Evaluation of graded-channel SOI MOSFET operation at high temperatures

This paper presents a comparative analysis between graded-channel (GC) and conventional fully depleted SOI MOSFETs devices operating at high temperatures (up to 300 °C). The electrical characteristics such as threshold voltage and subthreshold slope were obtained experimentally and by two-dimensional numerical simulations. The results indicated that GC transistors present nearly the same behavior as the conventional SOI MOSFET devices with similar channel length. Experimental analysis of the g_m/I_DS ratio and Early voltage demonstrated that in GC devices the low-frequency open-loop gain is significantly improved in comparison to conventional SOI devices at room and at high-temperature due to the Early voltage increase. The multiplication factor and parasitic bipolar transistor gain obtained by two-dimensional numerical simulations allowed the analysis of the breakdown voltage, which was demonstrated to be improved in the GC as compared to conventional SOI transistors in thin silicon layer devices in the whole temperature range under analysis.     

基于RCPC码和分块传输的新型HARQ系统

在研究Ⅱ,Ⅲ型HARQ的基础上,提出了基于RCPC码的新型HARQ,并通过仿真得出不同信噪比下的最佳分块方案,以便使新型HARQ获得最佳性能。新型HARQ是将F个相同的分块穿孔后同时发送;在接收端,解穿孔后相同的分块进行分集合并。新型HARQ具有Ⅱ,Ⅲ型HARQ的优点,当信噪比较低时新型HARQ的通过率和平均重传次数接近于Ⅲ型HARQ;当信噪比较高时新型HARQ的通过率和平均重传次数接近于Ⅱ型HARQ。对Ⅱ,Ⅲ型和新型HARQ的性能进行理论分析和仿真,结果证明本文结论正确。     

罐盖压痕残余厚度测量

激光三角法测量原理可有效应用于三维曲面的非接触精密测量,测量数据的统计处理结果直接关系到测量精度的提高,同时也与测量系统结构、被测物体特性及环境条件等因素有关。从激光三角法的测量机理出发,针对易拉罐罐盖开启口压痕残余厚度测量中影响测量的关键问题进行分析和研究,包括激光光点尺寸、激光散斑、精细结构、被测物体表面的光泽、颜色等,其中前三个问题对测量精度的影响最为突出,通过理论分析和研究,初步给出了计算机仿真和实验结果,探讨了减小或消除测量误差的方法。     

LMS算法收敛步长的精确求解

本文提出了用步长阀值上下限的算术平均值去计算收敛步长的新方法,通过LMS算法失调量的精确分析,寻出了计算步长的公式.计算机模拟结果证实了本文方法及其步长计算公式的准确性.     

基于物联网的智能家居控制系统设计与实现

使用ARM处理器和GPRS技术对智能家居实现远程监控和控制,利用Zigbee无线通信技术及CC2430芯片组成家庭内部的局域网络,通过AT89C51单片机作为各控制器终端的控制核心并采用中断方式来进行对应控制。ARM中央处理器、GPRS模块、Zigbee模块之间采用串口通信方式实现,从而使整个系统结合成一个整体。通过该控制系统,用户可以随时随地的通过物联网或者手机对智能家居进行控制并且接收有关的家居信息。     

螺杆钻具马达线型的优化设计分析

本文通过介绍螺杆钻具马达的基本构造及运行原理,在数值分析的基础上求出离散数值的优化解范围,从而优化设计螺杆钻具马达线型.     

E-business technologies for xRM: Exploring the readiness of public broadcasters

This paper examines the possibilities of enhancing relationship management between public service broadcasters and their stakeholders by harnessing the potential of newest e-business technologies and concepts, such as: social media, digital and interactive TV, and mobile computing. In order to facilitate adoption of relationship management strategy, a framework for leveraging relationship management is proposed. Evaluation was performed within the e-business system of a public broadcaster. This empirical study explored the readiness and expected benefits of relationship management implementation. The research results have indicated that a public broadcaster could achieve a higher level of social responsibility, improve business sustainability, and empower communication and collaboration with all the stakeholders by using emerging technologies for relationship management activities.     

一种快速的DCT域MPEG-2到MPEG-1下采样转码技术

文章提出了一种快速的DCT域MPEG-2到MPEG-1准卷积下呆样算法。在转码过程中。头信忠保持不变，且要求将每四个相邻MPEG-2宏块变为一个下采样MPEG-1宏块：用最大最小距离方法确定下采样宏块的运动向量、用简单多数原则确定下采样宏块类型以及用加全平均方案确定下呆样宏块的量化参数。另外，对下采样视频转码失真来源进行了分析。实验结果表明我们提出的转码方案，在同样条件下与级联像素域转码器（TM5）相比，不仅其计算复杂性减少67．6％、PNSR提高0．1dB，而且具有很小的比特控制错误。     

几种涉密网主机系统保护及审计技术的比较

论文比较详细地阐述了涉密网主机系统所面临的安全隐患,提出了涉密网主机安全防护所要解决的几个技术问题,并就可能实现的技术方法进行了探讨和比较。     

基于时序分析的光刻版清洗机运行效率提升方法

光刻版清洗机是典型的多轴运行类自动化清洗设备,清洗效率的提升是此设备的关键技术之一。介绍了一种基于时序分析的提升该设备运行效率的方法,实验证明此方法通过对控制时序的分析和优化,有效提升了设备的运行效率。