利用线上教学资源组织教学已成为新的教学形态.华中科技大学电信学院 2020 年、2021 年"微机原理"课程分别采用了翻转式教学、线上线下混合式教学.对比分析两次教学过程中产生的线上教学资源利用数据以及教学效果,发现线上线下混合式教学模式更有利于提升教学效果,学生线上资源学习行为数据,如学习频次、单次学习量、学习时段以及完成度可以作为过程性学习效果评价考核依据.

汇编指令是微机原理课程重要的教学内容.为方便学生利用课余时间通过线上线下结合的方式学习汇编指令,设计了一个MIPS汇编指令线上实验教学系统.该系统既支持汇编指令程序设计实验,也支持汇编指令执行流程演示和考核实验.学生实验过程无须教师参与,系统自动检验学生实验结果,并将实验结果及时反馈给学生.系统实时记录学生实验行为、出错信息以及实验结果,这些信息给教师提供了学生线上学情分析的相关依据.该系统应用于实验教学中,取得了良好的效果.

由于新冠疫情的大规模爆发,线上教学成为全球各大高校教学的新形态.工程实践类课程教学除了传授理论知识,还需进行大量的实践活动,学生才能较好地掌握所学知识.全程线上教学为这类课程的教学实施带来了挑战.结果表明相关线上教学举措能够适应工程实践类课程的教学需求.

针对"计算机组成原理与接口技术"课程实验教学中Verilog HDL微处理器实验,设计了一个信息化在线仿真平台,该平台支持个性化实验任务布置、设计代码提交、设计自动化仿真验证及评分、仿真结果图形化呈现、学生实验行为数据收集等功能.此平台更加科学和公平的方法实现了仿真验收以及实验评分,为教师定位教学难点、改进教学方法、提高教学质量提供了参考依据.

Microcomputer system is unsuitable as a practice platform for "Computer Organization and Interface Technology" learners because of its complexity. In order to solve this problem, the educators have proposed a large number of solutions, such as simulation software, embedded micro-controller, FPGA, etc., but all the existing solutions have certain limitations. This paper presents a practical approach combining simulation software and FPGA platform, which can effectively help students understand the knowledge required for the course. The approach has been in use for undergraduates of the school of electronic information and communications in Huazhong University of Science and Technology for many years, and the outcome is good.

"新工科"建设要求高校适应和引领新经济.数字电子技术正由固定功能器件向超大规模全可编程器件发展.为适应数字电子技术发展趋势,我校电信学院提出将"数字电子技术"、"微机原理"以及"嵌入式系统"等课程从教学内容、实践手段、组织形式、师资队伍等方面实行贯穿式教学改革.该改革举措能有效帮助学生掌握现代数字电子系统设计技术和工具,为学生快速适应业界需求奠定良好基础.

本文以提高学生硬件设计水平及培养创新能力为目标,以FPGA内部嵌入式软核处理器为基础,探索接口技术实验教学内容的设计并简要介绍了实验流程.本文为微机接口技术的实践教学提供了一种新的思路.

德国高等工程教育毕业生高就业率及德国先进的工业生产水平与其高等工程教育培养方案紧密相关.德累斯顿工业大学高等工程教育培养方案的培养目标、制定策略及实施方案,在工业界参与、专业课教学、工程实践等方面有值得借鉴的经验.

本文根据数字系统设计方法和实现技术的发展现状,提出将数字电路和微机原理类课程统一到数字系统这一框架内,硬件描述语言和可编程逻辑器件应该作为数字电路课程的基本教学内容之一.我们以“C语言→MIPS汇编→MIPS处理器设计→接口技术”为主线组织微机原理课程的教学内容,同时还构建了基于FPGA的数字系统实验平台,使之能与后续的嵌入式系统课程结合.通过三年实践,取得了良好的效果.

The analysis of undergraduate programs and curriculum in electrical engineering( EE) of eight famous U. S. universities reveals the characteristics of their talents training. The EE specialty caliber is broad at U. S. universities. The U. S. universities put emphasis on general education. The EE curriculum reflects the wide caliber,heavy base and emphasis on digital systems and computer knowledge. The unique course of introduction to EE lays a good foundation for the engineering education and the ability training of the students. Some of their experiences is worthy of reference and learning by us.

本文针对微处理器发展的多样化给教学带来的困扰,就如何选择合适的教学内容、教学平台、教学方式让学生在有限的教学学时内掌握微处理器相关的计算机原理以及接口设计技术,开设了“微处理器与接口技术”课程.我们将这门课程替换原有“微机原理与接口技术”课程,并在我系数理提高班进行了有益的教学实践,取得了较好的教学效果.

Principle of Microcomputer and Interface Technology is the university fundament platform course for electrical and electronic information or other similar majors. How to efficiently organize the contents of the course to make the students fit the computer application system design requirement nowadays is the problem that the course educational reform is facing with. The paper researches and analyzes the teaching contents of Principle of Microeomputer and Interface Technology related courses in both domestic and foreign universities, based on the course position in the related diseipline, it proposes a few suggestions for the tours teaching reform.

This paper focuses on the problems in teaching process of the electronics technology class foundation courses, which are required for EE and CS undergraduate students. And under the collaborative innovation con-cept, the paper has provided some collaboration methods and measures through knowledge, theory and practice, school-enterprise, curricular and extracurricular, course and competition, studying process, and class teaching and learning in web, in order to explore new ways of teaching reform.

In view of the characteristics of Wireless Mesh Network (WMN), this paper investigates the relationship between the ideal optimal density of replicas over the space and the popularity spatial distribution of the media segments together with the capacity and reliability of the nodes, and then proposes a reliability repairing based replication optimization algorithm. Accordingly, to timely and accurately understand the characteristics of the nodes at various locations, this paper proposes a reliability estimation algorithm base on analyzing the age distribution of media segments and nodes. Further on, an implementation of full-distributed lightweight replication strategy is presented. These estimation algorithms and caching strategies only employ the handy information without adding complex infrastructure or suffering too much overhead, not only maintain the WMN scalability and flexibility, but also take into account the computing power and resource constraints.

With the applications increment of video conference based on wideband IP network, in order to solve the problems such as the servers' burden and QoS for scaled video conference, the paper proposes a video conference architecture based on P2P technology. The architecture adopts a hybrid mechanism, which is based on P2P technology and Proxy, to transfer the video for users; it uses layered authorization mechanism to authorize the user to admit the video conference, and uses encryption technology to encrypt the video content that are transferred in P2P mode. The system can support scaled video conference, and it can also make sure of the confidentiality of the admitted users in the video conference, and provide the security of the video content.

由于网络的时变性和异构性,以及在拥塞情况下的高丢包率,利用TCP传输流媒体数据是Internet流媒体分发系统提高流媒体分发质量的首选方案.由于TCP具有超时或错误重传机制,在网络拥塞情况下,难以保证高码率流媒体数据传输的实时性,因此提出一种面向TCP流媒体传输的编码码率自适应算法(TCP_RA).该算法根据流媒体发送应用层缓冲区读写指针差值调整流媒体发送端的编码码率适应网络带宽的变化.仿真实验对比分析了该算法与基于UDP之上TFRC协议的流媒体传输码率自适应算法在流媒体传输质量上的差别.结果表明,该算法在网络环境较差的情况下有效地提高了流媒体传输质量.并且该算法容易实现,值得推广.

P2P technology is widely used to accelerate the file transfer, but nowadays P2P file delivery systems seldom control the file access right, so not suit the business applications' requirement. According to the features of BT file delivery system, the paper proposes a strategy on file access right control for BT P2P file delivery. The strategy only permits authorized users downloading the encrypted torrent file and decrypting the encrypted torrent file, in order to avoid unauthorized users entering the P2P overlay network to access the access limited shared file, so that the shared files' access right control is implemented in BT system.

Wireless interference makes simultaneous use of some adjacent links impossible,it is impractical to adopt the P2P streaming delivery scheme used in conventional wired networks to wireless mesh networks.In order to improve the quality of P2P streaming delivery over wireless mesh networks,by integrating the wireless interference model and media streaming rate-distortion model into consideration,the cross-layer multi-source multi-path multicast scheme is proposed and the genetic algorithm is employed to implement the scheme.Comparing to the multi-source multi-path unicast scheme,the multi-source multi-path multicast scheme adopts the wireless networks' character that the data is transmitted by broadcasting and can effectively decrease the streaming transmitting interfering probability.The simulation results shows that the multi-source multi-path multicast scheme can effectively decrease the total rate-distortion of P2P media streaming delivery over wireless mesh networks by comparing to the multi-source multi-path unicast scheme.

Embeded system has weak computer power and small storage.In order to reduce control information and scheduling time,this paper presents a scheduling algorithm based on Coolstreaming scheduling policy,analyzes data scheduling policy using new exchange mechanism and heuristic algorithm.The new algorithm is properly designed according to the characteristic of STB and application environment of IPTV.The test result shows that the scheduling algorithm used in embedded system can reduce the overhead of peers efficiently and provide high quality live streaming service to vast number of STB users.

Media streaming delivery in wireless ad hoc networks is challenging due to the stringent resource restrictions, potential high loss rate and the decentralized architecture. To support long and high-quality streams, one viable approach is that a media stream is partitioned into segments, and then the segments are replicated in a network and served in a peer-to-peer fashion, however, the searching strategy for segments is one key problem with the approach. This paper proposes a hybrid ant-inspired search algorithm (HASA) for P2P media streaming distribution in Ad Hoc networks. It takes the advantages of random walkers and ant-inspired algorithms for search in unstructured P2P networks, such as low transmitting latency and less redundant query messages. We quantify the performance of our scheme in terms of response time and network query messages for media streaming distribution. Simulation results show that it can effectively improve the Search Efficiency for P2P media streaming distribution in Ad Hoc networks.