An Image Super-Resolution Reconstruction Method with Single Frame Character Based on Wavelet Neural Network in Internet of Things

Mobile Networks and Applications - The application of the traditional single frame character image super-resolution reconstruction method has some problems, such as noise can not be removed...     

Engineered Elastomer Substrates for Guided Assembly of Complex 3D Mesostructures by Spatially Nonuniform Compressive Buckling

Approaches capable of creating 3D mesostructures in advanced materials (device‐grade semiconductors, electroactive polymers, etc.) are of increasing interest in modern materials research. A versatile set of approaches exploits transformation of planar precursors into 3D architectures through the action of compressive forces associated with release of prestrain in a supporting elastomer substrate. Although a diverse set of 3D structures can be realized in nearly any class of material in this way, all previously reported demonstrations lack the ability to vary the degree of compression imparted to different regions of the 2D precursor, thus constraining the diversity of 3D geometries. This paper presents a set of ideas in materials and mechanics in which elastomeric substrates with engineered distributions of thickness yield desired strain distributions for targeted control over resultant 3D mesostructures geometries. This approach is compatible with a broad range of advanced functional materials from device‐grade semiconductors to commercially available thin films, over length scales from tens of micrometers to several millimeters. A wide range of 3D structures can be produced in this way, some of which have direct relevance to applications in tunable optics and stretchable electronics.     

土壤湿度智能化监控装置设计

针对节水灌溉问题,利用单片机实现智能化自动浇灌装置设计,可实时监测、显示土壤湿度值;并根据作物生长特性需要进行适时、适量灌水,可对土壤湿度进行精确控制,优化作物生长环境,提高产量.     

智能配电网与配电自动化

随着居民的生活质量的进步,居民对电力的要求也在提升,但是国家的传统配电网程度低,构架薄弱,以及配电自动化未能广泛应用,依旧处在初级阶段,不再适用于当今社会,为了满足我国的工业用电、居民用电的要求,许多的电力企业渐渐的把注意力转移到了智能配电网上,这种智能配电网提高了电力系统的整体水平.     

混沌跳频通信的非线性自适应预测对抗

基于混沌跳频码序列构造固有的确定性、非线性等特点,提出了对抗混沌跳频通信的非线性自适应预测对抗的新概念.以Logistic-Kent映射设计的混沌跳频码为例,采用基于Sigmiod函数的Volterre自适应滤波预测器对其进行预测研究.仿真实验结果表明非线性自适应预测器比神经网络预测器具有更高的预测对抗效果.     

SOA功率均衡技术的误码率性能分析

对光交叉连接 (OXC)节点中采用半导体光放大器 (SOA)功率均衡技术的方案性能进行了理论分析。首先模拟计算了链路中引入SOA后的功率代价 ;然后逐一讨论了发射机消光比 ,信号码率 ,SOA的噪声系数对系统性能的影响 ;最后计算了OXC节点级联链路的误码率性能。从而为OXC节点和网络设计提供了理论分析和指导依据。     

双包层光纤放大器研究

双包层光纤放大器输出功率高,可用于密集波分复用系统、光纤CATV系统以及空间光通信系统中。本文采用分段方法,利用光子数平衡原理建立了半数值双包层掺稀土光纤放大器理论模型。利用本模型可以对双包层光纤放大器进行优化设计。     

信息安全在邮政金融网中的实现

随着邮政金融网络化进程的推进,邮政金融系统的安全风险也越来越高,因此如何实现网络信息安全成为保证邮政金融系统正常运行至关重要的因素.文中介绍了实现网络信息安全的有关技术及实现方法,如数据加密、数字签名、防火墙等.通过应用这些安全防范技术,提出相应的网络信息安全方案,使邮政金融信息能够安全地在网络中进行通信.合理的网络安全方案和完善的管理体制是邮政金融网络系统安全运行的必要条件.     

A few CMOS transconductors optimized for low power and wide band operation

Maximizing the bandwidth of operation relative to dc power dissipation in complementary metal oxide semiconductor (CMOS) transconductors has been addressed in this article. It is proposed that the ac transconductance-to-dc power dissipation ratio is an appropriate objective function in this case. The general nature of the objective function is examined first. CMOS transconductors with two and four MOS working transistors are analyzed next. For structures of each kind, the ac transconductance-to-dc power dissipation ratio is maximized, and the optimal set of voltage variables is evaluated. For four-MOS structures with differential input signals, it is revealed that the choice of signal phase influences the objective function. The results of theoretical analyses are exhaustively tabulated. Numerical simulations are used to bring out the significance of the analytical expressions. This facilitates a comparison among several transconductors regarding the best possible ac transconductance-to-dc power dissipation ratio. These results are combined with HSPICE simulation results to suggest a few transconductor structures that are optimum with reference to the operation over wide bandwidths with lower power dissipation, high linearity and low harmonic distortion.The research was supported by grant no. N485 awarded to Dr. R. Raut by the Natural Science and Engineering Research Council (NSERC) of Canada.