基于因子偏离度的GBDT多因子选股模型

为了避免股票市场中因子之间复杂非线性关系引起的多因子选股模型过拟合现象,基于因子偏离度对股票因子数据进行分析,筛选影响股票收益率的有效因子,通过梯度提升树对股票影响因子的权值进行不断调整和分析,建立一个DEV-GBDT量化选股模型,再根据基于因子偏离度的GBDT多因子选股模型的预测结果进行模拟交易,以沪深300指数成分...     

Feminine sexual desire and shame in the classroom: an educator’s constructions of and investments in sexuality education

ABSTRACT

Within the growing body of literature on sexuality education in South Africa, researchers have highlighted how teachers may face, or themselves be, barriers to the implementation of rights-based comprehensive sexuality education. Important issues with regard to educators are: firstly, the social and discursive space within which educators are located; and secondly, the complex emotional and psychic investments that educators take up within particular discourses and practices. This paper explores, through a psychosocial reading of an interview extract with a particular educator based in the Eastern Cape of South Africa, how discursive and psychic concerns are sutured within the complex subjectivity of the educator as the medium for sexual education in schools. Specifically, it highlights the numerous ways in which feminine sexuality and desire may be avoided, denied and silenced. Even when feminine desire is specifically evoked as in this case, it is done so in a way that ensures social and cultural respectability, thereby reproducing shame narratives that form and maintain traditional gender discourses. Our analysis demonstrates how engaging with educators as subjects with their own sexual history and psychic dynamics, and as individuals with raced, gendered and classed identities, is a potentially transformative perspective for effective sexuality education.     

电子商务网络空间安全建设的零售商投资协同机制研究

针对电子商务中零售商的网络空间安全投资问题,在考虑存在负外部性的前提下,采用博弈论理论首先对两个零售商的投资博弈进行均衡分析,然后对多个零售商的博弈进行均衡分析,并进行仿真模拟。研究结果表明:投资阈值与零售商的网络空间安全水平呈正相关关系,与已投资网络空间安全的零售商数量呈负相关关系。根据结论分析,提出需要制定合理的规章制度和采取必要的补贴措施,加强对电子商务零售商网络空间安全风险的防范。     

招商引资要重视科技的引领作用

招商引资工作,各级党委政府都高度重视,始终坚持发展为第一要事,以招商引资为第一要务。招商引资带动了地方经济与社会发展,加速了工业化、城镇化的进程,成绩是巨大的。在肯定成绩的同时,应该看到招商引资工作在不少地方确实也存在以牺牲资源环境为代价,过分追求GDP,重“量”轻“质”的问题,忽视了科技在产业发展中的作用,代价是惨痛的。本文以“招商引资要重视科技的引领作用”为题,阐述了招商引资与科技及产业的关系：招商引资促使了产业的转移,科技进步推动了产业发展。     

浅谈审计机关对固定资产投资的审计

我国已加入WTO，许多经济法规将加以修正。对固定资产投资的审计，也势必面临新的形势，需要我们认真总结以往的经验，继续为社会主义市场经济的发展发挥国家审计机关的职能。     

Socioeconomic status and receptive vocabulary development: Replication of the parental investment model with Chilean preschoolers and their families

Drawing on the first wave of data from the Chilean Longitudinal Study for Early Childhood the current study examined the relation between family socioeconomic status (SES) and children's receptive Spanish vocabulary, and whether these relations were mediated by physical features of the home environment, parent–child interactions, and participation in center-based child care. The results of path analyses (n = 1589) estimating direct and indirect effects of SES on children's receptive vocabulary test scores provided evidence of partial mediation through indices of standard of living and parents’ level of cognitive and linguistic stimulation in the home. This study is among the first to replicate with a non-U.S. sample, a well-established linkage among SES, family-level conditions and processes, and young children's language outcomes.     

老工业基地甘肃省人力资本状况及问题的实证研究

本文利用可得到的数据,在对会计成本法进行改进的基础上,对我国老工业基地——甘肃省1990-2002年期间的人力资本状况进行了估算,比较分析了其人力资本投资/存量、人力资本形成效率及HC-GDP规模调适指数等,发现和指出了其人力资本状况存在着老工业基地具有代表性的问题,从而得出其未来的人力资本发展战略和政策措施。     

签订外商投资企业合同应注意的几个法律问题

对当前外商投资企业合同履行中存在的问题作了分析，并对如何预防这些问题的出现，尤其是作为合营、合作者的中方在签订合同时如何预防作了探讨，并阐明了自己的观点。     

职业体育俱乐部投资环境分析

运用文献资料、调查访问、综合分析等方法,对我国职业体育俱乐部投资环境进行了探讨和研究,认为,从宏观环境和微观环境来看,我国职业体育俱乐部投资环境主要包括政治环境、经济环境、市场环境、人力资源环境等4个基本要素.目前,我国在职业体育俱乐部投资环境方面还存在许多缺陷,为了保护我国职业体育俱乐部投资主体的利益,促进职业产业化的良性发展,应加大对我国职业体育俱乐部投资环境政策支持力度,营造良好职业俱乐部投资环境.     

重庆市固定资产投资与经济增长的实证研究

本文利用计量经济学方法对重庆1990年-2005年GDP及固定资产投资两个时间序列数据进行了Granger因果检验、协整检验及误差修正模型分析。实证结果表明重庆的GDP和固定资产投资存在双向因果关系,且两者存在长期协整关系和短期动态调整机制,这对于判断重庆投资政策的作用效果有重要意义。