Titlebook: B‘98: Recent Advances in the Development and Use of the B Method; Second International Didier Bert Conference proceedings 1998 Springer-Ver

Coronary-Spasm

Composition and refinement in the B-method,ossibly introduced by composition primitives . and .. We exhibit local conditions on components which are sufficient to ensure global correctness of a software system. Finally, we show how restrictions on the architecture of software systems may guarantee these conditions.

條街道往前推

體貼

Introducing dynamic constraints in B,n different complementary ways, how a system is allowed to evolve. Such descriptions are independent of the proposed evolutions of the system, which are defined, as usual, by means of a number of operations. Some proof obligations are thus proposed in order to reconcile the two points of view. We ha

Foregery

Retrenchment: An engineering variation on refinement, describe all but a fraction of many realistic developments. An alternative notion is proposed called retrenchment, which allows information to migrate between I/O and state aspects of operations at different levels of abstraction, and which allows only a fraction of the high level behaviour to be c

大火

Synthesising structure from flat specifications, and also as a first step of the refinement process. Whilst the structuring mechanisms available in the B method are well-suited for the latter purpose, the rich type constructions of VDM are useful for the former..In this paper we propose a method which synthesises a structured B design from a flat

GNAW

An object-based approach to the B formal method, formal method. Our goal is to retain some OOM advantages and produce a flexible and reliable specification, and through the use of our example, we show how this is achieved. We prove formally that our design meets its informal specification with the help of B-Toolkit Release 3.3.1. We illustrate th

商議

neologism

Process control engineering: Contribution to a formal structuring framework with the B method, is shown how the B method can be used to define implementation independent modular specifications. Benefits are related to the re-use of verified and perennial specifications for control systems facing a fast evolution of implementation technologies. Limits are related to the compliance of formal m

嬰兒

emission

Abstract state machines: Designing distributed systems with state machines and B,ata state. The behavioural states are shown on a state diagram, whose transitions are labelled with an “event” and a B operation. The firing of a transition is synonymous with the occurrence of its associated event. We use a synchronous model of communication based on shared events which simultaneou