ADSL技术及其应用

ADSL采用点对点拓扑结构,其双向速率的不对称性,非常适合互联网浏览业务“下栽多,上传少”的应用特点,是当前电信运营商为适应宽带接入市场竞争所采取的主要对策。介绍ADSL技术特点、技术原理及其应用。     

The GPI-anchor and protein sorting

Glycosylphosphatidylinositol (GPI)-anchored proteins (GPI-APs) are a diverse class of proteins that are anchored to the membrane solely via means of a posttranslational lipid modification, the GPI-moiety. Since their discovery in the late 1970s, years of research have provided significant insight into the functions of this ubiquitous modification. In addition to the structure and biosynthesis of the GPI-moiety, perhaps the best-studied feature of this glycolipid is its ability to impart characteristic membrane-trafficking properties to the proteins that it anchors. Study of the mechanism of sorting of GPI-APs has brought to light the importance of lateral heterogeneities in cell membranes, termed rafts, in biological sorting processes. The focus of this review is to examine the emerging role of the GPI-anchor and mechanisms involved in GPI-AP sorting in the context of intracellular trafficking pathways.     

一种基于排序的旅行售货员问题算法(Ⅲ)──实例计算分析

继本题第一和第二部份，通过若干个实例来说明本算法的求解过程；并用随机数来模拟TSP中每两个城市之间的不同路径，对算法作进一步的讨论。运算结果表明：对于本算法，本题第二部份所确定的TSP路线方案搜索范围是合理的。     

加权排序法

在分析常用平均值方法排序的片面性基础上，提出了一种基干线性加权技术的加权排序方法，设计了完整的加权排序流程图和主程序，并给出了一些计算实例．     

B样条曲面的求值和节点插入算法研究

通过研究二阶常系数微分算子的零空间及其初值问题解的唯一性,引入了广义B样条曲线的概念,给出了B样条曲线的一种统一表示形式,介绍了其求值算法及节点插入算法,并以多项式B样条为例,将样条曲线的求值算法和节点插入算法推广到曲面.数值实验表明,求值算法和节点插入算法对样条曲线和样条曲面均准确、有效.     

Involvement of a cytoplasmic glyceraldehyde-3- phosphate dehydrogenase GapC-2 in low-phosphate- induced anthocyanin accumulation in Arabidopsis

Phosphorous is one of the essential mineral elements for plant growth and development.Typically, the shoots of plant seedlings usually turn a dark-brown or purple colour under low-Pi stress. Using protein 2-D gel and peptide mass fingerprinting mapping (PMF) methods, a cytoplasmic glyceralde-hyde-3-phosphate dehydrogenase GapC-2 was identified as a low-Pi responsive protein in Arabidopsisplants. Expression of AtGapC-2 protein was significantly decreased after 4 d of low-Pi stress. Two in-dependent T-DNA insertion lines of GapC-2 gene (At1g13440) showed a hypersensitive phenotype inresponse to low-Pi stress compared with wild type plants, while the transgenic complementation linesof the mutants showed a similar phenotype to the wild type. These results indicate that AtGapC-2 mayplay an important role in Arabidopsis responses to low-Pi stress, possibly by regulation of glycoly-sis-associated "Pi-pool" and accumulation of anthocyanin pigments in plants.     

线性递归并行排序算法

应用左递归二叉树构造一个新的并行排序算法,对ｐ个有序块进行排序．从而,将ｎ元素的分类问题转化为对ｐ个有序块的并行排序问题．算法在最坏情况下并行步为Ｏ（（ｎ／ｐ）ｌｏｇｎ／ｐ）,是目前比较好的排序算法．     

教育大数据下基于离群检测的教学预警模型

针对在线教学过程中教学方案缺乏针对性、教学效果评估和反馈缺乏时效性的问题,在量化数据与相似度排序的基础上提出基于学习过程和学习成绩的分析算法,通过规则检测与离群检测建立了交互式教学系统中的预警模型,实现了基于学习行为分析的自动干预和主动干预。预警信息可视化结果表明,参与交互的各方均能够直观、高效地获取预警信息,对学习效果和学习成功率的提升起到了促进作用。