--- _id: '5379' abstract: - lang: eng text: Computing the winning set for Büchi objectives in alternating games on graphs is a central problem in computer aided verification with a large number of applications. The long standing best known upper bound for solving the problem is ̃O(n·m), where n is the number of vertices and m is the number of edges in the graph. We are the first to break the ̃O(n·m) boundary by presenting a new technique that reduces the running time to O(n2). This bound also leads to O(n2) time algorithms for computing the set of almost-sure winning vertices for Büchi objectives (1) in alternating games with probabilistic transitions (improving an earlier bound of O(n·m)), (2) in concurrent graph games with constant actions (improving an earlier bound of O(n3)), and (3) in Markov decision processes (improving for m > n4/3 an earlier bound of O(min(m1.5, m·n2/3)). We also show that the same technique can be used to compute the maximal end-component decomposition of a graph in time O(n2), which is an improvement over earlier bounds for m > n4/3. Finally, we show how to maintain the winning set for Büchi objectives in alternating games under a sequence of edge insertions or a sequence of edge deletions in O(n) amortized time per operation. This is the first dynamic algorithm for this problem. alternative_title: - IST Austria Technical Report article_processing_charge: No author: - first_name: Krishnendu full_name: Chatterjee, Krishnendu id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87 last_name: Chatterjee orcid: 0000-0002-4561-241X - first_name: Monika H full_name: Henzinger, Monika H id: 540c9bbd-f2de-11ec-812d-d04a5be85630 last_name: Henzinger orcid: 0000-0002-5008-6530 citation: ama: Chatterjee K, Henzinger MH. An O(N2) Time Algorithm for Alternating Büchi Games. IST Austria; 2011. doi:10.15479/AT:IST-2011-0009 apa: Chatterjee, K., & Henzinger, M. H. (2011). An O(n2) time algorithm for alternating Büchi games. IST Austria. https://doi.org/10.15479/AT:IST-2011-0009 chicago: Chatterjee, Krishnendu, and Monika H Henzinger. An O(N2) Time Algorithm for Alternating Büchi Games. IST Austria, 2011. https://doi.org/10.15479/AT:IST-2011-0009. ieee: K. Chatterjee and M. H. Henzinger, An O(n2) time algorithm for alternating Büchi games. IST Austria, 2011. ista: Chatterjee K, Henzinger MH. 2011. An O(n2) time algorithm for alternating Büchi games, IST Austria, 20p. mla: Chatterjee, Krishnendu, and Monika H. Henzinger. An O(N2) Time Algorithm for Alternating Büchi Games. IST Austria, 2011, doi:10.15479/AT:IST-2011-0009. short: K. Chatterjee, M.H. Henzinger, An O(N2) Time Algorithm for Alternating Büchi Games, IST Austria, 2011. date_created: 2018-12-12T11:38:59Z date_published: 2011-07-11T00:00:00Z date_updated: 2023-02-23T11:15:12Z day: '11' ddc: - '000' - '004' department: - _id: KrCh doi: 10.15479/AT:IST-2011-0009 file: - access_level: open_access checksum: 0b354264229045d982332fd2cb5b9a26 content_type: application/pdf creator: system date_created: 2018-12-12T11:53:43Z date_updated: 2020-07-14T12:46:39Z file_id: '5504' file_name: IST-2011-0009_IST-2011-0009.pdf file_size: 388665 relation: main_file file_date_updated: 2020-07-14T12:46:39Z has_accepted_license: '1' language: - iso: eng month: '07' oa: 1 oa_version: Published Version page: '20' publication_identifier: issn: - 2664-1690 publication_status: published publisher: IST Austria pubrep_id: '15' related_material: record: - id: '3165' relation: later_version status: public status: public title: An O(n2) time algorithm for alternating Büchi games type: technical_report user_id: 6785fbc1-c503-11eb-8a32-93094b40e1cf year: '2011' ... --- _id: '5381' abstract: - lang: eng text: "In two-player finite-state stochastic games of partial obser- vation on graphs, in every state of the graph, the players simultaneously choose an action, and their joint actions determine a probability distri- bution over the successor states. The game is played for infinitely many rounds and thus the players construct an infinite path in the graph. We consider reachability objectives where the first player tries to ensure a target state to be visited almost-surely (i.e., with probability 1) or pos- itively (i.e., with positive probability), no matter the strategy of the second player.\r\n\r\nWe classify such games according to the information and to the power of randomization available to the players. On the basis of information, the game can be one-sided with either (a) player 1, or (b) player 2 having partial observation (and the other player has perfect observation), or two- sided with (c) both players having partial observation. On the basis of randomization, (a) the players may not be allowed to use randomization (pure strategies), or (b) they may choose a probability distribution over actions but the actual random choice is external and not visible to the player (actions invisible), or (c) they may use full randomization.\r\n\r\nOur main results for pure strategies are as follows: (1) For one-sided games with player 2 perfect observation we show that (in contrast to full randomized strategies) belief-based (subset-construction based) strate- gies are not sufficient, and present an exponential upper bound on mem- ory both for almost-sure and positive winning strategies; we show that the problem of deciding the existence of almost-sure and positive winning strategies for player 1 is EXPTIME-complete and present symbolic algo- rithms that avoid the explicit exponential construction. (2) For one-sided games with player 1 perfect observation we show that non-elementary memory is both necessary and sufficient for both almost-sure and posi- tive winning strategies. (3) We show that for the general (two-sided) case finite-memory strategies are sufficient for both positive and almost-sure winning, and at least non-elementary memory is required. We establish the equivalence of the almost-sure winning problems for pure strategies and for randomized strategies with actions invisible. Our equivalence re- sult exhibit serious flaws in previous results in the literature: we show a non-elementary memory lower bound for almost-sure winning whereas an exponential upper bound was previously claimed." alternative_title: - IST Austria Technical Report author: - first_name: Krishnendu full_name: Chatterjee, Krishnendu id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87 last_name: Chatterjee orcid: 0000-0002-4561-241X - first_name: Laurent full_name: Doyen, Laurent last_name: Doyen citation: ama: 'Chatterjee K, Doyen L. Partial-Observation Stochastic Games: How to Win When Belief Fails. IST Austria; 2011. doi:10.15479/AT:IST-2011-0007' apa: 'Chatterjee, K., & Doyen, L. (2011). Partial-observation stochastic games: How to win when belief fails. IST Austria. https://doi.org/10.15479/AT:IST-2011-0007' chicago: 'Chatterjee, Krishnendu, and Laurent Doyen. Partial-Observation Stochastic Games: How to Win When Belief Fails. IST Austria, 2011. https://doi.org/10.15479/AT:IST-2011-0007.' ieee: 'K. Chatterjee and L. Doyen, Partial-observation stochastic games: How to win when belief fails. IST Austria, 2011.' ista: 'Chatterjee K, Doyen L. 2011. Partial-observation stochastic games: How to win when belief fails, IST Austria, 43p.' mla: 'Chatterjee, Krishnendu, and Laurent Doyen. Partial-Observation Stochastic Games: How to Win When Belief Fails. IST Austria, 2011, doi:10.15479/AT:IST-2011-0007.' short: 'K. Chatterjee, L. Doyen, Partial-Observation Stochastic Games: How to Win When Belief Fails, IST Austria, 2011.' date_created: 2018-12-12T11:39:00Z date_published: 2011-07-05T00:00:00Z date_updated: 2023-02-23T11:05:48Z day: '05' ddc: - '000' - '005' department: - _id: KrCh doi: 10.15479/AT:IST-2011-0007 file: - access_level: open_access checksum: 06bf6dfc97f6006e3fd0e9a3f31bc961 content_type: application/pdf creator: system date_created: 2018-12-12T11:53:27Z date_updated: 2020-07-14T12:46:39Z file_id: '5488' file_name: IST-2011-0007_IST-2011-0007.pdf file_size: 574055 relation: main_file file_date_updated: 2020-07-14T12:46:39Z has_accepted_license: '1' language: - iso: eng month: '07' oa: 1 oa_version: Published Version page: '43' publication_identifier: issn: - 2664-1690 publication_status: published publisher: IST Austria pubrep_id: '17' related_material: record: - id: '1903' relation: later_version status: public - id: '2211' relation: later_version status: public - id: '2955' relation: later_version status: public status: public title: 'Partial-observation stochastic games: How to win when belief fails' type: technical_report user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2011' ... --- _id: '5380' abstract: - lang: eng text: 'We consider 2-player games played on a finite state space for an infinite number of rounds. The games are concurrent: in each round, the two players (player 1 and player 2) choose their moves independently and simultaneously; the current state and the two moves determine the successor state. We study concurrent games with ω-regular winning conditions specified as parity objectives. We consider the qualitative analysis problems: the computation of the almost-sure and limit-sure winning set of states, where player 1 can ensure to win with probability 1 and with probability arbitrarily close to 1, respectively. In general the almost-sure and limit-sure winning strategies require both infinite-memory as well as infinite-precision (to describe probabilities). We study the bounded-rationality problem for qualitative analysis of concurrent parity games, where the strategy set for player 1 is restricted to bounded-resource strategies. In terms of precision, strategies can be deterministic, uniform, finite-precision or infinite-precision; and in terms of memory, strategies can be memoryless, finite-memory or infinite-memory. We present a precise and complete characterization of the qualitative winning sets for all combinations of classes of strategies. In particular, we show that uniform memoryless strategies are as powerful as finite-precision infinite-memory strategies, and infinite-precision memoryless strategies are as powerful as infinite-precision finite-memory strategies. We show that the winning sets can be computed in O(n2d+3) time, where n is the size of the game structure and 2d is the number of priorities (or colors), and our algorithms are symbolic. The membership problem of whether a state belongs to a winning set can be decided in NP ∩ coNP. While this complexity is the same as for the simpler class of turn-based parity games, where in each state only one of the two players has a choice of moves, our algorithms,that are obtained by characterization of the winning sets as μ-calculus formulas, are considerably more involved than those for turn-based games.' alternative_title: - IST Austria Technical Report author: - first_name: Krishnendu full_name: Chatterjee, Krishnendu id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87 last_name: Chatterjee orcid: 0000-0002-4561-241X citation: ama: Chatterjee K. Bounded Rationality in Concurrent Parity Games. IST Austria; 2011. doi:10.15479/AT:IST-2011-0008 apa: Chatterjee, K. (2011). Bounded rationality in concurrent parity games. IST Austria. https://doi.org/10.15479/AT:IST-2011-0008 chicago: Chatterjee, Krishnendu. Bounded Rationality in Concurrent Parity Games. IST Austria, 2011. https://doi.org/10.15479/AT:IST-2011-0008. ieee: K. Chatterjee, Bounded rationality in concurrent parity games. IST Austria, 2011. ista: Chatterjee K. 2011. Bounded rationality in concurrent parity games, IST Austria, 53p. mla: Chatterjee, Krishnendu. Bounded Rationality in Concurrent Parity Games. IST Austria, 2011, doi:10.15479/AT:IST-2011-0008. short: K. Chatterjee, Bounded Rationality in Concurrent Parity Games, IST Austria, 2011. date_created: 2018-12-12T11:39:00Z date_published: 2011-07-11T00:00:00Z date_updated: 2023-02-23T11:22:53Z day: '11' ddc: - '000' department: - _id: KrCh doi: 10.15479/AT:IST-2011-0008 file: - access_level: open_access checksum: 0fd38186409be819a911c4990fa79d1f content_type: application/pdf creator: system date_created: 2018-12-12T11:54:22Z date_updated: 2020-07-14T12:46:39Z file_id: '5544' file_name: IST-2011-0008_IST-2011-0008.pdf file_size: 500399 relation: main_file file_date_updated: 2020-07-14T12:46:39Z has_accepted_license: '1' language: - iso: eng month: '07' oa: 1 oa_version: Published Version page: '53' publication_identifier: issn: - 2664-1690 publication_status: published publisher: IST Austria pubrep_id: '16' related_material: record: - id: '3338' relation: later_version status: public status: public title: Bounded rationality in concurrent parity games type: technical_report user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2011' ... --- _id: '5382' abstract: - lang: eng text: 'We consider two-player stochastic games played on a finite state space for an infinite num- ber of rounds. The games are concurrent: in each round, the two players (player 1 and player 2) choose their moves independently and simultaneously; the current state and the two moves determine a probability distribution over the successor states. We also consider the important special case of turn-based stochastic games where players make moves in turns, rather than concurrently. We study concurrent games with ω-regular winning conditions specified as parity objectives. The value for player 1 for a parity objective is the maximal probability with which the player can guarantee the satisfaction of the objective against all strategies of the opponent. We study the problem of continuity and robustness of the value function in concurrent and turn-based stochastic parity games with respect to imprecision in the transition probabilities. We present quantitative bounds on the difference of the value function (in terms of the imprecision of the transition probabilities) and show the value continuity for structurally equivalent concurrent games (two games are structurally equivalent if the support of the transition func- tion is same and the probabilities differ). We also show robustness of optimal strategies for structurally equivalent turn-based stochastic parity games. Finally we show that the value continuity property breaks without the structurally equivalent assumption (even for Markov chains) and show that our quantitative bound is asymptotically optimal. Hence our results are tight (the assumption is both necessary and sufficient) and optimal (our quantitative bound is asymptotically optimal).' alternative_title: - IST Austria Technical Report author: - first_name: Krishnendu full_name: Chatterjee, Krishnendu id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87 last_name: Chatterjee orcid: 0000-0002-4561-241X citation: ama: Chatterjee K. Robustness of Structurally Equivalent Concurrent Parity Games. IST Austria; 2011. doi:10.15479/AT:IST-2011-0006 apa: Chatterjee, K. (2011). Robustness of structurally equivalent concurrent parity games. IST Austria. https://doi.org/10.15479/AT:IST-2011-0006 chicago: Chatterjee, Krishnendu. Robustness of Structurally Equivalent Concurrent Parity Games. IST Austria, 2011. https://doi.org/10.15479/AT:IST-2011-0006. ieee: K. Chatterjee, Robustness of structurally equivalent concurrent parity games. IST Austria, 2011. ista: Chatterjee K. 2011. Robustness of structurally equivalent concurrent parity games, IST Austria, 18p. mla: Chatterjee, Krishnendu. Robustness of Structurally Equivalent Concurrent Parity Games. IST Austria, 2011, doi:10.15479/AT:IST-2011-0006. short: K. Chatterjee, Robustness of Structurally Equivalent Concurrent Parity Games, IST Austria, 2011. date_created: 2018-12-12T11:39:00Z date_published: 2011-06-27T00:00:00Z date_updated: 2023-02-23T11:23:01Z day: '27' ddc: - '000' - '005' department: - _id: KrCh doi: 10.15479/AT:IST-2011-0006 file: - access_level: open_access checksum: 1322b652d6ab07eb5248298a3f91c1cf content_type: application/pdf creator: system date_created: 2018-12-12T11:54:24Z date_updated: 2020-07-14T12:46:40Z file_id: '5546' file_name: IST-2011-0006_IST-2011-0006.pdf file_size: 335997 relation: main_file file_date_updated: 2020-07-14T12:46:40Z has_accepted_license: '1' language: - iso: eng month: '06' oa: 1 oa_version: Published Version page: '18' publication_identifier: issn: - 2664-1690 publication_status: published publisher: IST Austria pubrep_id: '18' related_material: record: - id: '3341' relation: later_version status: public status: public title: Robustness of structurally equivalent concurrent parity games type: technical_report user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2011' ... --- _id: '5385' abstract: - lang: eng text: There is recently a significant effort to add quantitative objectives to formal verification and synthesis. We introduce and investigate the extension of temporal logics with quantitative atomic assertions, aiming for a general and flexible framework for quantitative-oriented specifications. In the heart of quantitative objectives lies the accumulation of values along a computation. It is either the accumulated summation, as with the energy objectives, or the accumulated average, as with the mean-payoff objectives. We investigate the extension of temporal logics with the prefix-accumulation assertions Sum(v) ≥ c and Avg(v) ≥ c, where v is a numeric variable of the system, c is a constant rational number, and Sum(v) and Avg(v) denote the accumulated sum and average of the values of v from the beginning of the computation up to the current point of time. We also allow the path-accumulation assertions LimInfAvg(v) ≥ c and LimSupAvg(v) ≥ c, referring to the average value along an entire computation. We study the border of decidability for extensions of various temporal logics. In particular, we show that extending the fragment of CTL that has only the EX, EF, AX, and AG temporal modalities by prefix-accumulation assertions and extending LTL with path-accumulation assertions, result in temporal logics whose model-checking problem is decidable. The extended logics allow to significantly extend the currently known energy and mean-payoff objectives. Moreover, the prefix-accumulation assertions may be refined with “controlled-accumulation”, allowing, for example, to specify constraints on the average waiting time between a request and a grant. On the negative side, we show that the fragment we point to is, in a sense, the maximal logic whose extension with prefix-accumulation assertions permits a decidable model-checking procedure. Extending a temporal logic that has the EG or EU modalities, and in particular CTL and LTL, makes the problem undecidable. alternative_title: - IST Austria Technical Report author: - first_name: Udi full_name: Boker, Udi id: 31E297B6-F248-11E8-B48F-1D18A9856A87 last_name: Boker - first_name: Krishnendu full_name: Chatterjee, Krishnendu id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87 last_name: Chatterjee orcid: 0000-0002-4561-241X - first_name: Thomas A full_name: Henzinger, Thomas A id: 40876CD8-F248-11E8-B48F-1D18A9856A87 last_name: Henzinger orcid: 0000−0002−2985−7724 - first_name: Orna full_name: Kupferman, Orna last_name: Kupferman citation: ama: Boker U, Chatterjee K, Henzinger TA, Kupferman O. Temporal Specifications with Accumulative Values. IST Austria; 2011. doi:10.15479/AT:IST-2011-0003 apa: Boker, U., Chatterjee, K., Henzinger, T. A., & Kupferman, O. (2011). Temporal specifications with accumulative values. IST Austria. https://doi.org/10.15479/AT:IST-2011-0003 chicago: Boker, Udi, Krishnendu Chatterjee, Thomas A Henzinger, and Orna Kupferman. Temporal Specifications with Accumulative Values. IST Austria, 2011. https://doi.org/10.15479/AT:IST-2011-0003. ieee: U. Boker, K. Chatterjee, T. A. Henzinger, and O. Kupferman, Temporal specifications with accumulative values. IST Austria, 2011. ista: Boker U, Chatterjee K, Henzinger TA, Kupferman O. 2011. Temporal specifications with accumulative values, IST Austria, 14p. mla: Boker, Udi, et al. Temporal Specifications with Accumulative Values. IST Austria, 2011, doi:10.15479/AT:IST-2011-0003. short: U. Boker, K. Chatterjee, T.A. Henzinger, O. Kupferman, Temporal Specifications with Accumulative Values, IST Austria, 2011. date_created: 2018-12-12T11:39:02Z date_published: 2011-04-04T00:00:00Z date_updated: 2023-02-23T11:23:41Z day: '04' ddc: - '000' - '004' department: - _id: ToHe - _id: KrCh doi: 10.15479/AT:IST-2011-0003 ec_funded: 1 file: - access_level: open_access checksum: 8491d0d48c4911620ecd5350b413c11e content_type: application/pdf creator: system date_created: 2018-12-12T11:53:00Z date_updated: 2020-07-14T12:46:41Z file_id: '5461' file_name: IST-2011-0003_IST-2011-0003.pdf file_size: 366281 relation: main_file file_date_updated: 2020-07-14T12:46:41Z has_accepted_license: '1' language: - iso: eng month: '04' oa: 1 oa_version: Published Version page: '14' project: - _id: 25832EC2-B435-11E9-9278-68D0E5697425 call_identifier: FWF grant_number: S 11407_N23 name: Rigorous Systems Engineering - _id: 25EFB36C-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '215543' name: COMponent-Based Embedded Systems design Techniques - _id: 25EE3708-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '267989' name: Quantitative Reactive Modeling - _id: 25F1337C-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '214373' name: Design for Embedded Systems - _id: 2587B514-B435-11E9-9278-68D0E5697425 name: Microsoft Research Faculty Fellowship publication_identifier: issn: - 2664-1690 publication_status: published publisher: IST Austria pubrep_id: '21' related_material: record: - id: '2038' relation: later_version status: public - id: '3356' relation: later_version status: public status: public title: Temporal specifications with accumulative values type: technical_report user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2011' ... --- _id: '5386' abstract: - lang: eng text: 'We introduce TopoCut: a new way to integrate knowledge about topological properties (TPs) into random field image segmentation model. Instead of including TPs as additional constraints during minimization of the energy function, we devise an efficient algorithm for modifying the unary potentials such that the resulting segmentation is guaranteed with the desired properties. Our method is more flexible in the sense that it handles more topology constraints than previous methods, which were only able to enforce pairwise or global connectivity. In particular, our method is very fast, making it for the first time possible to enforce global topological properties in practical image segmentation tasks.' alternative_title: - IST Austria Technical Report author: - first_name: Chao full_name: Chen, Chao id: 3E92416E-F248-11E8-B48F-1D18A9856A87 last_name: Chen - first_name: Daniel full_name: Freedman, Daniel last_name: Freedman - first_name: Christoph full_name: Lampert, Christoph id: 40C20FD2-F248-11E8-B48F-1D18A9856A87 last_name: Lampert orcid: 0000-0001-8622-7887 citation: ama: Chen C, Freedman D, Lampert C. Enforcing Topological Constraints in Random Field Image Segmentation. IST Austria; 2011. doi:10.15479/AT:IST-2011-0002 apa: Chen, C., Freedman, D., & Lampert, C. (2011). Enforcing topological constraints in random field image segmentation. IST Austria. https://doi.org/10.15479/AT:IST-2011-0002 chicago: Chen, Chao, Daniel Freedman, and Christoph Lampert. Enforcing Topological Constraints in Random Field Image Segmentation. IST Austria, 2011. https://doi.org/10.15479/AT:IST-2011-0002. ieee: C. Chen, D. Freedman, and C. Lampert, Enforcing topological constraints in random field image segmentation. IST Austria, 2011. ista: Chen C, Freedman D, Lampert C. 2011. Enforcing topological constraints in random field image segmentation, IST Austria, 69p. mla: Chen, Chao, et al. Enforcing Topological Constraints in Random Field Image Segmentation. IST Austria, 2011, doi:10.15479/AT:IST-2011-0002. short: C. Chen, D. Freedman, C. Lampert, Enforcing Topological Constraints in Random Field Image Segmentation, IST Austria, 2011. date_created: 2018-12-12T11:39:02Z date_published: 2011-03-28T00:00:00Z date_updated: 2023-02-23T11:22:48Z day: '28' ddc: - '000' department: - _id: ChLa doi: 10.15479/AT:IST-2011-0002 file: - access_level: open_access checksum: ad64c2add5fe2ad10e9d5c669f3f9526 content_type: application/pdf creator: system date_created: 2018-12-12T11:53:34Z date_updated: 2020-07-14T12:46:41Z file_id: '5495' file_name: IST-2011-0002_IST-2011-0002.pdf file_size: 26390601 relation: main_file file_date_updated: 2020-07-14T12:46:41Z has_accepted_license: '1' language: - iso: eng month: '03' oa: 1 oa_version: Published Version page: '69' publication_identifier: issn: - 2664-1690 publication_status: published publisher: IST Austria pubrep_id: '22' related_material: record: - id: '3336' relation: later_version status: public status: public title: Enforcing topological constraints in random field image segmentation type: technical_report user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2011' ... --- _id: '5383' abstract: - lang: eng text: We present a new decidable logic called TREX for expressing constraints about imperative tree data structures. In particular, TREX supports a transitive closure operator that can express reachability constraints, which often appear in data structure invariants. We show that our logic is closed under weakest precondition computation, which enables its use for automated software verification. We further show that satisfiability of formulas in TREX is decidable in NP. The low complexity makes it an attractive alternative to more expensive logics such as monadic second-order logic (MSOL) over trees, which have been traditionally used for reasoning about tree data structures. alternative_title: - IST Austria Technical Report author: - first_name: Thomas full_name: Wies, Thomas id: 447BFB88-F248-11E8-B48F-1D18A9856A87 last_name: Wies - first_name: Marco full_name: Muñiz, Marco last_name: Muñiz - first_name: Viktor full_name: Kuncak, Viktor last_name: Kuncak citation: ama: Wies T, Muñiz M, Kuncak V. On an Efficient Decision Procedure for Imperative Tree Data Structures. IST Austria; 2011. doi:10.15479/AT:IST-2011-0005 apa: Wies, T., Muñiz, M., & Kuncak, V. (2011). On an efficient decision procedure for imperative tree data structures. IST Austria. https://doi.org/10.15479/AT:IST-2011-0005 chicago: Wies, Thomas, Marco Muñiz, and Viktor Kuncak. On an Efficient Decision Procedure for Imperative Tree Data Structures. IST Austria, 2011. https://doi.org/10.15479/AT:IST-2011-0005. ieee: T. Wies, M. Muñiz, and V. Kuncak, On an efficient decision procedure for imperative tree data structures. IST Austria, 2011. ista: Wies T, Muñiz M, Kuncak V. 2011. On an efficient decision procedure for imperative tree data structures, IST Austria, 25p. mla: Wies, Thomas, et al. On an Efficient Decision Procedure for Imperative Tree Data Structures. IST Austria, 2011, doi:10.15479/AT:IST-2011-0005. short: T. Wies, M. Muñiz, V. Kuncak, On an Efficient Decision Procedure for Imperative Tree Data Structures, IST Austria, 2011. date_created: 2018-12-12T11:39:01Z date_published: 2011-04-26T00:00:00Z date_updated: 2023-02-23T11:22:16Z day: '26' ddc: - '000' - '006' department: - _id: ToHe doi: 10.15479/AT:IST-2011-0005 file: - access_level: open_access checksum: b20029184c4a819c5f4466a4a3d238b5 content_type: application/pdf creator: system date_created: 2018-12-12T11:53:01Z date_updated: 2020-07-14T12:46:40Z file_id: '5462' file_name: IST-2011-0005_IST-2011-0005.pdf file_size: 619053 relation: main_file file_date_updated: 2020-07-14T12:46:40Z has_accepted_license: '1' language: - iso: eng month: '04' oa: 1 oa_version: Published Version page: '25' publication_identifier: issn: - 2664-1690 publication_status: published publisher: IST Austria pubrep_id: '19' related_material: record: - id: '3323' relation: later_version status: public status: public title: On an efficient decision procedure for imperative tree data structures type: technical_report user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2011' ... --- _id: '5384' abstract: - lang: eng text: 'We consider probabilistic automata on infinite words with acceptance defined by parity conditions. We consider three qualitative decision problems: (i) the positive decision problem asks whether there is a word that is accepted with positive probability; (ii) the almost decision problem asks whether there is a word that is accepted with probability 1; and (iii) the limit decision problem asks whether for every ε > 0 there is a word that is accepted with probability at least 1 − ε. We unify and generalize several decidability results for probabilistic automata over infinite words, and identify a robust (closed under union and intersection) subclass of probabilistic automata for which all the qualitative decision problems are decidable for parity conditions. We also show that if the input words are restricted to lasso shape words, then the positive and almost problems are decidable for all probabilistic automata with parity conditions.' alternative_title: - IST Austria Technical Report author: - first_name: Krishnendu full_name: Chatterjee, Krishnendu id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87 last_name: Chatterjee orcid: 0000-0002-4561-241X - first_name: Mathieu full_name: Tracol, Mathieu id: 3F54FA38-F248-11E8-B48F-1D18A9856A87 last_name: Tracol citation: ama: Chatterjee K, Tracol M. Decidable Problems for Probabilistic Automata on Infinite Words. IST Austria; 2011. doi:10.15479/AT:IST-2011-0004 apa: Chatterjee, K., & Tracol, M. (2011). Decidable problems for probabilistic automata on infinite words. IST Austria. https://doi.org/10.15479/AT:IST-2011-0004 chicago: Chatterjee, Krishnendu, and Mathieu Tracol. Decidable Problems for Probabilistic Automata on Infinite Words. IST Austria, 2011. https://doi.org/10.15479/AT:IST-2011-0004. ieee: K. Chatterjee and M. Tracol, Decidable problems for probabilistic automata on infinite words. IST Austria, 2011. ista: Chatterjee K, Tracol M. 2011. Decidable problems for probabilistic automata on infinite words, IST Austria, 30p. mla: Chatterjee, Krishnendu, and Mathieu Tracol. Decidable Problems for Probabilistic Automata on Infinite Words. IST Austria, 2011, doi:10.15479/AT:IST-2011-0004. short: K. Chatterjee, M. Tracol, Decidable Problems for Probabilistic Automata on Infinite Words, IST Austria, 2011. date_created: 2018-12-12T11:39:01Z date_published: 2011-04-11T00:00:00Z date_updated: 2023-02-23T11:05:53Z day: '11' ddc: - '000' - '005' department: - _id: KrCh doi: 10.15479/AT:IST-2011-0004 file: - access_level: open_access checksum: f5a0f664fadc335990f5fcf138df19f1 content_type: application/pdf creator: system date_created: 2018-12-12T11:54:23Z date_updated: 2020-07-14T12:46:40Z file_id: '5545' file_name: IST-2011-004_IST-2011-0004.pdf file_size: 570827 relation: main_file file_date_updated: 2020-07-14T12:46:40Z has_accepted_license: '1' language: - iso: eng month: '04' oa: 1 oa_version: Published Version page: '30' publication_identifier: issn: - 2664-1690 publication_status: published publisher: IST Austria pubrep_id: '20' related_material: record: - id: '2957' relation: later_version status: public status: public title: Decidable problems for probabilistic automata on infinite words type: technical_report user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2011' ... --- _id: '5387' abstract: - lang: eng text: We consider Markov Decision Processes (MDPs) with mean-payoff parity and energy parity objectives. In system design, the parity objective is used to encode ω-regular specifications, and the mean-payoff and energy objectives can be used to model quantitative resource constraints. The energy condition re- quires that the resource level never drops below 0, and the mean-payoff condi- tion requires that the limit-average value of the resource consumption is within a threshold. While these two (energy and mean-payoff) classical conditions are equivalent for two-player games, we show that they differ for MDPs. We show that the problem of deciding whether a state is almost-sure winning (i.e., winning with probability 1) in energy parity MDPs is in NP ∩ coNP, while for mean- payoff parity MDPs, the problem is solvable in polynomial time, improving a recent PSPACE bound. alternative_title: - IST Austria Technical Report author: - first_name: Krishnendu full_name: Chatterjee, Krishnendu id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87 last_name: Chatterjee orcid: 0000-0002-4561-241X - first_name: Laurent full_name: Doyen, Laurent last_name: Doyen citation: ama: Chatterjee K, Doyen L. Energy and Mean-Payoff Parity Markov Decision Processes. IST Austria; 2011. doi:10.15479/AT:IST-2011-0001 apa: Chatterjee, K., & Doyen, L. (2011). Energy and mean-payoff parity Markov decision processes. IST Austria. https://doi.org/10.15479/AT:IST-2011-0001 chicago: Chatterjee, Krishnendu, and Laurent Doyen. Energy and Mean-Payoff Parity Markov Decision Processes. IST Austria, 2011. https://doi.org/10.15479/AT:IST-2011-0001. ieee: K. Chatterjee and L. Doyen, Energy and mean-payoff parity Markov decision processes. IST Austria, 2011. ista: Chatterjee K, Doyen L. 2011. Energy and mean-payoff parity Markov decision processes, IST Austria, 20p. mla: Chatterjee, Krishnendu, and Laurent Doyen. Energy and Mean-Payoff Parity Markov Decision Processes. IST Austria, 2011, doi:10.15479/AT:IST-2011-0001. short: K. Chatterjee, L. Doyen, Energy and Mean-Payoff Parity Markov Decision Processes, IST Austria, 2011. date_created: 2018-12-12T11:39:02Z date_published: 2011-02-16T00:00:00Z date_updated: 2023-02-23T11:23:11Z day: '16' ddc: - '000' - '005' department: - _id: KrCh doi: 10.15479/AT:IST-2011-0001 file: - access_level: open_access checksum: 824d6c70e6d3feb3e836b009e0b3cf73 content_type: application/pdf creator: system date_created: 2018-12-12T11:52:57Z date_updated: 2020-07-14T12:46:41Z file_id: '5458' file_name: IST-2011-0001_IST-2011-0001.pdf file_size: 329976 relation: main_file file_date_updated: 2020-07-14T12:46:41Z has_accepted_license: '1' language: - iso: eng month: '02' oa: 1 oa_version: Published Version page: '20' publication_identifier: issn: - 2664-1690 publication_status: published publisher: IST Austria pubrep_id: '23' related_material: record: - id: '3345' relation: later_version status: public status: public title: Energy and mean-payoff parity Markov decision processes type: technical_report user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2011' ... --- _id: '5388' abstract: - lang: eng text: "We present an algorithmic method for the synthesis of concurrent programs that are optimal with respect to quantitative performance measures. The input consists of a sequential sketch, that is, a program that does not contain synchronization constructs, and of a parametric performance model that assigns costs to actions such as locking, context switching, and idling. The quantitative synthesis problem is to automatically introduce synchronization constructs into the sequential sketch so that both correctness is guaranteed and worst-case (or average-case) performance is optimized. Correctness is formalized as race freedom or linearizability.\r\n\r\nWe show that for worst-case performance, the problem can be modeled\r\nas a 2-player graph game with quantitative (limit-average) objectives, and\r\nfor average-case performance, as a 2 1/2 -player graph game (with probabilistic transitions). In both cases, the optimal correct program is derived from an optimal strategy in the corresponding quantitative game. We prove that the respective game problems are computationally expensive (NP-complete), and present several techniques that overcome the theoretical difficulty in cases of concurrent programs of practical interest.\r\n\r\nWe have implemented a prototype tool and used it for the automatic syn- thesis of programs that access a concurrent list. For certain parameter val- ues, our method automatically synthesizes various classical synchronization schemes for implementing a concurrent list, such as fine-grained locking or a lazy algorithm. For other parameter values, a new, hybrid synchronization style is synthesized, which uses both the lazy approach and coarse-grained locks (instead of standard fine-grained locks). The trade-off occurs because while fine-grained locking tends to decrease the cost that is due to waiting for locks, it increases cache size requirements." alternative_title: - IST Austria Technical Report author: - first_name: Krishnendu full_name: Chatterjee, Krishnendu id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87 last_name: Chatterjee orcid: 0000-0002-4561-241X - first_name: Pavol full_name: Cerny, Pavol id: 4DCBEFFE-F248-11E8-B48F-1D18A9856A87 last_name: Cerny - first_name: Thomas A full_name: Henzinger, Thomas A id: 40876CD8-F248-11E8-B48F-1D18A9856A87 last_name: Henzinger orcid: 0000−0002−2985−7724 - first_name: Arjun full_name: Radhakrishna, Arjun id: 3B51CAC4-F248-11E8-B48F-1D18A9856A87 last_name: Radhakrishna - first_name: Rohit full_name: Singh, Rohit last_name: Singh citation: ama: Chatterjee K, Cerny P, Henzinger TA, Radhakrishna A, Singh R. Quantitative Synthesis for Concurrent Programs. IST Austria; 2010. doi:10.15479/AT:IST-2010-0004 apa: Chatterjee, K., Cerny, P., Henzinger, T. A., Radhakrishna, A., & Singh, R. (2010). Quantitative synthesis for concurrent programs. IST Austria. https://doi.org/10.15479/AT:IST-2010-0004 chicago: Chatterjee, Krishnendu, Pavol Cerny, Thomas A Henzinger, Arjun Radhakrishna, and Rohit Singh. Quantitative Synthesis for Concurrent Programs. IST Austria, 2010. https://doi.org/10.15479/AT:IST-2010-0004. ieee: K. Chatterjee, P. Cerny, T. A. Henzinger, A. Radhakrishna, and R. Singh, Quantitative synthesis for concurrent programs. IST Austria, 2010. ista: Chatterjee K, Cerny P, Henzinger TA, Radhakrishna A, Singh R. 2010. Quantitative synthesis for concurrent programs, IST Austria, 17p. mla: Chatterjee, Krishnendu, et al. Quantitative Synthesis for Concurrent Programs. IST Austria, 2010, doi:10.15479/AT:IST-2010-0004. short: K. Chatterjee, P. Cerny, T.A. Henzinger, A. Radhakrishna, R. Singh, Quantitative Synthesis for Concurrent Programs, IST Austria, 2010. date_created: 2018-12-12T11:39:03Z date_published: 2010-10-07T00:00:00Z date_updated: 2023-02-23T11:24:08Z day: '07' ddc: - '000' - '005' department: - _id: KrCh - _id: ToHe doi: 10.15479/AT:IST-2010-0004 file: - access_level: open_access checksum: da38782d2388a6fa32109d10bb9bad67 content_type: application/pdf creator: system date_created: 2018-12-12T11:53:53Z date_updated: 2020-07-14T12:46:42Z file_id: '5515' file_name: IST-2010-0004_IST-2010-0004.pdf file_size: 429101 relation: main_file file_date_updated: 2020-07-14T12:46:42Z has_accepted_license: '1' language: - iso: eng month: '10' oa: 1 oa_version: Published Version page: '17' publication_identifier: issn: - 2664-1690 publication_status: published publisher: IST Austria pubrep_id: '24' related_material: record: - id: '3366' relation: later_version status: public status: public title: Quantitative synthesis for concurrent programs type: technical_report user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2010' ... --- _id: '5389' abstract: - lang: eng text: Boolean notions of correctness are formalized by preorders on systems. Quantitative measures of correctness can be formalized by real-valued distance functions between systems, where the distance between implementation and specification provides a measure of “fit” or “desirability.” We extend the simulation preorder to the quantitative setting, by making each player of a simulation game pay a certain price for her choices. We use the resulting games with quantitative objectives to define three different simulation distances. The correctness distance measures how much the specification must be changed in order to be satisfied by the implementation. The coverage distance measures how much the im- plementation restricts the degrees of freedom offered by the specification. The robustness distance measures how much a system can deviate from the implementation description without violating the specification. We consider these distances for safety as well as liveness specifications. The distances can be computed in polynomial time for safety specifications, and for liveness specifications given by weak fairness constraints. We show that the distance functions satisfy the triangle inequality, that the distance between two systems does not increase under parallel composition with a third system, and that the distance between two systems can be bounded from above and below by distances between abstractions of the two systems. These properties suggest that our simulation distances provide an appropriate basis for a quantitative theory of discrete systems. We also demonstrate how the robustness distance can be used to measure how many transmission errors are tolerated by error correcting codes. alternative_title: - IST Austria Technical Report author: - first_name: Pavol full_name: Cerny, Pavol id: 4DCBEFFE-F248-11E8-B48F-1D18A9856A87 last_name: Cerny - first_name: Thomas A full_name: Henzinger, Thomas A id: 40876CD8-F248-11E8-B48F-1D18A9856A87 last_name: Henzinger orcid: 0000−0002−2985−7724 - first_name: Arjun full_name: Radhakrishna, Arjun id: 3B51CAC4-F248-11E8-B48F-1D18A9856A87 last_name: Radhakrishna citation: ama: Cerny P, Henzinger TA, Radhakrishna A. Simulation Distances. IST Austria; 2010. doi:10.15479/AT:IST-2010-0003 apa: Cerny, P., Henzinger, T. A., & Radhakrishna, A. (2010). Simulation distances. IST Austria. https://doi.org/10.15479/AT:IST-2010-0003 chicago: Cerny, Pavol, Thomas A Henzinger, and Arjun Radhakrishna. Simulation Distances. IST Austria, 2010. https://doi.org/10.15479/AT:IST-2010-0003. ieee: P. Cerny, T. A. Henzinger, and A. Radhakrishna, Simulation distances. IST Austria, 2010. ista: Cerny P, Henzinger TA, Radhakrishna A. 2010. Simulation distances, IST Austria, 24p. mla: Cerny, Pavol, et al. Simulation Distances. IST Austria, 2010, doi:10.15479/AT:IST-2010-0003. short: P. Cerny, T.A. Henzinger, A. Radhakrishna, Simulation Distances, IST Austria, 2010. date_created: 2018-12-12T11:39:03Z date_published: 2010-06-04T00:00:00Z date_updated: 2023-02-23T12:09:16Z day: '04' ddc: - '005' department: - _id: ToHe doi: 10.15479/AT:IST-2010-0003 file: - access_level: open_access checksum: 284ded99764e32a583a8ea83fcea254b content_type: application/pdf creator: system date_created: 2018-12-12T11:54:25Z date_updated: 2020-07-14T12:46:42Z file_id: '5547' file_name: IST-2010-0003_IST-2010-0003.pdf file_size: 367246 relation: main_file file_date_updated: 2020-07-14T12:46:42Z has_accepted_license: '1' language: - iso: eng month: '06' oa: 1 oa_version: Published Version page: '24' publication_identifier: issn: - 2664-1690 publication_status: published publisher: IST Austria pubrep_id: '25' related_material: record: - id: '3249' relation: later_version status: public - id: '4393' relation: later_version status: public status: public title: Simulation distances type: technical_report user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2010' ... --- _id: '5391' abstract: - lang: eng text: Concurrent data structures with fine-grained synchronization are notoriously difficult to implement correctly. The difficulty of reasoning about these implementations does not stem from the number of variables or the program size, but rather from the large number of possible interleavings. These implementations are therefore prime candidates for model checking. We introduce an algorithm for verifying linearizability of singly-linked heap-based concurrent data structures. We consider a model consisting of an unbounded heap where each node consists an element from an unbounded data domain, with a restricted set of operations for testing and updating pointers and data elements. Our main result is that linearizability is decidable for programs that invoke a fixed number of methods, possibly in parallel. This decidable fragment covers many of the common implementation techniques — fine-grained locking, lazy synchronization, and lock-free synchronization. We also show how the technique can be used to verify optimistic implementations with the help of programmer annotations. We developed a verification tool CoLT and evaluated it on a representative sample of Java implementations of the concurrent set data structure. The tool verified linearizability of a number of implementations, found a known error in a lock-free imple- mentation and proved that the corrected version is linearizable. alternative_title: - IST Austria Technical Report author: - first_name: Pavol full_name: Cerny, Pavol id: 4DCBEFFE-F248-11E8-B48F-1D18A9856A87 last_name: Cerny - first_name: Arjun full_name: Radhakrishna, Arjun id: 3B51CAC4-F248-11E8-B48F-1D18A9856A87 last_name: Radhakrishna - first_name: Damien full_name: Zufferey, Damien id: 4397AC76-F248-11E8-B48F-1D18A9856A87 last_name: Zufferey orcid: 0000-0002-3197-8736 - first_name: Swarat full_name: Chaudhuri, Swarat last_name: Chaudhuri - first_name: Rajeev full_name: Alur, Rajeev last_name: Alur citation: ama: Cerny P, Radhakrishna A, Zufferey D, Chaudhuri S, Alur R. Model Checking of Linearizability of Concurrent List Implementations. IST Austria; 2010. doi:10.15479/AT:IST-2010-0001 apa: Cerny, P., Radhakrishna, A., Zufferey, D., Chaudhuri, S., & Alur, R. (2010). Model checking of linearizability of concurrent list implementations. IST Austria. https://doi.org/10.15479/AT:IST-2010-0001 chicago: Cerny, Pavol, Arjun Radhakrishna, Damien Zufferey, Swarat Chaudhuri, and Rajeev Alur. Model Checking of Linearizability of Concurrent List Implementations. IST Austria, 2010. https://doi.org/10.15479/AT:IST-2010-0001. ieee: P. Cerny, A. Radhakrishna, D. Zufferey, S. Chaudhuri, and R. Alur, Model checking of linearizability of concurrent list implementations. IST Austria, 2010. ista: Cerny P, Radhakrishna A, Zufferey D, Chaudhuri S, Alur R. 2010. Model checking of linearizability of concurrent list implementations, IST Austria, 27p. mla: Cerny, Pavol, et al. Model Checking of Linearizability of Concurrent List Implementations. IST Austria, 2010, doi:10.15479/AT:IST-2010-0001. short: P. Cerny, A. Radhakrishna, D. Zufferey, S. Chaudhuri, R. Alur, Model Checking of Linearizability of Concurrent List Implementations, IST Austria, 2010. date_created: 2018-12-12T11:39:04Z date_published: 2010-04-19T00:00:00Z date_updated: 2023-02-23T12:09:09Z day: '19' ddc: - '004' department: - _id: ToHe doi: 10.15479/AT:IST-2010-0001 file: - access_level: open_access checksum: 986645caad7dd85a6a091488f6c646dc content_type: application/pdf creator: system date_created: 2018-12-12T11:53:44Z date_updated: 2020-07-14T12:46:43Z file_id: '5505' file_name: IST-2010-0001_IST-2010-0001.pdf file_size: 372286 relation: main_file file_date_updated: 2020-07-14T12:46:43Z has_accepted_license: '1' language: - iso: eng month: '04' oa: 1 oa_version: Published Version page: '27' publication_identifier: issn: - 2664-1690 publication_status: published publisher: IST Austria pubrep_id: '27' related_material: record: - id: '4390' relation: later_version status: public status: public title: Model checking of linearizability of concurrent list implementations type: technical_report user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2010' ... --- _id: '5390' abstract: - lang: eng text: The class of ω regular languages provide a robust specification language in verification. Every ω-regular condition can be decomposed into a safety part and a liveness part. The liveness part ensures that something good happens “eventually.” Two main strengths of the classical, infinite-limit formulation of liveness are robustness (independence from the granularity of transitions) and simplicity (abstraction of complicated time bounds). However, the classical liveness formulation suffers from the drawback that the time until something good happens may be unbounded. A stronger formulation of liveness, so-called finitary liveness, overcomes this drawback, while still retaining robustness and simplicity. Finitary liveness requires that there exists an unknown, fixed bound b such that something good happens within b transitions. In this work we consider the finitary parity and Streett (fairness) conditions. We present the topological, automata-theoretic and logical characterization of finitary languages defined by finitary parity and Streett conditions. We (a) show that the finitary parity and Streett languages are Σ2-complete; (b) present a complete characterization of the expressive power of various classes of automata with finitary and infinitary conditions (in particular we show that non-deterministic finitary parity and Streett automata cannot be determinized to deterministic finitary parity or Streett automata); and (c) show that the languages defined by non-deterministic finitary parity automata exactly characterize the star-free fragment of ωB-regular languages. alternative_title: - IST Austria Technical Report author: - first_name: Krishnendu full_name: Chatterjee, Krishnendu id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87 last_name: Chatterjee orcid: 0000-0002-4561-241X - first_name: Nathanaël full_name: Fijalkow, Nathanaël last_name: Fijalkow citation: ama: Chatterjee K, Fijalkow N. Topological, Automata-Theoretic and Logical Characterization of Finitary Languages. IST Austria; 2010. doi:10.15479/AT:IST-2010-0002 apa: Chatterjee, K., & Fijalkow, N. (2010). Topological, automata-theoretic and logical characterization of finitary languages. IST Austria. https://doi.org/10.15479/AT:IST-2010-0002 chicago: Chatterjee, Krishnendu, and Nathanaël Fijalkow. Topological, Automata-Theoretic and Logical Characterization of Finitary Languages. IST Austria, 2010. https://doi.org/10.15479/AT:IST-2010-0002. ieee: K. Chatterjee and N. Fijalkow, Topological, automata-theoretic and logical characterization of finitary languages. IST Austria, 2010. ista: Chatterjee K, Fijalkow N. 2010. Topological, automata-theoretic and logical characterization of finitary languages, IST Austria, 21p. mla: Chatterjee, Krishnendu, and Nathanaël Fijalkow. Topological, Automata-Theoretic and Logical Characterization of Finitary Languages. IST Austria, 2010, doi:10.15479/AT:IST-2010-0002. short: K. Chatterjee, N. Fijalkow, Topological, Automata-Theoretic and Logical Characterization of Finitary Languages, IST Austria, 2010. date_created: 2018-12-12T11:39:03Z date_published: 2010-06-04T00:00:00Z date_updated: 2020-07-14T23:04:41Z day: '04' ddc: - '000' department: - _id: KrCh doi: 10.15479/AT:IST-2010-0002 file: - access_level: open_access checksum: 283d3604d76dd4d5161585d4c8625fbe content_type: application/pdf creator: system date_created: 2018-12-12T11:54:10Z date_updated: 2020-07-14T12:46:43Z file_id: '5532' file_name: IST-2010-0002_IST-2010-0002.pdf file_size: 395662 relation: main_file file_date_updated: 2020-07-14T12:46:43Z has_accepted_license: '1' language: - iso: eng month: '06' oa: 1 oa_version: Published Version page: '21' publication_identifier: issn: - 2664-1690 publication_status: published publisher: IST Austria pubrep_id: '26' status: public title: Topological, automata-theoretic and logical characterization of finitary languages type: technical_report user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2010' ... --- _id: '5393' abstract: - lang: eng text: Gist is a tool that (a) solves the qualitative analysis problem of turn-based probabilistic games with ω-regular objectives; and (b) synthesizes reasonable environment assumptions for synthesis of unrealizable specifications. Our tool provides efficient implementations of several reduction based techniques to solve turn-based probabilistic games, and uses the analysis of turn-based probabilistic games for synthesizing environment assumptions for unrealizable specifications. alternative_title: - IST Austria Technical Report author: - first_name: Krishnendu full_name: Chatterjee, Krishnendu id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87 last_name: Chatterjee orcid: 0000-0002-4561-241X - first_name: Thomas A full_name: Henzinger, Thomas A id: 40876CD8-F248-11E8-B48F-1D18A9856A87 last_name: Henzinger orcid: 0000−0002−2985−7724 - first_name: Barbara full_name: Jobstmann, Barbara last_name: Jobstmann - first_name: Arjun full_name: Radhakrishna, Arjun id: 3B51CAC4-F248-11E8-B48F-1D18A9856A87 last_name: Radhakrishna citation: ama: 'Chatterjee K, Henzinger TA, Jobstmann B, Radhakrishna A. Gist: A Solver for Probabilistic Games. IST Austria; 2009. doi:10.15479/AT:IST-2009-0003' apa: 'Chatterjee, K., Henzinger, T. A., Jobstmann, B., & Radhakrishna, A. (2009). Gist: A solver for probabilistic games. IST Austria. https://doi.org/10.15479/AT:IST-2009-0003' chicago: 'Chatterjee, Krishnendu, Thomas A Henzinger, Barbara Jobstmann, and Arjun Radhakrishna. Gist: A Solver for Probabilistic Games. IST Austria, 2009. https://doi.org/10.15479/AT:IST-2009-0003.' ieee: 'K. Chatterjee, T. A. Henzinger, B. Jobstmann, and A. Radhakrishna, Gist: A solver for probabilistic games. IST Austria, 2009.' ista: 'Chatterjee K, Henzinger TA, Jobstmann B, Radhakrishna A. 2009. Gist: A solver for probabilistic games, IST Austria, 12p.' mla: 'Chatterjee, Krishnendu, et al. Gist: A Solver for Probabilistic Games. IST Austria, 2009, doi:10.15479/AT:IST-2009-0003.' short: 'K. Chatterjee, T.A. Henzinger, B. Jobstmann, A. Radhakrishna, Gist: A Solver for Probabilistic Games, IST Austria, 2009.' date_created: 2018-12-12T11:39:05Z date_published: 2009-10-09T00:00:00Z date_updated: 2023-02-23T12:09:01Z day: '09' ddc: - '000' - '005' department: - _id: KrCh - _id: ToHe doi: 10.15479/AT:IST-2009-0003 file: - access_level: open_access checksum: 49551ac552915b17593a14c993845274 content_type: application/pdf creator: system date_created: 2018-12-12T11:52:58Z date_updated: 2020-07-14T12:46:43Z file_id: '5459' file_name: IST-2009-0003_IST-2009-0003.pdf file_size: 386866 relation: main_file file_date_updated: 2020-07-14T12:46:43Z has_accepted_license: '1' language: - iso: eng month: '10' oa: 1 oa_version: Published Version page: '12' publication_identifier: issn: - 2664-1690 publication_status: published publisher: IST Austria pubrep_id: '29' related_material: record: - id: '4388' relation: later_version status: public status: public title: 'Gist: A solver for probabilistic games' type: technical_report user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2009' ... --- _id: '5394' abstract: - lang: eng text: We consider two-player games played on graphs with request-response and finitary Streett objectives. We show these games are PSPACE-hard, improving the previous known NP-hardness. We also improve the lower bounds on memory required by the winning strategies for the players. alternative_title: - IST Austria Technical Report author: - first_name: Krishnendu full_name: Chatterjee, Krishnendu id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87 last_name: Chatterjee orcid: 0000-0002-4561-241X - first_name: Thomas A full_name: Henzinger, Thomas A id: 40876CD8-F248-11E8-B48F-1D18A9856A87 last_name: Henzinger orcid: 0000−0002−2985−7724 - first_name: Florian full_name: Horn, Florian id: 37327ACE-F248-11E8-B48F-1D18A9856A87 last_name: Horn citation: ama: Chatterjee K, Henzinger TA, Horn F. Improved Lower Bounds for Request-Response and Finitary Streett Games. IST Austria; 2009. doi:10.15479/AT:IST-2009-0002 apa: Chatterjee, K., Henzinger, T. A., & Horn, F. (2009). Improved lower bounds for request-response and finitary Streett games. IST Austria. https://doi.org/10.15479/AT:IST-2009-0002 chicago: Chatterjee, Krishnendu, Thomas A Henzinger, and Florian Horn. Improved Lower Bounds for Request-Response and Finitary Streett Games. IST Austria, 2009. https://doi.org/10.15479/AT:IST-2009-0002. ieee: K. Chatterjee, T. A. Henzinger, and F. Horn, Improved lower bounds for request-response and finitary Streett games. IST Austria, 2009. ista: Chatterjee K, Henzinger TA, Horn F. 2009. Improved lower bounds for request-response and finitary Streett games, IST Austria, 11p. mla: Chatterjee, Krishnendu, et al. Improved Lower Bounds for Request-Response and Finitary Streett Games. IST Austria, 2009, doi:10.15479/AT:IST-2009-0002. short: K. Chatterjee, T.A. Henzinger, F. Horn, Improved Lower Bounds for Request-Response and Finitary Streett Games, IST Austria, 2009. date_created: 2018-12-12T11:39:05Z date_published: 2009-09-09T00:00:00Z date_updated: 2020-07-14T23:07:47Z day: '09' ddc: - '004' department: - _id: KrCh - _id: ToHe doi: 10.15479/AT:IST-2009-0002 file: - access_level: open_access checksum: 1c50a9723fbae1b2c46d18138968efb3 content_type: application/pdf creator: system date_created: 2018-12-12T11:53:50Z date_updated: 2020-07-14T12:46:43Z file_id: '5511' file_name: IST-2009-0002_IST-2009-0002.pdf file_size: 238091 relation: main_file file_date_updated: 2020-07-14T12:46:43Z has_accepted_license: '1' language: - iso: eng month: '09' oa: 1 oa_version: Published Version page: '11' publication_identifier: issn: - 2664-1690 publication_status: published publisher: IST Austria pubrep_id: '30' status: public title: Improved lower bounds for request-response and finitary Streett games type: technical_report user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2009' ... --- _id: '5392' abstract: - lang: eng text: We consider probabilistic automata on infinite words with acceptance defined by safety, reachability, Büchi, coBüchi and limit-average conditions. We consider quantitative and qualitative decision problems. We present extensions and adaptations of proofs of [GO09] and present a precise characterization of the decidability and undecidability frontier of the quantitative and qualitative decision problems. alternative_title: - IST Austria Technical Report author: - first_name: Krishnendu full_name: Chatterjee, Krishnendu id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87 last_name: Chatterjee orcid: 0000-0002-4561-241X citation: ama: 'Chatterjee K. Probabilistic Automata on Infinite Words: Decidability and Undecidability Results. IST Austria; 2009. doi:10.15479/AT:IST-2009-0004' apa: 'Chatterjee, K. (2009). Probabilistic automata on infinite words: Decidability and undecidability results. IST Austria. https://doi.org/10.15479/AT:IST-2009-0004' chicago: 'Chatterjee, Krishnendu. Probabilistic Automata on Infinite Words: Decidability and Undecidability Results. IST Austria, 2009. https://doi.org/10.15479/AT:IST-2009-0004.' ieee: 'K. Chatterjee, Probabilistic automata on infinite words: Decidability and undecidability results. IST Austria, 2009.' ista: 'Chatterjee K. 2009. Probabilistic automata on infinite words: Decidability and undecidability results, IST Austria, 17p.' mla: 'Chatterjee, Krishnendu. Probabilistic Automata on Infinite Words: Decidability and Undecidability Results. IST Austria, 2009, doi:10.15479/AT:IST-2009-0004.' short: 'K. Chatterjee, Probabilistic Automata on Infinite Words: Decidability and Undecidability Results, IST Austria, 2009.' date_created: 2018-12-12T11:39:04Z date_published: 2009-11-02T00:00:00Z date_updated: 2023-02-23T11:45:44Z day: '02' ddc: - '005' department: - _id: KrCh doi: 10.15479/AT:IST-2009-0004 file: - access_level: open_access checksum: fb7563150231325b00b1718d956f687b content_type: application/pdf creator: system date_created: 2018-12-12T11:54:08Z date_updated: 2020-07-14T12:46:43Z file_id: '5530' file_name: IST-2009-0004_IST-2009-0004.pdf file_size: 311065 relation: main_file file_date_updated: 2020-07-14T12:46:43Z has_accepted_license: '1' language: - iso: eng month: '11' oa: 1 oa_version: Published Version page: '17' publication_identifier: issn: - 2664-1690 publication_status: published publisher: IST Austria pubrep_id: '28' related_material: record: - id: '3857' relation: later_version status: public status: public title: 'Probabilistic automata on infinite words: Decidability and undecidability results' type: technical_report user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2009' ... --- _id: '5395' abstract: - lang: eng text: 'We study observation-based strategies for partially-observable Markov decision processes (POMDPs) with omega-regular objectives. An observation-based strategy relies on partial information about the history of a play, namely, on the past sequence of observa- tions. We consider the qualitative analysis problem: given a POMDP with an omega-regular objective, whether there is an observation-based strategy to achieve the objective with probability 1 (almost-sure winning), or with positive probability (positive winning). Our main results are twofold. First, we present a complete picture of the computational complexity of the qualitative analysis of POMDPs with parity objectives (a canonical form to express omega-regular objectives) and its subclasses. Our contribution consists in establishing several upper and lower bounds that were not known in literature. Second, we present optimal bounds (matching upper and lower bounds) on the memory required by pure and randomized observation-based strategies for the qualitative analysis of POMDPs with parity objectives and its subclasses.' alternative_title: - IST Austria Technical Report author: - first_name: Krishnendu full_name: Chatterjee, Krishnendu id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87 last_name: Chatterjee orcid: 0000-0002-4561-241X - first_name: Laurent full_name: Doyen, Laurent last_name: Doyen - first_name: Thomas A full_name: Henzinger, Thomas A id: 40876CD8-F248-11E8-B48F-1D18A9856A87 last_name: Henzinger orcid: 0000−0002−2985−7724 citation: ama: Chatterjee K, Doyen L, Henzinger TA. Qualitative Analysis of Partially-Observable Markov Decision Processes. IST Austria; 2009. doi:10.15479/AT:IST-2009-0001 apa: Chatterjee, K., Doyen, L., & Henzinger, T. A. (2009). Qualitative analysis of partially-observable Markov decision processes. IST Austria. https://doi.org/10.15479/AT:IST-2009-0001 chicago: Chatterjee, Krishnendu, Laurent Doyen, and Thomas A Henzinger. Qualitative Analysis of Partially-Observable Markov Decision Processes. IST Austria, 2009. https://doi.org/10.15479/AT:IST-2009-0001. ieee: K. Chatterjee, L. Doyen, and T. A. Henzinger, Qualitative analysis of partially-observable Markov decision processes. IST Austria, 2009. ista: Chatterjee K, Doyen L, Henzinger TA. 2009. Qualitative analysis of partially-observable Markov decision processes, IST Austria, 20p. mla: Chatterjee, Krishnendu, et al. Qualitative Analysis of Partially-Observable Markov Decision Processes. IST Austria, 2009, doi:10.15479/AT:IST-2009-0001. short: K. Chatterjee, L. Doyen, T.A. Henzinger, Qualitative Analysis of Partially-Observable Markov Decision Processes, IST Austria, 2009. date_created: 2018-12-12T11:39:05Z date_published: 2009-09-09T00:00:00Z date_updated: 2023-02-23T11:45:39Z day: '09' ddc: - '005' department: - _id: KrCh - _id: ToHe doi: 10.15479/AT:IST-2009-0001 file: - access_level: open_access checksum: 04d9cc065cc19598a4e8631c47f1a562 content_type: application/pdf creator: system date_created: 2018-12-12T11:53:25Z date_updated: 2020-07-14T12:46:43Z file_id: '5486' file_name: IST-2009-0001_IST-2009-0001.pdf file_size: 342088 relation: main_file file_date_updated: 2020-07-14T12:46:43Z has_accepted_license: '1' language: - iso: eng month: '09' oa: 1 oa_version: Published Version page: '20' publication_identifier: issn: - 2664-1690 publication_status: published publisher: IST Austria pubrep_id: '31' related_material: record: - id: '3855' relation: later_version status: public status: public title: Qualitative analysis of partially-observable Markov decision processes type: technical_report user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2009' ...