is a classic technique to reformulate the query, which generates diversified expansion terms to enhance the original query.
Semantic Query Expansion
. According to the existing literature, there are two types of semantic query expansion
methods: those based on semantic relation/structure and those based on large-scale corpus [30, 31].
The determination of the user's need/intent forms the basis for formulating a search plan that specifies the collection(s) to be searched, the search algorithm to use, and the query transformed in many ways: marking off phrases, disambiguating query terms, query expansion
, and more).
geometric consistency checking , query expansion
 also further significantly improve the performance of the searching system.
They built a corpus of slide-paper pairs and used four presentations from it to evaluate four aligners which utilize methods such as TF-IDF term weighting and query expansion
. The query expansion
does not improve performance in our application and that TF-IDF term weighting is inferior to a much simpler scoring mechanism based on the number of matched terms.TF-IDF term weighting is inferior to a simpler scoring mechanism based only on the number of matched terms and query expansion
degrades aligner performance.
SSDCN approach is compared with keyword based search, WordNet-based lexical query expansion
and ontology-based semantic query expansion
In query expansion
, related words are added to user's original query and form a longer and more precise query to express users' retrieval intentions.
Using query expansion
(QE) techniques, a query is reformulated to improve retrieval performance and obtain additional relevant documents by expanding the original query with additional relevant terms and reweighting the terms in the expanded query.
The specific topics include query expansion
based on Mongolian semantics, subspace culling for continuous collision detection, designing and implementing a static test approach for embedded software, an area-based image matching algorithm and its implementation, and the real-time estimation of the road friction coefficient for an electric vehicle.