Quantitative Investigation of Internet Infrastructure Suitable for Elementary and Secondary Schools.

在这项研究中，定量地调查了计算机教室中从Web服务器获取信息的响应时间。首先，通过实验发现，学习者对互联网的访问分布可以用伽马分布来近似。其次，搜索对教育有用的网页的数据量。344个网站入选。一个Web页面的平均数据大小约为98K字节，足以下载。第三，设置了一个实验网络来测量响应时间。一台服务器的计算机在几种带宽条件(1.5 Mbps、10 Mbps和100 Mbps)下与8台客户端计算机连接。从客户端到服务器计算机的TCP连接数更改了2、4、8、16、24、32、40和48。这些连接被发射以形成伽马分布。伽马分布的标准差被设置为零(同时连接)、10秒和20秒。从服务器传输到客户端的数据大小已更改。测量的反应时间的中位数显示在等高线上。因此，可以说，1.5 Mbps的互联网连接足以让一间计算机教室使用教育网站。然而，为了使用大文件作为高清晰度图片，需要10 Mbps的互联网连接或ADSL类连接。

In this research, a response time in a computer classroom to get information from Web servers was quantitatively investigated. At first, it was found by experiments that learners' access distribution to the Internet could be approximated by gamma distribution. Second, data sizes of Web pages that are useful for education were searched. The 344 Web sites were selected. The mean data size for an Web page was approximately 98KBytes, which was small enough for download. Third, an experimental network was set to measure a response time. A server's computer was connected with eight client computers under several bandwidth conditions (1.5Mbps,10Mbps, and 100Mbps). The numbers of TCP connections from clients to server computer were changed by 2,4,8,16,24,32,40,and 48. The connections were launched to form gamma distribution. The standard deviation of gamma distribution is set to be zero (simultaneous connections), 10 sec, and 20 sec. The transferred data size from the server to clients was changed. The mediums of measured response time were shown as contour maps. As a result, it can be said that an Internet connection of 1.5Mbps is enough for a computer classroom to use educational Web sites. However, in order to use large files as high-definition pictures, 10Mbps Internet connection, or ADSL class connection, is required.