基于主动学习的资源优化分配方案研究

从实际应用的角度阐述分析了主动学习算法在资源优化分配中的应用问题,首先分析了主动学习的发展问题,并给出了主动学习的数学描述,在此基础上,重点以学生分班为例阐述了主动学习算法的应用问题。     

Molecular mechanisms of phagocytic uptake in mammalian cells

Phagocytosis is a highly conserved, complex process that has evolved to counter the constant threat posed by pathogens, effete cells and debris. Classically defined as a mechanism for internalising and destroying particles greater than 0.5 mum in size, it is a receptor-mediated, actin-driven process. The best-studied phagocytic receptors are the opsono-receptors, FcgammaR and CR3. Phagocytic uptake involves actin dynamics including polymerisation, bundling, contraction, severing and depolymerisation of actin filaments. Recent evidence points to the importance of membrane remodelling during phagocytosis, both in terms of changes in lipid composition and delivery of new membrane to the sites of particle binding. Here we review the molecular mechanisms of phagocytic uptake and some of the strategies developed by microbial pathogens to manipulate this process.     

Dynamic Latent Class Model Averaging for Online Prediction

We consider the problem of online prediction when it is uncertain what the best prediction model to use is. We develop a method called dynamic latent class model averaging, which combines a state‐space model for the parameters of each of the candidate models of the system with a Markov chain model for the best model. We propose a polychotomous regression model for the transition weights to assume that the probability of a change in time depends on the past through the values of the most recent time periods and spatial correlation among the regions. The evolution of the parameters in each submodel is defined by exponential forgetting. This structure allows the ‘correct’ model to vary over both time and regions. In contrast to existing methods, the proposed model naturally incorporates clustering and prediction analysis in a single unified framework. We develop an efficient Gibbs algorithm for computation, and we demonstrate the value of our framework on simulated experiments and on a real‐world problem: forecasting IBM's corporate revenue. Copyright © 2014 John Wiley & Sons, Ltd.     

Serial nuclear transfer improves the development of interspecies reconstructed giant panda (Aluropoda melanoleuca) embryos

Interspecies somatic nuclear transfer (NT) may provide a new approach for preservation of the endangered rare species. Previous interspecies cloning studies have shown that a nucleus from a quiescent somatic cell supports early development of reconstructed embryos in the ooplasm from another species. In this study, we transferred nonquiescent somatic cells from a giant panda into the perivitelline space of the enucleated rabbit oocytes. After electrofusion (at the rate of 71.6%) and electrical activation, 4.2% of the panda-rabbit reconstructed embryos developed to blastocyst in vitro. For improving the development rate of reconstructed embryos, we used serial NT in this study, i.e. blastomeres from reconstructed morulae were transferred into the perivitelline space of the enucleated rabbit oocytes. The fusion rates in the groups of serial I, serial II and serial III were 79.5%, 84.1% and 78.0%, respectively, having no difference with that of somatic group. And the blastocyst rates in serial NT groups were 19.4%, 13.5% and 10.3%, respectively, which are significantly higher than that in somatic NT group. These results indicate that the nuclei from nonquiescent somatic cells can support early development of reconstructed embryos and serial NT can improve the development rate of interspecies reconstructed embryos. These authors contributed equally to this work.     

RELIABILITY BOUNDS IN NWUE CLASS WITH KNOWN MEAN AND VARIANCE

Let. F∈NWUE with known mean and variance. In this note a simple sharplower bound of F=1-F(t) is given.     

平面上定义的两类函数之间的关系

为研究平面上以正六边形为基本集的周期函数的性质,定义了在平面上以矩形为基本集的半交错周期函数概念,并讨论了这2类函数之间的一些相互关系.由此可以揭示这2类函数的Fourier级数理论的一些联系.顺便给出一个关于Jackson不等式的精确结果.     

建构“四维一体”的高职院校班级管理模式

新形势下,高职院校班级管理面临着新的挑战,为迎接新挑战、提升班级管理的质量与效益,有必要在班级管理实践中采用一种“四维一体”班级对话管理模式,并进一步就“四维一体”班级对话管理模式建构的背景、理论基础、基本样式、保障条件等方面进行了分析。     

剩余类环Z_M与Z_M上的数论变换

剩余ZM类环是一类特殊的环.数论变换是以正整数M为模的正整数环(域)ZM上定义的线性正交变换.所用的计算方法是数论中的同余运算.介绍了剩余类环ZM上的几个方面的知识点,以及ZM上的数论变换的有关理论,及其数论变换应注意的几个问题.     

“数字图像处理”教学软件的开发设计

为了配合＂数字图像处理＂课程的课堂教学和实践教学,提出了一套集理论教学与实验教学于一体的软件平台设计方法,介绍了开发工具的选择,软件框架结构,图像文件打开、处理及显示等功能.实践证明：该平台能够有效改善教学效果,提高学生在图像处理方面的软件编程素质和实践应用能力,达到理论与实践相结合的教学目标.     

剩余类环上线性方程组的求解

利用同余理论给出剩余类环Zm（m=p1α1p2α2…pkαk）上线性方程组的求解方法.对剩余类环Zm（m=p1α1p2α2…pkαk）上线性方程组是否有解给出判定定理.