Titlebook: Knowledge Engineering and Semantic Web; 8th International Co Przemysław Różewski,Christoph Lange Conference proceedings 2017 Springer Inter

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More on the Data Complexity of Answering Ontology-Mediated Queries with a Covering AxiomWe report on our recent results in the ongoing attempts to classify conjunctive queries (CQs) . according to the data complexity of answering ontology-mediated queries of the form .. In particular, we present new families of path CQs for which this problem is .-, .- or .-complete.

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Przemysław Różewski,Christoph LangeIncludes supplementary material:

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Reducing the Degradation of Sentiment Analysis for Text Collections Spread over a Period of Time constantly updated by users there is essential to take into account new jargons, vital discussed topics while solving classification task. Therefore two fundamentally different methods for solution this problem are suggested. Supervised machine learning method and unsupervised machine learning meth

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Searching for the Most Negative Opinionsof their polarity (positive, negative or neutral), the entities or facets involved, and so on. However, to the best of our knowledge, no sentiment analysis approach has considered the automatic identification and extraction of the most negative opinions, in spite of their significant impact in many

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