Abstract
Linked data is a promising way to publish media data as resources on the Web and interlink them with other resources. While significant amounts of image, audio and video fragments have been tagged and exposed as linked data, searching and explaining the unexpected query results have been rarely studied. To improve the functionality and usability of SPARQL-based multimedia search engines, we focus on explaining missing items in the query results, or the so-called why-not question in this paper. We first formalize why-not questions on multimedia SPARQL queries and then propose a novel explanation model to answer why-not questions. Our model adopts a to generate logical explanations at the basic graph pattern level, the filter constraint level, or the multimedia function level, respectively, which helps users refine their initial queries. Extensive experimental results on two real-world RDF datasets show that the proposed model and algorithms can provide high-quality explanations both in terms of effectiveness and efficiency.
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Notes
Mona Lisa was painted in 1503. Mary, mother of Jesus was indeed painted by Leonardo da Vinci, but its was only a part of the Virgin of the Rocks.
https://github.com/tkurz/sparql-mm/tree/master/ns/2.0.0/ontology, a class model to describe spatio-temporal multimedia fragments and support ontology agnostic functions.
Planet Earth II is a 2016 multinational nature documentary series produced by the BBC.
http://wiki.dbpedia.org/Datasets, released in Sep., 2014
The Cronbach’s alpha is a standard measure of internal con-sistency reliability. A Cronbach’s alpha of 0.7 and higher may be regarded as satisfactory.
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Acknowledgments
This work is sponsored by The Fundamental Theory and Applications of Big Data with Knowledge Engineering under the National Key Research and Development Program of China with grant number 2016YFB1000903; National Science Foundation of China under Grant Nos.61672419, 61532004, and 61532015; MOE Research Center for Online Education Funds under Grant No.2016YB165; Ministry of Education Innovation Research Team No.IRT17R86.
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Wang, M., Chen, W., Wang, S. et al. Answering why-not questions on semantic multimedia queries. Multimed Tools Appl 77, 3405–3429 (2018). https://doi.org/10.1007/s11042-017-5151-6
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DOI: https://doi.org/10.1007/s11042-017-5151-6