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Sensitivity Analysis of Generalized Gaussian Process Models for Variable Importance Measure
Xinmin Zhang,Manabu Kano,Yuan Li 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
In machine learning, Gaussian process regression (GPR) has been gaining popularity due to its nonparametric Bayesian form. However, the traditional GPR model is designed for continuous real-valued outputs with a Gaussian assumption, which does not hold in some engineering application studies. For example, when the output variable is count data, it violates the assumptions of the GPR model. Generalized Gaussian process regression (GGPR) can overcome the drawbacks of the conventional GPR, and it allows the model outputs to be any member of the exponential family of distributions. Thus, GGPR is more flexible than GPR. However, since GGPR is a nonlinear kernel-based method, it is not readily accessible to understand the effect of each input variable on the model output. To tackle this issue, the sensitivity analysis of GGPR (SA-GGPR) is proposed in this work. SA-GGPR aims to identify factors that exert higher influence on the model output by utilizing the information from the partial derivative of the GGPR model output with respect to its inputs. The proposed method was applied to a nonlinear count data system. The application results demonstrated that the proposed SA-GGPR is superior to the PLS-Beta, PLS-VIP, and SA-GPR methods in identification accuracy.
Luminescence enhancement by energy transfer from Ce3+ ions in Ba1.6Ca0.4P2O7:Ce3+:Tb3+ phosphor
Xinmin Zhang,Wen-lan Li,장경혁,서효진 한국물리학회 2012 Current Applied Physics Vol.12 No.1
The optical properties of Ba1.6Ca0.4P2O7 doped with Ce3+ and Tb3+ are investigated. Under excitation at 280 nm the emission spectrum of Ba1.6Ca0.4P2O7:Ce3+ consists of a peak at 370 nm and a shoulder at the longer wavelength side. The emission spectra of Ba1.6Ca0.4P2O7:Tb3+ shows the well-known emission lines due to 5D4-7FJ transitions of Tb3+. The green emissions of Tb3+ ions are enhanced upon UV excitation through energy transfer from Ce3+ to Tb3+ ions. The efficiency of such an energy transfer is estimated based on spectroscopic data. The dependence of photoluminescence (PL) intensities of Ce3+ and Tb3+ emissions on Ce3+ or Tb3+ concentrations in the systems (Ba1.6Ca0.4P2O7:0.04Ce3+,xTb3+ and Ba1.6Ca0.4P2O7:xCe3+,0.04Tb3+) and the temperature dependence of PL emission spectra of Ba1.6Ca0.4P2O7:0.06Ce3+,0.04Tb3+ is also investigated.
Luminescence properties of novel Ce^3+, Mn^2+ doped NaSr_4(BO_3)_3 phosphors
Xinmin Zhang,Xuebin Qiao,서효진 한국물리학회 2011 Current Applied Physics Vol.11 No.3
A new borate compound NaSr_4(BO_3)_3 doped with Ce^3+, Mn^2+ was prepared by a solid-state reaction at high temperature. The photoluminescence (PL) excitation and emission spectra, low temperature emission spectra and decay curves of Ce^3+, Mn^2+ in NaSr_4(BO_3)_3 were studied. The PL properties of Ce^3+, Mn^2+ co-doped NaSr_4(BO_3)_3 were also investigated. NaSr_4(BO_3)_3:Ce^3+, Mn^2+ phosphors emit two distinctive colors: a blue band centered at 435 nm originating from Ce^3+ and a red band at 660 nm caused by Mn^2+. The results indicate that there exist energy transfer from Ce^3+ to Mn^2+ in the NaSr_4(BO_3)_3 doped with Ce^3+, Mn^2+ system.
XinMin Wu,Huilan Wang 한국전산응용수학회 2008 Journal of applied mathematics & informatics Vol.26 No.1
Prey-predator model, diffusion, positive periodic solution, coincidence degree,attractivity By employing the continuation theorem of coincidence degree theory, we derive a sufficient condition for the existence and attractricity of a positive periodic solution for a generalized predator-prey model with diffussion feedback controls.
Ruan Xinmin,Du Hongyang,Zhan Xinchun,Cong Xihan,Shi Fuzhi,Li Juan,Luo Zhixiang,Dong Zhaorong 한국식물생명공학회 2023 Plant biotechnology reports Vol.17 No.1
Developing genotypes with high-nitrogen use efficiency is a prerequisite for achieving sustainable agriculture and high yields. In this study, both physiological and metabolic analyses were performed to evaluate the NUE (nitrogen use efficiency) of two elite indica rice cultivars: OM052 and Huanghuazhan (HHZ). The pNUE and gNUE of OM052 were higher than HHZ under three N conditions, and significant (p < 0.05) especially under both LN and MN conditions. The contents of soluble sugar and malate were significantly different between OM052 and HHZ under LN and HN conditions. The GDH activity in OM052 was significantly high than that in HHZ under HN condition. Metabolic analyses showed that 136 and 142 differentially accumulating metabolites were identified between OM052 and HHZ under LN and HN conditions, respectively. KEGG analysis showed that ‘aminoacyl-tRNA biosynthesis’ was also the most significant enriched in LN_OM052 vs. LN_ HHZ and ‘Glyoxylate and dicarboxylate metabolism’ and ‘citrate cycle’ were the most significantly enriched in HN_OM052 vs. HN_ HHZ. The contents of four metabolites (cis-aconitate, isocitrate, fumarate, and malate) involved in the TCA cycle were significantly upregulated in HN condition compared with LN condition, regardless of OM052 and HHZ. Taken together, the results of our study revealed the physiological and metabolic differences underlying the OM052 and HHZ and provide new insights into coordinating C and N metabolism and improving the NUE of rice.
Magnetic and Thermal Analysis of a Water-cooled Permanent Magnet Linear Synchronous Motor
Zhang, Xinmin,Lu, Qinfen,Cheng, Chuanying,Ye, Yunyue Journal of International Conference on Electrical 2012 Journal of international Conference on Electrical Vol.1 No.4
The water-cooled Permanent Magnet Linear Synchronous Motor (PMLSM) has a wide range of applications due to high efficiency, high thrust force density and high acceleration. In order to ensure normal operation and maximum output, both the magnetic and thermal performance are vital to be considered. Based on ANSYS software, electromagnetic and thermal finite-element analysis (FEA) models of a 14-pole, 12-slot water-cooled PMLSM are erected adopting suitable assumptions. Firstly, the thrust force and force ripple with different current densities are calculated. Secondly, the influence of different water flow on the motor heat dissipation and force performance under different operationional conditions are investigated and optimized. Furthermore, for continuous operation, the temperature rise and thrust feature are studied under the rated load 8A, the proper temperature $120^{\circ}C$ and the limited temperature $155^{\circ}C$. Likewise, for short-time operation, the maximum duration is calculated when applied with a certain large current. Similarly, for intermittent operation, load time as well as standstill time are determined with the optimal current to achieve better thrust performance.
Linear Estimation for Measurement-Delay Systems With Periodic Coefficients and Multiplicative Noise
Song, Xinmin,Park, Ju H.,Yan, Xuehua Institute of Electrical and Electronics Engineers 2017 IEEE Transactions on Automatic Control Vol. No.
<P>This technical note is concerned with the remote estimation problem for measurement-delay systems with multiplicative noise and periodic coefficients. The multiplicative noise in every communication channel is described by an independent and identically distributed (i.i.d) Bernoulli process. The quality of the estimation achieved by an admissible filter is measured by a performance criterion described by the Cesaro limit of the mean square of the deviation between the remote signal and the estimated signal. The filter is designed in terms of the unique periodic solution of a Lyapunov equation together with the periodic stabilizing solution of a Riccati equation. In the end, we supply a numerical example to show the effectiveness of our proposed estimation approach.</P>