Results 211 to 220 of about 1,088 (256)
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Proceedings of the 18th ACM conference on Information and knowledge management, 2009
The ability to deal with uncertain information is becoming increasingly important for modern database applications. Whereas a conventional (certain) object is usually represented by a vector from a multidimensional feature space, an uncertain object is represented by a multivariate probability density function (PDF).
Christian Böhm 0001 +4 more
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The ability to deal with uncertain information is becoming increasingly important for modern database applications. Whereas a conventional (certain) object is usually represented by a vector from a multidimensional feature space, an uncertain object is represented by a multivariate probability density function (PDF).
Christian Böhm 0001 +4 more
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Information Sciences, 2012
When issuing user-specific queries, users often present vague and imprecise information needs. Skyline queries with an intuitive query formulation mechanism identify the most interesting objects for incomplete user preferences. However, the applicability of skyline queries suffers from a severe drawback because incomplete user preferences often lead to
Jongwuk Lee +4 more
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When issuing user-specific queries, users often present vague and imprecise information needs. Skyline queries with an intuitive query formulation mechanism identify the most interesting objects for incomplete user preferences. However, the applicability of skyline queries suffers from a severe drawback because incomplete user preferences often lead to
Jongwuk Lee +4 more
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Skyline queries with constraints: Integrating skyline and traditional query operators
Data & Knowledge Engineering, 2010Multi-objective optimization has been extensively studied in the machine learning literature. And recently the database community adapted the concept as skyline queries focusing mainly on retrieving optimal values from the full-space. In this paper, we consider sub-space skyline queries in a more general database environment, such that the skyline ...
Ming Zhang, Reda Alhajj
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On Possibilistic Skyline Queries
2011This paper deals with Skyline queries in the context of possilistic databases, where uncertain attribute values are represented by possibility distributions. In this framework, Skyline queries aim at computing the extent to which any tuple from a given relation is possibly/certainly not dominated by any other tuple from that relation.
Patrick Bosc +2 more
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Skyline queries, front and back
ACM SIGMOD Record, 2013Skyline queries are a popular way to obtain preferred answers from the database by providing only the orderings of attribute values. The result of a skyline query consists of those input tuples for which there is no input tuple having better or equal values in all the attributes and a better value in at least one attribute.
Jan Chomicki +2 more
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Datenbank-Spektrum, 2016
Many applications face the problem that users are overwhelmed by the large amount of available data. In some cases an objective ranking function can be used to order data items by their relevance – similar to the top 10 results displayed by a Web search engine.
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Many applications face the problem that users are overwhelmed by the large amount of available data. In some cases an objective ranking function can be used to order data items by their relevance – similar to the top 10 results displayed by a Web search engine.
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2012
Continuous monitoring of queries over moving objects has become an important topic as it supports a wide range of useful mobile applications. A continuous skyline query involves both static and dynamic dimensions. In the dynamic dimension, the data object not only has a distance from the query object, but it also has a direction with respect to the ...
Eman El-Dawy +2 more
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Continuous monitoring of queries over moving objects has become an important topic as it supports a wide range of useful mobile applications. A continuous skyline query involves both static and dynamic dimensions. In the dynamic dimension, the data object not only has a distance from the query object, but it also has a direction with respect to the ...
Eman El-Dawy +2 more
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Skyline and reverse skyline query processing in SpatialHadoop
Data & Knowledge Engineering, 2019Abstract In this paper, we study the problem of skyline and reverse skyline computation using SpatialHadoop, an extension of Hadoop that enhances its capabilities with spatial awareness. The exploitation of spatial indexing structures and the spatial properties of data can exploit MapReduce-based methods by reducing the reading, writing ...
Christos Kalyvas, Manolis Maragoudakis
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Location-Dependent Skyline Query
The Ninth International Conference on Mobile Data Management (mdm 2008), 2008Given a set of data points with both spatial coordinates and non-spatial attributes, point a location-dependently dominates point b with respect to a query point q if a is closer to q than b and meanwhile a dominates b. A location- dependent skyline query (LDSQ) issued at point q is to retrieve all the points that are not location-dependently dominated
Baihua Zheng +2 more
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Maintenance of Range Skyline Query
2020 IEEE International Conference on Knowledge Graph (ICKG), 2020Skyline query has attracted much attention from the data management community. It is widely used in many practical applications, such as multi-criteria decision-making, product recommendations, and decision analysis. The range skyline query retrieves skyline results for each query point in the specified range, which means that users can set their ideal
Xiaoxue Li +3 more
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