A retunable PID multi-rate controller for a networked control system

This paper introduces a control strategy based on retuning a multi-rate PID controller in accordance with the variable delays detected in a networked control system, in order to avoid a decreased control performance. The basic idea is minimising the first-order Taylor terms of a performance measure via gain scheduling, i.e., making the controller gains delay dependent. As network delay is time-variant, the stability of this control approach will be proved by means of linear matrix inequalities.     

公钥密码系统中的硬件二元域求逆模块

针对二元域上基本运算求逆操作的复杂性问题,将软件应用中效率较高的求逆算法移植到现场可编程门阵列中,利用其分步特点获取较低延迟,并采用度数和乘法的规律性对执行周期进行缩减,以较小的硬件开销增量换取较大的性能提高。仿真实验结果表明,该模块能够适用于多个二元域及软件求逆。     

UWB系统中（解）交织器低复杂度的实现

提出一种低复杂度的（解）交织器现场可编程门阵列实现方法,采用Xilinx FPGA自带的双端口存储器,能有效降低FPGA资源的消耗,且输入位宽和输出位宽无需相同,适用于多带正交频分复用超宽带系统。实验结果表明,系统所占用的slices数目对于交织器和解交织器来说分别降低了46％和78％。     

基于SOPC及图形加速引擎的座舱显示系统

提出一种基于可编程片上系统和图形加速引擎的飞机座舱综合显示系统设计方案。为避免图形加速引擎直接对帧存储器进行零碎操作导致的存储器操作瓶颈,引入图形缓存机制。根据图形像素的存储特点提出“远区域优先”图形缓存页面淘汰算法。对汉字及自定义位图等操作采取软硬件结合的方式达到系统性能和资源利用的平衡,利用硬件锁保证帧存储器一致性。通过对模块进行波形仿真实现系统级仿真结果的可视化验证。     

Using social media to enrich information systems field trip experiences: Students’ satisfaction and continuance intentions

A well-designed field trip can promote active learning and reinforce classroom materials. Few studies have examined the potential for social media to enhance IS field trip experiences by promoting active and collaborative learning. One major barrier to the exploitation of this potential is the lack of the adoption of social media by students as a learning tool to enhance field trip experiences. Therefore, the first task is to understand how to increase the satisfaction of students in their use of social media to enhance IS field trips. This research sets out to understand the factors that could help increase students’ satisfaction with the use of social media to enhance IS field trips, and thereby their intentions to continue to use social media in future field trips. The results show that to increase user satisfaction, course instructors should ensure that students perceive the social media sites used for enhancing field trip study to be trustworthy, effortless, useful and accepted by their peers. Future research could determine how we can incorporate the use of social media to enhance the field trip learning experience.     

Investigation of Raman enhancement in hydrothermally roughened SERS-active substrates

In this work, we study surface enhanced Raman spectroscopy (SERS) active substrates for the detection of Rhodamine 6G. To examine the electromagnetic enhancement, we apply the finite-difference time-domain (FDTD) algorithm to analyze the structures by solving a set of coupled Maxwell's equations (Ampere's Law and Faraday's Law) in differential form. The field enhancements are thus investigated in the visible regime with the wavelength of 633 nm. In our experimental measurement, the surface enhanced Raman scattering signals from the surface of substrates with 12-hour treatment and without treatment are performed and compared. Through the three-dimensional (3D) FDTD calculation, we find that the hydrothermally 12-hour treated samples possess significantly vertical variations of surface and thus have relatively larger field enhancement than those without treated. Consequently, it implies a strong positive effect on the surface enhancement which is consistent with the measured intensity.     

物理层网络编码研究进展

在无线协作环境下,充分利用无线电磁波的广播特性进行物理层网络编码(PLNC)可获得更大的吞吐量和频谱利用率。在物理层网络编码基本思想的基础上,首先着重介绍三类物理层网络编码技术--有限域上的物理层网络编码、模拟网络编码和复数域上的网络编码,给出它们相关理论的研究现状,并对与此相结合的新技术进行了介绍;然后论述目前物理层网络编码应用实现的现状;最后对物理层网络编码相关理论及其应用实现的发展趋势进行了分析与展望。物理层网络编码理论的进一步完善,相关安全性的研究,以及与协作通信理论,如信道编码与调制、中继选择、调度及资源分配等进一步紧密结合等,将是其研究的重要趋势。     

APACS353在压缩机控制系统中的应用

介绍ＡＰＡＣＳ３５３智能控制器及其在离心压缩机控制系统中的应用,具体介绍ＡＰＡＣＳ３５３智能控制器特点,压缩机控制系统及系统应用实例等。     

一种嵌信式微机数据采集系统的实现

主要讨论一个嵌入式微处理机数据采集系统的软／硬件设计方案。     

用Ethernet＋TCP／IP构建现场实时通信网络平台

分析了Ethernet和TCP／IP技术给现场实时通信网络带来的影响,介绍了具有Ethernet网络接口和TCP／IP协议功能的现场智能设备的硬件组成、通令协议层次模型、协议构成和协议数据格式,描述了现场智能设备中发送和接收数据的实现过程。