输电线路网格化智能预警系统中,多模式集成监控技术构建了一个全天候分布式远程鹰眼系统.运用这种全新的监控模式,既可以预警和防止输电线路的外损发生,也可以对正在发生的外损事件组织具有针对性的抢修方案.

运用Canvas对象实现快速抓拍,瞬间获取大容量图像编码,然后通过分段递归续传算法回传给Web服务器,并还原成大容量图片文件.该算法运用在输电线路反外损的航拍巡检视频时,具有分段自适应性和上传还原一次成像的特点.

Because the optimal power flow(OPF) calculation of smart grid is based on the synchronous sampling of electrical signals in the whole power network,a unified time synchronization signal is required to command and control in grid distributed sensing system.A solution of GPS synchronization signal for OPF calculation was presented,which could send the sampling signal embedded with global time-stamp back to the host computer,and provide technical support for OPF calculation.

Because of various uncertain external damages on the transmission lines,a warning system for external damages based on WebGIS technology was built.The system can launch regular scans actively for data interfaces of external damages on the server side,and refresh continuously the status of external damages on the map,which provides an efficient repairing and monitoring platform for external damages management.

With the wide application of Web GIS,browsing and interactive technologies of online maps are becoming mature.Various types of Web GIS callbacks were realized based on the interface and framework mode of Web ADF which rendering an efficient process of map viewing,searching and interacting,and it was also applied to Web GIS of metro traffic simulation tag.

Along with the development of the computerized network technology,global information sharing reaches an unprecedented level,while the problem of information security becomes glaring accordingly.As an integrated set of Internet security solution,public key infrastructure(PKI) has been formed the kernel of information security technology.In addition,it becomes the critical and basic technology of electronic commerce.From the requirements of network information security,based on PKI asymmetric encryption and combining with the technologies of digital signature,identity authentication,digital certificate,the system of identity authentication based on USB Key is created and used in practical applications with excellent result.

A general class named dbEncDecrypt which can encrypt and parse sensitive message in database was constructed on symmetrical DES algorithm.With the help of the class,the sensitive message in the database can be safely,efficiently and easily applied to the relative integrated encryption or decryption on internet.

介绍分层拓扑排序概念以及它与拓扑排序的区别.同时介绍分层拓扑排序算法的设计与实现方法.在算法设计与实现中采用一个链接结构的"优先序列",用它保证有向无回路图顶点的分层拓扑排序.