SP500207 Vector Expansion in a Large Collection chapter E. Voorhees Y-W. Hou National Institute of Standards and Technology Donna K. Harman Computer-aided Crime Detection Document must describe a computer application to crime solving. To be relevant, a document must describe either an actual or a theoretical computer application to detective work, by the police or by another law enforcement orga- nization. A relevant document could include techniques such as profiling criminals and their methods of operation, identifying finger prints, spotting anomalies, etc. 1. police, detective, sleuth, enforcement agency 2. clue, records, fingerprints, methods Figure 2: Text of Topic 95 Surrogate Motherhood Document will report judicial proceedings and opinions on contracts for surrogate motherhood. A relevant document will report legal opinions, judgments, and decisions regarding surrogate motherhood and the custody of any children which result from surrogate motherhood. To be relevant, a document must identify the case, state the issues which are being decided and report at least one ethical or legal question which arises from the case. 1. surrogate, mothers, motherhood 2. judge, lawyer, court, lawsuit, custody, hearing, opinion, finding Figure 3: Text of Topic 70 Query Expanded Weight .20626 .18793 .16088 .40100 .10375 .08165 .08233 .13792 .25840 .16667 .08366 Vectors for Topic 95 Unexpanded Weight .25682 .23399 .11148 .27738 .08331 Concept enforc fingerprint print sleuth law felon crook constabl espial catch outlaw Query Expanded Weight .15901 .11605 .50365 .14090 .56104 .24603 .14946 .10880 .18264 .10257 Vectors for Topic 70 Unexpanded Weight .08546 .06181 .48892 .08597 .69887 .12226 .20529 Concept decid proceed mother case surrog judg custod matern judicial_decid legal[OCRerr]act Figure 4: Query Vectors for Sample Topics 349