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Sökning: LAR1:hh > Högskolan i Halmstad

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41.
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42.
  • Abuella, Mohamed, 1980-, et al. (författare)
  • Data-Driven Explainable Artificial Intelligence for Energy Efficiency in Short-Sea Shipping
  • 2023
  • Ingår i: Machine Learning and Knowledge Discovery in Databases. - Cham : Springer. - 9783031434297 - 9783031434303 ; , s. 226-241
  • Konferensbidrag (refereegranskat)abstract
    • The maritime industry is under pressure to increase energy efficiency for climate change mitigation. Navigational data, combining vessel operational and environmental measurements from onboard instruments and external sources, are critical for achieving this goal. Short-sea shipping presents a unique challenge due to the significant influence of surrounding landscape characteristics. With high-resolution onboard data increasingly accessible through IoT devices, appropriate data representations and AI/ML analytical tools are needed for effective decision support. The aim of this study is to investigate the fuel consumption estimation model’s role in developing an energy efficiency decision support tool. ML models that lacking explainability may neglect important factors and essential constraints, such as the need to meet arrival time requirements. Onboard weather measurements are compared to external forecasts, and our findings demonstrate the necessity of eXplainable Artificial Intelligence (XAI) techniques for effective decision support. Real-world data from a short-sea passenger vessel in southern Sweden, consisting of 1754 voyages over 15 months (More of data description and code sources of this study can be found in the GitHub repository at https://github.com/MohamedAbuella/ST4EESSS), are used to support our conclusions.  © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.
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43.
  • Abuella, Mohamed, Postdoktor, 1980-, et al. (författare)
  • Spatial Clustering Approach for Vessel Path Identification
  • 2024
  • Ingår i: IEEE Access. - Piscataway, NJ : IEEE. - 2169-3536. ; 12, s. 66248-66258
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper addresses the challenge of identifying the paths for vessels with operating routes of repetitive paths, partially repetitive paths, and new paths. We propose a spatial clustering approach for labeling the vessel paths by using only position information. We develop a path clustering framework employing two methods: a distance-based path modeling and a likelihood estimation method. The former enhances the accuracy of path clustering through the integration of unsupervised machine learning techniques, while the latter focuses on likelihood-based path modeling and introduces segmentation for a more detailed analysis. The result findings highlight the superior performance and efficiency of the developed approach, as both methods for clustering vessel paths into five clusters achieve a perfect F1-score. The approach aims to offer valuable insights for route planning, ultimately contributing to improving safety and efficiency in maritime transportation. © 2013 IEEE.
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44.
  • Aceto, Luca, et al. (författare)
  • A Rule Format for Unit Elements
  • 2009
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • This paper offers a meta-theorem for languages with a Structural Operational Semantics (SOS) in the style of Plotkin. Namely, it proposes a generic rule format for SOS guaranteeing that certain constants act as left- or right-unit elements for a set of binary operators. We show the generality of our format by applying it to a wide range of operators from the literature on process calculi.
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45.
  • Aceto, Luca, et al. (författare)
  • A rule format for unit elements
  • 2010
  • Ingår i: SOFSEM 2010. - Berlin : Springer Berlin/Heidelberg. - 9783642112652 - 9783642112669 ; , s. 141-152
  • Konferensbidrag (refereegranskat)abstract
    • This paper offers a meta-theorem for languages with a Structural Operational Semantics (SOS) in the style of Plotkin. Namely, it proposes a generic rule format for SOS guaranteeing that certain constants act as left- or right-unit elements for a set of binary operators. We show the generality of our format by applying it to a wide range of operators from the literature on process calculi.
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46.
  • Aceto, Luca, et al. (författare)
  • Algebraic properties for free!
  • 2009
  • Ingår i: Bulletin of the European Association for Theoretical Computer Science. - : European Association for Theoretical Computer Science. - 0252-9742. ; 99, s. 81-103
  • Tidskriftsartikel (refereegranskat)abstract
    • Algebraic properties specify some natural properties of programming and specification constructs. This paper provides an overview of techniques to guarantee or generate algebraic properties of language constructs by investigating the syntactic shape of the deduction rules defining their operational semantics.
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47.
  • Aceto, Luca, et al. (författare)
  • Decompositional Reasoning about the History of Parallel Processes
  • 2010
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • Decompositional reasoning aims at automatically decomposing a global property of a composite system into local properties of (possibly unknown) components. In concurrency theory, decompositional reasoning techniques date back to the seminal work of Larsen and Liu in the late 1980s and early 1990s. However, we are not aware of any such decomposition technique that applies to reasoning about the "past". In this paper, we address this problem and present a decomposition technique for Hennessy-Milner logic with past and its extension with recursively defined formulae. As a language for processes, we use a subset of Milner's CCS with parallel composition, non-deterministic choice, action prefixing and the inaction constant. We focus on developing decompositional reasoning techniques for parallel contexts in that language.
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48.
  • Aceto, L., et al. (författare)
  • Decompositional Reasoning about the History of Parallel Processes
  • 2011
  • Ingår i: Fundamentals of software engineering. - Heidelberg : Springer Berlin/Heidelberg. - 1611-3349 .- 0302-9743. - 9783642293191 - 9783642293207 ; , s. 32-47
  • Konferensbidrag (refereegranskat)abstract
    • This paper presents a decomposition technique for Hennessy-Milner logic with past and its extension with recursively defined formulae. In order to highlight the main ideas and technical tools, processes are described using a subset of CCS with parallel composition, nondeterministic choice, action prefixing and the inaction constant. The study focuses on developing decompositional reasoning techniques for parallel contexts in that language. © 2012 Springer-Verlag.
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49.
  • Aceto, Luca, et al. (författare)
  • Exploiting Algebraic Laws to Improve Mechanized Axiomatizations
  • 2013
  • Ingår i: Algebra and Coalgebra in Computer Science. - Berlin : Springer Berlin/Heidelberg. - 9783642402067 - 9783642402050 ; , s. 36-50
  • Konferensbidrag (refereegranskat)abstract
    • In the field of structural operational semantics (SOS), there have been several proposals both for syntactic rule formats guaranteeing the validity of algebraic laws, and for algorithms for automatically generating ground-complete axiomatizations. However, there has been no synergy between these two types of results. This paper takes the first steps in marrying these two areas of research in the meta-theory of SOS and shows that taking algebraic laws into account in the mechanical generation of axiomatizations results in simpler axiomatizations. The proposed theory is applied to a paradigmatic example from the literature, showing that, in this case, the generated axiomatization coincides with a classic hand-crafted one. © 2013 Springer-Verlag Berlin Heidelberg.
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50.
  • Aceto, Luca, et al. (författare)
  • Impossibility results for the equational theory of timed CCS
  • 2007
  • Ingår i: Algebra and Coalgebra in Computer Science. - Berlin : Springer Berlin/Heidelberg. - 9783540738572 - 9783540738596 ; , s. 80-95
  • Konferensbidrag (refereegranskat)abstract
    • We study the equational theory of Timed CCS as proposed by Wang Yi in CONCUR'90. Common to Wang Yi's paper, we particularly focus on a class of linearly-ordered time domains exemplified by the positive real or rational numbers. We show that, even when the set of basic actions is a singleton, there are parallel Timed CCS processes that do not have any sequential equivalent and thus improve on the Gap Theorem for Timed CCS presented by Godskesen and Larsen in FSTTCS'92. Furthermore, we show that timed bisimilarity is not finitely based both for single-sorted and two-sorted presentations of Timed CCS. We further strengthen this result by showing that, unlike in some other process algebras, adding the untimed or the timed left-merge operator to the syntax and semantics of Timed CCS does not solve the axiomatizability problem.
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