Tài liệu Báo cáo khoa học: "Prefix Probabilities from Stochastic Tree Adjoining Grammars*" pptx

... set of initial trees and .A is a set of auxiliary trees. Trees in :TU.A are also called elementary trees. We refer to the root of an elementary tree t as Rt. Each auxiliary tree has exactly ... Prefix Probabilities from Stochastic Tree Adjoining Grammars* Mark-Jan Nederhof DFKI Stuhlsatzenhausweg 3, D-66123 Saarbriicken, ... set of all trees t such that (i) t is a su...

Ngày tải lên: 20/02/2014, 18:20

... adjoin trees from the same set into each other. Thus, we can interpret TAGs with relaxed dominance as MC-TAGs, by identifying subtrees containing only ID relations with trees in an MC-TAG tree ... constraint: the foot node of the first tree (~1) in the tree set of Figure 3 has to dominate the root node of the second tree (~z) after adjoining the tree set. This is indicated...

Ngày tải lên: 22/02/2014, 10:20

... of trees, called initial trees and auxiliary trees respectively. The trees in the set IuA are called elementary trees. We assume that the reader is familiar with the definitions of adjoining ... Lexicalized Tree Adjoining Grammars (Schabes et al., 1988) are a refinement of TAGs such that each elementary tree is associated with a lexieal item, called the anchor of the...

Ngày tải lên: 22/02/2014, 10:20

... derivations from parse trees. MCMC sampling is a widely used approach for obtaining random samples from a probability distribution. In our case, we wish to obtain deriva- tion samples of an SR-TSG from ... rules). The productions take the form of elementary trees i.e., tree fragments of height ≥ 1. The root and internal nodes of the elemen- tary trees are labeled with nonterminal symb...

Ngày tải lên: 19/02/2014, 19:20

... elementary tree from its lexi- cal anchor upwards. Each item in the sequence corresponds to a node in the tree (with the se- quence as a whole corresponding to a complete traversal of the tree) , ... the root label of the tree recognised is. This can be recovered from the 'valid tree& apos; annotation of the complete item itself (there may be more than one valid tree,...

Ngày tải lên: 20/02/2014, 18:20

... str!ng, the derived tree structure of the string. The formalism of tree- adjoining grammars (TAG), on the other hand, decouples these two notions of derivation tree and derived tree. Intuitively, ... these methods rely on the derivation tree as the source of the important primitive relation- ships among trees. The decoupling of derivation trees from derived trees thus make...

Ngày tải lên: 20/02/2014, 21:20

... XynA from C. cellulovorans (GH11-Doc- CE4) [35] and XynA from C. thermocellum strain ATCC27405 (GH11-CBM6-Doc-CE4) [33], or associ- ated with a CBM6 module such as in XynB (GH11- CBM6-Doc) from ... endoxylanase from a corn stalk rot strain of Erwinia chrysanthemi. Phytopathology 83, 332–338. 29 Keen NT, Boyd C & Henrissat B (1996) Cloning and characterization of a xylanase gene f...

Ngày tải lên: 18/02/2014, 08:20

... viral particles isolated from different tissues. Amino acid changes in the N-terminal domain of E2 occurred more frequently in virions isolated from whole plasma and liver than from lipoprotein-associated ... least doubts. Hadlock et al. [34] cloned several antibodies from a patient’s B-cells that prevented the binding of CD81 to recombinant E2 from genotypes 1a, 1b, 2a and 2b. If t...

Ngày tải lên: 19/02/2014, 06:20

... chlapsin, the AP from Chlamydomonas reinhardtii that contains DTG/DTG (accession number: AJ579366) (C. M. Almeida 2 and C. Faro, unpublished results). In some APs from fungi and from protozoa, ... [56]. Similar results were also obtained with AP from Brassica napus seeds [82]. In the case of phytepsin from barley seeds and the AP purified from A. thaliana seeds, it was shown that b...

Ngày tải lên: 19/02/2014, 12:20

... pair, (b) a tree transformation based mapping, and (c) a tree trans- ducer that performs the mapping. volve tree transformations either between two trees or a tree and a string. The tree transducer, ... language. A regular tree grammar (RTG) closely resembles a context free grammar (CFG), and is a way of de- scribing a language of trees. Formally, define T Σ as the set of trees wit...

Ngày tải lên: 19/02/2014, 19:20