Influence of Randomly Varying Birefringence on Soliton Switching

In this paper, the effects of the randomly varying birefringence on soliton switching in the twin-core fiber are discussed through a nonlinear coupling equation , some novel and useful results on soliton switching are obtained.     

Concurrent enhancement of network throughput and fairness in optical burst switching environments

In this article, we propose and evaluate a preemption-based scheme for the concurrent improvement of network throughput and burst fairness in optical burst switched networks. The scheme uses a preemption weight consisting of two terms: the first term is a function of the size of the burst and the second term is the product of the hop count times the length of the lightpath of the burst. The second term is adjusted by a minimum function to prevent the problem of reverse unfairness. Extensive simulation tests showed that the application of the scheme results in higher throughput and at the same time improves the fairness coefficient. The scheme is further enhanced by combining it with a fairness-improving scheme previously proposed in the literature. Detailed performance tests are presented and analyzed.     

Low-latency optical network based on wavelength division multiplexed clockwork routing

Optical networks based on the ‘clockwork’ routing mechanism have significant advantages for high-speed optical packet switched applications in which latency is critical, such as parallel and distributed computing. The main advantages are that no optical buffers and no centralized contention arbitration are required. However, the network performance decreases rapidly with increasing network size. This article proposes the use of wavelength division multiplexing, in combination with clockwork routing, to provide significant improvements in network scalability and bisection bandwidth, resulting in higher throughput and reduced latency.     

防爆型激光指向仪中的He-Ne激光电源

详细介绍了一种小型激光电源的设计，分析和应用。该激光电源较传统激光电源具有重量轻、体积小，成本低等优点；结构简单。     

PWM开关变换器的建模方法综述

介绍了PWM开关变换器的主要建模方法:状态空间平均法、等效电路法、离散时域法、动态向量法以及等效小参量法,叙述了它们的理论依据,并分析了各自的优缺点。     

高性能PWM型DC-DC升压变换器研究

设计了一种单片集成PWM型电流模式升压变换器,芯片内部集成了耐压22V的DMOS功率开关管,开关频率为1.6MHz,采用1.5μmBCD工艺实现。芯片具有很宽的输入电压(2.7~14V)、高效率(85%)、低关断电流、快速暂态响应和低功耗等特性,适宜于用作便携式设备的电源管理,也可作为IP核,嵌入同种工艺下的其它芯片。文中除了对芯片设计方法、思路及主要电路模块结构的设计方案进行讨论外,还提出了减小单片集成开关电源噪声的措施。     

Fast blocking probability evaluation of end-to-end optical burst switching networks with non-uniform ON–OFF input traffic model

A novel, accurate, numerically stable and fast mathematical method for network-wide blocking probability evaluation of end-to-end optical burst switching (OBS) networks with heterogeneous link capacity under non-uniform traffic is proposed. Unlike most of previous works, which have used the Poisson model for the burst traffic, this paper considers a non-uniform ON–OFF model being a more realistic choice for OBS networks. Compared with simulation, the method was proved to be very accurate and much faster (up to four orders of magnitude faster than simulation in the studied cases). These features make the proposed method very useful for network analysis, especially for large size networks where simulation time can be prohibitively high.     

Analysis and design of switched normal systems

In this paper, we study the stability property for a class of switched linear systems whose subsystems are normal. The subsystems can be continuous-time or discrete-time ones. We show that when all the continuous-time subsystems are Hurwitz stable and all the discrete-time subsystems are Schur stable, a common quadratic Lyapunov function exists for the subsystems and thus the switched system is exponentially stable under arbitrary switching. We show that when unstable subsystems are involved, for a desired decay rate of the system, if the activation time ratio between stable subsystems and unstable ones is less than a certain value (calculated using the decay rate), then the switched system is exponentially stable with the desired decay rate.     

Switching to nonhyperbolic cycles from codim 2 bifurcations of equilibria in ODEs

The paper provides full algorithmic details on switching to the continuation of all possible codim 1 cycle bifurcations from generic codim 2 equilibrium bifurcation points in n-dimensional ODEs. We discuss the implementation and the performance of the algorithm in several examples, including an extended Lorenz-84 model and a laser system.     

基于MSP430单片机的开关稳压电源设计

介绍基于MSP430单片机的开关稳压电源的系统结构和总设计方案。该设计硬件电路由整流滤波电路、升压斩波电路、PWM驱动电路及保护电路组成。该系统的软件是在IAR Embedded Workbench开发环境下采用C语言编写,主要包括12位高精度A/D采集、PWM驱动电路、过流保护等模块的设计,同时具有键盘设定、液晶显示实时等功能。