Miguel Felder

Foundations of Object-Oriented Modeling Notations in a Dynamic Logic Framework

The Unified Modeling Language UML is a language for specifying object-oriented systems. It is a standard in the domain of object-oriented analysis and design. Due to the missing formal foundation of the UML the syntax and the semantics of a number of UML costructs are not precisely defined.

Automatic verification of real-time designs

We are working on an automatic approach to verify real-time distributed designs for complex timing requirements which go beyond schedulability. We focus our analysis on designs which adhere to the hypothesis of known analytical theory for fixed-priority scheduling. Unlike previous formal approaches, we profit from that theory and build rather simple and tractable formal models based on Timed Automata. Therefore, we are integrating scheduling analysis techniques into the framework of automatic formal verification.

A dynamic logic model for the formal foundation of object-oriented analysis and design

The authors present an object-oriented conceptual model representing the information acquired during object-oriented analysis and design. It fulfills the three requirements for conceptual models: formality, usability and flexibility. The proposed conceptual model integrates both of the levels in the architecture of modeling notations (i.e. model and metamodel levels) into a single conceptual framework based on dynamic logic. This way, the formal model allows the specification of interconnections between the two different levels. This integration is particularly useful for the description of evolution of system specification (e.g. evolution of business rules). For example, it is possible to specify how a modification made to a model impacts on the modeled system.