A Vocabulary Learning Tool for L2 Undergraduates Reading Science and Technology Textbooks

Students of English as a second language who major in science and technology use English-language textbooks to ensure that they can read English materials upon graduation. Research indicates that teachers spend little time helping these students on the linguistic complexity of such textbooks. Vocabulary, grammar, and article structure are elements of this complexity, but to many students, these elements can be akin to locked doors. This study presents MyVLS-Reader, which focuses on unlocking the first of these doors—vocabulary—while assisting in reading. With explicit vocabulary learning, students learn and memorize individual vocabulary, but the context is lost if the depth of learning discards context. In implicit vocabulary learning, students acquire vocabulary through repeated exposure to contexts, but repeated encounters with new words are required. Few e-learning systems combine both vocabulary-learning approaches. MyVLS-Reader achieves such synergy by (1) using a keyword setting to provide context-matched vocabulary explanation while reading and (2) embedding multiple learning choices, such as keyword setting, the review and memorization of explicit vocabulary, and the option to ask instructors. This study includes two rounds of evaluations: (1) an evaluation of the learning achievements of control and treatment groups and (2) a quantitative and qualitative investigation of perceptions regarding the use of MyVLS-Reader. The evaluation results indicate that the treatment group developed a better vocabulary than the control group in significantly less time. The use of MyVLS-Reader also slightly improved higher-order thinking skills. This result suggests that MyVLS-Reader can effective assist students in building their vocabulary while reading.     

The educational expectations of Italian children: the role of social interactions with the children of immigrants

This paper aims to investigate to what extent the growing presence of children with immigrant background in the Italian school system has an impact on the educational expectations of Italian students in eighth grade. Educational expectations are individuals’ plans for their future educational career, adjusted to the subjectively estimated probabilities of achieving a given outcome. Multilevel analyses are performed using data from ITAGEN2 (Italian Second Generation) survey, the first nationwide survey on natives, first- and second-generation immigrants. Results demonstrate that attending a school with a high proportion of children of immigrants has no impact on realistic expectations about secondary education. In addition, students attending schools with high level of interethnic integration are more prone to having high educational expectations.     

一种蜂窝网络中支持D2D通信的资源分配方法

基于冲突图模型形成的二进制整数规划,提出了一种蜂窝网络中支持D2D通信的无线资源分配方法．首先,提出一种频率资源分配算法,即为每个D2D链路都分配一个频率资源块．分配频率资源时将尽可能地利用蜂窝网络中的无线频率资源空间重用机会．然后,提出一种时隙调度算法,即为所有分配同一频率资源块的D2D链路进行时隙资源调度．调度时隙资源时将保证使用同一频率资源块的D2D链路之间达到长期平均吞吐率的比例公平．通过计算机仿真对所提出方法的性能进行了验证,结果表明该方法能够在蜂窝网络中实现D2D通信功能．     

Classroom conditions to secure enjoyment and achievement: the pupils' voice. Listening to the voice of Every child matters

This paper argues that pupil voice and the active engagement of pupils in shaping their own educational experience are integral to the success of the ‘Enjoy and Achieve’ strand of the Every child matters: Change for children programme. Through accessing the voice of Key Stage 2 pupils, insight was gained into what pupils believe to be the ideal ‘classroom conditions’ which enable them to enjoy and achieve at school. Pupil voice was accessed using an innovative form of group interview incorporating an Ishikawa or fishbone tool. The data was collected from 180 pupils, from Years 3–6 (aged 7–11) in a UK Junior school. The findings identify eight ‘classroom conditions’ which pupils see as being critical for them to be able to enjoy and achieve at school. Two of these ‘classroom conditions’ do not appear to be supported by previous research.     

基于J2EE平台的网络辅助教学系统的设计与构建

本文介绍了J2EE体系结构和技术框架,研究了网络辅助教学系统的实现目标及网络教学平台构建的策略。     

浅析P2P技术

P2P技术打破了传统的C/S模式,在网络中的每个结点的地位都是对等的,每个结点既充当服务器,为其他结点提供服务,同时也享用其他结点提供的服务。介绍了P2P技术的概念,并详细描述了P2P技术的具体应用以及所面临的问题。     

数字压缩技术在远程视频传输中的应用

随着互联网技术的发展与普及,如何利用这一低成本资源来实现数字视频的远程传输,值得我们认真考虑,通过实践应用阐述了采用多格式数字压缩技术.通过基于互联网的ftp进行传输接收、编码和解码的全面过程解决方案.     

电催化氧化对罗丹明B脱色效果的研究

以Ti/MnO2/PbO2电极作为阳极,在无隔膜的电解槽中对罗丹明B模拟废水进行了电催化氧化脱色的研究.探讨了支持电解质(Na2SO4)浓度、电流密度、罗丹明B初始浓度、支持电解质NaCl等因素对罗丹明B脱色的影响.研究结果表明:增加电流密度、提高电解质浓度有利于罗丹明B色度的脱除,相同条件下,溶液浓度越低,罗丹明B的电催化脱色效果越好.     

P2P流媒体系统中积分检测相结合的激励机制

许多基于P2P方式的流媒体协议都假设节点是合作的,而没有考虑到存在自私节点的问题。本文提出了P2P流媒体系统中一种积分检测相结合的激励机制。节点通过自身或子节点共享数据流获得贡献积分,贡献积分越高,节点获得数据流的优先权就越高;为了贡献积分最大化,节点有选择地对它的子节点进行检测来促进子节点数据的共享,从而提高整个系统的性能。分析和模拟实验表明使用该机制能解决长期历史积分问题,提高合作者比例,并维护了较高的系统性能。