Due to the lack of current generation in the secondary circuit of zero sequence current transformers in normal operation of substations,it is impossible to effectively detect the integrity of the secondary circuit of zero sequence current during operation. When the secondary circuit of the zero sequence current transformer is open or there is a fault in the circuit shunt,it may lead to protection failure and power grid overstepping accidents. A new live detection device has been developed to detect the integrity of the secondary circuit of a zero sequence current transformer. The device applies a high-frequency excitation signal by binding an iron core coil on one side of the secondary circuit,collects and analyzes the response current of the signal on the other side,diagnoses the open circuit and multi-point grounding faults of the secondary circuit of the zero sequence current transformer,judges the polarity consistency of the transformer,displays and issues a warning in real time,effectively improving the efficiency of distribution network operation and maintenance.
With the rapid development of intelligence,the function of the whole vehicle is becoming more and more complex. More and more cameras,millimeter-wave radars,laser radars,ultrasonic sensors,and various other data acquisition devices are equipped on ve-hicles to support the evolution of autonomous driving capabilities. Compared with the wave of computing chip research and develop-ment,the development of computing chip testing and certification capabilities has seriously lagged behind. In this paper,a set of com-puting power test system is built based on TDA4VM development board. This method measures the actual computing power of the chip under the premise that the AI computing unit of the computing chip is squeezed to the maximum extent. It provides a new method for the calculation force test of the car-level computing chip. It analyzes the influence of the impact factor on the calculation of the model. It forms an independent and controllable test and evaluation ability of the vehicle computing chip,and supports the chip selection of the car manufacturers.
An electronic transformer using IR2155 has the advantages of simple structure, high output power, large current conduction angle and stable work, but it has no regulating function. When the alternating voltage range is from 180 to 250 V, output voltage also changes, so its use is limited. This paper presents the integration of APFC rectifying mode into an electronic transformer. This electronic transformer can work over a wide voltage range from 180 to 250 V; it can stabilize output voltage and has a high power factor, high output voltage, and requires only simple maintenance as well.
Three-dimensional reconstruction refers to the establishment of a mathematical model suitable for computer representation and processing of three-dimensional objects. It is not only the basis of processing, operating and analyzing its nature in the computer environment, but also the key technology of establishing virtual reality to express the objective world in the computer. Therefore, 3D reconstruction is a common scientific problem and core technology in the fields of computer aided geometric design (CAGD), computer graphics (CG), computer animation, computer vision, medical image processing, scientific computing and virtual reality, digital media creation and so on. In recent years, although many algorithms for 3D reconstruction of sequence images have been proposed, the accuracy for 3D reconstruction is still the main problem. In this paper, a new method for 3D reconstruction of sequence images is proposed. Firstly, the Harris feature extraction algorithm is improved to extract more accurate feature points. Then the extracted feature points are tracked in the sequence images. Lastly, the estimated sample consistency algorithm is used for 3D reconstruction after sparse and dense reconstruction. The experiments demonstrate that the accuracy of 3D reconstruction of sequence images is improved.
5G移动通信技术的应用与推广能够给用户提供更高质量的通信服务，节约通信成本，提升数据传输速度，给人们的生活和工作带来更多便利。信息化时代的今天，广播电视已经无法满足人们随时随地观看视频的需求，需要工作人员对广播电视技术进行不断创新，给人们提供更加优质的服务，丰富人们的业余生活。本文主要介绍在广播电视技术领域应用5G技术的必要性以及应用要点，并对其未来的发展趋势进行分析。
Driven by the rapid development of science and technology, people have gradually entered the Internet era, and data shows an explosive growth trend. Information characteristics such as microblog and We Chat are mainly reflected in decentralized storage, large data and exponential growth. In the past,computer frameworks have long been unable to meet the growing demand for data processing and analysis,while data mining technology can extract valuable data from massive data by organically combining multiple interdisciplinary disciplines such as statistics and artificial intelligence, thus providing more significant value. Therefore, how to quickly and efficiently excavate the data with practical value from the massive data has been actively concerned by all sectors of society. Among them, Hadoop platform, as a computer cluster, has highly accurate computing capacity, scheduling capacity, storage capacity, and data processing capacity. Therefore, data mining algorithms based on Hadoop platform can achieve a qualitative leap. Therefore, this paper mainly discusses the data mining algorithm based on Hadoop.
Based on the demand of digitalization of environmental art landscape design, this research puts forward a set of construction scheme of Environmental Art 3D landscape model based on digital virtual technology, reconstructs the rural landscape 3D model by decomposing the spatial characteristics of 3D color features, and makes simulation analysis on the reconstruction effect of the model.
PLC as a core professional course of electrical engineering and automation, this paper introduces specific projects into the teaching, which can improve the teaching quality. Here, the sewage treatment system is used as a specific example and is automatically controlled through PLC, which closely combines the course teaching with practical application and improves the students’ comprehensive ability to solve practical problems.
本文以某变电站为研究对象,分析了 GIS设备局部放电声电联合检测与定位原理,研究了声电联合检测与定位方法,包括检测流程、干扰信号处理、局放源位置分析及故障原因分析等,最后通过对故障设备进行解体验证,发现实际故障点和分析判断的位置误差不超过5厘米,证明了该方法的可靠和准确性,对于发现和诊断GIS内部局部放电缺陷有重要的参考和指导意义.
TR组件广泛应用于雷达、电子对抗、通信领域的有源相控阵系统,具有用量大、价值高、指标参数多、测试流程复杂、测试资源和测试时间耗费大的特点.本文针对产量庞大、集成度高的TR组件创新测试方法,实现了单工位一键全参数全自动测试.目前己搭建样板工位完成技术验证,在效率、成本、自动化程度、人力及场地需求、使用便捷性上都取得了较大突破.
激光雷达以激光扫描为原理,在成功获取对象的三维坐标信息后通过算法重现出来,因此激光雷达会获取相对凌乱且数量庞大的信息,对这些信息的有效处理是其发挥良好观测效用的关键.目前主要通过Delaunay三角剖分算法进行激光雷达扫描所得数据的分析处理,基于该算法模型开展简化算法研究,确定最合适的计算流程,能够在保障准确性的同时实现对三角网格算法的简化,进而推动激光雷达的实际应用效果.
来自移动设备的移动通信量呈指数级增长,突显了未来网络中移动管理比以往任何时候都更高效、更无缝的必要性.由具有传统和毫米波频段的,不同大小蜂窝组成的超密集网络,被视为解决显著的容量紧缩的灵丹妙药.然而,由于存在多个切换,以及由此产生的各种设备的信令开销和数据中断,在一个具有混杂的高频和毫米波频段小区的超密集异构网络中,移动性挑战将是前所未有的.本文概述了一种新的主动移动管理框架,以满足新兴移动网络的需求;强调了制定面向移动的网络规划和优化的必要性;并提供了一些基于人工智能的最新技术,以巧妙地应对与移动相关的挑战.
本文以大型铁路客运枢纽站应急疏散仿真为研究对象,讨论行人在应急疏散情况下的影响因素和交通行为特征,并在MATLAB软件中实现基于模糊推理的行为决策模型的分析.运用AnyLogic软件中的行人库构建行人疏散仿真模型,对重庆市沙坪坝站的候车大厅进行应急场景的设定和疏散方案的仿真实验,根据分析仿真结果,对车站的经营管理者和组织运营提出针对发生安全事故的优化建议.
本文设计了一种用于观瞄系统的指令分发与处理电路板,使用STM32系列单片机作为处理核心,具有5路RS-422接口,可实现电路板与多个模块之间的通讯,通过DS18B20测量观瞄系统的机壳温度,并根据温度预设值控制继电器的开合,从而控制加热装置工作.在软件配置方面,加入了独立看门狗,当电路受到外界干扰而导致程序跑飞时,可重新进入系统,增加了系统的鲁棒性.
智慧医疗背景下,隐私安全问题以及针对可控疾病的安全医疗预测与诊断至关重要.提出一种能够高效率地诊断可控疾病并对个人隐私数据和深度学习模型进行保护的基于边缘计算的安全医疗诊断系统.主要采用CNN卷积神经网络对医学图像数据进行处理,并在联邦学习Flower框架下将模型训练在中间服务器上,数据信息保留在本地客户端,结合差分隐私梯度下降算法保护个人敏感数据,最后使用可追踪的环签名技术在每个客户端签名,以此保护深度学习模型.在Kaggle数据库中已标注处理的原始淋巴切片细胞图片数据集上进行验证,系统准确率达到91.90％.
针对现有打捞设备对河流、湖泊等中小型水域的漂浮垃圾清理效率低、清理不彻底的问题,基于树莓派和单片机设计一种以X型杆机构为收集主体的全新水面垃圾清理装置,详细阐述该装置机械结构设计、执行过程和智能化方案.经solidworks建模分析,搭建实物验证后,结果表明可在多种中小型水域环境下对多种垃圾形态进行收集,收集效果可观.
实验是理论联系实际的重要手段.针对"信号与系统"课程特点及教学中学生难以掌握的教学难点,设计针对我校学生学情的课堂实验,包括MATLAB仿真和电路测量,旨在改善教学效果.学生通过动手测量、仿真,结果与理论分析吻合.教学实践表明,该方案的实施有助于学生加深对相关理论的印象,并提高了学生学习的积极性,明显改善了教学效果.
随着智能电网改革的稳步推进,我国电网和企业已经积极开始利用智能终端技术、PLC技术、云计算技术、尝试开发并投入使用了一系列智能化的电网设施设备,逐渐淘汰了相对落后的电子仪表设备.在这一大环境下,覆盖面积最广的低压配电网络,同样要积极进行智能化配电模式改革.本文也是在此背景下,论述了低压配电网络中电路故障断路保障的智能监控系统,从低压断路器、数据采集器、数据库三个方面,尝试利用PLC技术实现对电路设备设施的智能化保护.
