Multisegment microstrip patch antenna with Y‐shaped feed

A new antenna structure comprising of multiple radiating microstrip patches, representing a figure of digit eight, proximity fed by a microstrip line is proposed. On a double‐layered substrate of FR4, this antenna achieves multiband functionality in the range of 3.81–12.42 GHz, which covers IEEE 802.11a standards and is suggestive of reconfigurability in frequency and pattern. Details of the antenna design, measured and simulation results are presented. © 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE , 2011.     

模块化的可重构制造系统研究

随着市场经济全球化的发展,可重构制造系统必将成为未来制造系统发展的新趋势,而可重构制造系统这个概念的提出是源于模块化机床和开放式体系结构控制器两种技术的日臻成熟。在分析了可重构制造系统和刚性制造系统、柔性制造系统区别的基础上,针对可重构制造系统的模块化特点及划分原则进行了详细分析,并对可重构制造系统的关键技术进行了研究。     

REFINE: The reconfigurable packet filtering on network processor

Network processors (NPs) are emerging as very promising platforms for developing reconfigurable and high‐performance network devices, due to their capability to combine the flexibility of general‐purpose processors with the high‐performance features of hardware‐based systems. They represent the most suitable solutions for implementing complex and dynamic tasks, such as packet classification and scheduling, which are key operations, for example, in DS networks. Programmability and reconfigurability allow NP‐based devices to be continuously adapted to the new network requirements, obtaining a high time in market. This paper illustrates the compound process that leads to the implementation of a reconfigurable multidimensional packet filtering on the Intel^® IXP2400 NP. The multidimensional multibit trie is chosen as the best algorithm to be implemented and it is modified to exploit the specific features of NP. The different tasks are mapped on the NP computational resources and an optimized implementation is performed, with subsequent experimental validation. Copyright © 2008 John Wiley & Sons, Ltd.     

Developing a reconfigurability index using multi-attribute utility theory

Reconfigurable manufacturing systems (RMSs) have been acknowledged as a promising means of providing manufacturing companies with the required production capacities and capabilities. This is accomplished through reconfiguring the system elements over the time for a diverse set of individualised products often required in small quantities and with short delivery lead time. This necessitates the requirement of mapping the manufacturing system capabilities and other characteristics by developing a suitable index. In this paper an index has been developed to measure the reconfigurability of RMSs keeping in mind their various core characteristics such as modularity, scalability, convertibility and diagnosability. These characteristics have been mapped together using multi-attribute utility theory. One could easily use this index to find the reconfigurability of a system possessing different characteristics. An illustrative example is provided to reveal the application of the proposed methodology on a given system. Insight gained would be of much interest to the decision makers managing the complexity of a manufacturing system for diversified products.     

Enabling Delivery of Mobile Services Over Heterogeneous Converged Infrastructures

Traditionally, end customers have been offered different categories of communication, data and media services (e.g., fixed/mobile voice, fixed/mobile data, broadcasting) through vertically separated, rigidly integrated infrastructures. Major advances in a variety of technological fields, mainly in the area of mobile computing and networking, have created prospects for a fully converged environment, where ubiquitous access to an abundance of value-added services will be offered over a single, as perceived by the users, highly reconfigurable system. This vision can be enabled by the seamless plugging of diverse access networks to a high-speed IP backbone; however the path to its realization poses a variety of additional challenges. The required support of complicated business models and service delivery over highly diverse contexts introduces significant complexity to service management and provision. The present contribution presents object-oriented mediating service management platforms as a catalyst for making these demanding tasks feasible, identifies their desired functionality and provides an overview of such a distributed framework that we have designed and prototyped. Furthermore, we demonstrate that the latter is able to be a critical enabler of flexible, adaptable service provision over future heterogeneous networks, while supporting advanced business paradigms.     

端到端重配置技术综述

端到端重配置(E2R)技术起源于软件无线电(SDR)技术,利用SDR终端和基站等可重配置实体为基础定义网络架构,结合先进的资源管理机制和灵活的空中接口实现技术,实现了对异构环境的灵活适应和对异构无线资源的有效利用。E2R技术研究中有3个关键点,包括E2R的体系结构、E2R的资源管理和E2R的空中接口实现,已取得较大成果。E2R技术作为一种具有高适变能力的技术,是使异构无线系统从目前的隔离态走向互通与协同、实现网络融合的最具发展潜质的无线网络技术。目前,E2R的研究已成为未来无线通信网络领域的关键课题之一。     

控制面故障下的飞机运动建模与重构控制能力分析及设计

对控制面故障影响飞机运动的机理进行了推导,系统地阐述了控制面故障下的飞机运动建模方法。在建模的基础上,对故障系统的可重构性进行研究。分别从线性系统运动和物理运动两个方面,给出了可重构能力的评定方案。推导了误差反向传播的前向神经网络用于控制系统设计时满足Lyapunov稳定性的学习算法,提出了一种新型的采用反向传播神经网络补偿常规控制器的重构飞行控制设计方案。采用非线性飞机运动模型对控制器进行了仿真,验证了重构飞行控制器的性能。     

基于机器人的可重构装配系统

本文分析了市场全球化给企业带来的挑战和机遇 ,提出了基于机器人的可重构装配系统 .在分析国外在可重构制造领域的研究状况的基础上 ,提出了基于机器人可重构装配系统的设计内容和方法 ,并提出了可重构装配系统今后需研究的方向     

基于可重构原理的组合夹具计算机辅助拼装方法研究

通过分析组合夹具结构是由不同核心组件重构结果的特征,提出将可重构原理引入组合夹具辅助拼装中,开发出了基于可重构核心组件元件库的组合夹具计算机辅助拼装系统。该系统将若干可独立完成各种功能的参数化（固定）的结构形式设为核心组件并构建了组合夹具元件库,提出一种典型路径的存储方法和结构设计组装模块工作流程。组件选择及装配实例表明该系统能较好地完成组合夹具的拼装任务。     

A framework to investigate the effectiveness of interconnection of power distribution systems subjected to hurricanes

Billions of dollars lost to natural disasters such as hurricanes are associated with infrastructure damage and power interruptions. Most utilities have radially operated systems and the existing supporting infrastructure may not provide possibilities to restore power from other substations that are not within the disaster areas. This would lower reliability during hazards especially for customers that are downstream of affected parts of the system. A potential strategy to remedy such situations entails extending feeders from different substations in the vicinity and connecting them with affected feeder lines from other substations. This paper presents a framework to study the effectiveness of constructing additional lines with switching devices to connect feeders from different substations to improve system performance. The framework incorporates a hurricane hazard model, a topologically based system performance measure, and cost analysis. A notional power distribution system of parts of Florida is used to demonstrate the proposed framework. The results show that improvement in system performance achieved by constructing new lines depends largely on hurricane path, number of new lines constructed as well as the length of the new lines. Longer lines have a high probability of failure which leads to only marginal improvement in system performance and high construction cost.