学科建设对期刊订购质量特征分析及应对策略

分析了学科建设对期刊信息的需求特征,提出高校图书馆要为学科建设提供全面的文献信息保障及提高期刊订购质量所采取的对策。     

Improving Collection Browsing: Small World Networking and Gray Code Ordering

Documents in digital and paper libraries may be arranged, based on their topics, in order to facilitate browsing. It may seem intuitively obvious that ordering documents by their subject should improve browsing performance; the results presented in this article suggest that ordering library materials by their Gray code values and through using links consistent with the small world model of document relationships is consistent with improving browsing performance. Below, library circulation data, including ordering with Library of Congress Classification numbers and Library of Congress Subject Headings, are used to provide information useful in generating user-centered document arrangements, as well as user-independent arrangements. Documents may be linearly arranged so they can be placed in a line by topic, such as on a library shelf, or in a list on a computer display. Crossover links, jumps between a document and another document to which it is not adjacent, can be used in library databases to allow additional paths that one might take when browsing. The improvement that is obtained with different combinations of document orderings and different crossovers is examined and applications suggested.     

一种分布函数散布序的性质

设F、G是两个分布函数，记用≤表示分布函数间的散布序，F≤G的充要条件是：-β），本文在[3]的基础上，进一步研究了这种散布序，得到一些新的结果．     

“挟天子以令诸侯”在曹操文书中的动态显示

曹操写作的公文和书信,清晰地勾勒出他挟天子以令诸侯的演进历程,折射出曹操与汉朝皇室的微妙关系。依据曹操文书,可把其挟天子以令诸侯的过程分为5个阶段:反对擅行废立,初挟天子,奉辞伐罪,为“不逊之志”辩,昭然若揭。曹操的文书是其挟天子以令诸侯军政方略的动态显示,为我们加深认识这一方略的实施提供了新的切入点。     

Systematic lossy error protection based on H.264/AVC redundant slices and flexible macroblock ordering

INTRODUCTION In typical video transmission systems, a video signal is compressed, and the resulting bit stream is transmitted over an error-prone channel. The errors may consist of symbol errors caused by fading, as observed for wireless channels, or packet erasures caused by congestion, as observed in the Internet. If a received video packet contains errors, then the portion of the video signal contained in the packet is lost and must be concealed. Error concealment schemes alone cannot …     

二元算子方程组解的存在唯一性

利用非线性泛函分析中的锥与半序理论和单调迭代技巧，讨论了几类二元算子方程组解的存在性和唯一性，构造了几种形式的对称与非对称迭代，并给出各种迭代序列收敛于算子方程组解的误差估计，是某些已有结果的本质改进和推广。     

非连续非紧二元算子方程的迭代解法及其应用

利用锥理论和耦合上下解方法,研究半序Banach空间中不具有连续性和紧性条件的非线性二元算子方程解的存在性 和唯一性,并给出迭代序列收敛速度的估计,所得结果是某些已有结果的本质改进.最后把结果成功地应用于超线性二阶常微分 方程的两点边值问题.     

Is the Item-Position Effect in Achievement Measures Induced by Increasing Item Difficulty?

This work examines the hypothesis that the arrangement of items according to increasing difficulty is the real source of what is considered the item-position effect. A confusion of the 2 effects is possible because in achievement measures the items are arranged according to their difficulty. Two item subsets of Raven’s Advanced Progressive Matrices (APM), one following the original item order, and the other one including randomly ordered items, were applied to a sample of 266 students. Confirmatory factor analysis models including representations of both the item-position effect and a possible effect due to increasing item difficulty were compared. The results provided evidence for both effects. Furthermore, they indicated a substantial relation between the item-position effects of the 2 APM subsets, whereas no relation was found for item difficulty. This indicates that the item-position effect stands on its own and is not due to increasing item difficulty.     

一种适用于实验室开放的综合管理系统

实验室开放是高校充分利用教学资源,着力培养学生实践能力及服务于社会的有效途径,已成为人们的共识。但实验室开放管理复杂、操作麻烦、工作量大,成为推进实验室开放的难点。因此,利用计算机与网络进行实验室开放管理势在必行。该文提出了一种基于校园网预约选课、门禁及设备管理于一体的开放实验室综合管理系统。     

求解多维度背包问题的一种组合排序遗传算法

提出了一种组合排序方案,并将这种排序方案应用于遗传算法．利用该排序下的遗传算法针对OR数据库中的多维度背包问题进行了求解,同时和其它类似算法进行了实验比较．