TY -的盟Danaher,布莱恩·G AU - Jazdzewski斯蒂芬•AU -麦凯H Garth AU -哈德森,克林顿R PY - 2005 DA - 2005/9/16 TI -带宽约束在行为改变使用视频和其他富媒体网站乔- J地中海互联网Res SP - e49六世- 7 - 4 KW -健康行为KW -互联网KW -行为研究KW -富媒体KW -视频KW -戒烟KW -带宽使用指数AB -背景:基于网络的行为改变干预通常包括富媒体(例如，视频、音频和大型图形)。使用富媒体的理由包括需要接触到那些不倾向或不能使用基于文本的网站内容的用户，鼓励节目参与，并遵循新闻和体育网站的先例。目标:我们描述了带宽使用指数的发展，旨在提供一种实用的方法来衡量网站在不同的互联网接入场景(如拨号上网和宽带)中可以成功使用的程度。方法:我们进行了三项研究来测量带宽消耗。在研究1中，我们测量了三个视频丰富的网站的带宽使用指数(用于戒烟、护理人员和家庭成员改善老年人护理)。然后，我们估计了在不同的互联网访问场景下，每个网站可以容纳的并发用户数量。在研究2中，我们试图通过测试具有不同并发用户数的视频丰富的戒烟网站来验证我们估计的并发用户数阈值。在研究3中，我们计算了三个版本戒烟网站的带宽使用指数和并发用户阈值:视频丰富版本(在研究1中进行了测试)、音频丰富版本和支持网络的CD-ROM版本，其中所有媒体丰富的内容都放在客户端计算机的CD-ROM上。结果:在研究1中，我们发现视频丰富网站的带宽使用指数在144 Kbps到93 Kbps之间。 These results indicated that dial-up modem users would not achieve a “good user experience” with any of the three rich media websites. Results for Study 2 confirmed that usability was compromised when the estimated threshold number of concurrent users was exceeded. Results for Study 3 indicated that changing a website from video- to audio-rich content reduced the bandwidth requirement by almost 50%, but it remained too large to allow satisfactory use in dial-up modem scenarios. The Web-enabled CD-ROM reduced bandwidth requirements such that even a dial-up modem user could have a good user experience with the rich media content. Conclusions: We conclude that the bandwidth usage index represents a practical tool that can help developers and researchers to measure the bandwidth requirements of their websites as well as to evaluate the feasibility of certain website designs in terms of specific use cases. These findings are discussed in terms of reaching different groups of users as well accommodating the intended number of concurrent users. We also discuss the promising option of using Web-enabled CD-ROMs to deliver rich media content to users with dial-up Internet access. We introduce a number of researchable themes for improving our ability to develop Web-based behavior change interventions that can better deliver what they promise. SN - 1438-8871 UR - //www.mybigtv.com/2005/4/e49/ UR - https://doi.org/10.2196/jmir.7.4.e49 UR - http://www.ncbi.nlm.nih.gov/pubmed/16236701 DO - 10.2196/jmir.7.4.e49 ID - info:doi/10.2196/jmir.7.4.e49 ER -