具有媒体饱和发生率的SIS时滞模型研究

为了研究媒体报道对传染病动力学性态的影响,通过建立疾病发生率受媒体报道影响的SIS数学模型,确定模型的基本再生数,证明平衡点的存在性以及地方病平衡点的唯一性,并证明无病平衡点的局部渐近稳定性和全局稳定性,以及地方病平衡点的局部渐近稳定性。引入时滞因子对模型进行深入研究,通过数值模拟验证了理论结果的正确性。研究结果表明:当参数满足一定条件时,在地方病平衡点会产生Hopf分支。具有媒体饱和发生率的SIS时滞模型的研究结果,阐释了媒体报道对疾病传播的影响,丰富了饱和发生率的传染病模型结果,为有效实施疾病防控提供了理论依据。     

从光色的物理性研究到艺术色彩设计应用

着重揭示光色的内在规律,以及来自于自然的色彩内在结构,传递着形成色彩关系的基本规律和调和规律,为人们提供色彩设计的语素,启示着色彩设计构思的灵感,是设计师进行色彩设计的有力工具,因而成为我们自觉地认识色彩和创造色彩的有效手段。     

Similar or contrastive? Impact of product–background color combination on consumers' product evaluations

Based on arousal theory, this study explores the impact of product–background color combination on consumers' product evaluations through four empirical analysis. As predicted, the interaction of product–background color combinations and product types has a significant influence on consumers' product evaluations. For functional products, the product–background similar color combination can cause consumers' higher product evaluations. However, for sensory-social products, the product–background contrastive color combination can cause consumers' higher product evaluations. Moreover, the arousal level mediates the interaction effect of product–background color combinations and product types on consumers' evaluations. This research also demonstrates that only when the product color matches product type, the interaction of product–background color combinations and product types can improve consumers' product evaluations through increasing (decreasing) the arousal level, however, the interaction effect is no longer significant when the matching degree of product color and product type is low. We contribute to the visual marketing research by providing new insights and useful implications for using color clues to present products in marketing practice.     

What should we call this color? The influence of color-naming on consumers' attitude toward the product

Many companies use unique color names to differentiate products, attract consumer attention, and promote sales. This study categorizes the names of colors in detail, and uses schema incongruity and affect regulation theory to elucidate the effects of color names with different typicality and ambiguity. We identify the underlying mechanism and explore how color attribute importance and color name valence moderate the effects of the color name. The results of five studies show the following: (a) atypical-low ambiguity color names (vs. atypical-high ambiguity and typical color names) create a more favorable consumer attitude toward the product; (b) when color is the primary attribute of the product, typical color names are more effective; when color is a secondary attribute, atypical color names yield more favorable effects; (c) for positively-valenced color names, an atypical-low ambiguity naming method yields a better response, while for negatively-valenced color names, an atypical-high ambiguity naming method yields a more favorable response; and (d) the color-naming effects are mediated by perceived product uniqueness or playfulness, depending on different conditions.     

从鲁迅作品看中西色彩词的差异与翻译转换

由鲁迅作品可见,中英色彩词的使用存有很大的文化差异,译者在色彩词的翻译转换中应采取灵活的翻译策略,激发读者产生如原作一样栩栩如生的意象,获得同样的审美体验。     

基于图像块复杂度和分段距离函数的人眼定位算法研究

针对有复杂背景的人脸中眼睛定位问题,本文采用肤色分割原理分离出背景信息,在人眼检测过程中采用寻找最大图像块复杂度的小块的方法,在人眼定位过程中采用计算分段距离函数的方法。本文精选了200张单人照片进行仿真实验,实验结果表明,上述解决方案可以从有干扰背景,人头侧向一方,甚至戴眼镜和帽子等饰物的图像中快速精确地识别出人脸和人眼。     

一类大型非线性前馈系统的分散镇定

文章运用互联系统有界性、稳定性判据以及自下而上的迭代分析方法,将设计任务转化为镇定上层各子系统的标称部分及镇定底层子系统,明确构造简单饱和控制律,并给出证明方法有效性的仿真例子。     

信息图表设计中的色彩运用

信息图表设计中的色彩起着先声夺人的作用,不仅带给读者丰富的视觉享受,而且能快速有效传递文字语言所不及的信息。文章针对信息图表设计中色彩的作用,借鉴大自然色彩信息传递方式,即色彩统一和色彩对比之方式进行分析,结合具体实例探讨在信息图表设计中如何有效运用色彩进行信息传递。     

Destination Image Saturation

Offering travel information sources to potential tourists can be expensive, although the importance of the amount and variety of travel information sources has been stressed in many studies. Therefore, it would be useful to examine how much exposure to travel information would lead to optimal results. Effects of exposure time to travel information on destination image were examined in this study. Two hypotheses were suggested to account for the relationships between exposure time to travel information and destination image. Specifically, the first hypothesis was related to a linear trend, while the second one was related to a quadratic trend in the conceptual relationships. A posttest-only control group design was used, and 312 undergraduate students were recruited at six colleges. Multivariate analysis of variance and a series of quadratic regression analyses were used to test the two hypotheses. Results demonstrated that there were both linear and quadratic trends in the relationships between exposure time to travel information and destination image. Findings also provided empirical evidence for a saturation effect on perceived destination image formation. Therefore, an optimum level between information exposure and perceptions was suggested.     

Skin color shades in advertising to ethnic audiences: The case of African Americans

Two experimental studies were conducted to examine African Americans' (AA) perceptions and attitudes toward light-skinned and dark-skinned AA female models in print advertisements. Using convenience student samples from three universities in the southeastern USA, the first study examined the perceptions and attitudes of 299 AA males toward the advertising stimuli, while the second study explored the perceptions and attitudes of 251 AA females to the same stimuli. In Study 1, consistent with marketplace, evolutionary and reinforcement theories, AA males evaluated light-skinned AA female models higher on physical attractiveness and more favorably on ad- and brand-based evaluations than dark-skinned AA female models. The exploratory results of Study 2 found that AA females evaluated dark-skinned AA female models higher on physical attractiveness than light-skinned AA female models, but no significant differences on ad- and brand-based evaluations were reported. The authors discuss the findings, limitations and directions for future research.