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The adaptive stabilization problem of nonlinear systems are studied. For a class of uncertain nonlinear systems with unknown control direction, we proposed a robust adaptive backstepping scheme withσ-modification by introducing Nussbaum function and Backstep- ping methods, and proved that all the signals of the closed-loop systems are bounded. 相似文献
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郑兆顺 《数学的实践与认识》2008,38(9):141-146
提出一种在多光源下多幅图像来恢复有高光和阴影物体三维表面的方法.对有高光和阴影图片恢复物体的三维表面,物体表面可以认为是L am bertian模型加上高光阴影区域的混合模型. 相似文献
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不定方程组{11x~2-9y~2=2,40y~2-11z~2=29}的正整数解的上界 总被引:1,自引:0,他引:1
郑兆顺 《数学的实践与认识》2008,38(11)
运用Baker方法得到了不定方程组{11x~2-9y~2=2,40y~2-11z~2=29}的正整数解的上界.上界为(x,y,z)=(0.9×2118406,2118406,0.52×2118406). 相似文献
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§0. IntroductionInthepaper[1],KieferandWolfowitzsolvedtheequivalenceofG-optimaldesignandD-optimaldesign.Inthepaper[2],KailinandStuddenstudiedthealgebraicstructuoeofconces-sionaldesign,D-optimalandC-optimaldesign.Inthepaper[3],SpruillstudiedtheC-optim… 相似文献
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