针对目前大多数大型公共建筑电能浪费比较严重而又缺乏有效监控的情况,结合无线传感网技术,文中设计了一种基于无线传感网的建筑电气设备能耗远程监控系统实现方案,构建了集信息采集、远程传输、分析计算、反馈控制于一体的智能化建筑能效管理系统(Building Energy Management System,BEMS)。该系统主要由无线监控节点、内部网关、服务器和远程用户端四个部分组成,由各个无线监控节点实时监测建筑内电气设备的能耗信息及相关环境参数信息,获取的数据经由相近的内部网关通过无线GPRS协议或有线以太网TCP/IP协议传送到远程服务器;服务器对数据处理后将其存储在数据库中并以不同的方式呈现;远程用户通过移动终端或Web登陆服务器获取建筑内用电设备和环境参数的实时信息,并可实现对用电设备的远程控制。
To extract and express the knowledge hidden in information systems, discernibility matrix and its extensions were introduced and applied successfully in many real life applications. Binary discernibility matrix, as a representative approach, has many interesting superior properties and has been rapidly developed to find intuitive and easy to understand knowledge. However, at present, the binary discernibility matrix is mainly adopted in the complete information system. It is a challenging topic how to achieve the attribute reduction by using binary discernibility matrix in incomplete information system. A form of generalized binary discernibility matrix is further developed for a number of representative extended rough set models that deal with incomplete information systems. Some useful properties and criteria are introduced for judging the attribute core and attribute relative reduction. Thereafter, a new algorithm is formulated which supports attribute core and attribute relative reduction based on the generalized binary discernibility matrix. This algorithm is not only suitable for consistent information systems but also inconsistent information systems. The feasibility of the proposed methods was demonstrated by worked examples and experimental analysis.
