Tài liệu Báo cáo khoa học: "N Semantic Classes are Harder than Two" doc

... pages 49–56, Sydney, July 2006. c 2006 Association for Computational Linguistics N Semantic Classes are Harder than Two Ben Carterette ∗ CIIR University of Massachusetts Amherst, MA 01003 carteret@cs.umass.edu Rosie ... which features are most significant for identifying which semantic classes. 5.1 Features Features for query substitution pairs are extracted from query logs...

Ngày tải lên: 20/02/2014, 12:20

... Switzerland Gene-encoded inhibitors of aspartic proteinases are rather rare in nature. Thus, there is a need to under- stand the mechanisms of action of the few that are known, in order to exploit their therapeutic ... among these enzymes are a number with sequences that are very closely related to that of sac- charopepsin (e.g. the vacuolar aspartic proteinase from P. pastoris; PpPr)...

Ngày tải lên: 19/02/2014, 00:20

... parameters were calculated using nonlinear least-squares regression with kaleida graph software (Adelbeck Software, Reading, PA, USA) or IGOR Pro software (WaveMetrics, Inc., Lake Oswego, OR, USA). Eqn ... more than 300 times higher than with NADH (0.13 UÆmg )1 )in reductive amination of pyruvate. Oxidative deamina- tion of N-methyl-l-alanine with NADP + (0.36 UÆ mg )1 ) was markedly lowe...

Ngày tải lên: 19/02/2014, 16:20

... in P2 that are more informa- tive than portions in P1 (backward entailment), and should be translated to replace or complement them; (4) Text portions in P1 describing facts that are not present ... a larger improvement when they are used in com- bination. 5 Conclusion We addressed the identification of semantic equiv- alence and information disparity in two documents about the same...

Ngày tải lên: 19/02/2014, 19:20

... Role (SR) The roles that are not PRs are called secondary roles (SRs). Given N roles in total, there are (N − K) SRs, denoted by S 1 , S 2 , , S N−K . Unlike PRs, SRs are not constrained to occur ... syntactic and semantic features could provide clues to the semantic role label of a constituent, non- local features such as predicate voice could provide information about the expect...

Ngày tải lên: 19/02/2014, 19:20

... verb relations. These relations, such as (x, EXPAND, y) are first automatically learnt from a corpus. The semantic classes of x and y are then inferred using concep- tual density (Agirre and ... and y in the corpus. Semantic classes represent possible common generalizations of the verb ar- guments. At the end of the process, a set of syn- tactic -semantic patterns are avail...

Ngày tải lên: 20/02/2014, 12:20

... list of words with semantic orienta- tion: positive or negative (desirable or undesirable). Frequent appearance of positive words in a docu- ment implies that the writer of the document would have ... iteratively determines the semantic orientations of the words neighboring any of the seed words and enlarges the seed word set in a bootstrapping manner. Subjective words are often semanti...

Ngày tải lên: 20/02/2014, 15:20

... RNA molecule are able to sense environmental conditions within the cell and sub- sequently to adopt a certain structure that, in turn, leads to a functional response [3]. Riboswitches are structural ... decay of the RNA molecule [15,16], are major determinants of the folding kinetics. Further factors that affect the speed and reac- tion route of RNA folding are ligands that interact w...

Ngày tải lên: 14/02/2014, 19:20

... OmpA, which was also prepared with urea but without 2-ME. They suggest that one or more segments of the C-terminal domain are attempting to insert into the bilayer but are unable to become part ... signal of OmpA are modified by cOHBs [37]. The importance of these modifications was illustrated in subsequent studies showing that OmpA mutants lacking cOHBs on Ser163 and Ser167 are incapab...

Ngày tải lên: 18/02/2014, 04:20

... partner. Although most nuclear receptors are activated only when their specific ligands are present, HNF-4 and LRH-1 appear to be exceptional, in that they are con- stitutively active in the abundance ... proteins that are postulated to interact with sterols: HMG-CoA reductase, the Niemann–Pick C1 protein, and Patched [3]. The C-terminal domain of SCAP contains five WD repeats, which a...

Ngày tải lên: 18/02/2014, 13:20