Linear Programming图解法建模研讨

对仅有两个变量的Linear Programming,通过图解法求最优解。建立了数学模型并求得了最优解。从图解法可以直观地看出,仅有两个变量的Linear Programming的解有唯一最优解、无穷多个最优解、无界解和无可行解四种情况．若其有最优解,则必定会在其顶点上得到;若在多个顶点上得到最优解,则其有无穷多个最优解。     

如何实现职业技术学校管理最优化

一、发挥最优管理的诸项职能。为实现“最优化”必须以学校工作的最优目标为方向,对学校这一系统工程做出最优计划,设置最优机构,组织最优教学,实施最优控制。其过程如下: 第一,编制最优发展规划规划是一个预测未来,认定目标、决定措施、选择方案的连续过程。制定既切     

供应链中断情形的最优订购模型

本文建立了由一个供应商和两个零售商组成的供应链在中断情形下的最优订购模型,从随机需求出发,在集中式决策和分散式决策下分别讨论了零售商的最优订购问题及供应商的最优定价问题,得到了零售商的最优订购量,给出了供应商的最优批发价格.     

随机波动率模型的最优投资问题

研究了随机波动率模型的最优投资问题。通过对数变换将最优问题的HJB方程转化为半线性偏微分方程,证明了最优投资组合解的存在性,给出了价值函数和最优投资策略。     

O-U过程的最优投资

研究了O-U过程的最优投资问题,得到了最优投资策略和最优投资的价值函数的显示解。     

(SLP)全体最优解的解析表达问题

本文通过对最优解集无界,但仅具有唯一最优基本可行解的(SLP)的最优解的讨论,进一步探讨了一般(SLP)全体最优解的解析表达问题,给出了相应的结果及其证明。     

基于遗传算法的GIS辅助最优路径查找方法

当前的GIS最优路径查找搜索策略是启发式算法。由于缺乏可行解空间的全局采样,这些算法多数情况下容易陷入局部最优。作者提出一个基于遗传算法的最优路径方法且成功地应用于最优路径的查找。     

用数学建模思维解决企业的营销问题

应用求多元函数的极值方法解决企业的营销问题,并得到最优方案。分步录取最优,即是把一个复杂的多阶段最优决策问题化为多个单阶段最优决策问题。应用多项式插值拟合将成本、销售额、经费、计划外概率、计划外利润、宣传费与物品个数的关系表示成函数关系式,经分析后,将公司及销售部的利润用函数关系式列出后是非线性规划问题,列出约束条件,求出最优解和最优值。     

线性规划中的整点最优解

线性规划在实际问题中有着广泛的应用．若能把实际问题转化成线性规划问题，建立正确的数学模型，通过平移找解法和调整优值法可以求出整点最优解和非整点最优解及最优值的整点最优解问题．     

基于无缺陷产品退货的供应链协调机制研究

通过数理模型,研究了单一制造商和零售商的供应链下,存在无缺陷产品退货时,集中式和分散式供应链模式的最优决策,得出了最优水平都是努力的边际成本系数的减函数,同时都是边际退货量减少系数的增函数,且集中式供应链下的最优水平都分别高于分散式供应链。以及制造商通过目标减量返利合同激励零售商,使得分散式供应链下的最优决策与集中式供应链一致,此时的最优批发价格等于生产成本,最优的无缺陷产品退货目标量与零售商最优努力水平成反比。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.