共查询到20条相似文献，搜索用时 187 毫秒
1.
《科技通报》2015,(10)
通过对园林建筑的光环境构建和色彩的敏感度表征,提高园林建筑层次设计水平,降低园林建筑的色彩光污染对人体的刺激和伤害。传统的园林建筑色敏感度分析方法采用盲区稀疏修正方法,对色差敏感度表征不准确,园林建筑层次设计效果不好。提出一种基于层次视觉偏移修正的园林建筑设计色差敏感度分析方法。进行建筑层次设计的设计标准和评价模型进行描述,得到园林建筑色差敏感度序列子空间特征信息纹理和结构两部分的特征,然后采用特征分析方法对园林建筑层次设计中的色差敏感度进行数学建模,采用层次视觉偏移修正方法,进行色差敏感度分析,求得层次视觉偏移修正点,实现算法改进。实验结果表明,采用该方法能有效实现对园林建筑的色差数采集,提高色差敏感度分析的准确性,在建筑设计中具有较高的应用价值。 相似文献
2.
采用BP神经网络模型,主要从视觉感官和火灾中的火焰形态学特征两点入手,在图像特征的基础上研究火灾探测和自动灭火技术,从而达到将理论变为实际,通过软件实现方案中的算法,设计出一套完整的火灾探测和自动灭火系统的目的。 相似文献
3.
4.
5.
彩色图像检索方法基于HSV颜色模型提取示例图像的颜色特征与图像库中图像的颜色特征时,提取不同维数的特征向量。在图像相似性度量的时候使用不同的计算公式。实验结果证明,这种颜色直方图算法速度快且与人类的视觉有着良好的一致性。 相似文献
6.
7.
在城市筑群空间分布模式中,需要对建筑区的三维影像特征进行数据提取,用遥感影像中包含的光谱特征和纹理特征,实现对建筑物的特征融合检测。传统方法采用高亮线条和阴影区域融合的方法实现对建筑区的三维影像数据提取,当图像本身受斑点噪声影响较大和光程较远的情况下,影像数据提取效果不好。提出一种基于形状特征与纹理分区相融合的建筑区三维影像数据提取方法,采用骨架线模式和三角网模式构建建筑物的三维纹理模型,设计基于纹理分区的建筑区三维影像图像分割算法。在三角网纹理分区结构模型的基础上,通过相互近似正交的直线模式建立建筑群直线模式的方向关系图,实现对建筑区的三维影像数据提取。仿真实验表明,采用该模型对建筑区的三维影像数据提取,影像分割准确,能准确有效提取影像局部区域的亮度特征,受斑点噪声影响较大和光程的影响较小,对建筑区图像特征的检测正确率较高。 相似文献
8.
在网络对抗中同时存在多种注入性入侵的情况下,需要及时准确地检测出入侵的恶意程序。传统的检测方法需要提取数据库中所有恶意程序样本特征参数进行比对,由于外部注入的恶意程序的与传统入侵特征不同,伪装水平较高,使得恶意程序特征与正常程序特征难以分别,检测结果准确性降低,导致军事网络安全受到严重威胁。为此,提出一种基于特征优化算法的外部多网络对抗中注入性入侵检测方法。根据主要特征分析方法,能够得到注入性入侵恶意程序的主要特征,利用注入性入侵特征映射条件,能够得到注入性入侵的检测模型,实现了网络对抗中注入性入侵的检测。实验结果表明,利用该算法能够准确的检测出网络对抗中注入性入侵的恶意程序,效果令人满意。 相似文献
9.
《科技通报》2015,(8)
在建立夜间建筑景观色彩调节的舒适度适应模型过程中,容易忽略人眼立体视觉注意力机制,导致传统的舒适度适应模型由于不符合人眼的立体视觉注意力机制,无法有效建立夜间建筑景观色彩调节的舒适度适应模型,提出一种基于立体视觉技术的夜间建筑景观色彩调节的舒适度适应模型,分析了静态视觉显著特征和夜间建筑景观立体图像的视差,求出静态显著图和深度显著图,将其结合成立体显著图,为夜间建筑景观色彩调节舒适度适应模型提供可靠依据。在立体显著图的基础上对夜间建筑景观色彩特征矢量进行采集,随机选取夜间建筑景观图像集合中若干对立体图像组成训练样本数据集合,通过支持向量回归完成训练样本数据集合的训练,获取最佳权重矢量以及最佳偏置量,得到最佳支持向量回归训练模型,从而实现夜间建筑景观立体图像舒适度适应模型的建立。仿真实验结果表明,所提模型具有很高的准确性。 相似文献
10.
针对基于区域的图像检索技术中在构造显著区域时忽略人眼视觉的影响而造成的检索率偏低问题,提出了一种新的图像检索算法.首先,引入人眼的视觉特性,提取图像的一些有意义的点特征,构造显著区域,在此基础上,定义图像的特征描述符,以描述符为线索,将图像的形状特征和空间颜色分布特征有机进行结合,不仅克服了基于目标区域检索时的缺点,而且降低了传统目标区域提取算法的复杂度.实验结果表明,该算法具有较高的检索效率. 相似文献
11.
A research group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol-a chemical found in the skins of red grapes in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said. 相似文献
12.
Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
13.
A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
14.
Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
15.
《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
16.
Active biological molecules functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery disease diagnosis therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction. 相似文献
17.
《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
18.
Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
19.
Leah A. Lievrouw 《The Information Society》2000,16(2):155-159
This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment. 相似文献
20.
Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献