课程知识抉择中的“两难”困境与出路     

潘洪建 《教育理论与实践》2005,(17)

知识价值问题是课程抉择的一个重大问题。长期以来,人们踯躅于科学与人文、实用与教养的二难选择,只有处理好科学知识与人文知识、教养知识与实用知识在课程中的关系,才能对基础教育的课程设计有所帮助。  相似文献   

基于PCA的决策树优化算法     

谢霖铨  徐浩  陈希邦  赵楠 《教育技术导刊》2019,18(9):69-71

为了改善传统ID3算法在分类属性选择上存在多值偏向性的不足,提出基于PCA的决策树优化算法。在普通基于PCA 的决策树改进算法中,存在数据经降维处理后代表性不强的问题,导致算法需经过多次数据运行后,准确率才能小幅提升。在ID3算法基础上,在分类前两次提取属性特征值,并计算了需要分类的数据量,也即对原始数据进行最重要的属性选择。在子树建立之后,再进行数据的降维合并选择。采用UCI数据库中的3个数据集对改进算法进行验证,结果表明改进算法的平均准确率达到94.6%,相比传统ID3算法与普通PCA决策树优化算法分别提升了1.6%和0.6%。因此,基于PCA的决策树算法能在一定程度上提升结果准确率,具备一定的应用价值。  相似文献   

论明代商人对皇木的采办     

李志坚 《信阳师范学院学报(哲学社会科学版)》2006,26(3):118-121

皇木采办是明代社会的重要内容，商人是明代皇木采办的重要力量。商人对皇木的采办开始于正德年间。商办采木出现的主要原因有补救官办采木的弊端，繁荣的市场为商办采木准备了市场条件等。商人从官府领取一定的经费后自行招募人力，进行采办。采木过程包括勘查和砍伐。由于采木地区的恶劣条件以及商办采木本身的弊端使得商办采木没有完全达到预期目的。商办采木实质上是一种加于商人的封建徭役。它给当时的社会和生态环境都带来了危害。  相似文献   

风险认知与决策领域的研究现状分析   总被引：1，自引：0，他引：1  

杨刘敏 《内江师范学院学报》2007,22(3):56-58

风险决策是指决策者在面临两个或两个以上不确定的决策后果,尤其是在面对伴有负面结果的可能性时,所产生的复杂心理过程.对个体风险知觉的探究主要包括风险认知与风险偏好两个方面.风险决策常常涉及多个不确定性的负面结果.因此,个体所知觉到的风险情景也不会是单一的,对动态决策模型的研究成为决策科学发展的一个重要方向.  相似文献   

Consensus among stakeholders about success factors and indicators for quality of online and blended learning in adult education: a Delphi study     

Yves Blieck  Ilse Ooghe  Chang Zhu  Koen Depryck  Katrien Struyven  Bram Pynoo 《Studies in Continuing Education》2019,41(1):36-60

Quality models for online and blended learning (OBL) have mainly been developed in higher education. The literature indicates that these models are often conceptualised from the providers’ perspective. What is important for the quality of OBL from the students’ perspective has recently received increased attention in the literature. Consensus among stakeholders about students’ quality needs is useful to support dialogue between professionals to strategically adopt OBL and to ensure that the needs of students are met. This study aims to validate a quality instrument for OBL, taking a set of 74 quality indicators and analysing them in terms of seven success factors (credibility, accessibility, transparency, flexibility, interactivity, personalisation, productivity). The Delphi method was selected as most suited. Participants from adult education were asked to indicate on a 7-point Likert scale to what extent the indicators add to OBL quality to meet students’ needs. After four Delphi rounds, the participants agreed on definitions of success factors and 30 indicators. The results are useful for institutions, ministries of education and external quality assessment agencies to assess the quality of OBL and can support institutions to implement improvement actions to ensure that the needs of students are met.  相似文献   

成人教育应引入市场营销观念     

李新 《天津职业院校联合学报》2003,5(2):15-16

目前我国的市场经济对人才的需求产生了多样化的特点 ,教育特别是成人教育为了适应市场需求 ,必须进行产业化调整。成人教育作为非义务教育应为发展经济服务 ,把成人教育办成像企业一样 ,按照市场营销规律去运行 ,这是一个值得探讨的问题。  相似文献   

网上信任评价模型及其因素研究     

YU Jian-hong 《教育技术导刊》2007,(17)

缺乏信任被认为是电子商务潜能充分发挥的主要障碍之一。在国外信任实证研究的基础上,提出了网上信任研究的拓扑结构,并分别阐述了这一模型中信任前因、信任表现因子及信任结果的构成要素。  相似文献   

基于实践的网上教学活动方案设计及实施效果反思--以“物流外包的界限”一课为例     

赵敏 《安徽广播电视大学学报》2016,(4):69-72

对如何设计并实施基于实践的网上教学活动进行了研究,以具体一课为例,提出了设计思路、方案内容和实施要点,并对教学效果进行了反思。  相似文献   

Pedagogical practices of NetNZ teachers for supporting online distance learners     

Kwok-Wing Lai 《Distance Education》2017,38(3):321-335

A supportive online learning environment entails teachers using effective pedagogical practices to meet the needs of their students and developing a positive teacher–student relationship to foster learner motivation and engagement. This paper reports a study investigating how 32 secondary teachers in New Zealand taught their online distance classes and how they related to their students. These classes were administered by NetNZ, an online distance education community. An online survey conducted in 2016 found that NetNZ teachers used inquiry-based practices including flipped learning and knowledge-building pedagogies to support agency, autonomy, collaboration, and community development. They also used synchronous and asynchronous communication technologies to overcome barriers of relationship building in online settings. NetNZ was unique in delivering distance education in the New Zealand context in that it used a community approach to encourage a more active participation of its member schools and teachers in delivering distance courses to secondary students.  相似文献   

Deliberative communication goes to college: the ‘Deliberation Forum’ project as a democratic agent of empowerment for communication students     

Vered Malka 《Learning, Media and Technology》2016,41(4):546-565

A new field of research has developed over the last few decades, called ‘Deliberative Communication’. It focuses on the potential contribution of public deliberations to strengthening the foundations of democracy and the promotion of social–political goals and objectives. The current research focuses on a unique case study, the ‘Deliberation Forum’ project, conducted by the Department of Communication at the Yezreel Valley College, Israel. The researcher sought to learn about students' experience of participating in this online forum and the effects they attributed to it, through unstructured interviews she held with them. The students indicated that, for the most part, the experience of participating in the deliberation forum was very positive: it enhanced their self-image as thinking people; strengthened their sense of self-importance as students within the department; developed and reinforced habits of keeping abreast of current affairs as well as critical thinking; and finally, the experience developed and strengthened habits of active participation in pluralistic debates. The study findings indicate that participation in projects of this kind has a clear empowerment potential, while also improving participants' attitude toward public deliberation and decision-making processes.  相似文献