## Milan Hutten: Sound and Complete Axiomatizations for the rooted variants of Divergence-Preserving, Weak Divergence-Preserving and Stability-Respecting Branching Bisimilarity

This thesis studies divergence and the extra complexity it adds to branching bisimilarity and axiomatizations with respect to branching bisimilarity. Aceto et al. provided sound and complete axiomatization with respect to rooted branching bisimilarity over basic CCS with the prefix iteration operator. Additionally, Spaninks, and Liu and Yu proposed sound and complete axiomatizations with respect *…continue reading*

## Kevin Jilissen: A formal analysis of the tunnel control systems of the Rijkswaterstaat GITO

On Monday, August 29, at 15:00 in MF13 Kevin Jilissen defends his master thesis called A formal analysis of the tunnel control systems of the Rijkswaterstaat GITO.

## Floris Zeven: Spatial Model Checking with mCRL2

Image analysis using spatial model checking is a relatively recent approach that has promising applications in the medical field. We investigated whether it is possible to verify spatial proper- ties using the mCRL2 toolset, which was built to verify concurrent systems and protocols. This was achieved by translating Spatial Logic for Closure Spaces (SLCS) formulae *…continue reading*

## Dennis Rizvić: Making MCA easily understandable with mCRL2

A model of multicopy semantics of low level memory operations is made in mCRL2. These memory operations can be relaxed, release, acquire and sequentially consistent, which determine whether these operations can be executed before or after surrounding instructions. Using this model it is investigated which semantics the read and write operations of Peterson’s mutual exclusion algorithm must have to work *…continue reading*

## Koen Degeling: New algorithms and heuristics for solving Variability Parity Games

Variability parity games are a recently proposed extension to well-known parity games that allow for verification of software product lines (SPLs). We propose new algorithms for solving variability parity games based on the existing priority promotion and SCC decomposition, and provide new heuristics for VPGs. We implemented these proposed algorithms, as well as an algorithm *…continue reading*

## Tom Buskens: Optimizing the code generator for OIL

OIL, short for Open Interaction Language, is a domain-specific language developed by Canon Production Printing B.V. It is a language that can be used for specifying, analyzing, and implementing models of system behavior. The tooling created for OIL can generate C++ code from OIL specifications. Part of this generated code is a scheduler that schedules *…continue reading*

## Anneke Huijsmans: Optimising parity game solvers using dynamic SCC maintenance

Two optimizations for Zielonka’s recursive algorithm for solving parity games are investigated. The first optimization is partial re-decomposition, in which only the part of the graph containing vertices of SCCs which have 1 or more vertices removed will be re-decomposed. The second optimization is dynamic SCC maintenance, which builds an SCC tree for each SCC *…continue reading*

## Jasper Stam: Formal verification of an industrial PLC program in Function Block Diagram and Structured Text

At Vitens, the biggest drinking water company from the Netherlands, most processes in extracting, purifying and delivering drinking water are automated using PLCs. In order to check PLC programs, translation schemes for the programming languages Function Block Diagram and Structured Text are defined into an SMT solver. Using the SMT solver, a set of typical *…continue reading*

## Geert van Ieperen: Visualisation of large Labelled Transition Systems

A formal model describes the behaviour of a program, protocol or other system. The properties of this model can be verified, such that we can prove these properties with absolute certainty. Visualising the state space of a formal model is an important tool for their development. This thesis focuses on visualising such a state space *…continue reading*

## Wouter Schols: Verification of an iterative implementation of Tarjan’s algorithm for Strongly Connected Components using Dafny

Tarjan’s algorithm for strongly connected components is used in the mCRL2 toolset. This algorithm finds all strongly connected components or SCC in a directed graph. Here an SCC is a maximal set of nodes such that there exists a directed path between all nodes in the set. The normal implementation of Tarjan’s algorithm uses recursion. *…continue reading*