Báo cáo khoa học: "PCFGs, Topic Models, Adaptor Grammars and Learning Topical Collocations and the Structure of Proper Names" ppt

... for Computational Linguistics PCFGs, Topic Models, Adaptor Grammars and Learning Topical Collocations and the Structure of Proper Names Mark Johnson Department of Computing Macquarie University mjohnson@science.mq.edu.au Abstract This ... labelled X and whose ith child is a member of T B i . 1149 The set of trees generated by the CFG is T S , where S is...

Ngày tải lên: 23/03/2014, 16:20

... Proceedings of the 47th Annual Meeting of the ACL and the 4th IJCNLP of the AFNLP, pages 459–467, Suntec, Singapore, 2-7 August 2009. c 2009 ACL and AFNLP Employing Topic Models for Pattern-based ... Determine the number of topics: Most topic models require the number of topics to be known beforehand 1 . However, it is not an easy task to automatically deter...

Ngày tải lên: 08/03/2014, 00:20

... (1) The parameters of these models are the distortion probabilities d(a j | a j−1 , j) and the translation prob- abilities t( f j | e a j ). The three models differ in their estimation of d, but the ... concern us here. All three models, as well as IBM Models 3–5, share the same t. For further details of these models, the reader is referred to the original papers de...

Ngày tải lên: 30/03/2014, 17:20

... – 32BACKOFF, 43BACKOFF, 45BACKOFF, and POSITION – and four corre- sponding parameters to be estimated. Combined graph Finally, we consider the union of the character n- gram graph and the FirstName-LastName ... the previous case, a typed edge (32BACK- OFF) is added between the trigram aba and the bi- gram ab representing the backoff relation. In the absence of thes...

Ngày tải lên: 30/03/2014, 21:20

... analysis, and the determination of released ammonia. The coupled enzyme assay revealed the mechanism of the deamination reaction and the subsequent metabolism, including the deamination step. The product ... time. The peak at 268 nm was assigned to 2,5-pyridinedicarboxylic acid based on the wavelength [10]. Purification and properties of the purified enzyme The...

Ngày tải lên: 19/02/2014, 16:20

... ⁄ 480 nm. The GSH content of the plasma was derived from the standard curve and the regression equation. The average recovery test was made using the standard addition method, and the RSD was ... reagent blanks, and S is the slope of the standard curve. The relative standard deviation was 2.5%, obtained from a series of 11 standards each containing 2.00 lm GSH....

Ngày tải lên: 07/03/2014, 05:20

... of a derivation tree is a finite set F of pairs of at- tribute names and their values. F is called the f- structure of v. An lfg G consists of a cfg Go called the underlying cfg of G and ... dc-lfg G, for each pair (tl, t2) of derivation trees in G, if the f -structure and nonterminal of the root of tl are the same as those of t2, then t] and t2 d...

Ngày tải lên: 08/03/2014, 07:20

... necessary, the solution contacting the electrodes was ventilated by means of a stream of air from an electric fan. The effect of the substrate methane on the electrochemical properties of the MMOH/MMOB/catalase ... investigate the effects of catalase, MMOB and MMOB tru and the substrate acetonitrile on electron transfer to MMOH was also performed between 0 and...

Ngày tải lên: 17/03/2014, 09:20

... (Milan Theater) and is not at the beginning of that constituent. Finally, the syntactic depen- dence trace of a word is the path of IOB values from the root of the tree to the word itself. The last ... po- sitions the primary focus on the quality of para- phrases and/ or translations, we are more interested in the relation between the use of syntactic fea-...

Ngày tải lên: 31/03/2014, 01:20

... mediates Na + and Li + ion extrusion from the cell. We therefore investigated whether the loss of halotolerance in isc1D cells was due to the failure of ENA1 induction in the mutant. For this, the ENA1-lacZ promoter–reporter ... induction of the ENA1/PMR2 gene (designated as ENA1 in the following) encoding an enzyme of the P-type ATPase family. This cation-extrusion...

Ngày tải lên: 31/03/2014, 09:20