保险公司随机保费下的最优投资策略

研究了保险公司在随机保费下索赔服从复合泊松过程的风险模型,通过投资市场上的两种证券,引用财富效用函数,建立了最优投资问题．并根据随机控制理论得到了最大化财富的HJB方程,通过求解模型,得到了公司风险资产的配置额,最后对风险资产的投资进行数值模拟．     

Effects of Time Perspective on Student Motivation: Introduction to a Special Issue

This article introduces this special issue by establishing a conceptual foundation for thinking about how students' conceptions of time influence motivation and achievement. In particular, we describe how students' perceptions of the utility of what they are learning for their futures can positively affect motivation. Temporal perspective is tied to current models of motivation and learning such as intrinsic motivation and self-regulation. We present 2 purposes for organizing this issue: (a) initiating discussion and research about how conceptions of the future influence and are influenced by students' motivation and (b) bridging gaps in the field between American and international perspectives on learning and motivation. We conclude by introducing the 6 articles that comprise this special issue of Educational Psychology Review.     

组合投资中有效边界的一些性质和模型

本文研究了组合投资中有效边界的数学模型及其性质,并给出了计算最优证券组合的数学模型和公式。     

西安地区体育知识资源利用分析——兼谈资源向资本转化

通过分析,研究探讨了西安地区体育知识资源蓄备状况,以及该地区体育知识资源转化为体育知识资本状况。结果表明：西安地区有着丰富的体育知识资源,形成了以专业体育院校、研究所、运动队为中心,以各普通高校、中学体育师资为骨干的蓄备格局。但由于观念、体制、方式、方法等问题的制约,这些知识资源还未有效地转化为知识资本,没有发挥应有的价值。提出转变观念,树立以人才为中心等开发设想。     

论经济学价值论的三个基本问题——兼论价值论研究的必要性

价值本质、价值源泉和价值尺度是价值论的三个基本问题,它们决定价值论的性质,并通过价值论决定经济学的性质。古典政治经济学对这三个问题的回答有两种路线,逐渐演化出两种对立的价值论和经济学体系。两种经济学在理论和实践中的隔阂和对立使价值论以不同的方式退出了经济学的研究范围。中国建设社会主义与市场经济的社会实践对两种经济学的融合与突破提出了迫切需要,也提供了现实条件,这就要求对价值论展开广泛深入的研究。     

交易费用的再认识:基于比较制度的视角

本文在分析现有关于交易费用研究误区的基础上,对交易费用进行了重新认识,并以家庭联产承包责任制实施为案例,以交易费用理论对这一现象进行了解读.研究认为:只有将预期交易费用纳入交易费用统计中,并采用比较制度方法才能得出对交易费用的正确认识;只有使用个体主义的成本收益分析方法才能认识制度变迁中的交易费用承担;只有对同类型交易中的交易费用进行比较才有助于找到降低交易费用的路径及方法.     

试论体育观赏的价值与特征

从审美角度出发,运用文化学、社会学理论,就竟技运动的观赏价值及其特征,进行了理论上的考察与分析     

An analysis of prospective teachers’ knowledge for constructing concept maps

Background: Literature contends that a teacher’s knowledge of concept map-based tasks influence how their students perceive the task and execute the creation of acceptable concept maps. Teachers who are skilled concept mappers are able to (1) understand and apply the operational terms to construct a hierarchical/non-hierarchical concept map; (2) identify the legitimacy of the constructed concept map by verifying its graphical structure and its educational utility; and (3) determine the inherent ‘good’ and ‘poor’ qualities of the resulting graphical structure to reiterate the ‘good’ qualities and to coach and provide feedback to alleviate ‘poor’ qualities.

Purpose: The purpose of this study was to investigate the nature of prospective teachers’ knowledge underpinning the technique used to construct concept maps and thus, explicate their facility to construct concept maps.

Sample, Design and Methods: Data consisted of 200 concept maps constructed by prospective teachers in an elementary science methods course.

Results: Analysis revealed that the prospective teachers had predominantly constructed either hierarchical and/or non-hierarchical concept maps. It is likely that their maps reflect the teaching that they themselves would have experienced in their science classrooms during their own education. Additionally, most of these concepts maps only contained the root concept and subordinate concepts and lacked directional linking lines, linking phrases, labelled lines and propositions.

Conclusions: We argue that teacher educators need to assess their prospective teachers’ understanding of concept mapping in relation to the legitimacy (the nature and quality) of the end-products (graphical structures) of such practices. Prospective teachers also need to understand the educational utility of concept mapping in terms of how these end-products impact and/or effectuate learning.     

效用函数在金融学中的应用

在经济分析中,效用函数用来描述偏好关系。效用函数的不同形式在不同的实际问题中能起到简化问题的作用。介绍了效用函数的幂函数形式和指数函数形式,讨论它们解决问题的方式。最后讨论了效用函数在购买保险中的应用。     

电大分校教师继续教育探究

在电大开放教育的实践中,如何发展电大教师的继续教育呢？文章着重分析了在实施教师继续教育的过程中缺乏针对性和实用性的问题,并提出了增强教师继续教育针对性与实用性的对策.