基于排队论的快餐厅点餐模式优化研究

快餐厅日益成为人们生活的一部分,但是在快餐厅点餐时排队时间过长逐渐引起了顾客的不满。基于排队论对快餐厅点餐模式进行优化研究,讨论当前多队列多服务台的点餐模式,给出一种单队列多服务台的点餐模式,并对两种点餐模式进行比较,结果表明快餐厅采用单队列多服务台的模式经营,可提高服务质量和经济效益。     

The Concept of Tens and Hundreds in Students with Down Syndrome

ABSTRACT

We present an evaluation of the understanding that adolescents and adults with Down syndrome (DS) have of the decimal number system. The results of two studies are presented. The first was a case study with interviews of three adolescents and three adults with Down syndrome. Our results indicate that their conceptual understanding of the meaning of the tens and hundreds places is not as well developed as their ability to read, write and work with numbers of up to three digits. We also analyse the progress made by a 17- year-old student with Down syndrome after following a learning programme intended to improve her understanding of the tens place. To this end, we designed number tasks using four constructs: counting, grouping, partitioning and ordering. The student’s achievements in the counting construct were greater than in the others, exhibiting an understanding and use of the tens as a unit of counting to solve many of the number tasks proposed. Also evident was a progression in her understanding of the positional value. We observed differences in her success rate and variability in her responses depending on the method used in the tasks to represent the numbers.     

Here Today,Gone Tomorrow: The Vicissitudes of Vendor/Library Relations in the Slavic and East European Book Trade

ABSTRACT

This paper discusses the transformations in the Slavic and East European book trade in the 1990s. Among the challenges these changes pose to Slavic librarians are a profusion of new vendors, very small print runs, and a general breakdown in bibliographic control throughout the region. It argues that vigilant and timely selection is critical in order to obtain materials before they go out of print. Cultivating direct relationships with vendors both in North America and in the region is also required in order to continue to build Slavic collections successfully. It also considers the performance of English language approval plan vendors, electronic vs. print, and the ominous implications that the trend toward mergers and economies of scale hold for library collections.     

突发性自然灾害紧急修复的数学模型

通过对供电系统紧急修复四种不同排序方案的分析,给出了较为合理的修复方案。     

优化期刊管理提高期刊利用率

分析期刊订购管理的优化与日常业务管理的简化,探讨开发期刊信息资源,提高期刊利用率的具体措施.     

Banach空间中非混合单调算子的不动点定理

运用锥理论与非对称迭代方法，得到了Banach空间不具有单调性、连续性和紧性条件的二元算子的不动点的存在唯一性，并给出了迭代序列收敛于解的误差估计，所得结果改进和推广了混合单调算子方程的某些已知结果。     

Banach空间中一类反向混合单调算子方程的迭代解法

运用半序理论与单调迭代技巧,讨论了一类反向混合单调算子方程A(x,x)=Bx解的存在唯一性,并给出了迭代序列收敛速度的误差估计,所得结果是某些已有结果的本质改进和推广.     

浅谈新形势下现代公共图书馆的职能内涵

在信息化和多媒共享的新形势下,现代公共图书馆的职能也逐渐发生了转变,除了四大基本职能,现代图书馆将在数据序化方面发挥更大的作用,从而有利于国家和各级政府进行预测和决策,有利于社会团体对于运营项目的风险控制,甚至会参与到个人事务的管理和实施,即体现为一个新职能--参与社会管理职能。     

订单教育在高职院校实践的困境与出路——以漳州职业技术学院为例

近年来,“订单教育”作为一种重要的新型人才培养模式,迅速发展起来。但也面临教学传统与教学改革相抗衡、人才培养不适应企业需求、订单就业协议难以如期兑现、校企合作主体功能缺失等困境。学校要解放思想,加快推进教学改革,促进校企合作一体化,加强与企业的沟通,了解企业实际需求,培养学生的综合职业能力,提高契约兑现率。     

一类偏微分方程的并行多分裂迭代算法

许多工程和物理应用问题的求解通常都归结为求微分方程数值解.考虑到传统的偏微分方程求解算法仅适应于串行机以及单机性能无法满足大规模科学与工程问题的计算需求,针对一类偏微分方程,提出了相应的并行差分格式和并行多分裂迭代求解算法,通过编程将其与红-黑排序、共轭梯度法的加速比和并行效率进行比较,验证了多分裂迭代法在求解偏微分方程中易于实现并行,且具有良好的可扩展性.