A Study on A Feedback System and Evaluation of Refresher Distance Education by Satellite

这项研究的目的是评价卫星远程进修教育和开发一个反馈系统。以下是本研究的成果。1.国立科技大学（NTU）国立科技大学的调查（美国）自1985年以来一直通过卫星向工作场所提供学术研究生课程和非学分的继续教育短期课程。2.反馈系统的开发对于卫星远程教育来说，反馈系统是非常重要的，教师可以接受远程学生的提问和意见。我们通过互联网开发了反馈系统。一个学生的界面是WWW浏览器。每个学生都可以通过点击底部向教师发送回复。3.两种不同的传输系统的评估通过同一份问卷，分别评估了两种不同的卫星远程教育传输系统。两种传输系统是模拟视频传输系统和1.5Mbps数字压缩视频传输系统。模拟系统的总体评价明显高于数字系统。采用因子分析法从25个问卷项目中提取出6个因子（形象质量、在场、问答交流、时间安排、内容和音频）。通过多元回归分析，图像质量和存在感对综合评价有显著影响。最后，综合上述结果，得到卫星远程进修教育的信息。

The aim of this research involves evaluation of refresher distance education by satellite and a development of a feedback system. The followings are the achievement of this research.1.Survey of national Technological University (NTU) National Technological University (U.S.A) has been delivering both academic graduate programs leading to Master of Sience degrees and noncredit, continuing education short courses to the workplace by satellite since 1985.2.Development of the Feedback SystemFor distance education by satellite, a feedback system is very important, by which teacher can accept questions and opinions from students of distance site. We developed the feedback system via the Internet. Interface of a student is WWW browser. Every student can send a response to a teacher by clicking a bottom.3.Evaluation of Two Different Delivery SystemsTwo differnt delivery systems for distance education by satellite were evaluated by same questionnaire respectively. Two delivery systems are an analog video transmission systems and a 1.5Mbps digital compressd video transmisson system. The overall evaluation in the analog system was significantly higher than that in the digital system. Factor analysis was conducted to extract 6 factors (image quality, presence, Q&A communication, time schedule, content and audio) from 25 questionnaire items. By multiple regression analysis, the image quality and the presence were significantly effective to overall evaluation.Finally, all the above results are generalized to obtain the information on the refresher distance education by satellite.