Advanced Fuzzy C-Means Algorithm Based on Local Density and Distance

This paper presents an advanced fuzzy C-means (FCM) clustering algorithm to overcome the weakness of the traditional FCM algorithm, including the instability of random selecting of initial center and the limitation of the data separation or the size of clusters. The advanced FCM algorithm combines the distance with density and improves the objective function so that the performance of the algorithm can be improved. The experimental results show that the proposed FCM algorithm requires fewer iterations yet provides higher accuracy than the traditional FCM algorithm. The advanced algorithm is applied to the influence of stars’ box-office data, and the classification accuracy of the first class stars achieves 92.625%.     

浅议防洪堤中涵闸渗透破坏及防渗设计

分析了穿堤涵闸的工作特点和破坏现象及其原因 ,提出了穿堤涵闸防渗排水设计要点     

建筑物下大断面隧道施工方案及开挖模拟分析

针对南京地铁鼓楼站--玄武门站停车线段双洞隧道地表有建筑物、两洞小间距且其中一个为大断面隧道的特点,提出了相应的施工工法,并采用二维有限元理论分析,论证了工法的合理性.分析表明,大断面隧道双侧导坑的上台阶、核心土的上台阶及小断面隧道的上台阶等开挖引起的地面沉降量较大.     

Bootstrap法在车辆故障检测中的研究及应用

介绍Bootstrap方法的原理并将Bootstrap方法应用于检测车辆中存在的故障,通过计算不同故障下的车辆样本之间均匀Kullback-Lcible距离的均值以及在给定置信度下的置信区间等特征值来反映被测车辆的故障种类。给出一种新的随机数产生器用在Bcotstrap法重采样中产生新的随机序列。以车辆卜的驱动桥为检测对象对该算法进行了验证,结果表明该算法能准确检测出驱动桥所存在的故障。     

海流对潜布水雷水中弹道的影响研究

针对某型水雷的水中弹道问题,分析了某型潜布沉底水雷的水下无动力运动过程中的受力情况,在分析海流对其作用力的基础上,建立了研究其水下散布的水下无动力运动的六自由度空间弹道数学模型和海流影响分析模型,并用Matlab软件编写了潜射水雷水下散布仿真程序,并对不同流速条件下的水雷散布进行了研究,给出了仿真结果和分析结论。     

水下潜器改进S面控制及控制系统仿真(英文)

S surface controllers have been proven to provide effective motion control for an autonomous underwater vehicle (AUV). However, it is difficult to adjust their control parameters manually. Choosing the optimum parameters for the controller of a particular AUV is a significant challenge. To automate the process, a modified particle swarm optimization (MPSO) algorithm was proposed. It was based on immune theory, and used a nonlinear regression strategy for inertia weight to optimize AUV control parameters. A semi-physical simulation system for the AUV was developed as a platform to verify the proposed control method, and its structure was considered. The simulation results indicated that the semi-physical simulation platform was helpful, the optimization algorithm has good local and global searching abilities, and the method can be reliably used for an AUV.     

越人——我国古代天生的航海家

<正>公元2500年前的一天,中国大陆东南沿海一隅,一支由楼船、戈船、扁舟、轻舟等混编而成的船队正待启航,或者是一次征服,或者是一次移民,或者仅仅是一次巡游。风和日丽,波澜不兴,但船员们知道看似平静的水域蕴藏着怎样的凶险,不过从他们脸上看不到畏惧,更不会退缩,无数次惊涛骇浪中的体验早已化为一种从容。     

浅谈保修厂厂长工作要点

公交企业的保修厂作为一个独立的工作系统,承担着运营车辆的维修、保养任务,工作头绪多且涉及面宽.保修厂厂长如何做好管理工作,本人结合自己的认识和经验总结工作要点如下,供参考.     

An integrated GPS/DR navigation system for AUV

GPS/Dead-reckoning navigation system for autonomous underwater vehicle （AUV） is introduced, which includes navigation overall architecture, hardware and software structure. Dead-reckoning theory is presented in details. And the strong tracking Kalman filter and Singer model are applied to handle the imprecise navigation mode, which can improve the navigation system＇s precision and reliability. Finally, the sea experiments which include autonomous search mission in an unknown area and long distance motion are conducted to demonstrate the reliability and feasibility of the navigation system.