一种改进的动态改变惯性权重的粒子群算法

惯性权重在粒子群算法中起到重要的作用,综合考虑了影响惯性权重的几种因素,提出基于进化速度、聚集度和相似度的动态改变惯性权重的粒子群算法,实验证明改进算法在收敛率、收敛精度和全局寻优能力方面都优于几种有代表性的动态改变惯性权重的算法.     

一种自适应惯性权重的粒子群优化算法

为较好平衡粒子群算法中全局搜索能力与局部搜索能力,分析了PSO算法中的惯性权重与种群规模、粒子适应度以及搜索空间维度的关系,并把粒子惯性权重定义为这三者的函数.通过在每次迭代后更新每个粒子的惯性权重,实现了自适应调整全局搜索能力与局部搜索能力,并结合动态管理种群的策略提出了改进的粒子群算法.通过在多个常用测试函数上与已有惯性权重调整算法测试比较,证明新算法具有较强的全局寻优能力与较高的搜索效率.     

基于粒子群算法的PID控制器参数优化

粒子群算法是一种智能算法,在PID控制器参数整定的应用中可取得更优的效果。为解决传统的粒子群算法早熟收敛和收敛速度慢的缺点,文中采用了一种基于相似度动态调整惯性权重的方法,即越靠近目前最优粒子的个体被赋予越小的惯性权重值。最后用MATLAB对等温连续搅拌釜反应器仿真。与标准的PSO算法整定方法相比,改进的粒子群算法稳定时间为230.1 s,比传统粒子群算法524.7 s的稳定时间缩小了一半,表明改进的算法对PID控制器的参数优化有着较优的收敛效果。     

具有量子行为的粒子群优化算法惯性权重研究及应用

在研究惯性权重对基本PSO算法影响的基础上,根据惯性权重对粒子群算法影响的特点,采用4种惯性权重策略对一种新的具有量子行为的粒子群算法的速度进行调节,比较每种算法的性能,从中找到一种新的性能更好的改进算法,将其用于求解0-1背包问题。实验结果表明较好地选择惯性权重参数对算法的性能有很大提高,该改进算法在求解0-1背包问题中具有高效性,提高了最优解的精度,同时具有较快的收敛速度。     

一种改进惯性权重的粒子群优化算法

针对粒子群算法易陷入局部最优解的问题,提出一种改进惯性权重的粒子群优化算法（CWPSO）。首先引入Sigmoid函数构造自适应的惯性权重策略;然后引入线性递减的惯性权重策略;最后通过群体适应度方差将自适应惯性权重策略和线性递减惯性权重策略动态结合,构造综合惯性权重策略,以提高算法全局搜索和局部搜索的能力。实验结果表明,CWPSO算法的寻优性能相较于对比算法有明显提升。     

自适应粒子群优化算法及其在测试数据生成中的应用研究

针对粒子群算法易陷入局部最优解及搜索精度低的问题,本文提出一种约简的自适应粒子群优化算法并应用于测试数据的自动生成.首先对粒子群进化方程约简,提出无速度项的粒子群进化方程;然后,对约简后的方程提出基于惯性权重的自适应调整方案,将惯性权重直接作用于粒子的位置,并根据粒子的适应度及聚集度将种群划分为三部分.实验表明,该方法可以有效地提高自动生成测试数据的效率.     

基于PSO算法的医疗大数据任务调度策略

在医疗信息共享平台下,选取一种合适的任务调度策略完成医疗数据查询任务在各医院内的调度分配,是医疗大数据处理所需解决的重要问题。为了保证任务调度时间最短和成本最低,提出一种改进的粒子群算法。该算法构造了时间最优和成本最优双适应度函数,自适应地调整粒子速度更新的惯性权重,加快搜寻最优粒子的速度,并求解出最合理的数据查询任务调度方案,最大限度地提高医疗信息共享平台中医疗数据查询的效率。实验结果验证了所提出算法的有效性。     

基于权重最小二乘结构边缘保持色调映射算法

高动态范围图像由于其动态范围超过普通显示器的动态范围,所以无法正常显示,从而需要研究在保留高动态范围图像对比度、细节信息以及色彩信息的情况下压缩高动态范围图像的动态范围以适应低动态范围显示器进行显示的色调映射算法。本文提出基于权重最小二乘结构的边缘保持图像平滑色调映射算法。首先,建立基于权重最小二乘的边缘保持图像平滑滤波算子;然后,将输入的高动态范围图像转换至NTSC空间分离亮度信息和颜色信息,利用该滤波算子对亮度信息进行多级分层,获得基本层以及多级细节层信息;最后,对基本层进行动态范围压缩,利用压缩后的基本层结合多级细节层信息并转换回RGB空间获得输出的低动态范围图像。文中通过实验采集的多曝光图像序列利用Debevec和Malik提出高动态范围图像融合算法获得拍摄场景的高动态范围图像,采用本文提出算法对高动态范围图像进行色调映射处理获得较为理想的保留图像有效信息的低动态范围图像,从而验证了文中提出算法的有效性。     

图像去噪处理中的粒子群优化算法研究

随着科学技术的发展,数字图像处理技术的应用越来越广泛.然而由于图像信息的多样性和复杂性等特征,目前在图像处理领域,建模困难、处理不完整等问题普遍存在.因此,智能优化方法因其易于理解、便于实现等特点在图像处理领域得到了广泛应用.其中,粒子群优化算法己经在图像处理领域应用中取得了一定的成功,但是粒子群算法中的惯性权重分配仍然存在着很多需要改进的地方.本文在研究基本粒子群优化算法的基础上,改进了传统线性惯性权重调整策略,提出两步权重分配方法,并将此改进算法应用于图像去噪问题上.     

一种新的粒子群优化的图像匹配算法

针对粒子群算法在图像匹配中易陷入局部最优、搜索速度慢以及匹配精度不高的问题,提出一种新的粒子群优化的图像匹配算法。首先,以改进的非线性惯性权重对粒子群算法进行优化,以此来平衡粒子在全局和局部的搜索能力;其次,提出添加动态扰动项对速度进行扰动,避免粒子在算法后期速度停滞为零而陷入局部最优。仿真结果表明,该算法提高了粒子的全局搜索能力和收敛精度,有效防止早熟现象,与基于标准的PSO图像匹配算法相比,所提算法具有收敛速度快、鲁棒性好以及匹配精度高的特点。     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.