用位移传感器测量固体材料的杨氏模量

介绍了一种用位移传感器测量固体材料的杨氏模量的方法,是一种学生了解和掌握微小位移的非电量电测方法.     

Improved Feistel-based ciphers for wireless sensor network security

Wireless sensor networks （WSNs） are exposed to a variety of attacks. The quality and complexity of attacks are rising day by day. The proposed work aims at showing how the complexity of modern attacks is growing accordingly, leading to a similar rise in methods of resistance. Limitations in computational and battery power in sensor nodes are constraints on the diversity of security mechanisms. We must apply only suitable mechanisms to WSN where our approach was motivated by the application of an improved Feistel scheme. The modified accelerated-cipher design uses data-dependent permutations, and can be used for fast hardware, firmware, software and WSN encryption systems. The approach presented showed that ciphers using this approach are less likely to suffer intrusion of differential cryptanalysis than currently used popular WSN ciphers like DES, Camellia and so on.     

Reliable energy-efficient routing with novel route update in wireless sensor networks

In this paper we introduce a novel energy-aware routing protocol REPU （reliable, efficient with path update）, which provides reliability and energy efficiency in data delivery. REPU utilizes the residual energy available in the nodes and the received signal strength of the nodes to identify the best possible route to the destination. Reliability is achieved by selecting a number of intermediate nodes as waypoints and the route is divided into smaller segments by the way-points. One distinct advantage of this model is that when a node on the route moves out or fails, instead of discarding the whole original route, only the two way-point nodes of the broken segment are used to find a new path. REPU outperforms traditional schemes by establishing an energy-efficient path and also takes care of efficient route maintenance. Simulation results show that this routing scheme achieves much higher performance than the classical routing protocols, even in the presence of high node density, and overcomes simultaneous packet forwarding.     

面向工程应用的无线传感器网络综合实验设计

无线传感器网络课程的知识点包括了从感知层的硬件构成到应用层的安全设置。分析了目前无线传感器网络实验教学过程中存在的问题,提出了面向工程应用的无线传感器网络实验教学的必要性,详细设计了一个以“基于物联网的水产养殖监控系统开发”为工程应用背景的无线传感器网络的综合实验方案,给出了实验成绩的考核方法,取得了很好的实验效果。     

感测技术及应用课堂与实验的一体化改革实践

针对感测技术及应用课程教学存在的问题,从课堂讲授、实验教学等方面实施全方位的教学改革建设,课堂教学强化与其他课程之间的联系,帮助学生建立系统性整体性的专业认知,全面建设形成演示基础类—提高类—综合类层次化实验教学体系。实践表明,教学改革激发了学生学习课程的积极性,提高了课程教学质量并促进了大学生的工程应用能力发展。     

基于AT89C52单片机的超声波测距器设计

目前国内超声波测距器的设计大多采用汇编语言设计。由于单片机应用系统的日趋复杂。要求所写的代码规范化,模块化,并便于多人以软件工程的形式进行协同开发,汇编语言作为传统的单片机应用系统的编程语言,已经不能满足这样的实际需要了,而C语言以其结构化和能产生高效代码满足了这样的需求,成为电子工程师进行单片机系统编程时的首先编程语言。本设计就是一种基于AT89C52单片机、采用C语言和汇编语言混合编程来实现的超声波测距器。该文较详细地论述了采用单片机技术研制而成的泊车用超声波测距仪的基本原理。测量计算方法,实现方案。使用它,可以极大的提高泊车时的安全性。     

无线传感器网络路由的比较

介绍了无线传感器网络的特点及应用前景和研究的关注点;阐述了无线传感器网络的体系结构,同时进行了典型无线传感器网络路由协议的研究和比较;最后提出了在不断深入研究无线传感器网络路由协议的同时也要关注网络拓扑控制、网络安全、定位技术等关键技术。     

Identifying students’ difficulties when learning technical skills via a wireless sensor network

Practical training and actual application of acquired knowledge and techniques are crucial for the learning of technical skills. We established a wireless sensor network system (WSNS) based on the 5E learning cycle in a practical learning environment to improve students’ reflective abilities and to reduce difficulties for the learning of technical skills. Student learning was investigated using a Technical Expertise Assessment Form and Reflective Abilities Investigation Tool that we had developed. Results of the forms showed that the 5E learning cycle-based WSNS helped improve students’ reflection and the ease in acquiring technical skills. Students’ reflection was also shown to be significantly correlated with the learning of technical skills. We concluded that reflection provided by the sensory functions of the WSNS was able to reduce students’ difficulties when learning technical skills.     

基于PLC控制的导盲小车

基于功能强大的工控元件可编程序控制器（PLC）开发的盲人行走引导系统——导盲小车，由不同部位的传感器所探测到的障碍信号，通过编程，经由PLC处理后，输出语音信号，指导使用者在小车的引导下准确越过障碍。     

基于无线传感器的远程实时监控与固件更新系统设计

针对工业生产中难以监控传感器状态的问题,设计一个物联网系统,实现远程传感器数据监控与固件更新。该系统由远程实时监控系统与远程固件更新系统组成,传感器采用嵌入式实时操作系统。在远程实时监控系统中,传感器可调节频率测量数据,基于消息排队遥测传输协议,通过无线网络将数据传输到服务器。为使远程固件更新系统运行符合限制应用协议,传感器连接至轻量级物联网协议服务器,再通过网关连接到hawkBit服务器中,基于超文本传输协议与轮询方式,由hawkBit提供远程更新服务。实践操作表明,该系统操作简单,具有可视化、直观的优点,可满足大型工厂远程实时监控与固件更新需求。