LISP controller: a centralized LISP management system for ISP networks

As the current Internet architecture is suffering from scalability issues, the network research community has proposed alternative designs for the Internet architecture. Among those solutions that adopt the idea of locator/identifier split paradigm, the locator/identifier separation protocol (LISP) has been considered as the most promising solution because of its incrementally deployable feature. Despite various advantages provided by LISP, many ISPs are still conservative to adopt LISP into their production network because the standard LISP does not fully satisfy ISP's requirements on LISP‐enabled services. In this paper, we define ISP's requirements on LISP‐enabled commercial services and describe limitations of the standard LISP from an ISP's perspective. Also, we propose LISP controller, a centralized LISP management system. By using LISP controller, we evaluate three ISP's representative LISP use cases: traffic engineering, virtual machine live migration, and vertical handover. The results show that the proposed LISP controller provides centralized management, controllability, and fast map entry update, without any modifications on the standard LISP. LISP controller allows an ISP to control and manage its LISP‐enabled services while satisfying ISP's requirements. Copyright © 2015 John Wiley & Sons, Ltd.     

Application of Optimal Control Theory to Fourier Transform Ion Cyclotron Resonance

We study the application of Optimal Control Theory to Ion Cyclotron Resonance. We test the validity and the efficiency of this approach for the robust excitation of an ensemble of ions with a wide range of cyclotron frequencies. Optimal analytical solutions are derived in the case without any pulse constraint. A gradient-based numerical optimization algorithm is proposed to take into account limitation in the control intensity. The efficiency of optimal pulses is investigated as a function of control time, maximum amplitude and range of excited frequencies. A comparison with adiabatic and SWIFT pulses is done. On the basis of recent results in Nuclear Magnetic Resonance, this study highlights the potential usefulness of optimal control in Ion Cyclotron Resonance.     

HTTP/2.0关键技术及标准化进展

HTTP/2.0是标准化组织IETF正在制定中的新一代WWW应用协议标准,在保持对现有协议HTTP/1.1的前向兼容性的前提下,以异步并发、增量传输和关键内容优先等机制为手段,以期提升广域网网页浏览和移动应用的用户体验。互联网厂家和设备厂家分别从最大化Web应用加速效果、权衡移动终端综合效能和降低网络设备处理复杂度的角度,提出了不同的技术建议方案。     

一种特殊数字滤波器的优化结构

提出一种特殊数字滤波器的结构优化方案,可以简化滤波器结构、节省电路面积。将该方案应用于解调ISO/IEC 14443协议规定的PICC到PCD的副载波调制信号。在此基础上,改变子滤波器的位置,将长延迟链前移,减少了长延时链的数据位宽。综合结果表明,该滤波器的面积仅为传统滤波器的50%。     

Art-net网络协议在灯光系统工程的运用

现代电视台演播厅的整体灯光布线系统已经进入新的时代,传统的DMX512工程布线方式虽然在信号传送方面仍然占据主导地位,但有一种新的以以太网协议为基础的布线方式已经悄悄地在主线传输方式上被运用,这种以太网协议就是Art-net网络协议。     

基于SIP协议的MWI模型设计

针对终端的多种MWI功能需求,提出了一种基于SIP协议扩展的消息等待通知模型,同时在智能网平台完成消息仿真,并结合实例分析如何构造事件通知系统,仿真结果证明SIP MWI易实现且效率高。     

HTCC工艺通用自动上下料系统设计与实现

基于欧姆龙CJ系列可编程逻辑控制器(PLC)的控制平台,设计并实现了一种高温共烧陶瓷(HTCC)带料通用自动上下料系统.从机械、电气和程序3个角度分别阐述了设备的设计思路和工作原理.利用模块化机械结构实现了带料的定位取放;并对机构设计中的定位精度问题进行分析和计算,得到了预期的设计结论.电气部分通过Ethernet协议实现SMC LEFB25电动缸与PLC之间的通信,并利用欧姆龙NB系列触摸屏(HMI)实现人机交互.利用欧姆龙专用编程软件CX-Programmer实现了PLC的模块化程序设计.所设计的自动上下料系统能够为多种HTCC带料加工设备完成上下料操作,并已经在生产线上投入使用,批量产品一致性得到显著提升.     

一种基于LEACH-C改进的能量有效分簇协议

针对LEACH-C协议周期性地簇重构会造成额外开销以及簇头节点和普通节点间能耗不均的缺陷,提出了改进的能量有效分簇协议(Improved Energy-Efficient Clustering Hierarchy,IEECH)。在IEECH中,由簇中所选出的发送节点分担簇头节点的高能量负载,因此不再需要进行全局的簇重构。网络节点的能耗由于发送节点的轮转进一步得到了均衡。因此,该算法和LEACH以及LEACH-C相比,可以有效地延长网络的寿命。最后,通过NS2仿真实验也得到了验证。     

A secure and low‐energy zone‐based wireless sensor networks routing protocol for pollution monitoring

Sensor networks can be used in many sorts of environments. The increase of pollution and carbon footprint are nowadays an important environmental problem. The use of sensors and sensor networks can help to make an early detection in order to mitigate their effect over the medium. The deployment of wireless sensor networks (WSNs) requires high‐energy efficiency and secures mechanisms to ensure the data veracity. Moreover, when WSNs are deployed in harsh environments, it is very difficult to recharge or replace the sensor's batteries. For this reason, the increase of network lifetime is highly desired. WSNs also work in unattended environments, which is vulnerable to different sort of attacks. Therefore, both energy efficiency and security must be considered in the development of routing protocols for WSNs. In this paper, we present a novel Secure and Low‐energy Zone‐based Routing Protocol (SeLeZoR) where the nodes of the WSN are split into zones and each zone is separated into clusters. Each cluster is controlled by a cluster head. Firstly, the information is securely sent to the zone‐head using a secret key; then, the zone‐head sends the data to the base station using the secure and energy efficient mechanism. This paper demonstrates that SeLeZoR achieves better energy efficiency and security levels than existing routing protocols for WSNs. Copyright © 2016 John Wiley & Sons, Ltd.