The idea of research started with a crazy imaginary theory in the field of astrogeography, saying: We often taught ourselves and then convinced the students that the planet Earth moves despite not feeling the vibratio...The idea of research started with a crazy imaginary theory in the field of astrogeography, saying: We often taught ourselves and then convinced the students that the planet Earth moves despite not feeling the vibrations of traffic, and we listed successive scientific confirmations to indicate the rotation of the planet in a regular movement around its axis once every 24 hours, and it is running in another second movement around the sun once every 365¼ days, so are they only two movements, no more?! Is it possible for him to run at a regular speed in an additional direction?展开更多
针对C/S(Client/Server)架构下的OPC(OLE for Process Control)实时监控系统在互联网应用中的局限,采用ASP.NET和Comet技术,提出了一种B/S(Browser/Server)架构下OPC实时监控系统的设计和实现。该方案只需在客户端安装支持Ajax技术的浏...针对C/S(Client/Server)架构下的OPC(OLE for Process Control)实时监控系统在互联网应用中的局限,采用ASP.NET和Comet技术,提出了一种B/S(Browser/Server)架构下OPC实时监控系统的设计和实现。该方案只需在客户端安装支持Ajax技术的浏览器即可正常工作,通过与采用其他技术实现此系统的方案的对比研究,发现该方案具有较好的易用性、跨平台性。对OPC-DA(OPC-Data Access)连接组件进行了改进和封装,使其更加符合实际应用的需要。模拟实验结果表明,采用Comet技术的方案在保证较好的实时性的同时,服务器的开销也较小,是一种满足Web应用实时性需求的可行方案。展开更多
文摘The idea of research started with a crazy imaginary theory in the field of astrogeography, saying: We often taught ourselves and then convinced the students that the planet Earth moves despite not feeling the vibrations of traffic, and we listed successive scientific confirmations to indicate the rotation of the planet in a regular movement around its axis once every 24 hours, and it is running in another second movement around the sun once every 365¼ days, so are they only two movements, no more?! Is it possible for him to run at a regular speed in an additional direction?
文摘针对C/S(Client/Server)架构下的OPC(OLE for Process Control)实时监控系统在互联网应用中的局限,采用ASP.NET和Comet技术,提出了一种B/S(Browser/Server)架构下OPC实时监控系统的设计和实现。该方案只需在客户端安装支持Ajax技术的浏览器即可正常工作,通过与采用其他技术实现此系统的方案的对比研究,发现该方案具有较好的易用性、跨平台性。对OPC-DA(OPC-Data Access)连接组件进行了改进和封装,使其更加符合实际应用的需要。模拟实验结果表明,采用Comet技术的方案在保证较好的实时性的同时,服务器的开销也较小,是一种满足Web应用实时性需求的可行方案。