基于BIM的可视化建筑运维系统构建研究

随着BIM技术的推广普及,三维信息模型在建筑全生命周期中的应用渐成关注的热点。深入剖析BIM可视化建筑运维系统的应用前景,并系统地探讨其运行模式基本架构与主要功能。借助项目案例,以实现构件体块与参数信息之间的"剥离"和"链合"为核心技术,完整地展现从BIM竣工模型到可视化运维系统的实现技术路线,为智能化建筑运维管理系统的构建与应用提供可靠的依据。     

流变混凝土骨料运动模拟试验研究

用卡波姆凝胶配制与流变混凝土浆体流变性能等效的透明浆体,通过可视化物模试验模拟得到流变混凝土骨料的运动规律.基于真实与模拟介质流动图像、振动骨料分布实时一致性原则,分析了拌和物流动过程形变、振动骨料沉降特点及其形成机理.结果表明:流变混凝土基于等效流变性能的可视化模拟方法独特可行,可直观获取骨料沉降运动规律以及速度场、位移场等运动形态参数,为进一步研究流变混凝土的本构关系及颗粒接触模型提供基础.     

基于视知觉的小学建筑色彩设计研究

该文从视知觉的角度出发,通过对儿童的色彩心理进行分析,总结不同色彩在小学建筑中的具体应用,提出小学建筑色彩的设计原则,为以后小学建筑在色彩方面的设计提供一些新思路与方向,使其能更适应于当前素质教育的要求。     

多种BIM软件在建筑设计中的综合应用

在应用BIM技术进行建筑设计的过程中,需要多种BIM软件的配合才能实现预期的目标。文章分析了BIM软件在设计过程中的优势与缺陷,对多种BIM软件与3D建模软件在设计过程中的配合应用作出介绍,着重介绍了BIM软件在概念体量设计、参数化设计、可视化表现等方面的应用。     

Eye-tracking Analysis in Landscape Perception Research: Influence of Photograph Properties and Landscape Characteristics

Abstract

The European Landscape Convention emphasises the need for public participation in landscape planning and management. This demands understanding of how people perceive and observe landscapes. This can objectively be measured using eye tracking, a system recording eye movements and fixations while observing images. In this study, 23 participants were asked to observe 90 landscape photographs, representing 18 landscape character types in Flanders (Belgium) differing in degree of openness and heterogeneity. For each landscape, five types of photographs were shown, varying in view angle. This experiment design allowed testing the effect of the landscape characteristics and photograph types on the observation pattern, measured by Eye-tracking Metrics (ETM). The results show that panoramic and detail photographs are observed differently than the other types. The degree of openness and heterogeneity also seems to exert a significant influence on the observation of the landscape.     

基于视觉显著模型的音视频交叉水印算法

提出一种基于Itti视觉显著模型的音视频交叉水印算法.首先利用音频码流的低通幅值特性生成水印,并嵌入到视频码流中;其次解码视频码流的关键帧Ⅰ帧,获取YUV序列上的亮度(Y)分量,并对其进行显著性分析;最后分块对非显著区域进行DCT变换,并通过量化索引调制嵌入水印.实验结果表明,该算法将嵌入水印后的关键帧平均PSRN值提高了1.678 5 dB,缓解了水印不可见性和鲁棒性的矛盾,实现了音视频码流之间的交叉保护.     

Assessing landscape preferences: a visual choice experiment in the agricultural region of Märkische Schweiz,Germany

Natural amenities and the aesthetic value of agricultural landscapes are important territorial assets for improving rural tourism and the quality of the living environment. To identify which characteristics shape the visual quality of a landscape, a stated-preference survey was conducted (N = 200) using photorealistic landscape visualisations of four different landscape attributes (point green elements, linear green elements, crop diversity and presence of livestock). We estimated respondents’ preferences for landscape attributes, examined the extent of agreement among respondents and identified socio-economic factors influencing their responses. Results revealed that point elements had the highest general preference. About 70% of respondents preferred diverse and highly structured landscapes, while about 30% of respondents had opposing preferences. Preferences were also found to be dependent on the individual’s sociocultural background, such as their level of education, gender or age. These results can help to improve the multi-objective targeting of policies by including an aesthetic value perspective.     

落叶松结构用规格材分级研究

选取截面尺寸为40mm×90mm的兴安落叶松规格材为研究对象,参照GB 50005—2003对规格材进行目测分级及足尺弯曲测试,依据足尺弯曲性质设定落叶松规格材机械分级的等级边界条件,并对规格材进行机械分级.结果表明：目测分级中高等级规格材（Ⅰc~Ⅲc）的比例相对较高,落叶松规格材的主要降等缺陷为节子、轮裂/干裂和腐朽;以弹性模量为界限指标,可以将落叶松规格材划分为M14,M30和M40这3个强度等级;落叶松规格材等级强度从大到小的排列顺序为：M40,Ⅰc,M30,Ⅲc,Ⅱc,M14;机械分级后的规格材其强度性质更加稳定,规格材的价值得到明显提高.综合比较,中国商品林落叶松规格材更适合机械分级.     

视觉心理学在住宅室内设计中的应用浅谈

随着我国经济建设的快速发展,人们自身审美观点和欣赏能力也在逐步提高。房屋的设计已经不仅仅满足于可以居住的标准,更多的则是想要将自己偏爱的风景或者动物等形象融入其中,以获取视觉冲击的效果。     

CASS 软件在交叉口竖向设计高程放样中的运用

针对道路交叉口竖向设计施工放样网格点高程手工获取过程烦琐、效率及精度低下、容易出错等问题,在目前较为流行的地形地籍成图软件南方CASS环境中,利用Visual LISP语言编程进行二次开发,调用CASS 软件“查询指定点高程”的命令,实现了交叉口竖向设计施工放样网格点高程值的快速计算,达到了化繁为简、降低工作强度的目的,提高了获取数据的精度和效率。