• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2004.07a
• /
• pp.507-510
• /
• 2004

염해지역 배전선로의 나선 사용에 따른 안전사고방지 및 전력공급신뢰도 향상을 위하여 경동선 도체에 수밀 컴파운드를 충진하고 흑색의 가교폴리에틸렌으로 압출한 절연전선으로 염해지역의 특별고압 가공전선로에 사용하며 내부식성, 수밀성 및 전기 특성이 우수하다. 따라서 본 평가기술에서는 내트래킹, 인장강도, 우수침입방지성, 침적성, 통전내부식성, 교류파괴전압, 박리성, 밀착도 등의 주요한 시험에 대한 시험방법을 검토하고, 시험에 적용하여 시험 시 문제점을 도출하고 시험방법을 정립하고자 한다.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2008.11a
• /
• pp.529-532
• /
• 2008

The durability of concrete and the water-tightness properties of cementitous material are closely relation. So, water-tightness materials as natural minerals, organic fatty acid, organic fatty salts inorganic materials use for improvement of concrete durability. But these materials are somehow different in water-tightness mechanism. In this study, we studied on hydration properties and water-tightness properties of cementitous materials with zinc-stearate, a kind of organic fatty acid salts.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2005.07a
• /
• pp.227-228
• /
• 2005

사용중인 OC의 사고가 외물접촉, 자연현상, 일반인 과실 등으로 인하여 전체 배전선로 일시고장의 대부분을 차지하고 있음으로, 피복의 트래킹 성능을 개선하여 수목 및 조류와의 접촉으로 인한 접촉부 전개 집중 시 또는 지지금구의 바인더부에 고전계 인가 시 트래킹에 의한 절연물의 탄화, 침식 등에 의하여 발생할 수 있는 절연파괴 등의 사고 위험을 줄이기 위하여 개발된 제품으로 산악지역 등에서 내트래킹, 내부식성, 수밀성 및 전기적인 특성이 우수하다. 본 평가기술에서는 알루미늄 묘|복강선, 연선 및 절연체의 일반적인 특성과 트래킹성, 도체수밀, 내후성, 밀착도, 교류파괴전압 등의 주요한 평가시험에 대한 방법을 검토하여 평가시험에 적용하여 평가시험시 문제점을 도출하고 평가시험방법을 정립하고자 한다.

• NEWSLETTER 전기공업
• /
• no.94-6 s.103
• /
• pp.34-38
• /
• 1994

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.20 no.6
• /
• pp.37-48
• /
• 2006

• Magazine of the Korea Concrete Institute
• /
• v.17 no.3 s.86
• /
• pp.50-53
• /
• 2005

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2016.05a
• /
• pp.93-95
• /
• 2016

In recent years, attention of ship owners for the energy saving of the vessel is being collected due to the volume decline. Ship accommodation consists of watertight type windows and is closed, Ship HVAC is used to promote a comfortable environment for the crew. In addition requirements for comfort of the crew is getting stronger with the improvement of living standards, there is a need for HVAC improvements. In this paper, propose method to save energy and improve HVAC controls by using the HVAC structure of the variable air volume.

• Transactions of the Korean Society of Mechanical Engineers
• /
• v.16 no.12
• /
• pp.2376-2384
• /
• 1992

A theoretical analysis is carried out to predict the characteristics of transient ignition phenomena for the spherical fuel droplets cloud with non-uniform droplet size and number density distribution. Numerical calculations are performed for various cases depending on the combinations of the major parameters such as ambient temperature and initial distributions of droplet size and number density. The results of present study show that the ignition delay decreases for higher ambient temperature and smaller droplet size. Droplets cloud of hollow type with outer concentrated distribution ignites most rapidly.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• v.y2004m10
• /
• pp.1-6
• /
• 2004

We ensure a flat and regular basic surface by using part of joint waterproofing improved sheet method applying the upper slab of a concrete structure. We solve the problem of getting loose scale the general sheet by waterproofing of the sheet and improving adhesive strength of the basic concrete. Also, waterproofing sheet union to problem of joint have solved using of insertion type method so that, it improved a watertightness. It has improved in resist impact, resist abrasion and it is the effect of shortened construction period and cutting down on construction expenses. Here are the special quality and superiority of this waterproofing research. (1) Level material has the super adhesive strength so that it makes the basic surface without the gab of waterproofing sheet and waterproofing layer with the string adhesive strength. (2) We unite the sheet with the joining part between sheets by waterproofing sheet joint using of method. (3) There is the effect of shortened construction period and cutting down on construction expenses without waterproofing of protection.

• Proceedings of the KIEE Conference
• /
• 2000.07c
• /
• pp.2020-2022
• /
• 2000

The cross-linked polyethylene(herein after XLPE) insulated power cable emit the methane($CH_4$)gas in the course of chemical cross-linking process. The general stranded conductor easily discharge this methane gas through the gap of each stranded wires. But the special stranded conductor that filled with semi-conducting rubber compound to prevent water penetration which is applied to water proof type of cable(22.9kV CN/CV-W), disturb the methane gas emission. The pre-mold type cable joint shall be expanded gradually by emit of gas left in XLPE insulation. For example, sometimes the corona problem outbreak on a new power distribution line, resulted from the gap between the sleeve and semi-conductive layer of cable joint. If above mentioned problem especially happened on the way of operating. We have to shut down the line and try to discharge the methane gas in cable joint. In this point, we would like to explain the mechanism of methane gas & cable joint and our test result briefly. At last, we are pleased to introduce the solution for preventing reoccurrence of this problem.