• Title, Summary, Keyword: low-maintenance

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The Comparison of Maintenance Cost and Residents′Consciousness of Remodeling by Rental Apartment Types (임대아파트 유형별 유지관리비와 거주자의 리모델링 의식비교)

  • 박민용;장승재
    • Journal of the Korean housing association
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    • v.14 no.4
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    • pp.69-76
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    • 2003
  • Considering the present development situation of rental apartment since 1982, the supply of rental housing for low-income dwellers has contributed a amount of quantities, but has been deficient qualities in housing policy. To propose the device of remodeling for low-income dwellers in deteriorated apartment, this study investigated the characteristics of maintenance cost and the residents'consciousness of remodeling by rental apartment types. The results of this study were as follows; The annual maintenance cost of permanent rental apartment was 14,249 won/$\textrm{m}^2$$.$yr, that of fifty years period rental apartment was 13,372 won/$\textrm{m}^2$$.$yr. In the case of remodeling in deteriorated heating system, the principal decision factor of choice was showed “economics” as priority. Residents in rental apartment preferred remodeling to reconstruction, and unit heating system to central heating system.

Development and Performance Test of TWTA Maintenance System for the Low Altitude Surveillance Radar (저고도 탐지레이더용 진행파관증폭기 정비시스템 개발 및 성능시험 연구)

  • Yoon, In-Chul;Yun, Seok-Jin;Kwon, Jong-Won;Kim, Hie-Sik
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.47 no.6
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    • pp.43-50
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    • 2010
  • In this paper, the TWTA (Traveling Wave Tube Amplifier) maintenance system for the low altitude surveillance Radar was developed using the embedded Linux system, and its superiority was demonstrated through the performance test. Nowadays, the necessity of maintenance system and reliability testing on military equipments has been increasing steadily. In addition, nonlinear characteristics of the maintenance system for the low altitude surveillance Radar are more likely to have serious problems as well as to slow down durability. Therefore, after analyzing characteristics of RF input-output signal and TWTA, we designed interface circuits between the TWTA equipment and the embedded Linux system. The Linux kernel on the system was optimized to improve the efficiency and reliability. And our new TWTA maintenance system was evaluated in the real field. As a result, the proposed system was contented with desired specifications, and demonstrated military's fighting capabilities. Therefore, our novel system will advance military maintenance technology and will help to develop similar equipments.

Study on the Development of Maintenance Process in Long-Life Housing - Focus on the Development of Maintenance Process for the Manager - (장수명공동주택의 유지관리업무프로세스 구축에 관한 연구 - 관리자를 위한 유지관리업무프로세스를 중심으로 -)

  • Ji, Jang-Hun;Kim, Soo-Am;Yoon, Sang-Cho
    • Proceeding of Spring/Autumn Annual Conference of KHA
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    • pp.344-349
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    • 2009
  • To be Low Carbon and Green Growth, it is necessary that Long-Life Housing based on Green Technology is supplied. The main concern at the moment is developing Sustainable Housing relative to Life-Cycle or Life-Style of the residents, and the resident of Remodeling or Redevelopment. This study is aim to be Development of Maintenance Process in order to make steady dwelling when supplying Long-Life Housing that separates Support(Skeleton) and Infill different from the existing Short-Life Housing, and has durability, alterability, available remodeling, easy maintenance. Long-Life Housing should consider the maintenance about movement and variableness. In contrast, the maintenance of the existing Housing is regular maintenance, change and repair by damage. As well as Long-Life Housing should be demanded proper Development of Maintenance Process because of difference of Housing in concept, design and Construction. Therefore, this study looks into problems when applying Development of Maintenance Process in Long-Life Housing, and shows Development of Maintenance Process about the efficient Long-Life Housing for the manager.

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Development and Evaluation of the Application for Maintenance of Photovoltaic Device(3kW) (주택용 태양광발전설비 유지관리용 애플리케이션 개발)

  • Kim, Jae-Yeob
    • Journal of the Regional Association of Architectural Institute of Korea
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    • v.20 no.6
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    • pp.105-112
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    • 2018
  • The purpose of this study is to develop an application that supports a user in the maintenance of small photovoltaic device. To this end, this study analyzed the maintenance status, related regulations and existing application contents in Korea. According to the analysis results, most users did not maintain device for themselves. In addition, the maintenance market has not been activated due to its low profitability. Regulations on the maintenance of photovoltaic device prescribed by the KESCO and Japanese counterpart were analyzed to establish the standards for photovoltaic device inspection, and an application was developed based on the existing applications and research results. In order to evaluate the completeness and satisfaction of the developed application, it surveyed 52 users and 22 experts. The survey results showed that the completeness was calculated to be 90 points, and the level of satisfaction was 93 points on a 100-point scale. Therefore, it is expected that the maintenance application developed in this study will be useful for users to maintain the photovoltaic device.

The selection of RCM analysis system for efficient PM Tasks (효과적인 PM 업무를 위한 RCM분석대상 시스템의 선정)

  • Kim, Min-Ho;Song, Kee-Tae;Baek, Young-Gu;Lee, Key-Seo;Yoon, Hwa-Hyun
    • Proceedings of the KSR Conference
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    • pp.784-791
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    • 2007
  • Most operational organization and railway authority which conduct scheduled maintenance(SM) have carried out the preventive maintenance(PM) based on the information provided from supplier and manufacturer of railway system. However these activities are far away from reality and low the efficiency, it is because an appropriate methods for system selection didn't take into account for improving maintenance efficiency. Therefore, the current SM tasks and maintenance activities lead to lots of spend on the cost and time. To solve the above problem, this thesis presents new approach methodology. This proposes the criteria for reliability centered maintenance(RCM) system selection through level of quantification of each parameter, i.e, frequency, severity and maintenance cost, etc. To do this, the field operation data and information of maintenance cost are essential. As applying this methodology, we can look forward to improving efficiency of PM/SM, and reducing cost.

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Safety for the Stable Electric Power Supply (안정적인 전력공급을 위한 안전)

  • Yoon, Jae-Kun
    • 한국연소학회:학술대회논문집
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    • pp.163-165
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    • 2012
  • Korea is now the country with shortage of electric power because of limits on power usage of businesses to prevent a possible blackout during the summer and winter. This is due to the failure to predict the total power usage. And the futhermore several accidents in the power plant during the overhaul maintenance threaten the stable power supply. Accidents were due to the combustion of low calorific coal and the shortage of the maintenance time. We should not incur a future great loss by pursuing a present small profit.

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The Maintenance of An Evaluation Accreditation Indicator According to Teachers' Participation in Decision Making (인증시설 보육교사의 의사결정참여도에 따른 평가인증지표의 유지도)

  • Bu, Su-An;Lee, So-Eun
    • Korean Journal of Child Studies
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    • v.31 no.1
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    • pp.163-177
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    • 2010
  • The purpose of this study was to examine the maintenance of an evaluation accreditation indicator according to child care center teachers' participation in decision making. The subjects of this study were 139 teachers from 12 accredited national, public, private, and corporate child care centers in Seoul and North Gyeongsang Province. The TIP-2 (Teacher Involvement and Participation Scale V.2) and Accreditation Indicator for Child Care Centers were used to measure teachers' participation in decision making and accreditation indicator maintenance. Frequency, mean, standard deviation, one-way ANOVA and scheffe test were used for data analyses. The results revealed that the teachers who rated middle and high level in terms of their participation in decision-making showed higher levels of maintenance of the evaluation accreditation indicator than those with low levels of participation. This finding suggests that teachers' participation in decision making is an important factor for maintaining the quality of child care centers.

GROUND TRACK ACQUISITION AND MAINTENANCE MANEUVER MODELING FOR LOW-EARTH ORBIT SATELLITE

  • Lee, Byoung-Sun;Eun, Jong-Woo;Webb, Charles-E.
    • Journal of Astronomy and Space Sciences
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    • v.14 no.2
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    • pp.355-366
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    • 1997
  • This paper presents a comprehensive analytical approach for determining key maneuver parameters associated with the acquisition and maintenance of the ground track for a low-earth orbit. A livearized model relating changes in the drift rate of the ground track directly to changes in the orbital semi-major axis is also developed. The effect of terrestrial atmospheric drag on the semi-major axis is also explored, being quantified through an analytical expression for the decay rate as a function of density. The non-singular Lagrange planetary equations, further simplified for nearly circular orbits, provide the desired relationships between the corrective in-plane impulsive velocity increments and the corresponding effects on the orbit elements. The resulting solution strategy offers excellent insight into the dynamics affecting the timing, magnitude, and frequency of these maneuvers. Simulations are executed for the ground track acquisition and maintenance maneuver as a pre-flight planning and analysis.

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Analysis to be used for the Life Cycle Costs calculation of rolling stocks for EMU (EMU 철도차량의 LCC(Life Cycle Cost)분석)

  • Park, Su-Myung
    • Proceedings of the KSR Conference
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    • pp.177-183
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    • 2009
  • This paper deals with the topical problems of the Life Cycle Costs in connection with the rolling stocks. the LCC philosophy has already entered the third decade. this philosophy contributed towards the new relationship's comprehension between railway vehicle producers' and railway vehicle users' sphere. this leads together to the technical-economical solution convenient for the both sides. In the point of manufacturer, It is said that low operational costs could be reached using a well-designed and structured maintenance program. this is due to the proper technical analysis of critical components that leads to low costs of maintenance and a superior reliability without increasing the capital investment. but, This paper presents both topical experiences with the LCC models for the railways vehicles and also procedures during Life Cycle Costs calculations. In conclusion I want to introduce how to calculate LCC & what kinds of softwares are used based on VVVF EMU vehicle

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