The quality of the software's internal structure tends to decay due adaptation environmental changes. Therefore, it is beneficial maintain software benefit future phases life cycle. A common correlation exists between decaying structures and problems like smell maintenance costs. Refactoring a process artifacts based on smell. Decomposition classes one most refactoring actions Blob performed at...

According to the increasing demand of interactive information rail transit on-board signal equipment, author designed a monitoring and maintenance system based on data mining set association rules for operation acquisition propose correlation algorithm obtain more reliable understanding quality evaluation train information.From lot logs, quickly find key issues, applied in test repair field.The...

Good maintainability is an essential feature for machines and processes in industry. It promotes, among others, maintenance safety, postmaintenance reliability and cost-effective maintenance by ensuring quick and easy operation and short downtime. Virtual engineering tools provide an effective way for maintainability design already during the design phase. Machine designers may not consider mai...

A strong focus on quality attributes such as maintainability and ¯exibility has resulted in a number of new methodologies, e.g., object-oriented and component-based design, which can signi®cantly limit the application performance. A major challenge is to ®nd solutions that balance and optimize the quality attributes, e.g., symmetric multiprocessor (SMP) performance contra maintainability and ¯e...

It is generally accepted that the quality of the information system (IS) is highly dependent on decisions made early in the IS development. Conceptual data model is a key artifact built at the early phases of the IS life cycle, therefore its quality influence on the quality of IS which is finally implemented. We focus this paper on the maintainability of conceptual data models, because it is on...

The prevalent trend in software and system engineering is towards component-based design. The distributed object technologies such as OMG's CORBA, Microsoft's COM/DCOM, and Sun Microsystem's EJB are slowly moving into the domain of component-based software engineering. This paper evaluates these three technologies and puts forward a rationale as to why they have the potential to provide the req...

As applications evolve over time, it becomes increasingly desirable to be able to adapt a system, enabling it to handle situations in different ways and to handle new situations. We refer to this as the flexibility and maintainability of a system. These features come at a cost. We argue here that they are an important aspect of evaluation, and that we need to measure these costs. To start getti...

Multiple dispatch allows determining the actual method to be executed, depending on the dynamic types of its arguments. Although some programming languages provide multiple dispatch, most widespread object-oriented languages lack this feature. Therefore, different implementation techniques are commonly used to obtain multiple dispatch in these languages. We evaluate the existing approaches, pre...