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Professional Activities
- Member of the IFIP Working Group 1.2 on "Descriptional Complexity"
- 10/2017 - 9/2023 Chair of the IFIP Working Group 1.2 on "Descriptional Complexity"
- Member of the IFIP Working Group 1.5 on "Cellular Automata and Discrete Complex Systems"
- Member of the Steering Committee of Descriptional Complexity of Formal Systems (DCFS)
- 10/2017 - 9/2023 Chair of the Steering Committee of Descriptional Complexity of Formal Systems (DCFS)
- Member of the Steering Committee of International Conference on Developments in Language Theory (DLT 2018)
- Member of the Steering Committee of
Non-Classical Models of Automata and Applications (NCMA)
- Editor-in-Chief of
Journal of Automata, Languages and Combinatorics
- Member of the Editorial Board of
International Journal of Foundations of Computer Science
- Member of the Editorial Board of
Journal of Cellular Automata
- Honorary Editor of
International Journal of Unconventional Computing
- Editor of
Reversible Computation, LNCS 13960, Springer 2023
- Guest Editor of the special issue
International Journal of Foundations of Computer Science 32(4), 2021
- Guest Editor of the special issue
Natural Computing 19(4), 2020
- Editor of
Cellular Automata and Discrete Complex Systems, LNCS 10875, Springer 2018
- Guest Editor of the special issue
Journal of Automata, Languages and Combinatorics 21(1-2), 2016
- Guest Editor of the special issue
International Journal of Foundations of Computer Science 26(7), 2015
- Guest Editor of the special issue
Journal of Cellular Automata 9(5-6), 2014
- Editor of
Implementation and Application of Automata, LNCS 8587, Springer 2014
- Editor of
Cellular Automata and Discrete Complex Systems, LNCS 8155, Springer 2013
- Guest Editor of the special issue
Journal of Automata, Languages and Combinatorics 17(2-4), 2012
- Editor of
Descriptional Complexity of Formal Systems, LNCS 7386, Springer 2012
- Editor of
Languages Alive. Essays Dedicated to Jürgen Dassow on the Occasion of His 65th Birthday, LNCS 7300, Springer 2012
- Guest Editor of the special issue
Theoretical Computer Science Volume 449, 2012
- Guest Editor of the special issue
Journal of Automata, Languages and Combinatorics 16(2-4), 2011
- Editor of
Descriptional Complexity of Formal Systems, LNCS 6808, Springer 2011
- Guest Editor of the special issue
Fundamenta Informaticae 112(2-3), 2011
- Guest Editor of the special issue
Fundamenta Informaticae 104(1-2), 2010
- Guest Editor of the special issue
IEICE Transactions on Information and Systems E87-D(3), 2004
- Guest Editor of the special issue
Fundamenta Informaticae 58(3), 2003
- Guest Editor of the special issue Parallel Computing 23(11), 1997
- Director of Institut für Informatik, Universität Giessen, Germany
- 2000-2015 Chair and Vice Chair of the
Working Group "Automaten und Formale Sprachen" of the German Computer Science Society GI
(Gesellschaft für Informatik)
Organization of Workshops and Conferences
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15th Conference on Reversible Computation (RC 2023)
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Workshop on Reversibility in Programming, Languages, and Automata (RPLA 2019)
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19th International Conference on Implementation and Application of Automata (CIAA 2014)
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19th International Workshop on Cellular Automata and Discrete Complex Systems (AUTOMATA 2013)
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14th International Workshop on Descriptional Complexity of Formal Systems (DCFS 2012)
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13th International Workshop on Descriptional Complexity of Formal Systems (DCFS 2011)
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2. Workshop on Non-Classical Models of Automata and Applications (NCMA 2010)
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1. Workshop on Non-Classical Models of Automata and Applications (NCMA 2009)
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18. GI-Theorietag, Automaten und Formale Sprachen, 2008
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2. Workshop on Non-Classical Models of Automata and Applications (NCMA 2010)
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FORMAT-Workshop Sommer 2004
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FORMAT-Workshop in cooperation with IFIP Working Group 1.2
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International IFIP Cellular Automata Workshop
- Interdisziplinärer Workshop: "Informatik an der JLUG"
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5. GI-Theorietag, Automaten und Formale Sprachen
Talks
- Cellular Automata: From Black-and-White to High Gloss Color,
Developments in Language Theory (DLT 2024),
Göttingen, Germany, August 2024
- Cellular Automata: Communication Matters,
Computability in Europe (CIE 2024),
Amsterdam, The Netherlands, July 2024
- Sweeping Input-Driven Pushdown Automata,
Implementation and Application of Automata (CIAA 2023),
Famagusta, North Cyprus, September 2023
- Deterministic Real-Time Tree-Walking-Storage Automata,
Non-Classical Models for Automata and Applications (NCMA 2023),
Famagusta, North Cyprus, September 2023
- Tree-Walking-Storage Automata,
Developments in Language Theory (DLT 2023),
Umeå, Sweden, June 2023
- State Complexity of Finite Partial Languages,
Descriptional Complexity of Formal Systems (DCFS 2022),
Debrecen, Hungary, August 2022
- Syntax Checking Either Way,
Implementation and Application of Automata (CIAA 2022),
Rouen, France, June 2022
- Reversible Top-Down Syntax Analysis,
Developments in Language Theory (DLT 2021),
Porto, Portugal, August 2021
- One-Dimensional Pattern Generation by Cellular Automata,
International Conference on Cellular Automata for Research and Industry (ACRI 2020),
Łódź, Poland, December 2020
- Kernels of Sub-Classes of Context-Free Languages,
Current Trends in Theory and Practice of
Informatics (SOFSEM 2020),
Limassol, Cyprus, January 2020
- Input-Driven Multi-Counter Automata,
Implementation and Application of Automata (CIAA 2019),
Košice, Slovakia, July 2019
- Digging Input-Driven Pushdown Automata,
Non-Classical Models for Automata and Applications (NCMA 2019),
Valencia, Spain, July 2019
- Iterative Arrays with Self-Verifying Communication Cell,
Workshop on Cellular Automata and Discrete Complex Systems (AUTOMATA 2019),
Guadalajara, Mexico, June 2019
- AUTOMATA 25 - A Workshop Turned 24,
Workshop on Cellular Automata and Discrete Complex Systems (AUTOMATA 2019),
Guadalajara, Mexico, June 2019
- Two-Sided Strictly Locally Testable Languages,
Non-Classical Models for Automata and Applications (NCMA 2017),
Prague, Czech Republic, August 2017
- One-Time Nondeterministic Computations,
Descriptional Complexity of Formal Systems (DCFS 2017),
Milan, Italy, July 2017
- Reversibility in Finite-State Devices,
Computability in Europe (CiE 2017),
Turku, Finland, June 2017
- Cutting the Firing Squad Synchronization,
International Conference on Cellular Automata for Research and Industry (ACRI 2016),
Fez, Morocco, September 2016
- Deterministic Stack Transducers,
Implementation and Application of Automata (CIAA 2016),
Seoul, South Korea, July 2016
- Reversibility in Finite-State Devices,
Formal Languages and Automata: Models, Methods and Applications (FLA 2016),
Naples, Italy, January 2016
- Reversible Computations,
Colloquium, University of Debrecen, Debrecen, Hungary,
October 2015
- Tinput-Driven Pushdown Automata,
Machines, Computations and Universality (MCU 2015),
Famagusta, Cyprus, September 2015
- Reversible and Irreversible Computations of Deterministic Finite-State Devices,
Mathematical Foundations of Computer Science (MFCS 2015),
Milan, Italy, August 2015
- Measuring Communication in Automata Systems,
Developments in Language Theory (DLT 2014),
Ekaterinburg, Russia, August 2014
- Complexity of One-Way Cellular Automata,
International Workshop on Cellular Automata and Discrete Complex Systems (AUTOMATA 2014),
Himeji, Japan, July 2014
- Complexity of Operation Problems,
Computability in Europe (CiE 2014),
Budapest, Hungary, June 2014
- Complexity of Cellular Automata Computations,
Voices of Cante. Final Act,
Porto, Portugal, January 2014
- Reversible Automaten - Kommen wir wieder zurück?,
KIK - Kasseler Informatik-Kolloquium,
Kassel, January 2014
- One-Way Multi-Head Finite Automata with Pebbles But No States,
Developments in Language Theory (DLT 2013),
Marne-la-Vallée, France, June 2013
- Iterative Arrays: Little Resources Big Size Impact,
Cellular Automata for Research and Industry (ACRI 2012),
Santorini Island, Greece, September 2012
- Bidirectional String assembling Systems,
Non-Classical Models for Automata and Applications (NCMA 2012),
Fribourg, Switzerland, August 2012
- States and Heads Do Count For Unary Multi-Head Finite Automata,
Developments in Language Theory (DLT 2012),
Taipei, Taiwan, August 2012
- On the Descriptional Complexity of the Window Size for Deterministic Restarting Automata,
Conference on Implementation and Application of Automata (CIAA 2012),
Porto, Portugal, July 2012
- One-Way Reversible Multi-Head Finite Automata,
Workshop on Reversible Computation (RC 2012),
Copenhagen, Denmark, July 2012
- Oblivious Two-Way Finite Automata: Decidability and Complexity,
Latin American Symposium on Theoretical Informatics (LATIN 2012),
Arequipa, Peru, April 2012
- String Assembling Systems,
Non-Classical Models of Automata and Applications (NCMA 2011),
Milan, Italy, July 2011
- Nondeterministic State Complexity of Star-Free Languages,
Conference on Implementation and Application of Automata (CIAA 2011),
Blois, France, July 2011
- Nature-Based Problems in Cellular Automata,
Computability in Europe (CiE 2011) - Special Session on Natural Computing,
Sofia, Bulgaria, June 2011
- Measuring Communication in Cellular Automata,
Symposium on Cellular Automata - Journées Automates Cellulaires (JAC 2010),
Turku, Finland, December 2010
- Cellular Automata and the Quest for Artificial Self-Reproducing Structures,
International Conference on Membrane Computing (CMC11),
Jena, Germany, August 2010
- The Magic Number Problem for Subregular Language Families,
Descriptional Complexity of Formal Systems (DCFS 2010),
Saskatoon, Canada, August 2010
- Reversible Pushdown Automata,
International Conference on Language and Automata Theory
and Applications (LATA 2010),
Trier, Germany, May 2010
- Cellular Automata and Language Theory,
International Workshop on Cellular Automata and Discrete Complex Systems (AUTOMATA 2009),
São José dos Campos, Brazil, October 2009
- Cellular Automata With Sparse Communication,
Conference on Implementation and Application of Automata (CIAA 2009),
Sydney, Australia, July 2009
- Undecidability of Operation Problems for T0L Languages and
Subclasses,
Language and Automata Theory and Applications (LATA 2009),
Tarragona, Spain, April 2009
- Descriptional Complexity of Restarting Automata,
ABCDays on List Automata, Forgetting Automata, and Restarting Automata,
Prague, Czech Republic, March 2009
- Multi-Head Finite Automata: Characterizations, Concepts
and Open Problems Subregular Language Families,
The Complexity of Simple Programs (CSP 2008),
Cork, Ireland, December 2008
- State Complexity of NFA to DFA Conversion for
Subregular Language Families,
Descriptional Complexity of Formal Systems (DCFS 2008),
Charlottetown, Prince Edward Island, Canada, July 2008
- Real-Time Reversible Language Recognition
by Cellular Automata,
Theory and Applications of Cellular Automata (AUTOMATA 2008),
Bristol, UK, June 2008
- Real-Time Reversible Iterative Arrays,
Fundamentals of Computation Theory (FCT 2007),
Budapest, Hungary, August 2007
- Optimal Simulations of Weak Restarting Automata,
Descriptional Complexity of Formal Systems (DCFS 2007),
High Tatras, Slovakia, July 2007
- Hairpin Finite Automata,
Developments in Language Theory (DLT 2007),
Turku, Finland, July 2007
- Fast Reversible Language Recognition Using Cellular Automata,
Language and Automata Theory and Applications (LATA 2007),
Tarragona, Spain, April 2007
- Succinct Description of Regular Languages by Weak Restarting Automata,
Language and Automata Theory and Applications (LATA 2007),
Tarragona, Spain, April 2007
- Fast Iterative Arrays with Restricted Inter-Cell
Communication: Computational Capacity,
16. GI-Theorietag, Automaten und Formale Sprachen,
Vienna, Austria,
September 2006
- Computational Capacity and Descriptional Complexity of
Communication-Restricted Cellular Automata,
International Workshop on Unconventional Computing and Cellular Automata,
Hiroshima, Japan,
September 2006
- Fast Iterative Arrays with Restricted Inter-Cell
Communication: Computational Capacity,
IFIP International Conference on Theoretical Computer Science (IFIP TCS2006).
IFIP World Computer Congress,
Santiago de Chile, Chile, August 2006
- Finite Turns and the Regular Closure of Linear Languages,
15. GI-Theorietag, Automaten und Formale Sprachen,
Lauterbad, September 2005
- Fast Iterative Arrays with Restricted Inter-Cell
Communication: Computational Capacity,
International Workshop on Cellular Automata,
Gdansk, Poland,
September 2005
- Revolving-Input Finite Automata,
Developments in Language Theory (DLT 2005),
Palermo, Italy,
July 2005
- Descriptional Complexity of Deterministic Restarting Automata,
Descriptional Complexity of Formal Systems (DCFS 2005),
Como, Italy,
June 2005
- Finite Turns and the Regular Closure of Linear Languages,
FORMAT-Workshop,
Würzburg, November 2005
- The Boolean Closure of Linear Context-Free Languages,
Developments in Language Theory VIII (DLT 2004),
Auckland, New Zealand,
December 2004
- Flip-Pushdown Automata,
FORMAT-Workshop,
Kassel, November 2004
- Register Complexity of LOOP-, WHILE-, and GOTO-Programs,
14. GI-Theorietag, Automaten und Formale Sprachen,
Caputh, September 2004
- Register Complexity of LOOP-, WHILE-, and GOTO-Programs,
Machines, Computations and Universality (MCU 2004),
St. Petersburg, Russia, September 2004
- The Phenomenon of Non-Recursive Trade-Offs,
Descriptional Complexity of Formal Systems (DCFS 2004),
London, Ontario, Canada, July 2004
- Some Non-Semi-Decidability Problems for Linear and Deterministic
Context-Free Languages,
Conference on Implementation and Application of Automata (CIAA 2004),
Kingston, Ontario, Canada, July 2004
- Self-Assembling Finite Automata and Grammars with Scattered Nonterminals,
FORMAT-Workshop,
Frankfurt, February 2004
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On the Descriptional Power of Heads, Counters, and Pebbles,
13. GI-Theorietag, Automaten und Formale Sprachen,
Herrsching, Oktober 2003
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One-Way Cellular Language Acceptors - A Survey,
International IFIP Workshop on Cellular Automata,
Leuven, Belgium,
September 2003
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Dimension and Time Hierarchies for Small Time Bounds,
Fundamentals of Computation Theory 2003 (FCT 2003),
Malmö, Sweden,
August 2003
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On the Descriptional Power of Heads, Counters, and Pebbles,
Descriptional Complexity of Formal Systems (DCFS 2003),
Budapest, Hungary,
July 2003
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Flip-Pushdown Automata: Nondeterminism is Better Than Determinism,
Developments in Language Theory VII (DLT 2003),
Szeged, Hungary,
July 2003
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Self-Assembling Finite Automata and Grammars with Scattered Nonterminals,
Colloquium, University of Metz,
Metz, France,
February 2003
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Self-Assembling Finite Automata,
12. GI-Theorietag, Automaten und Formale Sprachen,
Wittenberg,
September 2002
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Unary Language Operations and Their Nondeterministic State Complexity,
Developments in Language Theory VI (DLT 2002),
Kyoto, Japan,
September 2002
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Bounded Cellular Automata with Bounded Nondeterminism,
International IFIP Workshop on Cellular Automata,
Prague, Czech Republic,
September 2002
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Self-Assembling Finite Automata,
International Computing and Combinatorics Conference (COCOON 2002),
Singapore,
August 2002
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Zustandskomplexität einfacher Operationen auf NFAs,
11. GI-Theorietag, Automaten und Formale Sprachen,
Wendgräben,
October 2001
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The Fault Tolerant Early Bird Problem,
International IFIP Workshop on Cellular Automata,
Porquerolles, France,
September 2001
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A Time Hierarchy for Bounded One-Way Cellular Automata,
Mathematical Foundations of Computer Science (MFCS 2001),
Marianske Lazne, Czechia, August 2001
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Improving Raster Image Run-Length Encoding Using Data Order,
Conference on Implementation and Application of Automata (CIAA 2001),
Pretoria, South Africa, July 2001
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Refining Nondeterminism Below Linear-Time,
Descriptional Complexity of Automata, Grammars and
Related Structures (DCAGRS 2001),
Vienna, Austria,
July 2001
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Efficient Universal Pushdown Cellular Automata and their Application
to Complexity,
Universal Machines and Computations (MCU 2001),
Chisinau, Moldova,
May 2001
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Zeit, Dimension, Nichtdeterminismus: Hierarchien zwischen
Real- und Linearzeit,
Technische Universität München,
Munich,
February 2001
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Deterministische Turingmaschinen mit kleinen Zeitschranken,
FORMAT-Workshop,
Darmstadt,
December 2000
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Zellularautomaten - ein paralleles Berechnungsmodell,
Colloquium, University of Hannover,
Hannover,
November 2000
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Fault tolerant parallel pattern recognition,
International Conference on Cellular Automata for Research and
Industry (ACRI 2000),
Karlsruhe,
October 2000
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Deterministische Turingmaschinen zwischen Real- und Linearzeit,
10. GI-Theorietag, Automaten und Formale Sprachen,
Vienna, Austria,
September 2000
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Iterative arrays with small time bounds,
Mathematical Foundations of Computer Science (MFCS 2000),
Bratislava, Slovakia,
September 2000
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How small time bounds, dimensions and the amount of nondeterminism
interact in iterative arrays,
International IFIP Workshop on Cellular Automata,
Osaka, Japan,
August 2000
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Real-time language recognition by alternating cellular automata,
IFIP International Conference on Theoretical Computer Science (IFIP TCS2000),
Sendai, Japan,
August 2000
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Deterministische Turingmaschinen zwischen Real- und Linearzeit,
41. Workshop über Komplexitätstheorie, Datenstrukturen und
Effiziente Algorithmen,
Lübeck,
June 2000
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Iterative arrays with limited nondeterministic communication cell,
International Colloquium on Words, Languages and Combinatorics (ICWLC'00),
Kyoto, Japan,
March 2000
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Synchronisation und Zeitberechenbarkeit von Funktionen in
Zellularautomaten,
Colloquium, University of Kassel,
Kassel,
December 1999
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Zellularautomaten - ein paralleles Berechnungsmodell,
Colloquium, University of Frankfurt,
Frankfurt,
December 1999
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Real-time language recognition by alternating cellular automata,
International IFIP Workshop on Cellular Automata,
Lyon, France,
October 1999
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Kontextfreie Sprachen und Polyautomaten,
9. GI-Theorietag, Automaten und Formale Sprachen,
Schauenburg-Elmshagen,
September 1999
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Iterative arrays with a wee bit alternation,
Fundamentals of Computation Theory (FCT'99),
Iasi, Romania,
September 1999
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On tally languages and generalized interacting automata,
Developments in Language Theory IV (DLT'99),
Aachen,
July 1999
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Alternierende Realzeit-Zellularautomaten,
FORMAT-Workshop,
Rauischholzhausen,
April 1999
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Komplexität von Algorithmen,
Antrittsvorlesung,
April 1999
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Sticker-Systeme,
Habilitationsvortrag, University of Giessen,
February 1999
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On unary languages acceptable by cellular devices,
Automata'98 (Workshop on Cellular Automata),
Santiago, Chile,
December 1998
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Nichtdeterminismus in zellularen Sprachakzeptoren,
FORMAT-Workshop,
Frankfurt,
October 1998
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Eingeschränkter Nichtdeterminismus in Zellularautomaten,
8. GI-Theorietag, Automaten und Formale Sprachen,
Riveris,
September 1998
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One guess one-way cellular arrays,
Mathematical Foundations of Computer Science (MFCS'98),
Brno, Czechia,
August 1998
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