A Lyapunov‐based small‐gain approach on design of triggering conditions in event‐triggered control systems

This paper studies a Lyapunov‐based small‐gain approach on design of triggering conditions in event‐triggered control systems. The event‐triggered control closed‐loop system is formulated as a hybrid system model. Firstly, by viewing the event‐triggered control closed‐loop system as a feedback connection of two smaller hybrid subsystems, the Lyapunov‐based small‐gain theorems for hybrid systems are applied to design triggering conditions. Then, a new class of triggering condition, the safe, adjustable‐type triggering condition, is proposed to tune the parameters of triggering conditions by practical regulations. This is conducive to break the restriction of the conservation of theoretical results and improve the practicability of event‐triggered control strategy. Finally, a numerical example is given to illustrate the efficiency and the feasibility of the proposed results. Copyright © 2015 John Wiley & Sons, Ltd.     

Controller design and analysis for singularly perturbed switched systems with actuator saturation

This paper investigates the problems of controller design and stability analysis for singularly perturbed switched systems subject to actuator saturation. A set of well‐defined sufficient conditions for the existence of state feedback controllers is proposed, under which the closed‐loop system is locally asymptotically stable for arbitrary switching law as long as the singular perturbation parameter is sufficiently small. With the obtained controller, the estimation problem of stability bound and basin of attraction of the closed‐loop system is reduced to solving a convex optimization problem. A numerical example and a hydraulic servo position system are used to illustrate the obtained results. Copyright © 2016 John Wiley & Sons, Ltd.     

固定式减摇鳍执行机构的模态及动态响应分析

采用有限元法对小型高速船使用的固定式减摇鳍执行机构进行模态分析和瞬态动力响应分析,对减摇鳍执行机构的结构动力性能进行全面分析.结果可为同类减摇鳍执行机构的结构设计提供参考.     

基于组态软件的水电站监控系统的设计与开发

针对小型水电站集中控制与安全可靠性能的需要,设计了水电站上位机软件,包括监控软件和通讯服务软件两个部分;监控软件采用组态软件IFIX4.5设计,根据监控软件的设计步骤,配置驱动程序实现采集数据、构建过程数据库并对相应参数进行设置、设计监控系统界面、利用IFIX自带的子例程函数库设计报表;通讯服务软件采用VB设计,通过协议转换实现监控软件与智能设备之间的通讯;该上位机软件在实际工程中得到了很好的应用,能够准确实时地显示各机组运行情况及主要运行参数,提高了整个系统的安全可靠性.     

复杂背景下弱小目标的检测*

复杂背景下低信噪比弱小目标的检测是当今目标捡测的一个热点课题。为了检测到弱小目标,首先对图像进行复杂背景抑制,以达到抑制背景、提高信噪比的目的,然后比较三种方法的背景抑制能力,最后对抑制效果好的图像进行图像分割来进行弱小目标检测。     

对中小商业银行等级保护咨询服务探讨与研究

本文力求全面剖析中小商业银行的等级保护咨询服务项目,帮助将要开展信息安全等级保护的咨询方和银行信息安全管理者明确等级保护的咨询服务所涵盖的内容及所能达到的目标。     

Role Negotiation and Interaction: An Exploratory Case Study of the Impact of Management Consultants on ERP System Implementation in SMEs in Taiwan

Abstract

With growing pressures for collaborative information systems (IS) partnerships, Enterprise Resource Planning (ERP) implementation has been an important activity for improving supply chains efficiency in Small and Medium-Sized Enterprises (SMEs). Historically ERP consultants usually take a product-selling approach in SMEs, providing limited management consultancy services. However, a more constructive role for management consultants has become an emerging and challenging issue. This study explored the involvement of management consultants in ERP implementation, particularly with internal managers, ERP consultants and other project members. Extensive interviews were conducted with management consultants as well as 47 project members from four different SMEs in Taiwan employing ERP consultants. Using a grounded theory methodology, prior literature was used to sensitize the findings to key concepts of importance. The results were then analyzed and we described how owner-managers regard management consultants and how the consultants use role negotiation skills to work with both internal managers and ERP consultants. The study found resistance toward management consultants primarily from managers in SMEs, and not owner-managers. The relationships between management consultants and SME managers also differed from similar relationships in large organizations. Suggestions are also provided for academics and practitioners along with areas for future research to extend these exploratory findings.     

基于蓝牙的手机病毒传播模型

随着手机的普及,手机病毒成为用户最关心的手机安全问题。针对手机病毒传播的特点,研究了预防和控制手机病毒传播的策略,为防止病毒传播提供一定的理论依据;运用动力学方法对基于蓝牙网络的手机病毒传播进行定性分析,建立了能反映病毒传播的数学模型;通过分析阐明了用户的安全意识和行为习惯以及已感染手机的移动率等是影响病毒传播的关键因素。     

The upper and lower bounds of the information-hiding capacity of digital images

The information-hiding capacity of a digital image is the maximum information that can be hidden in that image, while the lower limit of information hiding is the minimum detectable information capacity. This paper proposes a new method of information-hiding capacity bounds analysis that is based on the neural network theories of attractors and attraction basins. With this method, the processes for determining upper and lower limits of information hiding, are unified within a single theoretical framework. Results of research show that the theory of attraction basins of neural networks can be used to determine the upper limit of information hiding and the theory of attractors of neural networks can be used to determine the lower limit of information hiding.     

小城镇综合地理信息系统的设计与开发

针对小城镇管理的现状和发展需求,结合小城镇的经济承受能力和科技力量,采用组件式GIS与可视化开发语言的集成二次开发方式,设计和开发了实用的小城镇综合地理信息系统.介绍了系统的技术框架,以其中的土壤资源管理子系统为例说明系统的开发过程,讨论了系统建设需要解决的几项关键问题.通过该系统可实现小城镇的资源、规划管理及工业、农业、商业,税务.交通等的统计、查询、分析及决策功能,同时可提供相应的图文资料.