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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… 相似文献
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This study, analysing an entertainment-education drama's episodes and bulletin board messages about the episodes, explored the relationship between audience involvement and its antecedents. Episode topic and issue controversy were associated with parasocial interaction and reflection as well as behavioural responses (poll participation and message contribution). This study also found the possibility that entertainment-education interventions could be effectively executed by combining old media's entertainment and education function and cyber media's information and discussion forum providing function. 相似文献
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Berit Bae 《Early Years: An International Journal of Research and Development》2010,30(3):205-218
The UN Convention on the Rights of the Child has during recent decades influenced professionals and policy‐makers in Norway as well as in other countries, resulting in changes in documents regulating early childhood institutions. Little is known, however, about the way this right is understood and realized in everyday practice. How is the concept of participation understood by professionals in the field? What issues emerge as problematic in everyday practice? Combining findings from an evaluation study and research from early childhood institutions, it is possible to unravel three problem areas. They are described under these headings: (a) Interpreting participation with a bias towards individualism? (b) Play and playful interaction – an integral part of children's right to participation? (c) Are the youngest children ‘mature’ enough? The article is rounded off by pointing to the need to pay critical attention both to what is happening on policy levels, and to theoretical perspectives influencing the professionals in the field. 相似文献
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The purpose of this study was to understand how an 8th grade science class used a structured problem-based learning (PBL) strategy to study volcanoes and to discuss some of the issues that science teachers might encounter when designing and implementing the PBL strategy. This study took place at Collins Middle School, which is located in a cosmopolitan community in Illinois. The PBL lessons, which a teacher taught cooperatively with his student-teacher, required ten class periods to study two real-life volcanic phenomena. The guiding research questions were: (a) in what ways did the teachers (Mr. Brown and Ms. Jones) facilitate student learning about volcanoes using the PBL strategy?; and (b) what were the students’ engagements like during the PBL classes on a volcano unit? This study’s findings supported three main assertions: first, the teachers’ questions and group dynamics guided and facilitated the students’ course of learning; second, with the teachers’ specific guidance, the students collaboratively built up their supporting evidence; most of the supporting evidence was much more developed than just listing the terms or simple facts on volcanoes; and, third, there existed a tension between the teachers’ ideals and the implementation of the PBL strategy. They tended to slip into the traditional role of focusing on scientific facts about volcanoes. 相似文献
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Herein, we present a large-area 3D hemispherical perforated microwell structure for a bead based bioassay. Such a unique microstructure enables us to perform the rapid and stable localization of the beads at the single bead level and the facile manipulation of the bead capture and retrieval with high speed and efficiency. The fabrication process mainly consisted of three steps: the convex micropatterned nickel (Ni) mold production from the concave micropatterned silicon (Si) wafer, hot embossing on the polymer matrix to generate the concave micropattened acrylate sheet, and reactive ion etching to make the bottom holes. The large-area hemispherical perforated micropatterned acrylate sheet was sandwiched between two polydimethylsiloxane (PDMS) microchannel layers. The bead solution was injected and recovered in the top PDMS microchannel, while the bottom PDMS microchannel was connected with control lines to exert the hydrodynamic force in order to alter the flow direction of the bead solution for the bead capture and release operation. The streptavidin-coated microbead capture was achieved with almost 100% yield within 1 min, and all the beads were retrieved in 10 s. Lysozyme or thrombin binding aptamer labelled microbeads were trapped on the proposed bead microarray, and the in situ fluorescence signal of the bead array was monitored after aptamer-target protein interaction. The protein-aptamer conjugated microbeads were recovered, and the aptamer was isolated for matrix assisted laser desorption/ionization time-of-flight mass spectrometry analysis to confirm the identity of the aptamer. 相似文献
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Michelle Bae Greg Dimitriadis 《Discourse: Studies in the Cultural Politics of Education》2015,36(3):314-328
Contemporary discussions of globalisation (in general) and postcolonialism (more specifically) have largely remained wed to critiques of the West, including around its outsized role in the proliferation of neoliberal economic logics. As Chen argues in Asia as Method, these discussions have precluded other kinds of discussions about globalisation and its ‘theories’ – those that are generated between Asian countries and peoples (recognising that ‘Asia’ itself is a construction). In this essay, we look towards a different kind of conversation about the postcolonialism, one that does not take the West as its primary interlocutor. We will look closely at two South Korean contemporary artists – Do Ho Suh (1962–) and Kimsooja (1957–) – and see how they work through contemporary, material concerns around ‘home’ and ‘place’. In particular, these artists point us towards ‘movement’ as a trope for displacing extant concerns with fixed identity and as a kind of ontological state of being in the world. 相似文献
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Satyam V. Rani Bae Younggon Smith John P. Levin Mariana 《Educational Studies in Mathematics》2022,110(3):481-501
Educational Studies in Mathematics - Affect (e.g., beliefs, attitudes, emotions) plays a crucial role in mathematics learning, but reliance on verbal and written responses (from surveys,... 相似文献
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Providing effective motivational support is a critical determinant of a successful online distance learning experience for students in higher education. In this study, we examined how students’ academic level and use of 8 motivational regulation strategies influence 3 types of student engagement: behavioral engagement, emotional engagement, and cognitive engagement. A total of 95 undergraduate and graduate students enrolled in online courses in 4-year universities in the United States participated in this study. A series of hierarchical regression analyses of undergraduate and graduate online students (N = 95) showed that behavioral engagement, emotional engagement, and cognitive engagement are predicted by different motivational regulation strategies after controlling for the academic level. Additionally, students’ academic level was found to be a predictor of cognitive engagement but not a predictor of behavioral engagement or emotional engagement. The results suggest that online course instructors, tutors, and designers should provide students with differentiated motivational scaffolding based on their motivational profile in order to promote different aspects of learning engagement. 相似文献