Báo cáo khoa học: "Strong Lexicalization of Tree Adjoining Grammars" docx

... superscripts of the la- bels in the tree of Figure 1. The subtree of t at posi- tion p ∈ pos(t) is denoted by t| p , and the label of t at position p by t(p). Moreover, t[u] p denotes the tree obtained ... the maximal rank of the non- terminals only increases by 1. Thus, simple context-free tree grammars strongly lexicalize tree adjoining grammars and themselves. 1 Introdu...

Ngày tải lên: 07/03/2014, 18:20

... presence of hemocyanin in a broad range of ametabolous and hemimetabolous hexapod taxa. We obtained a total of 12 full-length and 5 partial cDNA sequences of hemo- cyanins from representatives of Collembola, ... hemolymph of many arthropod species [1–4]. They are composed of six identical or similar subunits with molecular masses of around 75 kDa [1,3]. A subunit may bind to a...

Ngày tải lên: 18/02/2014, 08:20

... understanding of the differences in the kinds of non-fluencies that occur, we are left with a kind of grab bag of grammatical deviation that can never be analyzed except by some sort of general ... corpus of over twenty hours of transcribed speech, in the process of using the parser to search for various syntactic constructions. Tht~ transcripts are of sociolinguistic...

Ngày tải lên: 21/02/2014, 20:20

... organizers collect sequences of ‘targets’ i.e. of pro- teins, the structure of which are likely to be solved within a few weeks. These sequences are made available to the community of computational biologists ... experi- mental communities that the prediction of the structure of proteins non-evolutionarily related to proteins of known structure is not completely out of reach....

Ngày tải lên: 07/03/2014, 16:20

... stochastic versions of other kinds of grammars. We describe two computationally-tractable ways of estimating the parameters of such grammars from a train- ing corpus of syntactic analyses, ... features of a PCFG are indexed by productions, i.e., the value fi(w) of feature fi is the number of times the ith production is used in the derivation w. This set of features i...

Ngày tải lên: 08/03/2014, 06:20

... in a parse tree of a sentence. Each of these efforts employed the use of parse tree paths as predictive features, encoding the series of up and down transitions through a parse tree to move ... harmonic mean of precision and recall. Our calculation of recall scores represents the best-possible performance of systems using only these types of parse -tree paths. Th...

Ngày tải lên: 20/02/2014, 12:20

... set of all nodes in the left (right) portion of some tree in IuA. Note that the three sets Middle-nodes, Left-nodes and Right-nodes constitute a partition of the set of all nodes of trees ... 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...

Ngày tải lên: 22/02/2014, 10:20

... node of an auxiliary tree is called the spine of the auxiliary tree. An elementary tree is either an initial tree or an auxiliary tree. We use a to refer to initial trees and/3 for auxiliary trees. ... set of nonterminals symbols, VT is a finite set of terminal symbols, S E V/v is the start symbol, I is a finite set of initial trees, A is a finite set of auxiliary tr...

Ngày tải lên: 22/02/2014, 10:20

... 08:00–18:00 (47% of calls during 42% of the day), a substantial proportion of MET calls occur after normal working hours (53% of calls during 58% of the day), with the peak time of activity occurring ... time, a detailed analysis of the level of utilization of a MET service over a 24-hour period and found a significant increase in the number of MET calls around periods of...

Ngày tải lên: 25/10/2012, 10:45

... molecular mode of action of glypho- sate and the molecular basis for glyphosate resistance. Structure and function of EPSPS EPSPS catalyzes the transfer of the enolpyruvyl moiety of phosphoenolpyruvate ... however, was devoid of substrate or inhibitor, and consequently did not reveal the nature of the active site or the mode of action of glyphosate. A dec- ade later, the cry...

Ngày tải lên: 14/02/2014, 14:20