粗糙集并行约简算法研究

粗糙集并行约简算法研究

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时间:2019-05-15

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1、RESEARCHONALGORITHMSOFPARALLELREDUCTSnqROUGHSETSABSTRACTBydefiningtheconceptsofupperapproximationandlowerapproximationroughsetsmakethevaguedegreecomputableSoithasparticularadvantageswhenitwasusedtodealwithincompleteandimprecisedata:1)Needingnoprioriknowledge;2)Moreobjecti

2、veandprecise;31Highlycomplementary'withothertheoriesofuncer【aintyDuetotheseadvantagesroughsetstheoryhasbeenfullydevelopedandwideb’usedsinceitwasproposedabout30yearsagoDuringmanyyearsdevelopmenttheavailabilityofroughsettheoryhasbeenfully、erifiedandtheoryframeworkhasbeenimp

3、rovedaswellButthechallenge.howtoobtainastablereductfromadynamicorincreasingdataSethasnotbeensuccessfullysolvedAlthoughdynamicreducttheoryhaspointedolltaverygoodwaytosolvetheissuebutduetoitstimecomplexityofexponentialorder.dynamicreductscouldonlybeusedtoobtainreductsfromth

4、eless-conditionalattributedataTheapplicationofdynamicreductswillbelimitedMoreoverthemethodofdynamicreductsisthegreatlyincompletebecauseintersectionofallofreductsofafamilydecisionsubsystemsmaybeerupt3Tosolvetheissuethathowtoobtainastablereduetfromadynamicorincreasingdatase

5、tDayongDengproposedtheparallelreducttheorySimilartodynamicreductsparallelreductsdivideadecisionsystemintoseveraldecisionsubsystemsandreduceredundantconditionanribute(s)fromthemsimuhaneousl,vfinallyoneormorestablereduct(s)wouldbeobtainedfromthefamilyofdecisionsubsystemsDif

6、ferentfromdynamicreductalgorithm。sexhaustivesearchingamongdecisionsubsystems,parallelreductscanJudgewhetheraconditionattributeismoreimpoaantthanotherswithheuristicinformationintheprocessingofobtainingparallelreductssothetimecompiexit)

7、ofparagelreductalgorithmispolynomialT

8、heparallelreducttheor)isacompletetheoDbecauseitcanavoidtheemptyresultfromitsdefinitionBesides,parallelreducttheor3Callmakeuseofallachievementsofroughsetsbutdynamicreducttheor)cantl】IInthisthesisWeinvestigateparallelreducttheorydeeply,andproposeanimprovedaparallelreduclalg

9、orithmThe㈣algorithmcanobtainaparallelreductwhichcontainsfewereondgionanributeswithinthesametimec

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