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Eu3+ emission in SrAl2B2O7 based phosphors
Yuming Yang,Zhouyun Ren,Yanchun Tao,Yuming Cui,Hua Yang 한국물리학회 2009 Current Applied Physics Vol.9 No.3
Eu3+ doped SrAl2B2O7 phosphors were fabricated by the wet method. The structures of the phosphors were characterized by XRD. The doping content of Eu3+ ions in SrAl2B2O7:Eu3+ phosphors are 1%, 4%, 6%, 8%, 10% (molar fraction), respectively. Luminescence properties were analyzed by measuring the excitation and photoluminescence spectra. The luminescent properties of SrAl2B2O7:Eu3+ phosphors are discussed. It is shown that from 4% to 6% of doping content of Eu3+ ions under 392 nm excitation in SrAl2B2O7:Eu3+ phosphors is optimum.
Yuming Cui 대외경제정책연구원 2013 East Asian Economic Review Vol.17 No.3
The aim of this paper is to estimate the degree of RMB misalignment from its equilibrium exchange rate by applying the Behavioral Equilibrium Exchange Rate (BEER) approach. We employ monthly data with reference to China’s top 20 trading partners covering the period of 1997 to 2012. We find that the RMB was slightly overvalued before 2001 and significantly undervalued by up to 20 per cent in the end of 2006. There is evidence showing that the RMB approached to its equilibrium level from 2007 to 2008. However, the global financial crisis interrupted the trend of declining misalignment of RMB exchange rate. The RMB’s total misalignment increased to around 25 per cent in the mid-2011 mainly because the RMB was re-pegged to the US dollar and some currencies of China’s main trading partners depreciated during the period of crisis. More recently, the degree of RMB misalignment slightly declined since 2012 when the RMB proceeded to appreciate and China’s ratio of current account surplus to GDP dropped considerably. Our findings prove that there is a trend of the RMB approaching to its equilibrium exchange rate since 2007 except for the period of crisis.
A Genetic Heterogeneity of Renpenning Syndrome Mapped to Chromosome Xq21-Xqter
Cui, Bin,Sun, Yuming,Sun, Yuqin,Shi, Yuefeng,Pei, Gang,Kong, Xiangyin,Hu, Landian 한국유전학회 2004 Genes & Genomics Vol.26 No.1
Renpenning sysndrome is an X-linked mental retardation associated with short stature, moderate microcephaly, unremakdable facies, and no other neurological abnormality. Renpenning first reported this disorder in a Mennonite family, and using this family, Renpenning Syndrome (RENS) has been mapped to Xp11.2-p11.4 Xu Cs found a Chinses family with an X-linked hereditary disease, and the clinical phenotype is similar to RENS. Recently, we performed the linkage analysis, and the result has shown ht egenetic heterogeneity of Renpenning Syndrome: a suggestive novel locus mapped to Xq21-Xqter in this Chinese family.
Adaptive Prescribed Performance Output Regulation of Nonlinear Systems with Nonlinear Exosystems
Fujin Jia,Cui Lei,Junwei Lu,Yuming Chu 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.8
The paper studies the prescribed performance output regulation problem for a class of nonlinear uncertain strict-feedback systems which are driven by nonlinear exosystems. Fuzzy logic systems (FLSs) are used to approximate the unknown functions. A fuzzy adaptive observer is designed to estimate the system state. A fuzzy internal model is designed to reject disturbance. Simultaneously, a parameter-type Lyapunov function and L function are designed to ensure the prescribed performance of the system. As illustrated by example, the proposed prescribed performance fuzzy adaptive output feedback control scheme is shown to guarantee semi-globally uniformly ultimately bounded, and the dynamic performance and steady-state performance of the tracking error are dependent on the prescribed performance functions.