Báo cáo khoa học: "Acquisition of Conceptual Data Models from Natural Language Descriptions" doc

... derived from the structures of natural language, on the justification that a database comprises a set of sentences and the purpose of the conceptual darn model is to specify a grammar of the ... Acquisition of Conceptual Data Models from Natural Language Descriptions William J.Black, Department of Computation, UMIST, PO Box 88, Sackville Street, ... tr...

Ngày tải lên: 09/03/2014, 01:20

Ngày tải lên: 23/03/2014, 14:20

... DISPLACEMENT of 320 and a LENGTH of 144. (4) 7%11 aircraft carriers in the ONR database have R~S of 0, FUEL TYPE of BNKR, FLAG of BLBL, BEAM of 252, ENDURANCE RANGE of 4000, ECONOMIC SPEED of 12, ... and OFFICIAL NAME. 4) Ocean escorts have a DISPLACEMENT ~tween 3400 and 4100. 5) All ocean escorts in the ONR database have R~MARKS of 0, FUEL TYPE of BNKR, FLAG of B...

Ngày tải lên: 17/03/2014, 19:21

... help learn to process natural language queries and translate them into a database query language. Also, WOLFIE could possibly assist in translation from one natural language to another. 2 ... Acquisition of a Lexicon from Semantic Representations of Sentences* Cynthia A. Thompson Department of Computer Sciences University of Texas 2.124 Taylor Hall Austin, ... Le...

Ngày tải lên: 17/03/2014, 09:20

... ism of conceptual graphs (Sowa 1976, 1978). Conceptual graphs serve two purposes: like other forms of semantic net- works, they can be used as a canonical representation of mean- ing in natural ... (1973) proposed surface models as incomplete, but extendible, finite constructions: Usually, models are thought of as being given through a specifi- cation of a number...

Ngày tải lên: 31/03/2014, 17:20

... only after partial unfold- ing of the a-helix from the body of the b-sheet (Fig. 2C). Possible role of domain-swapping in the ‘off-pathway folding’ (OFF) model The OFF model for amyloid formation ... our understanding of the importance of different parts of the molecule and their flexibility in the process of amy- loid fibril formation often results more from a struc- tural an...

Ngày tải lên: 14/02/2014, 18:20

... O 2 reduction [1]. The overall outcome of the catalytic cycle is reduction of one mole- cule of dioxygen into two molecules of water, coupled with oxidation of four substrate molecules (phenols ... a variant of a M. thermophila laccase capable of resisting a wide array of co-solvents at con- centrations as high as 50% v ⁄ v [14]. In all available examples of molecular evolut...

Ngày tải lên: 18/02/2014, 06:20

... both the early and late stages of protein breakdown. The activity of cathepsin B is regulated in many ways, ranging from the pH of the environment to the presence of endogenous inhibitors (i.e. ... the presence of various concentrations of 2A2 mAb. The binding of 2A2 mAb was followed by native gel elec- trophoresis. Increasing the concentration of 2A2 mAb at a fixed molar rat...

Ngày tải lên: 18/02/2014, 11:20

... reaction, because of the broad band (shoulder) formed in the 350 nm region. By subtracting the spectrum of native LCAO from the spectrum of the radical, or from the spectra of the inactivated ... modification induced by H 2 O 2 , but the similarity of the behavior of several amine oxidases suggested that it consists of the oxidation of a conserved residue at the active site...

Ngày tải lên: 19/02/2014, 12:20

... shut off. By contrast, when there is demand for large excesses of a particular type of tRNA, as in the PSG, and sufficient quantities of transcription factors are available, transcription from ... region of tRNA Gly 1 -6,7 (at position )26 with respect to the +1 of tRNA) proper positioning of the TATA sequences appeared necessary for the formation of stable complexes. The mere...

Ngày tải lên: 20/02/2014, 02:21