Instructor Use of Educational Streaming Video Resources

Although a substantial majority of academic libraries now provide streaming video, the literature contains few studies which focus on how such resources are used. This article presents the results of a qualitative research study consisting of in-depth interviews with 18 instructors who use of one category of streaming video resources, educational videos, which are important because they are sold a higher price than most individuals can afford, and thus are typically only available to instructors through the library. The study's main findings are that instructors think educational streaming video resources compare favorably to commercial and non-streaming alternatives in most respects and use them whenever possible, that the primary benefit of these resources is to facilitate better use of limited class time by enabling instructors to assign videos as outside-of-class viewing, and that the library is not the primary means instructors use to discover new educational streaming video resources. Additional insights are provided into factors that academic libraries should consider when deciding which resources to invest in, which acquisition models to pursue, and what marketing strategies to employ to ensure maximum usage.     

Concept Relationships in Knowledge Organization Systems: Elements for Analysis and Common Research Among Fields

Knowledge organization systems have been studied in several fields and for different and complementary aspects. Among the aspects that concentrate common interests, in this article we highlight those related to the terminological and conceptual relationships among the components of any knowledge organization system. This research aims to contribute to the critical analysis of knowledge organization systems, especially ontologies, thesauri, and classification systems, by the comprehension of its similarities and differences when dealing with concepts and their ways of relating to each other as well as to the conceptual design that is adopted.     

Power Struggles,Regulation and Responsibility

This article explores the relationship between the British Board of Film Classification (BBFC) and government during the implementation of the Video Recordings Act (VRA). It considers the public Parliamentary debates about the VRA, and places them alongside private correspondence between the Home Office and the BBFC, and internal BBFC material from the recently catalogued James Ferman papers held at the BFI. As well as exploring the introduction of the VRA, this article also aims to briefly consider its implications for the BBFC, how they set about interpreting and implementing its stringent recommendations and how this impacted upon the organisational working practices of the Board. While the VRA was without doubt one of the most significant pieces of legislation within the history of film regulation in Britain, the time is ripe for its reappraisal and with it a re-evaluation of the role played by the BBFC in securing statutory regulatory powers.     

Granularity of algorithmically constructed publication-level classifications of research publications: Identification of topics

The purpose of this study is to find a theoretically grounded, practically applicable and useful granularity level of an algorithmically constructed publication-level classification of research publications (ACPLC). The level addressed is the level of research topics. The methodology we propose uses synthesis papers and their reference articles to construct a baseline classification. A dataset of about 31 million publications, and their mutual citations relations, is used to obtain several ACPLCs of different granularity. Each ACPLC is compared to the baseline classification and the best performing ACPLC is identified. The results of two case studies show that the topics of the cases are closely associated with different classes of the identified ACPLC, and that these classes tend to treat only one topic. Further, the class size variation is moderate, and only a small proportion of the publications belong to very small classes. For these reasons, we conclude that the proposed methodology is suitable to determine the topic granularity level of an ACPLC and that the ACPLC identified by this methodology is useful for bibliometric analyses.     

视频组播分层解决方案的研究

组播作为一种节约网络带宽、降低网络负载的有效手段,在视频传输中具有广阔的应用前景。本文针对组播中的会话内公平性问题,深入研究了多速率组播分层解决方案的实现机制,并基于目前的研究现状和进展指出了分层组播现存的有关问题。同时为分析分层解决方案在解决组播会话内公平性问题中的有效性,文中通过网络仿真器NS进行了实验评价。     

教育评价改革如何应对AI快速发展的挑战？

继ChatGPT之后,文生视频Sora横空出世。为了应对人工智能快速发展带来的挑战,我国学校教育正在加快推进 AI+教育,但是 AI+教育受唯分数、唯升学、唯学历的教育评价体系的影响,存在知识化、应试化倾向,人工智能在教育领域的应用还主要服务于应试,这既不符合教育改革方向,也难以培养适应人工智能时代的创新人才。应对人工智能快速发展的挑战,关键在推进教育评价改革,要坚定破除唯分数、唯升学的教育评价顽瘴痼疾,要在推进教育评价改革过程中,利用人工智能技术提高评价的效率与公信力。     

苏区社会变迁中的非正式制度分析——基于对宗族改造的反思

当乡村作为革命的嚆矢时,宗族被视为革命的羁绊而成为打击对象。在其后苏区的社会整合中,中共力图通过基层政权建设使宗族走向国家。然而考察苏区整个历史变迁过程,农民的宗族意识并没有完全消除,宗族势力还时隐时现,且在苏区沦陷后很快又得以恢复。通过对宗族改造的考察,我们发现,在社会变迁过程中,产生于自然经济基础之上的文化传统、意识形态等非正式制度具有巨大的弹性,要消弭其对社会发展的消极影响,需要一个长期的、连续的冲击。     

高速无线通信系统中自适应均衡技术研究

首先介绍常见均衡器的结构和自适应算法,然后指出基于RLS自适应算法的判决反馈均衡器可以有较快的收敛速度,同时有较好的均衡效果,并通过Matlab仿真证明。     

SC-FDE、OFDM和SC-TDE三种系统的性能比较研究

正交频分复用(OFDM)和单载波频域均衡(SC-FDE)是针对单载波时域均衡(SC-TDE)的不足而出现的新的调制解调技术,三者既有相似之处,又有差异性。本文从系统原理、净比特率、复杂度、峰平比、信道容量、误码、同步偏差对性能的影响七个方面分析比较了三种系统的性能,从而说明了SC-FDE系统在宽带无线接入中应用的可行性,同时也为更透彻地理解SC-FDE系统原理和更合理地设计系统提供可靠的理论依据。