基于Stackelberg博弈的中国投资北极航道沿线港口开发策略

在冰上丝绸之路建设背景下,北极航道的利用对中国对外贸易重新布局具有重要意义。针对中俄共同开发北极航道的问题,研究中国如何利用资本优势投资沿线港口开发获得长期稳定收益。利用Stackelberg博弈理论建立了中俄双方独立的博弈模型和有其他投资国参与时的混合博弈模型,选择代表性港口、利用DEA进行评价,并整理数据进行实证研究,得出了如下结论：①港口运营成本是影响最终收益的关键要素,在投资时应通过智能化设备和信息平台等降低运行成本。当有多国参与投资时,中国应争取先手优势,或选择组建投资联盟,不能通过压缩收益的方式进行价格战;②投资的港口要保证港口建设水平与港口发展潜力保持匹配,港口的建设水平过高和过低都将影响投资收益,通过DEA有效性评评价,可以找到现有建设水平的不足,并进行针对性调整。对于受政治等因素无法进行设施调整的港口,不作为优先投资对象;③投资额在较低的水平增长时,反而会带来收益的下降,进行联合投资是解决该问题的有效手段。投资的港口的总规模影响收益,需要平衡港口升级难度和港口总规模,优先选择升级难度较低的大规模港口群,而不是选择升级难度大、现代化程度较高的单独港口进行投资。     

一类投资组合模型的模糊两阶段算法

对多目标证券组合投资模型进行了研究，模型以风险损失率作为风险。该模型是一多目标线性优化问题．我们采用模糊折衷算法对模型进行了求解，算例给出了该模型的一个实例的最优解。     

The use of portfolios to foster professionalism: attributes,outcomes, and recommendations

The main objective of this research was to review the characteristics of portfolios and their outcomes for teaching professionalism to undergraduate medical students. A systematic review on the use of portfolios in teaching professionalism to medical students identified 1257 papers. Of these, 11 articles met all inclusion criteria. According to the papers, the use of portfolios for teaching professionalism shows versatility, supports learning strategies and has the potential to be used in different contexts, including for formative and summative purposes. The weaknesses were based on the artificiality of the reflections, deficient instructions, time-consuming processes and preference among students for other teaching methods. Students complained about feeling that the reflection was ‘forced’, and they tended to write based on social conventions rather than reveal their true thoughts. Reflection is a powerful component of the portfolio, but the method by which it is taught could easily ruin its potential to boost professionalism. Requiring reflection did not ensure its achievement; increased understanding by students regarding how and why they were doing it, the clarity of assessment methods and constructive feedback might strengthen the potential for success. A framework was designed to support faculty members in developing and applying portfolios with a clear and broad view of this teaching strategy.     

Dress rehearsal: a Bourdieusian analysis of body work in career portfolio programs

This article examines how career portfolio programs at two secondary schools establish corporeal regimes. Both programs require students to compose portfolios that plot their trajectories through school and into paid work. Prior to graduation, students defend their portfolios before panels of educators and businesspeople. Employing the Bourdieusian concepts of capital and habitus, this article investigates how these programs set up systems that value certain kinds of bodies. Further, it examines how students negotiate these systems and display different kinds of bodies in different kinds of ways. Ultimately, it is argued these disparate bodily performances are read by authorities as indicators of the types of paths students are travelling or should travel into the future.     

基于风险分散化的资产组合分析模型

本文运用概率论与线性代数方法相结合以数学模型来对风险投资进行定量表达,建立了资产组合的分析模型,解决在投资活动中人与风险的抗争关系,以及风险、收益与组合之间的矛盾同一关系。在保持一定收益的前提下,通过资产组合,对风险进行分散化,降低风险,最后给了例证。     

化学档案袋评价的实施及案例

档案袋评价是化学课程标准倡导的评价方式之一。本文简述了初中化学教学中实施档案袋评价对学生发展的意义,阐述了化学档案袋评价的实施过程及其注意点,并提供了实践案例。     

质性评价的有效尝试:通过学生成长记录袋实现评定的发展性功能

现代教育评价强调要在日常教育教学中发挥评价的激励和发展功能，学生成长记录袋正是适应这种要求的一种质性评定方法。本文以国内外成功经验的基础，介绍了学生 成长记录袋的理论背景与主要特征，并探讨了通过行动研究推进这种方法的具体策略。     

Multi-period model of portfolio investment and adjustment based on hybrid genetic algorithm

This paper proposes a multi-period portfolio investment model with class constraints, transaction cost, and indivisible securities. When an investor joins the securities market for the first time, he should decide on portfolio investment based on the practical conditions of securities market. In addition, investors should adjust the portfolio according to market changes, changing or not changing the category of risky securities. Markowitz mean-variance approach is applied to the multi-period portfolio selection problems. Because the sub-models are optimal mixed integer program, whose objective function is not unimodal and feasible set is with a particular structure, traditional optimization method usually fails to find a globally optimal solution. So this paper employs the hybrid genetic algorithm to solve the problem. Investment policies that accord with finance market and are easy to operate for investors are put forward with an illustration of application.     

浅谈档案袋评价在高校教学中的应用

高校教学中传统的评价方式多以量化评价为主,只关注学生的学习结果。这样的评价方式不利于学生综合能力的发展,因此,高校教学中应适当引入质性评价。档案袋评价注重评价的过程性和发展性,在关注学生学习结果的同时也关注学生的学习过程,是比较适合高校教学的一种质性评价方式。     

美国重要癌症基金资助现状分析

本文综合美国主要癌症基金过去7年中对癌症项目的资助情况,从项目的领域分布、项目的数量变化、项目的类型分布、癌症种类情况等多个角度,分析美国癌症基金的资助现状和特点,对了解和把握国外癌症研究方向有借鉴意义,同时为我国癌症基金工作提供有益思路。