|
|
You can find here our publications in journals, conference proceedings,
and our technical reports.
-
A bound on the pathwidth of sparse graphs with
applications to exact algorithms.
SIAM Journal on Discrete
Mathematics, 23(1):407-427, 2009.
-
Randomized divide-and-conquer: Improved path, matching,
and packing algorithms.
SIAM Journal on Computing, 2009.
to appear.
-
Enumerate and expand: Improved algorithms for
connected vertex cover and tree cover.
Theory of Computing Systems, 43(2):234-253, 2008.
-
Reoptimization of steiner trees: Changing the terminal
set.
Theoretical Computer Science, 2008.
to appear.
-
Dynamic programming for minimum steiner
trees.
Theory of Computing Systems, 41(3):493-500, 2007.
-
The parameterized approximability of TSP with
deadlines.
Theory of Computing Systems, 41(3):431-444, 2007.
-
Parameterized power domination complexity.
Information Processing Letters, 98(4):145-149, 2006.
-
On efficient fixed parameter algorithms for Weighted
Vertex Cover.
Journal of Algorithms, 47:63-77, 2003.
-
An efficient fixed parameter algorithm for 3-hitting
set.
Journal of Discrete Algorithms, 1:89-102, 2003.
-
Fixed-parameter algorithms for closest string and
related problems.
Algorithmica, 37(1):25-42, 2003.
-
New worst-case upper bounds for MAX-2-SAT with
application to MAX-CUT.
Discrete Applied Mathematics, 130(2):139-155, 2003.
-
Stochastic finite learning of the pattern
languages.
Machine Learning, 44(1/2):67-91, 2001.
-
Learning one-variable pattern languages very
efficiently on average, in parallel, and by asking queries.
Theoretical Computer Science, 261:119-156, 2001.
-
New upper bounds for maximum
satisfiability.
Journal of Algorithms, 36:63-88, 2000.
-
A general method to speed up fixed-parameter-tractable
algorithms.
Information Processing Letters, 73:125-129, 2000.
-
A uniform framework for problems on context-free
grammars.
EATCS Bulletin, 72:169-177, October 2000.
-
An efficient automata approach to some problems on
context-free grammars.
Information Processing Letters, 74(5-6):221-227, 2000.
-
Optimal deterministic sorting and routing on grids and
tori with diagonals.
Algorithmica, (25):438-458, 1999.
-
Unambiguous computations and locally definable
acceptance types.
Theoretical Computer Science, (194):137-161, 1998.
-
Expressing uniformity via oracles.
Theory of Computing Systems, 30:355-366, 1997.
-
A simpler grammar for Fibonacci numbers.
The Fibonacci Quarterly, 34(5):465-466, November 1996.
-
Unambiguous auxiliary pushdown automata and
semi-unbounded fan-in circuits.
Information and Computation, 118(2):227-245, May 1995.
-
On optimal OROW-PRAM algorithms for computing
recursively defined functions.
Parallel
Processing Letters, 5(2):299-309, June 1995.
-
Observations on  time parallel recognition of
unambiguous context-free languages.
Information Processing Letters, 44:267-272, 1992.
-
Breaking anonymity by learning a unique minimum hitting
set.
In Proceedings of the 4th International Computer Science
Symposium in Russia (CSR), Lecture Notes in Computer Science. Springer, 2009.
to appear.
-
A new algorithm for finding trees with many
leaves.
In Proceedings of the 19th International
Symposium on Algorithms and Computation (ISAAC), number 5369 in Lecture Notes in Computer Science, pages 270-281.
Springer, 2008.
-
Improved upper bounds for partial vertex
cover.
In Proceedings of the 34th International Workshop
on Graph-Theoretic Concepts in Computer Science (WG), number 5344 in Lecture Notes in Computer Science, pages 240-251. Springer,
2008.
-
A practical approach to Courcelle's
Theorem.
In Proceedings of the 4th Doctoral Workshop on
Mathematical and Engineering Methods in Computer Science (MEMICS), pages 99-106. Z. Novotný, 2008.
-
New fixed-parameter algorithms for the minimum quartet
inconsistency problem.
In Proceedings of the 3rd International Workshop on Parameterized
and Exact Computation (IWPEC), number 5018 in Lecture Notes in Computer Science, pages 66-77. Springer,
2008.
-
Partial vs. complete domination: t-dominating
set.
In Proceedings of
the 33rd Conference on Current Trends in Theory and Practice of Informatics
(SOFSEM), number 4362 in Lecture Notes in Computer Science, pages 367-376.
Springer, 2007.
-
A faster algorithm for the Steiner tree
problem.
In Proceedings of the 23rd Symposium on
Theoretical Aspects of Computer Science (STACS), number 3884 in Lecture Notes in Computer Science, pages 561-570.
Springer, 2006.
-
Enumerate and expand: New runtime bounds for vertex
cover variants.
In Proceedings of the 12th Annual International
Computing and Combinatorics Conference (COCOON), number 4112 in Lecture Notes in Computer Science, pages 265-273.
Springer, 2006.
-
Enumerate and expand: Improved algorithms for
connected vertex cover and tree cover.
In Proceedings of the 1st International Computer Science
Symposium in Russia (CSR), number 3967 in Lecture Notes in Computer Science, pages 270-280. Springer,
2006.
-
Intuitive algorithms and t-vertex cover.
In Proceedings of the 17th International
Symposium on Algorithms and Computation (ISAAC), number 4288 in Lecture Notes in Computer Science, pages 598-607.
Springer, 2006.
-
Divide-and-color.
In Proceedings of the 32nd International Workshop
on Graph-Theoretic Concepts in Computer Science (WG), number 4271 in Lecture Notes in Computer Science, pages 58-67. Springer,
2006.
-
Reusing optimal TSP solutions for locally modified
input instances.
In G. Navarro, L. E. Bertossi, and Y. Kohayakawa, editors, TCS
2006, IFIP 19th World Computer Congress, volume 209 of IFIP, pages
251-270. Springer, 2006.
-
On the approximation hardness of some generalizations
of TSP.
In Proceedings of the 10th Scandinavian Workshop on
Algorithm Theory (SWAT), number 4059 in Lecture Notes in Computer Science, pages 184-195.
Springer, 2006.
-
D. Koschützki, K. A. Lehmann, L. Peeters, S. Richter,
D. Tenfelde-Podehl, and O. Zlotowski.
Centrality indices.
In U. Brandes and T. Erlebach, editors, Network Analysis,
volume 3418 of LNCS, pages 16-61. Springer, 2005.
-
On the parameterized complexity of exact satisfiability
problems.
In J. Jedrzejowicz and A. Szepietowski, editors, Proceedings of the 30th Conference on Mathematical Foundations of
Computer Science (MFCS), number 3618 in Lecture Notes in Computer Science, pages 568-579. Springer, 2005.
-
Algorithms based on the treewidth of sparse
graphs.
In Proceedings of the 31st International Workshop
on Graph-Theoretic Concepts in Computer Science (WG), number 3787 in Lecture Notes in Computer Science, pages 385-396. Springer,
2005.
-
Formalizing integration theory with an application to
probabilistic algorithms.
In Proc. of 17th TPHOLs, number 3223 in Lecture Notes in Computer Science, pages 271-286.
Springer, 2004.
-
Exact solutions for closest string and related
problems.
In Proceedings of the 12th International
Symposium on Algorithms and Computation (ISAAC), number 2223 in Lecture Notes in Computer Science. Springer, 2001.
-
On efficient fixed parameter algorithms for Weighted
Vertex Cover.
In Proceedings of the 11th International
Symposium on Algorithms and Computation (ISAAC), number 1969 in Lecture Notes in Computer Science, Taipei, Taiwan, 2000.
Springer.
-
Efficient algorithms for model checking pushdown
systems.
In Proc. of CAV'2000, number 1855 in Lecture Notes in Computer Science, pages 232-247.
Springer, 2000.
-
Learning from random text.
In O. Watanabe and T. Yokomori, editors, Proceedings of the 10th
International Workshop on Algorithmic Learning Theory, number
1720 in Lecture Notes in Computer Science. Springer, December 1999.
-
Upper bounds for Vertex Cover further
improved.
In Proceedings of the 16th Symposium on
Theoretical Aspects of Computer Science (STACS), number 1563 in Lecture Notes in Computer Science, pages 561-570.
Springer, 1999.
-
New upper bounds for MaxSat.
In J. Wiedermann, P. van Emde Boas, and M. Nielsen, editors, Proceedings of the 26th International Colloquium on Automata,
Languages, and Programming (ICALP), number 1644 in Lecture Notes in Computer Science, pages 575-584. Springer, July 1999.
-
Learning k-variable pattern languages efficiently
stochastically finite on average from positive date.
In V. Honavar and G. Slutzki, editors, Proceedings of the 4th
International Colloquium on Grammatical Inference, number 1433 in Lecture
Notes in Artificial Intelligence,
pages 13-24, Ames, Iowa, jul 1998. Springer.
-
An automata approach to some problems on context-free
grammars.
In C. Freksa, M. Jantzen, and R. Valk, editors, Foundations of
Computer Science: Potential--Theory--Cognition, number 1337 in Lecture Notes in Computer Science,
pages 143-152. Springer, 1997.
-
Learning one-variable pattern languages very
efficiently on average, in parallel, and by asking queries.
In M. Li and A. Maruoka, editors, Proceedings of the 8th
International Workshop on Algorithmic Learning Theory, number 1316 in
Lecture Notes in Computer Science, pages 260-276. Springer, October 1997.
-
PRAM's towards realistic parallelism:
BRAM's.
In H. Reichel, editor, Proceedings of the 10th Conference on Fundamentals of
Computation Theory, number 965 in Lecture Notes in Computer Science, pages
363-373, Dresden, Federal Republic of Germany, August 1995. Springer.
-
Optimal average case sorting on arrays.
In Proceedings of the 12th Symposium on
Theoretical Aspects of Computer Science (STACS), number 900 in Lecture Notes in Computer Science, pages 503-514.
Springer, 1995.
-
Unambiguous polynomial hierarchies and exponential
size.
In Proceedings of the 9th IEEE Symposium on
Structure in Complexity, pages 106-115, 1994.
-
Faster sorting and routing on grids with
diagonals.
In Proceedings of the 11th Symposium on
Theoretical Aspects of Computer Science (STACS), number 775 in Lecture Notes in Computer Science, pages 225-236.
Springer, 1994.
-
Expressing uniformity via oracles.
In J. Dassow and A. Kelemenova, editors, Developments in
Theoretical Computer Science: Proceedings of the International Meeting of
Young Computer Scientists. Gordon and Breach Science Publishers, 1994.
-
On the power of reading and writing simultaneously in
parallel computations.
In K. W. Ng, P. Raghavan, N. V. Balasubramanian, and F. Y. L. Chin,
editors, Proceedings of the 4th International
Symposium on Algorithms and Computation (ISAAC), number 762 in Lecture Notes in Computer Science, pages 240-249, Hong Kong,
December 1993. Springer.
-
Extended locally definable acceptance
types.
In Proceedings of the 10th Symposium on
Theoretical Aspects of Computer Science (STACS), number 665 in Lecture Notes in Computer Science, pages 473-483.
Springer, 1993.
-
On the very low complexity of deterministic 0L
languages.
In G. Rozenberg and A. Salomaa, editors, Proceedings of
Developments in Language Theory: At The Crossroads of Mathematics, Computer
Science and Biology, Turku, Finland, July 1993. World Scientific.
-
Unambiguous simulations of auxiliary pushdown automata
and circuits.
In I. Simon, editor, Proceedings of the 1st Symposium on Latin American Theoretical
Informatics (LATIN), number 583 in Lecture Notes in Computer Science, pages
387-400, São Paulo, Brazil, April 1992. Springer.
-
Parallel recognition and ranking of context-free
languages.
In I. Havel, editor, Proceedings of the 17th Conference on Mathematical Foundations of
Computer Science (MFCS), number 629 in Lecture Notes in Computer Science, pages
24-36, Prague, Czechoslavakia, August 1992. Springer.
-
The emptiness problem for intersections of regular
languages.
In I. Havel, editor, Proceedings of the 17th Conference on Mathematical Foundations of
Computer Science (MFCS), number 629 in Lecture Notes in Computer Science, pages
346-354, Prague, Czechoslavakia, August 1992. Springer.
-
The owner concept for PRAMs.
In Proceedings of the 8th Symposium on
Theoretical Aspects of Computer Science (STACS), number 480 in Lecture Notes in Computer Science, pages 172-183, Hamburg,
Federal Republic of Germany, February 1991. Springer.
-
Uniform circuits and exclusive read
PRAMs.
In S. Biswas and K. V. Nori, editors, Proceedings of
the 11th Conference on Foundations of Software Technology and Theoretical
Computer Science (FSTTCS), number 560
in Lecture Notes in Computer Science, pages 307-318, New Delhi, India, December 1991. Springer.
-
Unambiguity and fewness for logarithmic
space.
In L. Budach, editor, Proceedings of the 8th Conference on Fundamentals of
Computation Theory, number 529 in Lecture Notes in Computer Science, pages
168-179, Gosen, Federal Republic of Germany, September 1991. Springer.
-
Characterizing unambiguous augmented pushdown automata
by circuits.
In B. Rovan, editor, Proceedings of the 15th Conference on Mathematical Foundations of
Computer Science (MFCS), number 452 in Lecture Notes in Computer Science, pages
399-406, Banská Bystrica, Czechoslovakia, August 1990. Springer.
-
Derandomizing non-uniform color-coding I.
Technical Report AIB-2009-07, RWTH Aachen University, March 2009.
-
Satellites and mirrors for solving independent set on
sparse graphs.
Technical Report AIB-2009-08, RWTH Aachen University, April 2009.
-
A new algorithm for finding trees with many
leaves.
Technical Report AIB-2008-15, Dept. of Computer Science, RWTH Aachen
University, July 2008.
-
A faster algorithm for the Steiner tree
problem.
Technical Report AIB-2005-04, Dept. of Computer Science, RWTH Aachen
University, March 2005.
-
A new satisfiability algorithm with applications to
Max-Cut.
Technical Report AIB-2005-08, Dept. of Computer Science, RWTH Aachen
University, April 2005.
A short version to appear in Proc. of WG2005.
-
Maximum exact satisfiability: NP-completeness proofs
and exact algorithms.
Technical Report RS-04-19, BRICS, October 2004.
-
Parameterized power domination complexity.
Technical Report AIB-2004-09, Dept. of Computer Science, RWTH Aachen
University, December 2004.
-
Efficient algorithms for model checking pushdown
systems.
Technical Report TUM-I0002, SFB-Bericht 342/1/00 A, Technische
Universität München, Institut für Informatik, February 2000.
-
A general method to speed up fixed-parameter-tractable
algorithms.
Technical Report TUM-I9913, Institut für Informatik, Technische
Universität München,Fed. Rep. of Germany, June 1999.
Revised version to appear in Information Processing Letters.
-
An efficient fixed parameter algorithm for 3-Hitting
Set.
Technical Report WSI-99-18, WSI für Informatik, Universität
Tübingen, Fed. Rep. of Germany, October 1999.
Revised version accepted for publication in Journal of Discrete
Algorithms.
-
Learning k-variable pattern languages efficiently
stochastic finite on average from positive data.
DOI Technical Report DOI-TR-145, Department of Informatics, Kyushu
University, January 1998.
-
Upper bounds for vertex cover further
improved.
Technical Report KAM-DIMATIA Series 98-411, Faculty of Mathematics
and Physics, Charles University, Prague, November 1998.
-
New upper bounds for MaxSat.
Technical Report KAM-DIMATIA Series 98-401, Faculty of Mathematics
and Physics, Charles University, Prague, July 1998.
Extended abstract to appear at 26th International Colloquium on
Automata, Languages, and Programming (ICALP'99), Prague, July 1999.
-
Extended locally definable acceptance
types.
Technical Report WSI-96-25, Universität Tübingen, August 1996.
-
Optimal deterministic sorting and routing on grids and
tori with diagonals.
Technical Report TUM-I9629, Technische Universität München,
Institut für Informatik, July 1996.
-
Efficient learning of one-variable pattern languages
from positive examples.
DOI Technical Report DOI-TR-128, Department of Informatics, Kyushu
University, December 1996.
-
Expressing uniformity via oracles.
Technical Report 95-01, Universität Trier,
Fachbereich IV-Informatik und Mathematik, 54286 Trier, Fed. Rep. of
Germany, January 1995.
-
Faster sorting and routing on grids with
diagonals.
Technical Report TUM-I9313, SFB-Bericht Nr. 342/5/93 A, Institut
für Informatik, Technische Universität München, June 1993.
-
Optimal parallel algorithms for computing recursively
defined functions.
Technical Report TUM-I9218, SFB-Bericht Nr. 342/12/92 A, Technische
Universität München, June 1992.
-
The owner concept for PRAMs.
SFB-Bericht 342/15/90 A, I9028, Institut für Informatik, Technische
Universität München, August 1990.
-
Uniform circuits and exclusive read
PRAMs.
SFB-Bericht 342/31/90 A, I9055, Institut für Informatik, Technische
Universität München, December 1990.
-
Unambiguous Simulations of Auxiliary Pushdown
Automata and Circuits.
SFB-Bericht 342/31/90 A, I9054, Institut für Informatik, Technische
Universität München, December 1990.
-
Two Results on Unambiguous Circuits.
SFB-Bericht 342/3/90 A, I9006, Institut für Informatik, Technische
Universität München, 1990.
|