Now showing items 291-310 of 1009

  • Evaluation of main memory join algorithms for joins with subset join predicates 

    Helmer, S; Moerkotte, G (Morgan Kaufmann Publishers, 1997)
    Current data models like the NF2 model and object-oriented models support set-valued attributes. Hence, it becomes possible to have join predicates based on set comparison. This paper introduces and evaluates two main ...
  • An evaluation of scaffolding for virtual interactive tutorials 

    Pahl C (Association for the Advancement of Computers in Education, 2002)
    Scaffolding refers to a temporary support framework used during construction. Applied to teaching and learning it describes measures to support a learner to become confident and self-reliant in a subject. In a Web environment ...
  • Evaluation of usage patterns for web-based educational systems using web mining 

    Donnellan D; Pahl C (MCIL, 2001)
    Virtual courses often separate teacher and student physically from one another, resulting in less direct feedback. The evaluation of virtual courses and other computer-supported educational systems is therefore of major ...
  • An Evaluation of {VIG} with the {BSBM} Benchmark 

    Lanti D; Xiao G; Calvanese D (CEUR, 2016)
    We present an experimental evaluation of VIG, a data scaler for OBDA benchmarks. Data scaling is a relatively recent approach, proposed in the database community, that allows for scaling an input data instance to $s$ times ...
  • The Even More Irresistible SROIQ 

    Horrocks, I; Kutz, O; Sattler, U (AAAI Press, 2006)
    We describe an extension of the description logic underlying OWL-DL, SHOIN, with a number of expressive means that we believe will make it more useful in practise. Roughly speaking, we extend SHOIN with all expressive means ...
  • Event condition expectation (ECE-) rules for monitoring observable systems 

    Bragaglia S; Chesani F; Fry E; Mello P; Montali M; Sottara D (Springer, 2011)
    The standardization and broad adoption of Service Oriented Architectures, Web Services, and Cloud Computing is raising the complexity of ICT systems. Hence, assuring correct system behavior with regard to established design ...
  • An Event Detection Framework Supported by a Smart Graphical User Interface 

    Persia F; Helmer S (IEEE, 2016)
    We develop a graphical user interface for defining events in a framework for detecting high-level surveillance events from a video stream, as the language used for the events may be too complex for an ordinary user. The ...
  • Evolution of design patterns: a replication study 

    Rossi, B; Russo, B (ACM, 2014)
    Context. In 2007, Aversano et al. [2] analysed the evolution of JHotDraw, ArgoUML, and Eclipse JDT b.tween years 2000-2005 to understand the role of frequently changed design patterns. Goal. In this paper, we perform a ...
  • Evolution of DL-Lite Knowledge Bases 

    Calvanese, D; Kharlamov, E; Nutt, W; Zheleznyakov, D (Springer, 2010)
    We study the problem of evolution for Knowledge Bases (KBs) expressed in Description Logics (DLs) of the DL-Lite family. DL-Lite is at the basis of OWL 2 QL, one of the tractable fragments of OWL 2, the recently proposed ...
  • The Evolution of Project Inter-dependencies in a Software Ecosystem: The Case of Apache 

    Bavota G; Canfora G; Di Penta M; Oliveto R; Panichella S (IEEE, 2013)
    Software ecosystems consist of multiple software projects, often interrelated each other by means of dependency relations. When one project undergoes changes, other projects may decide to upgrade the dependency. For example, ...
  • The evolving design of tangibles for graph algorithmic thinking 

    Bonani A; Del Fatto V; Gennari R (Association for Computing Machinery, Inc, 2018)
    Algorithmic thinking is at the core of computational thinking. Tangible interactive solutions can help children develop algorithmic thinking skills. This paper focusses on exploratory research concerning tangibles for graph ...
  • Evolving Graph Databases under Description Logic Constraints 

    Calvanese D; Ortiz M; Simkus M (CEUR Electronic Workshop Proceedings, 2013)
    In the setting of graph-structured data, description logics are well suited to impose constraints that capture the semantics of the domain of interest. When the data evolves as a result of operations carried out by users ...
  • Exact Computation of Graph Edit Distance for Uniform and Non-uniform Metric Edit Costs 

    Blumenthal DB; Gamper J (Springer, 2017)
    The graph edit distance is a well-established and widely used distance measure for labelled, undirected graphs. However, since its exact computation is NP -hard, research has mainly focused on devising approximative ...
  • Exact Learning of EL Ontologies 

    Duarte M; Konev B; Ozaki A (RWTH, 2018)
    We present the learning algorithm underpinning ExactLearner, a tool for exactly learning and teaching EL terminologies. The algorithm is superpolynomial in the size of the concept expressions and vocabulary of the terminology, ...
  • Exchanging Description Logic Knowledge Bases 

    Arenas, M; Botoeva, E; Calvanese, D; Ryzhikov, V; Sherkhonov, E (AAAI Press, 2012)
    In this paper, we study the problem of exchanging knowledge between a source and a target knowledge base (KB), connected through mappings. Differently from the traditional database exchange setting, which considers only ...
  • Exchanging OWL 2 QL Knowledge Bases 

    Arenas M; Botoeva E; Calvanese D; Ryzhikov V (AAAI Press, 2013)
    Knowledge base exchange is an important problem in the area of data exchange and knowledge representation, where one is interested in exchanging information between a source and a target knowledge base connected through a ...
  • Expanding Wikidata's Parenthood Information by 178%, or How To Mine Relation Cardinality Information 

    Mirza P; Razniewski S; Nutt W (CEUR, 2016)
    While so far automated knowledge base construction has largely focused on fully qualified facts, e.g., , the Web contains also extensive amounts of existential information in the form of cardinality assertions, e.g., that ...
  • An experience-based BDI logic: Motivating shared experiences and intentionality 

    Osman N; D'Inverno M; Sierra C; Amgoud L; Prade H; Yee-King M; Confalonieri R; De Jonge D; Hazelden K (IEEE, 2013)
    This paper proposes the notion of experience to help situate agents in their environment, providing a link on how the continually evolving environment impacts the evolution of an agent's BDI model and vice versa. Then, ...
  • Experiencing a New Method in Teaching Databases using Blended eXtreme Apprenticeship 

    Dodero, G; Lena, R; Del Fatto, V (Knowledge Systems Institute, 2015)
    The traditional approach of teaching Databases requires a great effort on the initial aspects of modeling and design that can negatively affect student’s motivation. This consideration led us to propose a method able to ...
  • Explaining recommendations of Movies in Web Video Rental Businesses 

    Symeonidis P; Manolopoulos Y (NA, 2011)
    Have you ever watched a movie that somebody recommended to you, and felt you wasted your time? If yes, for sure you have wished that there was a way to get, along with the recommendation, the reasoning behind it. Providing ...