Domain-Specific Cross Language Retrieval: Comparing and Merging Structured and Unstructured Indices

This year, we participated in all Monolingual, Bilingual and Multilingual tasks of the DomainSpecific track. We used a redesigned version of our retrieval system prototype from 2006, which is based on the Lucene API [1]. A plugin to access the online translation services Google Translate [2] and PROMT [3] was implemented for the cross-language experiments. Furthermore, we tried to figure out the differences between plain and structured indices and also applied a data fusion approach for both index schemes. In comparison to the median of all participants of the Monolingual tasks we achieved average performance for our german and english and strong performance for our russian runs. The results of the cross-language tasks were robust compared to our own monolingual experiments and better than the average of the results submitted by all participants.