久期技术与基于隐含期权的商业银行利率风险管理   总被引：4，自引：0，他引：4  

杨飞 《科技与管理》2006,8(6):104-107

从衡量利率风险的久期与凸度技术出发，重点探讨了基于隐含期权及期权调整利差的有效久期和有效凸度模型，并研究了其在我国商业银行利率风险管理中的具体应用。  相似文献   

Sleep quality in athletes under normobaric hypoxia equivalent to 1500 m altitude: A polysomnographic study     

《European Journal of Sport Science》2013,13(3):191-198

Abstract

In the present study, we evaluated the duration of slow-wave sleep (Stage 3 and 4) and total delta power (< 3Hz) in all-night non-rapid eye movement (NREM) sleep electroencephalograms (EEGs) of athletes during normobaric hypoxia at simulated altitudes of 1500 m. Seven male athletes slept for two nights in a normoxic condition and one night in an hypoxic condition equivalent to an altitude of 1500 m. Whole-night polysomnographic recordings, thoracic and abdominal motion, nasal and oral airflow, and blood oxygen saturation (SpO₂) were recorded. Visual sleep stage scoring and fast Fourier transformation analyses of EEG were performed using 30-s epochs. Mean and minimum SpO₂ decreased significantly during sleep in the hypoxic condition. Between groups, changes in heart rate, respiratory disturbance measures including apnoea and hypopnoea, slow-wave sleep and total delta power of the all-night NREM sleep EEG were small and non-significant for the hypoxic condition_. However, individual difference in time at an SpO₂ below 90% were large in the hypoxic condition, and both slow-wave sleep and total delta power of all-night NREM sleep EEG decreased in three participants who spent a prolonged time below 90% SpO₂. The present results suggest that monitoring time below 90% SpO₂ is recommended when studying individuals' living-high schedule even under hypoxic conditions equivalent to an altitude of 1500 m.  相似文献   

太极拳运动单脚支撑姿势持续时间与地面反作用力特征的分析     

杨春荣 《沈阳体育学院学报》2007,26(4):120-121

运用摄影测量法和Novel Pedar-X足底压力测试系统采集了16名太极拳练习者在太极拳运动和正常步行中足底压力和运动影像信息,并对两种运动方式的单脚支撑姿势持续时间指标进行对比分析。研究表明:与正常步行相比,在太极拳运动中单脚支撑姿势总的持续时间所占比例(标准化值)较少(P<0.05);单次单脚支撑姿势平均持续时间较长(P<0.01);认为太极拳运动可以提高人体单脚平衡能力。另外还发现太极拳运动和正常步行中地面反作用力都在不断变化;太极拳运动中地面反作用力小于其正常步行值。  相似文献   

Elements and symptoms of an ineffective higher education system: evidence from a Greek university     

《Journal of Further & Higher Education》2012,36(3):431-450

University studies in Greece are characterised by a symptom usually described as ‘prolonged student status’. This refers to students who prolong the period of their studies beyond the expected length for degrees, sometimes by many years. This article, as well as recording the distribution of the duration of studies in a public institution, reveals that a longer period of studies is strongly and negatively associated with academic performance. It then seeks to identify the causes of the symptom by examining two hypotheses. The first attributes prolonged student status to the operation of some objective factors such as differences in students’ initial abilities and differences in students’ socio‐economic background. The second hypothesis associates a long stay at the university with the educational setting. The existing evidence lends support to the second hypothesis.  相似文献   

中国出口贸易持续时间及其影响因素研究——基于Cloglog模型          下载免费PDF全文

杜运苏  王丽丽 《科研管理》2015,36(7):130-136

本文利用非参数K-M生存分析法和离散时间Cloglog模型对中国出口贸易持续时间及其影响因素进行了实证分析。结果表明:中国出口贸易动态变化较为显著,持续时间的中位数只有2年,且存在"门槛效应"效应,超过4年以后失败的概率明显降低;目的国经济规模、首次出口额、多元化等上升有利于降低出口贸易失败的概率,而地理距离、单位价值、人民币汇率等上升则会增加出口贸易中断风险。最后,就延长中国出口贸易持续时间提出了一些建议。  相似文献   

How much exercise are older adults living in nursing homes doing in daily life? A cross-sectional study     

Philipe De Souto Barreto  Laurent Demougeot  Bruno Vellas  Yves Rolland 《Journal of sports sciences》2015,33(2):116-124

Information on the amount of exercise practised by nursing home (NH) residents is scarce. This study aimed at describing NH residents’ participation in exercise classes, as well as to examine whether the presence of a professional exercise instructor in the facilities is associated with residents’ exercise habits. The cross-sectional data of 5402 residents (median age = 88 years; mostly women (75.2%)) from 163 NHs in France were analysed. Adjusted logistic and linear regressions were performed to examine whether the presence of a professional exercise instructor in the NH was associated with exercise habits: exercise participation, frequency, duration, and levels. From the 5402 participants, 1914 were participating in exercise classes provided in the NH. Most of them had an exercise frequency of 1x/week or less. Median duration of exercise sessions was 45 min. Exercise levels were rated as: highly active (n = 487), intermediately active (n = 1096), and poorly active (n = 331). The presence of a professional exercise instructor working in the facility was significantly associated with exercise participation and with higher exercise frequencies and levels, and session duration. In conclusion, the presence of professional exercise instructors is associated with better exercise habits in NH residents. Improved exercise habits may potentially be translated into better health in this population.  相似文献   

关注青少年，关注睡眠     

李卓玲 《科教文汇》2014,(16):91-92

“三更灯火五更鸡,正是男儿读书时”是对中国学子求学的深刻描述。而随着现代化与信息化的不断发展,对青少年学历的要求也越来越高。成绩仍是衡量学习能力的重要标志。来自各方的压力不得不让其花掉更多的时间来完成任务。高中生为了提高学习成绩,往往利用午睡和晚休的时间加班学习,以致有些高中生上课精神不佳,学习效率低,学习成绩很难提高。身体与心理都处于亚健康状况,因此有必要呼吁更多的人意识到充足的睡眠对于学生生活学习方面的重要性,让更多的人在关注发展的同时关注他们的身体。  相似文献   

运动时间诱导大鼠 Resistin 表达差异的研究     

刘淑梅  王耀光  李梅月 《山东体育科技》2014,(4)

以观察不同运动持续时间对大鼠 Resistin 蛋白表达的影响为主要研究目的,经2型糖尿病大鼠建模后,将62只正常及糖尿病大鼠分为6组：正常对照组,糖尿病对照组和糖尿病运动4组（20、40、60和80分钟组）。在运动组大鼠进行一次中等强度的跑台运动后,用 SDS -聚丙烯酰胺凝胶电泳法检测大鼠蛋白的表达情况。与糖尿病对照组相比表明各运动组 Resistin 蛋白含量显著下降（P ﹤0.01）;与20分钟和40分钟组相比,60分钟组下降的幅度具有显著性差异（P ﹤0.01和 P ﹤0.05）。由此得出结论：持续运动达60分钟的中等强度运动对 Resistin 蛋白表达的影响好于其他运动时间。  相似文献   

身体锻炼影响中学生自尊的路径分析   总被引：12，自引：2，他引：10  

苏坚贞  季浏  徐波  毛坚刚 《武汉体育学院学报》2005,39(2):54-56

自尊是最能标示和影响情绪及生活调节状况的人格变量,它与心理健康有着非常密切的联系。在锻炼心理学领域,自尊也是一个非常重要的概念。采用路径分析的方法去寻求身体锻炼与中学生自尊的关系,发现身体锻炼的各因素和中学生自尊之间存在着显著的直接和间接的关系。通过身体锻炼的方式提高中学生自尊的途径有5条。运动强度对提高中学生的自尊具有非常重要的作用。  相似文献   

音乐疗法对运动员运动性失眠的影响   总被引：2，自引：0，他引：2  

郭建龙  李振斌 《山东体育科技》2006,28(2):34-36

通过查阅文献资料,总结了有关专家对运动疲劳以及音乐疗法研究的理论和成果。对运动性失眠产生的原因、主要的治疗方法、音乐疗法的历史背景和现状及音乐疗法对人体生理与心理的良好作用等方面进行探讨和研究,为教练员和运动员在训练和比赛后能及时消除运动疲劳以及运动性失眠提供参考依据。  相似文献