Searching for authors named "Michalis Vazirgiannis" – sorted by Relevance.
35 documents found, showing 1 through 10.
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NPClu: An Approach for Clustering Non-point Objects
- …Abstract. The vast majority of clustering algorithms and approaches deal with sets of objects, where objects are points in the multidimensional Euclidean space, each occupying zero hyper volume. There is a wealth of application domains that produce data sets in which the objects occupy hyperspace. S…
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Bridging XML-Schema and relational databases. A system for generating and manipulating relational databases using valid XML documents.
- …Many organizations and enterprises establish distributed working environments, where different users need to exchange information based on a common model. XML is widely used to facilitate this information exchange. The extensibility of XML allows the creation of generic models that integrate data fr…
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A data set oriented approach for clustering algorithm selection Mafia Halkidi Michalis Vazirgiannis
- …In the last years the availability of huge transactional and experimental data sets and the arising requirements for data mining created needs for clustering algorithms that scale and can be applied in diverse domains. Thus, a variety of algorithms have been proposed which have application in dif…
- Cited by 5 (1 self) – Add To MetaCart
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Buzzrank ... and the trend is your friend
- …Ranking methods like PageRank assess the importance of Web pages based on the current state of the rapidly evolving Web graph. The dynamics of the resulting importance scores, however, have not been considered yet, although they provide the key to an understanding of the Zeitgeist on the Web. This p…
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Querying and Updating a Context-Aware Service Directory in Mobile Environments
- …Several interesting research directions materialize through the convergence of mobile computing and service-oriented computing. As mobile devices keep getting smaller, cheaper and more sophisticated, their use is becoming a commodity. We envision future scenarios that involve mobile devices acting n…
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Managing Uncertainty and Quality in the Classification Process
- …An important open issue in KDD research is the reveal and the handling of uncertainty. The popular classification approaches do not take into account this feature while they do not exploit properly the significant amount of informarion included in the results of classification process (i.e., classif…
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Web mining for web personalization
- …Web personalization is the process of customizing a Web site to the needs of specific users, taking advantage of the knowledge acquired from the analysis of the user’s navigational behavior (usage data) in correlation with other information collected in the Web context, namely, structure, content an…
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Clustering Validity Assessment: Finding the optimal partitioning of a data set
- …Clustering is a mostly unsupervised procedure and the majority of the clustering algorithms depend on certain assumptions in order to define the subgroups present in a data set. As a consequence, in most applications the resulting clustering scheme requires some sort of evaluation as regards its val…
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A spatiotemporal model and language for moving objects on road networks
- …Abstract. Moving object databases are becoming more popular due to the increasing number of application domains that deal with moving entities and need to pose queries. So far implementations of such systems have been rather weak and certainly not at industrial strength level. In this paper we defin…
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Schema-Assisted Peer Selection for XML Querying in Unstructured P2P Systems ABSTRACT
- …XML is emerging as the de-facto standard for semistructured contents and metadata. Searching this content in mobile environments is challenging, since centralized approaches are not appropriate in a very dynamic environment with limited resources available for keeping a centralized index up-to-date.…
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