水尺智能识别技术在潮白河生态补水中的应用

随着科学技术水平的快速发展,人工智能技术已广泛应用在各行业.在2021年潮白河生态补水中,为了能够自动识别向阳闸闸前水位,部署了智能识别摄像机,此类设备采用了基于深度学习算法的水尺智能识别技术,实现水位数据的"所见即所得".通过数据对比与分析,水尺智能识别技术的水位测量精度完全满足水利部SL 61-2015《水文自动测报系统技术规范》相关要求,利用水尺智能识别技术让监测人员可以进行数据对比,减小人为观测造成的误差,同时可以保存连续性水文数据,提高运行管理能力,完全适用于水务业务领域,具有广阔的应用前景.     

2011年12月计算机病毒疫情分析

根据国家计算机病毒应急处理中心对互联网的监测,2011年12月计算机病毒整体感染情况呈平稳态势,主要传播途径仍以＂网络钓鱼＂和＂网页挂马＂为主。     

矿井主通风机不停风倒机控制系统改进方案

针对矿井主通风机不停风倒机控制系统中工控机使用一定年限后容易死机的问题,提出将传感器连接到交换机上,并采用多台工控机同时读取数据的解决方法。针对温度巡检仪及电参数采集模块输出的RS485信号无法直接接入交换机的问题,提出增加串口服务器和增加PLC的RS485模块两种改进方案;分析了两种方案的优缺点,并最终选择增加PLC的RS485模块的方案。实际应用表明,系统改进后运行良好,达到了预期的效果。     

采空区自然发火监测系统的设计

针对现有的采空区自然发火监测方式成本高、易出现故障、维护困难且有线传输方式不可靠的问题,采用无线射频技术和CAN总线技术设计了一种采空区自然发火监测系统,详细介绍了系统的整体架构,主要硬件部分的设计,以及无线通信频率、探头工作时序、无线接收分站工作流程、无线路由控制协议等关键技术的实现等。测试结果表明,该系统组网快速,当两探头间距小于150 m时能够对各监测节点处的温度数据进行实时采集及可靠传输,工作寿命达90 d。     

卧螺离心机变频调速PLC控制系统设计

针对传统的卧螺离心机控制系统存在稳定性差、工作效率低的问题,设计了一种卧螺离心机变频调速PLC控制系统;详细介绍了该系统中共直流母线变频调速系统、副电机随动方案及负载率调整方法、PLC控制系统、组态界面的设计。实际应用表明,该系统运行稳定,提高了离心机的性能。     

一种基于DSP的瓦斯传感器校验仪设计

针对传统的瓦斯传感器校验仪校验点少、准确度不高、体积大的问题,设计了一种基于DSP的瓦斯传感器校验仪,详细介绍了该校验仪的软硬件设计。该校验仪以DSP芯片TMS320LF2407为主控芯片,实现了对8台瓦斯传感器的同时校验,且校验结果准确度高,大大提高了工作效率,节省了工作时间。     

基于Delphi2010高职院校医务所药品管理系统的设计与实现

该系统是实现高职院校药品销售管理系统,该系统以Delphi 2010为开发平台,支持Access数据库,功能有:药品维护、销售管理、库存管理、数据统计/报表、系统初始化、系统维护六大模块。该系统特色有:操作简单,界面整洁,功能强大,人性化设计,故有广泛的应用前景,解决了高职院校医务所中目前存在的药品管理和医疗卫生数据统计难题。     

Topology optimization of free vibrating continuum structures based on the element free Galerkin method

In this paper, the topology optimization design of the free vibrating continuum structures is formulated based on the element free Galerkin (EFG) method. Considering the relative density of nodes as design variable, and the maximization of the fundamental eigenvalue as an objective function, the mathematical formulation of the topology optimization model is developed using the solid isotropic microstructures with penalization (SIMP) interpolation scheme. The topology optimization problem is solved by the optimality criteria method. Finally, the feasibility and efficiency of the proposed method are illustrated with several 2D examples that are widely used in the topology optimization design.     

Min–Median–Max metamodel-based unconstrained nonlinear optimization problems

An important direction of metamodeling research focuses on developing methods which can iteratively improve the accuracy of the metamodel. The intention of these kinds of strategies is to use a space reduction strategy to lead response surface refinement to a smaller design space; and new sample points are commonly generated near the optimum. The potential risk is that some characteristics of given problems might be lost, especially for nonlinear problems. Therefore, a novel metamodel-assisted optimization called “Min–Median–Max” (M3) is proposed. This algorithm classifies sample points into three categories (maximum, median and minimum) based on corresponding objective function values, new sample points should be generated by considering combination of three kinds of samples. In order to avoid local convergence and control size of sample points, particle swarm optimization (PSO) algorithm and radial basis function (RBF) metamodeling technique are integrated to implement the suggested M3 strategy. To validate the performance of the M3 strategy, multiple mathematical test functions are used for evaluating the accuracy and efficiency. As a practical engineering application, drawbead design of a stamping system is optimized. The results demonstrate applicability and effectiveness of the M3 algorithm.     

基于KML的GPS数据轨迹可视化

针对GPS轨迹数据可视化的需求,采用KML技术设计具有针对性的数据管理构件。通过对NMEA-0183数据解析和基于Bursa-Wolf方法的空间数据转换等过程,实现一种空间数据精确转换到KML的方法,成功应用于某GPS数据管理平台,为其提供高效、可靠的GPS轨迹数据可视化与交互处理功能。