基于区域神经网络的TFT-LCD电路缺陷检测方法

对薄膜晶体管液晶显示器(TFT-LCD)边框电路中细微、复杂的缺陷进行检测,一直是自动光学检测(AOI)的一个难点。本文提出基于改进的快速区域神经网络(Faster R-CNN)算法对TFT-LCD边框电路的缺陷进行检测。首先在共享卷积层进行特征提取,然后通过多层的区域提议网络结构生成精确候选区域,根据候选区域的特征和目标分类实现对缺陷的识别和定位。同时设计多种有效的网络结构并详细分析网络层深度及卷积核大小对检测效果的影响,最后进行不同算法的比较。在实际构建的数据集上实验,结果表明本文方法具有良好的检测效果,对6种类别的液晶屏边框电路缺陷识别定位达到平均每张0.12 s的检测速度和94.6%的准确率。福建省高校产学合作项目(2016H6026

一种基于差分进化神经网络的模糊控制方法

在模糊控制的实际应用中,隶属函数的选取往往依靠专家经验设定。这使得模糊控制由于隶属函数设定复杂,加大了实际应用的难度,往往达不到较好的控制效果。本文从RBF神经网络的特点出发,使用差分进化算法分成两个部分来优化RBF神经网络的参数,使之可以自动设置模糊控制的隶属函数。再通过模糊控制实时调整的PID控制器的三个参数,并分别对二阶系统和倒立摆系统进行仿真模拟。简化了模糊控制的设置方法,提高了进化算法在优化神经网络参数过程中的计算效率,取得了较好的控制效果。福建省高校产学合作项目(2016H6026

Wireless Dual-band Bandpass Filter Design Based on Hybrid Parameter Elements

提出一种基于混合参数元件设计双频带通滤波器的方法,并采用该方法进行gSM(890--960 MHz)/dCS(1 710--1 880 MHz)无线双频带通滤波器的设计。经过AdS仿真设计,并制作出测量的样品实物,样品实物的测量结果和仿真结果吻合,说明该方法的可行性;同时分析该方法的优点和适用范围,对实际工程应用具有重要的参考意义。A method of designing a dual-band bandpass filter based on hybrid parameter elements is proposed,and GSM(890--960 MHz)/DCS(1 710--1 880 MHz) dual-band bandpass filter is designed using this method.Actual measured results of the filter sample are in good agreement with simulated results.This method is meaning for application of engineering.福建省自然科学基金资助项目(2008J0031

Application study on refining citral from Litsea cubeba oil by the short-path distillation technology

研究了短程蒸馏技术分离提纯山苍子油中柠檬醛的工艺条件,通过改变短程蒸馏的加热温度和蒸馏压力,以调整短程蒸馏馏余物收率和柠檬醛浓度。通过定量调查馏出物收率与馏出物中柠檬醛质量分数的相互关系,以及馏余物收率与馏余物中柠檬醛质量分数的相互关系,探讨了馏余物收率对短程蒸馏山苍子油提纯柠檬醛分离效果的影响;从馏余物收率与柠檬醛收率的相互影响关系出发,并结合目前山苍子油中分离柠檬醛的实际工业生产状况和市场状况,获取了使用短程蒸馏山苍子油分离柠檬醛的适当馏余物收率及操作状况。Technical conditions for refining citral from Litsea cubeba oil by short-path distillation are investigated through experiments.The residue yield of the short-path distillation and the mass fraction of citral in the residue are adjusted by changing either the heating temperature or the distillation pressure.Influence of the residue yield on separation effect of citral is discussed by comparing the residue yield with the citral concentration in the residue and comparing the distillate yield with the citral concentration in the distillate.Moreover,the citral yield in the short-path distillation is compared with the residue yield in order to recover citral as more as possible.Through combining the experimental results with the current production and market of the commercial citral,the optimal conditions and the residue yield of the short-path distillation for obtaining high-purity Citral are determined

Techniques and Applications in Wireless Mesh Networks

无线网状网(WMNs)由网状路由器节点和客户机节点组成,其中的网状路由器节点组成了无线网状网的网络骨干,其移动性很小。他们一起为无线网状网和其他常规无线网络的客户机节点提供网络的无线接入。WMNs技术结合了中心式控制的蜂窝网与分布式控制的无线自组织网的优点,可有效克服这两种技术的缺陷并显著提高无线网络的性能,已经成为下一代无线通信网络的研究热点之一。WMNs可为无线个域网、局域网、校园网、城域网的一系列应用提供高速无线宽带接入服务。虽然目前WMNs技术发展很快,但其协议栈各层仍存在许多有待研究的课题。首先简要介绍了无线网状网的结构与特点;随后重点分析了其主要的几个应用领域;最后探讨了WMNs各协议层的研究现状与关键技术,并分析了该技术存在的问题及未来的研究方向。Wireless Mesh Networks(WMN) consist of mesh routers and mesh clients,where mesh routers have minimal mobility and form the backbone of WMNs.They provide network access for both mesh and conventional clients.WMNs are anticipated to resolve the limitations and to significantly improve the performance of wireless Ad Hoc networks and mobile cellular networks.They are undergoing rapid progress and inspiring numerous deployments.WMNs will deliver wireless broadband services access for a large variety of applications in personal,local,campus,and metropolitan areas.Despite recent advances in WMNs,many research challenges remain in all protocol layers.This paper presents a detailed study on recent advances and application scenarios in WMNs,followed by discussing the system architectures and characteristics briefly.Finally,recent research and advanced techniques of each protocol layer are described,and some open issues are analyzed

Modified Power Control Approach Based on CSMA/CA of Wireless Ad hoc Network

基于CSMA/CA机制,提出了一个改进的功率控制算法,用于解决传统的bASIC方案中,由于功率控制的引入而产生的非对称链路对节点传输的碰撞问题,它通过简单地修改802.11MAC层协议,采用变长的rTS/CTS来使载波侦听环中的节点获得关于dATA/ACk传输的分组大小及功率强度信息,从而有效地避免碰撞与重传。仿真结果说明,该方法不仅可以节省能量,而且可以提高网络性能。Based on CSMA/CA scheme,an improved power control algorithm was proposed to solve the Asymmetric Link Problem introduced by power control of BASIC in Ad Hoc networks,which modified 802.11 MAC protocol by using variable size of RTS/CTS to gain the information of data size and power level in the area of carrier sense ring to avoid more collisions and retransmissions.Simulation result shows that the approach can not only save network energy,but also improve network performance.福建省青年创新基金资助项目(2006F3097);福建省自然科学基金资助项目(A0710022);集美大学优秀青年骨干教师基金资助项目(2008B002

Design of cross-layer security for wireless sensor network's

无线传感器网络(WSNs)发展迅速,可广泛应用于军事、工业及科学等领域。传感器网络在无线信道中工作,其节点有限的能源、计算能力、存储能力使得其面临着严重的安全问题。已提出的许多安全方法都基于分层设计的概念。分析了分层安全设计的局限性,回顾了现存的W SNs的安全设计方案,提出了一些新的跨层解决办法,并指出了传感器网络中跨层安全的研究方向。Wireless sensor networks(WSNs) are developing rapidly,it will be employed in a wide variety of applications ranging from military,industrial and social.Due to their constraints in computation,memory,and power resources,security is a challenge in these networks.Many security methods of WSNs based on the concept of layered-design have the limit,the state of art security design method of WSNs is overviewed,several new cross-layer solve methods are proposed,and the research direction of cross-layer design for the security of WSNs is point out.福建省自然科学基金资助项目(A00440004

Energy Saving Route Finding Mechanism in Underwater Acoustic Sensor Networks

提出了水声传感网中能量有效的路由方案.结合水声信道的特点对水下传感网中的能耗因素进行分析,得出给定源宿节点之间的距离时路径消耗总能量与中继节点数的关系.对定向扩散协议进行改进,在初始化阶段根据汇聚节点和邻居节点的地理信息,求出源节点到目的节点的理想的最优能量路径.仿真结果证明,该方案能减少洪泛,只需选择1条较优路径,有效地节省了能量.An energy-efficient routing scheme is presented for underwater acoustic sensor networks(UW-ASN).Firstly,the factors affecting energy consumption in UW-ASN are analyzed in light of underwater channels,the relationship between numbers of relay nodes and energy consumption is obtained for given source-destination distance.The directed diffusion routing scheme is modified in the initial diffusion phase to find the optimal route based on the geographic information between a sink node and its neighboring nodes.Simulation shows that the proposed scheme can reduce the flooding cost,select an energy-efficient route,and save more energy.国家自然科学基金项目(60672046);集美大学优秀青年骨干教师基金项目(2008B002

基于卷积神经网络的电路缺陷识别方法

电子线路上产生的缺陷由于形状不规则、边缘模糊等特点,传统图像算法难以达到高精度的检测要求。本文提出基于深度学习的卷积神经网络对电路缺陷进行识别检测。首先利用直方图均衡化对输入的图像预处理,增强对比度和清晰度,然后在8层的卷积神经网络结构上对图像进行特征提取,最后通过softmax分类器实现对图像特征的识别和分类。在实际采集的电子线路图像数据集上实验表明,本文算法具有较高的准确率,能有效识别各类电子线路缺陷。福建省高校产学合作项目(No.2016H6026

基于随机动力响应时程统计指标的结构损伤初步识别

本文以八层剪切型钢框架模型在白噪声激励作用下的随机振动实验为基础,分别从结构加速度响应的均值、方差、偏度、峰度、概率密度函数和累积分布函数等多个统计特征,对结构无损及9种模拟损伤工况进行识别,结果表明:结构随机振动加速度响应时程的偏度和峰度对结构损伤的表征效果不明显,而概率密度函数能初步判别损伤,方差指标在进行损伤判别的基础上,具有良好的损伤定位能力.国家自然科学基金青年科学基金项目(51508486)福建省自然科学基金青年创新基金项目(2016J05136)厦门市交通基础设施智能管养工程技术研究中心开放基金项目(TCIMI201806)~