注水电机断路器信号灯闪光故障分析

概述油田联合站内注水电机断路器信号灯闪光的原因．并分析联合站注水电机和变电站内的电力设备之间的联系及联合站开始施工时遗留的一些工程隐患导致的故障,提出改进措施,指出在运行过程中应注意的问题。     

改进蝙蝠算法优化极限学习机的图像分类

针对分类器中的极限学习机参数优化问题,本文提出一种改进蝙蝠算法优化极限学习机的图像分类模型。首先将极限学习机参数看作蝙蝠位置,然后采用改进蝙蝠算法进行求解。采用病毒群体感染主群体,主群体在历代个体间纵向传递信息,病毒群体通过感染操作在同代个体间横向传递信息,增强了算法跳出局部极小值的能力。最后根据最优参数建立图像分类模型,并对模型的性能进行仿真测试。仿真结果表明,相对于对比模型,本文模型不仅提高了图像分类正确率,而且加快了分类速度,是一种有效的图像分类模型。     

机器学习理论在入侵检测技术中的应用研究

入侵检测系统是主动保障网络信息安全的重要方法。本文针对大规模、高带宽网络环境下,入侵检测技术存在的不足,提出将机器学习理论应用到入侵检测系统中。文章简要介绍几种适合用于入侵检测系统中的机器学习算法,并建立基于机器学习理论的入侵检测系统框架。利用机器学习的算法不仅能检测到一些已知的攻击,还可以通过自我学习检测到未知的攻击。     

浅谈PLC技术对机床电路的改造

本文首先对传统机床电路的缺陷进行了简要介绍,并对PLC技术对机床电路的改造方法和流程进行了分析,最后对改造过程中的注意事项展开了探讨,希望对我国相关领域的发展起到促进作用.     

改进的kNN分类算法在工业物联网中的应用

在工业物联网中,k近邻分类(kNN)被广泛应用于缺陷产品识别和异常检测.但kNN自身存在计算复杂度高、不适用于分布式环境等缺点.因此,文中提出了一种安全有效的分布式kNN分类算法,以防止信息泄漏和控制流泄漏,同时支持分布式服务器上的大规模数据分类.首先设计了一个安全有效的向量同态加密方案.在该方案的基础上,提出了DkN...     

Modern development methods and tools for embedded reconfigurable systems: A survey

Heterogeneous reconfigurable systems provide drastically higher performance and lower power consumption than traditional CPU-centric systems. Moreover, they do it at much lower costs and shorter times to market than non-reconfigurable hardware solutions. They also provide the flexibility that is often required for the engineering of modern robust and adaptive systems. Due to their heterogeneity, flexibility and potential for highly optimized application-specific instantiation, reconfigurable systems are adequate for a very broad class of applications across different industry sectors. What prevents the reconfigurable system paradigm from a broad proliferation is the lack of adequate development methodologies and electronics design tools for this kind of systems. The ideal would be a seamless compilation of a high-level computation process specification into an optimized mixture of machine code executed on traditional CPU-centric processors and on the application-specific decentralized parallel data-flow-dominated reconfigurable processors and hardware accelerators. Although much research and development in this direction was recently performed, the adequate methodologies and tools necessary to implement this compilation process as an effective and efficient hardware/software co-synthesis flow are unfortunately not yet in place. This paper focuses on the recent developments and development trends in the design methods and synthesis tools for reconfigurable systems. Reconfigurable system synthesis performs two basic tasks: system structure construction and application process mapping on the structure. It is thus more complex than standard (multi-)processor-based system synthesis for software-programmable systems that only involves application mapping. The system structure construction may involve the macro-architecture synthesis, the micro-architecture synthesis, and the actual hardware synthesis. Also, the application process mapping can be more complicated and dynamic in reconfigurable systems. This paper reviews the recent methods and tools for the macro- and micro-architecture synthesis, and for the application mapping of reconfigurable systems. It puts much attention to the relevant and currently hot topic of (re-)configurable application-specific instruction set processors (ASIP) synthesis, and specifically, ASIP instruction set extension. It also discusses the methods and tools for reconfigurable systems involving CPU-centric processors collaborating with reconfigurable hardware sub-systems, for which the main problem is to decide which computation processes should be implemented in software and which in hardware, but the hardware/software partitioning has to account for the hardware sharing by different computation processes and for the reconfiguration processes. The reconfigurable system area is a very promising, but quite a new field, with many open research and development topics. The paper reviews some of the future trends in the reconfigurable system development methods and tools. Finally, the discussion of the paper is summarized and concluded.     

Design, modeling and control of a hybrid machine system

A hybrid machine is such a machine where its drive system integrates two types of motors: the servomotor and the constant velocity (CV) motor. The existing research on the hybrid machine prototypes usually uses two servomotors, of which one “mimic” the CV motor by prescribing a constant velocity trajectory profile. It is obvious that this departs away from the real situation where a CV motor is in place. The CV motor will bring in the velocity fluctuation which can not be attenuated by the CV motor itself due to the lack of a control mechanism in the CV motor, yet be propagated to the servomotor, and further to the end-effector of the machine. The general strategy for controlling the hybrid machine is therefore to model this propagated fluctuation and incorporate it into a controller for the servomotor. A controller based on the sliding mode control technique is proposed for the hybrid machine in this paper. The stability analysis shows that the controller is asymptotically stable. Simulation with a preliminary test demonstrates the effectiveness and robustness of this controller. Finally, we examine further performance improvement through attaching a flywheel on the CV motor to demonstrate the effectiveness of the synergy of the integration of mechanical and electrical means.     

红外成像设备内场测试系统设计

针对红外场景生成技术发展现状,采用红外场景生成器模拟产生真实红外图像的技术,设计了对红外成像设备进行性能指标验证的内场测试系统,分析了系统组成及工作原理,采用MultiGen Creator作为建模工具设计虚拟环境模拟单元并给出工作流程,通过对红外场景生成器技术水平和应用情况分析,确定了DMD数字微反射镜阵列体制的红外场景生成器。     

基于DSG的传输网综合管理系统研究与实现

在对传输网络管理的现状和存在的难点问题进行深入研究的基础上,基于先进的网管开发平台DSG,提出了传输网综合管理系统的实现方案,系统的实现解决了接口协议不同、系统升级、系统定制和系统扩展等网管建设中存在的难点问题.