1. CLEF 2008 Workshop September 17-19, 2008 Aarhus, Denmark

2. CLEF 2008 Workshop Aarhus, September 17-19, 2008 T. Mandl et al. Participation Participant Monolingual TasksBilingual TasksTOTAL DEENPTX2DEX2ENX2PT alivale*99 cheshire33366627 csusm1121117 dfki*55 hagen51015 icl99 inaoe*12 jaen*7613 pittsburgh*44 valencia66 xldb12 24 TOTAL96817 137131 2

3. CLEF 2008 Workshop Aarhus, September 17-19, 2008 T. Mandl et al. Monolingual vs Bilingual English 3 Bilingual 76% wrt Monolingual

4. CLEF 2008 Workshop Aarhus, September 17-19, 2008 T. Mandl et al. 4

5. CLEF 2008 Workshop Aarhus, September 17-19, 2008 T. Mandl et al. Monolingual vs BilingualGerman 5 Bilingual 86% wrt Monolingual

6. CLEF 2008 Workshop Aarhus, September 17-19, 2008 T. Mandl et al. 6

7. CLEF 2008 Workshop Aarhus, September 17-19, 2008 T. Mandl et al. Monolingual vs Bilingual Portuguese 7 Bilingual 90% wrt Monolingual

8. CLEF 2008 Workshop Aarhus, September 17-19, 2008 T. Mandl et al. 8

9. CLEF 2008 Workshop Aarhus, September 17-19, 2008 T. Mandl et al. Approaches  CHESHIRE (1 st all bilingual tasks, 1 st monolingual Portuguese)  OKAPI/BM25, Logistic Regression, fusion approaches  Geographic Indexing Subsystem using World Gazetteer (not used this year?)  LEC Power Translator  Hagen (1 st monolingual German)  GIRSA (GIR by semantic annotation)  Text and location names indexed separately  Results of IR and QA combined  DFKI (1 st monolingual English)  Lucene  NER Topic parsing (event part and geographic part)  Geographic ontology (using geographic taxonomies such as GeoNames, World Gazetteer)  Event ontology (using Wikipedia) 9  XLDB (2 nd monolingual Portuguese)  REMBRANDT, language-dependent named- entity recognition (uses Wikipedia)  QueryCol, query reformulation: blind relevance feedback, query expansion using geographic ontology  MG4J: text index/retrieval, implicit and explicit geographical indexes  Jaen (2 nd bilingual English)  Lemure  SINTRAM (Sinai Translation Module)  Location index (Ling Pipe for NER using GeoNames),  Query reformulation module  AliVale (2 nd monolingual English)  Jaen + Fuzzy Borda result merging  CSUMS (last in all the tasks[!])  TERRIER index/retrieval (DFR)

10. CLEF 2008 Workshop Aarhus, September 17-19, 2008 T. Mandl et al. Some other approaches  UPV  Lucene  GeoWorSE  Stanford NER system, Geo WordNet  Geo index, text index, WordNet index  ICL/KMI  Lucene  Geografic index, text index  NER Sheffield’s GATE  Pedia Crawler for geographic co-occurrence  Data fusion  Pittsburgh  Query pattern analysis (geo-part, topic-part)  Lingpipe NER  WikiGEO  INAOE  Lemure  Re-ranking using geographic expansion process  GeoNames, Lingpipe 10

11. CLEF 2008 Workshop Aarhus, September 17-19, 2008 T. Mandl et al. Conclusions 11