HAP陶瓷合成的研究

本文对生物陶瓷材料－羟基磷灰石的合成进行了研究。试验将激光合成与湿法合成对比分析，着重探讨了在激光辐照下生物陶瓷的形貌，粒度，化学组成和结构等的变化规律，对激光涂敷生物陶瓷涂层有一定的指导意义。     

Composing Cardinal Direction Relations Based on Interval Algebra

Direction relations between extended spatial objects are important commonsense knowledge. Skiadopoulos proposed a formal model for representing direction relations between compound regions (the finite union of simple regions), known as SK-model. It perhaps is currently one of most cognitive plausible models for qualitative direction information, and has attracted interests from artificial intelligence and geographic information system. Originating from Allen first using composition table to process time interval constraints; composing has become the key technique in qualitative spatial reasoning to check the consistency. Due to the massive number of basic directions in SK-model, its composition becomes extraordinary complex. This paper proposed a novel algorithm for the composition. Basing the concepts of smallest rectangular directions and its original directions, it transforms the composition of basic cardinal direction relations into the composition of interval relations corresponding to Allen''s interval algebra. Comparing with existing methods, this algorithm has quite good dimensional extendibility, that is, it can be easily transferred to the tridimensional space with a few modifications.     

基于差分进化算法的智能组卷方法

如何从庞大试题库中自动生成符合教学和考试要求的一套试卷是目前我国利用计算机进行辅助教学的一个重要研究内容.通过分析用户对组卷的要求和试题结构特征.构建了一个智能优化组卷新模型,同时给出了求解的差分进化算法.数值试验结果表明,所给的方法在组卷效率和质量方面具有更好的性能.     

Media Convergence: Creating Content, Questioning Relationships

The development, dissemination, and proliferation of multimedia and media convergent texts raise a number of pressing questions for literacy scholars in general and compositionists in particular. What kinds of literacy practices are students developing through their use and composition of multimodal and new media texts? What genres are used in the creation of such texts, and why? Are there particular genres that are favored? How are older genres remediated or recast through media convergence? What research methodology challenges are posed when attempting to study multimodal and new media texts? How might compositionists use media convergence to teach students about academic literacies, about research, about the changing nature of “writing?” What might media convergence look like in the future? Perhaps most immediately, the phrase itself—“media convergence”—begs a question: what, exactly, is converging? This special issue of Computers and Composition on “Media Convergence” poses answers—sometimes tentative, sometimes provocative—to these questions.     

一种改进的粒子群优化RBF网络学习算法

提出了一种新的用粒子群优化RBF网络学习的算法,即分组训练合成优化。该算法利用粒子之间的合作与竞争以实现对多维复杂空间的高维搜索能力,找出神经网络权值的最优解,以达到优化神经网络学习的目的。通过与用最小二乘法优化的神经网络进行了比较,结果表明算法所优化的神经网络收敛效果明显、收敛速度快。     

工程图档排版系统的设计

针对企业中大量电子图档难以快速排版打印的情况 ,提出了使用计算机自动进行 Auto CAD工程图排版的一种解决方案。该方案采用 Active X技术 ,并利用图纸的标准性 ,实现了在 Auto CAD中对图纸进行优化排版 ,适用于各个版本的 Auto CAD图纸     

CFG刚性桩复合地基的材料构成分析

从CFG桩的材料构成出发，通过试验手段，进行不同材料的不同室内配合比试验，对CFG桩桩体性能进行对比分析，探讨水泥熟料、粉煤灰及矿渣等对CFG桩体材料构成的影响。     

基于遗传算法的智能组卷系统数据库结构的研究

论文在分析了现存的组卷系统的组卷算法及相应的数据库结构的基础上,基于遗传算法提出了一种新的数据库结构,并给定具体结构的确定方法。实践证明,这种结构下的数据库很好地配合遗传算法实现了智能组卷,并且系统效率更高,冗余度更小。     

“Growing Smarter Over Time”: An Emergence Model for Administrating a New Media Writing Studio

This article reports on efforts to create an administrative structure for learning and teaching multimodal composing that depends not on the leadership of a new media writing expert but on the collaboration of relative novices organized according to principles of emergent learning. Based on four years’ experience in a grant-funded program that supports new media composing in multiple disciplines, I report on the benefits of a bottom-up, emergent approach while raising questions about the long-term sustainability of such an approach. I conclude by describing efforts to create more top-down support for new media composing, while remaining committed to serving the teachers and students who are the real agents of change.     

TDICCD像元非均匀性对图像压缩的影响

为了验证星上遥感图像实时非均匀性校正的必要性,对TDICCD像元非均匀性对遥感图像压缩的影响进行了深入研究,并利用FPGA设计了一套实时非均匀性校正系统。首先分析TDICCD像元非均匀性产生原因,以及非均匀性对后续图像压缩影响的原理,并根据星上实际应用的条件,提出了一种保留增益的单点非均匀性校正算法,该方法即保留了2点校正算法适应性强的优点,又克服了星上2个标准源难以实现的缺点。最后进行实验验证,结果表明非均匀性优于1%,并将校正前后的图像分别进行了图像压缩,对压缩效果进行了比对,无损压缩时,像元非均匀性校正后,压缩比提高1.5倍左右;有损压缩时,PSNR提高4 d B以上,表明了星上实时图像压缩的必要性,以及本文系统和算法的可行性。