• Journal of Periodontal and Implant Science
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• 제33권2호
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• pp.215-223
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• 2003

The main goal of periodontal treatment is the long-term maintenance of teeth. Periodic maintenance program is need to prevent periodontal disease and maintain healthy periodontium. Hirschfeld and Wasserman(1978) studied 600 treated periodontal patients. This study categorized periodontal patients using well-maintained, downhill, extreme downhill groups. The purpose of our study is to evaluate effect of periodontal treatment and analyse tooth loss after periodontal treatment using this classification. The study population of j9 patients had been treated and maintained for mean 5.8 years. All patients were on a periodic maintenance program at 2-, 3-, 4, or 6-month intends. The avenge age of the patients at the time of original therapy was 49.6 years. To analyse tooth loss, modified classification was used on the basis of response to therapy using by Hirschfeld and Wasserman in 1978. The results were as follows : 1. 59 treated patients were lost mean 1.42 teeth per patient for 5.8 years of maintenance period. 2. Maxillary first molars were most frequently lost but mandibular lateral incisors were lost no tooth during maintenance period. 3. Tooth mortality received surgical treatment had similar to received nonsurgical treatment. 4. Tooth loss was more frequent in maxillary teeth than mandibular teeth, and posterior teeth than anterior teeth, and more frequent tendency in male than female.

• 한국압력기기공학회 논문집
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• 제6권1호
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• pp.1-8
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• 2010

The existing maintenance program is focused on time-based maintenance to inspect and repair components according to maintenance period, rather than condition-based maintenance or predictive maintenance. The preventive maintenance template of the steam turbine has been developed for optimizing maintenance procedure and improving reliability and availability of the steam turbine of nuclear power plants based on EPRI PM template methodology and EPRI technical reports about preventive maintenance.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 춘계학술대회
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• pp.610-616
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• 2003

Recently, the common concern of nuclear power industry in the development of technology mitigating and preventing the aging of steam generator tubes prevails, because the trends of steam generator flaws at Uljin unit #1,2 and KSNP(Korea Standard Nuclear Power Plant) impose a burden on the operation of nuclear power plant. While the regulatory agency is demanding the establishment of the advanced general performance maintenance system, the steam generator management program adapting advanced technology is being developed which may comply with EPRI PWR SG Guidelines based on NEI 97-06 ‘ General Guidelines including all the maintenance aspects consist of the tube integrity assessment criteria, repair limit, allowable leakage level, water chemistry will be composed in order to obtain the approval of regulatory agency and be applied to Nuclear power plant early 2005. This presentation is to introduce maintenance state including SG tube degradation and main contents of advanced SG management program being developed, and futhermore update present and future plan, and estimate the alternation after the completion.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2000년도 봄 학술발표회 논문집
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• pp.303-308
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• 2000

By means of analyzing of monitoring technology and monitoring regulation based on maintenance monitoring system installed in subway tunnel section, it needs monitoring system, development of operating program, monitoring analyzing system and development of analysis method, establishment of maintenance monitoring standard specification, and performance of responsible monitoring supervision for applying to subway monitoring maintenance effectively in future. It requires specialized monitoring and legislation of monitoring subcontract, improvement of monitoring work contract method, establishment the standard payment of monitoring, and effective calibration and correction of monitoring system in the plan of improving monitoring regulation.

• 가스산업과 기술
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• 제2권1호
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• pp.101-110
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• 1998

• 경영과학
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• 제9권1호
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• pp.41-52
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• 1992

The QOS(Quality of Service) recognized by the customer will become the most important thing under the competitive telecommunications market. Korea Telecom is going to develop many system to manage the telecommunication network, to improve the level of QOS, and to increase the revenue. Operation and Maintenance Adiministration System is one of the systems developed to meet those purposes efficiently. This system gathers qualities data from telephone offices or operation centers and analyze the results of QOS improvement activities and evaluate overall QOS. And also system makes it possible to improve the cost/effectiveness of operation and maintenance of telecommunication network. Operation and Maintenance Administration System has four functional modules, i.e., the user interface module, the database management module, the QOS management module, and the database conversion module. The purpose of this study is to develop the QOS management program, one of the four functional modules of the system,using FOCUS 4GL/DBMS. Since Operation and Maintenance Administration System is developed using FOCUS 4GL, every user can handle and maintain the system very easily and reduce system backlogs.

• 정보처리학회논문지D
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• 제10D권6호
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• pp.999-1010
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• 2003

프로그램 슬라이싱은 프로그램의 특정 지점에 나타난 변수의 값에 영향을 미치는 문장들을 프로그램으로부터 추출하는 방법이다. 프로그램 슬라이싱은 프로그램 디버깅, 프로그램 테스팅, 프로그램 통합, 병렬 프로그램 실행, 소프트웨어 메트릭스, 역공학, 유지보수 등 여러 응용 분야에 적용할 수 있다. 본 논문에서는 포인터 변수, 포인터 변수가 참조하는 객체, 배열, 구조체가 같은 복잡한 자료구조가 나타나는 프로그램에서 정확한 슬라이스를 추가하기 위한 알고리즘을 제안한다. 복잡한 자료구조가 나타나는 프로그램 상에서 객체의 보다 더 정확한 정적 분석 정보를 생성하기 위해 객체 참조상태 그래프를 제안하고, 그 효율성을 보였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 봄 학술발표회 논문집
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• pp.1009-1014
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• 2002

In this study, developed economical and scientific Pavement Management System(PMS) that can produce suitable maintenance method through judgement and analysis of pavement condition exactly, to overcome past unscientific pavement management limitations. First, on the basis of data of the inside and outside of the country on PMS, composed logical algorithm such as pavement condition investigation and analysis, detailed naked eye investigation, whole system estimation etc., and it verified that this algorithm is suitable system through the inside and outside of the country PMS research examples and results of detailed naked eye investigation. Also, developed easily usable PMS program and PMS_GIS program with such logical algorithm.

• Nuclear Engineering and Technology
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• 제7권2호
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• pp.159-165
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• 1975

The Nuclear power industry today faces a serious and rapidly emerging problem in reactor maintenance and occupational radiation exposure control. The basic problem is the need for much maintenance on nuclear power plants. The problem is seriously compounded by radiation exposure control requirements. Many studies are underway seeking solutions tut the industry is developing rapidly and new plants will not await the results of such studies. It is essential that attention be given to maintenance and exposure control in all phases of plant design, construction and operation.

• 한국강구조학회 논문집
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• 제20권2호
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• pp.259-268
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• 2008

본 논문에서는 교량의 유지관리를 위하여 생애주기 성능 및 비용을 고려한 최적 유지관리 전략 수립 기법을 개발하였다. 제안된 기법을 이용하여 교량을 구성하는 부재수준뿐만 아니라 교량 시스템수준에서도 최적 유지관리 전략의 생성이 가능한 프로그램을 개발하였다. 실제 공용중인 강교량에 개발된 프로그램을 적용하여 부재 및 시스템 수준의 생애주기분석을 수행하고 각 수준에서 생성된 유지관리전략을 비교 고찰하여 그 적용성을 검토하였다. 부재 및 시스템 수준의 유지관리전략을 비교한 결과, 교량을 구성하고 있는 유지관리 대상 모든 부재를 고려한 교량시스템 수준에서의 분석을 통해 유지관리 전략을 수립하는 것이 보다 합리적이며 실제적인 것으로 판단된다.