1	WordNet Week 3 KAN Min-Yen (Self-study module)
2	Thesauri and Lexical Relations Polysemy: Same word, different senses of meaning We say that homographs are polysemous Slightly different concepts expressed similarly Synonyms: Different words, related senses of meanings Different ways to express similar concepts
3	WordNet Can be downloaded for free: www.cogsci.princeton.edu/~wn/ Or try the online lookup at: www.cogsci.princeton.edu/cgi-bin/webwn We only cover up to version 1.7 here Emphasizes the (hierarchical) organization rather than its coverage Organizes hierarchy around a synset i.e., synonym set -- a group of tokens that can express the same core concept e.g., (synset #07754049) spring, fountain, outflow, outpouring, natural spring
4	Hypernyms from WordNet spring, fountain, outflow, outpouring, natural spring => geological formation, geology, formation => natural object => object, physical object => entity, physical thing mountain, mount => natural elevation, elevation => geological formation, geology, formation => natural object => object, physical object => entity, physical thing
5	Structure of WordNet
6	Structure of WordNet
7	Structure of WordNet
8	To think about: Most IR research has primarily looked at statistical approaches to find “aboutness” How has (or might) WordNet be used to provide more functionality in searching?