140 results found
Sergot M, 2022, Actual Cause and Chancy Causation in Stit: A Preliminary Account, Synthese Library, Pages: 21-42
The paper investigates how actual cause may be treated in ‘seeing to it that’ (‘stit’) logics, that is, determining when the actions of a particular agent, or a particular set of agents collectively, can be said to be the cause of a given outcome in given circumstances. There are two complementary problems: (1) the outcome is brought about by the actions of some set of agents and the task is to identify which of these agents are essential to that bringing about, and (2) the outcome depends partly on chance and the task is to identify which agents could have acted differently and thereby ensured a different outcome. The final part of the paper discusses briefly the need to account for causal and other dependences between the actions of agents, and how that might be done without abandoning the ‘stit’ framework altogether.
Sergot M, 2021, Some Forms of Collectively Bringing About or 'Seeing to it that', JOURNAL OF PHILOSOPHICAL LOGIC, Vol: 50, Pages: 249-283, ISSN: 0022-3611
Kulicki P, Trypuz R, Sergot M, 2020, Who is obliged when many are involved? Labelled transition system modelling of how obligation arises, ARTIFICIAL INTELLIGENCE AND LAW, Vol: 29, Pages: 395-415, ISSN: 0924-8463
Evans R, Sergot M, Stephenson A, 2020, Formalizing Kant's Rules A Logic of Conditional Imperatives and Permissives, JOURNAL OF PHILOSOPHICAL LOGIC, Vol: 49, Pages: 613-680, ISSN: 0022-3611
Evans R, Hernández-Orallo J, Welbl J, et al., 2020, Evaluating the Apperception Engine., CoRR, Vol: abs/2007.05367
An ‘open’ Multi-Agent System (MAS) is a system in which the member agents are developed by different parties and serve different, often competing interests. In open MAS, the behaviour of an agent cannot be predicted in advance (Hewitt 1991). Furthermore, an agent may choose not to conform to the MAS specification in order to achieve its individual goals, or it may fail to conform to the MAS specification due to, say, a bug in its code (Sergot 2004). Agents may also fail to behave as intended because of factors beyond their control. This is commonplace when open MAS are deployed on distributed environments with unreliable communication channels. A few examples of this type of MAS are electronic marketplaces, virtual organisations and digital media rights management applications.
Artikis A, Sergot M, Paliouras G, 2015, An Event Calculus for Event Recognition, IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING, Vol: 27, Pages: 895-908, ISSN: 1041-4347
Artikis A, Sergot MJ, Paliouras G, 2015, Reactive Reasoning with the Event Calculus., CoRR, Vol: abs/1505.05364
Sergot M, 2014, Some Examples Formulated in a 'Seeing to It That' Logic: Illustrations, Observations, Problems, Editors: Muller, Publisher: SPRINGER INT PUBLISHING AG, Pages: 223-256, ISBN: 978-3-319-01753-2
Bin Goh WW, Sergot MJ, Sng JCG, et al., 2013, "Comparative Network-Based Recovery Analysis and Proteomic Profiling of Neurological Changes in Valproic AcidTreated Mice" (vol 12, pg 2116, 2013), JOURNAL OF PROTEOME RESEARCH, Vol: 12, Pages: 4650-4650, ISSN: 1535-3893
Goh WW, Sergot MJ, Sng JC, et al., 2013, Correction to "Comparative Network-Based Recovery Analysis and Proteomic Profiling of Neurological Changes in Valproic Acid-Treated Mice", J Proteome Res
Bin Goh WW, Sergot MJ, Sng JC, et al., 2013, Comparative Network-Based Recovery Analysis and Proteomic Profiling of Neurological Changes in Valproic Acid-Treated Mice, JOURNAL OF PROTEOME RESEARCH, Vol: 12, Pages: 2116-2127, ISSN: 1535-3893
Artikis A, Sergot M, Paliouras G, 2013, A logic-based approach to activity recognition, Human Behavior Recognition Technologies: Intelligent Applications for Monitoring and Security, Pages: 1-13, ISBN: 9781466636828
The authors have been developing a system for recognising human activities given a symbolic representation of video content. The input of the system is a stream of time-stamped short-term activities detected on video frames. The output of the system is a set of recognised long-term activities, which are pre-defined spatio-temporal combinations of short-term activities. The constraints on the short-term activities that, if satisfied, lead to the recognition of a long-term activity, are expressed using a dialect of the Event Calculus. The authors illustrate the expressiveness of the dialect by showing the representation of several typical complex activities. Furthermore, they present a detailed evaluation of the system through experimentation on a benchmark dataset of surveillance videos.
Bin Goh WW, Fan M, Low HS, et al., 2013, Enhancing the utility of Proteomics Signature Profiling (PSP) with Pathway Derived Subnets (PDSs), performance analysis and specialised ontologies, BMC GENOMICS, Vol: 14, ISSN: 1471-2164
Schulz C, Sergot M, Toni F, 2013, Argumentation-based answer set justification
We suggest a method for justifying why a literal is or is notcontained in the answer set of a logic program. This methodmakes use of argumentation theory, more precisely of stableASPIC+ extensions. We describe a way to translate a logicprogram into an ASPIC+ argumentation theory and investigate the relation between answer sets of the logic programand stable extensions of the translated ASPIC+ argumentation theory. The structure of ASPIC+ arguments with respectto a stable extension is then used for the justification of literalswith respect to an answer set. We also present an implementation of our justification method which displays justificationsas graphs.
Artikis A, Sergot M, Paliouras G, 2012, Run-time composite event recognition, Pages: 69-80
Events are particularly important pieces of knowledge, as they represent activities of special significance within an organisation: the automated recognition of events is of utmost importance. We present RTEC, an Event Calculus dialect for run-time event recognition and its Prolog implementation. RTEC includes a number of novel techniques allowing for efficient run-time recognition, scalable to large data streams. It can be used in applications where data might arrive with a delay from, or might be revised by, the underlying event sources. We evaluate RTEC using a real-world application. Copyright © 2012 ACM.
Bin Goh WW, Lee YH, Ramdzan ZM, et al., 2012, Proteomics Signature Profiling (PSP): A Novel Contextualization Approach for Cancer Proteomics, JOURNAL OF PROTEOME RESEARCH, Vol: 11, Pages: 1571-1581, ISSN: 1535-3893
Bin Goh WW, Oikawa H, Sng JCG, et al., 2012, The role of miRNAs in complex formation and control, BIOINFORMATICS, Vol: 28, Pages: 453-456, ISSN: 1367-4803
Goh WWB, Lee YH, Ramdzan ZM, et al., 2012, A network-based maximum link approach towards MS identifies potentially important roles for undetected ARRB1/2 and ACTB in liver cancer progression., Int J Bioinform Res Appl, Vol: 8, Pages: 155-170, ISSN: 1744-5485
Hepatocellular Carcinoma (HCC) ranks among the deadliest of cancers and has a complex etiology. Proteomics analysis using iTRAQ provides a direct way to analyse perturbations in protein expression during HCC progression from early- to late-stage but suffers from consistency and coverage issues. Appropriate use of network-based analytical methods can help to overcome these issues. We built an integrated and comprehensive Protein-Protein Interaction Network (PPIN) by merging several major databases. Additionally, the network was filtered for GO coherent edges. Significantly differential genes (seeds) were selected from iTRAQ data and mapped onto this network. Undetected proteins linked to seeds (linked proteins) were identified and functionally characterised. The process of network cleaning provides a list of higher quality linked proteins, which are highly enriched for similar biological process gene ontology terms. Linked proteins are also enriched for known cancer genes and are linked to many well-established cancer processes such as apoptosis and immune response. We found that there is an increased propensity for known cancer genes to be found in highly linked proteins. Three highly-linked proteins were identified that may play an important role in driving HCC progression - the G-protein coupled receptor signalling proteins, ARRB1/2 and the structural protein beta-actin, ACTB. Interestingly, both ARRB proteins evaded detection in the iTRAQ screen. ACTB was not detected in the original dataset derived from Mascot but was found to be strongly supported when we re-ran analysis using another protein detection database (Paragon). Identification of linked proteins helps to partially overcome the coverage issue in shotgun proteomics analysis. The set of linked proteins are found to be enriched for cancer-specific processes, and more likely so if they are more highly linked. Additionally, a higher quality linked set is derived if network-cleaning is performed prior. This
Toni F, Sergot M, 2011, Argumentation and answer set programming, Pages: 164-180, ISBN: 9783642208317
Argumentation and answer set programming are two of the main knowledge representation paradigms that have emerged from logic programming for non-monotonic reasoning. This paper surveys recent work on using answer set programming as a mechanism for computing extensions in argumentation. The paper also indicates some possible directions for future work. © 2011 Springer-Verlag Berlin Heidelberg.
Artikis A, Sergot M, Paliouras G, 2010, A logic programming approach to activity recognition, Pages: 3-8
We have been developing a system for recognising human activity given a symbolic representation of video content. The input of our system is a set of time-stamped short-term activities detected on video frames. The output of our system is a set of recognised long-term activities, which are pre-defined temporal combinations of short-term activities. The constraints on the short-term activities that, if satisfied, lead to the recognition of a long-term activity, are expressed using a dialect of the Event Calculus. We illustrate the expressiveness of the dialect by showing the representation of several typical complex activities. Furthermore, we present a detailed evaluation of the system through experimentation on a benchmark dataset of surveillance videos.
Artikis A, Sergot M, 2010, Executable specification of open multi-agent systems, LOGIC JOURNAL OF THE IGPL, Vol: 18, Pages: 31-65, ISSN: 1367-0751
Sergot M, 2010, Norms, Action and Agency in Multi-agent Systems, 10th International Conference on Deontic Logic in Computer Science, Publisher: SPRINGER-VERLAG BERLIN, Pages: 2-2, ISSN: 0302-9743
Artikis A, Sergot M, Pitt J, 2009, Specifying Norm-Governed Computational Societies, ACM Transactions on Computational Logic, Vol: 10, Pages: 1-42
Barker S, Sergot MJ, Wijesekera D, 2008, Status-Based Access Control, ACM TRANSACTIONS ON INFORMATION AND SYSTEM SECURITY, Vol: 12, ISSN: 1094-9224
Craven R, Sergot MJ, 2008, Agent strands in the action language nC+., Journal of Applied Logic, Vol: 6, Pages: 172-191, ISSN: 1570-8683
Sergot M, 2008, The logic of unwitting collective agency, Departmental Technical Report: 08/6, Publisher: Department of Computing, Imperial College London, 08/6
The paper is about the logic of expressions of the form `agent x bringsit about that A is the case', or `agent x is responsible for its being thecase that A', or `the actions of agent x are the cause of its being thecase that A'. Agents could be deliberative (human or computer) agents,purely reactive agents, or simple computational devices. The `brings itabout' modalities are intended to express unintentional, perhaps even accidental,consequences of an agent's actions, as well as possibly intentional(intended) ones. Since we make no assumptions at all about the reasoningor perceptual capabilities of the agents we refer to this form of agency as`unwitting'; unwitting can mean both inadvertent and unaware. The semanticalframework is a form of labelled transition system extended withan extra component that picks out the actions of a particular agent ina transition, or its `strand' as we call it. We de ne a modal languagefor talking about the actions of individual agents or groups of agents intransitions, including two de ned modalities of the (unwitting) `brings itabout' kind. The novel feature is the switch of attention from talkingabout an agent's bringing it about that a certain state of a airs existsto talking about an agent's bringing it about that a transition has a certainproperty. The middle part of the paper presents axiomatisations ofthe logic, and comments on relationships to other work, in particular onresemblances to Porn's (1977) logic of `brings it about'. The last partis concerned with characterisations of (unwitting) collective agency, thatis, the logic of expressions of the form `the set G of agents, collectivelythough perhaps unwittingly, brings it about that A'.
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