Báo cáo khoa học: "Baselines and Bigrams: Simple, Good Sentiment and Topic Classiﬁcation" ppt

... 2012.c2012 Association for Computational LinguisticsBaselines and Bigrams: Simple, Good Sentiment and Topic ClassiﬁcationSida Wang and Christopher D. ManningDepartment of Computer ScienceStanford ... longer doc-uments, for sentiment, topic and subjectivity clas-siﬁcation, and is often better than previously pub-lished results. Therefore, NBSVM seems to be anappropriate and very strong baseline ... that MNB is normally better and morestable than multivariate Bernoulli NB, and the in-creasingly known result that binarized MNB is bet-ter than standard MNB. The code and datasets toreproduce...

Tài liệu Báo cáo khoa học: "Cross-Domain Co-Extraction of Sentiment and Topic Lexicons" pdf

... k2 sentiment words and topic words with highest scores as candidates.5: Construct a bipartite graph between sentiment and topic words on DlT and the k2 sentiment- and topic- word can-didates, and calculate ... denotes wia topic word, and yi= 3 denotes wineither a sentiment nor topic word. Our goal is to predict labels on DTto extract topic and sentiment words for constructing topic and 411 sentiment ... scoresS1 and S3of the k2 sentiment and topic word candidates using Eqs. (5) and (6) iteratively.7: Select k1new sentiment words and k1new topic wordswith the ﬁnal scores, and add them...

Tài liệu Báo cáo khoa học: "Which Are the Best Features for Automatic Verb Classiﬁcation" pdf

... semantic role label-ing (Swier and Stevenson, 2004; Gildea and Juraf-sky, 2002), natural language generation for machinetranslation (Habash et al., 2003), and deriving pre-dominant verb senses ... extend-ing existing lexicons (Korhonen and Briscoe, 2004),building and tuning lexical information speciﬁc todifferent domains (Korhonen et al., 2006), and boot-strapping verb lexicons for new ... subject-objectalternation for melt.• Tense, voice and aspect: Verb meaning and al-ternations also interact in interesting ways withtense, voice, and aspect. For example, mid-dle construction...

Báo cáo khoa học: "Unsupervised Detection of Downward-Entailing Operators By Maximizing Classiﬁcation Certainty" docx

... kitems and 1(xk∈ G) is an indicator functionwhich is 1 if x is in the gold standard list of DEOs and 0 otherwise.DLD09 simply evaluated the top 150 outputDEO candidates by their systems, and ... extracted NPI contexts N and they containtokens(C) and tokens (N ) tokens respectively.Let y be a candidate DEO, countC(y) be the uni-gram frequency of y in a corpus, and countN(y)be the ... that co-learns DEOs and NPIs, and achieves the best results in identifyingDEOs in two corpora.1 IntroductionReasoning about text has been a long-standingchallenge in NLP, and there has been...

Tài liệu Báo cáo khoa học: "Word representations: A simple and general method for semi-supervised learning" doc

... results and Ta-ble 3 shows the final NER F1 results. We compareto the state-of-the-art methods of Ando and Zhang(2005), Suzuki and Isozaki (2008), and forNER—Lin and Wu (2009). Tables 2 and 3 ... tasks.Lin and Wu (2009) finds that the representationsthat are good for NER are poor for search queryclassification, and vice-versa. We apply clus-tering and distributed representations to NER and ... 81.44Brown+Gaz 93.25 89.41 82.71Lin and Wu (2009), 3.4B - 88.44 -Ando and Zhang (2005), 27M 93.15 89.31 -Suzuki and Isozaki (2008), 37M 93.66 89.36 -Suzuki and Isozaki (2008), 1B 94.48 89.92...

Tài liệu Báo cáo khoa học: Secondary substrate binding strongly affects activity and binding afﬁnity of Bacillus subtilis and Aspergillus niger GH11 xylanases docx

... xy-lanases and other glycoside hydrolases will need to bedetermined.Materials and methodsMaterialsAll chemicals, solvents and reagents were purchased fromSigma-Aldrich (Bornem, Belgium) and are ... werepooled and dialyzed against a sodium acetate buffer(200 mm, pH 4.0).XBS and XANAll puriﬁed XBS, XAN and mutant variants were freefrom protein impurities as veriﬁed by SDS ⁄ PAGE and silver ... both XBS and XAN involvedin substrate interaction were selected based on thecrystal structures of XBS and XAN soaked with xylo-tetraose and xylopentaose, respectively [12] (Fig. 1), and were...

Tài liệu Báo cáo khoa học: Amprenavir complexes with HIV-1 protease and its drug-resistant mutants altering hydrophobic clusters docx

... residues 79 and 80, and Asp25, respectively. Mutation to smaller sidechains caused loss of internal hydrophobic interac-tions in the PRI50V and PRI54Vstructures. PRI84V,PRV32I and PRI50Vshowed ... different inter-actions between PR and inhibitors, the absence of theC-HÆÆÆO contact between flap residue 50 and Thr80 inPRI50V–APV, and its presence in PRI50V–SQV and PRWTcomplexes, contributes ... proceduresProtein expression and purificationPR and mutants were constructed with five mutationsQ7K, L33I, L63I, C67A and C95A to prevent cysteine-thioloxidation and diminish autoproteolysis...

Tài liệu Báo cáo khoa học: a-Defensins increase lung ﬁbroblast proliferation and collagen synthesis via the b-catenin signaling pathway doc

... kinase and PI3K ⁄ Akt and increase phosphorylation of GSK3bon Thr390 and Ser9. SB203580 and LY294002 pre-vented a-defensin-induced increases in the proteincontents of Thr390-phosphorylated and ... a-defensin-1 and a-defensin-2 induced increases in the phosphorylationof GSK3b and b-catenin activation and that inhibitionof b -catenin activation prevented a-defensin-inducedproliferation and collagen ... a-defensin-1 and a-defensin-2increases collagen synthesis, HFL-1 lung ﬁbroblastswere incubated with a-defensin-1 and a-defensin-2(0.5–6 lm) for 24 h and then collagen protein content and the collagen-I...

Tài liệu Báo cáo khoa học: Pyruvate reduces DNA damage during hypoxia and after reoxygenation in hepatocellular carcinoma cells pptx

... content (oxidized and reduced forms) was assayed in the cells immedi-ately after incubation (6 h), and 1 and 2 h after reoxy-genation (Fig. 4).Under normoxia, intracellular reduced and oxidizedglutathione ... intra-cellular and extracellular compartments: HepG2 cells were incubatedfor 6 h under normoxic and hypoxic conditions in the absence and presence of pyruvate (1 mM). Intracellular and extracellular ... electrophoresis,which allows detection of single-strand and double-strandbreaks.Cells cultivated in Petri dishes (25 mm in diameter)were suspended in 0.5 mL of NaCl ⁄ Pi, and cell densitywas estimated with...

Tài liệu Báo cáo khoa học: Mechanism of dihydroneopterin aldolase NMR, equilibrium and transient kinetic studies of the Staphylococcus aureus and Escherichia coli enzymes docx

... significanteffects either. The dissociation rate constants forDHNP and DHMP were estimated from those for NP and MP and the difference between HP and HPO and finalized by iterative fittings as described in the ... NP, and MP were purchasedfrom Schircks Laboratories (Jona, Switzerland). Restrictionenzymes and T4 ligase were purchased from New EnglandBiolabs (Ipswich, MA, USA). Pfu DNA polymerase and the ... viathe deprotonation and re-protonation of C2¢ and report a comprehensive equilibrium and kinetic studyof SaDHNA and EcDHNA, which represent DHNAsfrom Gram-positive and Gram-negative bacteria,respectively....

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