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基于多样化流形学习的非线性矩阵分解数据聚类
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作者 郑淦专 李原浩 《计算机应用与软件》 北大核心 2024年第11期309-318,共10页
为了捕获多方面数据中的局部几何结构,提升聚类性能,提出一种基于多样化流形学习的非线性矩阵分解数据聚类方法。为每一种相互关系构造一个P近邻图,以捕获两种不同类型的密切相关对象,从而准确地学习在数据的内部关系和内部关系上产生... 为了捕获多方面数据中的局部几何结构,提升聚类性能,提出一种基于多样化流形学习的非线性矩阵分解数据聚类方法。为每一种相互关系构造一个P近邻图,以捕获两种不同类型的密切相关对象,从而准确地学习在数据的内部关系和内部关系上产生的多个流形,并在用非线性矩阵分解映射到新的低维数据空间时稳定地保持所学习的多样流形。多个数据集聚类结果表明该方法能够充分挖掘各种相关类型的部分表示,在精度和效率上均具备一定优势。 展开更多
关键词 多面数据 聚类 流形学习 P近邻图
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Studying surface structure in desert areas using multiple kinds of surface wave data 被引量:1
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作者 Cheng Suo Gang Tian Zhanjie Shi 《Applied Geophysics》 SCIE CSCD 2007年第1期1-7,共7页
Shallow surface wave methods are mostly used for investigation of the surface velocity structure in environmental and engineering geophysics in non-desert areas. For the special geological features of the Takelamagan ... Shallow surface wave methods are mostly used for investigation of the surface velocity structure in environmental and engineering geophysics in non-desert areas. For the special geological features of the Takelamagan Desert area, we use the multi-channel analysis of surface wave (MASW) method to process multi-channel shallow surface wave records to determine the near surface velocity structure in the desert area. We also process, analyze, and compare the surface waves in many-trace records extracted from the oil exploration shot gathers in the area. We show that the MASW method can determine detailed shallow velocity structure in desert areas and the many-trace records can be used to get detailed deep geological structure. The combination of the two different datasets can obtain the exact velocity structure upper 60 m depth in the survey area. 展开更多
关键词 desert area near surface structure shot records multi-channel analysis of surface wave.
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Prediction of Gravity Anomalies Over the South China and Philippine Seas from Multi-satellite Altimeter Sea Surface Heights 被引量:1
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作者 Isaac Dadzie LI Jiancheng CHU Yonghai 《Geo-Spatial Information Science》 2008年第3期174-179,共6页
t Gravity anomalies on a2.5 ×2.5 arc-minute grid in a non-tidal system were derived over the South China and Philippine Seas from multi-satellite altimetry data. North and east components of deflections of the ve... t Gravity anomalies on a2.5 ×2.5 arc-minute grid in a non-tidal system were derived over the South China and Philippine Seas from multi-satellite altimetry data. North and east components of deflections of the vertical were computed from altimeter-derived sea surface heights at crossover locations, and gridded onto a 2.5 × 2.5 arc-minute resolution grid. EGM96-derived components of deflections of the vertical and gravity anomalies gridded into 2.5 × 2.5 arc-minute resolutions were then used as reference global geopotential model quantities in a remove-restore procedure to implement the Inverse Vening Meinesz formula via the 1D-FFT technique to predict the gravity anomalies over the South China and Philippine Seas from the gridded altimeter-derived components of deflections of the vertical. Statistical comparisons between the altimeter-derived and the shipboard gravity anomalies showed that there is a root-mean-square agreement of 5.7 mgals between them. 展开更多
关键词 satellite altimetry sea surface heights deflections of the vertical gravity anomalies
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Monitoring Spatio-temporal Variance of an Extreme Heat Event Using Multiple-source Remote Sensing Data 被引量:3
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作者 ZHU Shanyou LIU Yi +3 位作者 HUA Junwei ZHANG Guixin ZHOU Yang XIANG Jiamin 《Chinese Geographical Science》 SCIE CSCD 2018年第5期744-757,共14页
Extreme heat events have serious effects on human daily life. Accurately capturing the dynamic variance of extreme high-temperature distributions in a timely manner is the basis for analyzing the potential impacts of ... Extreme heat events have serious effects on human daily life. Accurately capturing the dynamic variance of extreme high-temperature distributions in a timely manner is the basis for analyzing the potential impacts of extreme heat, thereby informing risk prevention strategies. This paper demonstrates the potential application of multiple source remote sensing data in mapping and monitoring the extreme heat events that occurred on Aug. 8, 2013 in Jiangsu Province, China. In combination with MODIS products, the thermal sharpening(Ts HARP) method and a binary linear model are compared to downscale the original daytime FengY un 2 F(FY-2 F) land surface temperature(LST) imagery, with a temporal resolution of 60 min, from 5 km to 1 km. Using the meteorological measurement data from Nanjing station as the reference, the research then estimates the instantaneous air temperature by using an iterative computation based on the Surface Energy Balance Algorithm for Land(SEBAL), which is used to analyze the spatio-temporal air temperature variance. The results show that the root mean square error(RMSE) of the LST downscaled from the binary linear model is 1.30℃ compared to the synchronous MODIS LST, and on this basis the estimated air temperature has the RMSE of 1.78℃. The spatial and temporal distribution of air temperature variance at each geographical location from 06:30 to 18:30 can be accurately determined, and indicates that the high temperature gradually increases and expands from the city center. For the spatial distribution, the air temperature and the defined scorching temperature proportion index increase from northern to middle, to southern part of Jiangsu, and are slightly lower in the eastern area near the Yellow Sea. In terms of temporal characteristics, the percentage of area with air temperature above 37℃ in each city increase with time after 10:30 and reach the peak value at 14:30 or 15:30. Then, they decrease gradually, and the rising and falling trends become smaller from the southern cities to the northern regions. Moreover, there is a distinct positive relationship between the percentage of area above 37℃ and the population density. The above results show that the spatio-temporal distributions of heat waves and their influencing factors can be determined by combining multiple sources of remotely sensed image data. 展开更多
关键词 extreme heat events land surface temperature air temperature downscale remote sensing
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A Research for a Division of Regular Polyhedron by Rhombic Dodecahedron
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作者 Jun Hee Mun Jong Youll Park 《Journal of Mathematics and System Science》 2014年第8期569-573,共5页
Abstract:A space-filling polyhedron is a polyhedron which 'tile' space, analogous to the way of certain polygons tiled the plane. The cube is the unique space-filling platonic solid. If we make line connections the... Abstract:A space-filling polyhedron is a polyhedron which 'tile' space, analogous to the way of certain polygons tiled the plane. The cube is the unique space-filling platonic solid. If we make line connections the center with the vertices in the certain cube, the cube is divided into six pyramids. And if we glued six pyramids to the faces of the cube, we obtain a 'rhombic dodecahedron'. Since cubes are packing a space, rhombic dodecahedra are also space-filling polyhedra and a rhombic dodecahedron is divided into two regular tetrahcdra and one regular octahedron. In this study, we present how rhombic dodecahedron can be split into tetrahedra and octahedron. In this process, we can research a variety of divisions of regular polyhedron. 展开更多
关键词 Rhombic dodecahedron CUBE TETRAHEDRON octahedron.
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通信枢纽楼能耗运行分析研究 被引量:1
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作者 樊春锋 伍建萍 《电信工程技术与标准化》 2016年第5期89-92,共4页
如何在业务量不断增加,电源容量无法扩容的情况下,更好地解决供电能力紧张、机房装机位不足、机房散热等问题,是本论文的研究意义所在。本文通过对S省通信枢纽楼能耗运行分析,给出以上难点的合理化建议和建设指导原则。
关键词 枢纽楼 变压器 能耗 红色预警 搬迁
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