maintaining only frequent itemsets to mine approximate frequent itemsets over online data streams

IEEE

载人潜器半物理虚拟仿真系统及其性能分析

为了缩短深海载人潜器控制系统的开发周期,测试系统性能,根据载人潜器的自身特点,构建和实现了载人潜器所有传感器、执行器设备模拟,以及潜器在海底实景的运动状态的半物理虚拟仿真系统。首先,以仿真系统的硬件架构和数据流程为基础,重点介绍了潜器设备模拟的软件体系结构;其次,在仿真平台上测试了各种网络数据的传输延迟,分析了其整体性能;最后,得出了潜器控制器设计的时间约束。现阶段整个系统已经开发成功,并投入运行到潜器控制系统的安装调试中。

FPGA在偏振耦合测试仪中的应用

在偏振耦合测试仪的PCI接口数据采集系统中,现场可编程门阵列(FieldProgramableGateArray)实现了对模/数器件的控制功能,同时完成了与PCI总线控制器间的数据接口功能。应用自顶向下的设计思想,完成了FPGA内部的逻辑设计,并对其逻辑功能进行了仿真验证,给出了FPGA数据采集时的测试时序图。应用FPGA实现的数据采集系统可以检测出偏振耦合检测仪中的微弱干涉光信号。

多种监控系统基于CAN总线的联网设计

介绍了基于CAN总线的多种监控系统联网设计,该设计应用DDE(动态数据交换)技术实现VB程序与多种组态软件开发的SCADA系统的数据交换,通过调用动态链接库函数完成总线的数据通信,从而搭建了工业现场的信息化管理平台.

A 5GHz low power WLAN transceiver SiGe RFIC for personal communication terminal applications

A low-cost low-power single chip WLAN 802.11a transceiver is designed for personal communication terminal and local multimedia data transmission. It has less than 130mA current dissipation, maximal 67dB gain and can be programmed to be 20dB minimal gain. The receiver system noise figure is 6.4dB in hige-gain mode.

The develop of 622Mbits/s free space laser communication system

622Mbits/s free space laser communication system is developed. IT's communication rate is 622Mbits/s. The whole system include three parts which are signal in and out circuit laser driver and receive circuit and optical antenna The communication principle is introduced The experiment result shows that the transmission of data and image are satisfied with demands of design. It have a definite market value.