Text REtrieval Conference (TREC)
System Description

Organization Name: University of North Carolina Run ID: unc6ip
Section 1.0 System Summary and Timing
Section 1.1 System Information
Hardware Model Used for TREC Experiment: Sun Ultra II
System Use: SHARED
Total Amount of Hard Disk Storage: 28 Gb
Total Amount of RAM: 768 MB
Clock Rate of CPU: 200 MHz
Section 1.2 System Comparisons
Amount of developmental "Software Engineering": ALL
List of features that are not present in the system, but would have been beneficial to have: contextual thesaurus
List of features that are present in the system, and impacted its performance, but are not detailed within this form:
Section 2.0 Construction of Indices, Knowledge Bases, and Other Data Structures
Length of the stopword list: 390 words
Type of Stemming: MORPHOLOGICAL
Controlled Vocabulary: NO
Term weighting: YES
  • Additional Comments on term weighting: SMART Lnu(documents); SMART ltc(query)
Phrase discovery: YES
  • Kind of phrase: 2-word collocations
  • Method used: STATISTICAL
Type of Spelling Correction: NONE
Manually-Indexed Terms: NO
Proper Noun Identification: NO
Syntactic Parsing: NO
Tokenizer: NO
Word Sense Disambiguation: NO
Other technique: NO
Additional comments:
Section 3.0 Statistics on Data Structures Built from TREC Text
Section 3.1 First Data Structure
Structure Type: INVERTED INDEX
Type of other data structure used:
Brief description of method using other data structure:
Total storage used: 2.4 Gb
Total computer time to build: 100 hours
Automatic process: YES
Manual hours required: hours
Type of manual labor: NONE
Term positions used: NO
Only single terms used: NO
Concepts (vs. single terms) represented: NO
  • Number of concepts represented:
Type of representation:
Auxilary files used: NO
  • Type of auxilary files used:
Additional comments:
Section 3.2 Second Data Structure
Structure Type:
Type of other data structure used:
Brief description of method using other data structure:
Total storage used: Gb
Total computer time to build: hours
Automatic process:
Manual hours required: hours
Type of manual labor:
Term positions used:
Only single terms used:
Concepts (vs. single terms) represented:
  • Number of concepts represented:
Type of representation:
Auxilary files used:
  • Type of auxilary files used:
Additional comments:
Section 3.3 Third Data Structure
Structure Type:
Type of other data structure used:
Brief description of method using other data structure:
Total storage used: Gb
Total computer time to build: hours
Automatic process:
Manual hours required: hours
Type of manual labor:
Term positions used:
Only single terms used:
Concepts (vs. single terms) represented:
  • Number of concepts represented:
Type of representation:
Auxilary files used:
  • Type of auxilary files used:
Additional comments:
Section 4.0 Data Built from Sources Other than the Input Text
Internally-built Auxiliary File

File type:
Domain type:
Total Storage: Gb
Number of Concepts Represented: concepts
Type of representation:
Automatic or Manual:
  • Total Time to Build: hours
  • Total Time to Modify (if already built): hours
Type of Manual Labor used:
Additional comments:
Externally-built Auxiliary File

File is:
Total Storage: Gb
Number of Concepts Represented: concepts
Type of representation:
Additional comments:
Section 5.0 Computer Searching
Average computer time to search (per query): CPU seconds
Times broken down by component(s):
Section 5.1 Searching Methods
Vector space model:
Probabilistic model:
Cluster searching:
N-gram matching:
Boolean matching:
Fuzzy logic:
Free text scanning:
Neural networks:
Conceptual graphic matching:
Other:
Additional comments:
Section 5.2 Factors in Ranking
Term frequency:
Inverse document frequency:
Other term weights:
Semantic closeness:
Position in document:
Syntactic clues:
Proximity of terms:
Information theoretic weights:
Document length:
Percentage of query terms which match:
N-gram frequency:
Word specificity:
Word sense frequency:
Cluster distance:
Other:
Additional comments:
Send questions to trec@nist.gov

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