OBS核心控制卡网管代理接口的设计与实现

设计了光突发交换(OBS)核心节点中控制卡上的网管代理接口,设计了相关的通信协议、硬件结构和硬件逻辑接口,在跨总线与跨时钟域连接中维护了数据的完整性.仿真表明,设计的接口可实现OBS核心控制卡和本地网管代理之间的高速数据交互.     

半导体封装测试厂库存控制系统的研究

在制品库存控制是生产制造系统的一项重要活动,它直接关系到工厂的产出、生产周期和物料投放。当前很多半导体封装测试厂还没有形成一个系统化的库存管理模式,导致库存过高或不均, 直接影响产出和生产成本。文章将阐述半导体封装测试厂如何选用并有效实施CONWIP系统,以及它在生产控制、降低库存和缩短生产周期上发挥的积极作用。     

Gateway performance for network‐controlled WLAN IP mobility

‘Always on’ broadband‐accessed network gateway (GW) control can facilitate inter‐WLAN IP mobility, with seamless connectivity. The GW server plays a critical role in the overall WLAN IP (WIP) mobility architecture (IEEE Wireless Communications and Networking Conference, WCNC, Atlanta, GA, 21 March 2004; Int. J. Wireless Inf. Networks 2006; 13 (3):173–192). This paper provides a comparison of WIP with cellular IP (CIP) and mobile IP (MIP), and identifies the main requirements for a broadband‐accessed network‐based GW that supports WIP mobility. The paper then evaluates GW‐contributed handoff message processing delay in the WIP architecture through an analytical system model and OPNET simulation model, and provides a comparison of the GW‐contributed handoff message processing delays for non‐preemptive vs preemptive queuing schemes. Both analytical and simulation results show that WIP handoff message processing delay at the GW has negligible impact on the overall system delay. Finally, this paper presents the simulation results of the fast routing table lookup and forwarding speed on the GW overall performance, which can assist service providers in the challenging implementation issues that they face. Copyright © 2007 John Wiley & Sons, Ltd.     

国家频谱管理系统的分析与设计

频谱是至关重要的国有资源,国家频谱管理的主要任务是制定国家无线电频率划分策略、科学地进行频率规划、组织制定无线电通信系统及设备参数标准、频率台站管理、无线电监测等,目标是使频谱资源得到最高效的利用而使干扰最小。结合我国的实际情况,对频谱管理系统进行功能加强,设计了适合我国的频谱管理系统。     

新一代IC-CAM系统的功能改进

文章介绍了第二代集成电路计算机辅助制造(IC-CAM)系统。该系统在第一代IC-CAM系统基础上，全面改进了操作员予系统、调度员予系统和质检员予系统，实现了控制图的自动绘制和判剐，添加了流水周期控制模块；加强了设备管理予系统功能，形成了完整的设备运行记录，并具有提示定期维护的功能；新增了厂务管理予系统，实现了厂务环境数据的自动采集。使用该IC-CAM系统后，可有效地提高生产效率和产品质量。     

半导体工艺线CAM及SPC的应用

探讨了在多品种小批量半导体工艺生产线上开发应用CAM技术及实现SPC控制的方法。作者及同事开发了适用于所在工艺线特点的CAM软件系统程序——WI系统,用于工艺的指导和记录、生产的安排和监控以及数据的记录和提取。利用SPC方法对由WI提取的数据进行统计分析处理,做出控制图,对各种工艺异常进行分析判断进而做出工艺调整,以实现有效的工艺监控,逐步提高工艺加工能力和稳定性。该生产控制方法的应用为工艺线产品的研制和生产提供了有力保证。     

New centralized automatic vehicle location communications software system under GIS environment

Recent advances in wireless communications and networks have integrated relatively new technologies such as Global Positioning System (GPS), to the popular Global System for Mobile Communication (GSM), second generation cellular systems and the Geographic Information Systems (GIS) technologies. Automatic Vehicle Location (AVL) is based on a combination of GPS, GIS and telecommunication technologies. Automatic Vehicle Tracking systems are more and more used for different purposes, especially those related to tracking one vehicle or a fleet of vehicles. In this work, we introduce a new AVL system, which is based and developed under GIS software environment. The centralized software at the control station offers a new technology of transferring the intelligence of tracking system from the car unit, into the control office PC software. Centralized software will reduce the programming efforts in the car unit and will offer better fleet management. Moreover, the core of our system is based on the objects or the controllers of the GIS software, which reduces dramatically the overall system cost. Our system provides an easy access to change the functions of the system, with great possibility to satisfy the local needs. The design of our software will be presented with an explanation of the new supporting technologies that were to create the system. Finally, our software system has been validated using data from local road networks. Copyright © 2005 John Wiley & Sons, Ltd.     

A novel constellation amplitude modification method for PAPR reduction in OFDM systems

In this paper, we propose a constellation amplitude modification (CAM) method to reduce the peak‐to‐average power ratio (PAPR) in orthogonal frequency division multiplexing systems. The key idea of the proposed CAM method is to modify the original constellation amplitude and choose the constellation points with the minimum PAPR as the transmitted constellation points. The CAM method formulates the PAPR reduction as a convex optimization problem, and then, it applies the customized interior‐point method to solve the optimization problem. Compared with the traditional methods, the CAM method does not increase the transmit power, and the receiver has no additional operations. Simulation results show that the CAM method converges fast and offers significant PAPR reduction. Copyright © 2016 John Wiley & Sons, Ltd.     

A systematic literature review of machine learning applications in IoT

The Internet of Things (IoT) is a network of interconnected smart objects having capabilities that collectively form an ecosystem and enable the delivery of smart services to users. The IoT is providing several benefits into people's lives through the environment. The various applications that are run in the IoT environment offer facilities and services. The most crucial services provided by IoT applications are quick decision for efficient management. Recently, machine learning (ML) techniques have been successfully used to maximize the potential of IoT systems. This paper presents a systematic review of the literature on the integration of ML methods in the IoT. The challenges of IoT systems are split into two categories: fundamental operation and performance. We also look at how ML is assisting in the resolution of fundamental system operation challenges such as security, big data, clustering, routing, and data aggregation.     

A WIP Balancing Procedure for Throughput Maximization in Semiconductor Fabrication

In a semiconductor fabrication line (fab), high throughput often guarantees high revenue and profit since relatively constant operating cost is required throughout the year; however, maintaining high throughput has been a challenging task due to complicated operational variables in a modern high-end wafer fabrication line. To deal these variables, the industry has developed a fab scheduling system consisting of several functional modules that focus on different areas of decision making. WIP balancing, which aims to prevent starvation of bottleneck toolsets, has been an important component for fab scheduling. This research proposes a new WIP balancing concept, which directly considers load levels of bottleneck toolsets for higher throughput. Also, an MIP (mixed integer programming) model is developed for the new WIP balancing. A performance test shows that the new approach increases throughput, especially when WIP level and product routing flexibility are low.      

基于脉冲成形技术降低OFDM峰均比

正交频分复用（OFDM）利用相互正交的多个子载波来传输信息,具有较高的频谱利用率和良好的抗多径干扰能力,适用于高速数据传输,成为第四代移动通信的核心技术之一。但OFDM系统中一个最主要的缺点在于OFDM信号的峰值平均功率比（PAPR）很大,这容易导致系统线性功放的效率降低。研究了将脉冲成形应用到OFDM系统来降低PAPR的技术,以及脉冲波形的选取。仿真结果表明该方法能有效降低OFDM系统的PAPR,而且不影响系统的BER性能。     

一种远程辅助勘察系统的设计与实现

针对4G无线项目勘察过程中,现场勘察资料可靠性不高、管理不集中等问题,本文设计实现了一种远程辅助勘察系统,以信息化、集中化的方式管理、审核现场勘察信息,提高勘察数据的准确性和使用效率。     

SDH多业务传输平台(MSTP)路由算法

多业务传输平台(MSTP)的出现使得同步数字体系(SDH)网络可以传输多种业务.路由和保护模块是网络管理软件的核心模块之一.由于网络成本的限制,在网络中往往会出现多种工作方式不完全一致的设备,增加了路由的复杂性.文章对多设备多业务的SDH网络的路由和保护进行了分析,分别给出了电路业务和数据业务的路由算法.此算法已成为华环公司网络管理系统的核心模块.     

An integrated framework for wireless sensor network management

Wireless sensor networks (WSNs) have significant potential in many application domains, ranging from precision agriculture and animal welfare to home and office automation. Although sensor network deployments have only begun to appear, the industry still awaits the maturing of this technology to realize its full benefits. The main constraints to large‐scale commercial adoption of WSN have been the lack of available network management and control tools, such as for determining the degree of data aggregation prior to transforming it into useful information, localizing the sensors accurately so that timely emergency actions can be taken at an exact location, routing data by reducing sensor energy consumption, and scheduling data packets so that data are sent according to their priority and fairness. Moreover, to the best of our knowledge, no integrated network management solution comprising efficient localization, data scheduling, routing, and data aggregation approaches exists in the literature for a large‐scale WSN. Thus, we introduce an integrated network management framework comprising sensor localization, routing, data scheduling, and data aggregation for a large‐scale WSN. Experimental results show that the proposed framework outperforms an existing approach that comprises only localization and routing protocols in terms of localization energy consumption, localization error, end‐to‐end delay, packet loss ratio, and network energy consumption. Moreover, the proposed WSN management framework has potential in building a future “Internet of Things”. Copyright © 2012 John Wiley & Sons, Ltd.     

AFDX端系统协议软件设计与实现

网络作为航电系统的核心部分,其性能直接影响航电系统。AFDX网络是新一代航空电子系统的传输网络技术,具有高速、确定性和稳定性的特点。在深入研究AFDX网络协议的基础上,结合航电网络的实际应用,根据AFDX端系统关于冗余管理、完整性检测和VL隔离的特点,提出了一种AFDX端系统协议软件的设计方法。该方法通过采样、队列和SAP三类端口实现了AFDX标准数据的发送和接收功能,支持10(Mb.s-1)/100(Mb.s-1)的数据传输,并采用了VL管理、冗余管理和完整性检测方法,有效提高了数据传输的确定性和稳定性。多次的功能和性能测试表明,该软件设计方法实现了ARINC664 P7协议规定的AFDX端系统协议栈功能,具有良好的正确性和可靠性。     

一种基于混合策略的失衡数据集分类方法

提出了一种有效应用于失衡数据集的分类方法,其核心思想是从样本预处理和分类器改进两方面入手,为失衡数据集的分类问题提供全面的解决方案.首先创造性地采用动态自组织映射聚类的方法对失衡数据集进行重采样,这种采样方法,有效地解决了传统重采样的方法随机性强,人为主观干扰以及信息损失等弊端.随后借助K-近邻规则的思想,对新采集的样本进行剪枝,有效地解决了实际存在的数据混叠现象.算法对SVM的核函数进行等角变换,由此对类边界进行了校准,以适应样本类别失衡的情况.通过对三种算法的对比实验证明了算法在失衡数据集分类上的有效性.本文的算法已经在答案抽取技术中得到了成功应用,并在TREC2006国际QA 评测中得到了客观充分的验证.     

Public perceptions on artificial intelligence driven disaster management: Evidence from Sydney,Melbourne and Brisbane

In recent years, artificial intelligence (AI) is being increasingly utilised in disaster management activities. The public is engaged with AI in various ways in these activities. For instance, crowdsourcing applications developed for disaster management to handle the tasks of collecting data through social media platforms, and increasing disaster awareness through serious gaming applications. Nonetheless, there are limited empirical investigations and understanding on public perceptions concerning AI for disaster management. Bridging this knowledge gap is the justification for this paper. The methodological approach adopted involved: Initially, collecting data through an online survey from residents (n = 605) of three major Australian cities; Then, analysis of the data using statistical modelling. The analysis results revealed that: (a) Younger generations have a greater appreciation of opportunities created by AI-driven applications for disaster management; (b) People with tertiary education have a greater understanding of the benefits of AI in managing the pre- and post-disaster phases, and; (c) Public sector administrative and safety workers, who play a vital role in managing disasters, place a greater value on the contributions by AI in disaster management. The study advocates relevant authorities to consider public perceptions in their efforts in integrating AI in disaster management.     

基于FPGA的多源信息实时传输系统

针对多传感器协同采集信息,提出了一种基于FPGA的多源信息实时传输系统。利用FIFO缓存各路数据,根据数据特性自动识别优先级,采用智能编队机制,动态传输各路数据。该系统具有通用性强、信道利用率高、智能化和可扩展性的优点,目前已成功应用于多项国家"863"预研项目和无人机及飞艇等型号项目中。实际应用证明,该系统运行稳定可靠,适应性强。     

基于两个平行马赫-增德尔调制器的光载无线传输系统

为提高光载无线(radio over fiber,RoF) 传输系统中的光波信号的利用率,本文提出了一种基于两个平行马赫-增德尔调制器 (Mach-Zehnder modulator,MZM) 的RoF传输系统。两个平行MZM经射频(radio frequency,RF) 信号调制后,产生5个光边带信号,分别是正负一阶光边带、正负二阶光边带和光载波。其中正负二阶光边带使用基带数据进行调制,经光电检测器(photodiode,PD) 拍频后产生已调数据的毫米波信号,再由天线发射出去。正二阶边带和光载波经PD拍频后产生未调制数据的毫米波,该毫米波用于接收端解调的本振信号(local oscillator,LO) 。负二阶边带信号用于上行链路的光载波。在本系统中,5个光边带信号都被充分利用,提高了光信号的利用效率。此外,还分析了该系统通过色散介质的传输特性,为RoF通信系统提供了一种实用化的解决方案。     

Improving node behaviour in a QoS control environment by means of load‐dependent resource redistributions in LANs

An important means to guarantee an acceptable quality of service in networks with real‐time communication requirements is the reservation of resources at connection setup time. However, such reserved resources, e.g. transmission bandwidth, may be unused as a consequence of the variations in the actual resource demands. Therefore, a more efficient resource utilization is possible if communicating stations or end‐users dynamically hand over some of the free resources temporarily to the other communication partners, e.g. of a ‘broadcast network’. This paper concentrates on two fundamental problems of such a demand‐based sharing of resources: on the one hand, estimation of the current resource requirement on the basis of load measurements is investigated and, on the other hand, we elaborate efficient algorithms for resource sharing respecting real‐time requirements. The algorithms proposed for load estimation and for resource sharing are evaluated analytically with respect to their efficiency for worst‐case, average‐case and realistic load scenarios. Our approach suggested for resource and traffic management allows one to achieve significantly better utilization of network resources. Copyright © 2005 John Wiley & Sons, Ltd.