• Journal of Digital Convergence
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• v.16 no.10
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• pp.415-420
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• 2018

This study focused on the designs for the pulley and electric cables for Hello, the artwork displayed at the Great Hall at the Incheon International AirportTerminal 2. This study presented designs for the pulley and cables, and the parts were applied and tested to analyze their durability and problems. Improvements were made for the final production of the work and three samples were produced respectively for the designs of the pulley and the cables. As are sult, this study found that for the pulley, the most efficient design was to fix the cables at its center. In the case of cables, it was most efficient touse flat cables with a wire in the core. These designs were applied to the artwork Hello, which is currently installed at the Great Hall at the Incheon International Airport Terminal 2. Future research will be conducted to make further improvements to the cable sand the pulley.

• Journal of the Korean Society for information Management
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• v.34 no.1
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• pp.177-195
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• 2017

This study attempts to infer research fronts using factor graph model based on heterogeneous features. The model suggested by this study infers research fronts having documents with the potential to be cited multiple times in the future. To this end, the documents are represented by bibliographic, network, and content features. Bibliographic features contain bibliographic information such as the number of authors, the number of institutions to which the authors belong, proceedings, the number of keywords the authors provide, funds, the number of references, the number of pages, and the journal impact factor. Network features include degree centrality, betweenness, and closeness among the document network. Content features include keywords from the title and abstract using keyphrase extraction techniques. The model learns these features of a publication and infers whether the document would be an RF using sum-product algorithm and junction tree algorithm on a factor graph. We experimentally demonstrate that when predicting RFs, the FG predicted more densely connected documents than those predicted by RFs constructed using a traditional bibliometric approach. Our results also indicate that FG-predicted documents exhibit stronger degrees of centrality and betweenness among RFs.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.10a
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• pp.164-164
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• 2000

일반적으로 해양에서 전선이란 서로 다른 수괴간의 불연속면을 일컫는다. 이러한 전선의 양측 면에는 유속, 수온, 염분, 수질 등이 급변한다. 본 연구는 1997년 8월 26일부터 9월 2일까지 제주도 서부에서 중국 상해 양쯔강 하구역까지 21개 정점에서 관측된 물리ㆍ화학적 관측자료로부터 연안과 외양간의 수온, 염분, 밀도 등 물리적 인자 특성으로부터 전선역을 찾아내고 전선역을 중심으로 양측의 수질특성을 용존산소, 인산염, 질산염, 규산염 등 영양염류의 분포 특성과 아울러 생산력 인자인 엽록소 a의 분포량을 파악하여 전선역을 중심으로 한 수괴간의 특성을 규명하였다

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.2081_2082
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• 2009

국내 가공배전 선로는 절연전선을 사용하고 있으며, 절연을 위해 세라믹 재질과 폴리머 재질의 지지애가가 사용되고 있다. 지지 애자 위의 전선은 진동에 따라 종방향 및 횡방향의 기계적 마찰력을 받고 있으며, 전기적으로 누설전류 및 서지의 영향을 받아 절연피복이 손상된다. 본 연구에서는 지지애자를 통해 흐르는 누설전류에 의해 전선이 손상되는 메커니즘을 규명하여 고장을 예방하고자 하였다. 절연전선은 손상된 부위에서 전류가 집중되어 내부 도체가 용융 단선되었다. 전선단선에 영향을 주는 열화 인자로서 지지애자의 표면 열화상태, 절연전선 피복 손상, 바인드선의 종류 등이 복합적으로 작용하였다.

• The Journal of the Korea institute of electronic communication sciences
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• v.15 no.6
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• pp.1201-1208
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• 2020

A mass of seawater with similar properties in the ocean is called a water mass, and the front is a sea area where two masses of different properties meet. The gradient algorithm is a method of extracting where the sea water temperature pixel changes rapidly assuming that the slope is large, and the place with the large slope is assumed to be a front. This method is able to process large amounts of satellite data at once. Therefore, in this study, we tried to find the front lines in the sea area around the Korean Peninsula by using a gradient algorithm. The study data used gridded sea surface temperature satellite data. The resolution was 1/4°, and the monthly average data from January 1993 to December 2018 were used. There were major five fronts representatively, China Coastal Front, South Sea Coastal Front, Kuroshio Front/ Kuroshio Extension Front, Subpolar Front and the Subarctic Front. As a result of comparing the distribution of front by season, more types of front were distributed in winter and spring than in summer and autumn, and the distribution range was wider.

• 전기의세계
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• v.46 no.7
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• pp.72-74
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• 1997

1887년 우리나라에서 처음 전기를 사용하기 시작한 이래 초기에는 모든 송배전 선로의 전선은 수입에 의존해야 했으며, 가공 송배전이 주축을 이루었던 시절이었으나, 현재에는 전기에너지의 전달 수단으로써 전선은 꾸준한 발전을 이룩하여 국내에서 소요되는 전선량의 대부분을 국내 생산으로 충족하고 있는 실정이다. 우리나라 전선의 국산화는 1955년 국내 최초의 전선업체인 대한전선(주)이 설립되면서부터 시작되었으며, 그 이후 자체 연구개발 및 해외로부터의 기술도입에 박차를 가하게되고, 이를 계기로 송배전 선로의 지중화 즉, 케이블화가 시작된 것이다. 국내에 최초로 수입된 지중배전선로가 운전을 개시한 1929년 이후 40여년 만인 1970년에 국내 최초의 국산 지중배전선로가 포설, 운전하기에 이르렀고, 이렇게 축적된 기술을 기반으로 하여 1971년 수입 포설된지 불과 7년 후인 1978년 국내최초로 국산 초고압케이블이 개발.시공.운전하기에 이르렀다. 이로써 케이블 국산화는 가일층 증가 일로에 있었으며, 현재는 산업의 동맥으로써 중요한 역할을 담당하고 있다.

• 한국해양학회지
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• v.25 no.2
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• pp.84-95
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• 1990

Observations by CTD castings, moored current meters and satellite imageries reveal some physical characteristics of the area around the tidal mixing front found in the mid-Yellow Sea off Korea. Tidal mixing is the greatest at the promontory of Taean Peninsula with a front around it. The front appears in April with the start of solar heating, becomes most clear in August and disappears in November with the start of surface cooling. In the north of the front, tidal fluctuations of temperature and salinity induced by tidal currents manifest the existence of the front, Differently from the usual tidal mixing front, the front in Kyunggi Bay is formed by presence of the water discharged from the Han River which meets the offshore water at the front. Near the surface cold center, vertically well-mixed zone extends to about 50 Km offshore from the coast, Farther south, this structure is generally retained but with lesser degree of vertical mixing. Within the relatively well-fixed coastal zone, the fresh water discharged from the Kum River makes another salinity front of smaller extent. At some places around this salinity front, an Upwelling-like feature is remarked.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2009.05a
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• pp.376-379
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• 2009

본 논문에서는 다양한 사용목적을 가지고 물성적 특징의 변화 및 발전이 지속적으로 이루어지고 있는 고분자 유기소재의 응용범위를 중량과 기계적 강도면에서 우수한 유기전선으로 활용하기 위한 기초 연구로서 유기도전성 섬유인 아크릴-F의 전기적 특성을 분석하였다. 아크릴-F의 저항값을 길이와 단면적에 대하여 각각 6단계 또는 5단계로 변화시켜 측정하였으며, 기존의 구리전선의 저항값에 대하여 지수함수 2차항에 의한 특성비교를 수행하였다. 실험결과 아크릴-F는 일반 구리전선과 비교하여 저항값은 매우 높게 나타났지만 전선과 매우 유사한 저항 특성을 가지는 것을 확인하였다.

• Fire Science and Engineering
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• v.15 no.1
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• pp.108-115
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• 2001

In this paper, we analyzed the properties change of electric wire when the thermal stress was applied to 600V grade polyvinyl chloride insulated wire (IV). In the structure analysis, normal wire has the properties of direction on the surface, but in case of deteriorated wire at above $400^{\circ}c$, it formed the carbide, the crack and the crystal. The surface composition rate of normal wire was Cu : 100%, but the section composition of the deteriorated wire at $800^{\circ}c$ showed Cu : 78.89%, O : 21.11%. In result of analyzing the differential scanning calory of copper wire, the new reaction peak was observed on the deteriorated wire at above $700^{\circ}c$. In case of the deteriorated wire as $150^{\circ}c$ at the differential thermal analysis, an endothermic reaction appeared at $264^{\circ}c$ lower than the reactive point of normal wire. The occupation rate of oxygen according to the deterioration of copper wire is about 20% at $500^{\circ}c$.

• Fire Science and Engineering
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• v.18 no.3
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• pp.45-50
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• 2004

Thermal degradation of PVC which used for insulator of 600V vinyl insulated wire has been studied by thermo gravimetry analysis and accelerated thermal aging test. The activation energy using thermo gravimetry analysis was determined by the kinetic methods, such as Kissinger and Flynn-Wall-Ozawa. The activation energy was determined to from 89.29 kJ/mol to 111.39 kJ/mol in 600V PVC insulated wire and from 97.80 kJ/mol to 119.25 kJ/mol in 600v heat-resistant PVC insulated wire. And also, the activation energy through a long-term thermal aging test was calculated by using Arrhenius equation In the low temperature of 8$0^{\circ}C$, 9$0^{\circ}C$, 10$0^{\circ}C$. The results showed that 600V PVC insulated wire was 92.16 kJ/mol, and 600v heat-resistant PVC insulated wire was 97.52 kJ/mol. Consequently, the activation energy of 600V heat-resistant PVC insulated wire is larger than 600V PVC insulated wire. Therefore, it can be predicted that 600V heat-resistant PVC insulated wire has a long-term stability relatively.