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Guosheng Li,Jiawei Yang,Wenjie Wang,Zixuan Zhang,Weihua Zhang,Zeping Wu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.8
This paper proposes an enhanced augmented radial basis function (eARBF) metamodel combining radial basis function and polynomial chaos expansions for global sensitivity analysis. First, the conditions required for the augmented radial basis function are constructed from the perspective of variance decomposition, after which the analytical expressions of the Sobol’ indices are deduced. To improve the generalization performance of ARBF, an anisotropic technique is proposed based on the local density of sample points. Furthermore, the recursive evolution LHD and efficient K-fold cross-validation method are adopted to reduce computational efforts. Five cases are presented to demonstrate the performance of the proposed approach. In all cases, eARBF yields satisfactory results with lower computational effort. The results indicate that the approach proposed in this paper is promising for GSA of engineering problems.
Jinliang Zhang,Dunbin Zhu,Wei Jian,Wentao Hu,Guosheng Peng,Yufeng Chen,Zhihu Wang 한국자동차공학회 2024 International journal of automotive technology Vol.25 No.2
Aiming at the sensitivity problems of uncertain factors such as parameter variation, external disturbance and friction for thepermanent magnet synchronous motor control system of electric vehicle, a fractional order complementary non-singular terminalsliding mode control method based on neural network is proposed. The mathematical model of permanent magnet synchronousmotor with uncertain factors was established. The sliding mode controller was designed by combining the generalized slidingmode surface and the complementary sliding mode surface, which shortened the arrival time from the state trajectory to slidingmode surface. The fractional calculus operator with fi ltering characteristics was used to improve the position tracking accuracyand reduce the chattering. As for the variety of uncertain disturbances, the neural network was used to estimate the system totaluncertainty and compensate online to further improve the dynamic response ability and anti-interference ability. Finally, thesimulation results verify the eff ectiveness and feasibility of the proposed method, which can provide theoretical and technicalsupport for improving the control accuracy of permanent magnet synchronous motor and the development of electric vehicles.
PERIODIC SOLUTIONS FOR A QUASILINEAR NON-AUTONOMOUS SECOND-ORDER SYSTEM
Tian, Yu,Zhang, Guosheng,Ge, Weigao 한국전산응용수학회 2006 Journal of applied mathematics & informatics Vol.22 No.1
In this paper, a quasilinear second-order system with periodic boundary conditions is studied. By the least action principle and classical theorems of variational calculus, existence results of periodic solutions are obtained.
MULTI-POINT BOUNDARY VALUE PROBLEMS FOR ONE-DIMENSIONAL p-LAPLACIAN AT RESONANCE
Wang, Youyu,Zhang, Guosheng,Ge, Weigao 한국전산응용수학회 2006 Journal of applied mathematics & informatics Vol.22 No.1
In this paper, we consider the multi-point boundary value problems for one-dimensional p-Laplacian at resonance: $({\phi}_p(x'(t)))'=f(t,x(t),x'(t))$, subject to the boundary value conditions: ${\phi}_p(x'(0))={\sum}^{n-2}_{i=1}{\alpha}_i{\phi}_p(x'({\epsilon}i)),\;{\phi}_p(x'(1))={\sum}^{m-2}_{i=1}{\beta}_j{\phi}_p(x'({\eta}_j))$ where ${\phi}_p(s)=/s/^{p-2}s,p>1,\;{\alpha}_i(1,{\le}i{\le}n-2){\in}R,{\beta}_j(1{\le}j{\le}m-2){\in}R,0<{\epsilon}_1<{\epsilon}_2<...<{\epsilon}_{n-2}1,\;0<{\eta}1<{\eta}2<...<{\eta}_{m-2}<1$, By applying the extension of Mawhin's continuation theorem, we prove the existence of at least one solution. Our result is new.
Wang, Weizhen,Zhang, Juan,Hu, Honghong,Yu, Baojun,He, Jintong,Yao, Tingting,Gu, Yaling,Cai, Zhengyun,Xin, Guosheng Asian Australasian Association of Animal Productio 2022 Animal Bioscience Vol.35 No.11
Objective: Inosine monophosphate (IMP) is a key factor that imparts of meat flavor. Differences in the IMP content in the muscles were evaluated to improve chicken meat quality. Methods: For this study, the IMP content was detected by high performance liquid chromatography. The gene expression profiles of Jingyuan chickens with different feeding patterns and different sexes were analyzed by RNA-sequencing (RNA-seq). Results: Breast muscle IMP content in free-range chickens was extremely significantly higher than that of caged chickens (p<0.01). Breast muscle IMP content in hens was also higher than that of cocks, but the difference was not significant. Correlation analysis showed that the breast muscle IMP content in caged hens and cocks was negatively correlated with the shear force, and the breast muscle IMP content in free-range hens was significantly negatively correlated with the shear force (p<0.05). The two key genes associated with IMP synthesis in chickens with different feeding patterns were glutamate-ammonia ligase (GLUL) and phosphodiesterase 10A (PDE10A). Bioinformatics analysis revealed that the GLUL and PDE10A genes are involved in glutamine biosynthesis and purine salvage pathways respectively. In addition, GLUL expression was positively correlated with the IMP content in caged and free-range chickens, and PDE10A expression was significantly positively correlated with the IMP content in caged and free-range chickens (p<0.05). Conclusion: These findings will facilitate the comprehension of the deposition of IMP in the muscles and thereby aid the process of selection and breeding of good quality local chickens.
Periodic solutions for a quasilinear non-autonomous second-order system
Yu Tian,Guosheng Zhang,Weigao Ge 한국전산응용수학회 2006 Journal of applied mathematics & informatics Vol.22 No.1-2
In this paper, a quasilinear second-order system with periodic boundary conditions is studied. By the least action principle and classical theorems of variational calculus, existence results of periodic solutions are obtained.
Modeling of normal stiffness of mechanical joint based on anisotropic fractal theory
Wan Sun,Guosheng Lan,Xueliang Zhang 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.8
An idealized model of elliptical asperities was constructed by combining the geometric features of asperities on rough surfaces with the bivariate Weierstrass-Mandelbrot function for junction surfaces with anisotropic fractal characteristics. Based on the Hertz contact theory, the elastic and plastic contact properties of elliptical asperities were studied. It was assumed that the contact point area distribution, eccentricity distribution, and angle distribution of the mechanical joint are independent of each other. According to probability theory and the area size distribution function of the contact point, the three-dimensional joint distribution density functions of the area distribution, eccentricity distribution and angle distribution of the contact point were obtained. By extending the contact characteristics of a single asperity to the entire mechanical joint, a normal contact stiffness model of the mechanical joint was established. The influence of fractal parameters and material parameters on the normal contact stiffness of the mechanical joint was discussed by numerical simulation. Finally, the validity of the model was verified by comparing with the classical model and experimental data.
Cao Hongli,Zhang Guosheng,Ma Hui,Xue Zhongwen,Huo Ran,Wang Kun,Liu Zijin 한국미생물·생명공학회 2024 Journal of microbiology and biotechnology Vol.34 No.1
Refractory infections, such as hospital-acquired pneumonia, can be better diagnosed with the assistance of precise methicillin-resistant Staphylococcus aureus (MRSA) testing. However, traditional methods necessitate high-tech tools, rigorous temperature cycling, and the extraction of genetic material from MRSA cells. Herein, we propose a sensitive, specific, and extraction-free strategy for MRSA detection by integrating allosteric probe-based target recognition and exonuclease-III (ExoIII)-enhanced color reaction. The penicillin-binding protein 2a (PBP2a) aptamer in the allosteric probe binds with MRSA to convert protein signals to nucleic acid signals. This is followed by the DNA polymerase-assisted target recycle and the production of numerous single-strand DNA (ssDNA) chains which bind with silver ion (Ag+ ) aptamer to form a blunt terminus that can be identified by Exo-III. As a result, the Ag+ aptamer pre-coupled to magnetic nanoparticles is digested. After magnetic separation, the Ag+ in liquid supernatant catalyzes 3,3’,5,5’-tetramethylbenzidine (TMB) for a color reaction. In addition, a concentration of 54 cfu/mL is predicted to be the lowest detectable value. Based on this, our assay has a wide linear detection range, covering 5 orders of magnitude and demonstrating a high specificity, which allows it to accurately distinguish the target MRSA from other microorganisms.
Multi-Point Boundary Value Problems for One-Dimensional p-Laplacian at Resonance
Youyu Wang,Guosheng Zhang,Weigao Ge 한국전산응용수학회 2006 Journal of applied mathematics & informatics Vol.22 No.1-2
In this paper, we consider the multi-point boundary value problems for one-dimensional p-Laplacian at resonance: (p(x0(t)))0 = f(t, x(t), x0(t)), subject to the boundary value conditions: p(x0(0)) = n−2 X i=1 ip(x0(i)), p(x0(1)) = m−2 X j=1 jp(x0(j )) where p(s) = |s|p−2s, p > 1, i (1 i n−2) 2 R, j (1 j m−2) 2 R, 0 < 1 < 2 < · · · < n−2 < 1, 0 < 1 < 2 < · · · < m−2 < 1, By applying the extension of Mawhin’s continuation theorem, we prove the existence of at least one solution. Our result is new. AMS Mathematics Subject Classification: 34B10, 34B15 Key words and phrases : Multi-point boundary value problem, p-Laplacian, Resonance.
Yue Li,Xiaohan Chen,Guosheng Zhang 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.19 No.4
To study the effects of water-cement ratio changes and cracks on chloride ion transmission rate in cracked concrete, RCM method was adopted to accelerate the diffusion of chloride ion in cracked concrete, and the changes in chloride ion concentration and around the cracks are inferred by finite-element method. The test results show that as far as prefabricated cracks on concrete components are concerned, the width thresholds of two cracks on the concrete specimens with a water-cement ratio of 0.5 and 0.6 are 0.05 mm and 0.1 mm respectively, the width threshold of two cracks on the concrete specimens with a water-cement ratio of 0.4 is 0.05 mm and 0.2 mm respectively; and the results of numerical simulation show that the smaller the water-cement ratio is, the more significant effects of cracks on chloride ion transmission rate are. As a result, more attention shall be paid to the crack prevention, repairing and strengthening for high-strength concrete.