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目前对于大坝变形的预测都是基于单一的预测模型,该模型无法同时考虑样本数据量及影响因子优选情况,而灰色模型适用于短期的预测,并能够很好的确定影响因子,而支持向量机适用于长期的预测,无法确定最佳的影响因子。本文将支持向量机和灰色模型进行很好的结合,可以达到模型互补的目的,提高影响因子的优化及训练样本的拟合和预测样本的预测精度。 相似文献
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《中国科技信息》2020,(Z1)
随着电网逐步智能化,电力通信网承载的业务系统不断扩大升级,传统的网络流量模型己无法很好的拟合现有的网络流量,建立基于海量数据的电力通信网络流量预测模型具有重要意义。针对电力通信网网络业务流量所呈现的随机性和波动性特点,提出了一种基于长短时记忆(LSTM)和支持向量回归(SVR)的新型混合预测模型以提高短期网络流量预测的准确性。该模型首先采用变分模态分解(VMD)提取流量序列的固有模态,降低噪声的随机性影响,然后采用LSTM分别对各本征模态进行拟合,充分挖掘流量序列在时间上的分布特征,最后考虑流量影响因素,采用SVR拟合残差余量,并将所有子预测模型进行叠加整合。该模型使用实际数据为研究对象进行仿真预测,结果表明,该模型可有效提高模型的预测精度。 相似文献
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高耸建筑不均匀沉降变形直接影响建筑物的施工进度和安全性评价。以预测高耸建筑沉降变形量为目的,考虑到建筑物沉降监测非等时间隔的特点,以相邻观测时间间隔为权,直接生成1-WAGO序列,建立灰色系统非等间隔GM（1,1）模型,并将该模型应用于某大厦的沉降量预测分析中。由后验差检验结果、模拟预测分析说明,该模型所预测的沉降量结果正确可靠、精度高。 相似文献
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建立了基于遗传算法的大坝变形监测人工神经网络模型,并将模型应用于大坝纵向水平位移观测数据分析和预测,取得了良好的拟合效果和预测精度。为了比较GA—BP监测模型的优劣,利用BP人工神经网络模型对大坝纵向水平位移进行了分析,通过对比拟合结果和误差,得出了利用遗传算法优化大坝变形监测人工神经网络模型可以提高拟合效果和减小误差的结论。 相似文献
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《科技通报》2017,(9)
水质的时间变化趋势预测是进行水环境管理的前提,预测模型在很大程度上决定了预测精度的高低,如何选取有效的时间序列水质预测模型是目前的研究热点之一。以平西湖为研究对象,根据2009-2011年间TN、TP和CODMn月监测数据,提出了一种基于ARIMA和RBF-NN的组合模型,该模型能同时反映水质的渐变性和非线性变化的特点,最后用5个精度评价指标对组合模型的预测结果进行了评价,并和基于ARMMA和时间序列神经网络预测模型的预测结果进行了比较。结果表明,大部分指标显示ARIMA/RBF-NN组合模型对受内生变量影响较大的TN、TP的预测效果最好,ARIMA模型对受外生变量影响较大的CODMn的预测效果最优。 相似文献
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基于灰色预测模型GM(1,1)的人才需求分析 总被引：16，自引：2，他引：14
本文以灰色系统理论为依据,构建了广东省科技人才需求量灰色预测模型,为人才决策提供了科学的预测方法。并且,还将灰色预测模型与基于时间序列及主因子GDP回归等模型的应用结果进行了对照分析。 相似文献
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内蒙古自治区建设用地需求量灰色预测 总被引：4，自引：0，他引：4
庄元 《内蒙古科技与经济》2006,(19):37-38
本文运用灰色系统理论,建立了内蒙古自治区建设用地需求量的灰色预测模型,并通过残差检验、关联度检验和后验差检验等方法对模型进行验证。从对内蒙古自治区建设用地需求量的预测结果来看,对历史实际值拟合得比较好,表明了模型具有较高的可靠性和实用性,并利用该模型对内蒙古自治区2006~2010年建设用地需求量进行预测。 相似文献
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运用回归分析预测法和时间序列分析法两种模型,以文献计量学为例,对近年来相关文献量的统计数据进行拟合与预测,并对两种预测模型的结果进行对比分析。结果表明,时间序列预测模型对文献计量学研究的模拟预测效果较好。两种预测模型不仅适用于文献计量学发展研究,对于其他领域也同样适用。针对不同领域的学科发展趋势,在进行数据模拟和分析预测时要根据统计数据的多少和分布情况,选取一种相对效果更好并且方便可行的预测方法。 相似文献
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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
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《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
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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
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《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
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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
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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
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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
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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
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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
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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