基于加权合成核与三重Markov场的极化SAR图像分类方法

马尔可夫随机场(Markov Random Field,MRF)广泛用于处理遥感图像的分类问题,然而MRF在构建极化合成孔径雷达(Synthetic Aperture Radar,SAR)图像模型时未考虑其非平稳特性且对初始分类较为敏感,为此本文提出了一种基于加权合成核与三重马尔可夫随机场(Triplet Markov Field,TMF)的极化SAR图像分类方法.该方法依据训练样本在特征空间上的距离,提出了加权合成核函数权重系数的自适应确定方法以提高初始分类的精度和普适性;为充分考虑极化SAR图像的非平稳统计特性,利用TMF对极化SAR图像进行统计建模以实现贝叶斯分类.实验结果表明,与基于MRF的极化SAR图像分类方法相比,本文所提方法可获得更高的分类精度和更平滑的同质区域分类结果,而且本文方法能更好地保持图像边缘信息.     

统一接口平台在中国电信WDM综合网络管理系统中的应用

在分析了现有多厂商网络管理系统北向接口模式所存在问题的基础上,提出统一接口平台并实践应用于中国电信WDM综合网络管理系统,通过统一接口模型解决了不同厂商不同制式北向接口之间的差异性和不完备性,减少系统升级维护的开发难度和开发成本.通过应用统一接口平台,综合网络管理系统不必针对设备厂商的不同版本进行接口开发,只要在统一接口平台上进行适当的环境配置即可,可以快速地对新的干线进行监控,并缩短排除接口故障的时间,有效降低中国电信骨干网网管的开发和管理成本.     

基于Web的网络管理体系结构的研究和实现

分析了基于 Web 的网络管理的标准,结合实际提出一种基于 WEB/CORBA/SNMP 技术的网络管理体结构,并根据较为成熟的 Web 开发框架实现了该体系结构的 web 服务器。     

eTOM与ITIL融合方法研究

分析和比较eTOM与ITIL的特点,本文提出了两种实现eTOM与ITIL融合的方法——EIE和ITE。     

Dynamic evolution of transverse energy flow in focused asymmetric optical vector-vortex beams

We present here controlled generation of asymmetric optical vector-vortex beams using a two-mode optical fiber and study the dynamic evolution of the transverse energy flow (TEF) when focused through a spherical lens. The dependence of the TEF on various factors such as the vortex charge, vortex anisotropy and polarization structure around the vortex core is explored. It is found that the TEF is directly proportional to the phase gradient and its direction is governed by the vortex charge. The presence of C-point polarization singularity in the beam and the polarization structure around it results in vibrational phase gradient which is the major factor deciding the TEF in vector-vortex beams.     

建设广电多厂商传输监控系统

结合当前广电传输系统网管的现状,提出了一种建设多厂商传输监控系统的思路,并对关键技术给出了解决方案.     

分装式流水作业加工模型的性质及启发式算法研究

分装式流水作业(简记为TMF)加工模型是从生产实践中提炼出的新型的排序模型。由于文献[1][2]中已经证明该问题在一般情况下是NP-完全问题,没有多项式时间算法。在这篇论文中进一步讨论了该加工模型的性质,并提出了它的启发式算法以及启发式算法在最坏情况下的性能比的上界。     

基于CORBA技术的数据网管北向接口设计

首先介绍了CORBA技术,然后论述了北向接口的概念和在综合网络管理中存在的意义,最后针对数据网管在分布式网络管理北向接口设计问题,参考了TMF规范和划分"域"的网络管理组织结构,同时结合实际需求,利用CORBA技术给出了一种数据网管北向接口的结构模型,并对模型中的模块进行了详细说明.     

Study on arc mode and shape transformation in the arc motion stage between transverse magnetic field contacts

Transverse magnetic field (TMF) contacts drive the vacuum arc moving along the contact surface by producing a magnetic field perpendicular to the arc current flow, which makes the arc energy distribute uniformly and prevents the contact from serious ablation due to local overheating. The characteristics of arc motion between the TMF contacts directly determine the surface temperature distribution and contact erosion. Also, it is closely related to the breaking ability of the contacts. In this paper, the arc motion between spiral‐type contacts was recorded by a high‐speed camera. By analysing the arc voltage and arc images, the characteristics of arc shape transformation in the motion stage under different currents were studied. At the same time, the influence of arc duration and arc characteristics before the motion stage on the arc motion is discussed. It is found that the arc behaviour before the motion stage did influence the shape transformation and range of arc rotation. After entering the motion stage, there was always a rapid transformation process of the arc shape and the arc would return to where it first became constricted after a short movement. After a continuous movement, it might rotate in a small region where the arc stagnated before the motion stage. In addition, the arc behaviour was also related to its duration. When the opening time was varied from 2 to 5 ms, the arc velocity decreased. Meanwhile, it was more likely that multiple transformations of the arc aggregation degree occurred.     

Investigation on arc characteristics in cup-shaped contacts with different structure for transverse magnetic field vacuum circuit breaker

The cup-shaped transverse magnetic field (TMF) contacts contain radial components and tangential components in the TMF generated when the current is interrupted. The tangential force generated by the radial magnetic field component drives the vacuum arc to rotate, and the tangential magnetic field component generates a radial force that causes the vacuum arc to move radially outward. In this paper, in order to study the influence of the arc force direction on the arc characteristics, the influence of the contact structure parameters such as the inclination of the inner wall on the arc force direction is simulated, and the breaking tests of different levels of current are carried out on the contact with different structure parameters. It is found that the direction of the Lorentz force has a significant effect on the breaking characteristics of the current, and the tangential and radial force components have varying degrees of influence on the motion characteristics of the arc during the start process and the metal droplet splashing.