Network-adaptive HD MPEG-2 video streaming with cross-layered channel monitoring in WLAN

INTRODUCTION Video streaming service nowadays enjoys ex- plosive adoptions over all kinds of underlying net- works. To enjoy the freedom of tether-less connection over the wireless local area network (WLAN), we need to overcome many challenges of unstable wire- less channel due to fading, interference and so on. The scarce and fluctuating available bandwidth (together with time-varying delays and random/burst losses) can cause the video quality at the streaming client to be seriously deg…     

Teaching about complex systems is no simple matter: building effective professional development for computer-supported complex systems instruction

The recent next generation science standards in the United States have emphasized learning about complex systems as a core feature of science learning. Over the past 15 years, a number of educational tools and theories have been investigated to help students learn about complex systems; but surprisingly, little research has been devoted to identifying the supports that teachers need to teach about complex systems in the classroom. In this paper, we aim to address this gap in the literature. We describe a 2-year professional development study in which we gathered data on teachers’ abilities and perceptions regarding the delivery of computer-supported complex systems curricula. We present results across the 2 years of the project and demonstrate the need for particular instructional supports to improve implementation efforts, including providing differentiated opportunities to build expertise and addressing teacher beliefs about whether computational-model construction belongs in the science classroom. Results from students’ classroom experiences and learning over the 2 years are offered to further illustrate the impact of these instructional supports.     

Academic Language Instruction for Students in Grades 4 Through 8: A Literature Synthesis

Academic language, which is characterized by the words and structure of the language of schooling, is an important teachable component of academic achievement. When compared to other strong predictors of academic achievement (e.g., decoding, fluency, vocabulary, comprehension), academic language is not as well understood or explicitly taught in schools. The purpose of this literature synthesis is to identify the instructional practices that currently have the best evidence to improve academic language and broader academic achievement outcomes. The most prolific study of academic language instruction occurs with English learner samples. In the current study, we sought high-quality empirical intervention studies conducted with English learners. We describe the components of instruction that explicitly address academic language skills, and we describe the impact on outcomes for English learner students as well as their English-only peers.     

Phases and patterns of group development in virtual learning teams

With the advancement of Internet communication technologies, distributed work groups have great potential for remote collaboration and use of collective knowledge. Adopting the Complex Adaptive System (CAS) perspective (McGrath, Arrow, & Berdhal, Personal Soc Psychol Rev 4 (2000) 95), which views virtual learning teams as an adaptive and self-organizing entity, this study examined group development processes of seven intact virtual learning teams over 12 weeks using the multiple case study design. Content analysis revealed seven temporal group development phases: orientation, scheduling, exploration, work and decision, progress check and evaluation, refinement and formatting, and termination. The development pattern of each virtual learning team could be described as either Linear Progression, a straight movement through those phases, or Adaptive Progression, a backward movement to a previous phase for adaptation before proceeding. We also identify the factors that caused each team to develop in one way or the other and conclude with the implications of conceptualizing virtual teams as a CAS.     

Refining the Measure and Dimensions of Social Values of Older People (SVOP)

The research reported in this study concerns older adults from Australia who voluntarily chose to learn the craft of woodturning. The paper examines the literature of adult learning under the themes of presage factors, the learning environment, instructional methods, and techniques for facilitators. The paper then reports on the analysis of two sections of a questionnaire completed by 123 respondents: the first on motivation to learn and the second on learning strategies. The older learners reported using both intrinsic and extrinsic motivation, with intrinsic motivation constructed of both general and specific elements. There were four main learning strategies used: actively seeking knowledge, independent learning, dependent learning, and passively seeking knowledge.     

Own Group Oppression, Other Group Oppression, and Perspective Taking

This survey research examined the relationship of awareness of own versus awareness of other group oppression across sexism, racism, and homonegativity, by including perspective taking (PT) as a moderator. Hierarchical multiple regression analyses indicated that awareness of sexism (own group oppression) predicted awareness of racism (other group oppression) in a sample of 116 European American females (Study 1), whereas awareness of racism (own group oppression) did not predict awareness of homonegativity (other group oppression) in a sample of 113 U.S. racial minorities (Study 2). High PT, compared to low PT, did not predict a stronger relationship between awareness of own and awareness of other group oppression. Post-hoc speculation on the role of PT in intergroup relations and implications for research and counseling are discussed.