• Proceedings of the KIEE Conference
• /
• 2001.05a
• /
• pp.266-269
• /
• 2001

컴퓨터 기술과 통신. 네트워크 기술의 발달로 전력설비의 보호방식은 단순한 보호 기능 외에 전체 시스템을 자동으로 보호. 제어하는 추세로 발전하게 되었다. 이러한 새로운 보호개념을 구축하기 위해서는 디지털형 보호계전기와 이를 네트워크로 엮는 통신 기술, 데이터를 취득 가공. 관리하는 데이터 처리 기술이 필수적이다. 본 논문에서는 변전소 자동화 시스템에 필수적인 디지털 보호계전기의 개발 사례와 변전소 자동화 시스템의 네트워크 구성 및 데이터처리 방법을 소개하고 있다.

• Journal of Energy Engineering
• /
• v.27 no.1
• /
• pp.51-58
• /
• 2018

In this paper, we reported that the influence of advanced functional mineral filler calcium carbonate ($CaCO_3$) extracted from oyster shell waste, which are rich mineral sources of $CaCO_3$. Oyster Shells, available in abundance, have no eminent use and are commonly regarded as waste. Their improper disposal causes a significant level of environmental concern and also results in a waste of natural resources. Recycling shell waste could potentially eliminate the disposal problem, and also turn an otherwise useless waste into high value added products. Oyster shell waste calcination process to produce pure lime (CaO) which have good anti-microbial property for waste water treatment and then focuses on its current applications to treat the coffee waste and its effluents for biological treatment and utilization as a fertilizers.

• Journal of Energy Engineering
• /
• v.27 no.1
• /
• pp.59-64
• /
• 2018

In this paper, we investigated the alternative sources of limestone. Oyster shell waste originated from aquaculture that causes a major disposal landfill problem in coastal sectors in southeast Korea. Their inadequate disposal causes a significant environmental problems araised. Bio mineralization leads to the formation of oyster shells and consists $CaCO_3$ as a major phase with a small amount of organic matter. It is a good alternative material source instead of natural lime stone. The utilization of oyster shell waste for industrial applications instead of natural limestone is major advantage for conservation of natural limestone. The present work describes the limestone and oyster shells hydraulic activity and chemical composition and characteristics are most similar for utilization of oyster shell waste instead of natural limestone.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
• /
• 2008.10a
• /
• pp.1-10
• /
• 2008

• 한국정보디스플레이학회:학술대회논문집
• /
• 2005.07a
• /
• pp.330-333
• /
• 2005

We investigated the liquid crystal (LC) alignment phenomena using a-C:H and a-C:F:H thin films. Homogeneous alignment is obtained using ion beam treated hydrogenated amorphous carbon (a-C:H) thin films. Homeotropic alignment is obtained using F treated a-C:H thin films, namely, fluorinated amorphous carbon (a-C:F:H) thin films. We investigated the relationship between the surface properties of amorphous carbon based alignment layer and LC alignment phenomena.

• Special Issue of the Society of Naval Architects of Korea
• /
• 2005.06a
• /
• pp.206-210
• /
• 2005

As design trends has changed to have flexible aft hull structure, increased power output and stiffer shafting system, owners and classification societies have more concerned about shaft alignment. In the shaft alignment analysis, there are many uncertainties which are related in propeller generated force, bearing stiffness, crank shaft model and etc. in this study, it is focused on the effect of crankshaft model by comparing between equivalent model and actual crankshaft model.

• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.62 no.6
• /
• pp.863-869
• /
• 2013

In this paper, we compared and analyzed for safety 1.2m rectangular anchor block and arch-type root anchor block. First, numerical analysis was performed three-dimensional nonlinear method by numerical model test using finite element analysis program "Visual FEA". Then, measure displacement of the surface of the earth after construct each anchor block at 14M electric pole and increase loads through field verification tests for safety evaluation.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2007.08a
• /
• pp.597-600
• /
• 2007

The address and sustain discharge characteristics in plasma display panels (PDPs) are investigated and compared by the optical emission spectroscopy using the ICCD and Vt close-curve analysis. The observations on the xenon (Xe) emission show that the spatial and temporal evolutions in the first sustain discharge are quite different from those in the address and the other sustain discharges. The striation found in the conventional sustain discharge doesn't occur in the first sustain discharge. These different discharge behaviors are explained by employing the Vt close-curve.

• 한국IT서비스학회:학술대회논문집
• /
• 2008.05a
• /
• pp.118-122
• /
• 2008

본 논문에서는 이동통신 서비스에 시멘틱 웹 기술을 적용하여 지능형 위치기반 서비스를 제공할 수 있는 시스템 개발에 관한 연구를 기술하였다. 본 연구에서 기술되는 온톨로지 데이터베이스는 지역검색에서 사용자 질의가 많은 14분야의 온톨로지를 구축하여 지능적인 모바일 지역 검색 서비스가 가능하도록 구성하였으며 실제 서비스에 적용하여 그 효과를 입증하였다.

• Proceedings of the KIEE Conference
• /
• 2003.07d
• /
• pp.2028-2030
• /
• 2003

This paper describes the results of reliability prediction analysis of control rod control system, which is being developed as part of KNICS project. The results of reliability prediction indicate MTBF(Mean Time Between Failure) of cards for control rod control system. A purpose of reliability prediction is to evaluate MTBF of cards, identify the design drawbacks of cards, and propose design improvement to a designer to help design the more reliable control rod control system. This reliability prediction analysis used the the part count and part stress method in the basis of MIL-HDBK-217F.