System Summary and Timing
  Organization Name: Apple Computer, Inc.
  List of Run ID's: vtwnA1, vtwnB1

  Construction of Indices, Knowledge Bases, and other Data Structures

    Methods Used to build Data Structures

    - Length (in words) of the stopword list: 571 
    - Controlled Vocabulary?: no 
    - Stemming Algorithm: Proprietary rule-based stemmer.            
    - Term Weighting:  Yes
    -  Phrase Discovery?:            
    -  Tokenizer?: Yes            

    Statistics on Data Structures built from TREC Text

    - Inverted index           
      - Run ID: vtwnA1 
      - Total Storage (in MB): 462 
      - Total Computer Time to Build (in hours): 28.67 
      - Automatic Process? (If not, number of manual hours): yes 
      - Only Single Terms Used?: yes 
    - Inverted index           
      - Run ID: vtwnB1 
      - Total Storage (in MB): 462 
      - Total Computer Time to Build (in hours): 28.67 
      - Automatic Process? (If not, number of manual hours): yes 
      - Only Single Terms Used?: yes 
    - Clusters           
    - N-grams, Suffix arrays, Signature Files           
    - Knowledge Bases           
      - Use of Manual Labor                
    - Special Routing Structures           
    - Other Data Structures built from TREC text           

  Searching

    Search Times

      - Run ID: vtwnA1 
      - Computer Time to Search (Average per Query, in CPU seconds): 20 (clock
time)
    -  Search Times            
      - Run ID: vtwnB1 
      - Computer Time to Search (Average per Query, in CPU seconds): 46 (clock
time)
      - Component Times:  Relevance feedback took slightly more than half the 
time.

    Machine Searching Methods

      - Vector Space Model?: Yes. 
      - Other: Yes, relevance feedback used for run vtwinB1.

    Factors in Ranking

      - Term Frequency?: yes 
      - Inverse Document Frequency?: yes 
      - Document Length?: yes 

      - Other: Technique for adjusting scores of short queries; probably had 
little or no effect, given the length of the ad hoc topics.

    Machine Information

    - Machine Type for TREC Experiment: Power Macintosh 7200 (used for initial
testing)  Power Macintosh 9500 (used for timing runs)
    - Was the Machine Dedicated or Shared: Dedicated 
    - Amount of Hard Disk Storage (in MB): 4000 
    - Amount of RAM (in MB): 16 on testing machine; 13 MB allocated to 
indexing process; 48 on timing machine; 34 MB allocated to indexing process
    - Clock Rate of CPU (in MHz): 90 MHz PowerPC; 601 (testing machine); 
32 MHz PowerPC 604 (timing machine)

    System Comparisons

    - Given appropriate resources           
      - Could your system run faster?:  Yes