一种智能电视终端在线自适应多资源调度方法

针对智能电视终端面临的运行时资源冲突和过载控制问题,提出一种在线自适应多资源调度方法(OARSA).该方法根据资源特点和应用优先级对独占型资源进行动态优先级抢占式调度,避免了资源冲突;采用反馈控制算法对共享型资源进行QoS调度,直到实现QoS比例公平性,并采用QoS比例压缩法消除资源过载.实验结果表明,OARSA具备过载控制能力,仅以系统总体QoS下降4.5％为代价,解决了资源冲突,并提高了系统重负载下的响应性能,且算法耗时比现有方法降低约30％,更加适用于智能电视终端的资源调度.     

基于移动应用层组播终端主动反馈的自适应负载均衡机制研究

在移动应用层组播通信中,热点地区可能会因用户过多而导致用户流服务满意度降低,非热点地区却可能会出现资源浪费现象,引起整个系统性能下降.提出了一种基于移动终端主动反馈的自适应负载均衡机制(Adaptive Load Balancing Mechanism based Mobile Terminal Active Feedback,ALBM-MTAF).ALBM-MTAF利用网络相关性能指标模拟移动终端(用户)所获得的流媒体服务满意度(Streaming Media Service Satisfaction,SMSS),通过终端用户主动反馈SMSS不断进行自适应的调整,将SMSS较差地域的子节点切换到SMSS较好的父节点上,从而实现整个系统的负载均衡.模拟实验表明,该机制具有良好的负载均衡效果,并能保证通信的质量.     

基于Android平台的保健食品移动监管系统

针对保健食品企业监管效率低以及管理模式的不健全, 提出一种基于Android平台的移动监管系统模式. 智能终端设备通过连接3G、4G等无线网络, 使监管人员在执法现场将采集的信息数据直接上传至服务器, 同时增设数据同步代理机制, 实时监听用户的离线和在线状态, 防止数据丢失, 再利用蓝牙无线通信技术实现监管数据的后台打印功能, 进一步简化执法流程. 本系统的应用实现了移动监管和移动办公的模式, 具有实际应用价值.     

多媒体车载终端电源系统的功耗管理设计

设计了一款稳定、高效的多媒体车载终端的电源系统。通过分析多媒体车载终端的功能模块供电系统,提出系统电源架构设计方案,实现了各个模块的电源分配与管理。针对车载终端的恶劣工作环境,设计相应的保护和抗干扰措施。对电源系统各个模块进行了器件选型和电路设计,并提出了系统功耗管理和省电流程实现方法。     

移动终端的USB3.0高速数据通路设计

现在USB接口已经成为移动终端最普及的接口,随着存储在移动终端媒体文件的容量越来越大,要求USB3.0接口支持的传输速度越快越好.为了匹配USB超速传输模式,本文在内存中专门规划一片区域用于USB数据缓冲,设计驱动,搭建测试环境,测试USB数据传输速度.经测试,USB数据传输速度有着明显的提高.     

基于GTM900-B的化学工业区气体检测终端设计与实现

化学工业区的中往往密布气体输送管道,这些管道专门布置在公共管廊中进行管理和监控,管道内易燃、易爆、有毒等气体泄漏的远程检测尤为重要。传统的检测设备具有一定的局限性,需要设计能联网的、小型化的、低成本的数据采集终端。因此设计出一种基于GTM900-B化学工业区气体检测终端,用于组建基于GPRS网络的化学工业区气体检测系统。该终端可向网络控制和管理中心发送可燃气体、氯气和氨气等气体泄漏数据,并且具有报警功能。软硬件测试和实际应用结果表明所设计终端的可行性和有效性。     

Finite‐time attitude stabilization for rigid spacecraft

This paper investigates the finite‐time attitude stabilization problem for rigid spacecraft in the presence of inertia uncertainties and external disturbances. Three nonsingular terminal sliding mode (NTSM) controllers are designed to make the spacecraft system converge to its equilibrium point or a region around its equilibrium point in finite time. In addition, these novel controllers are singularity‐free, and the presented adaptive NTSM control (ANTSMC) laws are chattering‐free. A rigorous proof of finite‐time convergence is developed. The proposed ANTSMC algorithms combine NTSM, adaptation and a constant plus power rate reaching law. Because the algorithms require no information about inertia uncertainties and external disturbances, they can be used in practical systems, where such knowledge is typically unavailable. Simulation results support the theoretical analysis.Copyright © 2013 John Wiley & Sons, Ltd.     

Multimode resonator based on composite right‐/left‐handed transmission line for UWB bandpass filter application

A new multimode resonator (MMR) using composite right‐/left‐handed transmission line (CRLH TL) is proposed and discussed. The CRLH TL structure is constructed by cascading interdigital coupled microstrip line sections on which short‐ended stepped impedance stubs are loaded. Dispersion characteristic of the transmission line structure is obtained using the Bloch–Floquet theory. The resonator, which has multiresonances electrical behaviors, is especially suitable in ultrawideband (UWB) applications. An UWB filter is presented as an illustration. With transmission zeros introduced at upper stopband, the filter has a sharp skirt performance. In addition, rejection level at lower stopband also gets enhanced due to direct current suppression effects of the multimode resonator. The filter prototype is implemented and measured. The measured results validate the theoretical analysis and show that the filter has a sharp skirt and an out‐of‐band rejection level as good as 38 dB. Meanwhile, return loss is better than 16 dB. © 2015 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:815–824, 2015.     

基于防冰专项管理平台及手持终端的输电线路覆冰观测与应用

针对贵州电网输电线路覆冰现状及目前线路观冰存在数据上报不及时、数据收集整理难等主要问题,引入了基于防冰专项管理平台及手持终端的输电线路覆冰观测思路,通过建立防冰专项管理平台、建立移动专线网络通道、固化覆冰数据收集及计算模板,以移动式手持终端为载体,实现现场观冰基础数据直接调用、现场覆冰数据填写、覆冰照片拍摄、现场自动计算覆冰厚度及覆冰比值、现场观冰数据实时上传及后台覆冰数据统计分析等管理,大大提高了输电线路现场观冰工作效率。     

Automatic Train Operation Based on Adaptive Terminal Sliding Mode Control

This paper presents an adaptive terminal sliding mode control(ATSMC) method for automatic train operation. The criterion for the design is keeping high-precision tracking with relatively less adjustment of the control input. The ATSMC structure is designed by considering the nonlinear characteristics of the dynamic model and the parametric uncertainties of the train operation in real time. A nonsingular terminal sliding mode control is employed to make the system quickly reach a stable state within a finite time, which makes the control input less adjust to guarantee the riding comfort. An adaptive mechanism is used to estimate controller parameters to get rid of the need of the prior knowledge about the bounds of system uncertainty. Simulations are presented to demonstrate the effectiveness of the proposed controller, which has robust performance to deal with the external disturbance and system parametric uncertainties. Thereby, the system guarantees the train operation to be accurate and comfortable.