--- _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' ...