简介:WordSenseDisambiguation(WSD)istodecidethesenseofanambiguouswordonparticularcontext.MostofcurrentstudiesonWSDonlyuseseveralambiguouswordsastestsamples,thusleadstosomelimitationinpracticalapplication.Inthispaper,weperformWSDstudybasedonlargescalereal-worldcorpususingtwounsupervisedlearningalgorithmsbasedon±n-improvedBayesianmodelandDependencyGrammar(DG)-improvedBayesianmodel.±n-improvedclassifiersreducethewindowsizeofcontextofambiguouswordswithclose-distancefeatureextractionmethod,anddecreasethejammingofuselessfeatures,thusobviouslyimprovetheaccuracy,reaching83.18%(inopentest).DG-improvedclassifiercanmoreeffectivelyconquerthenoiseeffectexistinginNaive-Bayesianclassifier.ExperimentalresultsshowthatthisapproachdoesbetteronChineseWSD,andtheopentestachievedanaccuracyof86.27%.
简介:UnlikeIndo-Europeanlanguages,Mandarinreliesheavilyonlexicaltonestodistinguishwordidentity.Usingtheintermodalpreferentiallookingparadigm,thisstudyexamined3-year-oldMandarinspeakers'abilitytouseMandarinlexicaltonesinlearningnewwords.ResultsshowedthatwhenchildrenwerepresentedwithTone2(rising)andTone4(falling)pairs,childrensuccessfullylearnedbothwords.However,whenchildrenwerepresentedwithTone2andTone3(dipping)pairs,theylearnedtheTone2wordbutnottheTone3one.ChildrenwerethendividedintotwogroupsbasedontheirlearningperformanceontheTone3word.SuccessfullearningofTone3wordswasobservedinthehighperformersbutnotinthelowperformers,whoconsistentlymisusedTone3asTone2.ThisstudyshowedthatMandarinspeaking3-year-oldscoulduselexicaltonestolearnwordsunderexperimentalconditions,andthatthedifficultyofTone3acquisitionmayberelatedtoitslowerlevelofperceptualdistinctivenesscomparedwithothertones.