Academic Self-Concepts in Ability Streams: Considering Domain Specificity and Same-Stream Peers

The study examined the relations between academic achievement and self-concepts in a sample of 1,067 seventh-grade students from 3 core ability streams in Singapore secondary education. Although between-stream differences in achievement were large, between-stream differences in academic self-concepts were negligible. Within each stream, levels of students’ achievement and their self-concepts were systematically related only when considered in the matching academic domain and the appropriate level of specificity. In English, lower achievers in the high-ability stream tended to underestimate their achievement, whereas higher achievers in the low-ability stream tended to overestimate their achievement. This pattern, however, was not evident in mathematics and the general academic domain. Taken together, the findings highlight the importance of considering the interplay of domain specificity and same-stream peers in academic self-concepts.     

Ability Grouping——Learners' and Teachers' Perception at Chinese Universities

This study showed that difference in students’perceptions toward ability grouping existed.Even though teachers and scholars expected that ability grouping could help students to become more positive motivated and satisfied with studying in the class thus narrowing the gap between advanced and beginning level students,there were still problems showing that ability grouping should be modified.     

高校图书馆流媒体信息服务模式初探——以南京地区部分高校实践为例

高校图书馆流媒体信息服务的构成要素包括人、资源、技术和服务等方面。本文通过对南京地区部分高校流媒体信息服务的实际调研分析,初步探讨了高校图书馆流媒体信息服务的基本模式。     

一个在数据流上快速建立决策树的算法

决策树分类器是一个重要的数据挖掘问题，在数据流上建立决策树的关键问题是如何计算内部节点的最佳分裂标准。现有的算法有的不能处理数值型的属性，有的计算代价太高。本文采用将数值型的属性值分成适当的区间，根据它们gini index值的特殊性质，确定具有最大gini indes梯度的区间，因而可以快速地计算最佳分裂点，实现在流数据上快速地建立决策树。     

Unequal Forced-Intra-Refresh for robust video streaming

INTRODUCTION In the encoding or transcoding of video stream- ing, intra refresh is introduced as a non-normative error-resilience tool. Although the intra-refresh schemes based on the rate-distortion optimization (C?té et al., 2000; Stockhammer et al., 2002) are superior to the early heuristic intra-refresh strategies, these new schemes cannot yet accurately estimate the video distortion due to time-varying packet losses, and usually ignore the inter-frame error-propagation effect. Chiou…     

流媒体技术在《语文基本能力训练》网络课件中的应用

流媒体技术在网络课件中的应用使教学课件丰富了表现力。本介绍流媒体技术，并结合我们目前制作的网络课件，讨论了网络课件如何应用流媒体技术。     

基于流媒体技术的现代远程教学系统设计综述

现代远程教育教学是现代信息技术与教育技术的完美融合，是学习型社会开放、灵活的一种新型教学模式。基于流媒体技术的现代远程教学系统弥补了远程教育中多媒体信息传输的诸多不足。文章介绍了现代远程教育的相关概念和流媒体技术的相关知识，给出了基于流媒体技术的现代远程教育教学系统设计基本框架，展示了基于流媒体支持下远程教学发展趋势。     

流媒体技术在电子商务信息发布中的应用

在电子商务活动中，信息交流的有效程度直接关系到电子商务的成败，对商品信息的发布是电子商务活动中商家的重要信息行为。本文首先对目前电子商务中信息发布的基本方法进行了分析和比较，然后阐述了视音频流信息是电子商务活动中信息发布的重要形式之一，并重点介绍分析了流媒体技术体系以及电子商务活动中视音频流信息的发布。     

合理把握高等教育分流时机——比较借鉴德国经验

试就德国传统的学术性大学、高等专科学校和职业学院等高等院校内部或之间分流的时间和次数进行分析,从而得出对中国高等教育分流的启示。     

Equation based rate control scheme for video streaming over wireless channels with link level ARQ

INTRODUCTION Video streaming applications generally require continuous high bandwidth guarantees as well as stringent bounds on delays and jitters (Shen et al., 2004; Hassan and Krunz, 2004). Providing video streaming with acceptable quality degradation over wireless channels is fraught with challenges due to the adverse influence of bandwidth limitation, time variation, high error rate, and so on (Etoh and Yo- shimura, 2005; Shen et al., 2004; Chen and Zakhor, 2004; Hassan and Krunz, …