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

本研究的目的是对卫星远程进修教育进行评估，并开发一个反馈系统。本研究的主要成果如下：1.美国国立理工大学的调查自1985年起，美国国立理工大学开始通过卫星向工作场所提供硕士学位的学术研究生课程和无学分的继续教育短期课程。2.开发卫星远程教育反馈系统，一个反馈系统是非常重要的，通过它教师可以接受远程站点学生的问题和意见。我们通过互联网开发了反馈系统。学生的界面是WWW浏览器。3.评价两种不同的卫星远程教育交付系统，分别对两种不同的卫星远程教育交付系统进行了评估。两个传输系统分别是模拟视频传输系统和1.5 Mbps数字压缩视频传输系统。模拟系统的总体评价显著高于数字系统。通过因子分析，从25个问卷项目中提取了6个因素(图像质量、在线状态、问答交流、时间安排、内容和音频)。通过多元回归分析，图像质量和临场感对综合评价有显著影响，最后对以上结果进行综合，得到卫星远程进修教育的相关信息。

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.