引导扰码的研究

本文对引导扰码进行了更深入的研究，不仅证明了在满足一定条件下引导扰码可产生类似于白噪声的输出特性，而且还建立了硬件和软件二套技术方案并实验成功，经测试检验，证明完全可行。     

基于线结构光的盾尾间隙测量方法研究

针对现有盾构施工中盾尾间隙难以实时精确测量的问题,本文提出了一种基于线结构光的盾尾间隙自动测量方法。该方法首先利用线激光器在管片和盾壳之间投射出一道窄线型指示激光并通过工业相机实时采集线激光器投射在盾壳和管片之间的线激光图像,然后通过图像处理对图像目标特征进行识别并根据单目视觉成像原理和线结构光坐标测量算法提取盾尾间隙端点坐标,进而实现盾尾间隙值的精确解算。实验结果表明,本文所提出方法的重复性测量精度优于0.3 mm,绝对测量精度优于1.7 mm。该方法可以实现相机纵深方向0.2～1.9 m范围内盾尾间隙的实时精确测量,满足城市地铁隧道施工应用需求。     

利用RTS噪声确定MOSFET氧化层中陷阱位置的方法

强场诱生并与电场奇异性相关的边界陷阱是影响深亚微米MOS器件可靠性的关键因素之一.文中研究了深亚微米MOS器件的随机电报信号(RTS)的时间特性,提出了一种通过正反向测量器件非饱和区噪声的手段来确定边界陷阱空间分布的新方法.对0.18μm×0.15μm nMOS器件的测量结果表明,利用该方法可以准确计算深亚微米器件氧化层陷阱的二维位置,还为深亚微米器件的可靠性评估提供了一种新的手段.     

用最小二乘法恢复逐行倒相副载波

介绍ＰＡＬ制彩色全电视信号中色同步信号编码原理及恢复逐行倒相副载波的过程中，两种计算色同步信号相位角的方法。并且在实验的基础上得出：最小二乘法在ＰＡＬ制电视信号的副载波相位角计算中不仅可以满足精度要求，而且简便灵活。     

Capacity Analysis for Connection Admission Control in Indoor Multimedia CDMA Wireless Communications

In this paper, the capacity analysis for connection admission control is presented for the reverse-link transmission of a packetized indoor multimedia wireless communication system using direct sequence code division multiple access (DS/CDMA). Since CDMA is interference limited, the signal-to-interference-plus-noise ratio criterion is used to check if there is enough system resources (i.e., the CDMA channels and received signal power) for each new connection request. Taking into account the stochastical nature of multimedia traffic, the effective bit rate is used to characterize the resources required by each mobile user and a linear approximation is then used to find the total resources required by all the mobile users already admitted to the system and the new connection request. Transmission errors due to both base station buffer overflow and wireless channel impairments are considered. The capacity of multimedia traffic is determined in such a way that the utilization of the system resources is maximized and, at the same time, the required transmission bit error rate and transmission delay of all users admitted to the system are guaranteed. Computer simulation results are given to demonstrate the performance of the proposed method for capacity analysis.     

Non-Fragile H_{\infty } Filter Design for Uncertain Stochastic Nonlinear Time-Delay Markovian Jump Systems

This paper investigates the problem of non-fragile and mode-dependent \(H_{\infty }\) filter design for a class of nonlinear stochastic Markovian jump systems with mode-dependent time-varying delays and norm-bounded parameter uncertainties. The non-fragile and mode-dependent filter to be designed is assumed to include multiplicative gain variations which result from inaccuracies in filter implementation, and the desired filter ensures the filtering error system is not only exponentially mean-square stable, but also satisfies a prescribed \(H_{\infty }\) -norm level for all admissible uncertainties. A stochastic Lyapunov–Krasovskii function is proposed to reflect the information of Markovian jump modes and the mode-dependent time-varying delays, and a set of strict linear matrix inequalities are utilized to derive sufficient conditions that guarantee the desired filter can be constructed. A numerical example and a vertical take-off and landing (VTOL) helicopter system are utilized to illustrate the effectiveness and usefulness of the main results obtained.     

光电耦合器电流传输比的噪声表征

光电耦合器中可俘获载流子的陷阱密度是影响其电流传输比(CTR)的重要因素,并与器件可靠性有密切关系.在器件内部的多种噪声中,1/f噪声可有效地表征器件陷阱密度.本文在研究光电耦合器工作原理以及1/f噪声理论的基础上,建立了光电耦合器的CTR表征模型和1/f噪声模型.在输入电流宽范围变化的条件下,测量了器件的电学噪声和CTR变化,实验结果验证了以上模型的正确性.将CTR模型与噪声模型相结合,得到了CTR与1/f噪声之间的关系.此关系应用于对光电耦合器辐照实验结果的分析,实验结果与理论得到的结论一致.理论与实验结果表明,噪声幅值越大,电流指数越接近于2,则器件的可靠性越差,相同工作条件下CTR的老化衰减量越大,其失效率显著增大.从而证明噪声可表征光电耦合器的CTR并能准确地反映器件的可靠性.     

面向AVS视频解码器的优化方法研究

针对AVS视频解码器开源代码效率相对低下的问题,文章从算法（Algorithm）、代码（Code）、平台（P1atform）方面考虑,提出了一套AVS解码器优化方法（简称AcP方法。在AVS工作组参考解码器上对所提出的ACP方法的有效性进行了验证,实验结果表明,经过ACP方法优化后的AVS软件解码器的解码速度有明显提高,满足了标清格式720P视频实时解码的要求。     

Iron Oxyhydroxide: Structure and Applications in Electrocatalytic Oxygen Evolution Reaction

Oxygen evolution reaction (OER) is the anodic half-reaction for crucial energy devices, such as water electrolysis, metal–air battery, and electrochemical CO₂ reduction. Fe-based materials are recognized as one of the most promising electrocatalysts for OER because of its extremely low price and high activity. In particular, iron oxyhydroxide (FeOOH) is not only highly active toward OER, but also widely accepted as the true active species of Fe-based OER electrocatalysts for plenty of Fe-based materials are converted into FeOOH during OER test. Herein, the recent advances of FeOOH-based nano-structure and its application in OER are reviewed. The relationship between FeOOH structure and its catalytic performance, followed by the introduction of current strategies for enhancing the OER activity (i.e., crystalline phase engineering, element doping, and construction of hybrid materials) is mainly focused. Finally, a summary and perspective about the remaining challenges and future opportunities in this area and further the design of Fe-based OER electrocatalysts are provided.