PPGIS实现的难点探讨     

张侃 《测绘与空间地理信息》2012,(5):81-83

大众参与地理信息系统(PPGIS)属于GIS技术应用之一,主要强调普通民众的群体参与,以帮助政府、规划等职能部门更好地进行决策和计划。本文着重从技术、公众权利保障性、数据三个方面论述了实现PPGIS项目中主要的难点和核心问题。  相似文献   

Scheme for teleportation of unknown single qubit state via continuous variables entangling channel     

王中结  张侃  范朝阳 《海洋学报(英文版)》2010,29(11)

A new scheme for quantum teleportation of single quantum bit state with using continuous variables entangling channel is presented. In our scheme two entangled light fields are employed. An outstanding characteristic of this scheme is that one atomic state is transmitted directly to another atom without using the third atom as the mediate.  相似文献