Application of Finite Difference Method to the Analysis of HTTR Reactor Cavity Natural Convection

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Design and implementation of ethernet passive electronic network over coax

To increase the limit of ethernet over coax （EoC） technology in the bidirectional reform of the hybrid fiber coaxial （HFC） network, an ethernet passive electronic network （EPEN） system based on Coax is proposed and experimentally demonstrated in this paper. The proposed EPEN exploits the existing capabilities of the MAC layer in the ethernet passive optical network （EPON） for reduction of cost of the HFC network. As the MPCP （multi-point control protocol） is introduced in the EPEN, bandwidth control and higher efficiency can be achieved. The experimental results exhibit the throughput of system up to 100Mbps, which meet the requirements of HFC network. To improve the performance of EPEN, frequency division multiplexing （FDM） can be used for further increase of the throughput and more hardware processing modules in the future. can be implemented to enhance the capacity     

Removal of jamming using independent component analysis in non-cooperative passive detection system

Due to electronic jamming transmitted by hostile electronic jamming equipments and unintentional jamming from other illuminating sources in the complex electromagnetic environment,the performance of non-cooperative passive detection systems may degrade it significantly.To solve the problem,a receiving frame with multiple channels for signal preprocessing is designed and a theoretical analysis to the received signals in the complex electromagnetic environment is provided.Furthermore,a scheme for jamming removal using independent component analysis is proposed.Simulation results demonstrate the proposed scheme appears as a very appealing solution for removal of jamming and an approximate 10 dB signal to distortion ratio over traditional schemes is obtained.     

科技英语中的被动句

在科技英语里 ,被动句被广泛采用。在这篇文章里 ,作者详细谈到了如何将科技英语的被动句译成汉语 ,以及在进行汉语科技文章的英译时 ,如何采用被动句 ,使之更符合英语的表达习惯     

职业学校应强化积极校园文化的育人功能

目前教育理论界所研究的校园文化，主要是积极的校园文化，而对于消极的校园文化则很少有人去关注和研究。消极校园文化的存在是客观的，其负面影响也是巨大的。需要按照科学发展观的要求，化消极因素为积极因素，进一步强化积极校园文化的育人功能，以培养合格的社会主义事业建设者和接班人。     

一个沉浸式卸载模拟器的研究与实现

桥式抓斗卸船机被广泛应用于矿石、煤炭等货船的卸载中,通过控制抓斗的三维运动和开闭,从货舱内抓取散货卸载到码头.为了实现对卸船机作业的真实模拟,采用物理建模和机构建模方法,对抓斗运动、动态挖掘、绳索松弛、多通道立体视景、音效、操作控制接口等一系列技术问题进行了研究,实现了沉浸式的桥式抓斗卸船机训练模拟器.     

下一代无源光网络标准浅析

分析并对比了现存的EPON和GPON，以及下一代10G-EPON和XG-PON在物理层的标准和共存的原因，指出了由于需要下一代网络对于现有网络的兼容性导致的成本问题和对于器件的要求。     

基于射频识别的室内定位系统算法研究

针对无源射频识别(Radio Frequency Identification,RFID)定位问题,在对比分析基于信号到达角(Angle Of Arrival,AOA)和信号到达时间差(Time Difference Of Arrival,TDOA)2种定位算法的原理和优缺点的基础上提出了无源超高频(Ultra High Frequency,UHF)RFID室内定位混合方法,该方法以AOA定位算法为核心,融入了 TDOA算法时间差的思想,并使用步进电机代替天线阵列,以一定的角速度带着UHF RFID阅读器绕轴旋转扫描标签以估算待定位标签的位置.仿真结果表明:该室内定位混合方法的精度优于以上任何一种单独的定位算法,是一种更加有效、定位更加精确的技术手段.     

融合AD与Census变换的动态规划立体匹配与遮挡处理

针对传统动态规划立体匹配算法具有速度快的优点,但常伴随条纹现象的问题,设计了一种AD(absolute difference)与Census变换相融合的相似性测度算法,结合新的线性平滑项和动态变搜索半径的方法有效避免了上述问题,提高了匹配的速度和准确性.遮挡现象在双目视觉中难以避免,针对这一难题,采用左右一致性的遮挡检测算法对遮挡区域进行遮挡检测,设计了一种基于颜色和距离相似性的视差优化插值算法,改善了遮挡区域的视差估计.实验结果表明,该立体匹配算法能够快速、准确地估计出视差值,满足立体重构的需要.