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基于线性光谱混合模型(LSMM)的两种不同端元值选取方法应用与评价——以广州市为例 总被引:4,自引:1,他引:3
通过分别采用纯像元指数(PPI)和手动选取端元这两种不同的方法获得了2003年广州市区的植被、水体和不透水层3种端元,然后利用线性波谱分离法得到各个端元的丰度图像和均方根误差图像,从而获得广州市老八区不透水层的分量图。另外,还对比分析了基于线性光谱混合模型(LSMM)两种终端单元的选取方法的优缺点,并从定性的角度对所得结果进行精度评价。结果显示:基于线性光谱混合模型(LSMM)的方法获得广州市老八区不透水层的分量图是可行而有效的;手动选取端元的方法比纯像元指数(PPI)能够得到更高精度的分量图。 相似文献
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Lee Spencer Martin Jakobsen Sunay Shah Graham Cairns 《Journal of the Society for Information Display》2013,21(8):352-360
There has been a rapid increase in the resolution of small‐sized and medium‐sized displays. This study determines an upper discernible limit for display resolution. A range of resolutions varying from 254–1016 PPI were evaluated using simulated display by 49 subjects at 300 mm viewing distance. The results of the study conclusively show that users can discriminate between 339 and 508 PPI and in many cases between 508 and 1016 PPI. 相似文献
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John F. Y. Yeung Albert P. C. Chan Daniel W. M. Chan Leong Kwan Li 《Construction Management & Economics》2013,31(12):1219-1237
Over the past decade, research studies on benefits, critical success factors, difficulties, process, conceptual and theoretical models of construction partnering have been ubiquitous in the construction management discipline. In fact, there is adequate evidence that an increasing number of client organizations are adopting a partnering approach to undertake their building and construction projects both locally and worldwide during the last decade. With the perceived benefits that partnering brings about, research into Key Performance Indicators (KPIs) to evaluate the success of partnering projects in construction becomes vital as it can help set a benchmark for measuring the performance level of partnering projects. However, although there are some related studies and papers on this research area, few, if any, comprehensive and systematic studies focus on developing a comprehensive, objective, reliable and practical performance evaluation model for partnering projects. A model has been developed using the Delphi survey technique to objectively measure the performance of partnering projects in Hong Kong based on a consolidated KPIs' conceptual framework previously developed for partnering projects. Four rounds of Delphi questionnaire survey were conducted with 31 construction experts in Hong Kong. The results reveal that the top seven weighted KPIs to evaluate the success of partnering projects in Hong Kong were: (1) time performance; (2) cost performance; (3) top management commitment; (4) trust and respect; (5) quality performance; (6) effective communications; and (7) innovation and improvement. A statistically significant consensus on the top seven weighted KPIs was also obtained. Finally, a composite Partnering Performance Index (PPI) for partnering projects in Hong Kong was derived to provide an all‐round assessment of partnering performance. Different partnering projects can now be assessed on the same basis for benchmarking purposes. Construction senior executives and project managers can thus use the Index to measure, evaluate and improve the performance of their partnering projects to strive for construction excellence. Although the PPI was developed locally in Hong Kong, the research method could be replicated in other parts of the world to produce similar indices for international comparison. Such an extension would aid the understanding of managing partnering projects across different geographic locations. 相似文献
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蛋白质交互作用(PPI)网络聚类算法是研究和揭示蛋白质功能的主要方法之一。由于PPI网络的特性,传统算法不能有效聚类。文中提出一种基于蜂群和广度优先遍历的聚类算法。为避免噪声点对实验结果的干扰,在预处理阶段利用距离-密度算法确定聚类个数,剔除噪声点。然后利用结点网络综合特征值确定初始聚类中心,利用广度优先遍历搜索算法进行聚类。再采用改进的蜂群算法自动寻找最优合并阈值。最后用正确率和查全率对该算法进行性能评价并对算法中一些重要参数进行仿真分析,仿真结果表明该聚类算法有效提高PPI网络的聚类效果。 相似文献
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蛋白质交互网络预测是后基因组时代生物学中很重要的研究内容。到目前为止,对蛋白质交互网络相互作用的预测都是假设相互作用是确定的。但是,蛋白质交互网络和其它的一些生物数据会因为实验检测方法的局限性而呈现出不确定性。提出了一种基于信息传播的不确定性PPI网络的链接预测算法。在每个顶点对上按其出现链接的概率定义了链接信息量,该算法将边上的链接信息量在图上以一定的概率来传播。利用标准数据集进行测试,实验结果表明,所提出的算法具有很好的准确率和良好的生物统计特性。 相似文献
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Chemical biology and the application of small molecules has proven to be a potent perturbation strategy, especially for the functional elucidation of proteins, their networks, and regulators. In recent years, the cellular thermal shift assay (CETSA) and its proteome-wide extension, thermal proteome profiling (TPP), have proven to be effective tools for identifying interactions of small molecules with their target proteins, as well as off-targets in living cells. Here, we asked the question whether isothermal dose–response (ITDR) CETSA can be exploited to characterize secondary effects downstream of the primary binding event, such as changes in post-translational modifications or protein–protein interactions (PPI). By applying ITDR-CETSA to MAPK14 kinase inhibitor treatment of living HL-60 cells, we found similar dose–responses for the direct inhibitor target and its known interaction partners MAPKAPK2 and MAPKAPK3. Extension of the dose–response similarity comparison to the proteome wide level using TPP with compound concentration range (TPP-CCR) revealed not only the known MAPK14 interaction partners MAPKAPK2 and MAPKAPK3, but also the potentially new intracellular interaction partner MYLK. We are confident that dose-dependent small molecule treatment in combination with ITDR-CETSA or TPP-CCR similarity assessment will not only allow discrimination between primary and secondary effects, but will also provide a novel method to study PPI in living cells without perturbation by protein modification, which we named “small molecule arranged thermal proximity coaggregation” (smarTPCA). 相似文献