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October 21, 2009

最近几天在西西河看关于sensor network / RFID的讨论,在这里整理一下自己的思路。

Sensor network主要是以smart dust (智能灰尘)为主的,带有探测器,处理器和发射单元的微型模块组成mesh network,然后探测信息,传递信息。相关的RFID也是类似的东西,但是以单个的模块为主,最初的卖点是可以在看不到的情况下读取,比如藏在货架深处的物品,目标是取代条码。

但是随着几年的应用,包括沃尔玛这样的巨头也不得不承认,RFID这个东西,一来是成本高,二来是可靠性差(比如在金属货架里面的物品就很难被读取),所以还是有困难。同时RFID也在发展,出现了有源和无源的类型,某些应用发展的也不错,比如老大妈上公交车,就知道年轻女孩扭屁股就可以坐车,这就是无源RFID的典型应用。另外国内某些城际铁路,比如广深线的和谐号,车票就是一张内嵌RFID的纸,对着光可以看到芯片和天线。考虑到车票本身才70人民币,这个RFID的成本已经很低了。

我在讨论的时候说到,其实这个RFID和条码的竞争,是硅和纸的竞争的新方向。以前是计算机和书的竞争,当年的计算机有今天RFID的所有缺点:贵,不可靠,需要电源。但是计算机最后胜出,是因为计算机发挥了自己的优势:单次修改的成本低,,每个copy的成本低,海量存储(或者说,每bit的存储体积低),加上后来的网络,导致传播成本也低,于是造成了今天纸媒被取代的结果。

那么sensor / RFID如果需要和条码竞争,也应该发挥自己的优势,而不是单纯拼成本。比如上期连线杂志就有一个很好的应用:把地中海的活鱼,急冻以后运到纽约的餐馆去。中间鱼是和一个sensor冻在一起的,这个sensor记录了运输过程中鱼的温度变化。这个应用就很好的避开了sensor的缺点:贵,因为鱼的质量和sensor的价格相比,更贵重。而发挥了sensor的优点:海量存储和智能探测。

这就是以己之长,击人之短了。

2 Comments »

  1. you are right,I agree with you.

    Comment by Uggs Boots on Sale — November 11, 2012 @ 10:24 pm

  2. I have to agree, Great blog thanks so much, Were did you get the design from? It looks great

    Comment by Michael Kors Purses — December 24, 2012 @ 1:10 am

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