Aircraft recognition based on improved iterative threshold selection and skeleton Zernike moment

Using the visible optics images to identify targets is an important part in the development of remote sensing technology. In this paper, a new aircraft recognition method based on the improved iterative threshold selection and the skeleton Zernike moment is presented. The method segment aircraft targets under complex background using iterative threshold selection with between-class distance and scatter, and calculate the skeleton Zernike moment for the aircraft target recognition using template matching method. The experimental results show that the new method can effectively achieve the target segmentation under complex backgrounds, and provide a satisfactory performance both in recognition rate and recognition speed.     

Low-cost amplitude mask for long-period grating fabrication

A novel method is presented that use the RZJ-304 positive photoresist to construct an array as amplitude mask to writing long period gratings, and for a protective effect when fabricate aluminum ring array as amplitude mask. Results show that the long period gratings’ transmission spectra are good with different types of processing methods. In this way, the processing methods we demonstrate are suitable for processing long period gratings.     

Automatic method of fruit object extraction under complex agricultural background for vision system of fruit picking robot

Fruit picking robot is required for agricultural automation for fruit harvest, and vision system is the important and crucial composition of a robot system. An automatic extraction method of fruit object under complex agricultural background for vision system in fruit picking robot is presented in this study. The method is based on an improving Otsu threshold algorithm using a new feature in OHTA color space. Color features are extracted in OHTA color space and then used as an input for the Otsu threshold algorithm which calculates the segmentation threshold value automatically. Four kinds of fruit images are selected to validate the automatic extraction method. The fruit objects are automatically extracted with this method and the outputs are presented in binary images. Numerous of experiments show that the automatic extraction method can extract mature fruit from complex agricultural background and the extraction accuracy is more than 95%. The results indicate an effective fruit object extraction method for vision system of fruit picking robot.     

压力交换器压力脉动频域与转子转速特征分析

压力交换器的转子和端盖的相对运动,使流体在端盖和转子内的流动相互干涉,从而引起周期性压力脉动.本文利用RNGκ-ε湍流模型,在转动与静止部件之间采用滑移网格技术建立交互界面,对压力交换器内动静干扰引起的三维非定常湍流进行了计算。通过对端盖内压力脉动的监测发现,其压力呈周期性波动,通过对压力的频谱进行分析发现,各点的压力脉动的主频就是孔道通过频率.这说明利用分析压力脉动的方法提取转速是可行的。     

基于关联基的壳模型截断计算

提出了一种新的用于壳模型截断计算的基矢空间的构建方法,即关联基的方法。关联基是利用壳模型中每个粒子数分布下哈密顿量的本征态作为基矢。在此基矢之上,可以很自然地通过考虑能量相对较低的关联基矢进行相应的截断计算。当所有的关联基矢都被考虑时,计算结果回到一般jj耦合给出的结果。最后,对关联基下壳模型的计算与标准的壳模型计算进行了比较,计算结果表明,关联基下壳模型能量和波函数有着良好的收敛性,同时表明关联基计算的有效性。     

保费再投资下带干扰的COX风险模型的破产概率

基于经典的风险模型,考虑了对于保费进行稳健投资的情况,同时加入了用布朗运动来描述的干扰因素,引入了保费再投资下带干扰的Cox风险模型.利用鞅方法得到了该模型破产概率的Lundberg不等式.     

基于流形距离的量子进化聚类算法

基于量子计算的机理和特性,并结合进化计算,本文提出了一种新颖的量子进化聚类算法(QEAM),在该聚类算法中引入了一种新的距离测度函数——流形距离.新方法将聚类归属为优化问题,通过运用量子进化的机理更快地搜索到最优聚类中心,从而得到最优隶属度矩阵划分;同时,通过基于流形距离的相似性度量,有效利用样本所具有的全局一致性信息...     

无线并行放大转发中继传输中基于信噪比的功率分配研究

在无线通信网中,高效的功率分配可显著降低资源消耗、获得更好的服务质量、并减少网络内干扰.本文以无线并行中继协作通信系统为背景,在目的节点目标信噪比的约束条件下,对如何最小化中继链路中各通信节点的发射功率进行了研究.文章首先建立了无线中继协作通信系统模型,推导出了无线中继协作通信系统中信噪比的表达式.接着,文章将功率分配...     

异构多核处理器分支预测器研究与设计

为解决单核处理器时钟频率难以提高、处理器功耗逐渐增加等问题,文中提出了一种新型异构多核处理器的设计方案．该结构中增加了B--Cache结构和C--Core控制器,这种新型异构多核处理器避免了流水线因分支预测失误而flush,提高了整个处理器执行效率．     

基于量子免疫克隆聚类的SAR图像变化检测

传统的基于进化聚类方法在处理变化检测时耗时过长,在搜索最优聚类中心过程中容易陷入局部最优,对于SAR图像的变化检测存在边缘定位不够准确的缺点,提出了基于量子免疫克隆聚类的SAR图像变化检测方法.把图像的灰度值作为输入信息,通过量子比特定义聚类中心,通过量子免疫克隆算法来搜索最优聚类中心,从而得到更佳的全局阈值,最后根据...