一种新的覆盖粗糙集及其模糊性度量

在覆盖近似空间中定义了一类新的模糊集,给出了该类模糊集的模糊性度量,讨论模糊集及其模糊度量的性质,最后通过实例给出直观解释.     

一种提高Vicsek模型收敛效率的新方法

针对Vicsek模型收敛速度较慢和一致程度较低的问题,利用动态网络的拓扑结构并结合复杂网络中度的概念,提出一种以度为权重提高Viesek模型收敛效率的新方法.进一步以动态网络的度的幂指数得到模型的推广形式,该指数的范围为[0,∞).仿真实验结果表明,改进后模型的收敛效率优于原模型,且收敛效率随着指数的增加而增大.     

战斗机空气循环系统故障诊断方法的仿真研究

现代战斗机的飞行包线范围较大,飞行条件严苛多变,机载电子设备的功率密度也在不断增加,为了保证飞行员安全舒适,保障电子设备可靠工作,空气循环系统的可靠性问题亟待解决.为此提出了一种战斗机空气循环系统的故障诊断方法,方法基于BP神经网络.首先,对空气循环系统进行故障分析,选取热交换器和涡轮为典型故障部件,以二者的效率为故障特征值.其次,对空气循环系统的四种典型故障模式进行仿真,由仿真得到的数据训练BP神经网络,实现故障模式识别.诊断结果表明,方法具有良好的准确性和自适应性,能够成功诊断空气循环系统的典型故障.针对战斗机空气循环系统提出的故障诊断方法合理,对系统的可靠性研究具有重要意义.     

基于免疫和模糊模式识别的检测器生成模型

分析了在检测器生成过程中引入模糊模式识别的原因,提出了一种基于免疫原理和模糊模式识别的检测器生成模型,该模型的核心算法是基于隶属度的检测器选择算法.详细描述了该算法的算法流程和检测器对非我抗原集合隶属度的计算算法,并简述了初始检测器生成算法和分层检测策略.设计了仿真试验,并将实验结果同传统方法进行了比较,详述了仿真实验中各个参数选择的依据和理由,试验结果表明新模型呈现较高的检测率和低的误检率.     

Study on Recognition Method of Similar Weather Scenes in Terminal Area

Weather is a key factor affecting the control of air traffic. Accurate recognition and classification of similar weather scenes in the terminal area is helpful for rapid decision-making in air traffic flow management. Current researches mostly use traditional machine learning methods to extract features of weather scenes, and clustering algorithms to divide similar scenes. Inspired by the excellent performance of deep learning in image recognition, this paper proposes a terminal area similar weather scene classification method based on improved deep convolution embedded clustering (IDCEC), which uses the combination of the encoding layer and the decoding layer to reduce the dimensionality of the weather image, retaining useful information to the greatest extent, and then uses the combination of the pre-trained encoding layer and the clustering layer to train the clustering model of the similar scenes in the terminal area. Finally, terminal area of Guangzhou Airport is selected as the research object, the method proposed in this article is used to classify historical weather data in similar scenes, and the performance is compared with other state-of-the-art methods. The experimental results show that the proposed IDCEC method can identify similar scenes more accurately based on the spatial distribution characteristics and severity of weather; at the same time, compared with the actual flight volume in the Guangzhou terminal area, IDCEC's recognition results of similar weather scenes are consistent with the recognition of experts in the field.     

控制策略对机载雷达永磁电机峰值转矩影响分析

针对机载雷达用永磁电机对功率密度的苛刻要求与短时高过载和长时低负载转矩的工况特点,在分析表贴式永磁电机和内嵌式一字形、V字形永磁电机的气隙磁密特点基础上,对比研究了直轴电流为零控制策略和最大转矩电流比控制策略对电机输出峰值转矩的影响。研究结果表明,采用直轴电流为零控制策略,表贴式永磁电机具有更大的峰值转矩;采用最大转矩电流比控制策略,内嵌式V字形永磁电机具有更大的峰值转矩;三种类型电机,相同机载雷达应用工况下,内嵌式V字形永磁电机温升最低。     

Air pollution modelling using a Graphics Processing Unit with CUDA

The Graphics Processing Unit (GPU) is a powerful tool for parallel computing. In the past years the performance and capabilities of GPUs have increased, and the Compute Unified Device Architecture (CUDA) - a parallel computing architecture - has been developed by NVIDIA to utilize this performance in general purpose computations. Here we show for the first time a possible application of GPU for environmental studies serving as a basement for decision making strategies. A stochastic Lagrangian particle model has been developed on CUDA to estimate the transport and the transformation of the radionuclides from a single point source during an accidental release. Our results show that parallel implementation achieves typical acceleration values in the order of 80-120 times compared to CPU using a single-threaded implementation on a 2.33 GHz desktop computer. Only very small differences have been found between the results obtained from GPU and CPU simulations, which are comparable with the effect of stochastic transport phenomena in atmosphere. The relatively high speedup with no additional costs to maintain this parallel architecture could result in a wide usage of GPU for diversified environmental applications in the near future.     

基于远程冰蓄冷空调机房的自动控制设计

为了解决"电力告急,电量有余的状态",争取将用电低谷时期电力填补到高峰时的电力不足。而"移峰填谷"式的蓄冰空调逐渐成为中央空调发展的一个趋势。实现冰蓄冷机房的控制是用WebAccess组态软件完成设定、监控和故障报警等,对冰蓄冷机房进行各种水温、水压、流量和空气温度、湿度、风量、压力、风阀开度等参数进行监控,并且通过通讯实现预测空调负荷从而确定系统工作模式、改变控制策略,这样可提高冰蓄冷空调的运行水平。     

OCI9数据库访问接口的改进

大型空中交通管制系统中会因频繁连接数据库而导致系统性能下降。为解决上述问题,利用连接池技术对OCI9数据库访问接口进行改进,减小数据库连接对象频繁的创建和销毁带来的系统开销,提高系统性能。通过实验证明了该方法的有效性,并成功发现Oracle InstantClient Version 10.2.0.5的一个堆栈溢出错误。     

基于检测代理的应用级双机管理系统

分析现有空管系统中主从双机管理子系统的特点及不足,提出一种基于检测代理的应用级双机管理系统设计方法。系统模型以服务、应用进程和资源为单位进行实时检测和管理,从而实现负载均衡的功能。实验结果证明,该方法能够有效提高系统运行的稳定性和可靠性。