Maintainability is perhaps one of the most important aspects of software development in that maintenance costs account for at least 50% of software system lifetime costs. A common maintenance practice is adding new capabilities to satisfy the evolving system dynamics, thus contributing to the ever-growing expenses. This paper discusses some lessons learned from system modifiability that affect ...

Maintainability is a measure of the ease with which a software system can be maintained. In this paper we propose a quantitative deenition of maintainability, and discuss means to estimate the maintainability of a software system on the basis of a static analysis of its deliverables. Such an estimation eeort is useful inasmuchas it allows us to predict the maintainability of a software system a...

With the industrial products competition, reliability, maintainability and safety are key characteristics for availability improvement. This is mainly true in industries like automotive, aeronautic, or NC machines tools. Therefore, it is crucial to predict these characteristics as soon as possible before the manufacturing starts. This paper presents an approach to provide indicators for maintai...

Fault-tolerant (FT) architectures based on classic spatial and temporal redundancy are used in an increasing number of applications. However, the hardware platforms underlying modern highreliability systems have little resemblance to those that were common when such architectures were devised. The earlier fault models are not necessarily out-of-date (e.g. stuck-at faults still play an important...

In Spain, the actual wind power capacity nearly reaches 20000 MW, what corresponds to a 16 % of the total capacity available to supply the electricity demand [1]. The amount of wind energy produced in the Spanish electric market has increased due to the construction of wind farms and to the improvement in their availability [2]. This improvement, is obtained by the analysis and continuous impro...

This paper introduces a general framework to allow the concepts of multi agent technology to be extended to support reconfigurable systems – systems in which the functionality of both the associated hardware and software can be altered dynamically or statically with time. The utilization of such a paradigm has the potential to greatly increase the flexibility, efficiency, expandability, and mai...

The notion of maintenance often appears in the AI literature in the context of agent behavior and planning. In this paper, we argue that earlier characterizations of the notion of maintenance are not intuitive to characterize the maintenance behavior of certain agents in a dynamic environment. We propose a different characterization of maintenance and distinguish it from earlier notions such as...

ULS systems [1] are characterized by hundreds of thousands of hardware platforms and software systems connected through hierarchies of heterogeneous wireline and wireless networks. The development and maintenance of ULS systems is extremely hard due to the decentralization, dynamics, and heterogeneity of the computation and communication infrastructures that support these systems. The criticali...

utilizing the gathered failure data and failure interval data from tabas coal mine in two years, this paper discusses the reliability of powered supports. the data sets were investigated using statistical procedures and in two levels: the existence of trend and serial correlation. the results show that the powered supports follow the gamma reliability function. the reliability of the machine de...

-This paper presents the relation between software metrics and maintainability and the metrics which characterise the ease of the maintenance process when applied to a specific product. The criteria of maintainability and the methods through which these criteria are understood and interpreted by software programmers are analysed. Surveys and examples that show whether software metrics and maint...