EMC defines the ability of an electrical or electronic device to function satisfactorily in its electromagnetic environment without introducing unbearable electromagnetic disturbances to other devices in the same environment.

Smartwatches are computerized watches that are designed with enhanced functionalities such as making calls, messaging, and browsing the internet. Smartwatches are integrated with an operating system that can be used across multiple devices. In the past couple of years, the Global Smartwatches market has been undergoing rapid changes in technology, where ongoing innovations have been taking place with vendors coming up with various new features for smartwatches. For example, hands-free, voice command-enabled smartwatches were introduced in the market by Motorola. Such advances in technology have increased the applications of smartwatches. Though the market did not grow as expected during 2010-2013, the market landscape is expected to change drastically by 2015, presenting high growth.

Electrical enclosures are used to protect equipment such as power generators, transmitters, power distributors, and other electrical equipment. They are of two types: metallic and non-metallic. Power generators, transmitters, and power distributors use enclosures as a cabinet to mount switches, displays, and knobs. Enclosures help protect equipment users from electric shock and protect the equipment from various environmental conditions.

Industrial robotics is the study, development, and use of robots in the manufacturing process. Automatically controlled, multipurpose industrial robots have application mainly in manufacturing industries, such as food and beverage, electronics, and automotive. Industrial robotic systems are classified based on technical parameters, such as the number of axes, degree of freedom, working envelope, kinematics, payload, acceleration, accuracy, and repeatability. These systems are programmed to control and automate various functions involved in manufacturing processes, such as welding, painting, assembly, product inspection，testing, and packaging.

本文提出了一种基于多字典稀疏表示的亚像元映射算法,利用已知的同类型高空间分辨率地物分布图像,构建能够更好反映不同类别地物空间分布模式的多个字典,将待分类亚像元用每一类字典稀疏表示,并依据重构误差最小化原则以及光谱失真程度约束条件来划分亚像元的地物类别.模拟与真实数据上的实验结果表明,本文算法能有效应对地物空间分布模式的多样性,具有更高的亚像元映射精度和更好的算法鲁棒性.

本文研究分布式MIMO(Multiple-Input Multiple-Output)系统圆形小区基站侧天线端口的位置优化问题.论文首先建立了包含小尺度Nakagami衰落、阴影衰落和路径损耗的复合衰落信道模型,然后在收发端皆配置多根天线、移动台于小区内具任意概率分布、发射和接收端分别实施选择性传输和最大比合并方案下,在高信噪比条件下推导出圆形小区下行平均遍历容量的近似闭型表达式;随后通过对小区进行相应的区域预划分,采用粒子群算法而非传统遗传算法以快速搜索当前区域内天线端口的最佳位置,并最终根据小区天线端口位置的整体搜索结果确定天线优化布局.仿真结果表明,本文所推导的平均遍历容量近似表达式能较好地反映分布式MIMO系统性能,且所采用的基于粒子群算法的小区最优天线端口位置搜索结果也能较好地接近理论最佳位置.

针对有源相控阵天线的雷达散射截面(Radar Cross Section,RCS)计算复杂、缩减困难,以及RCS与辐射性能难以兼顾问题,基于阵面结构变形与安装引起的辐射单元位置偏移分析,利用辐射单元相位误差,建立了有源相控阵天线阵列散射因子RCS的机电耦合模型.并基于该耦合模型,应用粒子群优化算法,优化阵面所有辐射单元的安装高度,以实现有源相控阵天线辐射性能和散射性能的全优.仿真结果表明,所建立的耦合模型及综合优化方法能够在保证有源相控阵天线辐射性能的条件下,有效缩减其RCS,具有重要的工程应用价值.

外辐射源雷达模糊函数副峰可能会导致检测虚警及弱小目标遮蔽.为抑制模糊函数副峰,提出了一种基于广义旁瓣对消结构的接收机滤波器设计方法,得到了广义旁瓣对消滤波器的闭式解,定量分析了该方法的信噪比损失,指出了副峰高度等因素与信噪比损失的关系.为避开滤波器设计中的高维矩阵求逆运算,提出了快速实现方法.理论分析及基于实测数据的数值计算结果表明,算法能将模糊函数副峰抑制到任意高度,且具有最小的信噪比损失.

A wireless sensor network (WSN) is categorized as three-dimensional (3D) when variation in the height of deployed sensor nodes is not negligible as compared to length and breadth of deployment field. The fundamental problem in such 3D networks is to find an optimal way to deploy sensor nodes needed to maintain full (or targeted degree of) coverage of monitored volume and reliable connectivity as desired by network designers. The solution should yield lower bound on number of nodes needed to achieve full coverage and connectivity. However, optimizing coverage and connectivity in 3D WSNs comes with its inherent complexities and intrinsic design challenges. 3D WSNs are not only difficult to visualize but their analysis is also computationally intensive. This literature summarizes major work conducted in the domain of coverage and connectivity in 3D WSNs. It studies different placement strategies, fundamental characteristics, modeling schemes, analytical methods, limiting factors, and practical constraints dealing with coverage and connectivity in 3D WSNs.

Digital communication is the foundation of modern telecommunications. Basically, it is, an evolution of analog communication that explores the advantages of the information in a digital format. For this reason, differently from analog communication systems, digital systems have to identify, at the receiver, only a finite number of possible transmit waveforms from the received signal and, consequently, they are much more powerful than any analog system.