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地理信息系统简称GIS(Geographical Information System)，是六十年代开始迅速发展起来的地理学研究新技术，是多种学科交叉的产物。地理信息系统是以地理空间数据库为基础，采用地理模型分析方法，适时提供多种空间的...

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本文介绍了一种基于公共电话网（PSTN）的电梯安全呼叫系统，采用总线拓扑结构和DTMF 信号对电梯群进行组网，构成由电梯分机、机房电话和小区管理中心的管理主机组成的小区电梯安全呼叫网络，

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Information technology – Abstract Syntax Notation One (ASN.1): Specification of basic notation。ASN.1的标准定义。

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This software documentation contains proprietary information of OpenAccess Software, Inc. it is provided under a licens...

2015-09-03 71 City+Information

The Hardware Book contains misc technical information about computers and other electronic devices. You ll find the pi...

2013-12-13 142 City+Information

Student status management system is development two aspects that typical information management system, IMS( MIS), its d...

2015-11-01 155 City+Information

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