简介：Inthispaper,weinvestigatethenumber,locationandstabilityoflimitcyclesinaclassofperturbedpolynomialsystemswith(2n+1)or(2n+2)-degreebyconstructingdetectionfunctionandusingqualitativeanalysis.Weshowthatthereareatmostnlimitcyclesintheperturbedpolynomialsystem,whichissimilartotheresultofPerkoin[8]byusingMelnikovmethod.Forn=2,weestablishthegeneralconditionsdependingonpolynomial'scoefficientsforthebifurcationlocationandstabilityoflimitcycles.Thebifurcationparametervalueoflimitcyclesin[5]isalsoimprovedbyus.Whenn=3thesufficientandnecessaryconditionsfortheappearanceof3limitcyclesaregiven.Twonumericalexamplesforthelocationandstabilityoflimitcyclesareusedtodemonstrateourtheoreticalresults.

简介：这篇文章在认知收音机基于收到的信号力量介绍经典定位方法并且提出认知收到收音机的信号力量(CR-RSS)解决找到主要用户的第二等的用户的问题并且成功估计主要用户的地点和传播力量的本地化算法。通过认知收音机网络的建立，在CR-RSS途径评估第二等的用户，采样和环境因素的数字到结果。后果证明这个途径罐头有效地找到主要用户，在认知无线电的本地化的技术能帮助网络优化。

简介：Inthispaper,accordingtotheFujianSeismicNetworkearthquakecatalogrecords,theTnowmethodandtheFourStationsContinuousLocationmethod(hereinaftercalledFSCL)putforwardbyJinXingareinspectedbyusingP-wavearrivalinformationofthefirstfourstationsofeachseismicevent.Resultsshowthatforearthquakeswithinthenetwork,bothmethodscanobtainsimilarlocationresultsandlocationdeviationsaresmallforthemajorityoftheevents.Forearthquakesoutsidethenetwork,thelocationdeviationmaybeamplifiedastheepicentraldistanceincreases,owingtotheseismicstationdistributionwhichspreadtowardthesideoftheepicenterandthesmallopeninganglebetweenseismicstationsusedforlocatingandepicenter.FortheFSCLmethod,theimpactsofthewavevelocityonthelocationresultsmaybesignificantforearthquakesoutsidethenetwork.Thus,selectingavelocitymodelwhichissimilartotheactualstructureofthewavevelocitywillcontributetoimprovinglocationresultsofearthquakes.TheFSCLmethodcanlocatemoreseismiceventsthantheTnowmethod.ItconcludesthattheTnowmethodmakesuseofmistakeinformationfromsomenon-triggeringstationsinearthquakecatalog,andsomeP-wavearrivalsarenotincludedintheearthquakecatalogduetodiscontinuousrecordsorunclearrecordsoftheseismicphase,whichinducesincorrectlocation.

简介：Jointlocationandscalemodelsoftheskew-normaldistributionprovideusefulextensionforjointmeanandvariancemodelsofthenormaldistributionwhenthedatasetunderconsiderationinvolvesasymmetricoutcomes.Thispaperfocusesonthemaximumlikelihoodestimationofjointlocationandscalemodelsoftheskew-normaldistribution.Theproposedprocedurecansimultaneouslyestimateparametersinthelocationmodelandthescalemodel.Simulationstudiesandarealexampleareusedtoillustratetheproposedmethodologies.

简介：SupportVectorMachine(SVM)isapowerfulmethodologyforsolvingproblemsinnon-linearclassification,functionestimationanddensityestimation,whichhasalsoledtomanyotherrecentdevelopmentsinkernelbasedmethodsingeneral.Thispaperpresentsahighaccuracyandfault-tolerantSVMforthemobilegeo-locationproblem,whichisanimportantcomponentofpervasivecomputing.Simulationresultsshowitsbasiclocationperformance,andillustrateimpactsofthenumberoftrainingsamplesandtrainingareaontestlocationerror.

简介：山西水库地震是在最近的年，有少数的一个区域和更弱的地震里的南部的浙江省的重要地震事件。seismicity显示出一个断断续续的特征和组分发。地震网络定位的震中没证明一个占优势的方向和seismogenic结构不是清楚的。在学习，非线性的想象的波浪旅行时间方程被线性化并且解决，并且来源位置，起始的想象的速度和旅行时间剩余被获得。然后，由作为时间加倍标准差，剩余，从经度产生的最大的错误，纬度，深度和想象的速度被计算。基因人口用最大的错误被组织，地震地点的结束结果被基因算法获得。有地震大部分是的表演专注于一架在垂直附近的、向西北面向的差错飞机的这个方法的山西水库地震的重定位的结果，和在飞机和到期的北方，到期的东方和垂直方向的正常之间的包括的角度是46~，44~，并且87~分别地。结果与小地震的全面差错飞机答案的一致。地震的平均深度是4.7km，最大的深度9.5kin，和最小的深度1.7km。震中显示出向西北的狭窄的banded分布，并且焦点的深度沿着西北方向增加了。在长带的西北结束长有大约3.5km的不连续的地震差距。使用Borun模型获得的来源参数的特征不与构造地震的显著地不同。地震压力落下关于0.33MPa，并且平均压力落下是0.88MPa。根据压力掉空间分发，在长带的西北结束的地震断绝片断在一个低压力落下地区。

简介：Withtheemergenceoflocation-basedapplicationsinvariousfields,thehigheraccuracyofpositioningisdemanded.Byutilizingthetimedifferencesofarrival(TDOAs)andgainratiosofarrival(GROAs),anefficientalgorithmforestimatingthepositionisproposed,whichexploitstheBroyden-Fletcher-Goldfarb-Shanno(BFGS)quasi-Newtonmethodtosolvenonlinearequationsatthesourcelocationundertheadditivemeasurementerror.Althoughtheaccuracyoftwo-stepweighted-least-square(WLS)methodbasedonTDOAsandGROAsisveryhigh,thismethodhasahighcomputationalcomplexity.Whiletheproposedapproachcanachievethesameaccuracyandbiaswiththelowercomputationalcomplexitywhenthesignal-to-noiseratio(SNR)ishigh,especiallyitcanachievebetteraccuracyandsmallerbiasatalowerSNR.Theproposedalgorithmcanbeappliedtotheactualenvironmentduetoitsreal-timepropertyandgoodrobustperformance.Simulationresultsshowthatwithagoodinitialguesstobeginwith,theproposedestimatorconvergestothetruesolutionandachievestheCramer-Raolowerbound(CRLB)accuracyforbothnear-fieldandfar-fieldsources.

简介：这份报纸基于距离几何学(DG)建议了一个新奇无线地点算法在信号的到达(TOA)的时间过滤的限制(也就是作为DG-TOA)。观察数据过滤并且处理并且基于DG-TOA算法导致数学公式被用于地点，也玩关键规则。模拟结果证明建议DG-TOA算法能提供更多的有效观察数据并且比的更精确最不方形的估计(LSE)算法在稠密，多线路，有变化评价错误的室内的情形。

简介：Aqueryregardingthenowcommonlyacceptedepicentrallocationofthe1216MahuearthquakeinLeiboCounty,SichuanProvinceisproposedafterexaminationoflocalhistoricalrecordsofearthquakes,fieldinvestigationoftheMahubarrierlake,studyofgeologicalenvironmentfortheearthquakeandtheavailabledatathenarelocationoftheearthquakeepicenterissuggestedinthepaper.

简介：CausedbyNon-Line-Of-Sight(NLOS)propagationeffect,thenon-symmetriccontaminationofmeasuredTimeOfArrival(TOA)dataleadstohighinaccuraciesoftheconventionalTOAbasedmobilelocationtechniques.RobustpositionestimationmethodbasedonbootstrappingM-estimationandHuberestimatorareproposedtomitigatetheeffectsofNLOSpropagationonthelocationerror.SimulationresultsshowtheimprovementovertraditionalLeast-Square(LS)algorithmonlocationaccuracyunderdifferentchannelenvironments.

简介：Theclosephotogrammetric3-Dcoordinatemeasurementisanewmeasuringtechnologyinthefieldsofthecoordinatemeasurementmachine(CMM)inrecentyears.Inthismethod,weusuallyplacesometargetsonthemeasuredobjectandtakeimageoftargetstodeterminetheobjectcoordinate.Thesubpixellocationoftargetimageplaysanimportantroleinhighaccuracy3-Dcoordinatemeasuringprocedure.Inthispaper,somesubpixellocationmethodsarereviewedandsomefactorswhichaffectlocationprecisionareanalyzed.Thenweproposebilinearinterpolationcentroidalgorithm.Theexperimentshaveshownthisalgorithmcanimproveaccuracyoftargetcentroidbyincreasingavailablepixels.

简介：在这份报纸，我们与一致要求考虑差错容忍的凹面设备地点问题(FTCFL)。由调查FTCFL的结构，我们获得一个修改双试穿的bifactor近似算法。联合可伸缩和贪婪推论技术，近似因素被证明是1.52。

简介：目前，闪电是10自然灾难之一，并且它也是力量打断的最高的环境因素。它经常引起巨大的损失到电的系统。自从1980年代末，中国和科技的Huazhong大学的州的格子公司的武汉高电压研究所一直在研究并且发展中闪电地点系统(LLS)。在mid-1990s，一个闪电察觉网络在中国在29个省和城市被创造。很快发现闪电事故首先被使用，还原剂它极大地驱动打断。另外，它保证高效率和电系统的安全操作。显著利益被完成。中国的LLS通过了一“放的取向-放的时差-综合的放”开发过程。放的精确，察觉效率，自动化的学位，有实行可能和应用范围被改进。另外，国家网络的一个闪电信息系统计划被实现了，它满足整个协会。

简介：Duringthelastdecade,spatio-temporaldatabaseshavebecomeincreasinglyimportantinmanyapplicationssuchasgeographicinformationsystems(GIS)andengineeringinformationsystems.Thispaperdiscussesthedesignandimplementationofageocomputingplatformforthedevelopmentoflocation-basedservices(LBS)focusingonmobilemapping.Duringtheanalysis,design,andimplementationofthegeocomputingplatform,aneffectivemethodisproposedforthereal-timeprocessingofgeographicinformationacquiredbyacameraattachedtoapersonaldigitalassistant(PDA).Thismethodcombineslocationinformationgivenbytheglobalpositionsystem(GPS)withman’sabilitytorecognizethelocationofobjectsandtheirgeographicalrelationshiptoimproveobjectmapping.

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简介：Timeefficiencyofkeyestablishmentandupdateisoneofthemajorproblemscontributorykeymanagementsstrivetoaddress.Toachievebettertimeefficiencyinkeyestablishment,weproposeaLocation-basedHuffman(L-Huffman)scheme.First,usersareseparatedintoseveralsmallgroupstominimizecommunicationcostwhentheyaredistributedoverlargenetworks.Second,bothuser'scomputationdifferenceandmessagetransmissiondelayaretakenintoconsiderationwhenHuffmancodingisemployedtoformingtheoptimalkeytree.Third,thecombinedweightsinHuffmantreearelocatedinahigherplaceofthekeytreetoreducethevarianceoftheaveragekeygenerationtimeandminimizethelongestkeygenerationtime.SimulationsdemonstratethatL-HuffmanhasmuchbetterperformanceinwideareanetworksandisalittlebetterinlocalareanetworkthanHuffmanscheme.

简介：OriginsTheDongxiangminoritygetsitsnamefromageographicallocation.ThetermDongxiangusedtorefertothevillageseastofHezhouCity(today’sLinxiainGansuProvince).ThereignofQingEmperorKangxisawthedivisionoffourtownshipscenteredonHezhouintoeast,north,westandnorth.respectively.TheeasternpartwasthusnamedDongxiang("easternvillages").Thequestionofthisminority’soriginswasoncethesubjectofgreatdisagreement,butovertheyears,thepredominant

简介：Inthispaper,wedevotetoconstructingtheone-sidedempiricalBayes(EB)testforthelocationparameterintheGammadistributionbynonparametricmethod.Undersomemildconditions,weprovethattheEBtestisasymptoticallyoptimalwiththerateoftheorderO(n-δs/2s+1),where1/2≦δ<1ands>1isagivennaturalnumber.Anexampleisalsogiventoillustratethattheconditionsofthemaintheoremsareeasilysatisfied.

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