颜色空间变换及其在印刷中的应用

提出一种基于人工神经网络的LAB—CMYK颜色空间变换方法:在原稿三原色(RGB)图像中选取N个像素点,转换到LAB空间,由印刷分版机对原图进行黄(Y)、品红(M)、青(C)、黑(K)4色分版,得到N个像素点对应的黄、品红、青、黑值,建立训练样本集,应用人工神经网络建立LAB—CMYK颜色空间的映射关系。     

Is there the potential for an epidemic of variant Creutzfeldt–Jakob disease via blood transfusion in the UK?

The discovery of three individuals suspected to have contracted variant Creutzfeldt-Jakob disease (vCJD) through blood transfusions has heightened concerns that a secondary epidemic via human-to-human transmission could occur in the UK. The Department of Health responded immediately to this threat by banning those who had received blood transfusions since 1980 from donating blood. In this paper, we conduct a sensitivity analysis to explore the potential size of a blood-borne vCJD epidemic and investigate the effectiveness of public health interventions. A mathematical model was developed together with an expression for the basic reproduction number (R0). The sensitivity of model predictions to unknown parameters determining the transmission of vCJD via infected blood was assessed under pessimistic modelling assumptions. We found that the size of the epidemic (up until 2080) was bounded above by 900 cases, with self-sustaining epidemics (R0>1) also possible; but the scenarios under which such epidemics could arise were found to be biologically implausible. Under optimistic assumptions, public health interventions reduced the upper bound to 250 and further still when only biologically plausible scenarios were considered. Our results support the belief that scenarios leading to large or self-sustaining epidemics are possible but unlikely, and that public health interventions were effective.     

Colour and tolerance of preferred skin colours on digital photographic images

Skin‐tone has been an active research subject in photographic colour reproduction. There is a consistent conclusion that preferred skin colours are different from actual skin colours. However, preferred skin colours found from different studies are somewhat different. To have a solid understanding of skin colour preference of digital photographic images, psychophysical experiments were conducted to determine a preferred skin colour region and to study inter‐observer variation and tolerance of preferred skin colours. In the first experiment, a preferred skin colour region is searched on the entire skin colour region. A set of nine predetermined colour centers uniformly sampled within the skin colour ellipse in CIELAB a*b* diagram is used to morph skin colours of test images. Preferred skin colour centers are found through the experiment. In a second experiment, a twice denser sampling of nine skin colour centers around the preferred skin colour center determined in the first experiment are generated to repeat the experiment using a different set of test images and judged by a different panel of observers. The results from both experiments are compared and final preferred skin colour centers are obtained. Variations and hue and chroma tolerances of the observer skin colour preference are also analysed. © 2011 Wiley Periodicals, Inc. Col Res Appl, 2013     

含偶氮苯单元光响应多肽的研究进展

综述了含偶氮苯光色性单元的多肽光响应效应，主要包括光诱导的无规线团与右手α-螺旋之间的转变；左、右手-α-螺旋的反转；光激发的聚集-解聚过程以及由多肽形成的单层膜光力学效应。这些效应表明光响应多肽是一类很有前景的光响应化合物，可作为设计光调节传感器等光响应装置的合适材料。     

应用于显示器件的动态肤色校正方法

基于输入图像中需要调整的肤色区域动态地移向特征肤色区域的图像动态肤色校正方法,提出了一种适用于显示器件中硬件实现的动态肤色校正简化模型,进而设计实现了实时动态肤色校正电路,并将其应用于100 cm彩色交流等离子体显示器(AC PDP)中进行验证。仿真及实验结果表明,本文提出的实时动态肤色校正方法能够使得校正后的输出图像中皮肤颜色显得更加自然生动,更趋近于人们对肤色的先验理解,从而有效地提高了AC PDP的彩色再现能力。     

多元感知与多元描绘

自从电影问世以后,"复制"现实就成为人类现代文明的一大特征。计算机和互联网技术的出现更把"整体"复制渗透到人们生活的方方面面。这种无限次复制的现象被称为当代的"多元化感知"。明星建筑师库哈斯利用这种"多元感知"对自己设计的波尔多住宅进行了"多元描绘",揭示了一座普通住屋背后不易被觉察的空间细节和行为情节,启示我们应当积极探索建筑和新媒体以及新的表达方式之间的关系。     

柔性版制版研究

柔性版印刷在世界范围内得到快速的发展,被越来越多的印刷界人士所接受,并在印刷中占据越来越重要的地位。它已被列为当今四大印刷方式之一。在印刷比较发达的国家,柔性版印刷技术已经十分成熟。从设备的制造、版材的开发、再到印前制版及上机印刷,每个环节都有一个良好的系统标准,这也是国外柔性版印刷发展较我国快速的主要原因。而在我国,柔性版印刷还缺少一套系统的规划。就柔性版制版中的曝光时间与所选用版材间的参数确定就需要做一系统的研究。本文就是通过研究不同制版时间对版材的底基厚度、网点还原、阴线深度、表面结构等的影响,详细阐述了华光3.94mm柔性版制版参数的建立,考察了版材的曝光曲线。结果表明,华光3.94mm柔性版制版曝光宽容度大,网点还原性良好,能够满足使用要求。     

基于OpenGL三维飞行模拟的实现

实现操作面、起落架的运动能够真实的模拟飞机飞行过程。利用3DSMAX软件构建民机的各个部件的三维模型,并将其直接导入到OpenGL中。针对动画效果的逼真性,通过使用OpenGL建立地形和天空的三维模型,在实现地形时运用了颜色缓冲器、深度缓冲器,在绘制天空时运用了纹理贴图技术。使用鼠标按键输入操作实现画面的放大缩小可以更加清楚的了解操作面的状态。在此基础上调用飞参数据和使用双缓冲技术实现了飞机的三维飞行模拟。     

修改化精细玻璃艺术品复制新工艺

介绍了感光成像新工艺的特点、使用范围及所需的设备与材料，着重介绍了个性化、高精度彩色玻璃复制工艺流程，并就UV特殊效果油墨的选择、印刷与固化进行了讨论。     

Relationships among milk yield,body condition,cow weight,and reproduction in spring-calved Holstein-Friesians

Relationships among milk production, body condition score (BCS), body weight (BW), and reproduction were studied using logistic regression on data from 6433 spring-calving Holstein-Friesian dairy cows in 74 commercial herds. Multivariate models were adjusted for herd, breeding value for milk yield, proportion of Holstein-Friesian genes, lactation number, calving period, and degree of calving assistance. Significant associations between reproductive measures and components of energy balance were identified. Higher 200-d milk protein content and higher protein-to-fat ratio at start of breeding were associated with increased likelihood of submission for breeding in the first 21 d of the breeding season (SR21). High 100-d cumulative milk yield as a proportion of estimated 305-d milk yield (low persistency) was associated with a lower likelihood of pregnancy to first service (PREG1), whereas cows reaching peak milk yields earlier tended to have higher PREG1. Cows that reached nadir milk protein content relatively late in lactation had lower PREG1. Milk yield at first service and 305-d milk protein content were positively associated with the likelihood of pregnancy after 42 d of breeding (PR42). Higher 305-d milk lactose content was associated with increased PREG1 and PR42. Mean BCS at 60 to 100 d of lactation was positively associated with both SR21 and PR42, whereas nadir BCS was positively associated with PREG1. Cows with precalving BCS > 3.0 that also lost > 0.5 BCS unit by first service had lower PR42. More BW gain for 90 d after start of breeding was associated with higher SR21 and PREG1; more BW gain for 90 d after first service was associated with higher PR42. Milk protein and lactose content, BCS, and BW changes are important tools to identify cows at risk of poor reproduction.