基于AHP和MMTD的呼叫接纳控制方法AM-CAC

提出一种统一的呼叫接纳控制方法。应用层次分析过程(AHP)实现系统建模,根据网络运营目标,对于决策所依据的诸多准则之间的重要性关系进行定性分析和定量描述,从而确定各准则在决策中的影响力;应用中介真值程度度量(MMTD)方法统一量化各影响因素相对各准则的真值程度,通过配置合理参数,来适应异构网络在技术特性、性能目标上的差异。仿真结果表明,文中所提方法对于网络的运营目标和偏好具有很好的适应能力。     

家庭网络安全研究

目前,家庭网络是重点研究领域之一,家庭网络提供重要服务之一是远程控制家庭网络里的信息家电,由于家庭网络由异构网络协议和各种服务模型组成,远程控制服务导致家庭网络受到各种安全威胁.分析了国内外家庭网络研究现状和存在的安全威胁,对家庭网络安全研究的各种方法的优缺点进行了分类分析和总结,提出了家庭网络安全研究的科学问题与研究和发展方向,从而为家庭网络安全研究相关技术的进一步研究提供一定的理论基础.为用户提供简单易用、安全可靠的家庭网络环境,并提供隐私保护是家庭网络安全研究的最终目标.     

基于LabVIEW的虚拟任意信号发生器设计

为了解决传统的专用仪器开发难度大、周期长、成本高的问题,提出并实现了采用虚拟仪器技术实现的任意信号发生器,不但降低了开发成本,节省了开发时间,并且可以和其他虚拟仪器构成一个完整的实验系统而无需添加其他硬件产生信号输出供其他仪器使用.主要利用LabVIEW编程,在计算机内产生信号的数据,通过D/A模块将产生的数据按照一定的速率输出,从而得到连续的模拟信号波形.用户可以通过此虚拟任意信号发生器自己编辑波形,从而在真正意义上实现任意波形发生器功能.     

Joint relay selection and power allocation for amplify-and-forward two-path relaying networks

This paper presents a joint relay selection and power allocation scheme for amplify-and-forward two-path relaying networks,in which diferent relay nodes forward information symbols alternatively in adjacent time slots.Our approach is based on the maximization of the received signal-to-noise ratio under total power consumption by the transmission of the symbol.We show that in spite of inter-relay interferences,the maximization problem has a closed-form solution.Simulation results explicitly indicate that the performance of proposed approach outmatches the existing methods including equal power allocation and one-path relaying.     

A mathematical morphology-based multi-level filter of LiDAR data for generating DTMs

Light detecting and ranging(LiDAR)technology has become an efective way to generate highresolution digital terrain models(DTMs).To generate DTMs,point measurements from non-ground features,such as buildings,vegetation and vehicles,have to be identifed and removed while preserving the terrain points.This paper proposes an efcient mathematical morphology-based multi-level flter to generate DTMs from airborne LiDAR data.Preliminary non-ground points are frst identifed with the characteristics of the multiecho airborne LiDAR data.The localized mathematical morphology opening operations are then immediately applied to the remaining points.By gradually increasing the window size of the flter and using a dynamic critical gradient threshold,the non-ground points are removed,while the ground points are preserved.Eight samples were chosen from eight sites provided with the ISPRS Commission III,Working Group 3,to evaluate the accuracy of our algorithm.Both the qualitative and quantitative experiment analyses show that our morphologybased multi-level flter method achieves promising results,not only in flat urban areas but also in rural areas,especially in preserving complex terrain details,while non-ground spatial objects are removed.     

基于WinCC Flexible和PLC的高压发泡机控制系统设计

设计以西门子S7-300PLC和MP277 Touch触摸屏为控制核心、具有多种工作模式选择的高压发泡杌控制系统,解决了注射流量比例的精确控制、自动补料、故障报警、压力控制、工艺过程实时监控等问题,实践证明该系统稳定、可靠、易于操作,满足了系统的要求.     

A suboptimal joint bandwidth and power allocation for cooperative relay networks＂ a cooperative game theoretic approach

In commercial networks, user nodes operating on batteries are assumed to be selfish to consume their resources (i.e., bandwidth and power) solely maximizing their own benefits (e.g., the received signal-to-noise ratios (SNRs) and datarates). In this paper, a cooperative game theoretical framework is proposed to jointly perform the bandwidth and power allocation for selfish cooperative relay networks. To ensure a fair and efficient resource sharing between two selfish user nodes, we assume that either node can act as a source as well as a potential relay for each other and either node is willing to seek cooperative relaying only if the datarate achieved through cooperation is not lower than that achieved through noncooperation (i.e., direct transmission) by consuming the same amount of bandwidth and power resource. Define the cooperative strategy of a node as the number of bandwidth and power that it is willing to contribute for relaying purpose. The two node joint bandwidth and power allocation (JBPA) problem can then be formulated as a cooperative game. Since the Nash bargaining solution (NBS) to the JBPA game (JBPAG) is computationally difficult to obtain, we divide it into two subgames, i.e., the bandwidth allocation game (BAG) and the power allocation game (PAG). We prove that both the subgames have unique NBS. And then the suboptimal NBS to the JBPAG can be achieved by solving the BAG and PAG sequentially. Simulation results show that the proposed cooperative game scheme is efficient in that the performance loss of the NBS result to that of the maximal overall data-rate scheme is small while the maximal-rate scheme is unfair. The simulation results also show that the NBS result is fair in that both nodes could experience better performance than they work independently and the degree of cooperation of a node only depends on how much contribution its partner can make to improve its own performance.     

电力系统自动化技术

介绍自动化技术在发电系统、电网调度系统、配电网络和变电系统中的应用现状,分析电力系统自动化技术的发展趋势,结合具体实例说明电力系统自动化技术的应用.     

1780mm热轧层流冷却自动控制系统的控制模型

以某1780mm热连轧机层流冷却系统为对象,建立层流冷却控制模型,并在实际使用中对影响其控制精度的一些因素进行分析.     

开关跳闸的原因及对策

分析日常生产及供电系统中,空气开关(断路器)跳闸的可能原因,并结合现场实际情况给出相应的处理方法与对策.