Tài liệu Báo cáo khoa học: "Coreference for Learning to Extract Relations: Yes, Virginia, Coreference Matters" ppt

... Association for Computational Linguistics:shortpapers, pages 288–293,Portland, Oregon, June 19-24, 2011.c2011 Association for Computational Linguistics Coreference for Learning to Extract Relations: ... incorrect (e.g. ‘X visited Y’ for hasBirthPlace).7 Figure 1: Approach to learning relations We ran this system in two versions: –Coref has no access to coreference information, while +Coref ... noisy, coreference infor-mation improved F-scores for all relations in our test, more than doubling the F-score for 5 of the 10. Why is the high error rate of coreference not very harmful to...

Tài liệu Báo cáo khoa học: "A Composite Kernel to Extract Relations between Entities with both Flat and Structured Features" ppt

... somewhat effective for relation extraction. This suggests that structured syntactic information has good predication power for rela-tion extraction and the structured syntactic in-formation can ... methods and significantly out-performs previous two dependency tree ker-nels for relation extraction. 1 Introduction The goal of relation extraction is to find various predefined semantic ... included as the context to T2 and make T3 context-sensitive. This is to evaluate whether the limited context information in CPT can boost performance. FPT in T4 is formed by removing the...

Tài liệu Báo cáo khoa học: "Segmentation for English-to-Arabic Statistical Machine Translation" ppt

... sourcebeneﬁts the performance of Arabic -to- English SMT.The use of similar techniques for English -to- ArabicSMT requires recombination of the target side intovalid surface forms, which is not ... recombined into a surface form.This proves to be a non-trivial challenge for a num-ber of reasons:1. Morpho-phonological Rules: For example, thefeminine marker ’p’ at the end of a wordchanges to ’t’ ... training data to trainthe language model and use trigrams for the baselinesystem and a 4-grams for segmented Arabic. The av-erage sentence length is 9 for English, 8 for Arabic,and 10 for segmented...

Tài liệu Báo cáo khoa học: "Semi-supervised Learning of Dependency Parsers using Generalized Expectation Criteria" ppt

... indirect methods for leveraging prior knowledge can be cumbersomeand unintuitive for a non-machine -learning expert.This paper proposes a method for directly guid-ing the learning of dependency ... which we obtainaccuracy comparable to supervised learning withtens to hundreds of complete parsed sentences.2 Related WorkThis work is closely related to the prototype-driven grammar induction ... sentences (both because ofthe time it takes to create an appropriate rubric and to train annotators).There are also a number of methods for unsu-pervised learning of dependency parsers. Kleinand...

Tài liệu Báo cáo khoa học: "A Prototype Text to British Sign Language (BSL) Translation System" ppt

... fully instantiated forms for ﬁxed and body-anchored signs, however others are only partially in-stantiated forms for directional verbs and forms ofmodulation of lexical items. For nominal orientedsigns, ... isused to associate pronouns with discourse referents,and reuse of nouns is used to imply co-reference to the same linguistic referent. Currently, the mostcommon 50% CMU links are transformed into ... transformed into DRSform.3.3 Semantic TransferAn English oriented DRS is transformed into a SLoriented DRS. In particular, the number of argu-ments for some predicates is modiﬁed to a differentnumber...

Tài liệu Báo cáo khoa học: Looking for the ancestry of the heavy-chain subunits of heteromeric amino acid transporters rBAT and 4F2hc within the GH13 a-amylase family ppt

... the Caatoms of 436 corresponding residues)than between 4F2hc proteins and GH13 enzymes(1.67 A˚ for 293 Caatoms) as well as rBATs and 4F2hcproteins mutually (1.80 A˚ for 271 Caatoms). ... speciﬁcities and several thousand sequences[3,13,18] where, for example, it is still complicated to trace clearly the evolutionary history, even just for theanimal a-amylase [39].ConclusionsThe examples ... were analysedusing the selecton tool [38] at http://selecton.tau.ac.il/.The ratio between nonsynonymous (Ka) and synony-mous (Ks) substitutions was calculated for every codonusing the default...

Tài liệu Báo cáo khoa học: Role for nectin-1 in herpes simplex virus 1 entry and spread in human retinal pigment epithelial cells docx

... could be important for HSV-1 entry into RPEcells.Nectin-1 acts as the major receptor for HSV-1entry into RPE cells To determine which receptors were important for HSV-1 entry into RPE cells, previously ... intocorneal fibroblasts (CFs) leads to changes in actincytoskeleton [29]. We also decided to examine whethercytoskeletal changes played any significant role inHSV-1 entry into RPE cells. To ... inflammatory orbitopathy,proptosis, and optic nerve involvement. Immunohisto-chemical studies have detected HSV-1 antigens in theretinal periphery [26].In an effort to determine a mechanism for...

Tài liệu Báo cáo khoa học: Evidence for noncooperative metal binding to the a domain of human metallothionein ppt

... thesepapers clearly show domain-speciﬁc binding for M2+(M ¼ Zn, Cd) initially to the a domain, thereby lead-ing to formation of the M4a cluster prior to formationof the M3b cluster, demonstrating ... in independent tetra-thiolate sites, the choice for the third incoming metalion would be to form a bridging interaction in thea domain or to form another independent tetrathiolatesite in the ... proceeds. Finally, K3aand K4a for the adomain would have to be greater than K2band K3b for the b domain, to explain the observed ﬁlling of thea domain prior to that of the b domain.Although...

Tài liệu Báo cáo khoa học: Progress for dengue virus diseases Towards the NS2B–NS3pro inhibition for a therapeutic-based approach ppt

... DENv.Much remains to be performed to achieve results suit-able for experimentation in clinical trials and to pro-duce a drug for blocking the DENv spread. To date,funding for a co-ordinated ... cofac-tor could be examined for a view to inhibitor develop-ment, and competitive inhibitors of the binding sitemight be able to inhibit the correct fold of the protease.At present, no inhibitors ... step towards design of an inhibitor for theDENv NS3 serine protease, the standard inhibitors ofserine proteases have been assayed. The serine proteaseinhibitor, aprotinin, has been shown to...

Tài liệu Báo cáo khoa học: Enzymes for the NADPH-dependent reduction of dihydroxyacetone and D-glyceraldehyde and L-glyceraldehyde in the mould Hypocrea jecorina doc

... l-glyceraldehyde to glycerol, whereas GLD2 catalyses the con-version of dihydroxyacetone to glycerol. Both enzymes are speciﬁc for NADPH as a cofactor. The properties of GLD2 are similar to those of ... d-galactonate and l-galactonate (in the d-galac-turonate pathway) are converted by a dehydratase to the corresponding 2-keto-3-deoxy sugar acid, which isthen split by an aldolase to form pyruvate ... was cloned, similar to gld1, ﬁrst in a TOPOvector and then in the expression vector p2159. The S. cere-visiae strain CEN.PK2-1B was then transformed with theexpression vector.The gld1 and gld2...

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