Now showing items 7-26 of 1009

  • A robust scheme for multilevel extendible hashing 

    Helmer, S; Neumann, T; Moerkotte, G (SpringerSpringer Verlag (Germany), 2003)
    Dynamic hashing, while surpassing other access methods for uniformly distributed data, usually performs badly for non-uniformly distributed data. We propose a robust scheme for multi-level extendible hashing, allowing ...
  • A-priori verification of web services with abduction 

    Alberti M; Chesani F; Gavanelli M; Lamma E; Mello P; Montali M (CILC, 2006)
    Although stemming from very different research areas, Multi-Agent Systems (MAS) and Service Oriented Computing (SOC) share common topics, problems and settings. A common problem is the need to formally verify the conformance ...
  • Abducing Compliance of Incomplete Event Logs 

    Chesani F; De Masellis R; Di Francescomarino C; Ghidini C; Mello P; Montali M; Tessaris S (Springer, 2016)
    The capability to store data about business processes execution in so-called Event Logs has brought to the diffusion of tools for the analysis of process executions and for the assessment of the goodness of a process model. ...
  • Abducing Workflow Traces: a General Framework to Manage Incompleteness in Business Processes (Short Paper) 

    Chesani F; De Masellis R; Di Francescomarino C; Ghidini C; Mello P; Montali M; Tessaris S (IOS Press, 2016)
    The capability to store data about Business Process executions in so-called Event Logs has brought to the identification of a range of key reasoning services (consistency, compliance, runtime monitoring, prediction) for ...
  • Abduction for specifying and verifying web service choreographies 

    Alberti, M; Chesani, F; Gavanelli, M; Lamma, E; Mello, M; Montali, M; Storari, S (AISC, 2006)
    Global choreographies have been recently proposed as a way for specifying the overall behaviour of a system composed of heterogeneous web services. In this work, we propose an abductive framework based on computational ...
  • An abductive framework for a-priori verification of web services 

    Alberti, M; Chesani, F; Gavanelli, M; Lamma, E; Mello, P; Montali, M (ACM Press, 2006)
    Although stemming from very different research areas, Multi-Agent Systems (MAS) and Service Oriented Computing (SOC) share common topics, problems and settings. One of the common problems is the need to formally verify the ...
  • Abductive Reasoning on Compliance Monitoring - Balancing Flexibility and Regulation 

    Chesani F; Mello P; Montali M (Springer, 2017)
    Many emerging applications in Business Process Management, Clinical Guidelines, Service-Oriented and Multi-Agent Systems, are characterized by distribution, complex interaction and coordination dynamics. Such domains, ...
  • About Subsumption in Fuzzy EL 

    Borgwardt, S; Peñaloza, R (CEUR, 2013)
    The Description Logic EL is used to formulate several large biomedical ontologies. Fuzzy extensions of EL can express the vagueness inherent in many biomedical concepts. We consider fuzzy EL with semantics based on general ...
  • Acquiring user profiles from implicit feedback in a conversational recommender system 

    Blanco H; Ricci F (ACM, 2013)
    Query revisions in a conversational system can be efficiently computed by assuming that the profiles of the potential users are in a predefined, a priori known and finite set. However, without any additional knowledge of ...
  • Action Prediction Models for Recommender Systems Based on Collaborative Filtering and Sequence Mining Hybridization 

    Gurbanov T; Ricci F (ACM, 2017)
    Many recommender systems collect online users' activity and infer from it users' preferences. They record user actions of various types (e.g. clicks, views), and predict unknown, possibly future, interactions between users ...
  • Actions and programs over description logic ontologies 

    Calvanese, D; Lenzerini, M; Riccardo, R; De Giacomo, G (Bozen-Bolzano University Press, 2007)
    We aim at representing and reasoning about actions and (high level) programs over ontologies expressed in Description Logics. This is a critical issue that has resisted good solutions for a long time. In particular, while ...
  • An active learning and training environment for database programming 

    Pahl C; Kenny C (Association for the Advancement of Computers in Education, 2005)
    Active learning facilitated through interactive, self-controlled learning environments differs substantially from traditional instructor-oriented, classroom-based teaching. We present a tool for database programming that ...
  • Active Learning in Collaborative Filtering Recommender Systems 

    Elahi M; Ricci F; Rubens N (Springer, 2014)
    In Collaborative Filtering Recommender Systems user's preferences are expressed in terms of rated items and each rating allows to improve system prediction accuracy. However, not all of the ratings bring the same amount ...
  • Adapting to natural rating acquisition with combined active learning strategies 

    Elahi M; Ricci F; Rubens N (Springer, 2012)
    The accuracy of collaborative-filtering recommender systems largely depends on the quantity and quality of the ratings added to the system over time. Active learning (AL) aims to improve the quality of ratings by selectively ...
  • Adaptive active learning in recommender systems 

    Elahi M (Springer, 2011)
    Recommender Systems (RSs) generate personalized suggestions to users for items that may be interesting for them. Many RSs use the Collaborative Filtering (CF) technique, where the system gathers some information about the ...
  • An adaptive finite element method for the infinity Laplacian 

    Lakkis O; Pryer T (Springer International Publishing, 2015)
    We construct a finite element method (FEM) for the infinity Laplacian. Solutions of this problem are well known to be singular in nature so we have taken the opportunity to conduct an a posteriori analysis of the method ...
  • Adaptive finite elements for semilinear reaction-diffusion systems on growing domains 

    Venkataraman C; Lakkis O; Madzvamuse A (Springer Berlin Heidelberg, 2013)
    We propose an adaptive finite element method to approximate the solutions to reaction-diffusion systems on time-dependent domains and surfaces. We derive a computable error estimator that provides an upper bound for the ...
  • Adaptive Model for Background Extraction Using Depth Map 

    Sun BY; Tillo T; Xu M (SPRINGER, 2015)
    Depth map has attracted great attention for image and video processing in recent years. Depth map gives one more dimensional information about the images besides color (intensity). Depth is independent of color, which is ...
  • Add Data into Business Process Verification: Bridging the Gap between Theory and Practice 

    De Masellis R; Di Francescomarino C; Ghidini C; Montali M; Tessaris S (AAAI press, 2017)
    The need to extend business process languages with the capability to model complex data objects along with the control flow perspective has lead to significant practical and theoretical advances in the field of Business ...
  • Adding context to Knowledge and Action Bases 

    Calvanese D; Ceylan I; Montali M; Santoso A (arXiv.org e-Print archive, 2014)
    Knowledge and Action Bases (KABs) have been recently proposed as a formal framework to capture the dynamics of systems which manipulate Description Logic (DL) Knowledge Bases (KBs) through action execution. In this work, ...