Learning design and technology through social networks for high school students in China

The subject of design and technology was introduced to the curriculum for high schools in China 10 years ago. However, the teaching and learning of this subject have become difficult for both teachers and students because there is a lack of qualified teachers with design background to deliver this subject in a way to stimulate the learning interests of the students. This paper presents a research that is aimed at improving this situation by integrating the teaching and learning of design and technology within a computational environment as part of social networks sites. The purpose is to enable the collaboration among the students and interaction between teachers and students. In this research, a series of investigations were conducted, by following through several taught subjects in design and technology in prominent high schools in China. Based on these investigations, a theoretical framework for web-based design learning and teaching system in the style of social networking is developed, implemented and tested, emphasizing three features of design: innovation, collaboration, and interaction. This framework has been tested among high school students and teachers in a high school in Nanjing. It identified and validated necessary techniques and design features required to make an education-related social networking site effective and affective for the students and teachers. The results of this research indicated that social networking sites have significantly positive values in design education, especially for the collaboration and interaction on the subject of design and technology.     

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我军海上战略投送能力建设思考

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试述信息化在企业的实践

本文从企业的实际情况出发,在用户需求分析的基础上,提出企业办公信息化系统的基本目标,并阐述系统的结构设计和功能设计,给出了一个基于B/S和Web技术的企业级办公信息化系统实例,对企业信息化管理的发展、应用具有实践意义。     

应对政府投资建设项目材料设备采购风险的措施及办法

政府投资建设项目材料设备采购风险主要有七种,就此提出应对措施。     

初中生与家长沟通现状调查研究

通过对太原两所中学部分初中生进行的初中生与家长沟通状况调查研究发现,初中生与家长沟通频率普遍比较低,沟通内容单一,针对某一问题的探讨不能深入。并且大多数学生认为家长对自己的干涉较多,要求太高。对此提出了通过树立正确的教育观,增进理解,掌握沟通的技巧,创造轻松愉快的学习生活空间,全面改善沟通状况的对策建议。     

比较中外学生学习状况对我国高校学风建设的启示

为了提高教学和人才培养质量,营造良好的育人氛围,无论是国内还是国外高校,都十分重视学风建设。但在实际调研过程中发现,国内外高校学生受国家体制、社会影响、个人心理等因素影响,学习状态及动力也各不相同。本文认为,要从客观的角度去看待调研结果,取之精华、去其糟粕,积极开展我国高校思想教育,激励学生成才的主观能动性,使我国高校的学风建设迈向新的高峰。     

健身运动与心理训练

健康问题越来越成为社会关注的焦点,健身运动如何促进心理健康这一课题已经成为学界的热门研究领域,引起心理学、体育学、医学等相关学科的关注。随着这一领域研究的不断深入,我们会更深的理解体育运动的价值,探索出更加有效的研究方法和手段。     

未来房地产网络营销在线交易模式

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Dispersive ordering of fail-safe systems with heterogeneous exponential components

Let X ₁, . . . , X _n be independent exponential random variables with respective hazard rates λ₁, . . . , λ _n , and Y ₁, . . . , Y _n be independent and identically distributed random variables from an exponential distribution with hazard rate λ. Then, we prove that X _2:n , the second order statistic from X ₁, . . . , X _n , is larger than Y _2:n , the second order statistic from Y ₁, . . . , Y _n , in terms of the dispersive order if and only if

$\lambda\geq \sqrt{\frac{1}{{n\choose 2}}\sum_{1\leq i < j\leq n}\lambda_i\lambda_j}.$

We also show that X _2:n is smaller than Y _2:n in terms of the dispersive order if and only if

$ \lambda\le\frac{\sum^{n}_{i=1} \lambda_i-{\rm max}_{1\leq i\leq n} \lambda_i}{n-1}. $

Moreover, we extend the above two results to the proportional hazard rates model. These two results established here form nice extensions of the corresponding results on hazard rate, likelihood ratio, and MRL orderings established recently by Pǎltǎnea (J Stat Plan Inference 138:1993–1997, 2008), Zhao et al. (J Multivar Anal 100:952–962, 2009), and Zhao and Balakrishnan (J Stat Plan Inference 139:3027–3037, 2009), respectively.