3. In what sea did the submarine sink? Barents Sea
of extended WordNet and knowledge base, the
text terms are converted to logical forms that can
Some Related Passages be proved to match the question logical forms.
Russian officials have speculated that the Kursk col-The IBM’s PIQUANT system (Chu-Carroll et al,
lided with another vessel in the Barents Sea, and usu-2003; Prager et al, 2004) adopts a QA-by-
ally blame an unspecified foreign submarine. All 118 Dossier-with-Constraints approach, which util-
officers and sailors aboard were killed. izes the natural constraints between the answer to
the main question and the answers to the auxil-
The Russian governmental commission on the acci-iary questions. Syntactic dependency matching
dent of the submarine Kursk sinking in the Barents has also been applied in many QA systems (Cui
Sea on August 12 has rejected 11 original explana-et al, 2005; Katz and Lin 2003). The syntactic
tions for the disaster. dependency relations of a candidate sentence are
.... as the same one carried aboard the nuclear subma-matched against the syntactic dependency rela-
rine Kursk, which sank in the Barents Sea on Aug. 12, tions in the question in order to decide if the can-
killing all 118 crewmen aboard. didate sentence contains the answer. Although
surface text pattern matching is a comparatively
The navy said Saturday that most of the 118-man simple method, it is very efficient for simple fac-
crew died Aug. 12 when a huge explosion .... toid questions and is used by many QA systems
(Hovy et al 2001; Soubbotin, M. and S. Soub-
Chief of Staff of the Russian Northern Fleet Mikhail botin 2003). As a powerful web search engine
Motsak Monday officially confirmed the deaths of and external online knowledge resource, Google
118 crewmen on board the Kursk nuclear submarine that went to the bottom of the Barents Sea on August has been widely adopted in QA systems (Hovy et
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