基于模糊-遗传杂合算法对证券投资市场时机预测的研究     

李波  张世英 《天津大学学报(英文版)》2000,6(1):28-31

基于证券市场和国家经济数据密切相关的思想提出一种根据国家综合经济数据对证券投资市场时机进行指导预测的方法 .采用模糊逻辑和遗传算法相结合来描述综合经济数据和各种资产类之间的相关关系 ,模糊逻辑表征经济数据的上下波动在多大程度上影响这种相关关系预测的准确性 ,而遗传算法的全局搜索能力保证得到综合经济数据与证券投资之间在最小风险条件下的投资时机决策关系 .最后 ,用该方法对股市实例进行仿真实验 ,得到较为理想的结果  相似文献   

第十七届世界杯足球赛进球分析   总被引：3，自引：1，他引：2  

杨维强  周保辉 《南京体育学院学报(社会科学版)》2003,17(3):106-108

阐述了第十七届世界杯足球赛全部入球的主要手段和技战术配合的形式、路线以及射门得分的主要位置 ,区域和时间 ,为全面了解本届世界杯入球的技战术特点和现代足球的发展方向提供参考依据  相似文献   

The effects of baseball bat mass properties on swing mechanics,ground reaction forces,and swing timing     

Walter A. Laughlin  Kyle T. Aune  Alek Z. Diffendaffer 《Sports biomechanics / International Society of Biomechanics in Sports》2016,15(1):36-47

Swing trajectory and ground reaction forces (GRF) of 30 collegiate baseball batters hitting a pitched ball were compared between a standard bat, a bat with extra weight about its barrel, and a bat with extra weight in its handle. It was hypothesised that when compared to a standard bat, only a handle-weighted bat would produce equivalent bat kinematics. It was also hypothesised that hitters would not produce equivalent GRFs for each weighted bat, but would maintain equivalent timing when compared to a standard bat. Data were collected utilising a 500 Hz motion capture system and 1,000 Hz force plate system. Data between bats were considered equivalent when the 95% confidence interval of the difference was contained entirely within ±5% of the standard bat mean value. The handle-weighted bat had equivalent kinematics, whereas the barrel-weighted bat did not. Both weighted bats had equivalent peak GRF variables. Neither weighted bat maintained equivalence in the timing of bat kinematics and some peak GRFs. The ability to maintain swing kinematics with a handle-weighted bat may have implications for swing training and warm-up. However, altered timings of kinematics and kinetics require further research to understand the implications on returning to a conventionally weighted bat.  相似文献   

人民币升值--挑战与机遇并存的国际博弈     

王亚 《江苏广播电视大学学报》2004,15(1):53-56

人民币升值在短期内是不现实的，但从长远看客观存在的人民币升值的内外压力必将使人民币升值由预期转化为现实。人民币升值是挑战与机遇并存的博弈，理性地对人民币升值的时机、方式、制度安排等早做研究，将有助于我国在这一未来最大的国际金融政策的博弈中胜出。  相似文献   

产量特征视角下页岩气资源开发投资时机选择研究     

刘子晗  郭菊娥  王占浩 《科技管理研究》2016,(9)

同时考虑投资和生产阶段的灵活性,将单井产量递减性和区块资源丰度差异性纳入到实物期权理论分析框架,构建不确定环境下页岩气区块价值评价模型及投资决策模型,给出最佳投资时机方程式,并通过静态比较与数值分析进一步探讨不确定性和产量特征对最佳投资时机的影响.研究发现:以页岩气井口价格波动为代表的不确定性增大了开发企业的等待价值;单井产量递减率的存在减小了页岩气区块的期权价值和投资价值,产量递减率越大,项目价值越小,开发企业更愿意推迟投资以确保当前不受损失;区块资源丰度表征着页岩气开发项目期权价值和投资价值大小,区块资源丰度等级越高,越能更早触发投资.  相似文献   

Gross Motor Coincidence Timing by Children with Learning Difficulties and Children Matched on Mean Chronological and Mental Age     

Susan M. Jacklin 《Research quarterly for exercise and sport》2013,84(1):30-35

Abstract

This study examines the learning by children with learning difficulties of a gross motor coincidence timing task, compared with that by children of average intelligence of an equivalent chronological age and mental age. The gross motor coincidence timing response was seen as representative of a particular task category. Using a task classification scheme based on the mobility or otherwise of the environment, the total body and the body parts, the two movement responses required of the children were seen as characteristic of the “environment in motion, total body in motion, body parts stationary” class, the difference between the two lying in their ballistic or controlled nature. The findings suggest that, as a group, the children with learning difficulties perform at a level lower than either of the matched groups. Differences in the nature of the errors for the two response patterns were particularly evident for the group of children with learning difficulties.  相似文献   

基于DS12887的一种新型智能节水系统研制     

侯凤云  智爱娟  范刚龙 《洛阳师范学院学报》2011,30(2):61-63

智能有效的节水系统研制对于我们倡导的可持续发展有着重要的意义,本文介绍了一种自适应节水系统,阐述了系统的硬件和软件设计方法,该系统以DS12887为时钟芯片,以89S52单片机为核心,实现了手动放水、红外模式、定时模式和软件防冻等自适应控制功能,并且附加了控制器上的时钟显示功能.该系统经过试运行,性能稳定,能有效地节水且符合卫生要求,适于高校沟槽式公厕节水系统的应用和推广.  相似文献   

私募股权投资时机对被投企业盈利能力影响的实证研究     

王兆龙  曲世友  刘通 《预测》2015,(4)

私募股权投资时机的选择是近年来学术界研究的热点问题。本文研究私募股权投资时机对被投企业盈利能力的影响,选取深圳中小板的企业数据进行实证研究,结果发现私募股权投资选择不同的时机进入,会对被投企业的盈利能力产生不同影响。初创期进入与企业盈利能力存在显著的正相关关系,扩张期进入则没有显著的相关关系,但是成熟期却与企业盈利能力存在显著的负相关关系,进入时机越早,对提升企业盈利能力的作用越明显,企业的资金和资本越能够得到迅速增值。  相似文献   

试析行政公文"报告"的行文时机     

吴洪琳 《长江工程职业技术学院学报》2010,27(4):68-69

行政机关公文中行文时机涉及到公文的运作是否有效。本文针对现行公文运作中出现的一些不同理解进行分析,以报告文种为范例规范对行文时机的认识。  相似文献   

基于状态空间神经网络和扩展卡尔曼滤波的主动交通感应控制     

过秀成  李岩  杨洁 《东南大学学报》2010,26(3):466-470

为改善方案选择式交通感应控制输出的交通信号配时方案滞后于实时交通状态的缺点,提出用状态空间神经网络和扩展卡尔曼滤波模型预测未来交通状态的优化配时方案.采用能反映道路网络几何特征的状态空间神经网络拓扑结构,结合当前时段和前一时段的路段交通状态,预测下一时段交通状况并选择与其相匹配的信号配时方案;应用扩展卡尔曼滤波训练状态空间神经网络,提高其训练效率及精度.选用南京市广州路的实测交通数据和由多目标遗传算法得出的最优信号控制方案验证模型的有效性.研究结果表明,与BP神经网络和状态空间神经网络相比,所提出的模型能够根据道路状况选择合适的交通控制方案.  相似文献