Browsing by Subject "Information retrieval"

Now showing items 21-35 of 35

    • Conference Object  

      Model matching for Web Services on context dependencies 

      Kapitsaki, Georgia M.; Achilleos, Achilleas P. (2012)
      Model matching has been applied to different fields of Model Driven Engineering research and usually concerns models depicting the same information in order to detect their evolution process or elements on which model ...
    • Conference Object  

      Model-driven development of composite web applications 

      Kapitsaki, Georgia M.; Kateros, D. A.; Pappas, C. A.; Tselikas, N. D.; Venieris, Iakovos St (2008)
      As the number of available web services increases, the development of web applications that integrate existing web services becomes more and more popular. This class of web applications can be seen as the composition of ...
    • Article  

      Multi-set DHT for range queries on dynamic data for grid information service 

      Da Costa, G.; Orlando, S.; Dikaiakos, Marios D. (2008)
      Scalability is a fundamental problem for information systems when the amount of managed data increases. Peer to Peer systems are usually used to solve scalability problems as centralized approaches do not scale without ...
    • Conference Object  

      On constructing internet-scale P2P information retrieval systems 

      Zeinalipour-Yazdi, Constantinos D.; Kalogeraki, Vana; Gunopulos, Dimitrios (2005)
      We initiate a study on the effect of the network topology on the performance of Peer-to-Peer (P2P) information retrieval systems. The emerging P2P model has become a very powerful and attractive paradigm for developing ...
    • Conference Object  

      PCP: Privacy-aware Context Profile towards context-aware application development 

      Kapitsaki, Georgia M.; Venieris, Iakovos St (2008)
      Context-awareness constitutes an important aspect in mobile environments, especially when user-centric services are considered. However, user and service related data as part of context information are sensitive and their ...
    • Article  

      pFusion: A P2P architecture for internet-scale content-based search and retrieval 

      Zeinalipour-Yazdi, Constantinos D.; Kalogeraki, Vana; Gunopulos, Dimitrios (2007)
      The emerging Peer-to-Peer (P2P) model has become a very powerful and attractive paradigm for developing Internet-scale systems for sharing resources, including files and documents. The distributed nature of these systems, ...
    • Conference Object  

      Position paper: Applying model-driven engineering for linking web service and context models 

      Kapitsaki, Georgia M.; Achilleos, Achilleas P. (2011)
      Context-awareness is gaining wide importance, especially when targeting pervasive environments, whereas Web Services are often exploited as building blocks of context-aware applications because of their interoperability ...
    • Article  

      Power efficiency through tuple ranking in wireless sensor network monitoring 

      Andreou, Panayiotis G.; Zeinalipour-Yazdi, Constantinos D.; Chrysanthis, Panos K.; Samaras, George S. (2011)
      In this paper, we present an innovative framework for efficiently monitoring Wireless Sensor Networks (WSNs). Our framework, coined KSpot, utilizes a novel top-k query processing algorithm we developed, in conjunction with ...
    • Article  

      Probabilistic approaches to fault detection in networked discrete event systems 

      Athanasopoulou, E.; Hadjicostis, Christoforos N. (2005)
      In this paper, we consider distributed systems that can be modeled as finite state machines with known behavior under fault-free conditions, and we study the detection of a general class of faults that manifest themselves ...
    • Article  

      Prognosis of pregnancy-associated breast cancer: A meta-analysis of 30 studies 

      Jr, H. A. Azim; Santoro, L.; Russell-Edu, W.; Pentheroudakis, George; Pavlidis, Nicholas; Peccatori, Fedro A. (2012)
      Background: Pregnancy-associated breast cancer (PABC) is relatively rare with considerable controversy regarding its prognosis. Patients & methods: Two of the authors independently performed a literature search with no ...
    • Article  

      Randomised trials comparing chemotherapy regimens for advanced non-small cell lung cancer: Biases and evolution over time 

      Ioannidis, J. P. A.; Polycarpou, A.; Ntais, C.; Pavlidis, Nicholas (2003)
      We systematically evaluated the evidence from randomised trials comparing various chemotherapy regimens for advanced non-small cell lung cancer. Across 254 eligible trials (42 661 patients), no regimens were compared in ...
    • Conference Object  

      A scalable hash-based mobile agent location mechanism 

      Kastidou, G.; Pitoura, Evaggelia 1967-; Samaras, George S. (Institute of Electrical and Electronics Engineers Inc., 2003)
      In this paper, we propose a novel mobile agent tracking mechanism based on hashing. To allow our system to adapt to variable workloads, dynamic rehashing is supported The proposed mechanism scales well with both the number ...
    • Conference Object  

      The threshold join algorithm for top-k queries in distributed sensor networks 

      Zeinalipour-Yazdi, Constantinos D.; Vagena, Zografoula; Gunopulos, Dimitrios; Kalogeraki, Vana; Tsotras, Vassilis J.; Vlachos, Michail; Koudas, Nick; Srivastava, D. (2005)
      In this paper we present the Threshold Join Algorithm (TJA), which is an efficient TOP-k query processing algorithm for distributed sensor networks. The objective of a top-k query is to find the k highest ranked answers ...
    • Article  

      Validation and interpretation of Web users' sessions clusters 

      Pallis, George C.; Angelis, Lefteris; Vakali, Athena I. (2007)
      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 ...
    • Conference Object  

      Wireless data broadcast in systems of hierarchical cellular organization 

      Vlajic, N.; Charalambous, Charalambos D.; Makrakis, D. (2003)
      In recent years, both wireless data broadcast (WDB) and hierarchical cell structure (HCS) have attracted the attention of the scientific community, yet they have been treated as entirely separate research topics. This paper ...