基于蚁群算法的防空兵兵力机动线路优化

根据防空兵对机动线路的要求以及战时的安全性特点,得出影响防空兵兵力机动线路选择的因素,引入里程指数的概念,将线路的长度进行修正赋权,给出兵力机动线路的等效线路长度。把这一等效线路长度结合到蚁群算法中,能够较好地模拟现代战场的复杂环境对防空兵兵力机动路线的影响,并能科学、合理地选择路线,为指挥员的决策提供帮助。     

兵力展开问题研究

如何将基地的兵力以最短时间展开到多个阵地中,是运输问题中的一种。为解决此问题对著名的兵力展开问题进行了研究。建立了兵力展开问题的数学模型,此模型是一个混合整数规划模型。提出了一种求解方法,该方法可解决类似的混合整数规划问题。最后给出了一个实例。     

一种新的装备配置优化模型

传统的装备配置优化问题一般采用确定性的数学规划方法解决,难以满足高技术条件下现代战争中需要对大量随机现象和模糊现象进行精确定量分析的实际要求。在分析了高技术条件下装备配置问题一般特性的基础上,根据机会约束规划和模糊机会约束规划的思想,提出了一种新的建立装备配置优化模型的思路和方法,并给出了基于随机模拟的遗传算法的实值算例,算例结果与实际情况基本相符,反映了模型的科学性与实用性。     

基于遗传算法的航向测量误差分析

提出了一种基于遗传算法的高精度航向测量误差分析的方法,测量模型由2台全站仪组成.通过最佳保留策略和带约束条件的遗传算子,保证该算法具有全局搜索能力.分析结果表明,遗传算法的搜索空间仅为整个搜索空间的0.03%,该模型在现有码头条件下航向测量的精度可达到4″,满足对舰船导航设备高精度航向标校的要求.     

多边形障碍环境中避障路径的遗传算法

研究了平面障碍环境中避障的遗传算法,重点介绍了障碍环境的模型构造和用遗传算法求解该模型的方法设计.采用了与已有遗传算法不同的染色体编码方式和不同的遗传算子设计,在初始群体产生时尽量避免了引入无效基因,提高了染色体进化的效率,使得该算法具有很好的寻优能力,实验结果也表明了该算法的有效性.     

The bottleneck problem with minimum quantity commitments

Given an edge‐distance graph of a set of suppliers and clients, the bottleneck problem is to assign each client to a selected supplier minimizing their maximum distance. We introduce minimum quantity commitments to balance workloads of suppliers, provide the best possible approximation algorithm, and study its generalizations and specializations. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2006     

A misclassification cost‐minimizing evolutionary–neural classification approach

Machine learning algorithms that incorporate misclassification costs have recently received considerable attention. In this paper, we use the principles of evolution to develop and test an evolutionary/genetic algorithm (GA)‐based neural approach that incorporates asymmetric Type I and Type II error costs. Using simulated, real‐world medical and financial data sets, we compare the results of the proposed approach with other statistical, mathematical, and machine learning approaches, which include statistical linear discriminant analysis, back‐propagation artificial neural network, integrated cost preference‐based linear mathematical programming‐based minimize squared deviations, linear integrated cost preference‐based GA, decision trees (C 5.0, and CART), and inexpensive classification with expensive tests algorithm. Our results indicate that the proposed approach incorporating asymmetric error costs results in equal or lower holdout sample misclassification cost when compared with the other statistical, mathematical, and machine learning misclassification cost‐minimizing approaches. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2006.     

X波段矩形波导宽边复合缝隙耦合器的MPSTD算法分析

针对MPSTD算法在波导宽边复合缝隙问题中的应用,重点研究了X波段标准波导宽边复合缝隙耦合器的缝隙谐振长度和散射参量特性。仿真结果表明,将MPSTD算法应用于波导耦合缝隙问题的分析,可实现对该问题的精确建模,具有较高的计算精度和效率。     

矩阵外积法Kalman滤波器在动态GPS定位中的应用

由于计算机有效字长的限制,滤波算法在计算机上实施时易于产生误差积累,误差协方差失去正定性或对称性,从而出现数值计算中的不稳定现象.一般情况下,当状态变量维数超过10时,滤波过程中出现滤波结果不稳定现象概率增大.为了解决滤波器数值计算不稳定问题,实践中提出并应用了许多方法,如自适应滤波、固定增益滤波、平方根滤波等.这些算法的不足是计算繁琐,效率低下.提出一个基于矩阵外积法所设计的快速、稳定的滤波算法,该卡尔曼滤波算法速度快,效率高,数值稳定性好,运算量少,将其应用于动态GPS定位验证了其有效性.     

An experiment evaluating how the tiny mass eccentricities in spin-stabilized projectiles affect the position of impact points

This study investigates and quantifies some possible sources affecting the position of impact points of small caliber spin-stabilized projectiles (such as 12.7 mm bullets). A comparative experiment utilizing the control variable method was designed to figure out the influence of tiny eccentric centroids on the projectiles. The study critically analyzes data obtained from characteristic parameter measurements and precision trials. It also combines Sobol's algorithm with an artificial intelligence algorithm—Adaptive Neuro-Fuzzy Inference Systems (ANFIS)—in order to conduct global sensitivity analysis and determine which parameters were most influential. The results indicate that the impact points of projectiles with an entry angle of 0° deflected to the left to that of projectiles with an entry angle of 90°. The difference of the mean coordinates of impact points was about 12.61 cm at a target range of 200 m. Variance analysis indicated that the entry angle — i.e. the initial position of mass eccentricity — had a notable influence. After global sensitivity analysis, the significance of the effect of mass eccentricity was confirmed again and the most influential factors were determined to be the axial moment and transverse moment of inertia (Izz Iyy), the mass of a projectile (m), the distance between nose and center of mass along the symmetry axis for a projectile (Lm), and the eccentric distance of the centroid (Lr). The results imply that the control scheme by means of modifying mass center (moving mass or mass eccentricity) is promising for designing small-caliber spin-stabilized projectiles.