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Searching for authors named "Costas Vassilakis" – sorted by Relevance.

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  • An Optimisation Scheme for Coalesce/Valid Time Selection Operator Sequences  
  • by Costas Vassilakis — 2000 — SIGMOD Record
  • …Queries in temporal databases often employ the coalesce operator, either to coalesce results of projections, or data which are not coalesced upon storage. Therefore, the performance and the optimisation schemes utilised for this operator is of major importance for the performance of temporal DBMSs.…
  • Cited by 3 (0 self) – Add To MetaCart
  • Virtual museums for all: Employing game technology for edutainment  
  • by George Lepouras, Costas Vassilakis — 2004 — Virtual Reality
  • …Abstract. Museums have started to realise the potential of new technologies for the development of edutainment content and services for their visitors. Virtual reality technologies promise to offer a vivid, enjoyable experience to the museums guests, but the cost in time, effort and resources can pr…
  • Cited by 3 (0 self) – Add To MetaCart
  • Integrating E-Government Public Transactional Services Into Public Authority Workflows  
  • by Costas Vassilakis, George Lepouras, Stathis Rouvas, Panagiotis Georgiadis — 2004 — Electronic Government
  • …Documents submitted by citizens through electronic services, deployed in the context of e-government, must usually undergo processing by some organisational information system in order to complete the citizens' requests and for the reply to be returned to the citizen. The integration, however, o…
  • Cited by 1 (0 self) – Add To MetaCart
  • Temporal Extension to ODMG  
  • by Anya Sotiropoulou, Michael Souillard, Costas Vassilakis — 1998
  • …this paper we present a temporal extension to the ODMG standard, as this has been specified in the TOOBIS project. A Temporal Object Data Model, a Temporal Object Definition Language and a Temporal Object Query Language have been specified and have been proposed as extensions to the ODM, ODL and OQL…
  • Cited by 3 (0 self) – Add To MetaCart
  • A Comparative Study of Temporal DBMS Architectures  
  • by Costas Vassilakis, Panagiotis Georgiadis, Anna Sotiropoulou — 1996 — Proceedings of DEXA 96 workshop
  • …In the past years, a number of implementations of temporal DBMSs has been reported. Most of these implementations share a common feature, which is that they have been built as an extension to a snapshot DBMS. In this paper, we present three alternative design approaches that can be used for extendin…
  • Cited by 3 (1 self) – Add To MetaCart
  • Sotiropoulou: A comparative study of temporal DBMS architectures  
  • by Costas Vassilakis, Panagiotis Georgiadis, Anna Sotiropoulou — 1996 — Proceedings of DEXA 96 workshop
  • …Abstract: In the past years, a number of implementations of temporal DBMSs has been reported. Most of these implementations share a common feature, which is that they have been built as an extension to a snapshot DBMS. In this paper, we present three alternative design approaches that can be used fo…
  • Cited by 1 (1 self) – Add To MetaCart
  • Using parallelism and pipeline for the optimisation of join queries  
  • by Maria Spiliopoulou, Michalis Hatzopoulos, Costas Vassilakis — 1992 — Proc. 1992 PARLE Conf
  • …Abstract: In this study we present a technique for the parallel optimisation of join queries, that uses the offered coarse-grain parallelism of the underlying architecture in order to reduce the CPU-bound optimisation overhead. The optimisation technique performs an almost exhaustive search of the s…
  • Cited by 2 (1 self) – Add To MetaCart
  • Using Spreading Activation through Ontologies to Support Personal Information Management  
  • by Akrivi Katifori, Costas Vassilakis, Alan Dix
  • …Recent research in the domain of Personal Information Management has recognized the need for a paradigm shift towards a more activity-oriented system. Ontologies, as semantic networks with a structure not dissimilar to the one used by the human brain for storing long-term knowledge, may be very usef…
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  • Implementation Of Transaction And Concurrency Control Support In A Temporal Dbms  
  • by Costas Vassilakis, Nikos Lorentzos, Panagiotis Georgiadis — 1998 — Information Systems
  • …Transactions and concurrency control are significant features in database systems, facilitating functions both at user and system level. However, the support of these features in a temporal DBMS has not yet received adequate research attention. In this paper, we describe the techniques developed…
  • Cited by 6 (2 self) – Add To MetaCart
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