极值指数条件矩估计量的强弱相和性

提出了一个利用样本条件矩构造的对于极值指数的估计量,并证明了其强相和性和弱相和性.     

A new algorithm for computing the convex hull of a planar point set

When the edges of a convex polygon are traversed along one direction,the interior of the convex polygon is always on the same side of the edges. Based on this characteristic of convex polygons,a new algorithm for computing the convex hull of a simple polygon is proposed in this paper,which is then extended to a new algorithm for computing the convex hull of a planar point set. First,the extreme points of the planar point set are found,and the subsets of point candidate for vertex of the convex hull between extreme points are obtained. Then,the ordered convex hull point sequences between extreme points are constructed separately and concatenated by removing redundant extreme points to get the convex hull. The time complexity of the new planar convex hull algorithm is O(nlogh) ,which is equal to the time complexity of the best output-sensitive planar convex hull algorithms. Compared with the algorithm having the same complexity,the new algorithm is much faster.     

A taste of functional programming — 1

Functional programming has roots in Alonzo Church’s lambda calculus. A functional program is a collection of functions that work together to transform data. Though Lisp brought functional programming to public attention in the 1950s, it was John Bacus’s 1977 Turing Award lecture criticizing the limitations of imperative programming languages that led to a resurgence of of interest in this field. The 1970s and 1980s saw a number of advances, leading to the development of the language Haskell, which carefully combined ideas from many earlier languages. In this article, we explore some basic notions of functional programming via Haskell. Madhavan Mukund has been on the Computer Science faculty at Chennai Mathematical Institute since 1992, where he is currently Professor. His research interests are primarily in formal methods for specifying and verifying computing systems. He is the Secretary of the Indian Association for Research in Computing Science (IARCS) and the National Coordinator of the Indian Computing Olympiad.     

软件容错技术在低温监控系统中的应用

介绍了软件容错技术的基本原理及特点,软件容错的基本方法是恢复块RB和多版本编程NVP技术,以及实现软件容错所需的相关技术支持。在应用低温控制系统的企业,保证温控系统的正常运转非常重要,讨论了如何应用软件的容错技术有效地保证低温控制系统的可靠性。     

Java编程语言的特点与应用

NING jingyan(Datong Normal College,Datong,Shanxi,037000,China)     

BP神经网络优化算法研究

为解决BP神经网络收敛速度慢和易陷入局部极小值的缺点,利用遗传算法(GA)和基因表达式编程(GEP)的各自特点,基于BP算法提出了两种改进算法:其一是GA-BP算法,即利用GA优化BP神经网络的权值和阈值;其二是GEP-BP算法,即利用GEP对BP网络进行调整,包括网络结构、权值和阈值。用样本数据进行了测试并与基本BP算法进行了比较,结果表明两种改进算法具有很强的可行性和高效性。     

关于微积分里多元函数极值问题的研究

多元函数极值是微积分课程的一个重要概念 ,文章通过定义并结合具体实例将极值和弱极值概念作一对比 ,以说明它们的区别。同时还指出了条件极值和无条件极值在概念上及求法上的一些区别     

宇龙仿真软件在数控实训教学中的应用

以宇龙数控仿真软件为基础,研究了该软件在实际教学中的应用。对初次学习数控机床操作的学生,易出现操作过程中事故率高、机床设备等损坏大特点,并结合我校数控实训设备少,学生多的实际情况,利用数控仿真软件进行数控编程和数控仿真实训。结果表明,该方法基本上保证每个学生都能操作,解决了数控设备少的问题,提高了学生的编程能力和机床的操作能力,为学生以后真正操作数控机床打下良好的基础。     

电视娱乐节目制作中政府与市场的作用与影响

分析政府与市场在电视娱乐节目制作中所产生的不同影响,探讨电视娱乐节目制作中政府与市场的关系。提出通过电视娱乐节目的创新、转变政府的管理职能以及建立健全关于电视娱乐节目的相关法律法规,构建政府、市场及电视娱乐节目的良性互动机制。     

基于CDIO理念的《高级语言程序设计》实践教学改革措施

传统的《高级语言程序设计》实践教学模式与案例不能满足卓越工程师人才培养要求.基于CDIO教学模式的框架,文章提出了《高级语言程序设计》实践教学改革方案.该方案在泉州师范学院软件学院软件工程专业进行试点,实践结果表明,基于CDIO理念的《高级语言程序设计》实践教学改革,激发了学生学习主动性,学生的工程能力和程序设计能力有明显提高.