基于期权理论的动态证券资产配置策略研究

本文试图通过对基于期权理论的动态证券资产配置策略进行研究,针对中国金融市场的不同行情走势,利用期权理论固定比例投资组合保险策略(CPPI)与时间不变性投资组合保险策略(TIPP)方法,设计保本型产品的投资组合保险策略.该策略以保本为第一考虑,可在保本的基础上,在最大程度上实现参与股市上涨的收益.     

Financial applications of semidefinite programming: a review and call for interdisciplinary research

Optimisation problems in finance commonly have non-linear constraints for which previous solutions have required unrealistic assumptions. However, many of these can be efficiently solved as semidefinite programming (SDP) problems, which have less restrictive assumptions. Through review of the literature that uses SDP in finance, two major research streams are identified: portfolio optimisation and option pricing. Nevertheless, many finance researchers are unaware of SDP. One possible reason is that this research is often published in non-finance journals. This paper aims to better integrate the SDP research to promote wider use of current findings and further interdisciplinary research, particularly in environmental finance.     

General closed-form basket option pricing bounds

This article presents lower and upper bounds on the prices of basket options for a general class of continuous-time financial models. The techniques we propose are applicable whenever the joint characteristic function of the vector of log-returns is known. Moreover, the basket value is not required to be positive. We test our new price approximations on different multivariate models, allowing for jumps and stochastic volatility. Numerical examples are discussed and benchmarked against Monte Carlo simulations. All bounds are general and do not require any additional assumption on the characteristic function, so our methods may be employed also to non-affine models. All bounds involve the computation of one-dimensional Fourier transforms; hence, they do not suffer from the curse of dimensionality and can be applied also to high-dimensional problems where most existing methods fail. In particular, we study two kinds of price approximations: an accurate lower bound based on an approximating set and a fast bounded approximation based on the arithmetic-geometric mean inequality. We also show how to improve Monte Carlo accuracy by using one of our bounds as a control variate.     

股票期权的实践与探讨

作为分配制度变革的股票期权计划，在发达国家运用已有近30年的历史，成为企业一种有效的激励机制。随着我国企业改革的深化与市场经济的确立，急需探索一条科学有效的激励机制。在我国现行的法律体系下，股票期权计划这种长期激励机制吸引了越来越多的注意力。本对我国在推行股票期权计划的实践中所产生的一些问题作了初步的探讨。     

我国推出人民币外汇期权产品的相关问题探讨

全球化趋势下,我国人民币衍生品市场的运作势在必行,我国在具备经济及金融各方面的基础之上,可以在适当的时机推出场内人民币外汇期权。外汇衍生品在宏观经济、风险管理和价格发现等方面发挥着巨大功能作用的同时,也容易引发重大的风险事件。所以,推出人民币外汇期权,必须重视相关的风险管理,正确引导各方市场参与者。     

An Evolutionary Psychology Perspective on Physical Exercise Motives: Implications for Social Marketing

This study uses the theoretical framework of evolutionary psychology to examine the motives driving physical exercise behavior, as evolutionary psychology is still under-explored in the social marketing literature. The study employs a survey that draws on a sample of 220 participants. Independent sample t-tests and analysis of variance are conducted, and findings show significant sex and marital status differences in terms of motivations to exercise. Research findings have original implications for social marketing interventions that seek to understand physical exercise motivations and to encourage increased levels of physical exercise. Further, findings contribute to the extant literature by establishing the importance of sex-based segmentation strategies and message appeals that resonate with specific segments’ innate physical exercise motives.     

Volume,volatility and information linkages in the stock and option markets

This paper examines the relationship between option trading activity and stock market volatility. Although the option market is uniquely suited for trading on volatility information, there is little analysis on how trading activity in this market is linked to stock price volatility. The bulk of the discussion tends to focus on whether trading activity in the stock market is informative about stock volatility. To analyze the information in option trading activity for stock market volatility, a sample of 15 stocks with the highest option trading volume is selected. For each stock, it is noted that the trading activities in the put and call option markets have significant explanatory power for stock market volatility. In addition, the results indicate that the call option trading activity has a stronger impact on stock volatility compared with that of the put options. Our results demonstrate that information and sentiment in the option market is useful for the estimation of stock market volatility. Also, the significance of the effects of option trading activity on stock price volatility is observed to be comparable to that of stock market trading activity. Furthermore, the persistence and asymmetric effects in the volatility of some stocks tend to disappear once option trading activity is taken into account.     

陕西省农村中小学生阳光体育行动“每天锻炼一小时”的实践研究

本文旨在研究出适合陕西省中小学体育课的体育教育模式,让"每天锻炼一小时,健康工作五十年,幸福生活一辈子"的思想深入每一位教师、学生和家长的心中,不断提高学生的体质健康水平,不断提高学生的心理健康水平,为学生的茁壮成长提供有力保障。     

硒与健康的关系及对运动的影响

硒是人体必需的微量元素之一，在人体内含量过低或过高都会对肌体健康产生不利影响。有关硒对运动能力的影响近年来引起人们尤其是运动医学界的广泛关注，文章在简要介绍硒元素生物学作用的基础上，重点阐述了其与几类相关疾病和运动的关系。     

Executive compensation and informed trading in acquiring firms around merger announcements

This paper analyzes informed trading in acquiring firms through (stock) merger announcements. We show that pre-announcement abnormal option volumes in acquiring firms strongly increase ahead of a stock merger (by approximately 300%). Furthermore, we show that the direction of option trades (puts or calls) prior to an announcement can predict post-announcement stock returns. Our results also indicate that higher wealth-to-performance sensitivities of top executives are related to higher abnormal put than call option trading before stock merger announcements. Overall, our results support the view that top executives have a hedging motive. They tend to purchase protection against, e.g., confounding (negative) information policies and/or empire-building mergers with negative NPVs, in order to avoid short-term salary losses (lower bonuses, lower stock options, etc.).