制约中小学课堂运用教育技术的因素分析——美国中小学现代教育技术实施环境调查报告

通过对美国中小学教师进行问卷、访谈调查,研究目前制约中小学课堂教学中运用现代教育技术的几个因素.调查结果表明:教师时间缺乏、电脑网络技术问题得不到及时解决是阻碍教师课堂运用现代教育技术的主要障碍.进一步探索美国城乡之间、年级之间现代教育技术运用的环境是否存在差异,结果显示:郊区学校现代教育技术环境比城市和乡村好,但年级之间无显著差异.     

SP口头反馈对医学生OSCE成绩影响初探

方法:将考生随机分为两组,实验组先进入有SP反馈的长站,再进入没有SP反馈的短站;时照组先进没有SP反馈的短站,后进入有SP反馈的长站.同时使用问卷调查学生对SP反馈的正确性和帮助大小的看法.结果:对照组和实验组的SP短站成绩差异无显著性,第一SP长站和第二SP长站间的成绩差异有显著性.问卷调查结果显示,90%的学生积极评价SP反馈.结论:SP反馈有助于提高相同结构和相同任务站点的成绩,但对于不同结构不同任务站点的成绩影响还需要进行更严格的设计的研究.     

A case of vitamin B12 deficiency neurological syndrome in a young adult due to late-onset cobalamin C (CblC) deficiency: a diagnostic challenge

Vitamin B12 deficiency can present with neurologic and psychiatric symptoms without macrocytic anaemia. We describe a case of late-onset cobalamin C deficiency which typically presents with normal serum vitamin B12 concentrations, posing an additional diagnostic challenge. A 23-year-old woman with decreased muscle strength and hallucinations was diagnosed with ‘catatonic depression’ and admitted to a residential mental health facility. She was referred to our hospital for further investigation 3 months later. Heteroanamnesis revealed that the symptoms had been evolving progressively over several months. Magnetic resonance imaging (MRI) of the brain showed diffuse symmetrical white matter lesions in both hemispheres. Routine laboratory tests including vitamin B12 and folic acid were normal except for a slight normocytic, normochromic anaemia. Over the next 6 weeks her symptoms deteriorated, and she became unresponsive to stimuli. A new MRI scan showed progression of the white matter lesions. The neurologist requested plasma homocysteine (Hcys) which was more than 8 times the upper limit of normal. Further testing revealed increased methylmalonic acid and the patient was diagnosed with adult-onset cobalamin C deficiency. This case illustrates that Hcys and/or methylmalonic acid should be determined in patients presenting with neuropsychiatric symptoms suggestive of vitamin B12 deficiency with a normal serum vitamin B12 to rule out a late-onset cobalamin C deficiency.     

儿童焦虑与父母教养方式关系的调节变量研究

研究综合了来自中国大陆18570名3-12岁儿童的焦虑与父母教养方式相关的30项研究的数据,通过元分析的方法考查了二者相关的强度,并分析影响相关强度的因素。从总体上来说,儿童焦虑与父母教养方式存在弱相关;父母教养方式类型、儿童年龄、父母性别会对二者关系产生调节作用。建议在教养儿童过程中要采用正向的教养方式,要给予年幼儿童充分的独立自主的权利和自由,鼓励父亲参与教养,这有利于降低儿童的焦虑水平。     

基于政策文本视角的广东“十二五”科技政策研究

基于"政策年度""政策类型""颁布主体"和"文种类型"四位一体科技政策分析框架,对广东"十二五"期间颁布的80项科技政策样本进行统计分析,系统阐述广东"十二五"期间科技创新政策的类型分布、主要特点和存在问题,并提出若干对策建议。     

2008年欧洲杯足球赛决赛阶段各队进攻进球特征研究

通过对2008年欧洲杯足球赛决赛阶段31场比赛的73个进球特征统计发现:下半场进球数高于上半场,全场比赛结束前15min是全场比赛进球最高峰;进球方式是以脚射为主,其中,抢点直接脚射进球率最高;由前场发动组织进攻进球率最高;进球射门主要区域集中在罚球区;球门下部是进球入门的主要区域,尤其从球门右下角区域进球率最高;各位置进球数最多的仍是前锋运动员;边路进攻进球数位居各进攻形式之首;进球前经过2次传球配合后射门进球数最多,随运动员之间传球配合次数增多破门得分机率减小。     

单片机AT89C52扩展USB接口实现

本文在介绍USB接口基础上,提出一种AT89C52扩展USB接口的实现方法。并指出由于USB接口使用方便、支持热插热拔,AT89C52扩展了USB功能有利于进一步拓展其应用,因而具有广阔的应用前景。     

基于博弈的SP分层管理

从博弈论的角度分析了移动运营商与SP之间的动态博弈过程。在理论分析的基础上,根据实际经验和相关数据修正了动态博弈结果,最终得出的结论是现实解是一个稳定的次优解。要达到最优解,运营商必须采取行动,激励SP创新。具体的行动则可以借鉴日本移动运营商DoCoMo对SP进行分层管理的成功经验,将SP分为四种类型,采取差异化对待策略。     

A review of Computer Science resources for learning and teaching with K-12 computing curricula: an Australian case study

To support teachers to implement Computer Science curricula into classrooms from the very first year of school, teachers, schools and organisations seek quality curriculum resources to support implementation and teacher professional development. Until now, many Computer Science resources and outreach initiatives have targeted K-12 school-age children, with the intention to engage children and increase interest, rather than to formally teach concepts and skills. What is the educational quality of existing Computer Science resources and to what extent are they suitable for classroom learning and teaching? In this paper, an assessment framework is presented to evaluate the quality of online Computer Science resources. Further, a semi-systematic review of available online Computer Science resources was conducted to evaluate resources available for classroom learning and teaching and to identify gaps in resource availability, using the Australian curriculum as a case study analysis. The findings reveal a predominance of quality resources, however, a number of critical gaps were identified. This paper provides recommendations and guidance for the development of new and supplementary resources and future research.     

第12届欧洲杯足球赛参赛各队技战术运用能力的综合评价

对第12届世界杯足球赛16支球队31场比赛的9项攻防指标进行Q聚类统计,并对各聚类指标的差异性进行方差分析和多重比较,运用等级相关法对聚类结果进行检验,表明应用Q型聚类对球队的各项指标进行量化评价具有较高的可靠性,结果客观反映了各队技战术综合实力.揭示了欧洲足球运动的发展趋势,并探索一种较合理有效的量化评价球队技战术能力的方法.