• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.777-783
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• 2007

Life cycle costing is one of the most effective cost approaches when we choose a solution from series of alternative so the least long-term cost ownership is achieved. Life cycle costing in railway industry has been focused on the prediction of investment for railway vehicles. But in today, the life cycle cost, LCC, prediction on the aspect of operation and maintenance cost through whole life cycle is highly necessary. In this paper, we present a strategy for the development of life cycle cost estimation software on the aspect of maintenance strategies of railway vehicle. For this purpose, we suggested a structure of LCC software based on the UNIFE LCC model. And we developed a pilot version of software to evaluate the LCC model that we suggested for railway vehicle. We performed LCC analysis on the brake module of metro vehicle in case study and concluded that the software and model developed in this research could enough to support engineers in choosing better cost effective solutions from many alternatives.

• Journal of Information Technology Applications and Management
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• 제19권2호
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• pp.135-147
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• 2012

Software architecture, as a blueprint for the system, should provide a robust foundation for design, implementation, and maintenance, for communication and documentation, and for reasoning about important system properties. Software architecture plays a central role during the whole software life-cycle. There are so diverse definitions of the software architecture, however, and there is no common agreement about what software architecture is. Examining 27 'published' definitions of software architecture, we synthesize an extensive model on the essential elements of software architecture, which consists of components, interaction among components, well-formed structure, reasons, and various perspectives. Further, we explore the possibility of unifying diverse software architecture definitions into a software architecture life-cycle model.

• 응용통계연구
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• 제23권3호
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• pp.573-584
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• 2010

This paper considers the differences in the software execution environments in the testing phase and the operational phase to determine the optimal release time and warranty period of software systems. We formulate equations for the total expected software cost until the end of the software life cycle based on the NHPP. In addition, we derive the optimal release time that minimizes the total expected software cost for an imperfect debugging software reliability model. Finally, we analyze the sensitivity of the optimal testing and maintenance design related to variation of the cost model parameters based on the fault data observed in the actual testing process, and discuss the quantitative properties of the proposed model.

• 한국인터넷방송통신학회논문지
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• 제14권2호
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• pp.23-34
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• 2014

소프트웨어 프로젝트에 대해 12개의 다른 소프트웨어 생명주기 모델들이 제안되었지만 모든 소프트웨어의 특성을 만족시킬 수 있는 일반화된 모델이 없는 실정이다. 개발조직은 여러 모델들을 적절히 혼합하여 개발될 시스템과 능력에 맞도록 새로운 모델을 개발하여야만 한다. 본 논문에서는 다양한 소프트웨어 개발 상황에 보다 적합할 것으로 판단되는 중첩-동시개발 생명주기 모델을 제안하였다. 먼저, 개발 과정을 추상화와 구현으로 구분하여 추상화는 개념정립단계부터 상세설계단계 시작시점까지로, 구현은 상세설계단계부터 시스템 시험단계로 분류하였다. 다음으로, 추상화는 파레토 법칙을 적용하여 하나의 단계에서 개발될 기능이 20% 진행된 시점에서 다음 단계를 시작하는 중첩된 단계 개념을 도입하였다. 구현은 하나의 UC가 완료되면 바로 다음 단계 수행 팀에게 전달하여 여러 단계가 동시 수행되어 개발하는 형태를 도입하였다. 제안된 모델은 개발자원 활용의 비효율성을 크게 줄일 수 있는 장점이 있다. 제안된 모델을 적용시 보다 빠른 시간에 보다 저렴한 비용으로 보다 좋은 품질의 소프트웨어를 개발하여 고객에게 납품할 수 있어 고객을 만족도를 향상시킬 수 있으며, 더불어 소프트웨어 개발 성공률을 높이는데도 기여할 것으로 판단된다.

• 품질경영학회지
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• 제29권4호
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• pp.1-17
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• 2001

The characteristics of Telecommunication Industry encompass not only hardware and software but also the service aspect of them. One way to improve the industry up to the international level in terms of hardware and software as well as service aspect is to comply with tile TL 9000 standard, which was established by QUEST Forum, the group consisted of U.S. communication industry, based on the ISO 9000 Quality Management System. In this study, design, establishment, implementation, maintenance and improvement of quality system for domestic telecommunication industry are thoroughly investigated based on TL 9000 standard, with its LCM(Life Cycle Model) model and measurements. Also, Process Approach is suggested to help the industry realize the system to meet its specific needs. In addition, specific examples with the successful certification to TL 9000 standard are presented.

• 한국지능시스템학회논문지
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• 제16권4호
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• pp.416-422
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• 2006

소프트웨어 개발 인력 프로파일에 대한 현존하는 모든 통계적 모델들은 소프트웨어 사용과 개발 프로세스의 가정에 기반을 두고 있어 일반적으로 적용 가능한 추정과 예측 모델이 없는 실정이다. 본 논문은 예측필터를 적용하여 소프트웨어 개발 투입 인력 프로파일을 예측하였다. 먼저 소프트웨어 개발 인력분포를 살펴보고, 예측필터를 적용하기 위해 모델의 입력 -출력, 모수를 결정하는 방법을 제시하였다. 이어서 제안된 모델의 유용성은 실제 개발된 소프트웨어 프로젝트로부터 획득된 데이터 분석으로 경험적으로 검증되었다. 평균 상대오차와 Pred(0.25)에 기반하여 제안된 예측필터는 잘 알려진 통계적 추정 모델들과 비교되었다. 검증 결과 예측필터는 단순한 구조를 갖고 있으면서도 소프트웨어 인력분포를 적절히 표현하는 결과를 보였다.

• Journal of Information Technology Applications and Management
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• 제20권3호
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• pp.1-18
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• 2013

Software architecture is the blueprint for a software system and should provide consistent guidelines for design, implementation, and maintenance throughout the entire lifecycle of the system. Components, interactions between the components, well-formed structure, reasons, and various perspectives reflecting various stakeholders' concerns changing through the phases of software lifecycle are the key elements of software architecture. The architect identifies and engages the stakeholders, understands and captures stakeholder's concerns including those regarding life cycle, and lets the concerns reflected in the architecture. To do so, architect should take into consideration various contextual elements regarding the system too. We make an extended list of the elements, especially those of business application software architecture, that the architect should take into consideration and construct a model of the relationships between the elements.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.1033-1038
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• 2005

As a global effort to conservate the environment, life cycle assessment(LCA) which considers the environmental impact through the life cycle of a product, from acquiring of resources to scrapping, has been actively applied. The LCA is a tool to calculate quantitatively the environmental impacts caused by products or services through their life cycles. The list of numerous data should be analyzed, stored and conducted in order to assess the environmental impacts. Therefore, it is necessary to develop a software for LCA, which can perform the interpretation as well as the environment impact assessment to execute the analysis of such a large number of data effectively. At this time, for the existing some kinds of general LCA softwares, the information about all of input and output should be fed directly and the conclusion is deduced by linking to the database from the public authorized organizations. That makes it possible to evaluate the environmental grades accurately, but it is too slow and difficult for general users to operate and applied it into an electric motor unit(EMU). Therefore, in this research, the basic model was designed, which is based on construction of database structure of the software and organization of architecture, to develop an advanced software for EMU according to user and purpose of it by benchmarking of domestic and international softwares. The result of this study would be applied to develop the LCA software in the future.

• Journal of Information Technology Applications and Management
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• 제20권2호
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• pp.69-87
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• 2013

The expanded spiral model in this paper consists of five processes of architecture design, architectural construction, architectural maintenance, operation, and architectural management. The former four processes are executed alternatively, while the latter architectural management process is executed continuously interacting with the other processes during the whole life cycle of the system. The expanded spiral model provides a conceptual framework to sort discussions of architectural degeneration into those of product-oriented processes and those of management processes, making it possible to incorporate the models and body of knowledge about project and program management especially those of Project Management Institute, into discussions of architectural degeneration. A good architecture decomposes the software-intensive system into components mutually interacting in a well-formed structure. The architecture design process and the architectural construction process together create the object system with well-designed architecture. The architectural maintenance process prevents the implemented architecture deviate from the designed architecture. The architectural management process monitors the changes of requirements including architecturally significant requirements, supports the other processes to be executed reflecting various perspectives of stake-holders, and creates and documents the reasons of architectural decisions, which is considered as a key element of the architecture.

• 한국컴퓨터정보학회논문지
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• 제22권3호
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• pp.69-79
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• 2017

In this paper, we propose our four-phase life cycle of P2P botnet with corresponding detection methods and the future direction for more effective P2P botnet detection. Our proposals are based on the intensive analysis that compares existing P2P botnet detection schemes in different points of view such as life cycle of P2P botnet, machine learning methods for data mining based detection, composition of data sets, and performance matrix. Our proposed life cycle model composed of linear sequence stages suggests to utilize features in the vulnerable phase rather than the entire life cycle. In addition, we suggest the hybrid detection scheme with data mining based method and our proposed life cycle, and present the improved composition of experimental data sets through analysing the limitations of previous works.