Measurement of the Waveguide Near—field Optical Spot

The characteristic of near-field spots is analyzed.The size of the near field and the heat response time of the hybrid record medium to overcome super paramagnetic effect are calculated based on the heat transfer theory.A novel measuring method for the diameter of near-field recording spot is also presented.Since the grain of the recording media is tiny enough,near-field optical lithography can be accomplished with the aid of atomic force microscope(AFM).The diameter of near-field recording sopt can be obtained by specifically designed computer.So the relationship between the near-field recording spot diameter and the probe size of near-field recording system,the near field recording distance coupling between head and disc can be got.     

基于Delphi的文本数据文件的处理

介绍了IP话费查询系统，针对系统的文本数据文件导入数据库模块和基于用户名的话费查询模块的关键技术作了详细的分析。同时着重介绍了一种采用Delphi开发软件将话单文本文件导入数据库的方法，实验结果表明此方法易于系统管理人员的操作，也使得系统具有较高的灵活性和可靠性。     

InfiniBand交换网路由表目的重命名算法的研究与实现

文章针对InfiniBand路由表按目的ID确定输出通道的要求，在up*／down*路由算法计算出的全局路径表的基础上，给出了一种使用目的重命名生成路由表的算法。由于保持了up*／down*路由算法的良好特性，因此它是一种适用于任意网络拓扑的IBA并且保证无死锁的路由表生成算法。最后还分析了该算法对路由表的规模，目的ID的影响和可避免的冲突数三项性能指标。     

超电大复杂目标RCS缩比模型预估方法

本文提出用缩比模型计算电大目标雷达散射截面（RCS）的理论。通过复杂目标近远场电磁散射理论模型的分析得到，目标的雷达截面和目标的几何尺寸及工作波长有关系。当电尺寸相同时，目标雷达散射截面和其几何尺寸的平方成正比，缩比模型计算既适用于近场，也适用于远场。     

交换机故障类型及分析方法

介绍了程控交换机常出现的故障类型并通过实例介绍了交换机出现故障后分析故障的方法。     

21~28GHz波段平衡式放大器

采用OMM IC的0.2μm PHEM T工艺设计了工作在21~28 GH z的平衡式放大器。正交耦合电桥采用兰格电桥。兰格电桥和平衡式放大器的在片测试结果和仿真结果基本吻合,平衡式放大器在21~28 GH z的增益为18~20 dB,输入和输出回波损耗小于-20 dB,在26 GH z处的输出1 dB压缩点功率为21 dBm。     

C波段微波低相位噪声介质振荡源

介绍了微波低相位噪声介质振荡器的设计方法。就影响介质振荡器相位噪声的因素进行了讨论,从谐振回路有载Q值、有源器件、增益压缩量、电路模式等几个方面提出了降低相位噪声的方法,并给出了一个C波段微波低相噪振荡器的设计实例。测试结果表明:该振荡器工作频率3 900 MH z,输出功率大于10 dBm,相位噪声达到-102 dB c/H z@1 kH z;-128 dB c/H z@10 kH z。     

基于光纤布喇格光栅和马赫-曾德尔干涉仪的新型ROADM

讨论了单极的基于光纤布喇格光栅的马赫-曾德尔干涉仪(MZ-FBG)的串联OADM,并且在单极的MZ-FBG基础上加入光开关和合波器进行改进,设计了一种新型的并联ROADM.这种结构的ROADM避免了串联OADM缺乏可控机制和保护功能的缺点,具有很大的可扩展性.为验证该结构的优越性,设计并分析了4级并联的ROADM,实验结果表明,该ROADM在直通状态、下载状态和上载状态下的平均插入损耗均小于3dB,信号间的隔离度大于20dB.最后讨论了影响该结构的ROADM性能的主要因素.     

二维同步OCDMA系统的性能分析

构造了一种用于二维同步光码分多址(OCDMA)系统的修正素数跳频码(MPC/PC),分析了码字的自相关和互相关性能,研究了二维同步OCDMA系统的误码率和吞吐量性能.结果表明,与一维同步OCDMA系统相比,二维同步OCDMA系统的可接入用户数大大增加,误码率大大降低,吞吐量明显提高.     

Shape statistics variational approach for the outer contour segmentation of left ventricle MR images.

Segmentation of left ventricles is one of the important research topics in cardiac magnetic resonance (MR) imaging. The segmentation precision influences the authenticity of ventricular motion reconstruction. In left ventricle MR images, the weak and broken boundary increases the difficulty of segmenting the outer contour precisely. In this paper, we present an improved shape statistics variational approach for the outer contour segmentation of left ventricle MR images. We use the Mumford-Shah model in an object feature space and incorporate the shape statistics and an edge image to the variational framework. The introduction of shape statistics can improve the segmentation with broken boundaries. The edge image can enhance the weak boundary and thus improve the segmentation precision. The generation of the object feature image, which has homogenous "intensities" in the left ventricle, facilitates the application of the Mumford-Shah model. A comparison of mean absolute distance analysis between different contours generated with our algorithm and that generated by hand demonstrated that our method can achieve a higher segmentation precision and a better stability than various approaches. It is a semiautomatic way for the segmentation of the outer contour of the left ventricle in clinical applications.