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Stability and Stabilization of Stochastic Systems with Multiplicative Noise
Huiying Sun,Meng Li,Weihai Zhang 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.2
In this paper, stability and stabilization of linear stochastic time-invariant systems are studied based on spectrum technique. Firstly, the relationship among mean square exponential stability, asymptotical mean square stability, second-order moment exponential stability and the spectral location of the systems is revealed with the help of a spectrum operator LA,C. Then, we focus on almost sure exponential stability and stochastic stabilization. A criterion on almost sure exponential stability based on spectrum technique is obtained. Sufficient conditions for mean square exponentially stability and asymptotic mean square stability are given via linear matrix inequality approach and some numerical examples to illustrate the effectiveness of our results are presented.
An investigation of twenty-first century learners’ competencies in China
Huiying Cai,Xiaoqing Gu,Lung-Hsiang Wong 서울대학교 교육연구소 2017 Asia Pacific Education Review Vol.18 No.4
This paper reports a study on developing an assessment inventory of Chinese learners’ competencies as needed for the twenty-first century. In creating the instrument, three relevant twenty-first century competency frameworks were referenced: from the OECD, the European Council, and the USA. The preliminary version of this instrument, which consists of 55 items, was administered to 732 Shanghai students from three types of K-12 schools. To investigate the factors and the structure of the competencies that young Chinese learners’ in the twenty-first century should possess, exploratory factor analysis and structural equation modeling were employed. This resulted in a selection of 42 items in seven categories. These were conceptions of learning, competencies in ICT, problem solving, communication, critical thinking, cross-cultural communication, and advanced-level literacy. Based on these findings, the status of students’ twenty-first century competencies in Shanghai, were investigated in relation to gender, region, and grade. The implications of the findings were discussed, such as balancing the learning resource and teacher deployment in differently developed regions, as well as guiding the implementation of a competency-based curriculum in China.
An improved Corten-Dolan’s model based on damage and stress state effects
Huiying Gao,Hong-Zhong Huang,Zhiqiang Lv,Fang-Jun Zuo,Hai-Kun Wang 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.8
The value of exponent d in Corten-Dolan’s model is generally considered to be a constant. Nonetheless, the results predicted on thebasis of this statement deviate significantly from the real values. In consideration of the effects of damage and stress state on fatigue lifeprediction, Corten-Dolan’s model is improved by redefining the exponent d used in the traditional model. The improved model performsbetter than the traditional one with respect to the demonstration of a fatigue failure mechanism. Predictions of fatigue life on thebasis of investigations into three metallic specimens indicate that the errors caused by the improved model are significantly smaller thanthose induced by the traditional model. Meanwhile, predictions derived according to the improved model fall into a narrower dispersionzone than those made as per Miner’s rule and the traditional model. This finding suggests that the proposed model improves the life predictionaccuracy of the other two models. The predictions obtained using the improved Corten-Dolan’s model differ slightly from thosederived according to a model proposed in previous literature; a few life predictions obtained on the basis of the former are more accuratethan those derived according to the latter. Therefore, the improved model proposed in this paper is proven to be rational and reliable giventhe proven validity of the existing model. Therefore, the improved model can be feasibly and credibly applied to damage accumulationand fatigue life prediction to some extent.
Isophorone derivative as red dopant for organic electroluminescent devices
Huiying Fu,Huanrong Wu,Xiaoyuan Hou,Fei Xiao,Bingxian Shao 한국물리학회 2007 Current Applied Physics Vol.7 No.6
The donoracceptor functionalized molecule, bis(4-(2-(3,3-dicyanomethylene-5,5-dimethyl-1-cyclohexylidene)vinyl)phenyl)(1-naph-thyl)amine (DPN-4CN), with symmetrical structure, was investigated for its application in optoelectronic devices. Red organic light-emitting diodes (OLEDs) were fabricated by doping DPN-4CN in tris(8-hydroxyquinolino) aluminum (Alq3) as red emitters, with astructure of ITO/NPB/Alq3:DPN-4CN/BCP/Alq3/LiF/Al. The device with a doping concentration of 2.5 wt% showed pure red emissionwithkmax . 2 at a driving voltage of 12 V, a current eciencyof 2.14 cd A. 1 and an external quantum eciency of 1.07% at a current density of 20 mA cm. 2. The current eciencies and CIE coor-dinates of the device were almost constant over a current density from 1 to 200 mA cm. 2.
Interaction between Metalloporphyrins and Diazine Tautomers
Huiying Xu,Wei Wang,Jianqing Zhu,Xiaolu Xu,Deyong Zhang 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.12
The interaction between metalloporphyrins and diazine tautomers was investigated using quantum chemistry method. The results showed that the metal atom in the metalloporphyrin was not coplanar with porphin ring, and zinc porphyrin has the most extent of its non-coplanar nature. The most stable complex in nine complexes was iron porphyrin. NBO analysis indicated that the interaction between the lone pair of electrons on the nitrogen atom and the unoccupied lone pair orbital of metal contributes significantly to the stability of the complexes. Through the conceptual DFT parameter and Fukui dual descriptor, the thermodynamic stability and reactivity of complexes were analyzed. The density difference function (DDF) analyzes were performed to explore the rearrangement of electronic density after the coordination interaction. NICS calculation indicated that metalloporphyrin aromaticity was reduced after the coordination interaction, and aromaticity of diazine tautomer was increased along direction vector of the coordination interaction force.
Huiying Sun,Liuyang Jiang,Weihai Zhang 제어·로봇·시스템학회 2012 International Journal of Control, Automation, and Vol.10 No.5
In this paper, we consider the feedback control on nonzero-sum linear quadratic (LQ) differential games in finite horizon for discrete-time stochastic systems with Markovian jump parameters and multiplicative noise. Four-coupled generalized difference Riccati equations (GDREs) are obtained, which are essential to find the optimal Nash equilibrium strategies and the optimal cost values of the LQ differential games. Furthermore, an iterative algorithm is given to solve the four-coupled GDREs. Finally, a suboptimal solution of the LQ differential games is proposed based on a convex optimization approach and a simplification of the suboptimal solution is given. Simulation examples are presented to illustrate the effectiveness of the iterative algorithm and the suboptimal solution.
Huiying Chen,Weifeng Xia,Zheng-Guang Wu,Zuxin Li 제어·로봇·시스템학회 2024 International Journal of Control, Automation, and Vol.22 No.3
This article is primarily concerned with the collaborative optimization design issue of the asynchronousfilter and the event-based trigger for discrete-time nonlinear Markov jump systems modeled by the Takagi-Sugenofuzzy model. In the network environment, an event-based trigger is introduced to reduce communication consumption while the hidden Markov model approach is utilized to express the asynchronous phenomenon between thefilter and the plant. Based on this framework, using the parameter-dependent Lyapunov function and matrix inequality techniques, the H∞ and L2 −L∞ asynchronous filter design schemes are developed such that the resultingfiltering error dynamic system can be randomly mean square stable and satisfy a preset noise attenuation performance. Furthermore, an iterative optimization algorithm is presented to collaboratively solve the optimal parametersof the filter and the trigger. At last, a tunnel-diode circuit is employed to verify the validity of our design schemes.
Effect of Probiotics on Central Nervous System Functions in Animals and Humans: A Systematic Review
( Huiying Wang ),( In-seon Lee ),( Christoph Braun ),( Paul Enck ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2016 Journal of Neurogastroenterology and Motility (JNM Vol.22 No.4
To systematically review the effects of probiotics on central nervous system function in animals and humans, to summarize effective interventions (species of probiotic, dose, duration), and to analyze the possibility of translating preclinical studies. Literature searches were conducted in Pubmed, Medline, Embase, and the Cochrane Library. Only randomized controlled trials were included. In total, 38 studies were included: 25 in animals and 15 in humans (2 studies were conducted in both). Most studies used Bifidobacterium (eg, B. longum, B. breve , and B. infantis ) and Lactobacillus (eg, L. helveticus , and L. rhamnosus ), with doses between 10<sup>9</sup> and 10<sup>10</sup> colonyforming units for 2 weeks in animals and 4 weeks in humans. These probiotics showed efficacy in improving psychiatric disorderrelated behaviors including anxiety, depression, autism spectrum disorder (ASD), obsessive-compulsive disorder, and memory abilities, including spatial and non-spatial memory. Because many of the basic science studies showed some efficacy of probiotics on central nervous system function, this background may guide and promote further preclinical and clinical studies. Translating animal studies to human studies has obvious limitations but also suggests possibilities. Here, we provide several suggestions for the translation of animal studies. More experimental designs with both behavioral and neuroimaging measures in healthy volunteers and patients are needed in the future.
Huiying Cui,Feng Liang,Chao Ma,Ningning Zhong,Yuliang Sha,Wei Ma 한국지질과학협의회 2019 Geosciences Journal Vol.23 No.4
Although there are many similarities between the shale of Cambrian Qiongzhusi Formation and Ordovician Wufeng Formation–Silurian Longmaxi Formation in South China, including total organic carbon content (TOC) and thickness, the drilling results of shale gas exploration are very different. One of the reasons is the difference of the nano-pores number developed in organic matter between them. In order to reveal the causes, the black shale of Upper Proterozoic Xiamaling Formation in North China, which is similar to the marine source rock in Sichuan basin, was selected for the thermal simulation experiment, and the pore size and volume of the samples before and after the experiment were acquired by scanning electron microscopy (SEM) and nitrogen adsorption isotherm measurement. Through the SEM photographs, we found that the sizes of the organic pores in algae, dispersed organic matter and organic matter associated with clay minerals get bigger with the increasing maturity. The total pore volume, micro-pore volume and meso-pore volume of the shale acquired by nitrogen adsorption isotherm measurement increase with the increasing maturity, too. However, under the overburden pressure, micro-pore volume decreases at high maturity stage, indicating the pores in organic matter might be compressed. It is considered that the pore volume in organic matter of the shale of Qiongzhusi Formation might be compacted under greater confining pressure, which may be the reason why the pore structures of the two sets of marine shale in South China are different.