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Search Results: 1 - 10 of 163492 matches for " WANG Xiao-ming "
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Study on evaluation of default probability based on generalized additive models

WANG Xiao-ming,

系统工程理论与实践 , 2008,
Abstract: 在现代商业银行的信用风险评估中,违约概率度量具有核心地位.传统的违约概率模型解释性强、计算强度小而应用方便,但容易产生模型设定偏差;现代人工智能模型预测精度高,却又存在解释性差、计算强度高和过度拟合等问题.为此,提出一类基于广义可加模型的违约概率模型,并对这类模型的拟合精度和预测效果进行实证比较.研究表明,广义可加违约概率模型不仅具有很高的预测精度,而且具有良好的可解释性和计算效率.另外,还从实际应用的角度出发,对该类模型拟合过程中可能存在的限制和困难进行探讨和分析,以利于对该方法的进一步的理论研究和实际应用.
Testament signing protocol on Web based on elliptic curve

WANG Xiao-ming,

计算机应用 , 2005,
Abstract: Testament signing protocol was designed based on elliptic curve,according to the designated confirmer signature idea.This protocol can protect testator's testament from being copied,spreaded and changed.The testament can be authenticated and protected when testator died.Moreover,this protocol can defend any cheats and attacks,and it is secure,efficient,simple and practical.
Operator Quantum Geometric Tensor and Quantum Phase Transitions
Xiao-Ming Lu,Xiaoguang Wang
Physics , 2010, DOI: 10.1209/0295-5075/91/30003
Abstract: We extend the quantum geometric tensor from the state space to the operator level,and investigate its properties like the additivity for factorizable models and the splitting of two kinds contributions for the case of stationary reference states. This operator-quantum-geometric tensor (OQGT) is shown to reflect the sensitivity of unitary operations against perturbations of multi parameters. General results for the cases of time evolutions with given stationary reference states are obtained. By this approach, we get exact results for the rotated XY models, and show relations between the OQGT and quantum criticality.
Xiao-Ming Wang,Wei Cheng,Yu-Wang Han
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536808040257
Abstract: In the molecule of title compound, C12H14O3, the benzodioxole ring system is essentially planar. In the crystal structure, weak intermolecular C—H...O hydrogen bonds link molecules into chains along the c axis, and π–π contacts between dioxole rings and between dioxole and benzene rings of the benzodioxole ring systems [centroid–centroid distances 3.702 (3) and 3.903 (3) ] may further stabilize the structure. Two C—H...π interactions are also found.
Ya HE,Zheng-Huan WANG,Xiao-Ming WANG
动物学研究 , 2014, DOI: 10.13918/j.issn.2095-8137.2014.6.528
Abstract: Cervussichuanicusisaspeciesofsikadeer(CervusnipponGroup).Todate,researchhasmainlyfocusedonquantitysurveyingandbehaviorstudies,withgeneticinformationonthisspeciescurrentlydeficient.Toprovidescientificevidencetoassistintheprotectionofthisspecies,wecollectedSichuansikadeerfecalsamplesfromtheSichuanTiebuNatureReserve(TNR)andextractedDNAfromthosesamples.MicrosatellitelociofbovinewereusedforPCRamplification.AfterGeneScan,thegenotypedatawereusedtoanalyzethegeneticdiversityandpopulationstructureoftheSichuansikadeerinTNR.ResultsshowedthattheaverageexpectedheterozygosityoftheSichuansikadeerpopulationinTNRwas0.562,equivalenttotheaverageexpectedheterozygosityofendangeredanimals,suchasProcapraprzewalskii.Furthermore,8of9microsatellitelocisignificantlydeviatedfromtheHardy-WeinbergequilibriumandtwogroupsexistedwithintheSichuansikadeerTNRpopulation.ThisgeneticstructuremaybecausedbyagroupofManchuriansikadeer(Cervushortulorum)releasedinTNR.
Complete Gluonic Phase in Two-Flavour Colour Superconductivity

WANG Xiao-Ming,ZHOU Bang-Rong,

中国物理快报 , 2008,
Abstract: We study a typical complete gluonic phase (LGP) in two-flavour colour superconductivity (2SC) by calculating the essential cubic and quartic interfering term between the gluonic condensates < A8z> and < A6z> with a gauged NJL model. It is proven that the coefficients of the cubic interfering term and the vacuum contributions of the cubic and quartic interfering term are all equal to zeroes. The coefficients of the quartic interfering term and the< A6z> 's quartic self-interaction term at stationary points of Larkin--Ovchinnikov--Fulde--Ferrell (LOFF) phase are calculated. Comparisons among the effective potentials of LGP, g2SC and LOFF phase indicate that LGP could be the genuine ground state of 2SC for some reasonable parameters.


菌物学报 , 1993,
Abstract: In low temperature storage one culture of Colletotrichum lindemuthianum (Sacc. et Magn.) Br. et Cav., the pathogen of bean anthracnose, only produced perithecia but not conidia. The morphology, cultural character and monoascospore culture of the fungus was studied and compared with allied species. The result showed that this ascogenous culture isolated from conidia was Glomerella lindemuthianum Shear. The ascospore infected bean leaves by antificial inoculation, and the sympton was the same as that of C. lindemuthianum. In reisolation of pathogen, anamorphic conidia was first produced in culture, but teleomorph recovered soon after for several generations. The fact proved that the fungs was homothallic. The alternation and relation between perfect and imperfect stages indicated that this fungus was a holomorph: G. lindemuthianum was the teleomorph of C. lindemuthianum which was the anamorph.
CIS: An Iterative Spread-based Algorithm for Clustering Micro-array Data

WANG Xiao-Ming,YIN Ying,

计算机科学 , 2007,
Abstract: DNA Micro-array technique makes it possible to simultaneously monitor the expression levels of tens of thousands of genes.The traditional clustering methods will suffer from the curse of dimensionality when directly applied to Micro-array data.The two common dimensionality reduction methods,i.e.feature transformation and feature selection,are unsuitable for the analysis of Micro-array data,since the former generates the new features difficult to interpret and the latter misses some information.Besides,most traditional clustering algorithms need the user-specific parameters,which may result in quite different results.In this paper,we present an iterative spread-based algorithm,namely CIS,for clustering Micro-array data,which selects threshold automatically.Instead of feature selection and feature transformation,in a progressively refining manner,CIS repeatedly partitions the genes with the new-generated sample clusters as features,and then partitions the samples with the new-generated gene clusters as features.The algorithm is applied to two real gene Micro-array data sets.Experiment results confirm its effectiveness and efficiency.
Electrical Neutrality and Symmetry Restoring Phase Transitions at High Density in a Two-Flavor Nambu-Jona-Lasinio Model
Wang, Xiao-Ming;Zhou, Bang-Rong
High Energy Physics - Phenomenology , 2007, DOI: 10.1088/0253-6102/47/6/024
Abstract: A general research on chiral symmetry restoring phase transitions at zero temperature and finite chemical potentials under electrical neutrality condition has been conducted in a Nambu-Jona-Lasinio model to describe two-flavor normal quark matter. Depending on that $m_0/\Lambda$, the ratio of dynamical quark mass in vacuum and the 3D momentum cutoff in the loop integrals, is less or greater than 0.413, the phase transition will be second or first order. A complete phase diagram of $u$ quark chemical potential versus $m_0$ is given. With the electrical neutrality constraint, the region where second order phase transition happens will be wider than the one without electrical neutrality limitation. The results also show that, for the value of $m_0/\Lambda$ from QCD phenomenology, the phase transition must be first order.
Quantum Fisher Information Flow in Non-Markovian Processes of Open Systems
Xiao-Ming Lu,Xiaoguang Wang,C. P. Sun
Physics , 2009, DOI: 10.1103/PhysRevA.82.042103
Abstract: We propose to use the quantum Fisher information in characterizing the information flow of open quantum systems. This information-theoretic approach provides a quantitative measure to statistically distinguish Markovian and non-Markovian processes. A basic relation between the QFI flow and non-Markovianity is unveiled for quantum dynamics of open systems. For a class of time-local master equations, the exactly-analytic solution shows that the non-Markovianity is characterized by additive information sub-flows in different non-Markovian channels.
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