Search Results - "Tsotras, Vassilis"

SGPAC: generalized scalable spatial GroupBy aggregations over complex polygons by Abdelhafeez, Laila, Magdy, Amr, Tsotras, Vassilis J.

“…This paper studies the spatial group-by query over complex polygons. Given a set of spatial points and a set of polygons, the spatial group-by query returns…”
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A new window Clause for SQL by Fang, James, Lychagin, Dmitry, Carey, Michael J., Tsotras, Vassilis J.

“…Window queries are important analytical tools for ordered data and have been researched both in streaming and stored data environments. By incorporating ideas…”
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Reverse spatial top-k keyword queries by Ahmed, Pritom, Eldawy, Ahmed, Hristidis, Vagelis, Tsotras, Vassilis J.

“…We introduce the R everse S patial Top-k K eyword (RSK) query, which is defined as: given a query term q, an integer k and a neighborhood size find all the…”
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DDCEL: Efficient Distributed Doubly Connected Edge List for Large Spatial Networks by Abdelhafeez, Laila, Magdy, Amr, Tsotras, Vassilis J.

“…The Doubly Connected Edge List (DCEL) is a popular data structure for representing planar subdivisions and is used to accelerate spatial applications like map…”
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Subscribing to big data at scale by Wang, Xikui, Carey, Michael J., Tsotras, Vassilis J.

“…Today, data is being actively generated by a variety of devices, services, and applications. Such data is important not only for the information that it…”
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Comparison and evaluation of state-of-the-art LSM merge policies by Mao, Qizhong, Jacobs, Steven, Amjad, Waleed, Hristidis, Vagelis, Tsotras, Vassilis J., Young, Neal E.

“…Modern NoSQL database systems use log-structured merge (LSM) storage architectures to support high write throughput. LSM architectures aggregate writes in a…”
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Efficient local locking for massively multithreaded in-memory hash-based operators by Romanous, Bashar, Windh, Skyler, Absalyamov, Ildar, Budhkar, Prerna, Halstead, Robert, Najjar, Walid, Tsotras, Vassilis

“…The join and group-by aggregation are two memory intensive operators that are affecting the performance of relational databases. Hashing is a common approach…”
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Being Happy with the Least: Achieving α-happiness with Minimum Number of Tuples by Xie, Min, Wong, Raymond Chi-Wing, Peng, Peng, Tsotras, Vassilis J.

“…When faced with a database containing millions of products, a user may be only interested in a (typically much) smaller representative subset. Various…”
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Reachability Queries with Transfer Decay by Strzheletska, Elena V., Tsotras, Vassilis J.

“…A spatiotemporal reachability query identifies whether a physical item (or information, virus etc.) could have been transferred from the source moving object O…”
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ASTERIX: towards a scalable, semistructured data platform for evolving-world models by Behm, Alexander, Borkar, Vinayak R., Carey, Michael J., Grover, Raman, Li, Chen, Onose, Nicola, Vernica, Rares, Deutsch, Alin, Papakonstantinou, Yannis, Tsotras, Vassilis J.

“…ASTERIX is a new data-intensive storage and computing platform project spanning UC Irvine, UC Riverside, and UC San Diego. In this paper we provide an overview…”
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High performance FPGA and GPU complex pattern matching over spatio-temporal streams by Moussalli, Roger, Absalyamov, Ildar, Vieira, Marcos R., Najjar, Walid, Tsotras, Vassilis J.

“…The wide and increasing availability of collected data in the form of trajectories has led to research advances in behavioral aspects of the monitored subjects…”
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Selectivity estimators for multidimensional range queries over real attributes by GUNOPULOS, Dimitrios, KOLLIOS, George, TSOTRAS, Vassilis J, DOMENICONI, Carlotta

“…Estimating the selectivity of multidimensional range queries over real valued attributes has significant applications in data exploration and database query…”
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Indexing spatiotemporal archives by HADJIELEFTHERIOU, Marios, KOLLIOS, George, TSOTRAS, Vassilis J, GUNOPULOS, Dimitrios

“…Spatiotemporal objects - that is, objects that evolve over time - appear in many applications. Due to the nature of such applications, storing the evolution of…”
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Editing and versioning for high performance network models in a multiuser environment by Bakalov, Petko, Hoel, Erik, Heng, Wee-Liang, Menon, Sudhakar, Tsotras, Vassilis J.

“…Network data models are frequently used as a mechanism to describe the connectivity between spatial features in GIS applications. Real-life network models are…”
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SaIL : A spatial index library for efficient application integration by HADJIELEFTHERIOU, Marios, HOEL, Erik, TSOTRAS, Vassilis J

“…With the proliferation of spatial and spatio-temporal data that are produced everyday by a wide range of applications, Geographic Information Systems (GIS)…”
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Finding the K highest-ranked answers in a distributed network by Zeinalipour-Yazti, Demetrios, Vagena, Zografoula, Kalogeraki, Vana, Gunopulos, Dimitrios, Tsotras, Vassilis J., Vlachos, Michail, Koudas, Nick, Srivastava, Divesh

“…In this paper, we present an algorithm for finding the k highest-ranked (or Top- k) answers in a distributed network. A Top- K query returns the subset of most…”
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Indexing mobile objects using dual transformations by KOLLIOS, George, PAPADOPOULOS, Dimitris, GUNOPULOS, Dimitrios, TSOTRAS, Vassilis J

“…With the recent advances in wireless networks, embedded systems, and GPS technology, databases that manage the location of moving objects have received…”
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Querying Spatio-temporal Patterns in Mobile Phone-Call Databases by Vieira, Marcos R, Frías-Martínez, Enrique, Bakalov, Petko, Frías-Martínez, Vanessa, Tsotras, Vassilis J

“…Call Detail Record (CDR) databases contain many millions of records with information about mobile phone calls, including the users' location when the call was…”
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Efficient temporal join processing using indices by Donghui Zhang, Tsotras, V.J., Seeger, B.

“…We examine the problem of processing temporal joins in the presence of indexing schemes. Previous work on temporal joins has concentrated on non-indexed…”
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Bridging BAD Islands: Declarative Data Sharing at Scale by Wang, Xikui, Carey, Michael J., Tsotras, Vassilis J.

“…In many Big Data applications today, information needs to be actively shared between systems managed by different organizations. To enable sharing Big Data at…”
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