曲霉胞内多糖的研究

研究获得产胞内多糖的最佳时间为84h，胞内粗多糖的最佳提取条件为：浸提温度90℃，浸提时间3h，浸提次数为2次，破壁时间12min。采用sevage和三氯三氟乙烷（CFC—113）法结合去蛋白的效果很好。采用Sephadex G75分离纯化曲霉多糖，获得2种胞内多糖（IPSⅠ和IPSⅡ）。纸层析和凝胶柱层析结果显示IPSⅠ和IPSⅡ均为纯物质。采用薄层层析法，分析这2种多糖组分均可能有甘露糖、葡萄糖和鼠李糖，采用红外光谱对这2种多糖进行了初步的结构鉴定，发现这2种多糖在结构上略有差异。     

利用PDMS纳米结构薄膜增强玻璃基板出光

以纳米压印技术为基础制备了具有纳米结构的聚二甲基硅氧烷(PDMS)薄膜.将纳米结构中间聚合物模板(IPS)薄膜覆盖在有PDMS溶液的玻璃基板上,真空加热后在玻璃基板上得到PDMS网格结构薄膜.这种方式得到的网格结构形状保持较好且厚度均匀无气泡,IPS薄膜不仅可以反复使用以减少Si母版的材料损耗,还可以缩短网格结构的制备...     

防火墙与网络入侵防御系统集成实施方案

本文分析了Linux防火墙实现方法和网络入侵防御系统的原理,提出了一种防火墙与网络入侵防御系统集成实施的方案,并分析了入侵防御系统实现中的数据来源、检测方法和改进的响应方式。     

基于Snort入侵检测与防御系统的优化策略

本文对高校部署的入侵检测和防御系统性能瓶颈进行分析,阐述了解决性能瓶颈的优化策略,为提高高校在网络安全系统的性能提出了改进方法．     

基于Linux的网络入侵防御系统的研究和设计

基于特征的入侵防御系统是目前的入侵防御技术的主流。分析研究Snort入侵检测系统和Netfilter防火墙的工作原理,对如何保障自身安全以及联动的方式进行探讨,利用插件技术、多线程技术设计编写相关协同模块,提出一种基于Snort和Netfilter的分布式入侵防御系统;针对Netfilter防火墙规则集的顺序敏感性的工作特点,对其规则的编写进行具体优化,提高系统工作效率。经过测试证明,该系统灵活高效,能够利用入侵检测系统的检测能力,动态地为防火墙定制过滤规则,阻断攻击源,从而达到入侵防御的目的。     

实例研究:使用防火墙,IDS,IPS构建企业级安全系统

本文简要介绍了目前三种主要的安全技术：防火墙,入侵检测系统以及入侵防御系统,并分析其优缺点。通过一个实例说明了如何采用分层防御技术将这3种技术结合在一起,取长补短,构建安全的防御系统。且充分考虑了成本因素,在不降低系统性能的前提下尽可能地使用免费的资源打造安全的系统,并演示了如何利用免费的工具测试入侵防御系统性能的方法,具有很大的实用价值。     

Reliability evaluation for an intermittent production system with stochastic number of normal machines

In an intermittent production system (IPS), a number of normal machines in a workstation may present multiple levels owing to maintenance, possibility of failure, etc. It means that the number of machines in each workstation is stochastic. This paper proposes a key performance index (KPI), which reflects the probability that an IPS can complete demand d within time constraint T. Such a probability is defined as system reliability. The IPS is modeled as a stochastic network, in which each arc is regarded as a workstation with stochastic number of normal machines, and each node is represented as a buffer. The concept of minimal machine vector (MMV), which indicates the minimal capacity required at each workstation to satisfy the demand and time constraints, is presented for evaluating the system reliability. In particular, a novel algorithm based on depth-first search is proposed to derive all MMVs. This algorithm avoids searching for unnecessary child nodes, and thus increases efficiency. Two practical examples, a printed circuit board and a footwear manufacturing systems, are used to illustrate the proposed algorithm. Such a KPI can provide information to production managers to understand the probability that an order can be completed on time.     

Ultra‐narrow border display with a cover glass using liquid crystal displays with a polyimide substrate

Plastic liquid crystal displays (LCDs) termed sheet LCDs with transparent polyimide (PI) substrates were constructed. There is a lot of potential to expand the use of these LCDs in LCD applications. Herein, we investigated a structure for sheet LCDs such as high‐density main post spacers (PSs) and PI substrates with the aid of a barrier layer to control the residual stress and protect the liquid crystal from moisture. Drawing on this, we propose an ultra‐narrow border LCD that makes of the developed sheet LCDs. The most significant improvement is that the four borders of the LCD can be folded to wrap the backlight unit. This LCD was based on various new techniques, including the use of plastic substrates, processing of polarizer films, control of the neutral surface of a bending component based on the sealant width, and the use of a cover glass with a lens effect. We believe that these novel LCDs will be useful in numerous new applications.     

共面转换型42英寸液晶电视的发展

我们通过使用超级共面转换(SuperIn-Plane-Switching)模式和过驱动(Over-Driving)电路技术,开发出具有宽视角和快速响应的42英寸(1280×768,159)大尺寸液晶电视(LCD-TV)。通过使用膜超级共面转换技术获得了在任意方向的宽视角,通过优化液晶材料和液晶盒的设计,获得了更快的响应时间(12ms)。     

舰船综合电力系统继电保护策略

综合电力系统(Integrated Power System,IPS)作为未来舰船发展的重要组成部分,代表着先进的集成优化电力系统发展方向。为深入研究IPS中配电网保护策略,叙述了近年来IPS国内外发展情况,较全面的分析了IPS中配电网络的特点,结合几种常用母线继电保护措施在IPS中的应用情况,指出了保护实现的难点和关键;综述了IPS交流网络中单相接地故障的探测与诊断方法和陆地中性点不接地系统中单相接地故障的研究方法。最后,指出IPS配电网络的未来发展方向,讨论了IPS中压直流配电网的相应保护策略发展的方向。