基于单元星形光纤网的最大总光程及其求解方法

研究了单元星形光纤网中,最多光路数目与最大允许光链路损耗间的关系,推出了在给定最大允许光链路损耗、不同光路数目时各路总光程的求解方法,进而得到最佳光路数目与最大总光程,最终得出六条结论。     

Performance of Ethical Mutual Funds in Spain: Sacrifice or Premium?

There is currently much debate in the economic literature about whether ethical investment involves a financial sacrifice or premium. One of the most common methods of testing this compares the financial performance of ethical investment funds with that of other funds not considered “socially responsible” or ethical. The majority of these research studies evaluate the performance of the ethical funds according to classic measures, whereby different financial markets, in different countries and for different periods of time serve as reference for evaluation. The ultimate conclusion of all of these studies is that there are no significant differences between the performance results of one type of funds and the other. In Spain, ethical investment funds are still an incipient sector of investment. To date, the Spanish market has not been included in any type of analysis of these characteristics. Therefore the main objective of this article is to compare the financial performance of ethical investment funds to that of other funds in the Spanish retail market. We propose the aggregate type of analysis as the Spanish ethical investment funds have experienced a weaker development in comparison to those of other developed countries. In the first step we suggest the financial performance to be compared by style analysis since the asset distribution of the Spanish Social Return Investment (SRI) funds differs from the European trend. In particular, we use the multifactor regression model with style benchmarks. We found that their financial performance is in all cases superior or similar to that achieved by the rest of the funds. In the second step, to achieve a more robust and homogeneous comparison, we used the bootstrap method, comparing ethical and non-ethical fund subsamples by homogeneous groups. No significant differences between these two types of funds have been found. Thus, if we assume the positive o neutral effect of ethical investment on investor utility in the retail Spanish market the financial and social performance (FSP) of ethical funds will be, in aggregate, superior to the FSP achieved by conventional funds. In conclusion, the financial performance of ethical mutual funds in Spain is no sacrifice.     

A new higher-order weak approximation scheme for stochastic differential equations and the Runge–Kutta method

The authors report on the construction of a new algorithm for the weak approximation of stochastic differential equations. In this algorithm, an ODE-valued random variable whose average approximates the solution of the given stochastic differential equation is constructed by using the notion of free Lie algebras. It is proved that the classical Runge–Kutta method for ODEs is directly applicable to the ODE drawn from the random variable. In a numerical experiment, this is applied to the problem of pricing Asian options under the Heston stochastic volatility model. Compared with some other methods, this algorithm is significantly faster. This research was partly supported by the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Scientific Research (C), 15540110, 2003 and 18540113, 2006, the 21st century COE program at Graduate School of Mathematical Sciences, the University of Tokyo, and JSPS Core-to-Core Program 18005.     

高职院校物流管理课程教学方法改革探讨

教学方法是完成教学任务、实现教学目的的关键。物流管理课程教学方法改革是我院物流管理课程建设的一个重要内容。本文总结分析教学方法改革的指导思想、主要的教学方法、基本要求。     

雷达发射信道中的噪声

本文介绍了经常被人们忽视的，有关发射信道中的噪声问题，提出了降低噪声的方法以及在处理信道噪声时应注意的几个方面。     

知识管理及其应用

知识管理就是在最恰当的时间传递最恰当的知识给最恰当的人,使他们能够做出最恰当的决策并避免重复性的劳动或重复性的错误;知识管理是一个整体的、综合的概念,包容了心理、组织、文化、信息技术等诸多方面的因素;知识管理系统地管理重要的企业知识以及知识的创造、收集、整理、传播和利用过程;知识管理需要将个人知识转变为企业知识,并在整个企业中以合适的方式进行应用和共享。它的实施是一个十分复杂的过程,涉及到企业管理的各个方面,对于不同的企业,实施的过程也不一样。     

浅谈基础日语的教学

基础日语教学在语音、词汇、句型等教学环节中存在一些值得注意的问题。不同的教学内容应该采取不同的教学法,以提高教学效果。     

认清应用型本科教育特点把握独立学院教学方法改革走向

掌握应用型本科教育的特点是独立学院深化教学方法改革的基础。在《教育部关于全面提高高等教育质量的若干意见》中,又再次强调：＂创新教育教学方法,倡导启发式、探究式、讨论式、参与式。＂做为我国高等教育的重要组成部分——独立学院认真贯彻落实教育部的这一指导意见,责无旁贷。那么独立学院如何进一步创新教育教学方法？笔者认为要研究和解决的问题很多,但是,认真掌握应用型本科教育的特点包括教育对象的特点,是深化教学方法改革需要解决的一项重要的基础性课题。     

基于资源共享的网络审计程序与方法设计

计算机和网络技术的飞速发展,必然引起审计理论和技术的深刻变革。本文在分析网络审计概念、特征及优势的基础上,提出了基于资源共享的网络审计程序与方法,并对开展网络审计所面临的问题进行了讨论。     

大直径BDF薄壁管现浇空心楼面的施工技术

以一高校体育馆工程为例,介绍大直径(Φ400)BDF薄壁管现浇预应力砼空心楼面的施工过程,着重阐述其施工方法、工艺过程及在施工中的相关质量保证措施.