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Jin, Zheng,Ren, Yanyan,Li, Guangyuan 한중경제문화학회 2016 한중경제문화연구 Vol.6 No.-
This study discusses several issues which are very important in worldwide mergers and acquisitions, such as cultural differences, culture clashes, operating results and financial quality. A case of SAIC Motor's acquisition of Ssangyong Motor is examined. For this study, 20 financial ratios are used to calculate the financial quality of SAIC in the post-acquisition integration. The result shows that cultural differences possibly have a negative effect on post-acquisition integration and cultural clashes are the root cause of the financial quality plummet. The suggestions are also provided that top managers should pay much more attention to the negative effects of cultural clashes and strengthen cultural integration.
Finite-time Consensus of Networked Euler-Lagrange Systems via STA-based Output Feedback
Yanyan Fan,Zhenlin Jin,Baosu Guo,Xiaoyuan Luo,Xinping Guan 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.9
The consensus problem based on full state feedback has been extensively studied, but rarely for leaderless distributed finite-time consensus of networked Euler-Lagrange systems based on output-feedback. In this work, the finite-time consensus problem of networked Euler-Lagrange systems subject to unknown velocity is studied. A finite-time consensus protocol is first proposed based on the relative positions and velocities. Then, the more challenging situation of networked Euler-Lagrange systems subject to unmeasurable velocity is considered. A model-independent observer based on the super-twisting algorithm (STA) is developed for velocity error estimation, based upon which a finite-time output feedback control protocol is developed for consensus of the networked EulerLagrange systems. Stability analysis shows that the networked Euler-Lagrange systems can achieve consensus in finite time. Finally, numerical simulations are conducted to demonstrate the effectiveness of the proposed control algorithms.
Jin Guangze,Yanyan Liu,Shuang Liu,Ji Hong Kim 한국생태학회 2007 Journal of Ecology and Environment Vol.30 No.4
Recognizing the ecological importance of forest gap formation for forest community structure, we examined the differences in species diversity between forest gaps and closed canopy areas for trees and shrubs in three developmental stages (seedling, saplingⅠ, and saplingⅡ) in a typical mixed broadleaved-Korean pine forest. We randomly placed 100 sample plots (2×2 m for seedling and saplingⅠ, and 5×5 m for saplingⅡ) in forest gap and closed canopy areas of a 9 ha permanent sample plot for vegetation surveys of plants of each developmental stage in each habitat type. Even though the formation of forest gaps encouraged the occurrence of gap-dependent species and increased overall species diversity, there were no significant differences in species richness among the three developmental stages for both tree and shrub species (p>0.05). Comparing the two types of sites, statistical tests revealed no difference in species richness for trees, but highly significant differences (p<0.01) between forest types for shrubs for seedlings and saplingⅠ, but not saplingⅡ. Analysis of variance test indicated that there were no significant differences in species diversity among the three developmental stages of tree species (p>0.05) for both Simpson and Shannon indices. The variance for shrub seedlings was significantly different between forest gaps and closed canopy areas, but not for saplingⅠ and saplingⅡ. The analysis showed that the species diversity in forest gaps was significantly different from that of closed canopy areas for seedling and saplingⅠ (p<0.01), but not for saplingⅡ (p>0.05).
Xinyu Guan,Yanyan Hu,Zengwang Jin,Kaixiang Peng 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.10
This paper is focused on the finite-time sliding mode fault-tolerant control problem for a class of discrete networked control systems with intermittent fault and time-varying delay under the event-triggered scheme. The intermittent fault is described as a randomly occurring fault obeying a Bernoulli distribution. The event-triggered mechanism is introduced to determine the transmission of signal, which can conserve communication resources and reduce network burdens. By means of the sliding mode observer method, a linear sliding mode function is constructed by employing the estimated state and fault information. Based on Lyapunov stability theory, sufficient criteria are derived, which can ensure the closed-loop system is finite-time bounded with pre-specified H∞ performance requirement satisfied. Then, the event-triggered observer-based sliding mode fault-tolerant controller is established to force the system state trajectories onto a pre-set sliding mode region. Afterward, the solvability of the non-convex problem is studied by testifying the feasibility of a minimization problem. Finally, a practice simulation result is provided to illustrate the effectiveness of the proposed theoretical results.
Wang, Jing,Bu, Yanyan,Wang, Xiangfu,Seo, Hyo Jin Elsevier 2018 Optical materials Vol.84 No.-
<P><B>Abstract</B></P> <P>Optical thermometry based on the adjacent thermally coupled levels of rare earth ions has been widely studied in the high temperature range, and shows unobvious effect at low temperature range. In this work, we propose a new method to achieve optical thermometry in 10˜300 K range through manipulating the energy transfer from WO<SUB>6</SUB> <SUP>6−</SUP> to Ho<SUP>3+</SUP>. A comprehensive five-level rate-equation model is developed to establish the relation between lifetime ratios and temperature. It is found that the lifetime ratios of 540 nm (Ho<SUP>3+</SUP>) and 471 nm (WO<SUB>6</SUB> <SUP>6−</SUP>) emissions are dependent on the phonon energy of Y<SUB>2</SUB>WO<SUB>6</SUB> host and temperature. The values of sensor sensitivity reach the maximum 2.1% K<SUP>−1</SUP> at 211 K in 30%Ho<SUP>3+</SUP> doped Y<SUB>2</SUB>WO<SUB>6</SUB>, which is higher than the maximum of the reported phosphors at low temperature. It overcomes the shortcoming of unobvious thermal population of thermally coupled levels in low temperature range through traditional Boltzmann distributing method.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Energy transfer process between host and Ho<SUP>3+</SUP> was analyzed. </LI> <LI> Temperature dependent emission spectra of Ho<SUP>3+</SUP> doped Y<SUB>2</SUB>WO<SUB>6</SUB> were studied. </LI> <LI> A new method to achieve optical thermometry through manipulating the energy transfer from WO<SUB>6</SUB> <SUP>6−</SUP> to Ho<SUP>3+</SUP> is proposed. </LI> </UL> </P>
Valley V² Control Technique for Switching Converters with Fast Transient Response
Guohua Zhou,Jianping Xu,Jin Sha,Yanyan Jin 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Valley V² control technique for switching converters is proposed in this paper. By utilizing output voltage ripple as pulse-width modulation ramp and valley voltage of output voltage ripple as additional control variable, valley V² control technique provides faster load transient response than conventional current-mode control techniques. Steady-state and transient performances of switching converters with valley V² control, peak V² control, and current-mode control are compared and verified by experimental results.
Xihong Zhao,Li Wang,Jin Chu,Yanmei Li,Yanyan Li,Zhenbo Xu,Lin Li,Mark E. Shirtliff,Xiaowei He,Yao Liu,Jihua Wang,Liansheng Yang 한국식품과학회 2010 Food Science and Biotechnology Vol.19 No.6
A loop-mediated isothermal amplification (LAMP) method for rapid detection of the food-borne Salmonella strains had been developed and evaluated in this study. The optimal reaction condition was found to be 65℃ for 45 min, with the detection limit as 1 pg DNA/tube and 100 CFU/reaction. Application of LAMP assays was performed on 214 food-borne Salmonella strains using a rapid procedure and easy result confirmation, where the specificity of LAMP and polymerase chain reaction (PCR)assays was 97.7% (209/214) and 91.6% (196/214),respectively; with a 100% specificity for both assays.
Xihong Zhao,Li Wang,Jin Chu,Yanyan Li,Yanmei Li,Lin Li,Mark E. Shirtliff,Xiaowei He,Yao Liu,Jihua Wang,Liansheng Yang,Zhenbo Xu 한국식품과학회 2010 Food Science and Biotechnology Vol.19 No.5
A loop-mediated isothermal amplification (LAMP) method for rapid detection of the foodborne Vibrio parahaemolyticus strains and related virulent factors had been developed and evaluated in this study. Six primers, including outer primers, inner primers, and loop primers, were specially designed for recognizing 8 distinct sequences on 3 target genes, which were tlh, tdh, and trh. The detection limits were found to be 100, 100 fg, and 1 pg DNA/tube for tlh, tdh, and trh, respectively. Application of LAMP assays were performed on 368 foodborne V. parahaemolyticus strains, the sensitivities of LAMP assays for the tlh, tdh, and trh were 100, 95.6, and 96.4%, and the negative predictive values (NPV) were 100, 84.7, and 93.1%, respectively; with a 100% specificity and positive predictive value (PPV) for all 3 target genes.
Wang, Xiangfu,Bu, Yanyan,Yan, Xiaohong,Cai, Peiqing,Wang, Jing,Qin, Lin,Vu, Thiquynh,Seo, Hyo Jin OPTICAL SOCIETY OF AMERICA 2016 Optics letters Vol.41 No.22
<P>Understanding site-selective fluorescence is one of valuable importance for spectrum modulation. In this Letter, we observed the existence of two non-equivalent Gd-activated crystallographic sites in an Er3+-doped hexagonal Na1.5Gd1.5F6 phosphor. It is proved that two green emissions from the S-4(3/2) level separately originate from the Gd1 (540 nm) and Na2/Gd2 (550-555 nm) crystallographic sites, and the 657 nm red emission from the F-4(9/2) level only originates from Na2/Gd2 site through using the time-resolved luminescence spectra. The 142.2% absolute enhancement of the red emission is realized through the synergistic effect of ultraviolet downconversion and infrared upconversion induced by the 370 nm and 1.54 mu m dual-mode excitation. (C) 2016 Optical Society of America</P>
Double-voltage vector-based model predictive control for three-phase grid-connected AC/DC converters
Guo, Leilei,Zhang, Kaixuan,Li, Yanyan,Jin, Nan The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.1
This paper presents a double-vector-based model predictive control method for three-phase grid-connected AC/DC converters. The conventional model predictive control (MPC) presents high steady-state ripples due to the application of only one voltage vector during one control period. To reduce the current ripples, a new MPC method is proposed. Double-voltage vectors are selected and applied it each control period in the proposed method. To reduce the calculation burden, the duration time of each voltage vector is calculated based on the principle of modulated MPC. Furthermore, the effectiveness of the proposed double-voltage vector-based MPC strategy is analyzed in theory for the first time. Then, it is further verified by comparative experiment studies.