Anchor text has been proofed efficient in former TREC experiments on homepage finding task[1]
\nand somewhat useful to ad hoc retrieval by result combination[2]. In this year, our conclusion was
\nconsistent with formers. Besides, the use of the URL and links inside the webpage were also
\nobserved. Again, results on training set are encouraging.
\nWe made an assumption that a key resource is more likely to link to multiple relevant documents.
\nThen the out-degree of the page and the similarities of the documents the page point to were used
\nas the two factors for key resource selection. Experimental results were quite good, showing their
\nability of finding key resource on one server.
\nTwo site uniting (SU) approaches have been studied to select proper pages as the representation of
\none server. (1) The document which has index characteristic and has a high enough similarity is
\nreserved as key resource. (2) Documents of the same server in result list are given different
\nreliability factor which is decaying by decreases of similarities. Both are useful for given
\nexamples (using as training set) in this year’s Web track, especially the latter one. Better results
\nwere got by combing SU approach and out-degree factor mentioned above to find key resource.
\nAll the experiments we performed were run on Okapi system. There are quite a few parameters to
\ntune, which affect the performance greatly. Therefore, we also proposed and implemented a
\ngenetic algorithm based dynamic parameter learning approach to all the tasks.<\/p>\n","protected":false},"excerpt":{"rendered":"
Anchor text has been proofed efficient in former TREC experiments on homepage finding task[1] and somewhat useful to ad hoc retrieval by result combination[2]. In this year, our conclusion was consistent with formers. Besides, the use of the URL and links inside the webpage were also observed. Again, results on training set are encouraging. 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