Dynamic quality of transmission optimization and global impairments control in reconfigurable transparent WDM networks:schemes and demonstrations

<正>Two novel dynamical quality of transmission(QoT) optimization schemes with explicit optimization targets and accurate end-to-end QoT estimation are proposed for reconfigurable transparent wavelength-division multiplexing(WDM) networks.Numerical simulations show that the scheme of quality(Q) best has the best Q factor improvement with large attenuation adjustment.The scheme of Q allowable can achieve minimized number of tuning sites and attenuation adjustment and also improve the Q factor of light path to the required value.In addition,the idea of dynamic QoT optimization and global impairment control has been experimentally demonstrated on a simple mesh network by the cooperation of a control plane and tunable devices.     

《无机化学学报》投稿须知(NOTICE TO AUTHORS)

<正>《无机化学学报》是中国化学会主办的学术期刊,面向国内外发行。主要报道我国无机化学领域的基础理论和应用基础理论研究成果,促进国内外学术交流,繁荣无机化学学科。它涉及的内容有固体无机化学、     

Cascades with coupled map lattices in preferential attachment community networks

In this paper, cascading failure is studied by coupled map lattice （CML） methods in preferential attachment community networks. It is found that external perturbation R is increasing with modularity Q growing by simulation. In particular, the large modularity Q can hold off the cascading failure dynamic process in community networks. Furthermore, different attack strategies also greatly affect the cascading failure dynamic process. It is particularly significant to control cascading failure process in real community networks.     

平衡滤波器的计算方法

文章介绍了将多级平衡滤波器转换成多级等效梯形网络的物理思想和具体方法，再利用计算梯形网络的程序算出多级平衡滤波器的输入阻抗和插入损耗。     

A novel optical burst switching architecture for high speed networks

A novel optical burst switching （OBS） high speed network architecture has been proposed. To verify its feasibility and evaluate its performance, just-enough-time （JET） signaling has been considered as a high performance protocol. In the proposed architecture, to avoid burst losses, firstly, a short-prior- confirmation-packet （SPCP） is sent over the control channel that simulates the events that the actual packet will experience. Once SPCP detects a drop at any of the intermediate nodes, the actual packet is not sent but the process repeats. In order to increase network utilization, cost effectiveness and to overcome some limitations of conventional OBS, inherent codes （e.g., orthogonal optical codes （OOC））, which are codified only in intensity, has been used. Through simulations, it shows that a decrease in burst loss probability, cost effectiveness and a gain in processing time are obtained when optical label processing is used as compared with electronic processing.     

一种时序逻辑网络的快速设计方法

引用1984年尹克震提出的“开关函数的反演公式”,采用伪随机序列技术的思想,提出移位寄存器型时序逻辑网络的一种快速设计方法。     

Kohonen网络在电容CT图像重建中的应用

提出一种采用Ｋｏｈｏｎｅｎ网络算法进行１２电极电容ＣＴ系统的图像重建的方法．该网络由输入和输出两层神经元组成,输入为１２电极电容ＣＴ系统测量所得的６６个电容值,输出对应管道介质的空间分布模式．该网络采用竞争算法无监督学习,实验结果证明,该网络有较强的抗噪声能力,可重建出较精确的介质分布图像     

一种改进的参考点同步模型多媒体同步控制方法

首先介绍了多媒体同步的分类,并指出了实现多种媒体同步的关键就在于建立适当的同步控制模型;接着分析了现在流行的３ 种单一同步模型以及二级同步模型,评价了它们各自的优点与缺陷． 在此基础上,提出了一种改进的参考点同步模型多媒体同步输出控制方法,这种折衷的同步控制方法,在一定程度上弥补了单一同步模型和二级同步模型各自的缺陷．     

通信网络动态优化与控制研究

引入现代控制科学,建立了一般通信网络的状态控制模型与目标控制模型,利用庞特李亚金极大值原理,研究通信网络最优控制的基本条件、本质意义与一般实现途径,证明了哈密尔顿函数协状态变量稳定解的性质及其在通信网动态优化与控制中的作用与地位。