A Modified Extended Bayesian Method for Parameter Estimation

This paper presents a modified extended Bayesian method for parameter estimation. In this method the mean value of the a priori estimation is taken from the values of the estimated parameters in the previous iteration step. In this way, the parameter covariance matrix can be automatically updated during the estimation procedure, thereby avoiding the selection of an empirical parameter. Because the extended Bayesian method can be regarded as a Tikhonov regularization, this new method is more stable than both the least-squares method and the maximum likelihood method. The validity of the proposed method is illustrated by two examples: one based on simulated data and one based on real engineering data.     

潮滩剖面形态特征及演变

 总结了国内外对潮滩剖面形态和演变研究上取得的进展,以全球最典型、潮滩资源最丰富的江苏为研究对象,分析了潮滩观测量测方法、潮滩剖面形态及沉积过程,潮滩演变特征及其物质和动力响应等,并讨论了潮滩发育与演变的主要影响因素。     

正常BMI人群腹型肥胖与血脂代谢

探讨2型糖尿病和正常糖代谢者中正常BMI腹型肥胖患者血脂代谢水平。方法：对体重指数（BMI）〈24kg／m^2的130例2型糖尿病和正常糖代谢组分为腹型肥胖及非腹型肥胖两个亚组。测定各血脂指标。结果：1.T2DM组与NGT组同：A组TG显著高于C组;B组HDL-C显著低于D组。2.亚组间：在T2DM组中,A组TG、TC及LDL-C均显著高于B组。在NGT组中,C组TG和LDL-C显著高于D组,C组HDL-C显著低于D组。经协方差校正BMI后,TC在A组与B组之间及LDL-C在C组与D组之间比较仍有显著差异。3.相关性分析：腰围与体重指数与血脂各指标均具有显著相关性,且腰围的相关系数γ值均大于体重指数。结论：即使BMI正常,腹型肥胖者血脂指标仍与腰围相关联。