内部排序算法的性能分析与探讨

文章论述了算法的评价因素,通过设计随机乱序算法程序,针对各种长度的可排序表,采用不同的测试组数,测试了6种常用的内部排序算法的关键字比较次数和移动次数,从时间复杂度方面给出了6种排序算法的优劣.     

正则图同构判定的一个充要条件

给出了正则图同构判定的一个新充要条件,该条件对近似正则图同构判定也是有效的。     

基于大数因式分解的一种数字签名方案

本文利用大数因式分解的困难性提出不同于RSA公钥密码体制一种数字签名方案,并讨论了该方案的安全性。     

48 million configurations and counting: platform numbers and their capitalization

Platforms are important actors in contemporary cultural economic processes. They include social network sites, online content management systems, streaming media platforms, mobile communication infrastructures, supply chain logistics solutions, and cryptocurrencies. Analysis of platforms and their capitalization should take into account the ways they structure social practice as assets and the constitutive opacity of platforms as configured realities. It explores capitalization by focusing on the problems of counting people and things on platforms. Via a case study of the software repository platform [Github.com] (https://github.com), it analyzes how 'platform numbers’ participate in capitalization. It describes attempts to enumerate the elements of the platform by counting, mapping or listing them. The paper shows how attempts to enumerate people and things encounter forms of association, duplication, combination, imitation and configuration that are crucial to the ensemble but remain refractory to capitalization. It proposes configurative enumeration of the platform numbers as a way of conceptualizing these un-enacted excesses. In a configurative enumeration, the composition, the rhythms of imitation, variation and commutation, and constant relating, repairing and adjusting of configurations crucial to the ongoing formation of platforms come into view. Configurative enumerations engage the inventive realities of platformization, realities that precede and sometimes overflow their capitalization.     

在VFP环境下实现随机编号的一种实用方法

主要介绍了在设计开发"三明市中职招生管理系统"过程中,学生准考证号随机生成的一种实用方法。     

二部图全新充要条件探讨

对二部图从独立数的角度进行了深入的分析,从而得到了二部图判定的一个全新的充要条件:图G是二部图的充要条件是 H G,α(H) 12|V(H) |.     

古代神秘数字观念与《诗品》品评结构模式

由于钟嵘在《诗品》中精心选设了古代“三”、“十二”、“三十九”、“七十二”等一组神秘数字序列 ,并以其作为构成自己诗学思想体系内在基本的结构素 ,划分诗人品第 ,确定“三品”诗人群体数量 ,从而构筑了《诗品》的品评结构模式 ,透示出“照烛三才 ,辉丽万有”的诗学本体论追求和古代哲学“天人合一”的终极价值意向。《诗品》也成为中国古典诗学史上极富整体性和序列性的经典之作     

氯代聚并苯同系分子的能量和电子极化率与同系序数的相关性研究

氯代聚并苯同系物的能量和电子极化率与同系序数之间满足下列相关方程E=a Nβ+b,　　　　　　　　　R≈ lα(或 απ ) =α′ Nβ′+b′,R≥ 0 .9990απ/ α(% ) =α″Nβ″+b″,R≥ 0 .9999N=2 n+1,为同系序数 ,n为苯环的结构单元数 β、β′、β″随同系分子的类型而变 ,本文的计算值与文献值吻合良好     

Do gestures matter? The implications of using touchscreen devices in mathematics instruction

Touchscreen devices are increasingly used in education and are a predominant tool for everyday knowledge search. An assumption about the nature of touchscreen devices is that users intuitively understand them, which improves access to knowledge. Using a framework that includes concepts from cognitive psychology, information studies, and communication theory we explored whether users' physical interactions on a touchscreen device have consequences for their conceptual understanding of content – in this case mathematics. In the present study, adults (n = 40) completed a number line estimation task on a tablet computer (on the line 1|--------|10, place a mark at 7) by either touching the screen in a singular location (tap) or by dragging their finger across the line to the desired location (drag). All participants then went on to use the drag gesture to complete two more tablet computer mathematics tasks assessing understanding of the continuous nature of numbers. Participants in the drag condition were more accurate on all three tasks, suggesting that the continuous nature of the gesture reinforced their continuous understanding of numbers. Gestures may influence understanding of content learned from a touchscreen.     

一种未知信源数目的声矢量阵DOA估计算法

针对声矢量DOA估计问题,根据声矢量阵的特点,结合MVDR算法的思想,本文提出了一种声矢量阵DOA估计新算法。该算法将声矢量阵振速通道的数据协方差矩阵相加得到新的协方差矩阵,然后结合声矢量阵声压通道的数据协方差矩阵,通过类似于V-MVDR算法的角度扫描过程实现目标的DOA估计,该算法无需已知信源数目且不需要特征值分解运算,具有良好的DOA方位估计和分辨性能,计算机仿真结果验证了本文算法的有效性。