Combining Named Entities with WordNet and Using Query-Oriented Spreading Activation for Semantic Text Search

Abstract

Purely keyword-based text search is not satisfactory because named entities and WordNet words are also important elements to define the content of a document or a query in which they occur. Named entities have ontological features, namely, their aliases, classes, and identifiers. Words in WordNet also have ontological features, namely, their synonyms, hypernyms, hyponyms, and senses. Those features of concepts may be hidden from their textual appearance. Besides, there are related concepts that do not appear in a query, but can bring out the meaning of the query if they are added. We propose an ontology-based generalized Vector Space Model to semantic text search. It exploits ontological features of named entities and WordNet words, and develops a query-oriented spreading activation algorithm to expand queries. In addition, it combines and utilizes advantages of different ontologies for semantic annotation and searching. Experiments on a benchmark dataset show that, in terms of the MAP measure, our model is 42.5% better than the purely keyword-based model, and 32.3% and 15.9% respectively better than the ones using only WordNet or named entities.

Graph-Based Optimisation of Network Expansion in a Dockless Bike Sharing System

“…One of the primary objectives of this endeavor is to identify the optimal number of stations in suitable locations, a task that necessitates spatial analysis employing appropriate tools and methods. Graph networks have been widely utilized in various applications, including textile structure [5], [6], ontology [7], [8], [9], knowledgebased systems [10], [11] and electronic health records [12]. In the context of bike-sharing systems, graph-based approaches have been employed to model locations, trips, and associated time intervals, facilitating the investigation of system dynamics.…”