Transforming Biology Assessment with Machine Learning: Automated Scoring of Written Evolutionary Explanations   总被引：4，自引：4，他引：0  

Ross H. Nehm  Minsu Ha  Elijah Mayfield 《Journal of Science Education and Technology》2012,21(1):183-196

This study explored the use of machine learning to automatically evaluate the accuracy of students’ written explanations of evolutionary change. Performance of the Summarization Integrated Development Environment (SIDE) program was compared to human expert scoring using a corpus of 2,260 evolutionary explanations written by 565 undergraduate students in response to two different evolution instruments (the EGALT-F and EGALT-P) that contained prompts that differed in various surface features (such as species and traits). We tested human-SIDE scoring correspondence under a series of different training and testing conditions, using Kappa inter-rater agreement values of greater than 0.80 as a performance benchmark. In addition, we examined the effects of response length on scoring success; that is, whether SIDE scoring models functioned with comparable success on short and long responses. We found that SIDE performance was most effective when scoring models were built and tested at the individual item level and that performance degraded when suites of items or entire instruments were used to build and test scoring models. Overall, SIDE was found to be a powerful and cost-effective tool for assessing student knowledge and performance in a complex science domain.  相似文献   

Media Logic and Political Logic Online and Offline     

Jörg Haßler 《Journalism Practice》2014,8(3):326-341

One aspect of the mediatization of politics is the idea that political actors adapt to the communication logic of news media to gain, for example, news media attention. Currently, this process may be influenced by the diffusion of the internet as a political communication channel, especially because online communication provides a new opportunity for political actors to communicate directly with citizens. Thus far, the adaptation to media logic by political parties has mainly been examined in the context of election campaigns. In order to transfer these findings to regular political communication, this study compares the use of media logic in the mass media and in direct political communication channels online and offline about the United Nations Climate Change Conferences 2011 and 2012. A quantitative content analysis of the conference protocols (input) and the presentation of the conference results in the seven most frequently used German offline news outlets (print and TV) and their online counterparts, as well as political offline and online communication channels like parliamentary speeches and websites of the six parties represented in the German parliament (output), was conducted. Results show that in the context of regular political communication, political actors seem to follow media logic to a lesser extent than in the context of election campaigns. Thus far, the influence of online communication on the mediatization of politics seems to be rather marginal. The causes and consequences of these findings are discussed.  相似文献   

Enhanced TV as brand extension: TV viewers' perception of enhanced TV features and TV commerce on broadcast networks' web sites     

Louisa Ha  Sylvia M. Chan‐Olmsted 《媒体管理杂志》2013,15(4):202-213

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Chinese and non‐Chinese scholars’ contributions to communication research on greater China, 1978–98     

Louisa Ha  Cornelius B. Pratt 《亚洲交流杂志》2013,23(1):95-114

This content‐analytical study investigates, over a two‐decade period, the contribution of ethnic and non‐ethnic scholars to communication research on Greater China. Although its findings show a significant increase in research publications on China over the years by both Chinese and non‐Chinese scholars, Chinese scholars are much more productive than non‐Chinese scholars. In addition, mixed ethnicity scholars have published more comparative studies than single ethnicity scholars. Telecommunications and advertising are the two fastest growing areas in communication research on China.  相似文献   

Learning stories from IT workers – development of professional expertise     

Tak S. Ha 《Studies in Continuing Education》2013,35(1):79-98

In the knowledge economy, many companies are well aware of the vital need to maintain the professional expertise of their workers at a high level. Though there have been a lot of research studies in the areas of professional expertise and workplace learning, few examined the learning pathways novice workers went through to become experts in their professions. Most of the research studies on expertise focused on the nature of expertise and few on its development. As for workplace learning research, most studies focused on the learning resources and methods workers used and the affordances of the workplace in making learning possible. Based on the accounts of expertise development collected from individual information technology (IT) workers in Hong Kong, this paper proposes a four-phase model of professional expertise development in the workplace and discusses its similarities to and differences from extant theories of expertise and skill development.  相似文献   

A U‐Shaped Relation Between Sitting Ability and Upright Face Processing in Infants     

Cara H. Cashon  Oh‐Ryeong Ha  Casey L. Allen  Amelia Cevelle Barna 《Child development》2013,84(3):802-809

A growing body of research indicates connections exist between action, perception, and cognition in infants. In this study, associated changes between sitting ability and upright face processing were tested in 111 infants. Using the visual habituation “switch” task (C. H. Cashon & L. B. Cohen, 2004; L. B. Cohen & C. H. Cashon, 2001), holistic processing of faces was assessed in same‐aged non‐ and near sitters (22–25 weeks) and same‐aged new and expert sitters (27–32 weeks). U‐shaped relation was found between sitting stage and holistic face processing such that only nonsitters and expert sitters processed faces holistically. It is posited that the results are due to a reorganization of the upright face‐processing system resulting from infants' learning to sit independently and trying to incorporate the meaning of upright faces.  相似文献   

Stakeholders’ views of South Korea’s higher education internationalization policy     

Young Ha Cho  John D. Palmer 《Higher Education》2013,65(3):291-308

The study investigated the stakeholders’ perceptions of South Korea’s higher education internationalization policy. Based on the research framework that defines four policy values—propriety, effectiveness, diversity, and engagement, the convergence model was employed with a concurrent mixed method sampling strategy to analyze the stakeholders’ perceptions. According to the findings, the stakeholders perceived that the government’s internationalization policy to date has contributed to the international competitiveness of Korean universities by and large in a quantitative manner. Their views however signaled that the government should consider the quality and identity of Korean higher education institutions when designing and implementing internationalization policy. Based on the implications that the findings have in the policy context, this study suggested two points for future policy research into Korean higher education internationalization: (1) develop a glonacal definition of world-classness for Korean universities and (2) build up a mixture model of centralization and decentralization for the government-university relations, which encourages internal self-governance of Korean universities.  相似文献   

当代越南数学概述     

何辉快 《科学文化评论》2009,6(2):83-92

本文将对当代数学在越南的发展情况做一简短回顾,这里的“当代”是指1947年越南数学家首次在国际期刊上发表数学论文以来直到最近几年。此外,越南1945年9月脱离法国殖民统治宣布独立,所以当代越南数学也就是它在殖民时代以后的历史。  相似文献   

基于资源发现领域的元数据(Metadata)标准   总被引：15，自引：1，他引：14  

贺亚锋 《现代图书情报技术》2000,16(6):60-61

Metadata 作为组织和检索Web 信息资源的数据, 是网络搜寻的关键因素之一, 本文以资源发现领域的元数据标准为研究对象, 探讨了该领域元数据标准的功能、类别和Dublin Core 与MARC 的关系。  相似文献   

Full Steam Ahead: A Conceptual Analysis of User-Supplied Tags on Steam     

Travis W. Windleharth  Jacob Jett  Marc Schmalz  Jin Ha Lee 《Cataloging & classification quarterly》2016,54(7):418-441

This article describes a conceptual analysis of user-generated tags applied to video games in the Steam video game distribution system. The research team scraped all user-generated tags available on Steam and then conducted a conceptual analysis of the tags, sorting them into categories and comparing them to the current version of the Video Game Metadata Schema. This analysis allowed the team to identify new metadata elements and terms useful to game players. We present a discussion covering the major issues in organizing the terms, as well as the implications for the future work in the area of video game metadata.  相似文献