The paper entitled “Multi-Objective Parameter Synthesis in Probabilistic Hybrid Systems” by Martin Fränzle, Sebastian Gerwinn, Paul Kröger (all Oldenburg), Alessandro Abate (Oxford) and Joost-Pieter Katoen has been accepted at the 13th Int. Conf. on Formal Modeling and Analysis of Timed Systems.  This paper presents a method to synthesize parameter instances (if such exist) of probabilistic hybrid automata satisfying a […]

The paper “On the Hardness of Almost-Sure Termination” by Benjamin Kaminski and Joost-Pieter Katoen has been accepted at the 40th MFCS (Mathematical Foundations in Computer Science) conference in Milano.  This paper considers the computational hardness of computing expected outcomes and deciding (universal) (positive) almost-sure termination of probabilistic programs with non-determinism.  

We are happy to announce that our tool PROPhESY: A PRObabilistic ParamEter SYnthesis has successfully passed the CAV 2015 Artifact Evaluation. The purpose of the evaluation is to provide a service by the community to help authors provide more substantial supplements to their papers so future researchers can more effectively build on and compare with […]

The paper “Conditioning in Probabilistic Programming” by Friedrich Gretz, Nils Jansen, Benjamin Kaminski, Joost-Pieter Katoen, Annabelle McIver, and Federico Olmedo has been accepted at the 31st Mathematical Foundations of Programming Semantics Conference.  The paper provides an operational and wp-semantics for an imperative probabilistic programming language with conditioning, studies their relation, and shows its usage for program […]

Friday April 24, Falak Sher successfully defended his PhD dissertation, entitled “Abstraction and Refinement of Probabilistic Automata using Modal Stochastic Games” for a jury consisting of Lijun Zhang (ISCAS Beijing, China), Stefan Kowalewski, Erich Grädel, and Joost-Pieter Katoen (all Aachen).  Falak’s dissertation is concerned with game-based abstraction-refinement in which (instead of existing works) the underlying […]

The paper “A statistical approach for timed reachability in AADL models” by Harold Bruintjes, Joost-Pieter Katoen, and David Lesens (Airbus Defense & Space) has been accepted at the IEEE/IFIP International Conference on Dependable Systems and Networks (DSN 2015, acceptance rate 21,8%). The paper presents a statistical model checker for checking timed and stochastic AADL models against […]

The paper “Model Checking of Open Interval Markov Chains” by Souymodip Chakraborty and Joost-Pieter Katoen has been accepted at the 22nd International Conference on Analytical & Stochastic Modelling Techniques & Applications (ASMTA 2015).  The paper shows that interval MCs with open intervals can be verified by re-using techniques for closed interval MCs.

Monday March 9, Jonathan Heinen successfully defended his PhD dissertation, entitled “Verification of Java Programs: A Graph Grammar Approach” for a jury consisting of Arend Rensink (Twente, NL), Thomas Seidl, Martin Grohe, and Joost-Pieter Katoen (all Aachen).  Jonathan’s dissertation deals with the automated verification of pointer operations in Java Bytecode programs using quantified LTL where […]

Carsten Kern, formerly a PhD student at Chair i2, recently obtained a Professorship at the Ostbayerische Technische Hochschule in Regensburg (Bavaria). We congratulate him with this success and wish him a lot of success in Regensburg!

On January 15, 2015, Arpit Sharma has successfully defended his dissertation on “Reduction Techniques for Nondeterministic and Probabilistic Systems”.  His defense committee consisted of Christof Löding, Holger Hermanns (Saarland University), Joost-Pieter Katoen and Bernhard Rumpe (see picture).  Arpit’s dissertation treats weighted lumpability as well as layering techniques for various models.