“精细农作”实践中,需要在较精细的空间尺度上,获取农田作物生产有关的 空间分布信息,包括利用不同的传感技术采集数据,采用适当的方法对数据进 行处理,转变为易于理解和利用的可视化空间分布图形信息,这主要靠电子信 息硬件与软件技术的支持。需要获取和处理的主要信息包括如下几方面:

一、PLC技术在电气自动化控制中的应用 二、大学生职业资格鉴定对PLC应用技术的要求

◼新技术革命：以信息技术为中心，提高工作效率为目标。◼信息技术三大支柱，即：测量与控制技术、计算机技术、通信技术。◼在这种新技术革命的影响和冲击下，使机电工业发生了极大变化。◼定义：机械技术与微电子技术、信息技术相结合，通称\机电一体化\

光电系统的特点： （1）非接触测量 （2）精度高 （3）信息处理能力强

光纤传感优点： 灵敏度较高；几何形状具有多方面的适应性， 可以制成任意形状的光纤传感器；可以制造传 感各种不同物理信息（声、磁、温度、旋转等） 的器件；可以用于高压、电气噪声、高温、腐 蚀、或其它的恶劣环境；而且具有与光纤遥测 技术的内在相容性

Problems to be concerned with 1. How should we define the concept of Information 2. What are the typical features of Information compared with matter and energy 3. What are the relationship and difference between Shannon Information and comprehensive Information 4. How to reasonably classify Information 5. How to properly represent Information

1 Introduction Background for New methodology Modern natural science methodology is mainly based on matter and energy Even though matter and energy are still necessitate factors in information system, yet the characteristic feature of information systems, particularly the complex ones, is neither matter nor energy but information Without information, the complex information systems, like brain and intelligent life. cannot be understood

1. Information Processing Definition of Information processing All operations exerted to the information itself for its better utilization Information processing is necessary because most of the information in its original form may not be good for use. Thus information processing is the basis of later operations Two categories of information processing: 1)Shallow Level of Information Processing 2)Deeper level of Information Processing

3-1 Measures of Random Syntactic Information Shannon Theory of Information Key point: 1. Information is something that can be used to remove uncertainty. 2. The amount of information can then be measured by the amount of uncertainty it removed. 3. In the cases of communications, only waveform is concerned while meaning and value are ignored. 4. Uncertainty and thus information are statistic in nature and statistical mathematics is enough

1.1 Information science Definition of information Science Information Science is a trans-disciplinary science with information as its object in study; the laws in information process as its content information methodology as its approach; and the strengthening human information functions particularly the intellectual ability, as its goal