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Minghui Liu,Jiasheng Wang,Yingcen Liu,Rongwen Lu,Shufen Zhang 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.10
We report the facile synthesis of small gold nanoparticles stabilized by carbon nanospheres (Au@C) for highly active and selective hydrogenation of 4-nitrobenzaldehyde. The formation of such a Au@C unique structure can be attributed to the high distribution of Au(III) species in the melamine-formaldehyde resin nanospheres, which were formed via the coordination of Au(III) with the abundant imino groups of melamine-formaldehyde pre-polymer. After the subsequent condensation and confined in situ reduction, small gold nanoparticles, and carbon nanospheres were formed simultaneously. Under the reaction conditions of 80 °C and 1.6 MPa, 99.3% conversion and >99% selectivity were achieved for the hydrogenation of 4-nitrobenzaldehyde to 4-aminobenzaldehyde.
Minghui Li 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.11
Smart home contains all the living functions of the traditional home, and provides a more safe, comfortable and high-tech home space. With the development and popularization of multimedia technology, computer technology has been applied to music classroom, laboratory, music hall, almost all aspects of music teaching and research. In this paper, the author analyzes smart home education and multimedia network teaching platform in piano music education. Multimedia combined with different teaching characteristics, through the modern media as the carrier of the communication channels, then process the formation of vivid images or sounds of music. Along with the digital process of music classroom, computer music workstations, multimedia, distance learning, portable music systems, online interactive music creation, and other technologies are being popularized.
Minghui Chu,Jizheng Chu 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.5
Tuning parameters of the PID controller which satisfying certain requirements is the key goal in uncertain systems. However, most studies ignored the disturbance rejection performance of the controller. This study investigated a novel graphical design method of improving disturbance rejection performance for uncertain system. The proposed method evaluates the disturbance rejection performance by analyzing reference to disturbance ratio (RDR). At the same time, the parameters of the controller which can stabilize the system and meet the robustness specification for the uncertain system are determined by specifications-oriented Kharitonov region (SOKR). Thus, the intersection region satisfying multiple objectives can be found by using this graphical method. Examples are given to demonstrate the flexibility and effectiveness of the proposed method.
Stability of Limiting Zeros of Sampled-data Systems with Backward Triangle Sample and Hold
Minghui Ou,Shan Liang,Cheng Zeng 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.8
The backward triangle sample and hold (BTSH) is a novel sample and hold function. This paper concentrated on the stability of zeros in the sampled-data system that arising from the case of a BTSH and a continuoustime system in cascade. The properties and stable conditions of the limiting zeros for sufficiently small or large sampling period in BTSH case are displayed. The framework of the limiting zeros is derived in the two different sampling rates. It is demonstrated that one can choose a suitable parameter value of BTSH, where the limiting zeros of the resulting sampled-data system can be located inside the stable region while the zero order hold (ZOH) fails to do. Finally, numerical examples are provided to better show proposed theories in this paper.
Iterative algorithms for the least-squares symmetric solution of AXB=C with a submatrix constraint
Minghui Wang,Yan Feng 한국전산응용수학회 2009 Journal of applied mathematics & informatics Vol.27 No.1
Iterative algorithms are proposed for the least-squares sym- metric solution of AXB = E with a submatrix constraint. We charac- terize the linear mappings from their independent element space to the constrained solution sets, study their properities and use these properties to propose two matrix iterative algorithms that can find the minimum and quasi-minimum norm solution based on the classical LSQR algorithm for solving the unconstrained LS problem. Numerical results are provided that show the efficiency of the proposed methods. Iterative algorithms are proposed for the least-squares sym- metric solution of AXB = E with a submatrix constraint. We charac- terize the linear mappings from their independent element space to the constrained solution sets, study their properities and use these properties to propose two matrix iterative algorithms that can find the minimum and quasi-minimum norm solution based on the classical LSQR algorithm for solving the unconstrained LS problem. Numerical results are provided that show the efficiency of the proposed methods.
Minghui Jin,Sang Hwan Hyun 한국수정란이식학회 2017 한국수정란이식학회 학술대회 Vol.2017 No.05
Lysophosphatidic acid (LPA) is an important signaling molecule which mediates many different cellular responses. The purpose of this study was to investigate the effect of in vitro culture (IVC) medium supplemented with LPA on the preimplantation embryonic development of porcine embryos derived from in vitro fertilization (IVF). Embryos derived from IVF were cultured in PZM-3 medium supplemented with 30 μM LPA on Day 1 to Day 7, Day 1 to Day 3 (early stage), or Day 4 to Day 7 (late stage), or without LPA. Moreover, the messenger RNA (mRNA) expression of obtaining blastocysts from each group were analyzed. Data were analyzed by ANOVA followed by Duncan using SPSS (Statistical Package for Social Science) mean ± SEM. There was a significantly higher cleavage rate in Day 1 to Day 7 than control (71.25% and 57.46%, respectively) and significantly higher total cell number of blastocysts in Day 1 to Day 3 and Day 4 to Day 7 than control (56.07,56.53 and 45.19, respectively). The results also showed that the mRNA expression level of PCNA, Bcl-2 and Bax in Day 1 to Day 7 group blastocysts were significantly higher than control and the expression level of Bax in Day 1 to Day 3 was also significantly higher than control. Moreover, it also showed that Bcl-2/Bax mRNA ratio in D1-3 group was significantly lower than control but D4-7 and D1-7 groups were comparable to control group. In conclusion, our results suggest that treatment with 30 μM LPA during IVC improves the porcine early embryo cleavage and the blastocyst total cell number after IVF and regulating the mRNA expression of blastocysts during blastocyst formation.
Minghui Jin,유일정,전유별 사단법인 한국동물생명공학회 2017 한국동물생명공학회지 Vol.32 No.4
Lysophosphatidic acid (LPA) is an important signaling molecule. Here, the effect and mechanism of LPA on the preimplantation development of porcine embryos during in vitro culture (IVC) was examined. Porcine embryos were cultured in porcine zygote medium (PZM-3) supplemented with 30 μM LPA during different days. There was a significantly higher cleavage rate in Day 1-7 and significantly higher total cell number of blastocysts in Day 1-3 and Day 4-7. It was also found that messenger RNA (mRNA) expression level of PCNA, BCL2 and BAX in blastocysts obtained from D1-7 group were significantly higher and BCL2/BAX mRNA ratio in D1-3 group was significantly lower than control group but Day 4-7 and Day 1-7 groups were comparable with control group. Treatment with 20 μM PLC inhibitor significantly decreased the embryo cleavage rate and blastocyst formation rate. Moreover, LPA as an activator of PLCs, enhanced the 30 μM LPA + 20 μM U73122 group embryo cleavage rate which similar with control group. In conclusion, the results suggest that treatment with LPA during IVC improves the porcine early embryo cleavage by activation of PLC signaling pathway and regulate the mRNA expression that contribute to total cell number of blastocysts during blastocyst formation.