新媒体艺术教育的现状与思考

新媒体艺术是20世纪末数字技术与艺术的结合而引发的一个崭新的交叉课题,是真正的艺术与科学相结合的学科。目前高校新媒体艺术专业存在着一些不合理的因素,可以借鉴国外的经验和做法,加强和改善新媒体艺术教育。     

Elementary Teachers’ Perception of Language Issues in Science Classrooms

Although the importance of language in science learning has been widely recognized by researchers, there is limited research on how science teachers perceive the roles that language plays in science classrooms. As part of an intervention design project that aimed to enhance teachers’ capacity to address the language demands of science, interview data (N = 9) were collected to understand teachers’ perceptions and experiences with a wide range of issues related to language use in science classrooms. Adopting an interpretive approach to qualitative data, the analysis revealed that the teachers perceive a wide range of student difficulties related to language use in science classrooms, especially to the use of specialized terms and writing. Although the teachers are keenly aware of how language can be a barrier to learning science, they are less certain as to what students need to know about the language of science in order to master it. The findings suggested professional support that highlights the distinctive language demands of science and how these demands differ from other subject areas could be useful to these elementary school teachers.     

《汽油机工作原理》模拟实验的设计与实现

Authorware已经广泛用于多媒体教学课件的开发中.本文介绍了利用Authorware6.0制作汽油机吸气、压缩、做功和排气四个冲程不断循环工作的动画过程,并用对比的方式,使学生对各个冲程工作的过程、现象、原理有清楚的认识,课件形象、直观地再现了真实的实验环境.通过设计练习题等形式,增加了课堂教学信息量,使学生在有限的时间内获得了最佳的教学效果.该课件不仅解决了教学难点,也激发了学生学习的兴趣,还可通过Internet网络直接用于远程教学.     

Characteristics of an innovative learning environment according to students’ perceptions: actual versus preferred

An innovative learning environment is the current outcome of the constructivist approach, the essence of which is co-construction of knowledge in an Information and Communication Technology (ICT) environment. We examined how Israeli students perceived 10 characteristics of their classroom learning environment—student cohesiveness, teacher support, involvement, task orientation, investigation, cooperation, equity, differentiation, computer usage and young adult ethos. Particular foci were students’ perceptions of the actual state of their learning environment compared with the preferred state, and which characteristics predicted students’ cooperation. Participants were 1022 students in 33 classes from 12 computerised elementary and middle schools in Israel. Data were collected using the Technology-Rich Outcomes-Focused Learning Environment Inventory (TROFLEI). Results indicated a gap between the actual and the preferred states for all characteristics, although the scope of these gaps differed between elementary-schools students and middle-school students for certain characteristics. Structural equation modelling (SEM) analysis indicated that nine characteristics of the innovative environment in both actual and preferred states were related to cooperation, with these relations being primarily direct with the exception of teacher support and differentiation which had an indirect influence. Teacher support was mediated through student cohesiveness, involvement, equity and young adult ethos, whereas differentiation was mediated through investigation. Evaluation of the innovative learning environment might lead to better insights regarding the behaviours and needs of twenty-first century students in Israel’s education system. These insights could advance constructivist processes and teaching methods and bring the students to effective cooperative learning in an innovative learning environment.     

Educational inequality in Tasmania: evidence and explanations

In this article, we map the extent of educational inequality within Tasmania, and between Tasmania and the rest of Australia, using National Assessment Program—Literacy and Numeracy (NAPLAN) and senior secondary attainment data. This analysis yields some surprising findings, showing the success of Tasmanian primary and high schools and that Tasmanian educational inequality is most strongly expressed at the senior secondary level. We conclude that using such publicly available data to identify differential achievement within and between jurisdictions would strengthen public policy and practitioner interventions aimed at achieving more equal educational outcomes for students in all schools. Our findings also have implications for research directions in this field, suggesting that by analysis of NAPLAN and My School data across individual schools and jurisdictions academic researchers could assist practitioners gain a deeper understanding of inequalities reproduced by the systems they are working within, while finding examples of schools and systems which show a greater level of success in ameliorating disadvantage.     

一种流媒体Caching策略

It is expected that by 2003 continuous media will account for more than 50% of the data available on origin servers, this will provoke a significant change in Internet workload. Due to the high bandwidth requirements and the long-lived nature of digital video, streaming server loads and network bandwidths are proven to be major limiting factors. Aiming at the characteristics of broadband network in residential areas, this paper proposes a popularity-based server-proxy caching strategy for streaming media. According to a streaming media popularity on streaming server and proxy, this strategy caches the content of the streaming media partially or completely. The paper also proposes two formulas that calculate the popularity coefficient of a streaming media on server and proxy, and caching replacement policy. As expected, this strategy decreases the server load, reduces the traffic from streaming server to proxy, and improves client start-up latency.     

International orientierte höhere Schulen in Deutschland – Zwei Varianten von Internationalität im Wechselspiel von Institution und Schülerbiografie

During the last decades, the education system has been marked by distinct processes of internationalisation. In the field of higher education, there are numerous and varied schools with different international profiles. This paper focuses on processes of internationalisation in the German sector of higher education. We contrast two higher secondary schools with international profiles: one international school in a West German metropolitan region with a long tradition and a younger internationally-profiled school located in the periphery of an East German urban centre. This institutional analysis presents school cultural similarities and differences with regard to different claims and concepts of internationality. This analysis is complemented by a reconstruction of three patterns of biographical meaning examining the internationality of pupils and their respective habitual fit to these internationally-profiled schools. We draw on qualitative data, consisting mainly of interviews with head teachers and pupils of these two schools. We argue that these differing regional forms of internationalisation indicate a stratification and hierarchisation in the field of higher education in Germany.     

Modeling of D-STATCOM in distribution systems load flow

This paper presents modeling of Distribution STATCOM (D-STATCOM) in load flow calculations for the steady- state voltage compensation. An accurate model for D-STATCOM is derived to use in load flow calculations. The rating of this device as well as the direction of required reactive power injection for voltage compensation in the desired value (1 p.u.) is de- rived and discussed analytically and mathematically by the phasor diagram method. Furthermore, an efficient method for node and line identification used in load flow calculations is presented. The validity of the proposed model is examined by using two standard distribution systems consisting of 33 and 69 nodes, respectively. The best location of D-STATCOM for under voltage problem mitigation approach in the distribution networks is determined. The results validate the proposed model for D- STATCOM in large distribution systems.     

减少不确定性与含糊交际理论在交际中的运用

语言交际是一种复杂的人类言语行为,交际者根据交际目的、环境,对象以及各种随机因素的交互作用而作出言语决策.语言交际策略的使用不但要遵循顺应理论的原则,而且还受元语言意识的影响.减少不确定性和含糊交际,作为大家经常使用的交际策略,它们的最终目的都是实现信息的交换,满足交际者的需求,顺利完成交际任务.