Báo cáo khoa học: "Fast Full Parsing by Linear-Chain Conditional Random Fields" docx

... March – 3 April 2009.c2009 Association for Computational LinguisticsFast Full Parsing by Linear-Chain Conditional Random FieldsYoshimasa Tsuruoka†‡Jun’ichi Tsujii†‡∗Sophia Ananiadou†‡†School ... chunking-based dis-criminative approach to full parsing. Weconvert the task of full parsing into a seriesof chunking tasks and apply a conditional random ﬁeld (CRF) model to each levelof chunking. ... traditional approach to discriminative full parsing is to convert a full parsing task into a seriesof classiﬁcation problems. Ratnaparkhi (1997)performs full parsing in a bottom-up and left-to-right...

Báo cáo khoa học: "Jointly optimizing a two-step conditional random ﬁeld model for machine transliteration and its fast decoding algorithm" pdf

... decodingalgorithm3.1 Joint optimizationWe denote a word in the source language by S, asegmentation of S by A, and a word in the targetlangauge by T . Our goal is to ﬁnd the best wordˆTin the target language ... Japan{raymond,dixonp,furui}@furui.cs.titech.ac.jpAbstractThis paper presents a joint optimizationmethod of a two-step conditional random ﬁeld (CRF) model for machine transliter-ation and a fast decoding algorithm forthe ... conversion very difﬁcult; second, thetransliteration is usually not only determined by the pronunciation, but also affected by how theyare written in the original language.Direct orthographical mapping...

Báo cáo khoa học: "Fast and accurate query-based multi-document summarization" docx

... docu-ments and topics. Summary sentences areranked by a regression SVM. The summa-rizer does not use any expensive NLP tech-niques such as parsing, tagging of names oreven part of speech information. ... computationally less expensive than other fea-tures (i.e., full parse). Since FastSum can rely ona minimal set of features determined by LARS, itcan process 1250 news documents in 60 seconds.1A ... areadded up and normalized by length. Sentence-basedfeatures include the length and position of the sen-tence in the document. The starred features 1 and4 are introduced by us, whereas the others...

Tài liệu Báo cáo khoa học: "Fast Unsupervised Incremental Parsing" pdf

... otherwiseThe update of Axi by α begins by incrementingthe count:#(Axi) += 1If α is a boundary symbol (∅lor ∅r) or if x and αare words separated by stopping punctuation (full stop, question ... searchspace for both learning and parsing. The represen-tation the parser uses is designed for incremental parsing and allows a preﬁx of an utterance to beparsed before the full utterance has been read ... the new lexicon Ls+1.Any of the lexicons Lsconstructed by the learnermay be used for parsing any utterance U , but as sincreases, parsing accuracy should improve. Thislearning process is...

Tài liệu Báo cáo khoa học: "Statistical Machine Translation by Parsing" pptx

... I)ordinary parsing (D=I=1)generalized parsing (any D; any I)Figure 1: Generalizations of ordinary parsing. ago (Aho & Ullman, 1969), but here we articu-late it in more detail: ordinary parsing ... structures.translationsynchronizationsynchronous parsing 1 parsing 32231 ordinaryI = dimensionality of inputD = dimensionality of grammarsynchronization(I >= D) parsing synchronous(D=I)wordalignmenttranslation(D ... probability, the number of possi-ble derivations, etc. All the parsing semirings cat-alogued by Goodman apply the same way to syn-chronous parsing, and to all the other classes of al-gorithms discussed...

Báo cáo khoa học: "AN ISLAND PARSING INTERPRETER FOR THE FULL AUGMENTED TRANSITION NETWORK FORMALISM" potx

... Cambridge CB2 3QG England ABSTRACT Island parsing is a powerful technique for parsing with Augmented ~ansition Networks (ATNs) which was developed and successfully applied in the HWIM speech understanding ... observations about island parsing, based on the use of the parser described, and some suggestions for future directions for island parsing research. I INTRODUCTION A. Island Parsing In an ordinary ... application grammar did not, however, exploit Woods' original full ATN specification. This paper describes an island parsing interpreter based on HWIM, but containing substantial and important...

Báo cáo khoa học: "Fast Context-Free Parsing Requires Fast Boolean Matrix Multiplication" pptx

... from that used by Satta (1994) for tree-adjoining grammar (TAG) parsing, is to show that BMM can be efficiently reduced to CFG parsing. Satta's result does not apply to CFG parsing, since ... provide a formal definition of parsing motivated by an informal notion due to Lang. Our re- sult establishes one of the first limita- tions on general CFG parsing: a fast, practical CFG ... the parsing algorithms mentioned in the introduction, and can be thought of as a formalization of Lang's informal definition of parsing. 3 The reduction We will reduce BMM to c -parsing, ...

Tài liệu Báo cáo khoa học: Degradation of tropoelastin by matrix metalloproteinases – cleavage site speciﬁcities and release of matrikines pptx

... explained by thefact that the GYGPG motif is preceded by eightamino acids that could facilitate the adoption of anactive conformation and its stabilization. This hasalso been suggested by Moroy ... ionization mode and reﬂectron mode by accumulat-ing data from 1800 laser shots per spot. Data acquisition wasperformed by flex control 3.0.101.1, which was controlled by warplc 1.1 (Bruker Daltonik). ... released by MMP-7;22 sequences, of which 11 were nonrepetitive,were found in 23 peptides released by MMP-9; and 20sequences, of which 13 were nonrepetitive, werefound in 41 peptides released by...

Tài liệu Báo cáo khoa học: Perturbation of membranes by the amyloid b-peptide – a molecular dynamics study pptx

... normal and the vector deﬁned by the ﬁrstmethylene carbon and the terminal methyl carbon onthe acyl chain. A description of effective chain lengthhas been proposed by Petrache et al. [42] (thereintermed ... Membrane perturbation by Alzheimer’s AbFEBS Journal 276 (2009) 3060–3075 ª 2009 The Authors Journal compilation ª 2009 FEBS 3069lipid chains elongate, as demonstrated by a smallincrease in ... are in the case ofAb40.Disordering of nearby lipidsIn our simulations, both Ab40 and melittin demon-strated the ability to cause disorder in nearby lipids. Inthe case of Ab40, we consider...

Tài liệu Báo cáo khoa học: Amino acid discrimination by arginyl-tRNA synthetases as revealed by an examination of natural speciﬁcity variants doc

... quantiﬁed by scintillation counting. Preparative aminoacylation reactions,scaled to 100 lL, were allowed to reach a plateau, rapidlyextracted with phenol, and the aminoacylated tRNA wascollected by ... link under the acidic conditions of nuclease treat-ment was conﬁrmed by separate experiments. Radioactivitywas detected by phosphorimager analysis (PharosFXPlus; Bio-Rad, Munich, Germany), ... Fersht AR & Kaethner MM (1976) Enzyme hyperspeci-ﬁcity. Rejection of threonine by the valyl-tRNA synthe-tase by misacylation and hydrolytic editing.Biochemistry 15, 3342–3346.7 von der Haar...

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