• 전기학회논문지
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• 제66권1호
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• pp.194-202
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• 2017

In this study, we measured and analyzed electrical noise signals present in devices and systems operated in industrial facilities. Based on the analytic findings, we studied the most effective improvement measures for eliminating such noise signals. Leakage current and ground current generate data interferences in communication systems, and therefore we measured leakage current and ground current. We also measured and analyzed electrical noises in power systems to predict noise pathways and interference routes. Furthermore, we proposed the most effective and reliable improvement measures for blocking off various noise signals and safely eliminating them by improving the internal wiring of the facilities and grounding systems. As a final step, we conducted the proposed improvement measures and confirmed that they helped to improve the operations of the device sand systems in service by re-measuring electrical noise signals and comparing them with those measured before the proposed improvement measures were implemented.

• KIEAE Journal
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• 제8권1호
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• pp.71-79
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• 2008

Lower birth rate and higher elder people are serious social problem in Korea. In 2003, the total birth rate is 1.19 per person, that record is lowest among OECD country. In 2005, Korea has been the aging society with 9.0% in aged population rate. Increasing of aged population results in elder estrangement and confliction with other generations. The social problem can be solved in some degree by improving housing environment and many kinds of welfare program. This study suggests a solution of the problem by applying community space located on ground level floor. The ground level floor of apartment has many physical benefits like connection to the earth, extension, safeness for the aged and child. in case of the National Rental apartment, small residential area and high rate of elder, child, the disabled make the ground level floor useful space for community. According to case study, almost the National Rental apartment hasn't enough facilities supporting various generations and don't supply comfortable environment. So, this study presents how to design the National Rental Apartment's community space located on ground level floor.

• 한국가스학회지
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• 제27권4호
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• pp.34-42
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• 2023

산업시설이 국가 경제에 기여하는 바를 고려할 때 지진에 대한 운전성 확보는 매우 중요하다. 그러나, 현행 내진설계의 기본 개념은 대규모 지진에 대해 주로 시설물의 연성거동을 허용하며 붕괴방지를 목적으로 구조적인 안전성만을 고려한다. 산업시설의 운전성 확보를 위해, 산업시설물의 구조거동 특성에 따라 운전성을 유지하기 위한 내진성능수준이 다양할 수 있으며, 이를 만족하기 위한 내진설계방법이 필요하다.본 연구에서는 평저형 저장탱크에 대한 비선형 응답이력 해석으로 비선형 지진거동 특성(R-μ-T)을 분석하고 이를 바탕으로 신뢰도 기반의 성능기반 내진설계 방법을 새롭게 제안하였다.

• 대한전기학회논문지:전력기술부문A
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• 제54권12호
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• pp.592-596
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• 2005

Recently, substations have been constructed in GIS (Gas Insulated Switchgear) and indoor type because of the increasing difficulties of securing locations. In case of urban substations, it is also common that the substations are exclusively fed by underground cables. Sometimes, the infrastructures in urban area, such as communication facilities, are located near substations to be constructed. In this paper, we examined such a case that a branch office building of KT(Korea Telecom) was located near 154 kV underground GIS substation under construction with about 100 meters of the lateral distance between two facilities. GPR (Ground Potential Rise) at the substation and the transferred earth potential at the KT building through the earth in SLG (Single-Line-to- Ground) fault condition were investigated based on a series of computer simulations. The calculated earth potential at a distance of 100 m from the substation was below 120 V which satisfying the limit value of 650 V.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 춘계학술대회논문집
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• pp.465-472
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• 2001

This paper describes the characteristics of wind induced noise from high-voltage overhead transmission facilities which include transmission lines. insulator strings. and aviation beacon spheres installed on the overhead ground wires. High-voltage overhead transmission lines generate an audible wind noise due to the alternate shedding of wind-induced vortices. The frequency spectrum from the insulator strings reveals its resonance peak. This resonance sound mechanism has been supposed the self-excitation phenomenon of the resonance and the velocity fluctuation. The booming noises from the aviation beacon spheres are detected and analysed.

• Asian Pacific Journal of Cancer Prevention
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• 제13권10호
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• pp.4861-4866
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• 2012

This is a review article which looks into details what the actual scenario of the problem of breast cancer in our country is. As the problem is on the rise, what is the level of the preparedness at our end to tackle the problem. The articles reviews the epidemiology of breast, high risk factors, detection, diagnosis and treatment facilities also along with that screening facilities and their ground reality, awareness of the women from different walks regarding various issues of breast cancer and what intervention can be made to combat the disease.

• Proceedings of the National Institute of Ecology of the Republic of Korea
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• 제2권4호
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• pp.298-304
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• 2021

This study aimed to determine the applicability of drones and air quality sensors in environmental monitoring of air pollutant emissions by developing and testing two new methods. The first method used orthoimagery for precise monitoring of pollutant-emitting facilities. The second method used atmospheric sensors for monitoring air pollutants in emissions. Results showed that ground sample distance could be established within 5 cm during the creation of orthoimagery for monitoring emissions, which allowed for detailed examination of facilities with naked eyes. For air quality monitoring, drones were flown on a fixed course and measured the air quality in point units, thus enabling mapping of air quality through spatial analysis. Sensors that could measure various substances were used during this process. Data on particulate matter were compared with data from the National Air Pollution Measurement Network to determine its future potential to leverage. However, technical development and applications for environmental monitoring of pollution-emitting facilities are still in their early stages. They could be limited by meteorological conditions and sensitivity of the sensor technology. This research is expected to provide guidelines for environmental monitoring of pollutant-emitting facilities using drones.

• 한국농촌건축학회논문집
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• 제17권1호
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• pp.113-120
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• 2015

In recent years, the population composition of rural area is changing due to the decreasing population growth of the aged with disability and people returning to farming. Since 1970's the rural community facilities have been spreaded out across most rural villages. Although the rural community facilities are the most widely used facilities, the existing facilities are need to be new built or remodeled according to demographic changes, usage of facilities, and environmental condition. Given this reality, the rural community facilities such as village assembly hall and nursing home for senior citizen are not only used for daily life place but also used like co-residence having meals and sleeping together. Therefore the rural community facilities have the potential to become welfare service space for rural elderly people. This research focuses on the current situation of universal design applied community facilities. According to the research, most of the village community facilities were built in the 1990s and 82% of the buildings were more than 15 years old. Furthermore, 45% of the village community facilities more than 15 years old most have a ground floor in masonry structure. The area of the building is 65% less than $100m^2$. The width of the access entrance, the height of the sink, gas safety valve and so forth were relatively well designed. However, the handrail of the entrance, space in front of the toilet bowl, the height difference between the entrance and floor, the installation of the width of the ramp and stair handrail was relatively incomplete. Village community facilities to be built in the future should be universal design fundamentally.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.104-106
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• 2004

There are many under grounds facilities like oil pipes, gas pipes, water pipes, oil tanks, etc. and severe corrosion of these facilities made big problems. Fire, wide area water and soil pollution, massive and hazardous explosion, etc. can make big problems and cause big economical loss. So, various technologies were developed to keep these undergrouns facilities safely, and cathodic protection is one of it. For cathodic protection, one must detect potential of pipes, and there are so many test box to check pipes potentials. In this thesis, we describe on the development of small size corrosion monitoring system that measure pipes potentials easily and economically.

• 한국디지털건축인테리어학회논문집
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• 제9권1호
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• pp.41-48
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• 2009

Entering the 21st century, countries throughout the world are turning the direction of their education to be consumer-oriented and reinforcing lifelong education in preparation for the rapid advance of science and technology and the globalization, opening and informatization of the world. With the reinforcement of consumer-oriented education and lifelong education, the role of school is emphasized as a ground for lifelong education in community and efforts are being made to use schools and community facilities compositely so that schools may play the role of central facilities in community. Accordingly, the objective of this study is to analyze the relation between lifelong education and school facilities in the educational aspect, and to suggest a basic architectural direction so that schools may play central roles for social, cultural, educational, welfare, and sport activities in community.