简介:讨论了一类不确定随机时滞系统的鲁棒L2-L∞滤波器设计问题。目的是对于所容许的不确定性和时滞,设计一个稳定线性滤波器,使得滤波误差动态系统是随机渐近稳定的且满足给定的L2-L∞性能要求γ。给出了解决这个问题的充分条件,并且当这些条件满足时,以参数显式化的形式给出了所求的鲁棒L2-L∞滤波器。最后用数值算例验证了结论的可行性和有效性。
简介:设L是一个模类,引人了L-内射类的概念,并用来刻画L-Noether环.推广了文[4],[5]中关于Noether环的相应结论.
简介:睁开双眼,我看到的是摇曳在空中那被风吹动的树叶。细细的呼啸声与耳膜产生共鸣,使我不禁感到一丝凉意。天气阴沉,应该是快要下雨了吧。我甩了甩脑袋,试图使自己的头脑清醒一下。长时间躺在这公园的长椅上使我感到腰酸背疼,是该起身活动活动筋骨了啊。
简介:identification and classification of learning strategy. The problems are reviewed concerning the definition and classification of learning strategies and then the paper tentatively introduces Cohen’s approach to defining learning strategies in terms of prototypicality of features of learning strategies.,Cohen’s attempt to describe the prototypicality of strategies is a step forward concerning defining learning strategies. It might reflect the nature of learning strategies to a large extent because the answers to the questionnaire come from strategy experts. It is true that some problems still exist. For example,all-or-nothing feature but in terms of how far along a continuum a feature could possibly go before it stopped being descriptive of a strategy. This is an approach of defining learning strategies in terms of how prototypical the feature was. These features as follows are arranged in a descending order of agreement