龙芯处理器商用密码指令集运算性能分析

文章介绍了龙芯处理器3A5000内置硬件加密模块,支持商用密码SM2/3/4,通过搭建测试环境,对龙芯3A5000处理器运算SM2/3/4算法的速度和吞吐量进行了测试,并与其他8款市面上主流的处理器进行了比较;对测试结果进行了分析,根据英特尔CPU的指令集机制进行了估算,与上一代处理器进行了对比,并对下一代处理器进行了展望。     

基于压电效应的能量收集

介绍了利用压电陶瓷元素进行能量收集,并对其进行了理论分析.为能对负载进行供电,使用DC-DC变换器对电压进行变换,同时增加了输出功率.最后实验结果对前面的模型理论分析进行了验证.     

光纤通信中的MEMS外腔可调谐激光器技术

文中对目前的基于MEMS技术的外腔激光器进行了深入探讨,并对典型的MEMS外腔激光器从结构进行了分类探讨,并进行了详细说明。另外,从激光器理论角度对MEMS结构的激光器的参数和影响因素进行了分析。最后,对当前的研究现状进行了简要总结,并对基于MEMS技术的外腔可调谐激光器技术进行了展望和预测。     

移动互联网发展技术与安全分析

从移动互联网的定义、目标、基础协议等方面对移动互联网进行了概述,对其发展方向和趋势进行了探讨,对移动互联网的3种热点技术进行了介绍,最后对移动互联网的安全框架、安全机制进行了分析,并对其安全问题进行了展望。     

基于单片机的脑波治疗仪的软件设计研究

介绍了一种基于单片机的脑波治疗仪的软件设计方案。文中对系统的整体设计进行了简要介绍,着重对脑波诱导音乐的软件设计进行了分析。最后对系统输出脑波诱导波进行了测试并对出现的误差进行了讨论,实验证明该设计方案可行。     

EoC技术新进展

为配合全国有线电视双向化改造工作,广播电视规划院对EPON和EoC技术进行了测试评估．目前的评估进展情况为：对全国有线电视网络质量情况进行了调查,对国内外EPON的应用情况进行了调查．对EPON和EoC的技术现状进行了总结．对有线电视分配网信道状况进行了调查．对8家EPON产品和11家EoC的产品进行了测试和评估。     

喷墨打印机用墨水的组成及其主要性能指标分析

对墨水的组成进行了详细介绍,并对各组分的作用进行了透彻的剖析,对其主要性能指标进行了具体的分析。     

Drupal工作原理解析

重点对Drupal的工作原理进行了深入的剖析。对drupal的应用领域和它的优点进行了详细说明。对drupal的核心元素进行了详细的介绍和说明。最后,重点对drupal的主题覆写机制进行了说明,并对drupal主题覆写流程进行了深入分析。     

“计算机组成原理”设计性实践教学模式研究

本文阐述了"计算机组成原理"设计性实验教学的重要性,对设计性实验教学的目的和基本特征进行了归纳,对"计算机组成原理"设计性实验教学的现状进行了调查,对存在的问题进行了较深入的分析;在此基础上.对组成原理设计性实验的教学模式进行了研究,对设计性实验的体系进行了初步设计,并对"计算机组成原理"设计性实验的实施方法进行了探讨.     

群智能算法的研究现状和发展趋势

对近年来的群智能算法发展现状进行了简要的介绍,针对关注度较高的几种群智能算法进行了对比分析和简介。通过分析,提出了群智能算法的共性特征,并对算法的主要更新方式进行了分析对比,最后对群智能优化算法的未来发展进行了展望。     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

避免MOS管在测试时受EOS损坏的方法

由于MOS管是浅结系列产品,极有可能在测试时遭到静电击穿或过压过流而损坏。文中主要介绍MOS管在测试过程中,会造成实际测试时器件加上了允许的最大电压、电流或功率而导致器件损坏的情况。例如,在测试过程中电源连接不良,测试片与器件接触不良,管脚接错,在测试程序中未设置正确的电压和电流钳位或DUT板损坏等。然后,针对此类现象的发生,提出了在测试过程中应采取的相应措施,从而有效地保证产品质量。     

一种改善LED背光亮度均匀性的新型反射膜研究

在LCD的LED背光腔体的底面设计了新型曲面形状及性能的反光膜,将扩散膜反射回灯腔底部的光重新反射回出光口以改善亮度均匀性能;在侧面设计了镜面反射膜,将位于LED矩阵边缘区域由LED射向灯腔侧壁的光反射重新射向出光口,增加了LED背光边缘区域的亮度,从而改善了背光边缘区域较暗的亮度不均匀状况.根据此类反射膜的设计完成了反射膜的制备,并应用于38 cm LED背光源样品.测试结果显示,设置反射膜的LED背光的亮度均匀性值为10.2%,明显优于未设置反射膜的值16.8%,亮度提高了29%左右,表明该种新型反射膜可以提高亮度并改善亮度均匀性.     

圆球微腔对水蒸汽的敏感特性仿真实验研究

研究了圆球微腔在水蒸汽传感中应用的可行性。通过测试在有/无水蒸汽的气室环境下,圆球微腔透射光谱的变化来对气室水蒸汽浓度情况进行传感测试。仿真实验结果显示:在有无水蒸汽干扰的条件下系统输出光强有明显的变化,即研制基于圆球微腔的传感器是可行的。     

位屏蔽多叉树搜索射频识别防碰撞算法

针对RFID树型防碰撞算法中时隙数多、数据通行量大等问题,提出了一种改进的多叉树防碰撞算法,阅读器准确检测碰撞位并向标签反馈碰撞位信息,标签对阅读器已知的ID位进行屏蔽,把ID号转换成连续碰撞的序列号.阅读器利用屏蔽位信息和标签返回的碰撞位编码信息,对标签进行分层分类搜索.通过对标签ID进行屏蔽,阅读器和标签间仅发送对方不知道的碰撞位信息.该算法减少了碰撞时隙和识别时隙,避免了空闲时隙,减少了阅读器和标签间的数据通信量.理论分析和仿真结果表明,该算法减少了系统的时隙总数和数据通信量,提高了阅读器的识别效率.     

Characteristics of gradually doped LWIR diodes by hydrogenation

The hydrogenation effects on HgCdTe diode performance are presented and the mechanism of hydrogenation is revealed. By the hydrogenation, R₀A is increased by 30 times and photo-response is also improved. It is supposed that these are explained by the increased minority carrier lifetime by the hydrogenation. However, it is found from LBIC measurements that the minority carrier lifetime doesn’t increase by the hydrogenation. An important clue that explains the hydrogenation effects is found from Hall measurements. It is found that, after the hydrogenation, the doping concentration of Hg-vacancy doped substrate decreases and the mobility increases. For the heavily hydrogenated bulk substrate, it is also found that the hydrogen passivates the whole Hg-vacancy and reveals the residual impurity and p-type doping concentration is exponentially graded. From these measurements, the diffusion current model of gradually doped diode is proposed. This model shows that the diffusion current of the graded junction diode is 2 orders of magnitude smaller than that of the abrupt junction diode, which clearly explains the R₀A increase by the hydrogenation. Medicisimulation to investigate the change of LBIC signal by the doping grading also coincides with the measurements. From these measurements and model, the hydrogenation effects are attributed to the grading of Hg-vacancy doped p-type substrate by the diffused hydrogen.     

RFID相关技术专利分析(三)

RFID技术作为一项重要的非接触式识别枝术,近来发展迅猛。本文对RFID天线相关的技术进行了专利战略分析,主要包括:RFID天线相关整体行业分析、RFID标签天线和制造工艺等三个方面,分析了如下主要指标:申请年度发展趋势、主要申请人地区分布、IPC分布、DWPI分布、主要申请人分布、核心专利排名、专利地图。根据分析结果,本文给出了分析结论,对相关企业在专利利用、保护和管理方面给出了建议与对策。     

Fabrication of holographic 3-D polymeric photonic crystals in near-infrared band and study of its optical property

A three-sidewalls-prism holographic method has been provided for the fabrication of 3-D fcc-type polymeric photonic crystal using negative photoresist. Special fabrication treatment has been introduced to ensure the stability of the fabricated nanostructures. The scanning electronic microscopy （SEM） and the diffraction results testified the good dependability of the fabricated structures. The simulation of the partial band structure is in good agreement with the transmission and reflection spectra obtained by Fourier transform infrared spectroscopy.     

Analysis of impurity concentration distributions in pulled semiconductor crystals

InSb and GaSb single crystals were grown by the Czochralski method. The impurity concentration distribution in the melt and crystal was investigated experimentally and computationally as a function of the interface segregation coefficient, the shape of the solid-liquid interface and the growth rate. It was found that the impurity concentration distribution in the melt was largely influenced by the interface segregation coefficient; the impurity concentration in the crystal increased as the shape of the solid-liquid interface became more planar and also as the growth rate increased; the impurity concentration was more markedly influenced by the growth rate than by the shape of the solid-liquid interface. When the growth rate was large, the impurity concentration increased and the shape of the solid-liquid interface was concave toward the melt near the crystal periphery. When the growth rate was small, the impurity concentration decreased and the shape of the solid-liquid interface was convex toward the melt.