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A New Partially-coupled Recursive Least Squares Algorithm for Multivariate Equation-error Systems
Ping Ma 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.6
This paper focuses on the parameter estimation problems for multivariate pseudo-linear systems. Based on the parameters coupling characteristic of the system model, a new partially-coupled least squares algorithm is proposed. For convenience of comparison, the traditional least squares algorithm for multivariate systems is given. The proposed algorithm has better performances than the traditional algorithm. The calculation amounts of the two algorithms are analyzed, it is shown that the proposed algorithm has better computational efficiency. Two numerical simulation examples are given, and the results indicate that the proposed algorithm has better parameters identification accuracy.
Identification and expression analysis of grape LRK10L-2 genes during grape fruit development
Ma Jin-Ping,Yin Xue-Ren,Wei Tong-Lu,Liu Hai-Nan,Pei Mao-Song,Yang Sheng-Di,Jin Hui-Ying,He Guang-Qi,Guo Da-Long 한국식물생명공학회 2022 Plant biotechnology reports Vol.16 No.1
LRK10L-2 is known to be related to the plant disease response, little information is available about the relationship of LRK10L-2 and fruit ripening. The protein physicochemical properties, conserved domains, gene structures, subcellular locali- zation, expression patterns during grape fruit development and promoter activity of the members of grape LRK10L-2 gene family were explored in this study. A total of 109 LRK10L-2 family gene members were identified, and mainly distributed on chromosome 16. Almost all of them were located in the plasma membrane. Most of the LRK10L-2 genes contain four or five motifs, ranging from 0 to 5 introns and have the cis-acting elements related to hormones in their promoter regions. There were 20 pairs of tandem duplicates and 293 pairs of segmental duplication in LRK10L-2 family genes. It was proved that the expression of LRK10L-2 gene varied at the different fruit development stages of 'Kyoho' and its early-ripening bud mutant, ‘Fengzao’. The subcellular localization of VIT_16s0098g00160 and VIT_16s0098g00400 were in the plasma membrane, and had a significant enrichment of the GUS signal in N.benthamiana leaves for the promoter. The results lay a solid basis for the further functional researches of the LRK10L-2 genes for grape fruit ripening.
Ma Ping,Deng Tengfei,Ye Yongsheng,Wang Xinghua,Zhao Hongda 한국전기전자재료학회 2022 Transactions on Electrical and Electronic Material Vol.23 No.4
This paper mainly studies the stress and strain characteristics of electric vehicle cables under tensile state and its influence law on the electromagnetic characteristics. Firstly, the structure and characteristics of new energy vehicle cables are analyzed, and the three-dimensional solid model of the cables is established. The finite element method is used to analyze the deformation law and stress change characteristics of cables under diff erent tensile load conditions, so as to achieve the resistance change law of cables. Then the equivalent modeling method is established to simulate the electromagnetic characteristics of the cable. It is found that the tensile deformation increases the electromagnetic field intensity of some parts of the cable, leading to the irregular distribution of electromagnetic field in the entire cable. Finally, the variation law of electromagnetic field during the cable deformation is summarized.
POSITIVE SOLUTIONS OF A REACTION-DIFFUSION SYSTEM WITH DIRICHLET BOUNDARY CONDITION
Ma, Zhan-Ping,Yao, Shao-Wen Korean Mathematical Society 2020 대한수학회보 Vol.57 No.3
In this article, we study a reaction-diffusion system with homogeneous Dirichlet boundary conditions, which describing a three-species food chain model. Under some conditions, the predator-prey subsystem (u<sub>1</sub> ≡ 0) has a unique positive solution (${\bar{u_2}}$, ${\bar{u_3}}$). By using the birth rate of the prey r1 as a bifurcation parameter, a connected set of positive solutions of our system bifurcating from semi-trivial solution set (r<sub>1</sub>, (0, ${\bar{u_2}}$, ${\bar{u_3}}$)) is obtained. Results are obtained by the use of degree theory in cones and sub and super solution techniques.
( Ping Zhang Wang ),( Ying Xiong ),( Chuan Ma ),( Tai Ping Shi ),( Da Long Ma ) 생화학분자생물학회 (구 한국생화학분자생물학회) 2010 BMB Reports Vol.43 No.11
The c-Jun NH2-terminal kinase (JNK) signaling pathway participates in many physiological functions. In the current study we reported the cloning and characterization of five novel JNK2 transcript variants, which were designated as JNK2 α3, JNK2 α4, JNK2 β3, JNK2 γ1 and JNK2 γ2, respectively. Among them, JNK2 α4 and JNK2 γ2 are potential non-coding RNA because they contain pre-mature stop codons. Both JNK2α3 and JNK2β3 contain an intact kinase domain, and both encode a protein product of 46 kDa, the same as those of JNK2α1 and JNK2β1. JNK2γ1 contains a disrupted kinase domain and it showed a disable function. When over-expressed in mammalian cells, JNK2α3 showed higher activity on AP-1 than that of JNK2β3 and JNK2γ1. Furthermore, JNK2α3 and JNK2β3 showed different levels of substrate phosphorylation, although they both could promote the proliferation of 293T cells. Our results further demonstrate that JNK2 isoforms preferentially target different substrates and may regulate the expression of various target genes. [BMB reports 2010; 43(11): 738-743]
Modeling, Testing and Numerical Simulation on Hot Forming of HSS
Ning Ma Ping Hu,Guozhe Shen Wenhua Wu 한국소성가공학회 2010 기타자료 Vol.2010 No.6
The thermal-mechanical-transformation coupled relationship of microalloy steel has important significance in forming mechanism and numerical simulation of hot forming. Tensile and quenching experiments are implemented at high temperature, and then the thermal-mechanical-transformation coupled constitutive models of hot forming are developed. Based these models, the nonlinear large-deformation dynamic explicit finite element equations are proposed. The phase transformation latent heat is introduced into the analysis of temperature field during the hot forming process. Based on the independently developed commercial CAE software for sheet metal forming, named KMAS (King-Mesh Analysis System), the numerical simulation module of hot forming is developed, which considers multi-field coupled models, nonlinear and large deformation analysis. Then the hot forming process of a reinforced beam inside the automobile door is simulated by the KMAS software, and compared with its hot forming experimental testing. The experimental results indicate the validity and efficiency of the present multi-field coupled constitutive models and numerical simulation software KMAS of hot forming.
Positive solutions of a reaction-diffusion system with Dirichlet boundary condition
Zhan-Ping Ma,Shao-Wen Yao 대한수학회 2020 대한수학회보 Vol.57 No.3
In this article, we study a reaction-diffusion system with homogeneous Dirichlet boundary conditions, which describing a three-species food chain model. Under some conditions, the predator-prey subsystem ($u_{1}\equiv0 $) has a unique positive solution $\left( \overline{u_{2}},\overline{u_{3}} \right).$ By using the birth rate of the prey $r_{1}$ as a bifurcation parameter, a connected set of positive solutions of our system bifurcating from semi-trivial solution set $\left( r_{1},\left( 0,\overline{ u_{2}},\overline{u_{3}}\right) \right) $ is obtained. Results are obtained by the use of degree theory in cones and sub and super solution techniques.
Identification and Characterization of Protein Encoded by orf382 as L-Threonine Dehydrogenase
( Fei Ma ),( Tian Wen Wang ),( Xing Yuan Ma ),( Ping Wang ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.6
In the genome annotation of Escherichia coli MG1655, the orf382 (1,149 bp) is designated as a gene encoding an alcohol dehydrogenase that may be Fe-dependent. In this study, the gene was amplified from the genome by PCR and overexpressed in Escherichia coli BL21(DE3). The recombinant 6×His-tag protein was then purified and characterized. In an enzymatic assay using different hydroxyl-containing substrates (n-butanol, L-threonine, ethanol, isopropanol, glucose, glycerol, L-serine, lactic acid, citric acid, methanol, or D-threonine), the enzyme showed the highest activity on L-threonine. Characterization of the mutant constructed using gene knockout of the orf382 also implied the function of the enzyme in the metabolism of L-threonine into glycine. Considering the presence of tested substrates in living E. coli cel ls and previous literature, we believed that the suitable nomenclature for the enzyme should be an L-threonine dehydrogenase (LTDH). When using L-threonine as the substrate, the enzyme exhibited the best catalytic performance at 39°C and pH 9.8 with NAD+ as the cofactor. The determination of the Km values towards L-threonine (Km = 11.29 μM), ethanol (222.5 μM), and n-butanol (8.02 μM) also confirmed the enzyme as an LTDH. Furthermore, the LTDH was shown to be an ion-containing protein based on inductively coupled plasma-atomic emission spectrometry with an isoelectronic point of pH 5.4. Moreover, a circular dichroism analysis revealed that the metal ion was structurally and enzymatically essential, as its deprivation remarkably changed the α-helix percentage (from 12.6% to 6.3%).