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Searching for authors named "Panagiotis Karras" – sorted by Relevance.

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Help! 7 documents found, showing 1 through 7.
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  • Detecting the direction of motion in a binary sensor network  
  • by Panagiotis Karras — 2006 — in Proceedings of the IEEE International Conference on Sensor Networks, Ubiquitous, and Trustworthy Computing (SUTC
  • …We examine the problem of detecting the direction of motion in a binary sensor network; in such a network each sensor’s value is supplied reliably in a single bit of information: whether the moving object is approaching towards or moving away from the sensor. We demonstrate that the geometric proper…
  • Cited by 1 (0 self) – Add To MetaCart
  • Exploiting duality in summarization with deterministic guarantees  
  • by Panagiotis Karras, Dimitris Sacharidis — 2007 — in KDD
  • …Summarization is an important task in data mining. A major challenge over the past years has been the efficient construction of fixed-space synopses that provide a deterministic quality guarantee, often expressed in terms of a maximum-error metric. Histograms and several hierarchical techniques have…
  • Cited by 1 (1 self) – Add To MetaCart
  • One-Pass Wavelet Synopses for Maximum-Error Metrics  
  • by Panagiotis Karras, Nikos Mamoulis — 2005
  • …We study the problem of computing waveletbased synopses for massive data sets in static and streaming environments. A compact representation of a data set is obtained after a thresholding process is applied on the coefficients of its wavelet decomposition. Existing polynomial-time thresholding schem…
  • Cited by 12 (3 self) – Add To MetaCart
  • Hexastore: Sextuple Indexing for Semantic Web Data Management  
  • by Cathrin Weiss, Panagiotis Karras, Abraham Bernstein — 2008
  • …Despite the intense interest towards realizing the Semantic Web vision, most existing RDF data management schemes are constrained in terms of efficiency and scalability. Still, the growing popularity of the RDF format arguably calls for an effort to offset these drawbacks. Viewed from a relationalda…
  • Cited by 2 (0 self) – Add To MetaCart
  • Fast Data Anonymization with Low Information Loss  
  • by Gabriel Ghinita, Panagiotis Karras, Panos Kalnis, Nikos Mamoulis — 2007 — in VLDB, 2007
  • …Recent research studied the problem of publishing microdata without revealing sensitive information, leading to the privacy preserving paradigms of k-anonymity and ℓ-diversity. k-anonymity protects against the identification of an individual’s record. ℓ-diversity, in addition, safeguards against the…
  • Cited by 10 (3 self) – Add To MetaCart
  • Common Influence Join: A Natural Join Operation for Spatial Pointsets  
  • by Man Lung Yiu, Nikos Mamoulis, Panagiotis Karras
  • …Abstract — We identify and formalize a novel join operator for two spatial pointsets P and Q. The common influence join (CIJ) returns the pairs of points (p, q), p ∈ P, q ∈ Q, such that there exists a location in space, being closer to p than to any other point in P and at the same time closer to q …
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