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Search Results: 1 - 10 of 41281 matches for " Tan Chang-Chun "
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Customer Segmentation of Credit Card Default by Self Organizing Map  [PDF]
Hui Wu, Chang-Chun Wang
American Journal of Computational Mathematics (AJCM) , 2018, DOI: 10.4236/ajcm.2018.83015
Abstract: In this paper we applied the technique of Self Organizing Map (SOM) to segment individuals based on their credit information. SOM is an unsupervised machine learning method that reduces data complexity and dimensionality while keeping sits original topology, which is superior to other dimension reduction methods especially when features in data have unclear nonlinear relations. Through this method we provide more clear and intuitive segmentation that other traditional methods cannot achieve.
On the Strong Laws for Weighted Sums of ρ -Mixing Random Variables
Xing-Cai Zhou,Chang-Chun Tan,Jin-Guan Lin
Journal of Inequalities and Applications , 2011, DOI: 10.1155/2011/157816
Abstract:
On the Strong Laws for Weighted Sums of -Mixing Random Variables
Zhou Xing-Cai,Tan Chang-Chun,Lin Jin-Guan
Journal of Inequalities and Applications , 2011,
Abstract: Complete convergence is studied for linear statistics that are weighted sums of identically distributed -mixing random variables under a suitable moment condition. The results obtained generalize and complement some earlier results. A Marcinkiewicz-Zygmund-type strong law is also obtained.
Colorimetric investigation of normal tongue and lip colors from 516 healthy adults by visible reflection spectrum
Chang-chun Zeng
Zhong Xi Yi Jie He Xue Bao , 2011,
Abstract:
Calculation of travel-time curved face of common reflection surface
共反射面元走时曲面计算方法

TAN Wei-yi,ZHAO Bing,YANG Chang-chun,
谭未一
,,赵兵,杨长春

地球物理学进展 , 2007,
Abstract: Calculation of travel-time curved face of CRS is crucial to CRS stack.First,three attribute parameters in stacking formula of CRS must be determined by coherent researching and optimizing in traditional CRS stack to ascertain travel-time curved face of common reflection surface.But this method has three shortages.Firstly,the calculated amount of coherence researching and optimizing is enormous.Secondly,the stack formula just fit for small distance between shot and receiver.Finally,stack formula is not applicable when curvature radius of wave-front is negative and low.In this paper,one calculation method using ray tracing of CMP to fit travel-time curved face of CRS is put forward.Application of the method on model calculation shows an excellent performance of the algorithm both in accuracy and applicability compared to traditional CRS stack travel-time of curved face.
Quantitative analysis and classification of tongue inspection based on the visible reflection spectrum
Meng Kong,Chang-chun Zeng
Zhong Xi Yi Jie He Xue Bao , 2011,
Abstract: Objective: In this study, optical data on color of tongue tips were collected by using a visible reflection spectrum system. Quantitative method of tongue inspection and classification of tongue states including pale, pale red, red and crimson manifestations were investigated. Methods: Chromaticity coordinates of the tongue tips from 98 subjects were calculated on the basis of the visible reflection spectrum. The tongue color was quantified and classified by the visible reflection spectrum in the range from 590 nm to 780 nm, based on the higher red-band energy distribution on the tongue tip color. Results: It was found that comparison and analysis of tongue tip color from different samples would be well-suited after spectrum vector normalization, and the difference of tongue tip color between different samples could be observed easily when the tongue tip optical data were sited in CIE 1931 chromaticity diagram. The tongue tip colors were analyzed quantitatively and classified by the spectral energy intensity at the wavelength of 670 nm and (or) spectral energy ratio of red bank from 590 nm to 780 nm. The results of classification showed that there was sound corresponding accuracy with the clinical diagnosis of pale tongue, pale red tongue, red tongue and crimson tongue.Conclusion: In this study, based on the collection of the information data on tongue tip characteristics with the visible spectrum from 380 nm to 780 nm, the quantitative analysis of tongue inspection for pale tongue, pale red tongue, red tongue and crimson tongue was established. The quantitative value for tongue tip color is an effective method for classification of the condition of the tongue tip, which provides a useful tool for the modernization of tongue inspection in traditional Chinese medicine.
A review on the late Mesozoic extensional tectonics on the eastern North China Craton
华北东部晚中生代伸展构造作用

DUAN Qiu-liang,TAN Wei-yi,YANG Chang-chun,ZHANG Yan-ling,YAN Zhen,
段秋梁
,谭未一,杨长春,张延玲,闫臻

地球物理学进展 , 2007,
Abstract: Based on distribution characteristics of late Mesozoic metamorphic core complexes and prototype basins and geophysical characteristics of crust and upper mantle in the eastern North China Craton,the paper analyses the main controlling factors and formation mechanism of regional tectonic and lithospheric thinning and suggest that Mesozoic tectonic evolution of the studied area should result from subduction of Pacific plate,compression between Yangtze plate and North China plate and asthenosphere upwelling and the earth's surface,the boundary between upper and middle crust and Moho should be the key coupling interfaces between deep geologic process and shallow geologic structures.
Application and prospect of the formation microresistivity image well logging
微电阻率扫描成像测井方法应用及发展前景

WANG Jun,YANG Chang-chun,XU Da-hua,CHI Xiu-rong,TAN Mao-jin,
王珺
,杨长春,许大华,迟秀荣,谭茂金

地球物理学进展 , 2005,
Abstract: As a new-developed tool of geophysical well logging , Formation Microresistivity Image well logging is able to image distinctly the medium of the formation around the mineshaft ,and can help to solve the three geological difficulties faced by well logging technique:1.efficiently distinguish thin sandstones from thin shales .2. analysis of fractures and their ability of storage.3.evaluate parameters in complex reservoir. But it has many shortages:1.slow logging speed.2.too expensive 3.poor result in quantificationally interpretation. The three international companies of well logging initiated this research comparatively early and achieved many results, and have brought out commercial productions. Our country started this research a little late ,but has made great progress in recent years. In the future , we should overcome some theoretical and technical difficulties , and put out our better Formation Microresistivity Image tool and interpretation technique.
Evolution of a Thermo Vacuum State in a Single-Mode Amplitude Dissipative Channel

WANG Chang-Chun,FAN Hong-Yi,

中国物理快报 , 2010,
Abstract:
Research on a fully-data driven multiple attenuation approach
数据驱动型多次波衰减方法的研究

WU Di,YANG Chang-chun,
吴迪

地球物理学进展 , 2008,
Abstract: 在油气田勘探过程中,多次波的存在往往会直接影响地质构造的解释程度.鉴于自由界面的反射系数一般都远远大于地层的反射系数,与之相关多次波具有更强的能量,更多的宽频带,本文聚焦于与表面相关多次波的模拟与衰减.表面多次波的衰减可以表述为一种迭代的过程,其中MPI(Wang,2003)是一种全数据驱动型的多次波建模方法,它是通过迭代修正多次波模型从而预测出更为精确的多次波.MPI多次波建模方法的显著特征在于它减弱了对表面操作因子的依赖性,即在先验信息未知的情况下,仍可以依据地震数据而模拟出较为精确的多次波模型,这种方法的另一特征在于它不仅在时间域而且在相位和振幅域也可以模拟出多次波模型.根据实际地震数据的应用效果,表明在给定一个一般精度的去多次波结果的情况下,通过利用全数据驱动型迭代反演可以建立更为精确的多次波模型,然后再把它从原始地震数据中减去,从而更为有效地压制和衰减多次波场能量.
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