The curved floodgate ' s opening measuring system adopts two - level structure , main control level and field level 弧形闸门开度测量系统采用分层分布式两级结构,分为主控级和现地级两层。
Planes is characterized by complex structure and involving in much factors in a air war , this paper establish two - level structure model based on the characteristics of planes , and calculate the weight of each plane ' s qualities by ahp , and present a approach to validate the consistency of weight 针对飞机结构复杂和空战涉及因素较多等特点,建立了两级递阶结构模型,利用层次分析法计算了飞机空-空作战中各品质因素的权值,并给出了进行一致性检验的方法。
With the rapid development of wireless communication technology and computer technology , people wish to get reliable data communication service any time and any where . traditional network can not supply communication service if the whole network need to move because the network devices are fixed by wires and can not move . so , ad hoc network comes . it can provide mobile data communication service compared with traditional network . ad hoc is a network with plat structure and all the nodes is equal . all the nodes need provide relay . but not all the nodes will provide relay and the performance of plat structure is poor in large scale . so the wireless mobile self - organized network adopts a two - level structure by referencing the cell mobile communication system . wmsn uses wireless routers to construct network . it can provide wireless access , relay services to users 考虑到不是所有的站点都愿意提供中继服务及平面结构的局限性(在网络规模较大时性能会很差) ,本课题的无线移动自组织网络参考了蜂窝移动通信系统的特点,是一种具有两级结构的网络。使用专门的无线设备? ? “无线路由器”构成具有用户无线接入、无线组网和路由功能的无线互连网络,为移动用户提供无线接入、路由和中继服务。 ieee802 . 11b可以提供很高的通信速率,可以提供很好的接入性能,并且支持ieee802 . 11b协议的设备正成普及的态势,因此成为我们所选择的链路层协议。
The robot controller adopts a kind of two - level structure . the top level was the host controller and motor driver , the main program and motor servo arithmetic program running in it , and also receive command from the remote computer . the lowest level was two sensing system , fixing on foot of the robot , gathering and processing information from multi - kind sensors , and also controlled the pump and valve 机器人嵌入式控制器采用两层结构,上层为机器人主控及驱动电路,负责运行机器人主控程序及多电机伺服控制算法,以及接收上位计算机的远程遥控命令;下层为两个足部传感系统模块,分别安装在机器人的两个足上,负责多种传感器信息的采集、处理及泵和阀的驱动控制。
Taking liaoning institute of technology as an example of setting up a campus net , the author puts forward two - level structure net design and three - level structure net wiring design . this study expounds the design plan of electing - course system by net based on web with b / s structure , with the students electing - course system as a practical example of the campus net application 并将辽工校园网作为建网的实例,提出了二级结构的网络设计方案和三级结构的网络布线方案,以学生选课系统为校园网的应用实例,论述了基于b / s结构的web方式的网上选课系统的设计方案。