基于STM32的航天器电气负载监控系统设计

针对传统电气负载监控系统通信纠错率较低,造成航天器电气负载监控准确率较差的问题,基于STM32设计一种新的航天器电气负载监控系统;分别设计电气负载监控系统的硬件和软件;系统硬件主要设计了嵌入式数据接口以及外接设备、驱动芯片以及监控继电器控制模块,WLAN驱动芯片能够有效降低成本和功耗,提高通信速率;通过电气负载监控执行实现软件功能,建立电力负载管理中心软件,提高监控系统的通信能力,提升负载监控的准确性;实验结果表明,基于STM32的航天器电气负载监控系统通信纠错率平均值为92%,航天器电气负载监控过程误差较小,具有一定的实际应用性。     

基于矢量传感器的无人驾驶车辆信号远程监测系统

传统无人驾驶车辆远程检测系统,由于信号传输距离的影响,在信号波传输过程中在电路耦合率衰减下出现监测信号清晰度降低,信号整体监测效果无法满足实际检测系统应用要求的问题;对此设计系统通过采用矢量传感器对系统变量、模量与定量数据进行矢量统一计算,提出基于矢量传感器的无人驾驶车辆信号远程监测系统;首先完成基于矢量传感器的系统总体框架设计;然后根据设计框架建立无人驾驶车辆监控信号交互硬件单元,通过不同矢量传感器构成监控信号数据矢量转换计算平台;最后通过对硬件平台的矢量化软件适配,完成硬件与软件监控信号统一,提升信号传输强度,增强信号清晰度,从而满足无人驾驶车辆信号远程监测要求,完成系统的设计;通过对比实验数据表明,设计的基于矢量传感器的无人驾驶车辆信号远程监测系统,能够在50～100 km范围内稳定监测车辆状态,车辆状态数据监测实时性与连续性明显优于传统检测系统.     

功率传感器自动校准软件设计与实现

基于C++编程语言和SCPI仪器控制指令,开发通用的功率传感器自动校准控制软件,通过GPIB、USB等数据总线控制各仪器运行,完成对功率传感器的自动校准,并有数据存储和证书记录文件生成功能;软件具有很高的通用性,校准参数自定义设置,支持主流厂商的信号源、功率计和功率传递标准等仪器,校准方法可选择功率传递标准法或交替比较法,对于无数据总线接口的被校功率传感器通过图像识别方式完成读数;软件能够极大提高校准功率传感器的工作效率。     

Research and Practice of Hybrid Teaching for Software Testing based on Interactive Learning

To address the problems of insufficient number of personalized exercises and cases and teachers' lack of grasp of students' weak knowledge points in the current software testing online courses, we study the strategy of establishing and updating intelligent exercise sets and case libraries and analyze the answers and dig out the weak points of knowledge through group intelligence reasoning and interactive machine learning methods. This will help teachers to make uniform and targeted explanations, reduce manual judgment, and achieve intelligent teaching quality reform, and implement the educational concepts of "keeping up with the times" and "teaching according to students' abilities".     

基于对比机制和算法因子的蜂群优化算法

人工蜂群算法是一种简单、高效的智能算法.同时,蜂群算法也存在很多问题,例如:收敛速度不是太快、容易发生局部最优的问题等.一种改进的蜂群算法得以提出,其思想是:引入一种对比机制,和算法因子来改进算法,加强算法全局搜索能力,采用四个基本测试函数对所提出方法进行测试.结果表明,优化后的算法较原算法提高了收敛精度,有效解决了会发生局部最优的问题.     

Sunway supercomputer architecture towards exascale computing: analysis and practice

Science China Information Sciences -     

Preparation of cerium doped Cu/MIL-53(Al) catalyst and its catalytic activity in CO oxidation reaction

Metal-organic framework (MOF) material MIL-53(Al) with high thermal stability was prepared by a solvothermal method, serving as a support material of cerium doped copper catalyst (Ce-Cu)/MIL-53(Al) material for CO oxidation with high catalytic activity. The catalytic performance between the (Cu-Ce)/MIL-53(Al) and the Cu/MIL-53(Al) catalytic material was compared to understand the catalytic behavior of the catalysts. The catalysts were characterized by thermogravimetric-differential scanning calorimetry (TG-DSC), N₂ adsorption- desorption, X-ray diffraction (XRD), and transmission electron microscopy (TEM). The characterization results showed that MIL-53(Al) had good stability and high surface areas, the (Ce-Cu) nanoparticles on the MIL-53(Al) support was uniform. Therefore, the heterogeneous catalytic composite materials (Ce-Cu)/MIL-53(Al) catalyst exhibited much higher activity than that of the Cu/MIL- 53(Al) catalyst in CO oxidation test, with 100% conversion at 80 °C. The results reveal that (Cu-Ce)/MIL- 53(Al) is the suitable candidate for achieving low temperature and higher activity CO oxidation catalyst of MOFs.     

Characteristics of cationic Red X-GRL adsorption by diatomite tailings

As secondary mineral resources, diatomite tailings(DT) got from the Linjiang region of China were prepared and characterized by SEM, XRF and XRD. Mono-factor experiments were carried out to investigate the effects of the operation factor, including contact time, adsorbent concentration, initial p H value of the dye solutions, adsorption temperature and initial concentration of cationic Red X-GRL(X-GRL) on the adsorption of X-GRL. The adsorption kinetics, isotherms, thermodynamics and mechanisms for X-GRL were also studied. It was efficient for DT to adsorb X-GRL from aqueous solutions, and it was even discovered to have higher adsorptivity for X-GRL than diatomite concentrate(DC) in our previous test. The adsorption processes fit very well with the pseudo-second-order model and the Langmuir isotherm equation. In addition, various thermodynamic parameters, such as standard Gibbs free energy(ΔG°), standard enthalpy(ΔH°) and standard entropy(ΔS°) have been calculated. From thermodynamic studies, it was seen that the adsorption was spontaneous and endothermic. The main driving forces of the physical adsorption on DT are electrostatic attraction. The reason why DT showed higher adsorptivity for X-GRL than DC was that there were more clay mineral particles within, which has a remarkable ability of dye adsorption due to its high surface area. DT as a cheap absorbent for X-GRL removal would replace or partially replace the activated carbon.     

Variable sorting based on fault tree structure adjustment for multi-valued decision diagrams

The dynamic fault tree does not have the ability of fault calculation when analyzing the reliability of the system, so it needs to be modeled and analyzed by means of multi-valued decision diagrams and so on. The dynamic fault tree is translated into a multi-valued decision diagram according to the ordering of variables of basic events which affects the size of the generated multi-valued decision diagram and the cost of traversal to get cut sequences. An adjustment method of the dynamic fault tree structure is proposed based on the importance degree of repeated events, dynamic gates and the locations of events of the dynamic fault tree. By taking the fact that the basic events at the same level are equally important into account, an improved dynamic variable ordering method and ordering generation algorithm for the multi-valued decision diagram are presented in this paper. The result analysis of an example shows that the improved dynamic variable ordering method can reduce the size of the multi-valued decision diagram and space and time complexity of the reliability calculation compared to the similar methods.     

Fast method for SAR echo simulation of a three-dimensional ground scene

Due to huge calculation of SAR echo simulation of a three-dimensional (3D) ground scene, a fast simulation method is proposed. First, the data of a 3D ground scene are fractionally interpolated based on the Fractional Brownian Motion (FBM) model. Second, the data interpolated are divided into lots of small facets whose precision meets the simulation requirement, the backscattering coefficients of the small facets are calculated. Third, the shaded area is judged by the comparison method of overlook angles. Three parallel levels are analyzed and the kernel function is designed. Finally, the computing method of reduction adding and external thread are also utilized under the framework of GPU in order to get high efficiency. With the methods mentioned above, the imaging result of experimental DEM data verifies the validity and superiority of the proposed method.