Unit28 Wireless SensorNetwork.doc

Unit 28 Wireless Sensor Networks Key Words and Terms wireless sensor networks 无线传感器网络 exponential adj.指数的，含有幂数的 throughout n.生产量，通过量 infrastructure n.基本设施 overview n. 概观，概述 thermostat n. 自动调温器，恒温器 damper n. 风门，节气阀 intriguing adj. 迷人的，有迷惑力的，引起兴趣的 transparently adv. 明亮地，显然地 symbiotical adj. 共生现象，协作的 joystick n. 操作杆 sporadically adv. 偶发地，零星地 ranch n. 大农场 estrus n. 动情期 irrigation v. 灌溉，修水利 labor-intensive n. 劳动密集 ventilate v. 使通风 transceiver n. 无线电收发机，收发器 mercury n. 汞 microcantilever n. 微机械构件In recent years, the desire for connectivity has caused an exponential growth in wireless communication. Wireless data networks, in particular, have led this trend due to the increasing exchange of data in Internet services such as the World Wide Web, E-mail, and data file transfers. The capabilities needed to deliver such services are characterized by an increasing need for data throughput in the network; applications now under development, such as wireless multimedia distribution in the home, indicate that this trend will continue. Wireless Local Area Networks (WLANs) provide an example of this phenomenon. Other potential wireless network applications exist, however. These applications, which have relaxed throughput requirements and often measured in a few bits per day, include industrial control and monitoring; home automation and consumer electronics; security and military sensing; asset tracking and supply chain management; intelligent agriculture; and health monitoring. Because most of these low-data-rate applications involve sensing of one form or another, networks supporting them have been called wireless sensor networks, or Low-Rate Wireless Personal Area Networks (LR-WPANs), because they require short-range links without a preexisting infrastructure. An overview of application of wireless sensor networks to home automation, consumer electronics, intelligent agriculture and environmental sensing follows. 然而，还存在其他潜在的无线网络应用。这些应用对流量的要求不高且通常只是每天几位的流量，包括工业控制与监测、家庭自动化与消费电子、安全与军