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LOCAL INFLUENCE ASSESSMENT IN A MULTIVARIATE t-MODEL WITH RAO'S SIMPLE STRUCTURE 被引量:3
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作者 邹清明 张怀雄 《Acta Mathematica Scientia》 SCIE CSCD 2005年第1期179-192,共14页
The local influence analysis is an important problem in statistical inference and some models have been discussed in many literatures This paper deals with the problem of assessing local influences in a multivariate t... The local influence analysis is an important problem in statistical inference and some models have been discussed in many literatures This paper deals with the problem of assessing local influences in a multivariate t-model with Rao's simple struc-ture(RSS). Based on Cook's likelihood displacement, the effects of some minor perturbation on the statistical inference is assessed. As an application, a common covariance-weighted perturbation is thoroughly discussed. 展开更多
关键词 Multivariate t-model Rao's simple structure ω-model likelihood displacement MLE
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Waveguide Prism Based on Porous Silicon 被引量:1
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作者 JIAZhen-hong 《Semiconductor Photonics and Technology》 CAS 2004年第1期28-30,共3页
The fabrication of the oxidized porous silicon waveguide prism is reported by selectively electrochemical anodisation process. The direction changes of light beams in TE and TM polarization out of this waveguide prism... The fabrication of the oxidized porous silicon waveguide prism is reported by selectively electrochemical anodisation process. The direction changes of light beams in TE and TM polarization out of this waveguide prism were respectively measured,and the experimental results were analyzed. 展开更多
关键词 Porous silicon WAVEGUIDE PRISM
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Realization of Tapered Waveguide by Stretching the Rod Waveguide
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作者 XIAKe-yu YURong-jin MENGHua-mao 《Semiconductor Photonics and Technology》 CAS 2004年第2期82-85,共4页
By stretching the rod waveguide with different velocities in opposite directions,the tapered waveguide can be fabricated.In condition of taking no account of volume expansion caused by heating and under the assumption... By stretching the rod waveguide with different velocities in opposite directions,the tapered waveguide can be fabricated.In condition of taking no account of volume expansion caused by heating and under the assumptions of volume conservation,the rod waveguide can be stretched freely in the heated region without being stretched outside of the heated region. A model,which shows the relation of the transition shape and the two factors,that is the ratio of two velocity and the heated region length,is presented for the shape of the taper transition through mathematic deduction.Based on this model,a desired tapered waveguide can be fabricated.The tapered waveguide are widely used for fabricating tapered fiber couplers and sensors.In addition,the conclusion can be used for fabricating fused fiber coupler. 展开更多
关键词 Optical fiber coupler Tapered waveguide MODEL
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