• 산업경영시스템학회지
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• 제13권22호
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• pp.17-24
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• 1990

The inventory problem of the repairable items is modeled as a queueing network for the purpose of determining the number of spares in a multi-echelon repair system subject to stochastic failure. In this paper, we are considering a finite number of repairman at each base and the depot. After repair job has completed, the repaired items are returned to the base where they have originated. For the system, we identify the distribution of the total number of failed items which belongs to a base and develope a method to find spare inventory levels of the repairable items at each base to satisfy a specified minimum fill rate.

• 한국정밀공학회지
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• 제11권5호
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• pp.110-123
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• 1994

The development of automatic production systems have required inteligent diagnostic and monitoring function to repair system failure and reduce production loss by the failure. In order to perform accurate functions of intelligent system, inferencing about total system failure and fault analysis due to each mechanical component failures are required. Also the solution about repair and maintenance can be suggested from these analysis results. As an essential component of mechanical system, a bearing system is investigated to define the failure behavior. The bearing failure is caused by lubricant system failure, metallurgical defficiency, mechanical condition(vibration, overloading, misalignment) and environmental effect. This study described roller bearing fault train due to stress variation and metallurgical defficiency from lubricant failure by using FTA.

• Journal of Chest Surgery
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• 제37권10호
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• pp.861-864
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• 2004

역행성 심정지의 사용과 연관된 관상정맥동의 손상은 드물며 사망까지 가능한 합병증이다. 심내막염, 승모판막폐쇄부전증과 심비대를 보인 노인 환자에서 역행성 심정지액 투여 중에 발생한 관상정맥동의 파열과 심장내 복구 방법을 보고한다.

• Journal of Chest Surgery
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• 제33권7호
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• pp.581-584
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• 2000

정부 기관 및 식도 관통 손상은 높은 이환율과 사망률을 동반할 수 있으므로 적절한 진단 및 치료방법을 선택하는 것이 중요하다. 기관 및 식도의 복합손상을 가진 한 환자에서 체외 순환을 이용해 봉합수술을 시행하였고 만족할 만한 결과를 얻었다. 경부의 깊은 손상으로 인한 출혈과 감염을 미리 조치할 수 있다면 기관과 식도의 관통산 때 체외순환을 이용하여 수술하는 srjt이 안전한 치료방법이 될 수 있다고 생각된다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
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• pp.597-600
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• 2003

The development and maintenance of a sound bond are an essential requirements of concrete repair and replacement. The bond property of a bonded overlay to its substrate concrete during the lifetime is one of the most important performance requirements which should be quantified. A standard or a verified bond strength measurement method is required at field for screening, selecting materials and quality control for overlay or repair materials. This study compares the nipple pipe direct tensile test, flexural adhesion test, and core pull-off test with their test results. Substantial differences in the failure stresses of three test methods were attributed to their different geometries and loading conditions. From these comparison and investigation, core pull-off test was relatively good because the coefficient of variation values were about 2%. It would be suitable for use in-situ because of its simplicity and accuracy.

• 대한치과의사협회지
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• 제54권12호
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• pp.996-1023
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• 2016

There are many kinds of maintenance care services for removable denture patient. Adjustment of the denture base and occlusion should be performed regularly not only for pain relief but also for maintaining the denture function. Direct and indirect relining are needed frequently in specific cases including mandibular distal extension case or non-symmetric residual teeth situation. Surface treatments for metal and resin are essential in the relining procedure. Clinical process for the denture repair is similar to indirect relining which needs inter-occlusal registration. Especially, the peridontal maintenance care and caries prevention are most important way to preserve the abutment teeth in partial edentulism. Moreover, the caring method for the denture and the tissue should be instructed to the denture patient.

• 가정과삶의질연구
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• 제20권5호
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• pp.51-67
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• 2002

The purpose of this study is to find the role and issues of housing management under the community care system which cover the middle class older people. Research method was qualitative research by the interview of 21 subjects with open-ended questionnaire. Most of the older people want to live in the community alone with poor supporting system, because present community care system does not established well, so it cannot cover the staying put service for independent living, such as community alarm, care and repair, handyman, floating support, and meal service within the community. The result showed that community care might be partially avaliable from the welfare center but not well established or transfer to Dong-Office as an agency of community welfare center. However, the subjects had higher needs about housing management for older people than previous study on the hypothetical level. Successful pilot project might be required to develop the community care system focused on housing management for older people.

• 가정과삶의질연구
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• 제20권5호
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• pp.137-147
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• 2002

Purpose of this study is to find the research direction to solve the housing problems for the elderly which based on approaches and issues in related studies. Research method was interpretative analysis of the articles issued from 1976 to 2002. Each approach (rationalistic approach, ecological approach, micro-sociological approach, typological approach, environment-psychological approach, welfare approach) produced helpful information and had relative merits. But the researchers must regard housing for the elderly as a social problem in macroscopic view to solve the housing problems for older people with welfare approach. As a result, to solve the housing problems with welfare approach for the elderly who live in their own place with community care, studies about lifetime home, care and repair, and management of housing for the elderly might be needed. And research about existing services, transfer system of services, financial problems, man power to manage the system might be needed to spread out the services to the middle class elderly.

• 한국국방경영분석학회지
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• 제24권1호
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• pp.98-109
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• 1998

This study develops a maintenance strategy for a reparable 2-unit standby system. The maintenance strategy implies the waiting time to call the repair facility when the unit-1 fails. Almeida and Souza set up the multi-attribute utility function consisting of system availability and repair cost for several maintenance strategies and decide the optimal maintenance strategy that maximize the expected value of the utility function. We decide the optimal maintenance strategy satisfying the following two criteria about the utility function : maximum variance using Almeida and Souza's utility function. It both criteria are not satisfied at the same time for every strategies, the strategy maximizing the lower confidence limit for expected utility function is regarded as an optimal one.

• 상하수도학회지
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• 제27권6호
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• pp.731-741
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• 2013

CCTV inspection method has been used in Korea for more than 20 years, but there is no proper assessment system for sewer failure severity that considers the domestic circumstances. This study classified the defects caused by the overburden load of reinforced concrete sewer pipes depending on severity and developed defect code by analyzing the domestic CCTV inspection videos. The defect score was assigned to each defect code, and it was classified into 5 grades for the decision-making of repair and rehabilitation. The result of this study is expected to be useful for domestic CCTV inspectors to assess the sewer condition and helpful for managers to make a decision of repair and rehabilitation.