IRS13 Test Environment chapter E. M. Keen Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. 1-20 Concepts in Associations Proved Request Document by Concon Cylinder + Friction Cylinder Cylinder Cylinder + Length Known Friction Known + Kernel Along Length Along + Blade Etc. Unit Function Unit + Cylinder Velocity Function + Kernel Etc. Velocity + Blade (a) Section from con- con pair associ- ation list Request Expanded with Concon (b) Selection of con- cepts in request and document with- out concon Document Expanded with Concon (Cylinder) + Friction [OCRerr] Friction (Cylinder) + Length [OCRerr] Cylinder (Known) + Kernel (Along) + Blade Known Along Etc. Recall device effect Length Cylinder T {[OCRerr]ylinder (Unit) i Kernel + (Function) i Blade + (Velocity) 1 Unit I Function I Velocity I Etc. First order [OCRerr]matches (type A:c) }First order match (type Bt) Second order )`natches [OCRerr]precision device effect (c) Selection of the request and document concepts using concon, with five matches of three types generated Illustration of Recall and Precision Device Effect of Concon Fig. 7