Dr. Antonis Papatsaras

The aim of the project is to investigate and extend the Event Calculus notation.
Event Calculus is a theory of communicating state machines developed
at Teesside for modelling distributed systems in B. With the help of a visual
tool we have realised the positive and negative aspects of our method. We
attempted, and in some cases succeeded, to provide alternative solutions to
some negative aspects. We compared our method with others commonly used
for event based modelling… Mehr zeigen

The aim of the project is to investigate and extend the Event Calculus notation.
Event Calculus is a theory of communicating state machines developed
at Teesside for modelling distributed systems in B. With the help of a visual
tool we have realised the positive and negative aspects of our method. We
attempted, and in some cases succeeded, to provide alternative solutions to
some negative aspects. We compared our method with others commonly used
for event based modelling, mathematical notations such as CSP and Action
Systems but also other formal notations, which are associated with diagrammatic
representations, such as Petri nets and Statecharts. We formalised the
event diagram notation by providing it with a grammar and semantics. We
then applied these formal definitions for the translation of our diagrams to B.
In our notation we are interested in the behavioural aspects of a system. We
have provided three case studies to test our notation and discuss issues such as
event synchronisation, parameter passing, and invariants. These case studies
have also proved valuable for the demonstration of our scaling techniques Weniger anzeigen

We present a case study of a simple railway system to investigate and compare two ways of modelling a system in “event driven B”. We are interested in the specification of a system as a global model as well as the formulation of a distributed state machine model where individual components exchange information by means of shared events. In this paper we investigate the issues of “parameter hiding” and “scaling” as well as the parameterisation of events of the communicating components of such… Mehr zeigen

We present a case study of a simple railway system to investigate and compare two ways of modelling a system in “event driven B”. We are interested in the specification of a system as a global model as well as the formulation of a distributed state machine model where individual components exchange information by means of shared events. In this paper we investigate the issues of “parameter hiding” and “scaling” as well as the parameterisation of events of the communicating components of such systems. We use two methods for expressing a class of components; we either create indexed B machines that can be instantiated or we represent the state of all components within a given class by means of a function. Weniger anzeigen