Asymmetric volatility in the foreign exchange markets

We examine the presence or absence of asymmetric volatility in the exchange rates of Australian dollar (AUD), Euro (EUR), British pound (GBP) and Japanese yen (JPY), all against US dollar. Our investigation is based on a variant of the heterogeneous autoregressive realized volatility model, using daily realized variance and return series from 1996 to 2004. We find that a depreciation against USD leads to significantly greater volatility than an appreciation for AUD and GBP, whereas the opposite is true for JPY. Relative to volatility on days following a positive one-standard-deviation return, volatility on days following a negative one-standard-deviation return is higher by 6.6% for AUD, 6.1% for GBP, and 21.2% for JPY. The realized volatility of EUR appears to be symmetric. These results are robust to the removal of jump component from realized volatility and the sub-samplings defined by structural-changes. The asymmetry in AUD, GBP and JPY appears to be embedded in the continuous component of realized volatility rather than the jump component.     

美国低成本航空公司经营战略研究

以美国西南航空公司为例,通过分析其竞争战略、价值链系统和经营决策要素,说明低成本航空公司经营成功的经验。以此为借鉴,对中国发展低成本航空公司的不利条件进行分析,指出应通过实行市场化和引入民营资本等措施发展中国的低成本航空市场,以增强行业的整体竞争力。     

MANAGING VENDOR INVENTORY IN A DUAL LEVEL DISTRIBUTION SYSTEM

Collaborative arrangements among members of the supply chain have received a great deal of interest in recent years as a means of reducing costs. One such arrangement is vendor managed inventory (VMI). VMI allows the vendor to make decisions concerning the quantity and timing of deliveries to the retailer. Such an arrangement offers the potential of a more efficient supply chain by removing the negative effects of retail ordering policies. A thorough review of the literature was conducted to identify factors likely to impact the performance of a VMI partnership. Computer simulation was used to study the effects of these factors from both the vendor's and retailer's perspectives. The results lend insight into the performance of VMI and guidance for managers as to the environments in which VMI is most effective.     

国家助学贷款的饮坷之路

全国高校2005年度录取工作已经结束了，寒窗苦读十几载的学子们有的名落孙山，有的鲤鱼跳过了龙门。然而，就在这些挤过独木桥的幸运儿中，有敲锣打鼓、兴高采烈者，亦有因交不起学费而偷偷落泪者。几家欢喜几家忧，穷人家的孩子只能眼巴巴地盼着国家的助学贷款。而备受瞩目的国家助学贷款一路走来，前景又如何？     

渠道压缩:中间商该何去何从?

中间商的出现是为了满足生产商和市场对于渠道的需求而产生的。但随着生产商和市场的发展,其对于渠道的需求也在发生着变化。同时外部条件的变化也影响着生产商对渠道的需求。本文从生产商对渠道的需求的角度以及中间商满足需求的能力的角度来分析中间商的发展趋势。     

A semiparametric GARCH model for foreign exchange volatility

A semiparametric extension of the GJR model (Glosten et al., 1993. Journal of Finance 48, 1779–1801) is proposed for the volatility of foreign exchange returns. Under reasonable assumptions, asymptotic normal distributions are established for the estimators of the model, corroborated by simulation results. When applied to the Deutsche Mark/US Dollar and the Deutsche Mark/British Pound daily returns data, the semiparametric volatility model outperforms the GJR model as well as the more commonly used GARCH(1,1) model in terms of goodness-of-fit, and forecasting, by correcting overgrowth in volatility.     

山西天镇晚白垩世恐龙动物群发掘简报

文章简要介绍了山西天镇晚白垩世恐龙化石的发现、发掘概况及动物群的特征，讨论了含化石地层—灰泉堡组的时代，认为无疑应属晚白垩世。以晚白垩世蜥脚类巨龙科和鸟臀类甲龙科化石为代表，别具特色的新恐龙动物群为一突破性的发现，对它的深入研究，将对蜥脚类、甲龙类及其共生动物群的组成、性质、演化、迁徙和动物地理区的划分及探讨白垩纪末恐龙的绝灭有重要的科学意义。     

浅析多媒体技术在车辆工程教学中的应用

随着教育的发展 ,传统的教学方法已不能满足时代的需要 ,亟待运用现代教育技术手段 ,特别是多媒体的教学形式进入课堂 ,以发挥其特有的功能来提高学习效率。本文浅淡了如何在车辆工程教学中运用计算机多媒体的图、文、声、像并茂的特点 ,有效的激发学生的学习兴趣。     

论数量经济学的学科性质

数量经济学的学科性质研究，是我国市场经济条件下经济学面临的一个新课题．论文对数量经济学学科性质的不同观点进行了认真剖析，指出：数量经济学是在科学理论的指导下．在质的分析的基础上，融经济学、数学、统计学、信息科学于一体，以现代科学方法和手段，研究经济现象内部的数量表现、数量关系及其变化规律的一门学科．既是一门基础性理论与方法论学科，也是一门发展中的综合性交叉应用学科，是经济科学的一个重要分支．     

关于转变经济增长方式的几个问题

本文对当前我国学术界关于粗放与集约概念的由来及转变经济增长方式含义的几种观点作了简要的评析;对如何正确理解实现经济增长方式的转变提出了自己的看法;论述了转变经济增长方式的必要性和转变的数量界限;阐明了顺利实现经济增长方式转变应处理的几个方面的关系。