DEVELOPMENT OF HOME HEALTH CASE SYSTEM USING WIRELESS INTERNET

我们建立了一个经济紧凑的远程放射学传输系统，即使在灾难中也可以使用。本系统可以通过有线局域网或移动无线局域网传输图像和诊断报告。该系统采用传统的以太网局域网作为有线局域网。另一方面，采用便携式电话线、无线局域网（日本无线电有限公司）和苹果远程访问（苹果有限公司）作为移动无线局域网的传输系统。采用有线局域网、移动无线局域网和ARA移动有线局域网系统的1MB数据包分别需要5秒、13秒和625秒的传输时间。根据我们的测量结果，在一张图片大小为3MB的情况下，有线局域网的速度比移动无线局域网快4倍。究其原因，移动无线电话线路有时存在恶劣的空气传输环境，需要通过纠错功能进行补偿。各种类型的图像相关信息的链式结构工作良好，速度足够快。但对于遇难者身份识别、隐私和安全问题等重要功能，必须通过大地震等灾害环境的模拟来评估。

We built an economical and compact transmission system for teleradiology that could be utilized even in a disaster. Our system can transmit images and diagnostic reports using wired LAN or mobile wireless LAN.The system adopts conventional Ethernet LAN as a wired LAN. On the other hand, transmission systems by the portable telephone line, wireless LAN (Japan Radio CO., Ltd.) and Apple Remote Access (Apple CO., Ltd.) as a mobile wireless LAN are employed.Five seconds, 13 seconds and 625 seconds of transmission time employing wired LAN, mobile wireless LAN and ARA mobile wired LAN system were necessary for 1MB package of data respectively. At 3MB of 1 sheet image size, wired LAN was 4 times faster than that of mobile wireless LAN according to the result of our measurement. The reason is that mobile wireless telephone line has sometime bad air transmission environment and it has to be compensated by error correction function.Chained structure of various type of image related information worked well with enough speed. But important functions such as victims identification, privacy and security problems must be evaluated by simulation of disaster environment such as big earthquake.