摘要
提出了一种以单片机系统负责模拟用梯指令信号的采集,以PC上位机软件对指令信号进行处理结果反馈控制的电梯控制仿真系统框架。在电梯控制仿真系统软件设计的基础上,采用模块化设计的方法,研究了基于单片机的电梯控制仿真系统的控制策略和硬件设计。该系统使用和扩展方便,为各种新型电梯控制技术的进一步研究提供平台。
The Web Information Extraction and Knowledge Presentation System is proposed to extract information from data intensive web pages. It downloads dynamic web pages, based on a knowledge database, changes them to XML documents after preprocessing, finds repeated patterns from them, by using a PAT-array based Pattern Discovery Algorithm, recognizes their data display structure models, automatically based on the repeated patterns and an ontology-based keyword library, and then extracts the data and stores them in the knowledge database with the object-relational mapping technology of XML. Through these steps, web data is extracted automatically, and the knowledge database is also expanded automatically. Experiments on the traffic information auto-extraction and mixed traffic travel schemes auto-creation system showed that the system has high precision and is adaptive to web pages in different domains with different structures.
出处
《计算机系统应用》
2011年第11期114-117,共4页
Computer Systems & Applications
关键词
电梯控制
单片机
仿真系统
elevator control
MCU
simulation system
