高校英语写作教学模式与改革研究

针对北京林业大学大学英语写作教学的现状和弊端,在分析写作过程教学法特点的基础上,拟定了一套新的大学英语写作教学模式,并通过为期两年的实验对比教学实践证明了这一模式的有效性。与成果教学法相比,过程教学法可帮助学生理解和内化写作的全部过程,提高了学生的写作兴趣,通过写作过程的培养,学生逐步获得了写作技巧。     

组合证券的投资风险分析和选择

根据Markowitz理论研究组合证券的选择,以确定最优投资比例,从而使组合证券投资的风险最小。     

成长记录袋在特殊儿童学习评价中的应用

成长记录袋是一种新兴的质性评价方式,具有质性描述、目的明确、主体参与等特点,在特殊儿童学习评价中有其独特优势,可以作为特殊儿童学习评价的重要形式之一在实践中加以应用。创建与使用成长记录袋要遵循一些基本程序与要求,包括明确目的、确定内容、鼓励特殊儿童参与、确定评分办法、交流与使用。     

Stimulating independent learning: a quasi‐experimental study on portfolio

A portfolio model was developed which can serve as an alternative to the literature study with practical processing, the predominant dissertation model used in teacher education courses in Flanders. Using a pre‐ and post‐test quasi‐experimental design with 174 teacher students and 44 supervisors, we examined whether the use of portfolio as a dissertation model has a greater effect on the students’ capacity for independent learning than the literature study with practical processing, using three questionnaires. The research shows that portfolio results in students acquiring greater metacognitive knowledge. It also appears that students only get the chance to use their metacognitive skills when supervisors give them sufficient autonomy. However, supervisors experience loss of control and therefore tend to restrict students’ autonomy. This leads us to the paradox of independent learning: students will only learn independently when they are given the opportunity to learn independently. Supervisors need to transfer learner control.     

组合投资问题的目标规划模型及其求解

引入非凹非凸的典型交易成本函数形式，考虑分红收益提出含有典型交易成本的组合投资问题的目标规划模型，通过实例对模型中无交易成本、含有V-型交易成本、典型交易成本时所得的有效前沿进行比较，并分析了不同期望收益水平对投资组合的影响．     

Digital Portfolios in Action: Acknowledging Student Voice and Metacognitive Understanding in Art

ABSTRACT

Students need a genuine voice in the content, process, outcome, and assessment of their learning so they can take ownership of their education (Jaquith and Hathaway 2012 Jaquith, Diane B., and Nan E. Hathaway. 2012. The learner-directed classroom: developing creative thinking skills through art. New York, NY: Teachers College Press. [Google Scholar]). Digital art portfolios allow students to research, document, and reflect on the development and assessment of their learning. Unlike traditional portfolios, which typically emphasize product, the use of digital portfolios as a process portfolio for learning has the potential to increase autonomy, experimentation, and allow the student to tell the story of their learning; to be metacognitive about their work (Berrett 2005 Barrett, Helen C. 2005. White paper: Researching electronic portfolios and learner engagement. The Reflect Imitative. Accessed March 15, 2013. https://www.taskstream.com/reflect/whitepaper.pdf [Google Scholar]). For the purposes of our research, we are defining metacognitive as awareness or analysis of one's own learning or thinking processes. The key elements of traditional paper portfolios include: collecting, selecting, reflecting, directing/goals, and presenting/celebrating. The use of technology adds to that list the processes of archiving, linking/thinking, storytelling, collaborating, sharing, and publishing (Barrett 2005 Barrett, Helen C. 2005. White paper: Researching electronic portfolios and learner engagement. The Reflect Imitative. Accessed March 15, 2013. https://www.taskstream.com/reflect/whitepaper.pdf [Google Scholar]). This paper examines how online digital portfolios provide a platform to promote students’ metacognitive skills and direct their learning.     

泛组合证券选择的一个改进递推算法

阐述了组合证券以及泛组合证券的基本概念,根据Cover(1991)提出的泛组合证券策略和Cover(1996)给出的计算b~n的递推算法,提出了泛组合证券选择b~n的一个改进的递推算法,该算法比Cover(1996)’s要简单得多.最后根据证券市场中的数据给出仿真和结果.     

特殊儿童评估的新进展

本文总结了特殊教育中评估方法的新进展.分析了团队评估的形式以及合作型团队的特征;介绍了行为表现评估、以课程为基础的评估与产品集评估等评估方法;探究了特殊化智力测验在特殊教育评估中的重要作用.     

区间数在证券投资组合中的运用

文章用区间数描述了证券的收益率、投资风险和证券流动性的不确定性,基于绝对偏差风险函数和极大极小原则建立了投资组合选择的区间规划模型,并利用区间数的两种序关系将模型转化为普通的参数线性规划问题进而求得其解.     

资产组合有效集的研究

分散化原则的应用已经屡见不鲜,特别是在资产配置上,人们利用它尽量降低风险.为了精确的得到分散化投资组合,以实现最低风险,先从几何方法上推导了三种证券组合的有效集,然后再利用矩阵推导出n种证券组合的最小方差集,并给出了最小方差集的数学表达方式.