电子与通信技术专业英语Unit 3 lesson 17

1、PART1 Awireless sensor network (WSN)consists of spatially distributedautonomoussensorsto monitorphysical or environmental conditions, such as temperature, sound, pressure, etc. ,and to cooperatively pass their data through the network to a main location. The more modern networks are bi-directional,

2、also enablingcontrolof sensor activity. The development of wireless sensor networks was motivated by military applications such as battlefield surveillance; today such networks are used in many industrial and consumer applications, such as industrial process monitoring and control, machine health mo

3、nitoring, and so on. The WSN is built of nodes from a few to several hundreds or even thousands, where each node is connected to one (or sometimes several) sensors (as shown in Fig.17-1). Each such sensor network node has typically several parts: aradio transceiverwith an internalantennaor connectio

4、n to an external antenna, amicrocontroller, an electronicLesson 17Wireless Sensor NetworkTextNew wordNotesExercisesTranslationVocabulary PART1Lesson 17Wireless Sensor Networkcircuit for interfacing with the sensors and an energy source. Asensor nodemight vary in size from that of a shoebox down to t

5、he size of a grain of dust. The cost of sensor nodes is similarly variable, ranging from a few to hundreds of dollars, depending on the complexity of the individual sensor nodes. Size and cost constraints on sensor nodes result in corresponding constraints on resources such as energy, memory, comput

6、ational speed and communications bandwidth. The topology of the WSNs can vary from a simplestar networkto an advancedmulti-hopwireless mesh network (WMN). TextNew wordNotesExercisesTranslationVocabulary Fig.17-1 Wireless Sensor NetworkPART1Lesson 17Wireless Sensor NetworkApplications Area monitoring

7、 Area monitoring is a common application of WSNs. In area monitoring, the WSN is deployed over a region where some phenomenon is to be monitored. A military example is the use of sensors to detect enemy intrusion; a civilian example is thegeo-fencingof gas or oil pipelines. Environmental/Earth monit

8、oring The term Environmental Sensor Networks has evolved to cover many applications of WSNs to earth science research.This includes sensing volcanoes, oceans,glaciers,forests,etc. For example, forest fire detection. A network of Sensor Nodes can be installed in a forest to detect when a fire has sta

9、rted. The nodes can be equipped with sensors to measure temperature, humidity and gases which are produced by fire in the trees or vegetation. TheTextNew wordNotesExercisesTranslationVocabulary PART1Lesson 17Wireless Sensor Networkearly detection is crucial for a successful action of the firefighter

10、s; thanks to Wireless Sensor Networks, the fire brigade will be able to know when a fire is started and how it is spreading. Data logging Wireless sensor networks are also used for the collection of data for monitoring of environmental information. The statistical information can then be used to sho

11、w how systems have been working. The advantage of WSNs over conventional loggers is the live data feed that is possible.Industrial sense and control applicationsIn recent research, a vast number of wireless sensor network communication protocols have been developed. While previous research was prima

12、rily focused on power awareness, more recent research have begun to consider a wider range of aspects, such as wireless linkTextNew wordNotesExercisesTranslationVocabulary PART1Lesson 17Wireless Sensor Networkreliability,real-time capabilities,or quality-of-service. These new aspects are considered

13、as an enabler for future applications in industrial and related wireless sense and control applications, and partially replacing or enhancing conventional wire-based networks by WSN techniques. Smart home monitoring Monitoring the activities performed in a smart home is achieved using wireless senso

14、rs embedded within everyday objects forming a WSN. State changes to objects based on human manipulation is captured by the wireless sensors network enabling activity-support services.TextNew wordNotesExercisesTranslationVocabulary PART2New words and phrases:bi-directional baidirek()n()l adj. 双向的，双向作

15、用的surveillance sveilns n. 监视transceiver trnsi:v n. 收发器constraint knstreint n. 约束，限制deploy dipli vt. 部署intrusion intru:n n. 侵扰evolve ivlv v. 发展；进化volcano vlkeinu n. 火山glacier glsi n. 冰川humidity hjumiditi n. 湿度vegetation veditein n. 植物fire brigade fai brigeid 消防队protocol prutklz n. 协议embed imbed vt. 把

16、嵌入TextNew wordNotesExercisesTranslationVocabulary PART2New words and phrases:Phrases and ExpressionsWSN (wireless sensor network) 无线传感器网络WMN (wireless mesh network) 无线网状网络TextNew wordNotesExercisesTranslationVocabulary PART3Notes:1.A wireless sensor network consists of spatially distributed autonomo

17、us sensors to monitor physical or environmental conditions, such as temperature, sound, pressure, etc.译文：无线传感器网络（WSN）由空间上分布的自主式传感器组成，用以监控物理或环境条件，如温度、声音、压力等。consist of: 由构成，如：All electronic computers consist of five units although they are of different kinds.2.A sensor node might vary in size from th

18、at of a shoebox down to the size of a grain of dust.译文：传感器节点的尺寸从鞋盒大小到一粒灰尘大小不等。that 替代size。英语中，有时为了避免重复提到过的名词，常可用that或those作替代词。其中，that替代单数名词，只能指物；those替代复述名词，既可指物，也可指人。如：（1）The climate of Shenyang is just as bad as that of Beijing. （2）The houses of the rich are generally larger than those of the poo

19、rTextNew wordNotesExercisesTranslationVocabulary PART33.The term Environmental Sensor Networks has evolved to cover many applications of WSNs to earth science research.译文：环境传感器网络这个术语已逐步包含了无线传感器网络在地球科学研究领域中的多种应用。（1）cover: 包含，涉及，如：The talks are expected to cover other topics too. （2）application: 运用，应用

20、，用法为 application（of sth.） (to sth.)，如：The application of new scientific discoveries to industrial production methods usually increases efficiency.4.The advantage of WSNs over conventional loggers is the live data feed that is possible.译文：无线传感器网络的优点是使“活”的数据传送成为可能。Advantage: 有利条件，优势，常与介词over连用，指“与相比的长

21、处”，如：For certain types of work, wood has advantages over plastic.Notes:TextNew wordNotesExercisesTranslationVocabulary PART35.While previous research was primarily focused on power awareness, more recent research have begun to consider a wider range of aspects, such as wireless link reliability, rea

22、l-time capabilities, or quality-of-service.译文：虽然以前的研究主要集中在功能方面，最近的研究已经开始考虑更广泛的方面，比如无线链路的可靠性，实时性，或服务质量。while 在本句中表示对比，转折，如：While some people think his comedy is funny, others find him offensive.Notes:TextNew wordNotesExercisesTranslationVocabulary PART4Exercises:1. Write T (True) or F (False) beside

23、the following statements about the text.a. Sensors are spatially distributed in a WSN to monitor physical or environmental conditions. b. Nowadays, wireless sensor networks are only used in industrial and consumer applications. c. The cost of sensor nodes is very expensive. d. The nodes equipped wit

24、h sensors in a forest can measure humidity in the trees or vegetation. e. The detection by the sensors may help the firefighters put out the fire successfully. f. The WSNs can collect real-time data for monitoring of environmental information. g. People have developed a large number of wireless sens

25、or network communication protocols recently. h. The WSN in a smart home can capture any state changes to objects. 2. Fill in the missing words according to the text.a. The WSN is built of _ which is _ to one or several sensors.b. The cost of sensor nodes depends on _ the complexity _ of the individu

26、al sensor nodes.c. The _ of the WSNs can be a star network or an advanced multi-hop _.TextNew wordNotesExercisesTranslationVocabulary PART4Exercises:d. the WSN is _ over a region where some _ is to be monitored in area monitoring.e. Wireless sensors, which is used to _ the activities performed in _

27、, are _ within everyday objects.3.Translate the following paragraph into Chinese.The WSN is built of nodes from a few to several hundreds or even thousands, where each node is connected to one (or sometimes several) sensors. Each such sensor network node has typically several parts: a radio transcei

28、ver with an internal antenna or connection to an external antenna, a microcontroller, an electronic circuit for interfacing with the sensors and an energy source. A sensor node might vary in size from that of a shoebox down to the size of a grain of dust. The cost of sensor nodes is similarly variab

29、le, ranging from a few to hundreds of dollars, depending on the complexity of the individual sensor nodes. Size and cost constraints on sensor nodes result in corresponding constraints on resources such as energy, memory, computational speed and communications bandwidth. The topology of the WSNs can vary from a simple star network to an advanced multi-hop wireless mesh network.TextNew wordNotesExercisesTranslationVocabulary PART5Translation第17课 无线传感器网络（WSN）无线传感器网络（WSN）由空间上分布的自主式传感器组成，用以监控物理或环境条件，如温度、声音、压力等，并通过网络将数据合成到一个主位置。更现代的网络是双向的，也能够控制传感器的活动。无线传感器网络的发展是出于军事上的应用，如战场监视。今天这样的