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The Resonance Factor: Probing the Impact of Video on Student Retention in Distance Learning. 共振因子:探讨视频对学生远程学习记忆的影响。
Pub Date : 1900-01-01 DOI: 10.28945/1629
N. Geri
Teaching and instructing is one of the challenging manifestations of informing, within which distance learning is considered harder than face-to-face instruction. Student retention is one of the major challenges of distance learning. Current innovative technologies enable widespread use of video lectures that may ease the loneliness of the distance learner and increase retention. This study explores the impact of video lectures on relatively senior students in a distance-learning environment. The study compares the retention and achievements of overseas students enrolled in a financial theory compulsory course, which is considered difficult. Students tend to study this course only after successfully completing other courses. The results indicate that before the introduction of video most of the students who failed the course dropped out immediately after failing, whereas afterwards nearly all the students who failed the course continued their studies. The main findings suggest that video lectures may increase senior students' retention, although their achievements were not found significantly better than those of distance learners that did not have video lectures available. This paper contributes to the informing science transdiscipline by demonstrating the importance of resonance for effective informing.
教学和指导是具有挑战性的通知表现之一,其中远程学习被认为比面对面的教学更难。留住学生是远程教育面临的主要挑战之一。目前的创新技术使视频讲座的广泛使用可以缓解远程学习者的孤独感并提高记忆力。本研究探讨在远距教学环境下,视像讲课对高年级学生的影响。该研究比较了选修金融理论必修课程的留学生的保留情况和成绩,这门课程被认为很难。学生往往是在顺利完成其他课程后才开始学习这门课程。结果表明,在引入视频之前,大多数不及格的学生在不及格后立即退学,而在引入视频之后,几乎所有不及格的学生都继续学习。主要研究结果表明,视频讲座可能会增加高年级学生的记忆,尽管他们的成绩没有发现明显优于没有视频讲座的远程学习者。本文通过论证共振对于有效的信息传递的重要性,为信息科学的跨学科发展做出了贡献。
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引用次数: 27
Aptness between Teaching Roles and Teaching Strategies in ICT-Integrated Science Lessons ict融合科学课教学角色与教学策略的契合
Pub Date : 1900-01-01 DOI: 10.28945/1526
M. Barak, Yael Nissim, D. Ben-Zvi
Teachers' perceptions about their roles may serve to support or oppose the integration of new practices while using Information and Communication Technologies (ICT). To investigate this assertion, we followed the work of six leading teachers in their classrooms during a period of one academic year. By applying the descriptive-interpretive methodology we examined the teachers' role perception and their teaching strategies. The research tools included teachers' interviews, classroom observations, and an aptness matrix that was specially developed for this study. The qualitative analysis focused on four literature-based categories that indicate teachers' roles: guide, motivator, partner, and innovator. In addition, the analysis focused on four constructivist teaching strategies: visualization, problem-solving, inquiry, and reflective learning. Findings indicated that in the ICT lessons, teachers mainly act as guides and motivators while applying two teaching strategies: visualization and problem-solving. Only few teachers felt as innovators and only one teacher applied reflective learning. We demonstrate how the aptness matrix corresponds to the ACOT model for teachers' assimilation of ICT and how it can help teachers identify their own level of ICT implementation while promoting constructivist teaching and learning in their classrooms.
教师对其角色的看法可能有助于支持或反对在使用信息和通信技术(ICT)时整合新的实践。为了调查这一说法,我们在一个学年的时间里跟踪了六位主要教师在课堂上的工作。运用描述性-解释性方法论,对教师的角色感知及其教学策略进行了研究。研究工具包括教师访谈、课堂观察和专为本研究开发的能力矩阵。定性分析侧重于四个基于文献的类别,表明教师的角色:引导者,激励者,合作伙伴和创新者。此外,本文还着重分析了四种建构主义教学策略:可视化、问题解决、探究和反思性学习。研究发现,在ICT课程中,教师主要扮演引导者和激励者的角色,同时运用可视化和问题解决两种教学策略。只有少数教师认为自己是创新者,只有一位教师应用了反思性学习。我们展示了适应矩阵如何与ACOT模型相对应,以促进教师对ICT的同化,以及它如何帮助教师确定自己的ICT实施水平,同时在课堂上促进建构主义教学。
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引用次数: 14
Applications of Semantic Web Technology to Support Learning Content Development 语义网技术在支持学习内容开发中的应用
Pub Date : 1900-01-01 DOI: 10.28945/62
C. Pahl, Edmond Holohan
The Semantic Web is based on ontology technology – a knowledge representation framework – at its core to make meaning explicit and more accessible to automatic processing. We discuss the potential of this technology for the development of content for learning technology systems. We survey seven application types demonstrating different forms of applications of ontologies and the Semantic Web in the development of learning technology systems. Ontology technologies can assist developers, instructors, and learners to organise, personalise, and publish learning content and to discover, generate, and compose learning content. A conceptual content development and deployment architecture allows us to distinguish and locate the different applications and to discuss and assess the potential of the underlying technologies.
语义网以本体技术(一种知识表示框架)为核心,使语义更明确,更易于自动处理。我们讨论了该技术为学习技术系统开发内容的潜力。我们调查了七种应用类型,展示了本体和语义网在学习技术系统开发中的不同形式的应用。本体技术可以帮助开发人员、教师和学习者组织、个性化和发布学习内容,以及发现、生成和编写学习内容。概念性的内容开发和部署体系结构使我们能够区分和定位不同的应用程序,并讨论和评估底层技术的潜力。
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引用次数: 51
Children's Participation Patterns in Online Communities: 儿童在网络社区中的参与模式
Pub Date : 1900-01-01 DOI: 10.28945/77
Oren Zuckerman, I. Blau, A. Monroy-Hernández
Online participation and content contribution are pillars of the Internet revolution and are core activities for younger generations online. This study investigated participation patterns, users' contributions and gratification mechanisms, as well as the gender differences of Israeli learners in the Scratch online community. The findings showed that: (1) Participation patterns reveal two distinct participation types "project creators" and "social participators", suggesting different users' needs. (2) Community members gratified "project creators" and "social participators" for their investment – using several forms of community feedback. Gratification at the user level was given both to "project creators" and "social participators" – community members added them as friends. The majority of the variance associated with community feedback was explained by seven predictors. However, gratification at the project level was different for the two participation types - active "project creators" received less feedback on their projects, while active "social participators" received more. Project feedback positively correlated with social participation investment, but negatively correlated with project creation investment. A possible explanation is that community members primarily left feedback to their friends. (3) No gender differences were found in participation patterns or in project complexity, suggesting that Scratch provides similar opportunities to both genders in programming, learning, and participation.
在线参与和内容贡献是互联网革命的支柱,也是年轻一代在线的核心活动。本研究调查了Scratch在线社区中以色列学习者的参与模式、用户贡献和满足机制,以及性别差异。研究发现:(1)参与模式呈现出“项目创造者”和“社会参与者”两种不同的参与类型,反映了不同的用户需求。(2)社区成员通过多种形式的社区反馈,对“项目创造者”和“社会参与者”的投资表示感谢。在用户层面上,“项目创建者”和“社会参与者”都得到了满足——社区成员将他们加为好友。与社区反馈相关的大部分差异可以用七个预测因子来解释。然而,两种参与类型在项目层面的满足感是不同的——积极的“项目创造者”收到的项目反馈较少,而积极的“社会参与者”收到的反馈更多。项目反馈与社会参与投资正相关,与项目创造投资负相关。一种可能的解释是,社区成员主要是把反馈留给他们的朋友。(3)在参与模式和项目复杂性方面没有发现性别差异,这表明Scratch在编程、学习和参与方面为男女提供了相似的机会。
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引用次数: 17
E-Learning Platform Usage Analysis 电子学习平台使用分析
Pub Date : 1900-01-01 DOI: 10.28945/1511
S. Valsamidis, Sotirios Kontogiannis, I. Kazanidis, A. Karakos
E-learning is technology-based learning, such as computer-based learning, web-based learning, virtual classroom, and digital collaboration. The usage of web applications can be measured with the use of indexes and metrics. However, in e-Learning platforms there are no appropriate indexes and metrics that would facilitate their qualitative and quantitative measurement. The purpose of this paper is to describe the use of data mining techniques, such as clustering, classification, and association, in order to analyze the log file of an eLearning platform and deduce useful conclusions. Two metrics for course usage measurement and one algorithm for course classification are used. A case study based on a previous approach was applied to e-Learning data from a Greek University. The results confirmed the validity of the approach and showed a strong relationship between the course usage and the corresponding students' grades in the exams. From a pedagogical point of view this method contributes to improvements in course content and course usability and the adaptation of courses in accordance with student capabilities. Improvement in course quality gives students the opportunity of asynchronous study of courses with actualized and optimal educational material and, therefore, higher performance in exams. It should be mentioned that even though the scope of the method is on e-Learning platforms and educational content, it can be easily adopted to other web applications such as e-government, ecommerce, e-banking, blogs, etc.
E-learning是基于技术的学习,如基于计算机的学习、基于网络的学习、虚拟教室和数字协作。web应用程序的使用情况可以通过使用索引和指标来衡量。然而,在e-Learning平台中,没有适当的指标和指标来促进其定性和定量测量。本文的目的是描述数据挖掘技术的使用,如聚类、分类和关联,以分析电子学习平台的日志文件并推断出有用的结论。使用了两个度量课程使用情况的度量标准和一个用于课程分类的算法。基于先前方法的案例研究应用于希腊一所大学的电子学习数据。结果证实了该方法的有效性,并表明课程使用与相应学生的考试成绩之间存在很强的关系。从教学的角度来看,这种方法有助于改进课程内容和课程可用性,并根据学生的能力调整课程。课程质量的提高使学生有机会异步学习具有实际和最佳教材的课程,从而提高考试成绩。应该提到的是,尽管该方法的范围是在电子学习平台和教育内容上,但它可以很容易地应用于其他web应用程序,如电子政务、电子商务、电子银行、博客等。
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引用次数: 36
Complexity of Social Interactions in Collaborative Learning: The Case of Online Database Environment 协同学习中社会互动的复杂性:以在线数据库环境为例
Pub Date : 1900-01-01 DOI: 10.28945/1321
R. Rimor, Y. Rosen, Kefaya Naser
This study examines and classifies patterns of interaction in a collaborative database learning environment (Google Docs) by analyzing interactions between 44 graduate students in an Open University course. The patterns of interaction were examined according to a model that tested the degree of collaboration in an online learning environment (Weinberg & Fischer, 2006). The purpose of the study was to examine how the participants reach consensus in the process of database construction. Advanced computer technologies constitute a useful communicative environment for collaborative learning and provide platforms that support interactive learning characterized by collaboration. They facilitate mutual supervision of content studied, development of real-time learning strategies, debate, and cultivation of thinking skills. This gives rise to the following questions: How are the various parameters of interaction expressed in an online database learning environment? What patterns of group interaction develop and how do they do so in this collaborative online environment? The findings of the study present a number of different patterns that develop in this kind of environment and show that the patterns of interaction that emerged did in fact reveal different levels of complexity. It seems that the collaborative environment of the online database contributes to the development of complex patterns of interaction while performing tasks.
本研究通过分析44名研究生在开放大学课程中的互动,对协作数据库学习环境(Google Docs)中的互动模式进行了检验和分类。根据测试在线学习环境中协作程度的模型,对交互模式进行了检查(Weinberg & Fischer, 2006)。本研究的目的是考察参与者在数据库建设过程中如何达成共识。先进的计算机技术为协作学习提供了有用的交流环境,并提供了支持以协作为特征的交互式学习的平台。它们促进了对所学内容的相互监督、实时学习策略的发展、辩论和思维技能的培养。这就产生了以下问题:在在线数据库学习环境中,各种交互参数是如何表达的?在这种协作的在线环境中,群体互动的模式是怎样形成的?这项研究的发现呈现了在这种环境中发展的许多不同的模式,并表明出现的互动模式实际上揭示了不同程度的复杂性。在线数据库的协作环境似乎有助于在执行任务时开发复杂的交互模式。
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引用次数: 39
Decoupling the Information Application from the Information Creation: Video as Learning Objects in Three-Tier Architecture 信息应用与信息创造的解耦:视频作为三层体系结构中的学习对象
Pub Date : 1900-01-01 DOI: 10.28945/414
Xiangming Mu
In this paper a new three-tier video application infrastructure is proposed. Video learning object is introduced as the intermedia tier and it connects the video metadata and video application tier. In addition to the traditional text metadata such as title and description, a wide range of visual metadata including key frames, video storyboards, and fast-forward video are integrated into the video learning object. The visual metadata is organized in hierarchical structure. Video timestamps are used to “mark” different video channels (i.e., visual channel, audio channel, text channel) for the purpose of synchronization. A MPEG-7 compatible XML metadata schema was developed to encode the video learning objects to achieve the reusability and interoperability—different video applications can use the same video learning object without having to reinvent the wheel. A semi-automatic video metadata authorization system called Video Annotation and Summary Tool (VAST) was developed to facilitate the creation of video metadata. The automatic process generates a series of key frame “candidates” (primitive frames) but human beings have to manually select the key frames. The number and the image size of the primitive frames are reconfigureable. The fast-forward version of the original video can also be created from the primitive frames. Finally, we demonstrate how the new three-tier infrastructure is used to guide the development of two independent video application projects: the Open-video digital library project and distance learning using the Interactive Shared Educational Environment (ISEE) project. Both projects utilize the same set of video learning objects.
本文提出了一种新的三层视频应用架构。引入视频学习对象作为中间层,连接视频元数据层和视频应用层。除了传统的文本元数据,如标题和描述,广泛的视觉元数据,包括关键帧,视频故事板和快进视频集成到视频学习对象中。可视化元数据采用层次结构组织。视频时间戳用于“标记”不同的视频通道(即,视觉通道,音频通道,文本通道),以实现同步。开发了兼容MPEG-7的XML元数据模式对视频学习对象进行编码,以实现可重用性和互操作性——不同的视频应用程序可以使用相同的视频学习对象,而不必重新发明。为了方便视频元数据的创建,开发了一种半自动视频元数据授权系统,称为视频标注和汇总工具(video Annotation and Summary Tool, VAST)。自动过程生成一系列关键帧“候选”(原始帧),但需要人工选择关键帧。原始帧的数量和图像大小是可重新配置的。原始视频的快进版本也可以从原始帧创建。最后,我们演示了如何使用新的三层基础设施来指导两个独立视频应用项目的开发:开放视频数字图书馆项目和使用交互式共享教育环境(ISEE)项目的远程学习。这两个项目都使用相同的视频学习对象。
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引用次数: 8
Learning about Ecological Systems by Constructing Qualitative Models with DynaLearn 利用dynallearn构建定性模型学习生态系统
Pub Date : 1900-01-01 DOI: 10.28945/1734
Moshe Leiba, R. Zuzovsky, D. Mioduser, Y. Benayahu, Rafi Nachmias
A qualitative model of a system is an abstraction that captures ordinal knowledge and predicts the set of qualitatively possible behaviours of the system, given a qualitative description of its structure and initial state. This paper examines an innovative approach to science education using an interactive learning environment that supports learners in expressing and simulating conceptual knowledge by building qualitative models in ecology. The learning environment and tools are being developed as part of the Dynalearn qualitative modeling research project, funded by the European Union's 7th framework programme and carried out by a consortium of eight participant universities. In summing up the results, it is clear that from the perspective of systems thinking, the modeling activity affected students' perception of systems making them able to represent it in a more dynamic and comprehensive way.
系统的定性模型是一种抽象,它捕获有序知识并预测系统的定性可能行为集,给出其结构和初始状态的定性描述。本文探讨了一种创新的科学教育方法,使用交互式学习环境,支持学习者通过建立生态学的定性模型来表达和模拟概念知识。学习环境和工具是作为dynallearn定性建模研究项目的一部分开发的,该项目由欧盟第7框架计划资助,由8所参与大学组成的财团实施。综上所述,从系统思维的角度来看,很明显,建模活动影响了学生对系统的感知,使他们能够以更动态、更全面的方式来表示系统。
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引用次数: 4
Student Performance and Perceptions in a Web-Based Competitive Computer Simulation 基于网络的竞争性计算机模拟中的学生表现和感知
Pub Date : 1900-01-01 DOI: 10.28945/65
Nicole A. Buzzetto-More, Bryant C. Mitchell
Computer simulations have implications across disciplines and with learners at all levels. By requiring learners to develop and apply knowledge and skills in interactive changing environments, they encourage deeper levels of learning. Additionally, simulations have been shown to be particularly effective at teaching complicated concepts that depend on the ability to understand interrelationships, strategize, make predictions, analyze and evaluate, and engage in multi-faceted decision making. In order to help students gain a deeper understanding of key business concepts, encourage critical thinking and decision making, foster collaboration and critical discourse, and encourage the application of concepts into real world business practices, the University of Maryland Eastern Shore, a minority serving institution, decided in 2004 to introduce a series of competitive webbased simulations at key junctures throughout the curriculum but focused primarily in the course Strategic Management. The simulation selected covers topics such as Strategy & T actics, Policy, Production, Accounting, Marketing, Finance, Quality control, Human resources, Leadership, and T eamwork and involves students competing in teams against other teams. In order to assess the effectiveness of the simulation, a research protocol was introduced that included the administration of student surveys as well as the collection of performance data. The findings indicate that students overwhelmingly felt that the simulation helped them understand the application of key concepts and learn the decision making process that occurs in professional business practice. The examination of student performance data gathered in this study, with consideration given to the strong levels of student satisfaction, encouraged the authors to postulate based on the high success rates of this student population, which traditionally underperforms in more traditional mode of assessments, that simulations may serve as an equalizer that offers all students, from low to high achievers, an opportunity to succeed and that competitive web-based simulations enhance the overall educational and personal development experiences of minority students enrolled in higher education business programs.
计算机模拟对各个学科和各个层次的学习者都有影响。通过要求学习者在互动变化的环境中发展和应用知识和技能,它们鼓励更深层次的学习。此外,模拟已被证明在教授复杂概念方面特别有效,这些概念依赖于理解相互关系、制定战略、做出预测、分析和评估以及参与多方面决策的能力。为了帮助学生更深入地理解关键的商业概念,鼓励批判性思维和决策,促进合作和批判性话语,并鼓励将概念应用于现实世界的商业实践,马里兰大学东岸分校,一所少数族裔服务机构,2004年决定在整个课程的关键时刻引入一系列竞争性的网络模拟,但主要集中在战略管理课程上。所选的模拟涵盖了战略与技术、政策、生产、会计、市场营销、财务、质量控制、人力资源、领导力和团队合作等主题,并涉及到学生在团队中与其他团队竞争。为了评估模拟的有效性,引入了一种研究方案,其中包括学生调查的管理以及性能数据的收集。研究结果表明,绝大多数学生认为模拟帮助他们理解了关键概念的应用,并学习了专业商业实践中的决策过程。对本研究中收集的学生表现数据的检查,考虑到学生满意度的高水平,鼓励作者假设,基于这一学生群体的高成功率,传统上在更传统的评估模式中表现不佳,模拟可以作为一种均衡器,为所有学生提供,从低到高的成就,一个成功的机会和竞争激烈的网络模拟提高了少数民族学生参加高等教育商业项目的整体教育和个人发展经验。
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引用次数: 20
Comparison of Online Learning Behaviors in School vs. at Home in Terms of Age and Gender Based on Log File Analysis 基于日志文件分析的学校与家庭在线学习行为的年龄和性别比较
Pub Date : 1900-01-01 DOI: 10.28945/1317
G. Ben-Zadok, Moshe Leiba, Rafi Nachmias
Introduction The use of ICT in school allows enhancement of teaching and learning beyond the walls of the classroom. This meets a wide range of school-related needs, such as repeat practice for students, access to materials that are not available in school, and so on (Ally, 2004; Picciano & Seaman, 2007). Therefore, many schools around the world have been introducing online courses or blended learning. But whereas the teacher has significant control over students' online learning process in the classroom, outside the classroom the students confront the assignments alone. They have more responsibility for their learning and are required to demonstrate autonomy and independence in learning. The degree of students' control in online learning is reflected in the way they choose to consume the content: the path, the pace, and the duration of learning, as well as the effort they are willing to invest (Beck, 2007; Sims & Hedberg, 1995). This will yield different patterns of learning. Previous research showed that factors like gender (McSporran & Young, 2001) and age (Cavanaugh, Gillan, Kromey, Hess, & Blomeyer, 2004) are correlated with certain aspects of online learning behaviors. Moreover, several studies showed a need for young students to be scaffolded as part of the distance learning experience; only by the time they are enrolled in higher education may they acquire a degree of autonomy in learning (Cavanaugh, 2005). Many schools, therefore, are concerned about their students' quality of learning and level of readiness for autonomous online learning (Picciano & Seaman, 2007). Hence, there is a need to enhance our understanding of learning behaviors, especially how learners proceed with and without teacher presence, i.e., at school and at home. However, when working with a large population, learners' online behaviors are not easily traced with traditional research methodologies, such as questionnaires and observations (Nachmias & Hershkovitz, 2007). Analysis of the data documented in the log file can help us with this type of mission. While they are learning in online environments, students actually leave a continuous trace of their activity in the form of log file records, which document every action taken with reference to three parameters: what was the action taken, who took it, and when. Extracting these actions from the log files and analyzing them can yield meaningful information and new insights about how students learn in online environments and about their learning styles and needs (Pahl, 2004; Romero & Ventura, 2007). Our aim in this study is to analyze the data derived from students' log files in order to learn more about online learning processes at home and in school, and also to explore if there are certain behavioral differences in both locations in terms of age and gender. Background Online Learning Online learning in K-12 has become more widespread in the past decade. According to a 2008 report by the U.S. Department of Education, t
在学校使用信息通信技术可以提高课堂外的教与学。这满足了广泛的学校相关需求,如学生重复练习,获得学校没有的材料,等等(Ally, 2004;Picciano & Seaman, 2007)。因此,世界各地的许多学校都在引入在线课程或混合学习。但是,尽管教师在课堂上对学生的在线学习过程有很大的控制,但在课堂外,学生独自面对作业。他们对自己的学习负有更多的责任,要求他们在学习中表现出自主和独立。学生对在线学习的控制程度反映在他们选择消费内容的方式上:学习的路径、速度和持续时间,以及他们愿意投入的努力(Beck, 2007;Sims & Hedberg, 1995)。这将产生不同的学习模式。先前的研究表明,性别(McSporran & Young, 2001)和年龄(Cavanaugh, Gillan, Kromey, Hess, & Blomeyer, 2004)等因素与在线学习行为的某些方面相关。此外,几项研究表明,需要将年轻学生作为远程学习经验的一部分;只有当他们被高等教育录取时,他们才能获得一定程度的学习自主权(Cavanaugh, 2005)。因此,许多学校都关心学生的学习质量和自主在线学习的准备水平(Picciano & Seaman, 2007)。因此,有必要加强我们对学习行为的理解,特别是在有老师在场和没有老师在场的情况下,即在学校和家里,学习者是如何进行学习的。然而,当与大量人群一起工作时,学习者的在线行为不容易用传统的研究方法追踪,例如问卷调查和观察(Nachmias & Hershkovitz, 2007)。分析日志文件中记录的数据可以帮助我们完成这类任务。当他们在在线环境中学习时,学生们实际上会以日志文件记录的形式留下他们活动的连续痕迹,日志文件记录了参照三个参数所采取的每个行动:采取了什么行动,谁采取了行动,以及何时采取的行动。从日志文件中提取这些行为并对其进行分析,可以产生有意义的信息和关于学生如何在在线环境中学习以及他们的学习风格和需求的新见解(Pahl, 2004;Romero & Ventura, 2007)。我们本研究的目的是分析学生日志文件中的数据,以便更多地了解家庭和学校的在线学习过程,并探讨两个地点在年龄和性别方面是否存在一定的行为差异。在过去的十年里,K-12的在线学习变得越来越普遍。根据美国教育部2008年的一份报告,在2002-03年和2004-05年之间,参加基于技术的远程教育的K-12公立教育学生的数量增长了65% (Zandberg & Lewis, 2008)。Picciano和Seaman(2007)估计,在2007-2008学年,有超过100万K-12学生参加了在线课程。将信息通信技术整合到学校实践中最有价值的好处之一是,它提高了超越时间和空间传统限制的教与学的可能性(Arbelaiz & Gorospe, 2009;Tubin, Mioduser, Nachimias, & Forkosh-Baruch, 2003)。我们之前的研究(Ben-Zadok, Leiba, Nachmias & Mintz, 2009)表明,以色列的许多学校通过使用在线环境进行家庭作业和自主学习来利用这一优势。关于在线和混合学习的贡献已经做了很多研究。例如,结果指出,这种学习提供了在学校无法获得的内容,它满足了特定学生群体的需求,并且减少了日程冲突(Picciano & Seaman, 2007)。…
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引用次数: 7
期刊
Interdisciplinary Journal of e-Learning and Learning Objects
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