线积分的对称性原则

本文考察了线积分的对称性原则,给出了一些新的对称性结果,最后对这些结果给出了应用举例。     

两抛物线所围成的曲面面积公式及应用

通过对两抛物线所围成的曲面面积的研究,给出了两抛物线所围成的曲面面积公式,并给出了应用实例。     

网格存储技术在数字图书馆中的应用

资源存储是数字图书馆建设的重要组成部分,分析了数字图书馆资源特点及对存储的要求,指出传统存储方式的不足,并给出网格存储的概念,对网格存储的优势加以剖析,讨论其在数字图书馆资源存储中的应用,最后给出应用模型。     

EDA技术在通信原理实验中的应用

介绍了电子设计自动化（EDA）技术在高校通信原理实验中的应用,主要涉及两种常见EDA软件,SystemView和MAX＋PLUSⅡ。给出SystemView仿真实例,针对这两种软件的具体应用展开对比讨论,最终给出实际教学建议。     

数据挖掘技术在企业精准营销中的应用研究

本文给出了一个数据挖掘的系统实现方案,并给出应用的案例.在此方案的基础上.可以为企业精准营销提供决策支持.     

基于XML的关系型数据交换研究与设计

文章对关系型数据交换的理论研究,给出了模块化思想,提出了关系模式与XML模式转换的模型。最后,结合实际给出了关系型数据交换的具体应用。     

人脸特征检测的最佳Gabor滤波器设计方法

Gabor小波滤波器的应用可以转化为在不同的问题中如何合理选取Gabor滤波器参数的问题,不同的应用场合参数选取的依据应有所不同。本文通过实验给出了Gabor滤波器在人脸特征检测方法中参数的选择依据并给出具体的参数。     

Struts在电子报价系统中的应用

介绍了Struts框架的基本概念,分析了电子报价系统的功能需求,结合其中一个功能模块给出了应用Struts框架实现的方法,并给出了具体的类图。     

防空导弹定向战斗部

阐述了定向战斗部概念,国展定向战斗部的应用。从理论上详细计算了定向战斗部的各个参数,在理论计算的基础上,给出了一个样机方案。就此方案,做了地面静爆试验,并给出了一些结论,这些结论可以应用到相关类型的战斗部方案设计中。     

信息系统通用用户安全管理设计与实现

在中大型信息系统中都要进行用户管理以及用户权限管理,本文将给出设计通用用户安全管理设计思路,并给出设计成功的关键流程及应用实例。     

基于企业竞争战略的企业性质研究

基于企业竞争战略的企业性质研究目前有三种代表性的观点第一,企业是价值活动的集合体;第二,企业是核心能力的集合体;第三,企业是战略资源的集合体。本文认为,企业是顾客需求的集合体,顾客是企业持续竞争优势的来源。     

An improved lock detector for phase-locked communication receivers

A quadrature lock detector is incorporated in almost all coherent radio communication receivers. This commonly-used receiver subsystem is comprised of a quadrature phase detector that drives a low-pass filter, the output of which is subjected to a user-specified threshold to make a lock/unlock decision. Signal acquisition and phase lock are declared if an above threshold condition is observed. Unfortunately, this method of lock detection may yield a positive lock indication when the receiver is false locked; i.e., a classical quadrature lock detector may generate a false-positive lock indication. This tendency to produce an incorrect lock indication can be reduced significantly by using the new lock detector algorithm that is described here. Compared to the classical quadrature lock detector, the new lock detector is better able to differentiate between true phase lock and anomalous false lock. The classical quadrature lock detector is a simple, first-order approximation of the new lock detector algorithm. That is, the new lock detector algorithm consists of a classical quadrature detector that is augmented by a correction term.     

Uncertainty and the inconvenient facts of diagnosis

One common contemporary usage of the term “diagnostic uncertainty” is to refer to cases for which a diagnosis is not, or cannot, be applied to the presenting case. This is a paradoxical usage, as the absence of diagnosis is often as close to a certainty as can be a human judgement. What makes this sociologically interesting is that it represents an “epistemic defence,” or a means of accounting for a failure of medicine’s explanatory system. This system is based on diagnosis, or the classification of individual complaints into recognizable diagnostic categories. Diagnosis is pivotal to medicine’s epistemic setting, for it purports to explain illness via diagnosis, and yet is not always able to do so. This essay reviews this paradoxical use, and juxtaposes it to historical explanations for non-diagnosable illnesses. It demonstrates how representing non-diagnosis as uncertainty protects the epistemic setting by positioning the failure to locate a diagnosis in the individual, rather than in the medical paradigm.     

Projects as communicating systems: Creating a culture of innovation and performance

Although often downplayed and instrumental, there is evidence that communication in projects is essential in achieving value creation. Our main interest in this paper is on temporary continuity, a situation where the temporary becomes a permanent condition in social systems. The question that we have address is: What characterizes project communication in a situation with temporary continuity?We argue for the need to transform communication processes into communication capabilities. In a situation with temporary continuity, there is a need to connect to a large number of value-creating processes, and communicating capabilities need to be a part of a communication system, where the aim is to bind together value-creating processes and communication capabilities. We construct a viable system consisting of five sub-systems. To become a viable system, projects in the form of temporary continuity, must handle the potential conflict between a culture of performance and a culture of innovation. This involves developing social mechanisms for coordination and interaction, with a focus on developing communication capabilities, in parallel with focusing on all of the five value-creation processes.     

基于点处理的图像脉冲噪声滤除方法研究

在分析含噪图像恢复方法和脉冲噪声概率密度函数的基础上,提出了一种基于点处理理论的脉;中噪声污染图像的恢复算法。该算法依次扫描图像的像素点,判断当前的像素点是否为脉冲噪声数据点,如果为噪声点,则计算空域滤波器的输出结果,并替代该像素点的值;否则,该像素点的值保持不变。实验结果表明,该方法基于像素点的空域处理,具有无排序操作、算法执行速度快和保持图像细节的优点。     

Natural surface design for sliding mode control with multiple discontinuous inputs

It is well known that sliding mode control is based on the definition of an invariant manifold, where the system dynamics are forced to in a finite time. Such a manifold is somewhat arbitrarily defined, as long as the system dynamics are stable on it. Computational and control effort may vary depending on selected manifold. Obviously, if a system has naturally acceptable stable dynamics around a desired equilibrium point, no control is needed unless uncertainties or disturbances are present. It would be desirable that if such a system had uncertainties or disturbances, the control effort be designed only to overcome the effect of such factors. For a system with first order dynamics and affine control input, designing a sliding mode control overcoming only such uncertainties or disturbances is a trivial task. When a higher order dynamics system is involved, unit control may be used, where the input control signals are not discontinuous, but when only discontinuous control inputs are available, a design approach is not readily available. In this paper, taking advantage of the natural stable dynamics of a system, a sliding mode control approach is introduced for designing multiple discontinuous control inputs, where the control effort overcomes only uncertainties, disturbances or unstable dynamics. Two illustrative examples are given in order to show the feasibility of the method.     

风险企业控制权安排的博弈分析

控制权安排是风险企业所有权结构的中心特征。在风险资本融资时,存在信息不对称和逆向选择问题。创业家向风险资本家转移的控制权是显示其类型的信号,这是一个不完全信息动态博弈问题。拥有控制权的风险资本家会根据事后的信息决定是否对风险企业进行干预。对好创业家来说,成本是很低的;对坏创业家而言,是很大的威胁,从而使好创业家得到融资的同时,减少了坏创业家进行融资的可能性。如果双方事前信息不对称程度较低或者事后风险资本家得到的信息质量较高,相机控制权安排是最优的;反之,风险资本家应该得到全部控制权。     

我的课堂我做主——语文课走出“教学教科书”的时代

语文课是充满生机和活力的课堂。语文课往往并不呈现出一种静态的知识体系,而是与师生一起处于一种变动的关系之中。语文课是预设与生成的统一。一节好的语文课应该更重视生成。叶圣陶先生说：＂语文教本只是些例子。＂这就对语文教师提出了更高的要求,它要求教师不仅是语文教科书的执行者,也应该是教科书的改造者、创新者。对于课堂的主人——学生来说,教科书也仅仅是有待激活的原声材料,它要在教师的引领和学生的理解中生成符合学生认知规律的知识。只有通过师生的感悟、体验、理解,教科书才能发挥它内在的精神意蕴和包含的文化精神。     

洛特卡参数的新估计法

洛特卡定律是文献计量学的重要理论基础,是文献计量学的三大定律之一。借助它人们可以了解作者发文的结构。广义洛特卡定律是含约束条件的模型,它的参数估计较为复杂,帕欧提出了近似估计法,但其法仍较为复杂,且参数估计方法不科学。为了科学地估计参数本文在帕欧估计结果的基础上,通过回归法给出了更为简单、更为科学的估计法。     

钱学森科学学思想的认识论意义

钱学森不仅是我国一位伟大的科学家,同时也是一位杰出的思想家。他的科学成就涉及很多领域,他的科学思想内容丰富,学术见解深刻新颖,是近一个世纪以来我国一位不可多得的科学天才。科学学思想是其博大思想体系的重要组成部分,其学术影响是深远的。钱学森是我国科学学学科建设的倡导者,其科学学思想在一定程度上丰富了认识的主体和客体,深化了认识的辩证过程,并进一步加深了人们对实践内涵的理解,具有较高的认识论意义。