~ABLE OF COi~E~S (continued)

CKAP~RR 3  SEARCII REQUES~ FO~LA~ION~     .

           1.  ~               .

           2.  Request For~nula'tion   .

           3.  Request Optimization       .

           4.  Relevance Feed~ack      .

           5.  The Case 0£ ~0 Relevant Documents

           6.  Lx' perimental Results  .      .

               A.  Some Sample Searoli Requests
               B.  Average Results and Successive
                   Iterations
               C.  Convergence

    *  .  3-1

 *  .  .  3-1

          3-3


 *  .  .  3-5

          3-11

          3-20

          3-21

          3-21

          3-32
          3-42

CHAP~R 4   ~ QUERY-DOCU~~E~ ~TCRING ~C~IO~                        4-1

           1.  The Comparison 0£ Structured Operands              4-1

           2.  Storage Organization                               4-7

           3.  Automatic Document Classi£ication                  4-12

           4.  Classi£ication and Netric Searching                4-16

           5.  A Heuristic Classi£ication Algorithm               4-19

               A.  Basic Concepts                                 4-19
               B.  Description 0£ -~he Classi£ication
                   Algorithm                                      4-20

           6.  Ebcperimental Results                              4-36


                                 viii