재한 중국인 유학생의 문화적응 스트레스와 대학생활적응의 관계에서 희망의 매개효과

유아신(LIU, YAXIN),최아론(Choi, A-ron) 한국교육치료학회 2021 교육치료연구 Vol.13 No.1

본 연구는 전라북도 지역 소재의 대학교에 재학중인 중국인 유학생 497명을 대상으로 문화적응 스트레스와 대학생활적응의 관계에서 희망의 매개효과를 살펴보았다. 인구통계학적 특성에 따른 대학생활적응의 차이가 있는지를 확인하기 위해 독립표본 t-test와 분산분석을 실시하였고 사후검정으로 Scheffe을 사용하였다. 연구 검증을 위해 연구변인들 간의 상관관계를 분석하고, Process Macro를 통해 매개효과를 검증하였다. 그 결과 첫째, 중국 유학생의 대학생활적응은 나이, 체류기간, 신분, 한국어 능력에 따라 유의미한 차이를 보였지만 성별에 따라서는 유의미한 차이를 보이지 않았다. 둘째, 문화적응 스트레스는 희망, 대학생활적응과 유의미한 부적 상관을 보였으나 희망과 대학생활적응은 유의미한 정적상관을 보였다. 셋째, 중국 유학생의 문화적응 스트레스와 대학생활적응의 관계에서 희망의 부분 매개효과를 검증하였다. 이와 같은 본 연구의 결과는 중국인 유학생이 어느 부분에서 주된 스트레스를 받고 있는지 확인하여 스트레스 수준을 낮추고 보다 더 효율적인 대학생활을 할 수 있도록 적응 수준을 향상시킬 수 있는 개인이나 집단상담 프로그램 개발에 활용하고자 한다. This study examined the mediation effect of hope in the relationship between acculturative stress and university life adaptation among 497 Chinese students based in Jeollabuk-do. Independent sample t-test and analysis of variance were conducted to check if there were differences in university life adaptation according to demographic characteristics, and Scheffe was used as a follow-up test. Correlation among research variables was analyzed for research verification, and the mediation effect was verified through Process Macro. The results of the study are as follows. Firstly, the adjustment of Chinese students to university life in Korea showed significant differences depending on their age, length of stay, status, and Korean language ability. Still, there was no significant difference depending on the gender of Chinese students in Korea. Secondly, the cultural adaptation stress showed a significant amulet correlation with hope, university student adaptation, and a significant amulet. However, there was a significant static correlation between hope and university life adaptation. Thirdly, the partial mediation effect of hope was verified in the relationship between cultural adaptation stress and university life adaptation of Chinese students in Korea. The results of this study will be used to develop counseling programs that can help Chinese students in Korea experience major stress and improve their level of adaptation so that they can lower their stress levels and have a more efficient college life.

Enhanced catalyst activity by decorating of Au on Ag@Cu₂O nanoshell

Chen, Lei,Liu, Maomao,Zhao, Yue,Kou, Qiangwei,Wang, Yaxin,Liu, Yang,Zhang, Yongjun,Yang, Jinghai,Jung, Young Mee Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.435 No.-

<P><B>Abstract</B></P> <P>We successfully synthesized Au-decorated Ag@Cu<SUB>2</SUB>O heterostructures via a simple galvanic replacement method. As the Au precursor concentration increased, the density of the Au nanoparticles (NPs) on the Ag@Cu<SUB>2</SUB>O surface increased, which changed the catalytic activity of the Ag@Cu<SUB>2</SUB>O-Au structure. The combination of Au, Ag, and Cu<SUB>2</SUB>O exhibited excellent catalytic properties, which can further effect on the catalyst activity of the Ag@Cu<SUB>2</SUB>O-Au structure. In addition, the proposed Ag@Cu<SUB>2</SUB>O-Au nanocomposite was used to transform the organic, toxic pollutant, 4-nitrophenol (4-NP), into its nontoxic and medicinally important amino derivative via a catalytic reduction to optimize the material performance. The proposed Au-decorated Ag@Cu<SUB>2</SUB>O exhibited excellent catalytic activity, and the catalytic reduction time greatly decreased (5 min). Thus, three novel properties of Ag@Cu<SUB>2</SUB>O-Au, i.e., charge redistribution and transfer, adsorption, and catalytic reduction of organic pollutants, were ascertained for water remediation. The proposed catalytic properties have potential applications for photocatalysis and localized surface plasmon resonance (LSPR)- and peroxidase-like catalysis.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Au-decorated Ag@Cu<SUB>2</SUB>O heterostructures via a simple galvanic replacement method were designed. </LI> <LI> We can easily control the density of the Au NPs on Ag@Cu<SUB>2</SUB>O by changing the concentration of the Au precursor. </LI> <LI> Ag@Cu<SUB>2</SUB>O-Au nanomaterials with high absorption exhibited significantly enhanced catalytic activity for 4-NP. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Numerical analysis of thermal dynamics and mixing performance in the blade-type static mixers

Yanfang Yu,Yaxin Chen,Huibo Meng,Yunjuan Yao,Dongzhou Liu,Jianhua Wu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.7

The turbulent thermal dynamics and mixing performance of kenics static mixer (KSM), lightnin static mixer (LSM) and Q-type static mixer (QSM) were numerically simulated with uniform heat flux within the range of Reynolds numbers (Re) between 6000 and 30000. The numerical predictions of Nusselt number (Nu) and friction coefficient (f) in KSM were well consistent with the experimental data. The dean vortices, thermal resistance, entropy generation and field synergy were fully analyzed to obtain the enhancement mechanism of heat transfer performance. The synergy performance between temperature gradient and flow field firstly decreased and then increased and are superior to that of KSM with increasing Re. With the same Re, the entropy generation rates of LSM are 0.93-0.94 times that of QSM. LSM is a better alternative consideration for convection mixing and heat transfer enhancement. Two new relationships between Nu and f under different dimensionless uniform heat flux are obtained.

Graphene Enhanced Electrical Properties of Polyethylene Blends for High-Voltage Insulation

Zuojun Wei,Yaxin Hou,Chen Jiang,Haiyan Liu,Xiangrong Chen,Anyun Zhang,Yingxin Liu 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.5

Graphene as a novel additive in low density polyethylene (LDPE), high density polyethylene–low density polyethylene blend(10%HDPE–LDPE) and polypropylene–low density polyethylene blend (10%PP–LDPE), is investigated for promising ecofriendlyinsulating materials in high voltage cables. The composites with graphene amounts of 0, 0.002 wt%, 0.02 wt%,and 0.2 wt% are prepared by the solution mixing method. With attempt to disclose the structure–property relationships, thecomposites are extensively characterized by physical techniques including Fourier transform infrared spectroscopy, X-raydiffraction, atomic force microscopy, transmission electron microscopy, scanning electron microscopy, thermogravimetricanalysis and differential scanning calorimetry, and electrical measurements including electrical treeing, direct current conductivityand space charge distributions. Results show that graphene can significantly enhances the thermal stability of LDPEand 10%PP–LDPE, slightly decrease the degree of crystallinity, change the size of the crystal diameters, and improve thephase distribution of the polymer blends. Consequently, graphene can prolong the electrical tree initiation time and blockthe extension of electrical tree. Besides, it can modulate the trap distributions, which will further change the conductivityand ability to suppress space charge accumulations. This excellent performance of graphene could be attributed to its goodexfoliation, uniform dispersion and outstretched morphology in the polymer matrix, as well as its strong ability to captureelectrons.

A Performance Investigation and Comparison of Line Start-up Permanent Magnet Synchronous Motor with Super Premium Efficiency

Feng, Xueqing,Bao, Yaxin,Liu, Lijun,Huang, Lizhong,Zhang, Yingming Journal of International Conference on Electrical 2012 Journal of international Conference on Electrical Vol.1 No.2

This paper presents the performance investigation and design technology of a Line Start-up Permanent Magnet Synchronous Motor (LSPMSM) with super premium efficiency, including a design consideration and evaluation for motor start-up, key performance, and advanced finite element analysis FEA) for the design, improvement and verification, prototype build and test, design and test data comparison with a $Premium^{(R)}$ Efficient Induction Motor (PEIM). To assess the design technology, the LSPMSM prototype was built amended from a PEIM with the same frame, stator punching and rated output. Based on the prototype test, two novel design improvements and analyses have been done to eliminate noise and vibration. Additionally, the comparisons with the PEIM on the power factor, efficiency, frame size and active material consumption indicated that a significant performance improvement and active material cost reduction can be achieved by the LSPMSM.

Fabrication and Applications of Hemicellulose-based Hydrogels

Ying Xu,Kun Liu,Yaxin Duan,Yi-Chang He,Chun Gong,Hongxiang Xie,Young-Soo Bae,Chuanling Si 강원대학교 산림과학연구소 2022 강원대학교 산림과학연구소 학술대회 Vol.2022 No.10

Hemicellulose-based hydrogel is a three-dimensional networked hydrophilic polymer with excellent water retention, good biocompatibility and mechanical properties, which has attracted much attention in the field of soft materials, especially in the field of hemicellulose-based materials. Herein, recent advances and developments in hemicellulose-based hydrogels were reviewed. The preparation method, formation mechanism and properties of hemicellulose-based hydrogels are introduced from the aspects of chemical cross-linking and physical cross-linking. The differences of different initiation systems such as light, enzymes, microwave radiation, and glow discharge electrolytic plasma are summarized. The latest applications and developments of hemicellulose-based hydrogels in the fields of controlled drug release, wound dressings, high-efficiency adsorption, and sensors are summarized. Finally, the challenges faced in the field of hemicellulose-based hydrogels are summarized and prospected, in order to provide references for the research of new hemicellulose-based hydrogels.

Isolation and Characterization of a Putative Vacuolar Na+/H+ Antiporter Gene from Zoysia japonica L.

Yanhua Du,Qian Hei,Yaxin Liu,Hui Zhang,Kai Xu,Tao Xia 한국식물학회 2010 Journal of Plant Biology Vol.52 No.4

A Na+/H+ antiporter gene from Zoysia japonica (ZjNHX1) which is a member of plant NHX-genes family was cloned by reverse-transcription-polymerase chain reaction (RT-PCR) and rapid amplification of cDNA ends (RACE)technology. The isolated cDNA is 2,421 bp in length and contains one open-reading frame (ORF) which comprises 540amino acid residues and shows higher homology with other plant Na+/H+ antiporters. ZjNHX1 could partially complement the salt-sensitive phenotypes of Δnhx1 and Δena1-4Δnhx1 yeast mutants in the presence of NaCl, KCl, and LiCl. The expression of ZjNHX1 in Z. japonica increased after NaCl treatment and this result accords with that of Na+contents determination under the same treatment. These results implied that ZjNHX1 functions as a vacuolar Na+/H+antiporter and plays an important role in salt tolerance and ion homeostasis in Z. japonica.

Three sesquiterpene lactones suppress lung adenocarcinoma by blocking TMEM16A-mediated Ca2+-activated Cl− channels

Ruilian Xiu,Jie Jia,Qing Zhang,Fengjiao Liu,Yaxin Jia,Yuanyuan Zhang,Beibei Song,Xiaodan Liu,Jingwei Chen,Dongyang Huang,Fan Zhang,Juanjuan Ma,Honglin Li,Xuan Zhang,Yunyun Geng 대한약리학회 2023 The Korean Journal of Physiology & Pharmacology Vol.27 No.6

Transmembrane protein TMEM16A, which encodes calcium-activated chloride channel has been implicated in tumorigenesis. Overexpression of TMEM16A is associated with poor prognosis and low overall survival in multiple cancers including lung adenocarcinoma, making it a promising biomarker and therapeutic target. In this study, three structure-related sesquiterpene lactones (mecheliolide, costunolide and dehydrocostus lactone) were extracted from the traditional Chinese medicine Aucklandiae Radix and identified as novel TMEM16A inhibitors with comparable inhibitory effects. Their effects on the proliferation and migration of lung adenocarcinoma cells were examined. Whole-cell patch clamp experiments showed that these sesquiterpene lactones potently inhibited recombinant TMEM16A currents in a concentration- dependent manner. The half-maximal concentration (IC50) values for three tested sesquiterpene lactones were 29.9 ± 1.1 μM, 19.7 ± 0.4 μM, and 24.5 ± 2.1 μM, while the maximal effect (Emax) values were 100.0% ± 2.8%, 85.8% ± 0.9%, and 88.3% ± 4.6%, respectively. These sesquiterpene lactones also significantly inhibited the endogenous TMEM16A currents and proliferation, and migration of LA795 lung cancer cells. These results demonstrate that mecheliolide, costunolide and dehydrocostus lactone are novel TMEM16A inhibitors and potential candidates for lung adenocarcinoma therapy.

Effects of Pressure and Deposition Time on the Characteristics of In2Se3 Films Grown by Magnetron Sputtering

Yong Yan,Shasha Li,Yufeng Ou,Yaxin Ji,Zhou Yu,Lian Liu,Chuanpeng Yan,Yong Zhang,Yong Zhao 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.6

Crystalline In2Se3 films were fabricated by magnetron sputtering from a sintered In2Se3-compound target and the effects of the deposition parameters, including the working pressure and deposition time, on the phase composition, structure, morphology, and optical properties were clarified. Single-phase κ-In2Se3 was prepared at 4.0 Pa, but γ-In2Se3 was recognized when the working pressure was lower than 4.0 Pa. The optical transmittance of the films decreased to 45% and the optical band gap varied from 2.9 to 2.0 eV with increasing film thickness from 80 to 967 nm. Metal-semiconductor-metal (MSM) photodetectors based on γ-In2Se3 thin films with various thicknesses were also fabricated. The result of photosensitivity research on such MSM photodetectors suggests that it may be impossible to fabricate wide-absorption-range MSM devices by just using a single material (γ-In2Se3) because of spatial potential fluctuations in the layers.

Facile preparation and characterization of tough poly(vinyl alcohol) organohydrogels with low friction and self-cleaning properties

Jia Yang,Jiajia Hao,Chen Tang,Yaxin Guo,Mingxin Guo,Zhipeng Li,Shuzheng Liu,Hui Yu,Gang Qin,Qiang Chen 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-

Although many hydrogels have been applied to wearable sensors, it is still challenging to simultaneouslyrealize hydrogels with optical transparency, superior mechanical properties, excellent sensing performance,and anti-freezing by using inexpensive raw materials and an easy preparation process. Herein,using ethylene glycol/H2O (EG/ H2O) as a solvent, poly(vinyl alcohol)/EG organohydrogel (PVA/EGOHG) was prepared by a simple heating and frozen-thawing method. Owing to the multifunctionalityof EG (i.e., physical cross-linker, anti-freezer and co-solvent), PVA/EG OHG demonstrated excellent integratedproperties, including high strength, high toughness, and anti-freezing performances. Besides, PVA/EG OHG also showed low friction, self-cleaning, and frost resistance properties. After the introduction ofLiCl, ionically conductive PVA/EG @LiCl organohydrogel was served as a self-cleaning strain sensor, whichcould be long-term stable to detect the motions of human under room and low temperatures. The studyprovides to further understanding of the organohydrogel, which will help us design next-generationhigh-performance organohydrogels.