梯形水平折梁的内力分析

本文对梯形水平折梁（０≤α＜∏２）和矩形水平折架（α＝∏２）用最小余能原理进行了内力分析，并导出了相应的计算公式，可在工程结构设计中采用     

How to Build Robust Shared Control Systems

Previous researchers have designed shared control schemes with a view to minimising the likelihood that participants will conspire to perform an unauthorised act. But, human nature being what it is, systems inevitably fail; so shared control schemes should also be designed so that the police can identify conspirators after the fact. This requirement leads us to search for schemes with sparse access structures. We show how this can be done using ideas from coding theory. In particular, secret sharing schemes based on geometric codes whose dual [n,k,d] codes have d and n as their only nonzero weights are suitable. We determine their access structures and analyse their properties. We have found almost all of them, and established some relations among codes, designs and secret-sharing schemes.     

MIS新思维软件工具的设计与实现

本文针对目前陈旧的管理软件的设计方法提出了一种新的观点,同时探讨了为实现这种新观点而研制的软件工具的设计方法和实现技巧。     

浅析营业杠杆系数及其经济应用

本文介绍了营业杠杆系数这一衡量企业经营风险的重要指标，对该指标的特性进行了较深入的分析和探讨。同时，还导出了利用该指标判断企业经营安全状态的方法。     

多目标多阶段决策问题最优化方法及应用

本文提出了可行状态点,可行边和可行策略等概念,建立了一种新的解决多目标多阶段决策问题的方法,介绍了这一方法的应用实例:     

Szász-Mirakyan算子对不连续函数的逼近研究

研究用szász-Mirakyan算子S_n(f, x)逼近在(0,+∞)上具有第一类间断点的有界函数了,给出了收敛速度的估计。     

关于职校生期刊的办刊特色研究

职校生期刊是随着我国经济建设和职教事业飞速发展而崛起的一支传媒新军。文稿就期刊的办刊方针、刊载内容、版式设计以及服务意识作了探索,凸现了期刊为职校生读者群服务的个性特色。     

Basic Properties of the (t, n)-Threshold Visual Secret Sharing Scheme with Perfect Reconstruction of Black Pixels

In this paper we consider the (t, n)-threshold visual secret sharing scheme (VSSS) in which black pixels in a secret black-white images is reproduced perfectly as black pixels when we stack arbitrary t shares. This paper provides a new characterization of the (t, n)-threshold visual secret sharing scheme with such a property (hereafter, we call such a VSSS the (t, n)-PBVSSS for short). We use an algebraic method to characterize basis matrices of the (t, n)-PBVSSS in a certain class of matrices. We show that the set of all homogeneous polynomials each element of which yields basis matrices of the (t, n)-PBVSSS becomes a set of lattice points in an (n−t+1)-dimensional linear space. In addition, we prove that the optimal basis matrices in the sense of maximizing the relative difference among all the basis matrices in the class coincides with the basis matrices given by Blundo, Bonis and De Santis [3] for all n≥ t ≥ 2.     

一类二阶三点边值问题单调正解的存在性

利用范数形式的锥上不动点定理,研究了一类二阶微分方程三点边值问题单调正解的存在性．分别给出了齐次和非齐次边界条件下的三点边值问题单调正解存在的充分条件,确定了解曲线的凹凸性,并且给出了一个应用实例．