• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.11
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• pp.88-95
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• 2018

Maintainability indicates how easily a system can be restored to the normal state when a system failure occurs. Systems developed to have high maintainability can be competitive due to reduced maintenance time, workforce and resources. Quantification of the maintainability is possible in many ways, but only after prototype production or with historical data. As such, the graph theory and 3D model data have been used, but there are limitations in management efficiency and early use. To solve this problem, we studied the maintainability index of weapon systems using SysML-based modeling and simulation technique. A SysML structure diagram was generated to simultaneously model the system design and maintainability of system components by reflecting the maintainability attributes acquired from the system engineering tool. Then, a SysML parametric diagram was created to quantify the maintainability through simulation linked with MATLAB. As a result, an integrated model to account for system design and maintainability simultaneously has been presented. The model can be used from early design stages to identify components with low maintainability index. The design of such components can be changed to improve maintainability and thus to reduce the risks of cost overruns and time delays due to belated design changes.

• Journal of the Korea Society for Simulation
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• v.21 no.4
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• pp.75-80
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• 2012

This paper describes the development and applications of maintainability simulation system based on virtual reality technology. The immersive type maintainability simulator using virtual reality is developed and assembly simulation using DELMIA software is conducted for an air-to-ground munition as an example. The simulation processes and result validate the feasibility and effectiveness of maintainability simulation system for logistic element development.

• Proceedings of the KIEE Conference
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• summer
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• pp.1400-1402
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• 2004

The safety of staff, customers and of general Public in general viewed as one of the most important requirements in the urban transit. The maintenance computerization system for car of urban transit is a part of standardization and development of urban transit system. and We have been performed the establishment of maintenance computerization system from 2001 to 2005. The RAMS (reliability. availability. maintainability and safety) estimation for maintenance computerization system are utilized in a variety of computerization system for user's convenience and safety in maintenance. Ever since its inception though. the urban transit has searched for ways to improve reliability. availability. maintainability and safety of the railway subsystem. Provision of a reliable maintenance system include RAMS of the vehicles plays a very important role in achieving a safe system.

• KIPS Transactions on Software and Data Engineering
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• v.3 no.3
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• pp.109-118
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• 2014

Code refactoring focuses on enhancing the maintainability of software to extend its lifetime. However as software applications were varied and the range of its usage becomes broaden, there are some efforts to improve software qualities like performance or reliability as well as maintainability using code refactoring techniques. Recently, as low-energy software has become one of critical issues in mobile environment, developing energy efficient software through code refactoring becomes an important one. Therefore this paper has its goal to investigate whether the existing refactoring techniques can support energy efficient software generation or not. That is to say, the existing code refactoring techniques can cause the minus of energy efficiency because they did not considered the energy consumption in their refactoring process. This paper experiments and analyzes to check whether the M. Fowler's code refactoring techniques can support the energy efficient software generation or not. Our research result can give to software developer some informations about energy-efficient refactoring techniques, and can support the development of software that has high maintainability and good energy efficiency.

• Proceedings of the KSR Conference
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• 2007.11a
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• pp.713-718
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• 2007

This paper is described the System of effective RAMS Management established for AREX Railway System. This system for AREX's E&M system contains FRACAS(Failure Reporting, Analysis and Corrective Action Plan) and computation of RAMS indices. This procedure is applying to improve the Reliability, Availability, Maintainability and Safety for railway system in operation stage. Furthermore, this system would be a basis of RCM(Reliability Centred Maintenance).

• Journal of the Korea Society for Simulation
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• v.24 no.2
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• pp.19-29
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• 2015

M&S techniques are utilized for various purposes on the national defense, and its importance is increasing than ever. For analyzing RAM (Reliability, Availability and Maintainability) of weapon system, using M&S techniques can be more effective and practical way than deterministic approach, because M&S approach can consider uncertain variables and various constraints in the ILS (Integrated Logistics support) field. For design of ILS M&S, we first set up a purpose of M&S, attributes of real system and other similar ILS M&S tool. Then, we convert real system into model which consists of mathematical formula and logical expression. In this thesis, we introduce modeling procedures of M&S that describes total life cycle of 'OO guided weapon system' and the contents proposed in this paper can provide references for developing other M&S tool.

• Journal of Power System Engineering
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• v.14 no.6
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• pp.61-66
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• 2010

Engineering asset management (EAM) requires the accurate assessment of current and the prediction of future asset health condition. Suitable mathematical models that are capable of predicting time-to-failure and the probability of failure in future time are essential. In general reliability models, lifetime of component and system is estimated using failure time data. This paper deals with the reliability assessment of elevators using life of main components. Especially this work is concerned with the stochastic nature of life of elevator components. First, we investigate the Weibull statistical analysis of lifetime data for the components. The final goal is to establish the mathematical model for reliability assessment. This work provides more perspectives to future research in the fields of reliability and maintainability.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1653-1656
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• 2005

Korea Railroad Research Institute(KRRI) has developed the rubber-tired AGT system from 1999 to 2005. The rubber-tired AGT system is now on test for its performance and function at the test line in Gyeong-San. This paper is concerned with the recent development of the AGT system and its reliability evaluation technology which are now being applied in test line. Also, we made the reliable program to assure required the RAMS((reliability, availability, maintainability & safety) of the AGT system.

• Proceedings of the KSR Conference
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• 2004.06a
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• pp.819-825
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• 2004

The maintenance CALS system for car of urban transit is a part of standardization and development of urban transit system, and We have been performed the establishment of maintenance CALS system from 2001 to 2005. These 2D and 3D configuration management system are utilized in a variety of CALS system for user's convenience and safety in maintenance. In this paper, the 2D and 3D configuration system will be discussed for necessity and possibility. This system include RAMS(reliability, availability, maintainability and safety) of the vehicles shall be enhanced in the future.

• Proceedings of the Korean Information Science Society Conference
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• 2008.06b
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• pp.44-48
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• 2008

분산 시뮬레이션 환경에서 모의되는 개체의 재사용성과 개체 간 상호운용성을 높이기 위해서 Modeling & Simulation 기법이 적용된 M&S Framework이 제안되었다. 제안된 프레임워크의 미들웨어 통신을 담당하는 시뮬레이션 네트워크 관리자는 계층적 아키텍처 스타일을 적용함으로써 관리성(maintainability), 재사용성(reusability), 확장성(scalability) 등의 요구사항을 지원하도록 설계되었다. 하지만 프레임워크를 구현한 다양한 모의 개체의 생성은 메시지의 인터페이스 코드에 대한 중복을 증가시키고, 인터페이스 변경 요구사항에 대해서 시뮬레이션 네트워크 관리자가 적용된 모든 모의기의 변경 또한 불가피해 진다. 본 논문에서는 인터페이스에 대한 코드의 중복을 없애고, 인터페이스의 변경에 대하여 유연성을 가질 수 있도록 메타프로그래밍 기법을 적용한 분산객체 통신 모듈을 제안한다. 또한 이 기법을 적용할 경우 구현 문제와 관련된 이슈와 장 단점을 기술한다.