信息时代下,通过在线收看视频课程的网课教学模式的兴起,实现了教学方式现代化发展,对传统的教学模式有一定的冲击作用.本文阐述了疫情下高校网课教学实施情况,进一步提出大学生网课学习存在的问题,最后针对网课教学存在的问题提出了整改措施. 传统的课堂教育是以"教师、学生、课本"为中心、以课堂教学为载体的一种教育模式.这种教育模式存在一定的局限性,虽然经过了很多次改革、完善,目前仍然是被广泛接受的教育方式.信息时代的来临,在线网课的兴起对于教育模式的变革,既是机遇也是挑战.随着网络教育的兴起,精品课、慕课(MOOC)、资源共享课等融合"互联网技术"的教育模式的网课逐渐进入到了传统课堂.这些新兴的教学模式打破了传统课堂对时间和场所的限制,使教育在自主性和开放性上变得更加灵活而有趣味.而教学内容,教学方式,教学手段呈现了多元化趋势,并且优质教学资源得到了广泛的传播和充分利用,从而降低了教育成本.

电路原理课程是电气大类专业的重要基础课,“电路原理”课程具有内容多、理论性强、计算繁杂、习题量大的特点.本文主要从教学理念、教学内容、教学手段、教学实验等方面进行了改革与实践,取得了良好的效果.

随着现代电子技术、计算机技术和网络技术的发展，“数字电子技术”课程教学内容日趋分化，分析方法更多样，授课内容更复杂。目前课程教学正处在优化、调整、整合的时期，本文结合本校实际情况，对本科“数字电子技术”课程的教学改革进行探索，并在教学中重视“基础知识、基本方法、基本思想”，注重理论与实践环节的有机结合，注重现代教学媒体与传统媒体的有机结合，充分调动学生学习的主动性和创造性。

考试是教学的重要环节。是培养学生工程实践能力和创新能力的重要栽体。考试改革的目的就是通过改革考试的内容和形式及评价方式，引导学生在掌握基本理论、基本知识和基本技能的基础上，充分发展创新意识和创新能力。

Aimed at the condition that laboratory instrument resource can not meet the demands of experimental teaching,management and upgrading because of shortage,decentralization,obsolescence and aging,therefore a design proposal of network experiment system based on LabVIEW is presented.The data transmission of tree modules is achieved with application of DataSocket technology and Remote Panels technology,which are virtual instruments,simulation and real time measure.Practical application shows that this system can reduce attrition rate of machines and improve the utilization efficiency of instruments and it has some other advantages including short development period,low cost,good compatibility,good extensibility and easy update for equipments.The network construction based on virtual instrument technology has broad prospects in industry and scientific experiment.

In view of the digital signal processing's problems in learning and teaching,a set of virtual demonstration experiment system for digital signal processing teaching is designed based on LabVIEW programming environment,and two virtual demonstration experiments which are Nyquist sampling theorem and the relation between circular convolution and linear convolution are introduced.Teachers could dynamically demonstrate that the variable signal parameters have an effect on experiment phenomenon in these teaching programs.Practical application shows that the application of LabVIEW in the digital signal processing teaching has greatly diversified the teaching methods and means,improved the quality of instruction and strengthened the interest and initiative of students' study.The virtual instrument design is used in the course of theoretic teaching to develop a new teaching platform,which has great positive role to improve the diathesis of students.

电路原理课程是电类专业的重要技术基础课,该课程理论性强,分析方法多,概念多,学好该门课还需要学生具备一定的数学、物理基础知识。因此学生学起来普遍反映难度比较大。为了提高教学质量,改善教学效果,本课题组老师从教学内容、教学手段、教学方法、考核体系、实践环节等几个方面入手进行了改革与实践,取得了很好的效果。

To avoid shift-variance defects in the original Non-aliasing Contourlet Transform (NACT), a new approximate Shift-invariance NACT(SINACT) was proposed. On this basis, a mixed statistical model image denoising method was presented based on SINACT. This method took full advantage of the characteristics that there were intra-scale and inter-scale correlations for signal coefficients and there was no intra-scale correlation but strong inter-scale correlation for noise coefficients at small scales. Furthermore, a mixed statistical model was used to estimate the small-scale signal coefficients to avoid noise coefficients amplified by the non-Gaussian bivariate model. Experimental results show that the proposed scheme can overcome the aliasing in the Contourlet transform domain and can avoid ″scratching″ and edge blur phenomena in the reconstructed image. The denoising Peak Signal to Noise Ratio(PSNR) of the proposed scheme is on average higher by about 2.87, 1.32 and 1.36 dB than those of the Contourlet transform hard-threshold denoising, Contourlet transform domain HMT denoising and hard-threshold denoising based on NACT, respectively, and it can achieve an excellent balance between suppressing noise and preserving as many image details and edges as possible.

本文总结了笔者多年从事"电工电子技术"课程教学的经验和体会。从理论教学与实践教学出发,提出了该课程从教学内容、教学方法和教学手段等多方面进行改革的具体措施。

In order to solve the high resolution problem for long measuring range precision measuring,the measure method based on vernier principle was studied.The method was that testing analog signal was divided fiducially main signal with long measuring range and precise assistant signal with short measuring range.They were measured respectively then assembled.A long measuring range precision measure system was made up of general resolution A/D converter,single-chip,amplifier etc.The method was used in measuring resistance with temperature curve.It is fit for precision measuring the tiny variety.The measure effect is satisfactory even if the small signal input.The analysis and application indicate that the measure device is sensitive and steady,the difference of testing signal and the fiducial signal is smaller,precision is the higher.The measure method based on vernier principle can meliorate measure device's incertitude performance.It can use measure tool with general precision to actualize long measuring range precision measure.

树立科学发展观,坚持"以人为本"和构建社会主义和谐社会是我国当前新的战略指导思想。构建和谐校园是构建和谐社会的重要组成部分。和谐的校园离不开和谐的课堂。坚持科学的教育发展观,必须狠抓课堂教学改革,使课堂教学尽可能地发挥其作用,让尽可能多的学生得到终身受益、终生发展的教育作用。本文就如何以学生为主体构建和谐课堂的方法和思路进行了探讨。

In this paper,the various energy-saving strategies of the sensor nodes are analyzed from two aspects:low-power hardware design and low-power energy management of the sensor node.By reducing the energy consumption of a single wireless sensor node,the life of Wireless Sensor Network(WSN) can be prolonged.

Wavelet neural network(WNN)combines the time-frequency location and multiple-scale analysis of wavelet transform and the self-organization and learning ability of the neural network,which is very suitable for fault diagnosis.In this paper,the fault diagnosis method for analog circuit based on WNN is introduced.Wavelet Transform is used to decompose fault signal in levels and acquire signal component in various frequency segment,using the ingredient that could reflect the fault signal character as circuits fault character to input ANN to neural network.With this method,the input number is reduced,the structure is simplified and the training time is reduced.Therefore,the ability to identify fault sort is enhanced.

本文阐述了学习电路理论的意义,探讨了对偶原理和对偶元素在电路分析中的地位,阐明了电路课程教学中及早建立对偶概念的必要性,最后总结了对偶原理在电路教学实践中的运用方法。

从当今社会发展对高素质创新型人才的需求和培养出发,结合历届全国大学生电子设计竞赛的命题趋势和特点,论述了如何通过单片机实验教学改革,提高学生应用理论知识解决工程实际问题的创新能力的方法。

任务驱动法是一种建立在建构主义学习理论基础上的教学方法，它将传授知识为主的传统教学，转变为以解决问题、完成任务为主的多维互动式教学。本文以“电子技术”课程的理论教学为主要研究内容，提出了实践教学驱动理论教学的任务驱动教学模式，探讨了任务驱动教学方法在“电子技术”课程教学实践中的应用。实践证明任务驱动教学方法在改进教学质量、提高学生学习电子技术课程的兴趣、培养学生创新能力等方面具有良好的效果。

Based on the negative pressure wave,the correlation analytic method is used for leakage detection and location of pipeline,the algorithm of the leakage location is also introduced in the paper.The leakage location of pipeline is carried out accurately and credibly.

In order to solve the problem of the data gathering and transmission of CCD image,a kind of high-speed acquisition system based on USB2.0 and linear CCD is designed.The system adopts CPLD(complicated programmable logic device)to realize the systematic timing and logic control.The CCD signal processor chip of XRD4460 is used to realize high-speed A/D switching.In order to guarantee the high-speed transmission of CCD image data,FIFO(First in First Out) is used as the buffer memory to store the data between the CCD data flow and the 8051 computer.The control signal and the high-speed data transmission between the acquisition system and computer were carried out by the GPI interface mode using CY7C68013.

分析国内摩托车发动机测量压缩比技术的现状及缺陷,提出了改进的压缩比测量方法--液体测量.文章详细论述了液体测量方法的原理、关键问题以及液体的选择,同时研制了一套压缩比测量系统,该装置操作简单,安装方便,目前已应用于生产实践中,使用情况良好.

介绍PLC控制系统软硬件设计、系统安装时的抗干扰措施和方法。