最大面积避障矩形问题的解法

建立了在一个含有若干障碍点的矩形母域内求一个最大面积避障矩形问题的数学模型.通过分析避障矩形的几何特性,找到了求解这一含有0-1变量的非线性规划数学模型的一种特殊解法.     

新型角速率火控系统研究

根据激光测距仪获得的目标斜距,建立实时确定目标速度和过航斜距的数学模型,并提出解决角速率火控系统中普遍存在的计算延迟、预测精度不高和弹道气象修正困难等问题的方案。     

The knapsack problem with a minimum filling constraint

We study a knapsack problem with an additional minimum filling constraint, such that the total weight of selected items cannot be less than a given threshold. The problem has several applications in shipping, e‐commerce, and transportation service procurement. When the threshold equals the knapsack capacity, even finding a feasible solution to the problem is NP‐hard. Therefore, we consider the case when the ratio α of threshold to capacity is less than 1. For this case, we develop an approximation scheme that returns a feasible solution with a total profit not less than (1 ‐ ε) times the total profit of an optimal solution for any ε > 0, and with a running time polynomial in the number of items, 1/ε, and 1/(1‐α). © 2012 Wiley Periodicals, Inc. Naval Research Logistics, 2013     

Bounded flexibility in days‐on and days‐off scheduling

This article presents a flexible days‐on and days‐off scheduling problem and develops an exact branch and price (B&P) algorithm to find solutions. The main objective is to minimize the size of the total workforce required to cover time‐varying demand over a planning horizon that may extend up to 12 weeks. A new aspect of the problem is the general restriction that the number of consecutive days on and the number of consecutive days off must each fall within a predefined range. Moreover, the total assignment of working days in the planning horizon cannot exceed some maximum value. In the B&P framework, the master problem is stated as a set covering‐type problem whose columns are generated iteratively by solving one of three different subproblems. The first is an implicit model, the second is a resource constrained shortest path problem, and the third is a dynamic program. Computational experiments using both real‐word and randomly generated data show that workforce reductions up to 66% are possible with highly flexible days‐on and days‐off patterns. When evaluating the performance of the three subproblems, it was found that each yielded equivalent solutions but the dynamic program proved to be significantly more efficient. © 2013 Wiley Periodicals, Inc. Naval Research Logistics 60: 678–701, 2013     

非医学类专业大学生急救普及状况调查及影响因素分析

目的通过对我院非医学娄大学生急救知识掌握程度以及知识来源的调查,探讨对非医学类大学生急救能力普及的教育、教学方法。方法对我院非医学类大学生采用院外急救知识及技能认知凋查表进行问卷调查。结果2％的大学生认为自己没必要学习这门课程,42％的大学生对于这些涉及生命的知识学习意识较高,但对急救知识、急救能力的掌握程度看所有被调查学生认知率不尽如人意;其急救知识的获得来源多为电视、报刊杂志、科教书以及网络等。结论普及非医学类大学生急救知识势在必行,应加大改进教学方法以及教育力度。     

高级程序设计语言综述

为读者选择语言提供了总体思路,给出了高级语言的发展的趋势。     

汉语语境下教师对学生冲突性话语的回应策略与面子的语用分析

师生间的言语冲突在课堂教学中时有发生,而这一现象并未引起足够重视。课堂教学中师生间冲突性话语为本文的研究对象,分析其语言表现,并依据Brown&Levinson的面子威胁论,探析教师对于学生不合作话语引发的冲突回应,旨在揭示师生间冲突性话语的面子威胁性特征及语用理据。     

案例教学法在学前教育学课程教学中的运用

学前教育学课程是学前教育专业学生系统学习本专业知识的认知起点,在教学中运用案例教学法能弥补学生对本专业的感性认知和实践经验的缺乏,对于教师的"教"、学生的"学"和师生之间、生生之间的互动都有十分重要而有益的价值。本文诠释了案例教学法的基本内涵,在此基础上论述了案例教学法在学前教育学课程教学中的重要价值,最后探讨了在学前教育学课程教学中案例教学法的实施过程和应当注意的问题。     

激励视角下幼儿教师频繁流动的问题与对策

频繁流动已成为当代幼儿教师队伍建设中一个值得研究的课题。本研究借助对不同类型流动幼儿教师的访谈,揭示了激励机制与幼儿教师流动之间的关系,并在激励视角下,针对幼儿教师的频繁流动问题提出了相应的解决策略,以确保幼儿教师队伍建设的稳定性。