On optimal investiment strategies

Suppose an investor has a fixed decision horizon and an appropriate utility function for measuring his or her utility of wealth. If there are only two investment vehicles, a risky and a risk-free asset, then the optimal investment strategy is such that, at any time, the amount invested in the risky asset must be the product of his or her “current risk tolerance” and the risk premium on the risky asset, divided by the square of the diffusion coefficient of the risky asset. In the case of more than one risky asset, the optimal investment strategy is similar, with the ratios of the amounts invested in the different risky assets being constant over time.     

360度绩效评价研究

绩效评价是现代人力资源管理的重要内容之一,如何客观、公正地评价员工的绩效,采用更加灵活的模式评价管理者的工作,是当前人力资源管理与实践亟待探讨和解决的问题。本文阐述了360度评价法的产生和发展过程,通过对案例的分析进一步说明其优缺点,最后提出展望。     

Comparing the impacts of Internet technology and national culture on online usage and purchase from a four-country perspective

The Internet has successfully generated an ever-expanding cohort of users for all its major concomitant activities, including information gathering, communications and transactions. So far no attempt has been made to validate whether such a success is so deep as to transcend national cultures. Nor any work has been conducted to compare the internationalisation¹ performances between online usage activities. The current study addresses these two research gaps from the perspective of four countries, i.e. Britain, Germany, Japan and Taiwan. Results show that although the technological forces have been quite successful in internationalising overall online usage activities, they succumb to the cultural forces as far as only the transactions activity, or more colloquially online purchase, is concerned. This indicates the relative difficulty in internationalising online purchase vis-à-vis other online usage activities. Further research on locating a series of step functions or kick-off time points regarding the development of online purchase is suggested.     

矩阵求逆的一个算法

由已知n阶矩阵A构造一个n阶矩阵序列A~(k)(k=1,…,n)以及相应的初等变换矩阵E_(kx),然后利用矩阵的乘法,递推求得A的逆或断定A不可逆。并且给出了算法和理论依据。     

钢结构随机有限元动力分析

钢结构在应用一段时间后,物理参数和几何参数的变化将导致结构参数发生某些不确定性的改变, 这将会影响结构的力学特性.从此问题出发,通过一个算例详细阐述了用摄动随机有限元法解决此类问题的实现过程.     

我国中小企业融资困境及对策研究

我国中小企业融资难,资金紧缺问题严重阻碍了我国中小企业发展,早已是不争的事实。应加快国有商业银行的市场化改革,完善国有商业银行信贷管理体制,建立适合我国中小企业特征的间接融资市场体系、直接融资市场体系、信用管理体系和融资服务配套体系,促进中小企业发展。     

Reflections on discriminant validity: Reexamining the Bove et al. (2009) findings

Bove, Pervan, Beatty and Shiu (2009) develop and test a latent variable model of the role of service workers in encouraging helpful behaviors by customers towards the service business (OCBs). Farrell (2010) questions these findings due to an incorrect application of the Fornell and Larcker (1981) discriminant validity test. The authors respond to Farrell's criticism by discussing the options available for assessing discriminant validity, the current use of these options in top journals, the underlying assumptions of these assessments, and the appropriateness of the alternative assessments under different types of situations. Finally, the authors address the specific concerns raised in Farrell (2010) in regard to Bove et al. (2009).     

中国现阶段矿产资源短缺因素分析

当前和未来一段时间中国经济发展所面临的关键制约因素是矿产资源短缺问题,而造成短缺的关键在于资源消费增长过快。要保持经济的健康、平稳和可持续发展,就必须对矿产资源予以保护与合理开采,完善法规,加强管理,优化产业结构,从根本上扭转或缓解资源短缺给中国经济发展带来的影响。     

高层住宅三步节能工程质量控制

在全国范围内首次推行三步节能建设目标,尤其对民用建筑的屋面、门窗、采暖、地面和墙体等的节能工程及检测等领域,做出了多方位的研究和探索,取得的成效也颇为明显,同时也为我国寒冷地区的民用建筑节能设计、施工及验收等能够达到三步节能建设目标奠定了基础。三步节能工程中,施工是保证,材料是基础,设计是关键,检测是评价。笔者就高层住宅三步节能工程的质量控制进行了具体的阐述。     

银行经营战略的转型：英国劳埃德银行的案例

劳埃德银行(LloydsBank)是英国四大银行之一,成立于1765年,原名泰勒与劳埃德公司,是英国历史最悠久的银行之一。20世纪80年代以来,该行实现了银行经营战略的转型,并取得了巨大的成功。本文对其在80-90年代经营战略转型经验进行了总结,希望为我国商业银行零售业务体制改革提供借鉴。