allow accurate ground resistance values to be selected, but it can also be used as a useful material for installing electrical facilities in similar areas. Moreover, by utilizing reliable data and analyzing the large sections of the site, a precise analysis of the site, which is important in ground design as well as construction cost, is expected to be used much in ground facility design such as potential rise.