Rate-distortion optimized frame dropping and scheduling for multi-user conversational and streaming video

INTRODUCTION Video packets are transmitted over the Internet using a best-effort service. Therefore, a large number of simultaneous video streams or cross traffic arriving at a network node (e.g. a multimedia gateway) may sometimes exceed the node’s forwarding capacity, i.e., the incoming data rate may exceed the outgoing data rate at the node. In this paper, we consider a scenario where M streaming videos and N conversa- tional videos pass through a network node with lim- ited forwardi…     

The effects of computer-supported self-regulation in science inquiry on learning outcomes,learning processes,and self-efficacy

Recently, researchers have demonstrated the benefits of technology-enhanced science inquiry activities. To improve students’ self-regulation and assist them in controlling their own learning pace through inquiry activities, in this study, a self-regulated science inquiry approach was developed to assist them in organizing information from their real-world exploration. A quasi-experimental design was conducted in an elementary school natural science course to evaluate the students’ performance using the proposed learning approach. One class assigned as the treatment group learned with the self-regulated science inquiry approach, while the other class assigned as the control group learned with the conventional science inquiry approach. The students’ learning achievement, tendency of information help seeking, tendency of self-regulation, and self-efficacy were evaluated. The results of the study revealed that the self-regulated science inquiry approach improved the students’ learning achievement, especially for those students with higher self-regulation. In addition, the students who conducted inquiry with the self-regulated learning strategy increased their tendency of information help seeking, self-efficacy, and several aspects of self-regulation, including time management, help seeking, and self-evaluation. Accordingly, this study demonstrated the effectiveness of the self-regulated learning strategy, an approach with high learner control, in terms of improving students’ learning achievement and their self-regulation.     

综合实训教学资源开发利用现状及对策研究——以财经类高校为例

财经类高校由于专业之间耦合度高,关联度大,综合实训教学资源建设和利用中存在的问题尤为突出.首先从师资力量 、 实训基地平台,以及实训资源整合力度三个方面,对财经类高校综合实训教学资源开发利用过程中所存在的问题进行分析,在此基础上,从实践教学体系 、 双师型师资队伍以及整合实训平台三个方面提出了相关对策建议.     

试论高校领导干部的文学修养

高校领导干部的文学修养,是高校领导干部综合素质的重要组成部分,可以毫不夸张地说,一位不具备文学修养的高校领导干部,起码称不上是一位完整意义上的高校领导者。     

西部农村地区教师专业发展的个案研究——以重庆市北碚区为例

笔者通过质性研究对重庆市北碚区小学教师专业发展情况进行了调查,分析了作为当前促进西部农村地区教师专业发展有效途径之一的教师培训存在的普遍问题,并在此基础上建构了针对西部农村地区教师培训的基本框架,以期为解决西部农村地区教师培训中存在的问题提供一个基本的思路和方向。     

Counterintuitive effects of online feedback in middle school math: results from a randomized controlled trial in ASSISTments

This study compared the effects of three different feedback formats provided to sixth grade mathematics students within a web-based online learning platform, ASSISTments. A sample of 196 students were randomly assigned to one of three conditions: (1) text-based feedback; (2) image-based feedback; and (3) correctness only feedback. Regardless of condition, students solved a set of problems pertaining to the division of fractions by fractions. This mathematics content was representative of challenging sixth grade mathematics Common Core State Standard (6.NS.A.1). Students randomly assigned to receive text-based feedback (Condition A) or image-based feedback (Condition B) outperformed those randomly assigned to the correctness only group (Condition C). However, these differences were not statistically significant (F(2,108) = 1.394, p = .25). Results of this study also demonstrated a completion-bias. Students randomly assigned to Condition B were less likely to complete the problem set than those assigned to Conditions A and C. To conclude, we discuss the counterintuitive findings observed in this study and implications related to developing and implementing feedback in online learning environments for middle school mathematics.     

浅析D.H.劳伦斯的自然观

简述劳伦斯自然观的内容，分析其形成原因并着重就劳伦斯的三部小说《白孔雀》，《虹》及《查泰莱夫人的情人》进行分析，展示劳伦斯自然观，从而得出结论：从根本上说，劳伦斯相信人与自然之间存在着活生生的联系，提倡两者的和谐共处。     

“教学做合一“的实践性特征与对知识的透彻理解

“教学做合一”的显著特征是它的实践性。“做”是教学的中心 ,理解“做”的含义是正确理解“教学做合一”的前提。陶行知赋予“做”如此重要地位源于对知识的透彻理解 ,他对知识的分类和对“亲知”的重视表明他对知识的研究与当代理论前沿相近。他在知识论领域的探索对今天的教学改革至少有三点启示 :纠正“几乎以‘闻知’概括一切知识’ ,学校只是传授知识场所的错误观点 ,正视和肯定默会知识在教学中的重要价值 ;克服教学只是教师“一言堂”的习惯 ,而应是师生及同学之间“教学做合一”的生动过程 ;改变课堂教学与实践教学相脱离的错误做法。“教学做合一”正是实现课堂教学与实践教学紧密结合 ,培养学生创新精神和实践能力的有效途径。     

建立独立税务会计的思考

随着经济体制改革的不断推进及我国加入WTO、税法税制的不断健全和会计职能的变革，借鉴一些发达国家的经验，建立独立税务会计，使税务会计与财务会计相分离越来越成为必要。