TCS / Research / Publications / Journal Articles
Helsinki University of Technology, 
     Laboratory for Theoretical Computer Science

Journal Articles

to appear

118Zahra Ahmadian, Javad Mohajeri, Mahmoud Salmasizadeh, Risto Hakala, and Kaisa Nyberg. A practical distinguisher for the Shannon cipher. Journal of Systems and Software, to appear.
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117Harri Haanpää, André Schumacher, and Pekka Orponen. Distributed algorithms for lifetime maximization in sensor networks via min-max spanning subgraphs. Wireless Networks, to appear.
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2010

116Billy Bob Brumley and Kimmo U. Järvinen. Conversion algorithms and implementations for Koblitz curve cryptography. IEEE Transactions on Computers, 59(1):81–92, January 2010.
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2009

115Tomi Janhunen, Emilia Oikarinen, Hans Tompits, and Stefan Woltran. Modularity aspects of disjunctive stable models. Journal of Artificial Intelligence Research, 35:813–857, August 2009.
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114Antti E. J. Hyvärinen, Tommi Junttila, and Ilkka Niemelä. Incorporating clause learning in grid-based randomized SAT solving. Journal on Satisfiability, Boolean Modeling and Computation, 6:223–244, 2009.
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113Emilia Oikarinen and Tomi Janhunen. A translation-based approach to the verification of modular equivalence. Journal of Logic and Computation, 19(4):591–613, 2009.
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112Harri Haanpää, André Schumacher, and Pekka Orponen. Distributed algorithms for lifetime maximization in sensor networks via min-max spanning subgraphs. Wireless Networks, 2009. To appear.
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111Jani Suomalainen, Jukka Valkonen, and N. Asokan. Standards for security associations in personal networks: a comparative analysis. International Journal of Security and Networks (IJSN), 4(1/2):87–100, 2009.
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110Matti Järvisalo. Structure-based satisfiability checking: Analyzing and harnessing the potential. AI Communications, 22(2):117–119, 2009. Thesis summary.
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109Matti Järvisalo and Tommi Junttila. Limitations of restricted branching in clause learning. Constraints, 14(3):325–356, 2009.
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108Risto Hakala and Kaisa Nyberg. A multidimensional linear distinguishing attack on the Shannon cipher. International Journal of Applied Cryptography, 1(3):161–168, 2009.
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107Sven Laur and Sylvain Pasini. User-aided data authentication. International Journal of Security and Networks, 4(1/2):69–86, 2009.
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2008

106Mikko Alava, John Ardelius, Erik Aurell, Petteri Kaski, Supriya Krishnamurthy, and Pekka Orponen. Circumspect descent prevails in solving random constraint satisfaction problems. Proceedings of the National Academy of Sciences (USA), 105(40):15253–15257, October 2008.
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105Supriya Krishnamurthy, Sameh El-Ansary, Erik Aurell, and Seif Haridi. An analytical study of a structured overlay in the presence of dynamic membership. IEEE/ACM Transactions on Networking, 16:814–825, 2008.
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104Emilia Oikarinen and Tomi Janhunen. Achieving compositionality of the stable model semantics for smodels programs. Theory and Practice of Logic Programming, 8(5–6):717–761, 2008.
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103Harri Haanpää, Patric Östergård, and Sándor Szabó. Small -groups with full-rank factorization. International Journal of Algebra and Computation, 18(6):1019–1034, 2008.
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102Victor Marek, Ilkka Niemelä, and Mirosław Truszczyński. Programs with monotone abstract constraint atoms. Theory and Practice of Logic Programming, 8(2):167–199, 2008.
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101Gerd Brewka, Ilkka Niemelä, and Mirosław Truszczyński. Preferences and nonmonotonic reasoning. AI Magazine, 29(4):69–78, 2008.
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100Ilkka Niemelä. Stable models and difference logic. Annals of Mathematics and Artificial Intelligence, 53(1–4):313–329, 2008.
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99Jukka Valkonen and Kaisa Nyberg. Uudet salausmenetelmät parantavat yksityisyydensuojaa. Tietosuoja, 4:24–27, 2008. In Finnish.
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98Matti Järvisalo and Emilia Oikarinen. Extended ASP tableaux and rule redundancy in normal logic programs. Theory and Practice of Logic Programming, 8(5–6):691–716, 2008.
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97Matti Järvisalo and Ilkka Niemelä. The effect of structural branching on the efficiency of clause learning SAT solving: An experimental study. Journal of Algorithms, 63(1–3):90–113, 2008.
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96Petteri Kaski, Patric R. J. Östergård, Svetlana Topalova, and Rosen Zlatarski. Steiner triple systems of order 19 and 21 with subsystems of order 7. Discrete Mathematics, 308(13):2732–2741, 2008.
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2007

95Tomi Janhunen and Emilia Oikarinen. Automated verification of weak equivalence within the smodels system. Theory and Practice of Logic Programming, 7(6):697–744, November 2007.
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94Philippe Dumas, Helger Lipmaa, and Johan Wallén. Asymptotic behaviour of a non-commutative rational series with a nonnegative linear representation. Discrete Mathematics and Theoretical Computer Science, 9(1):247–274, 2007.
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93Harri Haanpää and Patric R. J. Östergård. Sets in Abelian groups with distinct sums of pairs. Journal of Number Theory, 123:144–153, 2007.
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92Pekka Orponen. "P = NP" -ongelma ja laskennan vaativuusteoria. Tietojenkäsittelytiede, 26:54–67, 2007.
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91Satu Elisa Schaeffer. Graph clustering. Computer Science Review, 1(1):27–64, 2007.
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90Kaisa Nyberg. Kryptologia – tiedon turvaamisen tiede. Tietojenkäsittelytiede, 26:32–53, Heinäkuu 2007.
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2006

89Marco Bozzano, Roberto Bruttomesso, Alessandro Cimatti, Tommi Junttila, Silvio Ranise, Peter van Rossum, and Roberto Sebastiani. Efficient theory combination via boolean search. Information and Computation, 204(10):1493–1525, October 2006.
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88Tomi Janhunen. Some (in)translatability results for normal logic programs and propositional theories. Journal of Applied Non-Classical Logics, 16(1–2):35–86, June 2006. Special issue on implementation of logics.
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87Malcolm Greig, Harri Haanpää, and Petteri Kaski. On the coexistence of conference matrices and near resolvable 2-(2k+1, k, k-1) designs. Journal of Combinatorial Theory, Series A, 113(4):703–711, May 2006.
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86Stefano Marinoni and Hannu H. Kari. Ad hoc routing protocol performance: a realistic simulation based study. Telecommunication Systems, 33(1-3):269–289, 2006.
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85Harri Haanpää and Patric R. J. Östergård. Steinerin kolmikkojärjestelmistä sudokuun. Arkhimedes, 2006(2):18–21, 2006. In Finnish.
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84Armin Biere, Keijo Heljanko, Tommi Junttila, Timo Latvala, and Viktor Schuppan. Linear encodings of bounded LTL model checking. Logical Methods in Computer Science, 2(5:5), 2006. (doi: 10.2168/LMCS-2(5:5)2006).
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83Jussi Rintanen, Keijo Heljanko, and Ilkka Niemelä. Planning as satisfiability: parallel plans and algorithms for plan search. Artificial Intelligence, 170(12-13):1031–1080, 2006.
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82Harri Haanpää, Matti Järvisalo, Petteri Kaski, and Ilkka Niemelä. Hard satisfiable clause sets for benchmarking equivalence reasoning techniques. Journal on Satisfiability, Boolean Modeling and Computation, 2(1-4):27–46, 2006.
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81Tomi Janhunen, Ilkka Niemelä, Dietmar Seipel, Patrik Simons, and Jia-Huai You. Unfolding partiality and disjunctions in stable model semantics. ACM Transactions on Computational Logic, 7(1):1–37, January 2006.
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2005

80Patrik Floréen, Petteri Kaski, Jukka Kohonen, and Pekka Orponen. Exact and approximate balanced data gathering in energy-constrained sensor networks. Theoretical Computer Science, 344(1):30–46, November 2005.
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79Marco Bozzano, Roberto Bruttomesso, Alessandro Cimatti, Tommi Junttila, Peter van Rossum, Stephan Schulz, and Roberto Sebastiani. MathSAT: Tight integration of SAT and mathematical decision procedures. Journal of Automated Reasoning, 35(1–3):265–293, October 2005.
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78Harri Haanpää and Petteri Kaski. The near resolvable 2-(13, 4, 3) designs and thirteen-player whist tournaments. Designs, Codes and Cryptography, 35(3):271–285, June 2005.
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77Sakari Seitz, Mikko Alava, and Pekka Orponen. Focused local search for random 3-satisfiability. Journal of Statistical Mechanics: Theory and Experiment, P06006:1–27, June 2005.
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76Evan Griffiths and Pekka Orponen. Optimization, block designs and No Free Lunch theorems. Information Processing Letters, 94(2):55–61, April 2005.
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75Janne Lundberg, Catharina Candolin, and Hannu H. Kari. Multicast source authentication for limited devices. WSEAS Transactions on Computers, 4(4), 2005.
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74Janne Lundberg, Catharina Candolin, and Hannu H. Kari. Multicast source authentication for limited devices. WSEAS Transactions on Computers, 4(4), 2005.
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73Kimmo Varpaaniemi. On stubborn sets in the verification of linear time temporal properties. Formal Methods in System Design, 26(1):45–67, January 2005. © 2005 Springer Science + Business Media, Inc. (Norwell, MA, USA; Dordrecht, The Netherlands; Berlin, Germany).
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72Harri Haanpää. No 17-player triplewhist tournament has nontrivial automorphisms. Journal of Combinatorial Designs, 13:345–348, 2005.
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71Matti Järvisalo, Tommi Junttila, and Ilkka Niemelä. Unrestricted vs restricted cut in a tableau method for Boolean circuits. Annals of Mathematics and Artificial Intelligence, 44(4):373–399, 2005.
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70Patrik Floréen, Petteri Kaski, Jukka Kohonen, and Pekka Orponen. Lifetime maximization for multicasting in energy-constrained wireless networks. IEEE Journal on Selected Areas in Communications, 23(1):117–126, January 2005.
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69Petteri Kaski and Patric R. J. Östergård. One-factorizations of regular graphs of order 12. Electronic Journal of Combinatorics, 12:R2, 2005.
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68Petteri Kaski. Isomorph-free exhaustive generation of designs with prescribed groups of automorphisms. SIAM Journal on Discrete Mathematics, 19(3):664–690, 2005.
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67Petteri Kaski. Nonexistence of perfect Steiner triple systems of orders 19 and 21. Bayreuther Mathematische Schriften, 74:130–135, 2005. Proceedings of ALCOMA05, April 3–10, Thurnau, Germany.
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66Toni Jussila, Keijo Heljanko, and Ilkka Niemelä. BMC via on-the-fly determinization. International Journal on Software Tools for Technology Transfer, 7(2):89 – 101, 2005.
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2004

65Harri Haanpää. Minimum sum and difference covers of Abelian groups. Journal of Integer Sequences, 7(2):article 04.1.8, 2004.
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64Harri Haanpää, Antti Huima, and Patric R. J. Östergård. Sets in with distinct sums of pairs. Discrete Applied Mathematics, 138:99–106, 2004.
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63Gerhard Brewka, Ilkka Niemelä, and Tommi Syrjänen. Logic programs with ordered disjunction. Computational Intelligence, 20(2):333–357, 2004.
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62Matti Järvisalo. Lauselogiikan toteutuvuustarkastus: käytännönläheistä teoriaa. Tietojenkäsittelytiede, 22:47–63, 2004. In Finnish.
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61Petteri Kaski and Patric R. J. Östergård. Enumeration of balanced ternary designs. Discrete Applied Mathematics, 138(1–2):133–141, 2004.
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60Petteri Kaski and Patric R. J. Östergård. Miscellaneous classification results for 2-designs. Discrete Mathematics, 280(1–3):65–75, 2004.
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59Petteri Kaski. Packing Steiner trees with identical terminal sets. Information Processing Letters, 91(1):1–5, 2004.
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58Petteri Kaski and Patric R. J. Östergård. The Steiner triple systems of order 19. Mathematics of Computation, 73:2075–2092, 2004.
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57Petteri Kaski and Patric R. J. Östergård. There exist nonisomorphic STS(19) with equivalent point codes. Journal of Combinatorial Designs, 12(6):443–448, 2004.
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56Timo Latvala and Heikki Tauriainen. Improved on-the-fly verification with testers. Nordic Journal of Computing, 11(2):148–164, 2004.
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2003

55Jiří Šíma and Pekka Orponen. General purpose computation with neural networks: A survey of complexity theoretic results. Neural Computation, 15(12):2727–2778, December 2003.
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54Pekka Orponen. Tietotekniikkaa ennen tietokoneita — Alan Turing ja tietotekniikan kiehtovat alkuvaiheet. Tietoa, pages 4–6, November 2003.
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53Jiří Šíma and Pekka Orponen. Exponential transients in continuous-time Liapunov systems. Theoretical Computer Science, 306(1–3):353–372, September 2003.
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52Jiří Šíma and Pekka Orponen. Continuous-time symmetric Hopfield nets are computationally universal. Neural Computation, 15(3):693–733, March 2003.
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51Tomi Janhunen. Evaluating the effect of semi-normality on the expressiveness of defaults. Artificial Intelligence, 144(1–2):233–250, March 2003.
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50Kimmo Varpaaniemi. Towards ambitious approximation algorithms in stubborn set optimization. Fundamenta Informaticae (Annales Societatis Mathematicae Polonae, Series IV), 54(2–3):279–294, February 2003. IOS Press, Amsterdam, The Netherlands.
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49Evan Griffiths. Limit lemmas and jump inversion in the enumeration degrees. Archive for Mathematical Logic, 42(6), 2003.
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48Harri Haanpää and Patric R. J. Östergård. Classification of whist tournaments with up to 12 players. Discrete Applied Mathematics, 129:399–407, 2003.
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47Keijo Heljanko and Ilkka Niemelä. Bounded LTL model checking with stable models. Theory and Practice of Logic Programming, 3(4&5):519–550, 2003. Also available as (CoRR: arXiv:cs.LO/0305040).
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46Pekka Orponen. Mitä tietojenkäsittelyteoriaan kuuluu?. Tietojenkäsittelytiede, 19:15–28, 2003.
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45Petteri Kaski, Luis B. Morales, Patric R. J. Östergård, David A. Rosenblueth, and Carlos Velarde. Classification of resolvable 2-(14,7,12) and 3-(14,7,5) designs. Journal of Combinatorial Mathematics and Combinatorial Computing, 47:65–74, 2003.
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2002

44Kimmo Varpaaniemi. Minimizing the number of successor states in the stubborn set method. Fundamenta Informaticae (Annales Societatis Mathematicae Polonae, Series IV), 51(1–2):215–234, May 2002. IOS Press, Amsterdam, The Netherlands.
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43Pekka Nikander, Catharina Candolin, and Janne Lundberg. From address orientation to host orientation. Réseaux et systèmes répartis, calculateurs parallèles, ISSN 1260-3198, Special Issue on Mobility and Internet, 13, 2002.
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42Catharina Candolin. Ad hoc -johtamisverkot. Maanpuolustuksen aikakauslehti, 1(1), 2002.
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41Patrik Simons, Ilkka Niemelä, and Timo Soininen. Extending and implementing the stable model semantics. Artificial Intelligence, 138(1–2):181–234, 2002.
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40Patric R. J. Östergård and Petteri Kaski. Enumeration of 2-(9,3,lambda) designs and their resolutions. Designs, Codes and Cryptography, 27:131–137, 2002.
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2001

39Marko Mäkelä. Rinnakkaisuus hallintaan—formaalit menetelmät mutkikkaiden järjestelmien suunnittelun apuna. Prosessori, pages 68–71, November 2001. Erikoisnumero: elektroniikan suunnittelu (ES).
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38Stefan Brass, Jürgen Dix, Ilkka Niemelä, and T.C. Przymusinski. On the equivalence of the static and disjunctive well-founded semantics and its computation. Theoretical Computer Science, 258(1–2):523–553, May 2001.
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37Galina T. Bogdanova, Andries E. Brouwer, Stoian N. Kapralov, and Patric R.J. Östergård. Error-correcting codes over an alphabet of four elements. Designs, Codes and Cryptography, 23(3):333–342, 2001.
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36Galina T. Bogdanova and Patric R.J. Östergård. Bounds on codes over an alphabet of five elements. Discrete Mathematics, 240(1–3):13–19, 2001.
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35Alexander A. Davydov and Patric R.J. Östergård. Linear codes with covering radius and codimension . IEEE Transactions on Information Theory, 47(1):416–421, 2001.
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34Alexander A. Davydov and Patric R.J. Östergård. Recursive constructions of complete caps. Journal of Statistical Planning and Inference, 95(1–2):167–173, 2001.
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33T. Aaron Gulliver and Patric R.J. Östergård. Improved bounds for ternary linear codes of dimension 8 using tabu search. Journal of Heuristics, 7(1):37–46, 2001.
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32Patric R.J. Östergård. A new algorithm for the maximum-weight clique problem. Nordic Journal of Computing, 8(4):424–436, 2001.
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31Patric R.J. Östergård. There are 270,474,142 nonisomorphic 2-(9,4,6) designs. Journal of Combinatorial Mathematics and Combinatorial Computing, 37(1):173–176, 2001.
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30Patric R.J. Östergård and Uri Blass. On the size of optimal binary codes of length 9 and covering radius 1. IEEE Transactions on Information Theory, 47(6):2556–2557, 2001.
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29Patric R.J. Östergård and William D. Weakley. Values of domination numbers of the queen's graph. The Electronic Journal of Combinatorics, 8(1), 2001.
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28Petteri Kaski and Patric R. J. Östergård. There exists no (15,5,4) RBIBD. Journal of Combinatorial Designs, 9(5):357–362, 2001.
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27Leo Ojala, Nisse Husberg, and Teemu Tynjälä. Modelling and Analysing a Distributed Dynamic Channel Allocation Algorithm for Mobile Computing Using High-Level Net Methods. Software Tools for Technology Transfer, 3, 2001.
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26Tommi A. Junttila. Computational complexity of the Place/Transition-net symmetry reduction method. Journal of Universal Computer Science, 7(4):307–326, 2001.
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2000

25Kimmo Varpaaniemi. Stable models for stubborn sets. Fundamenta Informaticae (Annales Societatis Mathematicae Polonae, Series IV), 43(1–4):355–375, August 2000. IOS Press, Amsterdam, The Netherlands.
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24Tuomas Aura and Johan Lilius. A causal semantics for time petri nets. Theoretical Computer Science, 243(1–2):409–447, 2000.
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23Alexander Davydov and Patric R.J. Östergård. New quaternary linear codes with covering radius 2. Finite Fields and Their Applications, 6(2):164–174, 2000.
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22Alexander Davydov and Patric R.J. Östergård. On saturating sets in small projective geometries. European Journal of Combinatorics, 21(5):563–570, 2000.
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21T. Aaron Gulliver and Patric R.J. Östergård. New binary linear codes. Ars Combinatoria, 56(1):105–112, 2000.
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20Filip Karlemo and Patric R.J. Östergård. On sliding block puzzles. Journal of Combinatorial Mathematics and Combinatorial Computing, 34(1):97–107, 2000.
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19Kari J. Nurmela. Conjecturally optimal coverings of an equilateral triangle with up to 36 equal circles. Experimental Mathematics, 9(1):241–250, 2000.
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18Patric R.J. Östergård. Classification of binary/ternary one-error correcting codes. Discrete Mathematics, 223(1–3):253–262, 2000.
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17Patric R.J. Östergård. Enumeration of designs. The Australasian Journal of Combinatorics, 22(1):227–231, 2000.
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16Patric R.J. Östergård. Computer search for small complete caps. Journal of Geometry, 69(1–2):172–179, 2000.
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15Patric R.J. Östergård and William D. Weakley. Classification of binary covering codes. Journal of Combinatorial Designs, 8(6):391–401, 2000.
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14Harri Haanpää. A lower bound for a Ramsey number. Congressus Numerantium, 144:189–191, 2000.
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13Timo Latvala and Keijo Heljanko. Coping with strong fairness. Fundamenta Informaticae, 43(1–4):175–193, 2000.
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1999

12Tommi A. Junttila. Finding symmetries of algebraic system nets. Fundamenta Informaticae, 37(3):269–289, February 1999.
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11Ilkka Niemelä. Logic programming with stable model semantics as a constraint programming paradigm. Annals of Mathematics and Artificial Intelligence, 25(3,4):241–273, 1999.
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10Keijo Heljanko. Using logic programs with stable model semantics to solve deadlock and reachability problems for 1-safe Petri nets. Fundamenta Informaticae, 37(3):247–268, 1999.
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9Tomi Janhunen. On the intertranslatability of non-monotonic logics. Annals of Mathematics and Artificial Intelligence, 27(1-4):79–128, 1999. Special issue with the selected best papers from JELIA 1998.
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1998

8Gerd Brewka and Ilkka Niemelä. Report on the Seventh International Workshop on Nonmonotonic Reasoning. AI Magazine, 19(4):139, 1998.
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1997

7C. Aravindan, J. Dix, and Ilkka Niemelä. DisLoP: A research project on disjunctive logic programming. AI Communications, 10(3,4):151–165, 1997.
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6C. Aravindan, J. Dix, and Ilkka Niemelä. DisLoP: A research project on disjunctive logic programming. Computational Logic, 3(2), 1997.
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1996

5Kaisa Nyberg and Rainer A. Rueppel. Message recovery for signature schemes based on the discrete logarithm problem. Designs, Codes and Cryptography, 7(1–2):61–81, 1996.
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1995

4Ilkka Niemelä. A decision method for nonmonotonic reasoning based on autoepistemic reasoning. Journal of Automated Reasoning, 14:3–42, 1995.
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1994

3Ilkka Niemelä. Autoepisteeminen logiikka epämonotonisen päättelyn pohjana. Tietojenkäsittelytiede, 6:15–25, 1994.
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2Ilkka Niemelä and Jussi Rintanen. On the impact of stratification on the complexity of nonmonotonic reasoning. Journal of Applied Non-Classical Logics, 4(2):141–179, 1994.
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1992

1Ilkka Niemelä. On the decidability and complexity of autoepistemic reasoning. Fundamenta Informaticae, 17(1,2):117–155, 1992.
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Latest update: 19 January 2010.