Báo cáo khoa học: "Constraints on strong generative power" pdf

... notion of derivational generative capacity (Becker et al., 1992). Definition 3 The strong generative capacity of a grammar G aCFRSF is the relation {t F , t|t ∈T(G)}. For example, the strong generative ... by strong generative power? In the standard definition (Chomsky, 1965) a grammar G weakly generates a set of sentences L(G) and strongly generates a set of structural descri...

Ngày tải lên: 31/03/2014, 04:20

... weakly connected, which entails that the corresponding undirected graph is con- nected, w hereas a strongly connected graph has a directed path between any pair of nodes. 74 (“Only one of them concerns ... to Defi nition 1–2. 3 Constraints The only conditions so far imposed on dependency graphs is that the special node 0 be a root and that the graph be connected. Here are three further const...

Ngày tải lên: 22/02/2014, 02:20

... from similar constructions. The next consideration, and the subject of the present section, is how the construction should be situated within the generation process: what decisions, made at ... the content of the matrix. 209 3.1 Decision Making in Generation In generation, unlike comprehension, the speaker's appreciation of his situation, his goals, and the information that ......

Ngày tải lên: 24/03/2014, 02:20

... to conformational differences between the two proteins. The relative cross-reactivity of poly- clonal antibodies was used to probe the conforma- tional variations at the tertiary level among ... conditions, coordinate a [2Fe–2S] clus- ter. However, based upon the in vitro reconstitution assay, both were found to be [4Fe–4S] cluster coordi- nating proteins. Iron–sulfur clusters are one ... dif...

Ngày tải lên: 18/02/2014, 12:20

... and semantics. Our experiments on question/answer classification show that the above models highly improve on bag-of-words on a TREC dataset. 1 Introduction Question Answering (QA) is an IR task ... Papers (Companion Volume), pages 113–116, Columbus, Ohio, USA, June 2008. c 2008 Association for Computational Linguistics Kernels on Linguistic Structures for Answer Extraction Alessandro...

Ngày tải lên: 20/02/2014, 09:20

... which only makes the anaphoric content 212 of the pronoun she within the NP explicit. The anaphoric relationship between the pronoun she and Mary is represented by the linking relation between ... deduction calculi for rea- soning with such underspecified semantic rep- resentation in order to make progress on this front. We hope that some of the more ad hoc features of our definit...

Ngày tải lên: 20/02/2014, 18:20

... programming environment offers a convenient yet challenging extension of work already being done with database query. First I recite some of the merits of continuing research on natural language ... language. How much these cross-linguistic concerns ought to affect the construction of a particular system is itself one of the questions deserving of atten- tion, but our experience to da...

Ngày tải lên: 21/02/2014, 20:20

... processes. No operations on RefOs other than the sum operation will be considered in the present context. 3. CONSTRAINTS ON SUM FOR- MATION Sentences like (1.a) and (1.b) demon- strate that ... questions. However, we will give some sketchy answers to the first and second questions as well. We consider only two-sentence texts in which the second sentence contains an anaphoric p...

Ngày tải lên: 22/02/2014, 10:20

... activation. Initial Backbone chemistry siRNA sequence End features Key Fig. 1. Design considerations for controlling nonspecific responses to siRNA. This figure summarizes known recognition interactions between ... dsRNAs contained the consensus motif, NNWW(N 9 )WGN (W indicates an A or U), and mutational analysis confirmed that this motif is required for activation. The consensus is only 16 nuc...

Ngày tải lên: 06/03/2014, 01:23

... Jobin Yvon IBH S.A.S.) at 434 nm with 1 MHz repetition. Fluorescence emission was recorded by a picosecond detector, TBX-04 (Horiba, Jobin Yvon IBH S.A.S.). The Jobin Yvon IBH data station and the ... manipulations of the Arg-rich epitope induced alterations in the localization of the resulting receptor proteins, leading to the conclusion that this epitope is responsible for the cellular loca...

Ngày tải lên: 07/03/2014, 03:20