Báo cáo khoa học: "Semantic enrichment of journal articles using chemical named entity recognition" pptx

... Proceedings of the ACL 2007 Demo and Poster Sessions, pages 45–48, Prague, June 2007. c 2007 Association for Computational Linguistics Semantic enrichment of journal articles using chemical named entity recognition Colin ... 1EW ptc24@cam.ac.uk Abstract We describe the semantic enrichment of journal articles with chemical structures and biomedi- cal ontology terms...

Ngày tải lên: 31/03/2014, 01:20

... Over the set of 5 semantic rela- tions defined by Nastase and Szpakowicz (2003), they achieve an accuracy of 45.7% for the task of assigning one of 5 semantic relations to each of the 600 modifier-noun ... conditions, and again using all of the joining terms produced the best results. The SVM algorithm produced the best accuracy of all, achieving 50.1% accuracy using...

Ngày tải lên: 20/02/2014, 12:20

... Evaluation Sophia Katrenko Institute of Informatics University of Amsterdam the Netherlands katrenko@science.uva.nl Pieter Adriaans Institute of Informatics University of Amsterdam the Netherlands pietera@science.uva.nl Abstract This ... 7 binary relations from the training set of the SemEval-2007 competition, all definitions of which share the re- quirement of the syntactic clos...

Ngày tải lên: 08/03/2014, 01:20

... enough sample of prior data (measured as M, the number of subtrees below the current node) on which to form a reliable estimate of the mean and variance of each feature or class of features. For example, ... class of similar hierarchi- cal priors, smoothed to varying degrees, and lay the groundwork for future exploration in this area. 1 Introduction 1.1 Problem definition Consider...

Ngày tải lên: 23/03/2014, 17:20

... composed of three separate models, one for just named entity recog- nition, one for just parsing, and one for joint pars- ing and named entity recognition. In this section we will review each of these ... separate parse and named entity models give conflicting output. entity models trained on larger corpora, annotated with only one type of information. This paper addresses...

Ngày tải lên: 30/03/2014, 21:20

... the purpose of automatic tagging of the queries. We will define a set of probabilistic context-free rules, which generates bags (i.e. multi-sets) of words. Us- ing this new type of rule in ... the design and implementation of a parser for this kind of grammar. Section 5 gives an example of such a grammar designed for the purpose of automatic tagging of queries. Sectio...

Ngày tải lên: 08/03/2014, 00:20

... good result both of DBA and SBA. The precision of DBA, the ratio of correct analyses to detected anal- yses, was 77% (=137/(137+19+21)); the re- call of DBA, the ratio of correct analyses ... information of nouns in an ordinary dictio- nary. 2 Semantic Roles of Nouns The meaning of a word can be recognized by the relationship with its semantic roles. In the case of...

Ngày tải lên: 08/03/2014, 06:20

... decision of gender had led to deterioration in MRR performance of the male names compared to the case where no prior information was assumed. Soft decision of gender yielded further gains of 17.1% ... accuracies (%) using a 4-gram language model for the letter sequence of the source name in Latin script. Table 5 summarizes the gender detection accura- cies using Eq. (11...

Ngày tải lên: 17/03/2014, 04:20

... degrees of factuality for events. None of the above references aim at detecting or annotating the focus of negation in natural language. Neither do they aim at carefully representing the meaning of ... representing the se- mantics of negation by revealing implicit positive meaning. The main contributions are: (1) interpre- tation of negation using focus detection; (2) focus of...

Ngày tải lên: 30/03/2014, 21:20

... num- ber of contexts are large enough to ensure it is reliable. We have experimented with a wide range of cutoffs and the best performance on the 1.6 test set was achieved us- ing a minimum cutoff of ... Previous Work A considerable amount of research addresses structurally and statistically manipulating the hierarchy of WORD- NET and the construction of new wordnets using the c...

Ngày tải lên: 31/03/2014, 03:20