5. 2.2 A Taxonomy of IR Models Set Theoretic Fuzzy Extended Boolean Algebraic Generalized Vector Lat. Semantic Index Neural Networks Probabilistic Inference Network Belief Network U s e r T a s k Retrieval: Ad hoc Filtering Browsing Classic Models boolean vector probabilistic Structured Models Non-Overlapping Lists Proximal Nodes Browsing Flat Structure Guided Hypertext
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14. Boolean Model (Cont.) 병렬 프로그램 시스템 1 1 0 … 0 1 1 … 0 0 1 … 1 0 1 … 병렬 프로그램 시스템 … 색인어 1 0 0 1 유사도 004 003 002 001 문서
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21. Vector model (Cont.) Hence, the ranking would be D 2 , D 3 , D 1 Document vectors Not normalized .176 0 .477 0 0 .176 0 0 0 0 0 Q .176 .176 0 0 0 .176 0 0 0 .176 0 D 3 .176 0 .954 0 0 0 0 .477 0 .176 0 D 2 0 .176 0 0 0 .176 .477 0 .477 0 0 D 1 t 11 t 10 t 9 t 8 t 7 t 6 t 5 t 4 t 3 t 2 t 1
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