2019W

• Bachelor Thesis for Computer Science and Business Informatics / PR / 182.698
• Computer Engineering Practical / PR / 182.699
• Computer Engineering Project / PR / 182.758
• Doctorand's seminar / SE / 182.070
• Research Seminar LogiCS / SE / 184.767
• Scientific Project Computer Engineering / PR / 182.759
• Seminar Computer Engineering / SE / 182.757

2020S

• Introduction to Logical Methods in Computer Science / VO / 184.766
• Research Seminar LogiCS / SE / 184.767

• Tools for Concurrent and distributed Systems
  2011 – 2019 / Austrian Science Fund (FWF)
• Proof Seeding for Software Verification
  2011 – 2015 / Vienna Science and Technology Fund (WWFT)
• Asynchronous Distributed Algorithms in the Theta-Model
  2004 – 2008 / Austrian Science Fund (FWF)
• Automated proof based System and Software Engineering for Real-Time Applications
  2004 – 2008 / European Commission

2019

• Verifying Safety of Synchronous Fault-Tolerant Algorithms by Bounded Model Checking / I. Stoilkovska, I. Konnov, J. Widder, F. Zuleger / in: "International Conference on Tools and Algorithms for the Construction and Analysis of Systems", Springer, 2019, 357 - 374
• Verification of Randomized Consensus Algorithms Under Round-Rigid Adversaries / N. Bertrand, I. Konnov, M. Lazić, J. Widder / in: "30th International Conference on Concurrency Theory", Schloss Dagstuhl - Leibniz-Zentrum fuer Informatik, Germany, 2019, 33:1 - 33:15
• Communication-Closed Asynchronous Protocols / A. Damian, C. Dragoi, A. Militaru, J. Widder / in: "International Conference on Computer Aided Verification", Springer, 2019, 344 - 363

2018

• Proceedings 32nd International Symposium on Distributed Computing / U. Schmid, J. Widder / Dagstuhl Publishing LIPICS, 2018, ISBN: 978-3-95977-092-7; 736 pages
• Reachability in Parameterized Systems: All Flavors of Threshold Automata / J. Kukovec, I. Konnov, J. Widder / Talk: International Conference on Concurrency Theory (CONCUR), Bejing, China; 2018-09-04 - 2018-09-07; in: "29th International Conference on Concurrency Theory (CONCUR 2018)", Schloss Dagstuhl - Leibniz-Zentrum für Informatik GmbH, Dagstuhl Publishing, 118 (2018), ISBN: 978-3-95977-087-3; 19:1 - 19:17
• Parameterized Model Checking of Synchronous Distributed Algorithms by Abstraction / B. Aminof, I. Stoilkovska, S. Rubin, J. Widder, F. Zuleger / Talk: International Conference on Verification, Model Checking, and Abstract Interpretation (VMCAI), Los Angeles; 2018-01-07 - 2018-01-09; in: "Verification, Model Checking, and Abstract Interpretation - 19th International Conference, VMCAI 2018, Los Angeles, CA, USA, January 7-9, 2018, Proceedings", LNCS, 10747 (2018), ISBN: 978-3-319-73720-1; 1 - 24
• Communication-Closed Layers as Paradigm for Distributed Systems: A Manifesto / C. Dragoi, M. Lazić, J. Widder / Talk: Sinteza 2018 International Scientific Conference on Information Technology and Data Related Research, Belgrad, Serbien (invited); 2018-04-20; in: "Sinteza 2018 International Scientific Conference on Information Technology and Data Related Research", Singidunum University, 15 (2018), 131 - 138
• ByMC: Byzantine Model Checker / I. Konnov, J. Widder / Talk: International Symposium on Leveraging Applications of Formal Methods (ISoLA), Limasol, Zypern; 2018-11-05 - 2018-11-09; in: "ISOLA", Lecture Notes in Computer Science. Springer Verlag., 11246 (2018), ISBN: 978-3-642-34025-3; 327 - 342
• Parameterized Model Checking of Synchronous Distributed Algorithms by Abstraction / B. Aminof, S. Rubin, I. Stoilkovska, J. Widder, F. Zuleger / Talk: Verification, Model Checking, and Abstract Interpretation (VMCAI), Los Angeles; 2018-01-07 - 2018-01-09; in: "VMCAI", LNCS/Springer, 10747 (2018), 1 - 24

2017

• On the completeness of bounded model checking for threshold-based distributed algorithms: Reachability / I. Konnov, H. Veith, J. Widder / Information and Computation, 252 (2017), 95 - 109
• Para^2: Parameterized Path Reduction, Acceleration, and SMT for Reachability in Threshold-Guarded Distributed Algorithms / I. Konnov, M. Lazić, H. Veith, J. Widder / Formal Methods in System Design (invited), 51 (2017), 2; 270 - 307
• Synthesis of Distributed Algorithms with Parameterized Threshold Guards / M. Lazić, I. Konnov, J. Widder, R. Bloem / Talk: International Conference On Principles Of Distributed Systems (OPODIS), Lissabon; 2017-12-18 - 2017-12-20; in: "OPODIS", LIPIcs-Leibniz International Proceedings in Informatics, (2017), 32:1 - 32:20
• A short counterexample property for safety and liveness verification of fault-tolerant distributed algorithms / I. Konnov, M. Lazić, H. Veith, J. Widder / Talk: 44th ACM SIGPLAN Symposium on Principles of Programming Languages (POPL), Paris, France; 2017-01-18 - 2017-01-20; in: "POPL", ACM, Paris (2017), ISBN: 978-1-4503-4660-3; 719 - 734
• Accuracy of Message Counting Abstraction in Fault-Tolerant Distributed Algorithms / I. Konnov, J. Widder, F. Spegni, L. Spalazzi / Talk: Verification, Model Checking, and Abstract Interpretation (VMCAI), Paris; 2017-01-15 - 2017-01-17; in: "VMCAI 2017: Verification, Model Checking, and Abstract Interpretation", Springer, LNCS/10145/Paris (2017), ISBN: 978-3-319-52233-3; 347 - 366

2016

• Model Checking of Threshold-based Fault-Tolerant Distributed Algorithms / M. Lazić, I. Konnov, H. Veith, J. Widder / Talk: 7th Workshop on Program Semantics, Specification and Verification: Theory and Applications, St. Petersburg, Russia (invited); 2016-07-14 - 2016-07-15
• Parameterized Verification of Liveness of Distributed Algorithms / I. Konnov, M. Lazić, H. Veith, J. Widder / Talk: Workshop on Formal Reasoning in Distributed Algorithms (FRiDA), Marrakech, Marocco; 2016-05-17
• Decidability of Parameterized Verification / R. Bloem, S. Jacobs, A. Khalimov, I. Konnov, S. Rubin, H. Veith, J. Widder / ACM SIGACT News, 47 (2016), 2; 53 - 64
• What You Always Wanted to Know About Model Checking of Fault-Tolerant Distributed Algorithms / I. Konnov, H. Veith, J. Widder / Keynote Lecture: Perspectives of System Informatics: 10th International Andrei Ershov Informatics Conference, Kazan, Russland (invited); 2015-08-25 - 2015-08-27; in: "Perspectives of System Informatics: 10th International Andrei Ershov Informatics Conference, PSI 2015", LNCS / Springer, 9609 (2016), 6 - 21

2015

• Decidability of Parameterized Verification / R. Bloem, S. Jacobs, A. Khalimov, I. Konnov, S. Rubin, H. Veith, J. Widder / Morgan & Claypool Publishers, San Rafael, CA, USA, 2015, ISBN: 9781627057431; 170 pages
• Time Complexity of Link Reversal Routing / B. Charron-Bost, M Függer, L. Welch, J. Widder / ACM Transactions on Algorithms, 11 (2015), 3; 1 - 39
• SMT and POR beat Counter Abstraction: Parameterized Model Checking of Threshold-Based Distributed Algorithms / I. Konnov, H. Veith, J. Widder / Talk: International Conference on Computer Aided Verification (CAV), San Francisco, CA, USA; 2015-07-18 - 2015-07-24; in: "Computer Aided Verification", LNCS Springer, 9206 (2015), ISBN: 978-3-319-21689-8; 85 - 102

2014

• Tutorial on Parameterized Model Checking of Fault-Tolerant Distributed Algorithms / A. Gmeiner, I. Konnov, U. Schmid, H. Veith, J. Widder / in: "Formal Methods for Executable Software Models", Springer, 2014, (invited), ISBN: 978-3-319-07316-3, 122 - 171
• Approaching Verification and Validation Challenges in Smart Grids / T. Deutsch, J. Widder / Talk: Symposium Communications for Energy Systems, Wien; 2014-09-29 - 2014-10-01; in: "Tagungsband ComForEn 2014", Eigenverlag des Österreich isch en Verbandes für Elektrotec h nik, (2014), ISBN: 978-3-85133-083-0; 6 pages
• A Logic-Based Framework for Verifying Consensus Algorithms / C. Dragoi, T. Henzinger, H. Veith, J. Widder, D. Zufferey / Talk: Verification, Model Checking, and Abstract Interpretation (VMCAI), San Diego; 2014-02-19 - 2014-02-21; in: "VMCAI", Springer / LNCS, 8318 (2014), ISBN: 978-3-642-54012-7; 161 - 181
• On the Completeness of Bounded Model Checking for Threshold-Based Distributed Algorithms: Reachability / I. Konnov, H. Veith, J. Widder / Talk: International Conference on Concurrency Theory (CONCUR), Rom, Italien; 2014-09-02 - 2014-09-05; in: "CONCUR", (2014), 125 - 140
• Solvability-Based Comparison of Failure Detectors / S. Sastry, J. Widder / Talk: International Symposium on Network Computing and Applications (NCA), Boston, MA, USA; 2014-08-21 - 2014-08-23; in: "NCA", IEEE Computer Society, (2014), ISBN: 978-1-4799-5392-9; 269 - 276

2013

• Formal Verification of Distributed Algorithms (Dagstuhl Seminar 13141) / B. Charron-Bost, A. Rybalchenko, S. Merz, J. Widder / in series "Dagstuhl Reports", series editor: Schloss Dagstuhl; issued by: Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik; Schloss Dagstuhl - Leibniz-Zentrum fuer Informatik, Germany, Dagstuhl, Deutschland, 2013, ISSN: 2192-5283, 16 pages
• Link Reversal Routing with Binary Link Labels: Work Complexity / B. Charron-Bost, A. Gaillard, L. Welch, J. Widder / SIAM JOURNAL ON COMPUTING, 42 (2013), 2; 634 - 661
• Brief announcement: parameterized model checking of fault-tolerant distributed algorithms by abstraction / A. John, I. Konnov, U. Schmid, H. Veith, J. Widder / Talk: ACM SIGACT-SIGOPS Symposium on Principles of Distributed Computing (PODC), Montreal, Kanada; 2013-07-22 - 2013-07-24; in: "PODC", ACM, (2013), ISBN: 978-1-4503-2065-8; 119 - 121
• Parameterized model checking of fault-tolerant distributed algorithms by abstraction / A. John, I. Konnov, U. Schmid, H. Veith, J. Widder / Talk: International Conference on Formal Methods in Computer-Aided Design (FMCAD), Portland, OR, USA; 2013-10-20 - 2013-10-23; in: "FMCAD", (2013), ISBN: 978-0-9835678-3-7; 201 - 209
• Towards Modeling and Model Checking Fault-Tolerant Distributed Algorithms / A. John, I. Konnov, U. Schmid, H. Veith, J. Widder / Talk: International SPIN Symposium on Model Checking of Software (SPIN), Stony Brook, NY, USA; 2013-07-08 - 2013-07-09; in: "SPIN", LNCS, Springer, 7976 (2013), ISBN: 978-3-642-39175-0; 209 - 226

2012

• Parameterized Model Checking of Fault-tolerant Distributed Algorithms / A. John, I. Konnov, U. Schmid, H. Veith, J. Widder / Talk: Dagstuhl Seminar 12461: Games and Decisions for Rigorous Systems Engineering, Dagstuhl, Deutschland (invited); 2012-11-11 - 2012-11-16
• Who is afraid of Model Checking Distributed Algorithms? / A. John, I. Konnov, U. Schmid, H. Veith, J. Widder / Talk: PUMA/RISE Seminar, Goldegg; 2012-09-24 - 2012-09-28
• Who is afraid of Model Checking Distributed Algorithms? / I. Konnov, H. Veith, J. Widder / Talk: Workshop on Exploiting Concurrency Efficiently and Correctly, Berkeley, CA, USA; 2012-07-07 - 2012-07-08
• Counter Attack against Byzantine Generals / A. John, I. Konnov, U. Schmid, H. Veith, J. Widder / Talk: Alpine Verification Meeting, Passau, Bayern, Deutschland; 2012-05-21 - 2012-05-22
• Consensus in the presence of mortal Byzantine faulty processes / J. Widder, M. Biely, G. Gridling, B. Weiss, J. Blanquart / Distributed Computing, 24 (2012), 6; 299 - 321
• Wait-Free Stabilizing Dining Using Regular Registers / S. Sastry, L. Welch, J. Widder / Talk: International Conference On Principles Of Distributed Systems (OPODIS), Rom; 2012-12-17 - 2012-12-20; in: "OPODIS", LNCS / Springer, 7702 (2012), ISBN: 978-3-642-35475-5; 284 - 299
• Efficient Checking of Link-Reversal-Based Concurrent Systems / M Függer, J. Widder / Talk: International Conference on Concurrency Theory (CONCUR), Newcaslte upon Tyne, UK; 2012-09-03 - 2012-09-08; in: "CONCUR 2012 - Concurrency Theory", Lecture Notes in Computer Science. Springer Verlag., 7454 (2012), ISBN: 978-3-642-32939-5; 486 - 499

2011

• On Efficient Checking of Link-reversal-based Concurrent Systems / M Függer, J. Widder / Talk: PUMA/RISE Seminar, Traunkirchen; 2011-10-03 - 2011-10-07

2010

• In search of lost time / B. Charron-Bost, M. Hutle, J. Widder / Information Processing Letters, 110 (2010), 21; 928 - 933

2009

• Optimal Message-Driven Implementations of Omega with Mute Processes / J. Widder, M. Biely / ACM Transactions on Autonomous and Adaptive Systems., 4 (2009), 1; ?
• The Theta-Model: achieving synchrony without clocks / J. Widder, U. Schmid / Distributed Computing, 22 (2009), 1; 29 - 47
• Routing without Ordering / B. Charron-Bost, A. Gaillard, L. Welch, J. Widder / Talk: SPAA 2009 (Parallelism in Algorithms and Architectures), Calgary, Alberta, Canada; 2009-08-11 - 2009-08-13; in: "Proceedings of the Twenty-First Annual Symposium on Parallelism in Algorithms and Architectures", ACM, (2009), ISBN: 978-1-60558-606-9; 145 - 153
• Link Reversal: How to Play Better to Work Less / B. Charron-Bost, L. Welch, J. Widder / Talk: ALGOSENSORS 2009 (5th International Workshop on Algorithmic Aspects of Wireless Sensor Networks), Rhodes, Greece; 2009-07-10 - 2009-07-11; in: "Algorithmic Aspects of Wireless Sensor Networks", Springer, 5304/2008 (2009), ISBN: 9783642054334; 88 - 110

2007

• Booting Clock Synchronization in Partially Synchronous Systems with Hybrid Process and Link Failures / J. Widder, U. Schmid / in: "Distributed Computing", Springer-Verlag, 2007, 115 - 140
• Clock Synchronization in the Byzantine-Recovery Failure Model / E. Anceaume, C. Delporte-Gallet, H. Fauconnier, M. Hurfin, J. Widder / Talk: International Conference On Principles Of Distributed Systems (OPODIS), Guadeloupe; 2007-12-17 - 2007-12-20; in: "International Conference On Principles Of DIstributed System", (2007), 90 - 104
• Synchronous Consensus with Mortal Byzantines / J. Widder, G. Gridling, B. Weiss, J. Blanquart / Talk: IEEE Conference on Dependable Systems and Networks (DSN), Edinburgh; 2007-06-25 - 2007-06-28; in: "Proceedings of the 37th Annual IEEE/IFIP International Conference on Dependable Systems and Networks", (2007)
• Relating Stabilizing Timing Assumptions to Stabilizing Failure Detectors Regarding Solvability and Efficiency / M. Biely, M. Hutle, L. Penso, J. Widder / Talk: Ninth International Symposium on Stabilization, Safety, and Security of Distributed Systems (SSS 2007), Paris; 2007-11-14 - 2007-11-16; in: "stabilization", (2007)
• Tolerating Corrupted Communication / M. Biely, B. Charron-Bost, A. Gaillard, M. Hutle, A. Schiper, J. Widder / Talk: ACM Symposium on Principles of Distributed Computing, Portland; 2007-08-12 - 2007-08-15; in: "26th ACM Symposium on Principles of Distributed Computing (PODC'07)", (2007), 244 - 253

2006

• Synchronous Consensus with Mortal Byzantines / J. Widder, G. Gridling, B. Weiss, J. Blanquart / Talk: Dagstuhl Seminar 06371. From Security to Dependability, Dagstuhl (invited); 2006-09-10 - 2006-09-15
• Simulating Distributed Real-Time Systems / D. Albeseder, J. Widder / Poster: Junior Scientist Conference, Wien; 2006-04-19 - 2006-04-21; in: "Junior Scientist Conference 2006", (2006), 83 - 84
• An Efficient Test for a Transition Signalling based Up-/Down-Counter / M Függer, T. Handl, A. Steininger, J. Widder, C. Tögel / Poster: Austrochip, Wien; 2006-10-11; in: "Austrochip Mikroelektroniktagung", (2006), 55 - 62
• Optimal Message-Driven Implementations of Omega with Mute Processes / M. Biely, J. Widder / Talk: 8th International Symposium on Stabilization, Safety, and Security of Distributed Systems, Dallas; 2006-11-17 - 2006-11-19; in: "Stabilization, Safety, and Security of Distributed Systems", (2006), 110 - 121

2005

• Implementing Reliable Distributed Real Time Systems with the Theta Model / J.-F. Hermant, J. Widder / Talk: International Conference on Principles of Distributed Systems, Pisa; 2005-12-12 - 2005-12-14; in: "9th International Conference on Principles of Distributed Systems", (2005), 259 - 271
• Brief Announcement: On the Possibility and the Impossibility of Message-Driven Self-Stabilizing Failure Detection / M. Hutle, J. Widder / Talk: ACM Symposium on Principles of Distributed Computing, Las Vegas, Nevada; 2005-07-17 - 2005-07-20; in: "Proceedings of the 24th ACM Symposium on Principles of Distributed Computing", (2005), 208
• Failure Detection with Booting in Partially Synchronous Systems / J. Widder, G. Le Lann, U. Schmid / Talk: European Dependable Computing Conference, Budapest, Ungarn; 2005-04-20 - 2005-04-22; in: "Dependable Computing Conference - EDCC5", (2005), 20 - 37
• On the Possibility and the Impossibility of Message-Driven Self-Stabilizing Failure Detection / M. Hutle, J. Widder / Talk: Seventh International Symposium on Self Stabilizing Systems (SSS 2005), Barcelona, Spanien; 2005-10-26 - 2005-10-27; in: "Self Stabilizing Systems", (2005), 153 - 170
• Self-Stabilizing Failure Detector Algorithms / M. Hutle, J. Widder / Talk: IASTED International Conference on Parallel and Distributed Computing Systems, Innsbruck, Austria; 2005-02-15 - 2005-02-17; in: "IASTED International Conference on Parallel and Distributed Computing and Networks", (2005), ISBN: 0-88986-468-3; 485 - 490

2004

• VLSI Design and the Theta-Model (Kurzvorstellungen aktueller Forschung) / J. Widder / Talk: Diskussionskreis Fehlertoleranz, Berlin; 2004-11-12
• Why, Where and How to Use the Theta-Model / J. Widder / Talk: Seminaire Reflecs in INRIA Rocquencourt, Frankreich, INRIA Rocquencourt, Frankreich (invited); 2004-03-10
• The Theta-Model, and how to Boot Clock Synchronization in it / J. Widder / Talk: Seminaire Reflecs in INRIA Rocquencourt, Frankreich, INRIA Rocquencourt, Frankreich (invited); 2004-02-10
• Distributed Computing in the Presence of Bounded Asynchrony / PhD Thesis by J. Widder / Supervisor, Reviewer: U. Schmid, M. Jazayeri; Institut für Technische Informatik / Embedded Computing Systems, 2004
• On the Possibility and the Impossibility of Time Free Self-Stabilizing Failure Detection / M. Hutle, J. Widder / Report for Research Report 34/2004, Technische Universität Wien, Institut für Technische Informatik, Treitlstraße 3, A-1040 Vienna, Austria; 2004
• Time Free Self-Stabilizing Local Failure Detection / M. Hutle, J. Widder / Report for Research Report 33/2004, Technische Universität Wien, Institut für Technische Informatik, Treitlstraße 3, A-1040 Vienna, Austria; 2004
• Implementing Time Free Designs for Distributed Real-Time Systems (A Case Study) / J.-F. Hermant, J. Widder / Report for Research Report 23/2004, Technische Universität Wien, Institut für Technische Informatik, Treitlstraße 3, A-1040 Vienna, Austria (Joint research report with INRIA Rocquencourt, France); 2004

2003

• Booting clock synchronization in partially synchronous systems. / J. Widder / Talk: International Conference on Distributed Computing Systems, Sorrento, Italy; 2003-10-01 - 2003-10-03; in: "Proceedings of the 17th International Symposium on Distributed Computing ", (2003), 121 - 135
• Perfect failure detection with booting in partially synchronous systems / J. Widder, G. Le Lann, U. Schmid / Report for Technical Report 183/1-131, Department of Automation, Technische Universität Wien; 2003
• Booting clock synchronization in partially synchronous systems with hybrid node and link failures. / J. Widder, U. Schmid / Report for Technical Report 183/1-126, Department of Automation, Technische Universität Wien; 2003

• FIT-IT Embedded Systems Dissertationsstipendium "Distributed Computing in the Presence of Bounded Asynchrony" / Austria / 2004

Soon, this page will include additional information such as reference projects, activities as journal reviewer and editor, memberships in councils and committees, and other research activities.

Until then, please visit Josef Widder’s research profile in TISS .