基于VXI总线的超宽带线性调频信号源的设计

主要介绍了VXI总线C尺寸超宽带线性调频信号源的设计方法，重点描述了利用现场可编程逻辑器件FPAG和DSP设计VXI总线接口电路，以及数字波形存储直读技术在线性调频信号源中的应用。     

钻井参数仪的模块化设计方法研究

文章以模块化设计原理为基础，讨论了钻井参数仪的模块划分，模块化设计准则和主要设计内容。采用模块化设计方法、现场设备网络的开放网络和现场总线解决方案设计的钻井参数仪，具有传输信号稳定、可靠性高、抑制噪声能力强、组建现场网络成本低等特点。     

石油化工可燃气体或蒸气排放系统的消防安全设计

石油化工生产装置大多是通过火炬燃烧排放易燃易爆气体或通过放空管将易爆气体直接排入大气中。文章分析了火炬系统和放空管的火灾危险因素,并从火炬的布置、高度、排放能力、自动监控装置以及放空管的气体排放浓度、安装位置、安全装置等方面,重点论述了火炬系统和放空管的消防安全设计要点。     

用于有源电力滤波器的IGBT驱动及保护研究

介绍有源电力滤波器设计中EXB841型绝缘栅场效应晶体管(IGBT)驱动器的驱动原理和电路特点,对IGBT的栅极驱动特性、栅极串联电阻进行了探讨,给出过流保护和过压吸收的有效办法。样机试运行证明此种设计方案可靠、有效。     

新型微光探测器激光防护材料的研究

系统分析了微光夜视器的结构及其原理，并结合当前器件存在的激光致盲威胁，提出了增强系统安全的新措施。同时，系统地介绍了防激光滤光材料一些重要的性能参数以及滤光材料的组成、制备加工工艺。研究结果表明，新型的防激光材料能够有效地防护800nm，900nm以及10613nm等三个波长的激光，并且可见光透过率大于85％。     

IKE协议的安全性分析

在简略介绍IKE协议RFC2409工作机制的基础上,对协议现有的安全问题进行了分析,并针对协议阶段1中主模式与积极模式下身份保护存在的问题提出了协议修改建议,对阶段1中安全联盟建立的可靠性进行了探讨以加强协议抵御DoS攻击的能力。     

Capacity Efficiency and Restorability of Path Protection and Rerouting in WDM Networks Subject to Dual Failures

Resilient optical networks are predominately designed to protect against single failures of fiber links. But in larger networks, operators also see dual failures. As the capacity was planned for single failures, disconnections can occur by dual failures even if enough topological connectivity is provided. In our approach the design of the network minimizes the average loss caused by dual failures, while single failures are still fully survived. High dual failure restorability is the primary aim, capacity is optimized in a second step. For WDM networks with full wavelength conversion, we formulate mixed integer linear programming models for dedicated path protection, shared (backup) path protection, and path rerouting with and without stub-release. For larger problem instances in path rerouting, we propose two heuristics. Computational results indicate that the connectivity is of much more importance for high restorability values than the overall protection capacity. Shared protection has similar restorability levels as dedicated protection while the capacity is comparable to rerouting. Rerouting surpasses the protection mechanisms in restorability and comes close to 100% dual failure survivability. Compared to single failure planning, both shared path protection and rerouting need significantly more capacity in dual failure planning.     

带参数的一阶脉冲微分方程边值问题

利用上下解和单调迭代法。讨论了带参数的一阶脉冲微分方程。获得了单边Lipschitz条件下这类方程边值问题的解的存在性。     

On Finding the Multicast Protection Tree Considering SRLG in WDM Optical Networks

In this letter, a new sharing mechanism, SRLG sharing, is proposed, which allows the links of the same shared risk link group (SRLG) in a primary light tree to share protections in WDM optical networks. In previous studies, how to share spare resources with SRLG constraints has not been studied in multicast optical networks. In this letter, considering SRLG sharing, we propose a novel algorithm –multicast with SRLG sharing (MSS)– to establish a protection light tree. Finally, the algorithm MSS and the algorithm multicast with no SRLG sharing (MNSS) are compared through a simulation to show that our new sharing scheme of SRLG sharing is more efficient than that of no SRLG sharing in terms of spare resource utilization and blocking probability.     

城域波分网络中的光环路保护分析

介绍了在城域波分网络中应用的四种环形保护倒换方案及其实现方式，并对各种保护倒换方案的特性进行了分析比较。