Chinese EFL Learners’ Interpretation of Temporality in English

( Xiaoping Shen ),( Seung-man Kang ) 21세기영어영문학회 2020 영어영문학21 Vol.33 No.2

This paper delves into some properties of denoting temporality in Chinese in comparison with English and examines how Chinese EFL learners express the temporality of English sentences. For our discussion in this paper, we have conducted a survey of 200 Chinese college students majoring in English. They were asked to translate 12 English sentences into Chinese without adjunctive adverbials exhibiting temporal information. The results of the survey reveal that the subjects employ a variety of grammatical devices such as time adverbials, verbal aspects, future-oriented verbs, and modal verbs to represent temporality. This is mainly attributed to the fact that Chinese is typologically classified as an analytic language in which verbs lack morphological inflection for tense, and is thereby treated as a tenseless language. This in turn will lead to a host of errors in Chinese EFL learners’ language use in English.

Meso-scale model for calculating the stiffness of filament wound composites considering fiber undulations

Chuangshi Shen,Xiaoping Han 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.62 No.3

A meso-scale model is proposed to study filament-wound composites with fiber undulations and crossovers. First, the crossover and undulation region is classified as the circumferential undulation and the helical undulation. Next, the two undulations are separately regarded as a series of sub-models to describe the meso-structure of undulations by using mesoparameters such as fiber orientation, fiber inclination angle, resin rich area, fiber volume fraction and bundle cross section. With the meso-structure model and the classic laminate theory, a method for calculating the stiffness of filament wound composites is eventually established. The effects of the fiber inclination angle, the fiber and resin volume fraction and the resin rich area on the stiffness are studied. The numerical results show that the elastic moduli for the circumferential undulation region decrease to a great extent as compared with that of the helical undulation region. Moreover, significant decrease in the elastic and shear moduli and increase in the Poisson's ratio are also found for the resin rich area. In addition, thickness and bundle section have evident effect on the equivalent stiffness of the fiber crossover and the undulation region.

Fuzzy Adaptive Compensation Control for Space Manipulator with Joint Flexibility and Dead Zone Based on Neural Network

Jinmiao Shen,Wenhui Zhang,Shuhua Zhou,Xiaoping Ye 한국항공우주학회 2023 International Journal of Aeronautical and Space Sc Vol.24 No.3

Considering the problems of dead zone and flexibility in the joint transmission mechanism of space manipulator, a fuzzy compensation control method based on neural network is proposed. Dynamic equation of the system is established by the system’s linear and angular momentum conservation and Lagrange equation. Based on singular perturbation theory, it is decomposed into two subsystem models of fast variable and slow variable for control, respectively. A moment difference feedback controller is designed to suppress the elastic vibration for the fast-changing flexible subsystem model. Aiming at the unknown uncertainties in the slowly varying stiffness subsystem model, a radial basis function neural network controller is designed to approximate the unknown model and its approximation error is eliminated by a robust controller. Aiming at the dead zone link in the joint transmission mechanism, the mathematical relationship among dead zone estimation, dead zone compensator and controller is deduced. The dead zone estimator and dead zone compensator based on adaptive fuzzy system are designed to realize the online real-time estimation and compensation of dead zone, solving the tracking error caused by joint dead zone and improving the control accuracy. The parameter adaptive learning rate of the designed fuzzy system can realize online real-time adjustment without off-line learning stage. Based on Lyapunov theory, the uniform final boundedness of the signals of the whole closed-loop system is proved. Simulation results verify the effectiveness of the proposed control algorithm.

Korean and Chinese University EFL Learners’ Perceptions of and Attitudes toward Online and Face-to-Face Lectures During COVID-19

Seonmin Huh,Xiaoping Shen,Daliang Wang,Kang-Young Lee 한국영어교육학회 2022 ENGLISH TEACHING(영어교육) Vol.77 No.1

This study reports Chinese and Korean university EFL students’ perceptions of and attitudes toward online and face-to-face English language learning modes during COVID-19. Few previous studies have focused on how students thought of online and face-to-face learning experiences of subjects regarding new concept learning and delivery of new contents. Research gravitating around English courses showed students' mixed perceptions. The survey was conducted for 302 Korean and 337 Chinese university students who took communication-oriented English courses. Descriptive statistics and qualitative data analysis were used for analysis. Results indicated that students preferred face-to-face English learning with some specific indications of achieving a stronger help and quality for communicative competence in language. Online learning also benefited students with a sense of both flexibility and independence. Positive components of face-to-face learning for language education might be considered for online education while incorporation features such as flexibility and independence to enrich language education during COVID-19.

Partial gasification of coal in a fluidized bed reactor: Comparison of a laboratory and pilot scale reactors

Rui Xiao,Laihong Shen,Mingyao Zhang,Baosheng Jin,Yuanquan Xiong,Yufeng Duan,Zhaoping Zhong,Xiaoping Chen,Yaji Huang,Hongcang Zhou 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.1

Using DGPS as An Acceleration Sensor for Airborne Gravimetry

Kaidong Zhang,Lincheng Shen,Xiaoping Hu,Meiping Wu 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.1 No.-

In airborne gravimetry, there are two data streams. One is the specific force measured by an air/sea gravimeter or accelerometers, the other is kinematic acceleration measured by DGPS. And the difference of them provides the grav- ity disturbance information. To satisfy the requirement of most applications, an accuracy of 1mGal (1mGal=10-5m/s2) with a spatial resolution of 1km is the aim of current airborne gravimetry. There are two different methods to derive the kinematic acceleration. The generally used method is to differentiate the position twice, and the position can be calculated by commercial DGPS software. The main defect of this method is that integer ambiguities need to be fixed to get the precise position solution, but it’s not a trivial thing for long base line. And to fix integer ambiguities, the noisier iono-free measurement is used. When differentiation is applied, noise is amplified and will influence the accuracy of acceleration. The other method is to get carrier phase acceleration by differentiate the carrier phase first, and then using the ac- celeration of GPS satellite to derive the vehicle acceleration. The main advantages include that fixing integer ambi- guities is not needed anymore, position can be relaxed to about 10 meters, and smoother acceleration can be got since iono-free measurement is not needed. In some literatures, it’s considered that the dynamic performance of the second method is inferior to that of the first. Through analysis, it is found that the performance degradation in dynamic environment results from the simplifica- tion of the GPS carrier phase observable model. And an iterative algorithm is presented to compensate the model error. Using a dynamic GPS data from an aeromagnetic survey, the importance of this compensation is showed at last.

Ganodermanontriol Suppresses the Progression of Lung Adenocarcinoma by Activating CES2 to Enhance the Metabolism of Mycophenolate Mofetil

Qingfeng Xie,Zhuo Cao,Weiling You,Xiaoping Cai,Mei Shen,Zhangyong Yin,Yiwei Jiang,Xin Wang,Siyu Ye The Korean Society for Microbiology and Biotechnol 2024 Journal of microbiology and biotechnology Vol.34 No.2

New anti-lung cancer therapies are urgently required to improve clinical outcomes. Since ganodermanontriol (GDNT) has been identified as a potential antineoplastic agent, its role in lung adenocarcinoma (LUAD) is investigated in this study. Concretely, lung cancer cells were treated with GDNT and/or mycophenolate mofetil (MMF), after which MTT assay, flow cytometry and Western blot were conducted. Following bioinformatics analysis, carboxylesterase 2 (CES2) was knocked down and rescue assays were carried out in vitro. Xenograft experiment was performed on mice, followed by drug administration, measurement of tumor growth and determination of CES2, IMPDH1 and IMPDH2 expressions. As a result, the viability of lung cancer cells was reduced by GDNT or MMF. GDNT enhanced the effects of MMF on suppressing viability, promoting apoptosis and inducing cell cycle arrest in lung cancer cells. GDNT up-regulated CES2 level, and strengthened the effects of MMF on down-regulating IMPDH1 and IMPDH2 levels in the cells. IMPDH1 and IMPDH2 were highly expressed in LUAD samples. CES2 was a potential target for GDNT. CES2 knockdown reversed the synergistic effect of GDNT and MMF against lung cancer in vitro. GDNT potentiated the role of MMF in inhibiting tumor growth and expressions of CES2 and IMPDH1/2 in lung cancer in vivo. Collectively, GDNT suppresses the progression of LUAD by activating CES2 to enhance the metabolism of MMF.

Fabrication of N-doped Reduced Graphene Oxide/Ag3PO4 Nanocomposite with Excellent Photocatalytic Activity for the Degradation of Organic Pollutants

Longhai Feng,Lirong Kong,Zhenyuan Ji,Yi Wang,Xiaoping Shen 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.1

An efficient N-doped reduced graphene oxide (N-RGO)/Ag3PO4 nanocomposite with enhanced photocatalytic activity has been prepared through a facile solution-based approach. Since N-RGO could offer more sites for the anchoring of Ag3PO4 nanoparticles, and effectively promote the charge carriers separation and transfer due to its high electrical conductivity, the photocatalytic activity of N-RGO/Ag3PO4 nanocomposite is much higher than bare Ag3PO4 and N-RGO in the degradation of phenol pollutant under simulated solar light irradiation. The mechanism for the photocatalytic process was also investigated. The excellent photocatalytic performance makes the N-RGO/Ag3PO4 nanocomposite a promising photocatalyst for organic pollutant treatment.

Co–Fe Bimetal Phosphate Composite Loaded on Reduced Graphene Oxide for Oxygen Evolution

Guoxing Zhu,Xulan Xie,Lisong Xiao,Xiaoyun Li,Xiaoping Shen,Yuanjun Liu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.1

Development of high-performance nonprecious metal-based catalysts for oxygen evolution reaction (OER) is crucial to improve the efficiency of water electrolysis and photoelectrochemical water splitting for harvesting and storage of solar energy. Herein, Co–Fe phosphates and their composites with reduced graphene oxide (rGO) were prepared by a simple hydrothermal method, which then acted as oxygen evolution reaction catalysts. In 1.0 M KOH aqueous solution, the as-obtained optimal composite, Co–Fe phosphate/rGO, can catalyze oxygen evolution reaction with a very sharp onset potential and a small over-potential of 338 mV to achieve a current density of 10 mA cm -2. It was found that in these Co–Fe phosphates, the optimal Co:Fe ratio is 0.75:0.25. The excellent electrocatalytic performance of the Co–Fe phosphate/rGO composite would benefit from the synergistic effects between Fe and Co species, as well as rGO substrate providing conductive channels. The formed Co–Fe phosphate/rGO electrocatalysts can be the promising replacement of precious metal-based catalysts for more practical and cost-efficient water splitting.