• 한국컴퓨터정보학회논문지
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• 제27권1호
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• pp.51-59
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• 2022

무기체계의 소프트웨어 기능 의존성이 높아짐에 따라 소프트웨어는 무기체계를 제어하는 핵심요인으로 자리매김하였다. 또한 국내/외적으로 소프트웨어 개발이 중요해지면서 소프트웨어에 대한 검증이 쟁점이 되고 있다. 최근 방산시장에서 이러한 점을 인식하고 무기체계 소프트웨어 유지보수를 위한 방안을 요구하고 있다. 본 논문에서는 자동화시험장비(Automatic Test Equipment, ATE)를 이용하여 무기체계 소프트웨어 유지보수 방안을 제시한다. 그 구체적인 방안은 시뮬레이터를 활용하여 소프트웨어 기능을 확인하고 고장 케이스를 식별하는 것이다. 이는 개발업체가 고장 케이스를 식별하는 시간을 줄임으로써 무기체계 총 고장정비시간(Total Corrective Maintenance Time, TCM)을 감소시킬 수 있는 효과적인 방법이다. 제안된 소프트웨어 유지보수 기능 추가된 자동화시험장비(ATE)는 기존 대비 정비도 및 운용가용도(OA)가 개선됨을 입증하였다.

• 한국CDE학회논문집
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• 제12권3호
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• pp.171-181
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• 2007

Ubiquitous computing is a vision of our future computing lifestyle in which computer systems seamlessly integrate into our everyday lives, providing services and information in anywhere and anytime fashion. Augmented reality (AR) can naturally complement ubiquitous computing by providing an intuitive and collaborative visualization and simulation interface to a three-dimensional information space embedded within physical reality. This paper presents a service framework and its applications for providing context-aware u-car maintenance services using augmented reality, which can support a rich set of ubiquitous services and collaboration. It realizes bi-augmentation between physical and virtual spaces using augmented reality. It also offers a context processing module to acquire, interpret and disseminate context information. In particular, the context processing module considers user's preferences and security profile for providing private and customer-oriented services. The prototype system has been implemented to support 3D animation, TTS (Text-to-Speech), augmented manual, annotation, and pre- and post-augmentation services in ubiquitous car service environments.

• 한방비만학회지
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• 제19권2호
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• pp.119-136
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• 2019

Objectives: People often fail to maintain their weight even though they have succeeded in weight loss. The purpose of this study was to review previously published study results with regards to the predictive factors associated with weight loss maintenance after successful weight loss. Methods: The authors searched for the articles related to weight loss maintenance after successful weight loss, published up until June 2019 on PubMed, Cochrane Central Register of Controlled Trials (CENTRAL), Embase, Research Information Sharing Service (RISS), and Koreanstudies Information Service System (KISS). A total of 76 articles were finally selected. From the study results, changeable and unchangeable predictors were extracted, and these predictors were examined according to detailed categories. Results: The changeable predictors of weight loss maintenance included behavioral factors, psychological factors and treatment process-related factors, whereas the unchangeable predictors included genetic and physiological factors, demographic factors, history of treatment on obesity-related factors. The main factors of weight loss maintenance were changeable predictors such as healthy eating habits, dietary intake control, binge eating control, regular exercise and physical activity, depression and stress control, social supports, self-regulation, self-weighing and initial weight loss and unchangeable predictors such as low initial weight and maximum lifetime weight. Conclusions: The results of our review results suggest that changeable and unchangeable predictors of weight loss maintenance should be carefully examined during treatments of obesity.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2011년도 제43차 동계학술발표논문집 19권1호
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• pp.109-110
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• 2011

현대의 도시철도차량 시스템은 복잡하고 첨단화 되어 있으며, 상호 인터페이스 체계를 구축하고 있는 차량 유지보수시스템의 체계적인 종합관리가 필요하다. 본 연구는 무선 전송 장치를 이용하여 전동차 정보 자동 수집 장치를 도입 적용한 사례에 대한 분석 결과이다. 무선 전송 장치는 차량기지로 입고한 전동차 열차종합제어장치에 수집된 각종 정보를 무선 통신으로 데이터를 전송함으로써 유지보수 비용절감과 데이터 전송의 신뢰성 향상 효과가 있으며 이러한 무선 전송 장치를 도입 적용하여 기존의 열차정보수집 방법을 개선한 운용 사례를 제시한다.

• 한국국방경영분석학회지
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• 제18권2호
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• pp.1-22
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• 1992

Computer-aided logistics support system is recognized an essential system to reduce supply and maintenance cost, and to improve readiness of weapon system or operationable composite machines. According to these trends, this paper focuses on the design scheme and the computerization strategy of information management system for Integrated Logistics Support (ILS) work. Suggested system. LAMIS(Logistics support Analysis Management Information System) is a total system that composed of Logistics Support Analysis Management information system (LSAM), Configuration Management Information System (CMIS), Maintenance Management Information System (MMIS), Project Management System (PMS) and Information Retrival System(IRS) etc. Also, LAMIS is a computerized tool that improves current supply and maintenance support program, that attempts to reliable requirment analysis of logistics support elements, and that supports to use the existing technical specification of similar one when weapon system acquisition project is started newly. When LAMIS implication is completed, it can be applied to logistics support of defense or commercial site. Straightway, LAMIS will be enhanced with computer - aided design system, engineering drawing system, interactive electronic technical manual system, electronic data interchange system, and three dimensional simulation system to weapon system configuration. When that is done, LAMIS is CALS system.

• 대한산업공학회지
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• 제36권2호
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• pp.108-116
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• 2010

The maintenance of a deteriorating system is often imperfect. Previous studies have shown that the imperfect preventive maintenance (PM) can reduce the wear out and aging effects of deteriorating systems to a certain level between the conditions of as good as new and as bad as old. In this paper, we employ the concept of the improvement factor in investigating two optimal PM policies; failure limit policy and periodic PM policy. We redefine the improvement factor model as a function of the cost of PM, using this concept, we derive the conditions of optimal PM policies and formulate expressions to compute the expected cost rate. Based on this information, the determination of the maintenance policies which minimize the cost rate is examined. Numerical examples for the Weibull distribution case are also given.

• 한국IT서비스학회지
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• 제20권4호
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• pp.23-33
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• 2021

The prolonged coronavirus 19 (COVID-19) has caused serious problems such as job losses and youth unemployment, but as the fourth industrial revolution and digital transformation accelerate, the importance of SW is highlighted and more qualified jobs are expected in the SW industry. However, domestic SW companies are having difficulties in not properly recognizing the value of SW products. Among many related issues, commercial SW maintenance-related issues are representative, and the main problem is the difference in the maintenance fee rates between domestic and foreign SW. In this study, the expected job creation effect when the SW maintenance rate is raised was analyzed using data related to the SW industry and commercial software. As a result of the analysis, the amount required to raise the commercial SW maintenance rate by 1% is 162 billion won. If all of these are used for employment, the expected new job creation effect is 3,240 jobs per year, and 15,451 jobs are created per year when calculated and estimated as the effect of increasing sales through the employment inducement coefficient. In addition, the amount required to raise the current average maintenance rate of 11.1% to 15% is 631.9 billion won, and it was possible to estimate the effect of creating jobs for 12,648 people based on the simple average wage and 60,259 people from the sales increase effect.

• 교육녹색환경연구
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• 제11권1호
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• pp.32-41
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• 2012

According to the educational statistics and information data, there were 11,317 elementary school, middle school and high school facility as of 2011. During the post decade, 1,256 schools are increased. The school facility maintenance is the important factor for the whole facility life cycle because it determines the useful life of a facility. Current school facility maintenance practices tend to ad-hok kery, namely, repairment is made after a problem is discovered. The purpose of this study is to propose the new maintenance works and management system to improve the process of maintenance. In addition, the authors suggested school facility improvement plan based upon the questionnaire survey of related management officials.

• 산업경영시스템학회지
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• 제21권46호
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• pp.229-240
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• 1998

In these days, we are facing the needs of the times that the product have to be converted from quantity to quality. Most companys now pay more attention to maximize efficiency of facilities with introducing high priced equipments, those equipments are too automated and electronic that partial failure or short time stop leads to the stop of producing process in the whole factory. Consequently, effective maintenance management of production equipment becomes a only solution against problems. This thesis develops a preventive maintenance software that grasp a failure sign through daily inspection with management item, Machine-Capability index and estimate a trend, determine the time of preventive maintenance. The software is useful to the plant operator in analyzing information easily and controlling preventive maintenance operations efficiently.

• International Journal of Safety
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• 제5권2호
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• pp.6-11
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• 2006

The time delay in servo control on LonWorks/IP Virtual Device Network (VDN) is highly stochastic in nature. LonWorks/IP VDN induced time delay deteriorates the performance and stability of the real-time distributed control system and hinders an effective preventive and predictive maintenance. Especially in real-time distributed servo applications on the factory floor, timely response is essential for predictive and preventive maintenance. In order to guarantee the stability and performance of the system for effective preventive and predictive maintenance, LonWorks/IP VDN induced time delay needs to be predicted and compensated for. In this paper position control simulation of DC servo motor using Zero Phase Error Tracking Controller (ZPETC) as a feedforward controller, and Internal Model Controllers (IMC) based on Smith predictor with disturbance observer as a feedback controller is performed. The validity of the proposed control scheme is demonstrated by comparing the IMC based on Smith predictor with disturbance observer.