关于自反空间的一些性质

讨论了赋范线性空间为自反空间的充分条件和必要条件,并讨论了自反与弱紧的关系。     

几类广义压缩映射序列的公共不动点定理

本文主要研究在有界的完备度量空间Ｘ中，自映射序列存在唯一公共不动点的条件。     

Adolescents' Agentic Work on Developing Personal Pedagogies on Social Media

While current research points out that young people are developing emerging culture of learning in informal spaces, less is known about such digital literacy practices in the Asian contexts where the notion of literacy tends to refer to school literacy. Research on young people's online participatory culture continues to suggest that social media offer affinity spaces where extensive knowledge is acquired, constructed and produced outside of schools. In this paper, we use two case studies on social media as illustrative examples to understand how adolescents shape their learning online. We aim to contribute to the ongoing dialectics on social media and learning by examining how adolescents exhibit agency online. We argue that social media such as Facebook offer high learner agency environments for adolescents to participate in self‐initiated enterprise and allow them to develop personal trajectories for learning. The case studies presented in this paper suggested that the adolescents' pursuit of their passions on online affinity spaces gave rise to intellectual friendships and the development of personal pedagogies.     

Effects of active learning classrooms on student learning: a two-year empirical investigation on student perceptions and academic performance

Recent studies on active learning classrooms (ACLs) have demonstrated their positive influence on student learning. However, most of the research evidence is derived from a few subject-specific courses or limited student enrolment. Empirical studies on this topic involving large student populations are rare. The present work involved a large-scale two-year study that examined the effects of ACL on student perceptions of their learning experience and the relationship with academic performance in a General Education programme. An institutional survey was used to gather more than 35,000 units of student perception data from all 306 courses in the programme. Our empirical findings show that students thought courses that adopted an ACL as the key learning environment were significantly better designed and more encouraging of student creativity and innovation than courses which used regular classrooms; thus, student perceptions were improved. We are also the first to report that this positive effect on creativity and innovation is statistically unaffected by academic performance, with high, middle and low achievers all benefiting from the use of the facility. The results suggest that ACLs are better environments for nurturing innovation for all students, regardless of their academic ability.     

Facilitating a culture of relational trust in school-based action research: recognising the role of middle leaders

Abstract

Practices such as formal focused professional dialogue groups, coaching conversations, mentoring conversations and professional learning staff meetings have been taken up in schools and pre-schools as part of long-term action research and development activities to improve the learning and teaching practices. The development of relational trust has long been described in the literature as pivotal for the ongoing ‘success’ of such research and development in sites. In this article, we attempt to re-characterise relational trust as it is accounted for by participants in action research. We present data from a cross-nation study of middle leaders from Australian primary schools and Swedish pre-schools. Middle leaders are those teachers who ‘lead across’; they have both an acknowledged position of leadership or responsibility for the practice development of colleagues and a significant teaching role. The larger study examined the practices of middle leaders; and in this article we draw on interview data from one of the case-study sites that illustrate how colleagues in schools recognise the role middle leaders have for facilitating action research and teaching development. This article specifically presents excerpts from semi-structured interviews with 25 teachers, three principals, three executive teachers and three district consultants. Interviewees described how nourishing a culture of relational trust and mutual respect are critical features in the change endeavour. For them, the practices of the middle leader who facilitated the action research were instrumental in developing trust for teacher development. Analysis of participant accounts revealed five dimensions of trust: interpersonal trust, interactional trust, intersubjective trust, intellectual trust, and pragmatic trust.     

Indexing the bit-code and distance for fast KNN search in high-dimensional spaces

Various index structures have recently been proposed to facilitate high-dimensional KNN queries, among which the techniques of approximate vector presentation and one-dimensional (1D) transformation can break the curse of dimensionality. Based on the two techniques above, a novel high-dimensional index is proposed, called Bit-code and Distance based index (BD). BD is based on a special partitioning strategy which is optimized for high-dimensional data. By the definitions of bit code and transformation function, a high-dimensional vector can be first approximately represented and then transformed into a 1D vector, the key managed by a B -tree. A new KNN search algorithm is also proposed that exploits the bit code and distance to prune the search space more effectively. Results of extensive experiments using both synthetic and real data demonstrated that BD out- performs the existing index structures for KNN search in high-dimensional spaces.     

Creating opportunities for untethered learning

ABSTRACT

This article discusses the use of mobile devices by teachers in two Australian schools. It builds on a theoretical framework which considers the location of mobile learning with respect to time and space. The research used a qualitative methodology in which observations, interviews and document analysis were conducted. The study found that the physical and virtual spaces that were used were different from those used in other lessons. Mobile learning facilitated autonomous learning by students, collaboration with their peers and engagement in topics of interest to them. The study found that students and teachers adopted new roles when using the devices, and were untethered from their conventional learning spaces of the classroom. Learning changed in nature and was aligned with contemporary practices in education.     

Destroy Your Classroom! Re-conceptualizing the Instructor/Student Model in Academic Libraries

ASBTRACT

Pedagogies and technologies evolve, yet academic library learning spaces are unable to keep up with the change. Budgetary and space limitations, traditional teaching practices, and staid attitudes all contribute to tethered spaces hindering active learning. This is a documentation of the authors’ urgent need to break free from tradition while providing students and faculty interactive equipment meeting pedagogical needs in an un-tethered, flexible learning space in three library and non-library spaces at the University of Florida's George A. Smathers Libraries Education and Architecture and Fine Arts Libraries.     

Library Learning Spaces: Investigating Libraries and Investing in Student Feedback

ABSTRACT

We examine how students in academic libraries work; their furniture, technology and space needs; research methods used to determine these; and the results and evolution of our space design and assessment efforts. From the creation of a new collaborative center at Mann Library at Cornell University in 2007 to our latest space redesign in 2015, we've used a variety of qualitative and quantitative methods—including surveys, interviews, usability tests, and participatory design exercises—to discover the study behaviors and needs of users, applied this data to help redesign our collaborative study spaces, and assessed the results.