基于IDMEF的协作式入侵检测技术研究

介绍了入侵检测技术的发展和现状,阐述了协作式入侵检测技术中信息交换的产生背景和功能要求。主要讲述了如何利用入侵检测信息交换格式-IDMEF(Intrusion Detection Message Exchange Format)和入侵检测交换协议-IDXP(Intrusion Detection Exchange Protocol)来实现多个入侵检测系统之间的信息交换。     

基于风险事件的我国期货交易所的风险管理

期货交易所作为期货交易的组织者，在市场风险管理体系之中发挥着重要的作用。通过分析期货市场以往风险事件，发现我国期货交易所风险管理的问题主要在于制度约束效率低以及缺乏交易过程风险监控。建立基于风险管理的组织结构和基于市场异常情况监控的风险预警机制将有助于提高期货交易所风险管理水平，维护期货市场的稳定运行。     

基于STEP的RMS信息模型研究及实现

为了满足产品数字化协同研制模式对可靠性、维修性、保障性（RMS）数据共享和交换的要求，针对RMS工程的“全特性”、“全阶段”和“全系统”的特点，建立了基于产品模型数据交换标准（STEP）的RMS信息模型，并研究提出了该模型在产品数据管理系统（PDM）下的实现方法，最后给出了RMS模型及其实现方法在企业信息集成中的应用模式及案例验证。     

检验检疫区域数据交换中心应用研究

介绍检验检疫各直属局之间业务数据交换的现状及需求,提出检验检疫机构业务数据交换与共享存在问题研究,通过建设一个数据交换中心,实现多方数据交换利用,提高监管效率,实现快速验放通关,并希望通过区域数据中心的建设对其他检验检疫区域性业务数据交换提供借鉴模式。     

Valuation of expansion flexibility in flexible manufacturing system investments using sequential exchange options

In this paper, a valuation approach that modifies traditional discounted cash flow (DCF) methodology is presented to incorporate the option premium of expansion flexibility while evaluating a flexible manufacturing system investment. Expansion flexibility allows for changing the production capacity in response to deviations in demand, while disregarding the assumption that management makes an irrevocable decision based on its future market expectations. Expansion flexibility provides a key strategic advantage by avoiding the large financial commitment at the initial investment stage and enabling investment in a phased manner according to the changes in market conditions. The aim of this paper is to present a thorough valuation methodology that accounts for both the benefits of keeping the option to expand alive and the loss of market share to competing firms if the expansion investment were delayed. In this paper, the value of expansion flexibility is computed using sequential exchange options. The proposed method employs an analytic approximation scheme for valuing American exchange options on dividend-paying assets. A numerical example demonstrates the application of the valuation framework. The options approach that incorporates the expansion flexibility option into the analysis results in a higher value than the standard DCF approach, which ignores the value of the option to expand. We also perform sensitivity analyses to see whether the expansion option increases in value in cases of high uncertainty where management can respond flexibly to new market information, and where the investment analysis ignoring flexibility yields a marginally positive net present value. The results of the proposed valuation framework are presented in comparison with a previous model that ignores the opportunity cost of delaying expansion investment.     

一种控制系统串行口驱动程序的实现

控制系统中的通信是设计人员经常需要面对的问题,本文介绍了一种工业控制系统中串行口驱动程序的设计与实现。     

氚水的~3H NMR研究

一、实验部份1.氚水样品用氚水(99.5%,北京化工厂)将比度为70 Ci/ml的氚水分别稀释为5 Ci/ml,10 Ci/ml,14 Ci/ml,20Ci/ml,25 Ci/ml,28 Ci/ml和35 Ci/ml七个样品,并分别装入100μl的微量样品管中,插上聚四氟乙烯支架,然后分别装入直径为5 mm的NMR样品管中,NMR样品管内事先加入CCl_4,高度为3 cm,以避免样品管旋转时微量样品     

一卡通系统数据交换模式初探

本文阐述了一卡通系统与其他系统之间的数据交换模式，并创新性地提出“通用数据交换”模式的概念，供大家探讨和交流。     

PEMFC燃料电池三级电堆的装配分析

以提高PEMFC燃料电池电堆性能为目的,研究了电堆组装过程中加载方式和载荷对电堆接触电阻及电堆性能的影响。利用有限元分析软件ANSYS Workbench对三级电堆的装配过程进行有限元分析。分析了几种不同大小的载荷及不同的加载方式的装配对电堆性能的影响,对比了这几种情况下燃料电池堆的核心部件膜电极(MEA)组件的变形情况及应力分布情况,得出电堆的最佳装配载荷。该结果可为燃料电池电堆的装配提供较好的参考依据。     

Carbon Nanotubes and Nanohorn Hybrid Composite Buckypaper as Microporous Layer for Proton Exchange Membrane Fuel Cell

In the present work, carbon nanotubes (CNT) and CNT‐carbon nanohorns (CNH) (0, 30, 50, 70 and 100 wt.% CNH) composite Buckypapers (BPs) were fabricated using vacuum filtration technique. Structure and property relation of composite BPs were studied using scanning electron microscope, four probe technique, BET surface area and contact angle measurements. Properties such as electrical conductivity, hydrophobic nature and microstructure of CNT‐30 wt.% CNH composite BP are superior to other composite BP. Hence, CNT‐30 wt.% CNH composite BP is chosen as a microporous layer (MPL) for PEMFCs and tested in fuel cell testing fixture. Polarization studies reveal that the cells performance with composite BPs is comparable with SGL‐MPL based cell. Hydrogen pumping and polarization studies of the cells confirms that composite BPs act as a good MPL at anode as well as cathode at 0.4 to 0.8 V. Hence, CNT‐CNH composite BPs are potential candidates for PEMFC applications.