High reliability is the key to performance of electrical control equipment. PLC combines computer technology, automatic control technology and communication tec
Maintainability is an important character which is given by product design process. The maintainability design criteria and measure index used in product mainta
The development of the information technology has brought threats to human society when it has influenced seriously the global politics, economics and military
Practitioners and researchers in the field of software engineering have realized that Non Functional requirement have not received due attention and second grad