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Searching for authors named "Lefteris Angelis" – sorted by Relevance.

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Help! 13 documents found, showing 1 through 10. Next 10 →
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  • A Simulated Annealing Approach for Multimedia Data Placement  
  • by Evimaria Terzi, Athena Vakali, Lefteris Angelis — 2004
  • …Multimedy applications arecharacterized bytheir strong timing requirementsand constraintsand thusmultimedy dul storage is a critical issue in the overall system's performanceand functionality. This paperdpery)%% multimedfi dul representationmodre that e#ectivelyguid dec placementtoward the improveme…
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  • Performance and Effectiveness Trade-Off for Checkpointing in Fault Tolerant Distributed Systems  
  • by Panagiotis Katsaros, Lefteris Angelis, Constantine Lazos — 2006
  • …Checkpointing has a crucial impact on systems' performance and fault tolerance effectiveness: excessive checkpointing results in performance degradation, while deficient checkpointing incurs expensive recovery. In distributed systems with independent checkpoint activities there is no easy way to det…
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  • Clustering Classifiers for Knowledge Discovery from Physically Distributed Databases  
  • by Grigorios Tsoumakas, Lefteris Angelis, Ioannis Vlahavas — 2004 — Data & Knowledge Engineering
  • …Most distributed classification approaches view data distribution as a technical issue and combine local models aiming at a single global model. This however, is unsuitable for inherently distributed databases, which are often described by more than one classification models that might di#er concept…
  • Cited by 3 (1 self) – Add To MetaCart
  • Simulation Metamodeling for the Design of Reliable Object Based Systems  
  • by Panagiotis Katsaros, Lefteris Angelis, Constantine Lazos — 2004 — Proceedings of the EUROSIM 2004 Congress, EUROSIM
  • …Replication is a suitable approach for the provision of fault tolerance and load balancing in distributed systems. Object replication takes place on the basis of well-designed interaction protocols that preserve object state consistency in an application transparent manner. The published analytic pe…
  • Cited by 1 (0 self) – Add To MetaCart
  • Applied Multiresponse Metamodeling for Queuing Network Simulation Experiments: Problems and Perspectives  
  • by Panagiotis Katsaros, Lefteris Angelis, Constantine Lazos — 2001 — Proc. of the 4th EUROSIM Congress on Modelling and Simulation, EUROSIM, Delfts, The Netherlands
  • …A complete performance evaluation study of a simulated system should consider possible alternatives and response predictions to potential parameter changes. Simulation sensitivity analysis and metamodeling constitute an efficient approach for this kind of problems. However, this approach is usually …
  • Cited by 6 (5 self) – Add To MetaCart
  • A probabilistic validation algorithm for Web users’ clusters  
  • by George Pallis, Lefteris Angelis, Athena Vakali — 2004 — In Proceedings of the IEEE international conference on systems, man and cybernetics (SMC
  • …Abstract – Cluster analysis is one of the most important aspects in the data mining process for discovering groups and identifying interesting distributions or patterns over the considered data sets. In the context of Web data mining, model-based clustering algorithms are often used to cluster simil…
  • Cited by 2 (1 self) – Add To MetaCart
  • A study on workload characterization for a Web proxy server  
  • by George Pallis, Athena Vakali, Lefteris Angelis, Saïd Hacid — 2003 — Proceedings of the 21st IASTED International MultiConference on Applied Informatics (AI
  • …The popularity of the World-Wide-Web has increased dramatically in the past few years. Web proxy servers have an important role in reducing server loads, network traffic, and client request latencies. This paper presents a detailed workload characterization study of a busy Web proxy server. The stud…
  • Cited by 1 (0 self) – Add To MetaCart
  • Selective fusion of heterogeneous classifiers  
  • by Grigorios Tsoumakas, Lefteris Angelis, Ioannis Vlahavas — Intelligent Data Analysis
  • …There are two main paradigms in combining different classification algorithms: Classifier Selection and Classifier Fusion. The first one selects a single model for classifying a new instance, while the lat-ter combines the decisions of all models. The work presented in this paper stands in between t…
  • Cited by 2 (0 self) – Add To MetaCart
  • Validation and interpretation of Web users ’ sessions clusters Abstract  
  • by George Pallis, Lefteris Angelis, Athena Vakali — 2006
  • …Understanding users ’ navigation on the Web is important towards improving the quality of information and the speed of accessing large-scale Web data sources. Clustering of users ’ navigation into sessions has been proposed in order to identify patterns and similarities which are then managed in the…
  • Cited by 1 (0 self) – Add To MetaCart
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