A mode of process/thread communication between QNX and WINDOWS operating systems in isomerous computers is described. It is proved in practice to be an entirely feasible mode with high efficiency and reliability. A so...A mode of process/thread communication between QNX and WINDOWS operating systems in isomerous computers is described. It is proved in practice to be an entirely feasible mode with high efficiency and reliability. A socket created by Socket API is used to communicate between two operating systems.展开更多
In this study,a real-time rotor temperature monitoring system for large turbogenerators using SmartMesh IP wireless network communication technology was designed and tested.The system is capable of providing comprehen...In this study,a real-time rotor temperature monitoring system for large turbogenerators using SmartMesh IP wireless network communication technology was designed and tested.The system is capable of providing comprehensive,accurate,continuous,and reliable real-time temperature monitoring for turbogenerators.Additionally,it has demonstrated satisfactory results in a real-time monitoring test of the rotor temperature of various famous large-scale turbogenerators and giant nuclear power half-speed turbogenerators designed and manufactured in China.The development and application of this wireless temperature measurement system would aid in improving the intelligent operation quality,safety,and stability of China’s large turbine generators and even the entire power system.展开更多
Transmission Control Protocol (TCP) was originally designed for wired networks. Many compatibility problems exist when it is applied to wireless environments, and hence it needs to undergo modifications. Currently, th...Transmission Control Protocol (TCP) was originally designed for wired networks. Many compatibility problems exist when it is applied to wireless environments, and hence it needs to undergo modifications. Currently, there are several TCP performance enhancement techniques for application of TCP in wireless environments, but all of them conflict with IPsec. This paper not only analyzes these conflicts, but also proposes 4 solutions: replacing IPsec with Transport Layer Security/Secure Socket Layer (TLS/SSL) protocol, adopting the extended Encapsulating Security Payload (ESP) protocol, segmenting the TCP route, and modifying the end-to-end protection mode of IPsec. It also presents their strengths and weaknesses.展开更多
提出了一种无线远程温湿度临控系统设计方案。介绍了系统总体架构,重点论述了系统软硬件设计方法。以C8051F单片机为核心,采用数字式微型智能传感器SHT71,实现系统监控终端温湿度采集与控制;通过以太网接入,利用简化的TCP/IP协议,并借...提出了一种无线远程温湿度临控系统设计方案。介绍了系统总体架构,重点论述了系统软硬件设计方法。以C8051F单片机为核心,采用数字式微型智能传感器SHT71,实现系统监控终端温湿度采集与控制;通过以太网接入,利用简化的TCP/IP协议,并借助无线网桥,实现数据远距离传输。该系统无需标定,具有很好的环境适应性。实际应用中,监控终端能够与5 km外的上位机实现可靠的信息交互,对远程控制命令响应时间小于500 m s,保证了被监控设备全天候稳定工作。展开更多
提出了一种基于小型无线嵌入式系统的轻量级TCP/IP协议栈CW_TCP/IP(compact wireless-TCP/IP)。CW-TCP/IP使用适于小型嵌入式系统的简单数据结构调用CCB(connection control block)来处理TCP/IP,它创建TCP/IP头文件时不需参考其它数据结...提出了一种基于小型无线嵌入式系统的轻量级TCP/IP协议栈CW_TCP/IP(compact wireless-TCP/IP)。CW-TCP/IP使用适于小型嵌入式系统的简单数据结构调用CCB(connection control block)来处理TCP/IP,它创建TCP/IP头文件时不需参考其它数据结构,可以采用TCP Veno拥塞控制算法来提高其无线性能。该协议栈具有很高的便携性,因此可开发为处理器和独立的操作系统,目前它可以移植到Linux系统。通过实验对适用于小型嵌入式操作系统的CW-TCP/IP、Linux TCP/IP和C/TCP-IP的性能进行了比较,比较的结果表明了CW-TCP/IP具有卓越的无线性能。展开更多
基金The project supported by the National Meg-science Engineering project of the Chinese Government
文摘A mode of process/thread communication between QNX and WINDOWS operating systems in isomerous computers is described. It is proved in practice to be an entirely feasible mode with high efficiency and reliability. A socket created by Socket API is used to communicate between two operating systems.
基金supported by the National Natura Science Foundation of China (NSFC), No.51607146China National Major Science and Technology Projects 2010ZX06004-013-04-02 and 2012ZX06002-017-02-01+1 种基金Sichuan Science and Technology Program,No.2018GZ0391Sichuan Hydropower Energy and power equipment technology Engineering Research Center, Xihua university, Chengdu 610039, China,No.SDNY2020-001
文摘In this study,a real-time rotor temperature monitoring system for large turbogenerators using SmartMesh IP wireless network communication technology was designed and tested.The system is capable of providing comprehensive,accurate,continuous,and reliable real-time temperature monitoring for turbogenerators.Additionally,it has demonstrated satisfactory results in a real-time monitoring test of the rotor temperature of various famous large-scale turbogenerators and giant nuclear power half-speed turbogenerators designed and manufactured in China.The development and application of this wireless temperature measurement system would aid in improving the intelligent operation quality,safety,and stability of China’s large turbine generators and even the entire power system.
文摘Transmission Control Protocol (TCP) was originally designed for wired networks. Many compatibility problems exist when it is applied to wireless environments, and hence it needs to undergo modifications. Currently, there are several TCP performance enhancement techniques for application of TCP in wireless environments, but all of them conflict with IPsec. This paper not only analyzes these conflicts, but also proposes 4 solutions: replacing IPsec with Transport Layer Security/Secure Socket Layer (TLS/SSL) protocol, adopting the extended Encapsulating Security Payload (ESP) protocol, segmenting the TCP route, and modifying the end-to-end protection mode of IPsec. It also presents their strengths and weaknesses.
文摘提出了一种无线远程温湿度临控系统设计方案。介绍了系统总体架构,重点论述了系统软硬件设计方法。以C8051F单片机为核心,采用数字式微型智能传感器SHT71,实现系统监控终端温湿度采集与控制;通过以太网接入,利用简化的TCP/IP协议,并借助无线网桥,实现数据远距离传输。该系统无需标定,具有很好的环境适应性。实际应用中,监控终端能够与5 km外的上位机实现可靠的信息交互,对远程控制命令响应时间小于500 m s,保证了被监控设备全天候稳定工作。
