共查询到7条相似文献,搜索用时 31 毫秒
1.
经过多年在对黄土高原小流域进行攻关研究的基础上,认为在黄封上流域综合整治的过程中的存在着几个较为重要的矛盾,只有认识和处理好这些矛盾的相关关系,黄土高原小流域综合整治的理论与实践才可趋于完善,整治的成果才可得以巩固。 相似文献
2.
The DINA model is a commonly used model for obtaining diagnostic information. Like many other Diagnostic Classification Models (DCMs), it can require a large sample size to obtain reliable item and examinee parameter estimation. Neural Network (NN) analysis is a classification method that uses a training dataset for calibration. As a result, if this training dataset is determined theoretically, as was the case in Gierl’s attribute hierarchical method (AHM), the NN analysis does not have any sample size requirements. However, a NN approach does not provide traditional item parameters of a DCM or allow for item responses to influence test calibration. In this paper, the NN approach will be implemented for the DINA model estimation to explore its effectiveness as a classification method beyond its use in AHM. The accuracy of the NN approach across different sample sizes, item quality and Q-matrix complexity is described in the DINA model context. Then, a Markov Chain Monte Carlo (MCMC) estimation algorithm and Joint Maximum Likelihood Estimation is used to extend the NN approach so that item parameters associated with the DINA model are obtained while allowing examinee responses to influence the test calibration. The results derived by the NN, the combination of MCMC and NN (NN MCMC) and the combination of JMLE and NN are compared with that of the well-established Hierarchical MCMC procedure and JMLE with a uniform prior on the attribute profile to illustrate their strength and weakness. 相似文献
3.
"监控社会"的不断扩张已经成为一个世界性现象,其社会心理根源在于政府、市场和媒体三方联合操纵民众的恐惧情绪。其中,政府把民众的忧虑从系统性风险转移到恐怖主义和犯罪行为上,通过"转移恐惧"巩固了政治合法性;市场通过"夸大危险"和形塑"孤立的个人"来"塑造无能感",进而催生了日益增长的监控产品需求;媒体则通过刻画"可见又不可辨的他者"形象来"制造危险",从而吸引受众的眼球。但是,通过监控来缓解恐惧绝非治本之策,因为它最多只不过是一笔不划算的"恐惧交换",即用人们对监控者的恐惧(人造恐惧)取代人们对他者、对危险的恐惧(自然恐惧)。 相似文献
4.
人力资本理论在客观上回答了科技进步推动下社会经济增长的源泉问题.本文从历史的角度对人力资本理论进行了研究和探讨,着重对人力资本作用机制的作用环境、人力资本的外部效应和人力资本投资进行了分析,以期探讨人力资本作用机制有效实施的路径. 相似文献
5.
6.
本文从人类认知方式转变以及现代社会形成的角度,探讨了人类发展所面临的现实和潜在问题,通过对现代社会体系的分析,指出了可持续发展理论所体现出的本质内涵,即发展价值的转变。并要求重估理性和技术的价值。使发展体现出人的存在意义。而不只是技术进步与物质财富的增长。 相似文献
7.
和谐社会的经济理论:当代经济学问题的人性解析 总被引:1,自引:0,他引:1
和谐社会的建设需要知识的和谐.本文从人性的角度对当代经济学知识进行扫描,找到其不和谐之处并尝试以人的辩证的利益假设作为和谐经济知识建构的基础,提出了经济生活的利益相容论、经济成长的知识自由论、经济主体的理性利益论和经济运行的文化决定论. 相似文献