Object-Z is strong in modeling the data and operations of complex systems. However, it is weak in specifying real-time and concurrent systems. The Timed Communicating Object-Z (TCOZ) extends Object-Z notation with Timed CSP's constructs. TCOZ is particularly well suited for specifying complex systems whose components have their own thread of control. This paper demonstrates expressiveness of th...

Object oriented constraint programs (OOCPs) emerge as a leading evolution of constraint programming and artificial intelligence, first applied to a range of industrial applications called configuration problems. The rich variety of technical approaches to solving configuration problems (CLP(FD), CC(FD), DCSP, Terminological systems, constraint programs with set variables, . . . ) is a source of...

This paper presents a framework for developing Z speciications in an object-oriented style. Within the framework, object-oriented concepts and design strategies are captured by the application of development operators. The framework also records the history of operator application enabling \classes" to be identiied and, hence, the possibility of modular veriication and reenement.

In this paper we use a semantic integration of Object-Z and CSP to formally specify interactive systems. Interactive systems can be viewed as composed of functionality, presentation and interaction with diierent notations appropriate to each aspect. A model-based notation such as Object-Z can be used for deening functionality and presentation but a behaviour-based notation such as CSP is requir...

In the thesis an approach to the formal specification of interactive systems which embodies a number of pragmatic criteria is presented. The criteria we use for pragmatism are that any proposed approach to specification should directly support usability reasoning, that the specifications should be expressive, and that they should be reusable. We examine the concept of usability reasoning, and u...

Real-time safety critical systems have both functional and timing requirements. Producing the correct result at the right time is the goal of such systems. The creation of a precise speciication of a real-time system is essential for the development of the system. This paper applies and extends the formal speciication language Object-Z to incorporate the notion of timing behaviour for specifyin...

In this paper we define a combination of Object-Z and CSP called CSP-OZ. The basic idea is to define a CSP-semantics for every Object-Z class. Special care is taken to capture the characteristics of input and output parameters properly and to preserve the expected refinement rules. CSP-OZ is well suited for the specification and development of communicating distributed systems. It provides powe...

Formal modeling techniques can be used to define and verify software architectures precisely. This paper applies the recently developed integrated formal specification technique, Timed Communicating Object Z (TCOZ), to the generic software architecture modeling and verification.

Self-imaging means image formation without the help of a lens or any other device between object and image. There are three versions of self-imaging: the classical Talbot effect (1836), the fractional Talbot effect, and the Montgomery effect (1967). Talbot required the object to be periodic; Montgomery realized that quasiperiodic suffices. Classical means that the distance from object to image ...

This paper presents a formal framework for modelling and analysing mobile systems. The framework comprises a collection of models of the dominant design paradigms which are readily extended to incorporate details of particular technologies, i.e., programming languages and their run-time support, and applications. The modelling language is Object-Z, an extension of the well-known Z specification...