基于分形扫描的高灰度平板显示的硬件实现

本文将分形算法应用于2048级高灰度平板显示的扫描映射,使用平板显示系统灰度图像的最优扫描结构及分形模型,以解决平板显示系统扫描形成灰度图像过程中的时间冗余问题。由分形扫描核心模块,得到了相应的每个扫描时间对应的子空间码和位码序列进行扫描,然后通过检测模块验证了2048级高灰度分形扫描方法的准确性,最终由硬件系统验证了2048级高灰度分形扫描的可实现性。     

提高计算机软件课程教学效果的思考

在信息技术时代的今天,伴随着计算机技术的迅猛发展以及在日常生活和工作中的普及,我们如何掌握常用的计算机应用软件成为每个人工作学习中不可缺少的课程。在该课程的教学过程中,教师应选择合适的版本,以培养学生的动手能力、自学能力和创新意识为出发点,综合运用实例教学法、任务驱动教学法等方法,同时给学生创造一个自主的学习环境,并建立灵活的评价体系,以增强教学效果。     

有效的IPSec安全策略管理方案*

针对IPSec协议在安全策略管理存在的问题,引入信任管理的思想,介绍了一种基于信任管理的IPSec安全策略管理方案。该方案对分布式网络中的策略可以进行统一的描述,并通过一致性证明能够实现策略的委托授权管理,这样大大提高了IPSec安全策略管理效率和IPSec的灵活性。     

岗位体验式教学法在雷达装备实践教学中的应用

针对雷达装备实践教学中演示式教学法对于学员能力的拓展和装备的综合运用等方面存在的问题,将岗位体验式教学法运用于雷达装备实践教学中.首先分析岗位体验式教学法的基本内涵;然后提出前期准备、场景设置、教学实施、交流研讨和总结讲评等5个方面的具体实施方法,进行实例分析;最后给出岗位体验式教学法的实施效果.教学实践结果验证了该方法的有效性.     

NIT-Ph-p-BEN氮氧自由基的制备及催化降解性

以对醛基苯甲酸为原料，通过醛酸与2,3-二甲基-2,3-二羟胺基丁烷缩合，再经NaIO4氧化最终制得4-(4,4,5,5-四甲基-1,3-二氧化物)咪唑基-1-苯甲酸（NIT-Ph-p-BEN氮氧自由基）。采用FTIR、UV、ERP（电子顺磁共振波谱仪）和元素分析等对其结构进行表征；通过催化降解废水中有机染料甲基橙、甲基蓝和罗丹明B对其催化活性进行了评估。结果表明，当甲基橙、甲基蓝和罗丹明B浓度为15 mg/L，NIT-Ph-p-BEN质量浓度为0.15 g/L，H2O2浓度为30 mmol/L时，NIT-Ph-p-BEN对甲基橙有更好的催化降解性，仅在1 h内甲基橙的降解率达到94.26%。此外，反应机理表明，H2O2有助于实现NIT-Ph-p-BEN自由基的再生和循环利用。     

Software rejuvenation in cluster computing systems with dependency between nodes

Software rejuvenation is a preventive and proactive fault management technique that is particularly useful for counteracting the phenomenon of software aging, aimed at cleaning up the system internal state to prevent the occurrence of future failure. The increasing interest in combing software rejuvenation with cluster systems has given rise to a prolific research activity in recent years. However, so far there have been few reports on the dependency between nodes in cluster systems when software rejuvenation is applied. This paper investigates the software rejuvenation policy for cluster computing systems with dependency between nodes, and reconstructs an stochastic reward net model of the software rejuvenation in such cluster systems. Simulation experiments and results reveal that the software rejuvenation strategy can decrease the failure rate and increase the availability of the cluster system. It also shows that the dependency between nodes affects software rejuvenation policy. Based on the theoretic analysis of the software rejuvenation model, a prototype is implemented on the Smart Platform cluster computing system. Performance measurement is carried out on this prototype, and experimental results reveal that software rejuvenation can effectively prevent systems from entering into disabled states, and thereby improving the ability of software fault-tolerance and the availability of cluster computing systems.     

An experimental investigation of mixing of carbon nanotube/polymer composite in a batch-type screw mixer

We develop a miniaturized batch-type screw mixer (BSM) for uniform mixing of polymer resin and nanoparticles, based on the stretching of material elements. This stretching is induced by the combination of recirculating cross-sectional flows in deep channels of the screw and high shear stress developed at flight regions. The BSM is used to produce a polymer nano-composite composed of multi-walled carbon nanotubes and polydimethylsiloxane resin. The mixing performance of the BSM is characterized quantitatively by estimating two different types of mixing efficiencies (i.e., dispersive mixing and distributive mixing) via transmitted light microscope images. The developed BSM highly improves the mixing performance rather than that of a conventional ultrasonic mixing device.     

Analyses of flavor qualities of vegetable oils by gas chromatography

Soybean oil, hydrogenated soybean oil, and corn oil were exposed to fluorescent light for different periods of time to obtain a wide range of flavor qualities. The flavor qualities of these oils were evaluated by sensory and gas Chromatographic methods. Sensory evaluation was conducted using a 10-point hedonic scale to rate overall flavor quality. The sensory panel was made up of 94 members from 8 different laboratories. The correlation coefficients (r) of the flavor scores between sensory evaluation and instrumental analysis for soybean oil, hydrogenated soybean oil, and corn oil were 0.95, 0.97 and 0.97, respectively. These results were very close to the correlation coefficients (r) 0.99, 0.98 and 0.95 obtained from 10 sensory panel members from one specific laboratory.     

A method for transformation of engineering bill of materials to maintenance bill of materials

In order to solve the transformation problem of Bill of Materials (BOM) from engineering BOM to maintenance BOM for Maintenance, Repair and Overhaul (MRO) systems, a formal transformation model of BOM view is proposed. In this model, the intermediate component, inherited component, virtual component are defined in the specific maintenance management domain, and the transformation process from engineering BOM to maintenance BOM is discussed through feature recognition methods and rules. The proposed transformation model has been developed and deployed in an MRO system for a steel manufacturing enterprise.