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Inhomogeneous lithium-storage reaction triggering the inefficiency of all-solid-state batteries

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Journal of Energy Chemistry 2022年第3期31卷 226-236,I0008页

作者： Jaeyoung kim Wontae Lee Jangwhan Seok Eunkang Lee Woosung Choi Hyunyoung Park Soyeong Yun minji kim Jun Lim Won-Sub Yoon Department of Energy Science Sungkyunkwan UniversitySuwon 16419South Korea Pohang Accelerator Laboratory Pohang University of Science and TechnologyPohang 37673South Korea

All-solid-state batteries offer an attractive option for developing safe lithium-ion batteries.Among the various solid-state electrolyte candidates for their applications,sulfide solid electrolytes are the most suitable owing to their high ionic conductivity and facile processability.However,their performance is extensively lower compared with those of conventional liquid electrolyte-based batteries mainly because of interfacial reactions between the solid electrolytes and high capacity cathodes.Moreover,the kinetic evolution reaction in the composite cathode of all-solid-state lithium batteries has not been actively discussed.Here,electrochemical analyses were performed to investigate the differences between the organic liquid electrolyte-based battery and all-solid-state battery systems.Combined with electrochemical analyses and synchrotron-based in situ and ex situ X-ray analyses,it was confirmed that inhomogeneous reactions were due to physical contact.Loosely contacted and/or isolated active material particles account for the inhomogeneously charged regions,which further intensify the inhomogeneous reactions during extended cycles,thereby increasing the polarization of the system.This study highlighted the benefits of electrochemo-mechanical integrity for securing a smooth conduction pathway and the development of a reliable homogeneous reaction system for the success of solid-state batteries.

关键词： Liquid electrolyte lithium batteries All-solid-state lithium batteries Ni-rich cathode Synchrotron-based X-ray techniques Inhomogeneous reaction

Analysis of the effectiveness of cognitive rehabilitation for patients with chronic mental illness:A meta-analysis

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World Journal of Clinical Cases 2023年第32期11卷 7822-7832页

作者： Jong-Sik Jang Seri Oh Geonwoo kim Narae Lee Hyesu Song Jihye Park Yushin Lee minji kim Mihwa Kwon Department of Occupational Therapy Kangwon National UniversitySamcheok 25949South Korea Department of Occupatioanl Therapy Kangwon National University Graduate SchoolSamcheok 25949South Korea Department of Occupational Therapy U1 UniversityChung-Cheong Bukdo 25949South Korea Department of Occupation Therapy Dongnam Health UniversityGyeonggi-do 16328South Korea

BACKGROUND People suffering from chronic mental illness are sensitive to stressful stimuli,lack coping skills,and have low self-esteem due to problems such as social situations.They also experience depression,isolation,fear,and frustration.Due to cognitive dysfunction,people suffering from chronic mental illness have inadequate cognitive processes that lead to distorted thinking.AIM To confirm the effectiveness of cognitive rehabilitation therapy in improving cognitive function and alleviating behavioral and psychological symptoms in patients with chronic mental illness,and to identify the cognitive function that had the main effect.METHODS The quality of the studies was evaluated using the Assessment of Multiple Systematic Reviews criteria,and data published from 2011 to December 2022 were searched using PubMed,Cochrane,RISS,KISS,and DBpia.The keywords used in the search were“mental illness,”“cognitive rehabilitation,”“cognition,”and“mental.”A meta-analysis was conducted on the 12 selected papers.RESULTS The level of evidence for the 12 documents was that of a randomized experimental study.Intervention types in cognitive rehabilitation can be divided into cognitive behavior,cognitive training,cognitive rehabilitation,and computerized cognitive programs.Most of the studies were on schizophrenia,and the measurement areas were cognitive functions(e.g.,concentration,memory,and executive function)as well as depression,sociability,and quality of life.As a result of the meta-analysis of each variable,the effect size for cognitive rehabilitation treatment was in the following order:Sociability,memory,concentration,executive function,quality of life,and depression.Particularly,sociability and memory exhibited significant effects.CONCLUSION Cognitive rehabilitation aids cognitive function and sociability in patients with chronic mental illness and can be used as evidence for cognitive rehabilitation in mental health and occupational therapy.

关键词： Cognitive function Mental illness Cognitive rehabilitation Cognitive training Cognitive therapy Schizophrenia Occupational therapy

Piezoelectric Properties of Three Types of PVDF and ZnO Nanofibrous Composites

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Advanced Fiber Materials 2021年第3期3卷 160-171页

作者： minji kim Jintu Fan Department of Fiber Science and Apparel Design Cornell UniversityIthacaNY 14853USA Institute of Textiles and Clothing Hong Kong Polytechnic UniversityHung HomKowloonHong Kong

Piezoelectric materials are highly desirable for wearable electronics and energy harvesting.Piezoelectric PVDF/ZnO com-posite nanofibers are particularly desirable for their nontoxicity,breathability,and flexibility.Here,we investigated three methods of fabricating PVDF and ZnO composite nanofibers aimed at optimum piezoelectric responses.It was found,(1)adding ZnO nanorod as fillers within the PVDF nanofiber did not improve piezoelectric response due to the fact that the process made the material more dielectric;(2)ZnO nanorods on the PVDF surface increased the power output due to the combined effects of piezoelectricity of ZnO nanorods as well as the triboelectric response of the increased surface roughness;(3)electrospraying pre-synthesized ZnO nanorods on PVDF nanofibers resulted in the highest piezoelectric response due to the combined effect of the greater piezoelectricity of aligned ZnO nanorods and PVDF nanofibers,and larger triboelectric response from increased surface roughness.

关键词： Piezoelectric PVDF ZnO Electrospinning Nanorod Nanofiber Nanocomposite

Nationwide Trends in the Prevalence of Cigarette and E-cigarette Smoking among Korean Adults between 2014-2021:A Representative Serial Study of 1.2 Million Individuals

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Biomedical and Environmental Sciences 2023年第10期36卷 996-998页

作者： minji kim Wonyoung Cho Jinseok Lee Yong Sung Choi Seung Geun Yeo Young Joo Lee Sang Youl Rhee Chanyang Min Dong Keon Yon Center for Digital Health Medical Science Research InstituteKyung Hee University Medical CenterKyung Hee University College of MedicineSeoulSouth Korea Department of Regulatory Science Kyung Hee UniversitySeoulSouth Korea Department of Biomedical Engineering Kyung Hee UniversityYonginSouth Korea Department of Pediatrics Kyung Hee University Medical CenterKyung Hee University College of MedicineSeoulSouth Korea Department of Otolaryngology-Head&Neck Surgery Kyung Hee University Medical CenterKyung Hee University College of MedicineSeoulSouth Korea Department of Obstetrics and Gynecology Kyung Hee University College of MedicineSeoulSouth Korea Department of Endocrinology and Metabolism Kyung Hee University College of MedicineSeoulKorea

Both cigarette and e-cigarette use cause respiratory tract damage and related health outcomes,and potentially increase the risk of coronavirus disease 2019(COVID-19)-related symptoms[1].Since the COVID-19 pandemic,loc... 详细信息

关键词： respiratory damage legal

A Cu-Pd alloy catalyst with partial phase separation for the electrochemical CO_(2) reduction reaction

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Journal of Energy Chemistry 2024年第6期93卷 8-15,I0001页

作者： Gyeong Ho Han Jung Yong Seo minji Kang Myung-gi Seo Youngheon Choi Soo Young kim Sang Hyun Ahn School of Chemical Engineering and Material Science Chung-Ang UniversitySeoul 06974Republic of Korea Lotte Chemical Institute of Technology Daejeon 34110Republic of Korea Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea

Cu catalysts can convert CO_(2) through an electrochemical reduction reaction into a variety of useful carbon-based products.However,this capability provides an obstacle to increasing the selectivity for a single product.Herein,we report a simple fabrication method for a Cu-Pd alloy catalyst for use in a membrane electrode assembly(MEA)-based CO_(2) electrolyzer for the electrochemical CO_(2) reduction reaction(ECRR)with high selectivity for CO production.When the composition of the Cu-Pd alloy catalyst was fabricated at 6:4,the selectivity for CO increased and the production of multi-carbon compounds and hydrogen is suppressed.Introducing a Cu-Pd alloy catalyst with 6:4 ratio as the cathode of the MEAbased CO_(2) electrolyzer showed a CO faradaic efficiency of 92.8%at 2.4 V_(cell).We assumed that these results contributed from the crystal planes on the surface of the Cu-Pd alloy.The phases of the Cu-Pd alloy catalyst were partially separated through annealing to fabricate a catalyst with high selectivity for CO at low voltage and C_(2)H_4 at high voltage.The results of CO-stripping testing confirmed that when Cu partially separates from the lattice of the Cu-Pd alloy,the desorption of~*CO is suppressed,suggesting that C-C coupling reaction is favored.

关键词： Cu-Pd catalyst Electrodeposition Electrochemical carbon dioxide reduction Partial phase separation Membrane electrode assembly-based electrolyzer

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韩国汉阳大学孔子学院汉语教学现状研究

韩国汉阳大学孔子学院汉语教学现状研究

作者：金玟知（kim minji）哈尔滨师范大学

学位级别：硕士

随着2004年全球首家孔子学院在韩国的设立,大批学员通过在孔子学院的学习取得了骄人的成绩,孔子学院日益成为韩国汉语教学的重要平台。作为一名曾经在孔子学院学习过汉语的韩国学生,我认为对韩国孔子学院进行深入、具体、扎实的研究既... 详细信息

随着2004年全球首家孔子学院在韩国的设立,大批学员通过在孔子学院的学习取得了骄人的成绩,孔子学院日益成为韩国汉语教学的重要平台。作为一名曾经在孔子学院学习过汉语的韩国学生,我认为对韩国孔子学院进行深入、具体、扎实的研究既顺应今后学术界的研究发展趋势,也具有一定的理论价值与现实意义。本文在已有研究成果的基础上,以韩国汉阳大学孔子学院为研究个案,运用问卷调查法对其汉语教学现状展开调查,总结其具备的优势与取得的经验,同时发现其在汉语教学方面存在的问题,并结合韩国的实际情况和文化背景,提出具有可行性的改进建议。希望我们的调查研究能为韩国孔子学院的汉语教学提供一些有益的参考。

关键词：汉语教学现状孔子学院韩国汉阳大学

Controlled afterglow luminescent particles for photochemical tissue bonding

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Light(Science & Applications) 2022年第11期11卷 2755-2765页

作者： Seong-Jong kim minji Choi Guosong Hong Sei Kwang Hahn Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)77 Cheongam-roNam-guPohangGyeongbuk 37673Korea Department of Materials Science and Engineering Stanford UniversityStanfordCA 94305USA

Upconversion materials(UCMs)have been developed to convert tissue-penetrating near-infrared(NIR)light into visible light.However,the low energy conversion effciency of UCMs has limited their further biophotonic applications.Here,we developed controlled afterglow luminescent particles(ALPs)of ZnS:Ag,Co with strong and persistent green luminescence for photochemical tissue bonding(PTB).The co-doping of Ag^(+) and Co^(2+) ions into ZnS:Ag,Co particles with the proper vacancy formation of host ions resulted in high luminescence intensity and long-term afterglow.In addition,the ALPs of ZnS:Ag,Co could be recharged rapidly under short ultraviolet(UV)irradiation,which effectively activated rose bengal(RB)in hyaluronate-RB(HA-RB)conjugates for the crosslinking of dissected collagen layers without additional light irradiation.The remarkable PTB of ZnS:Ag,Co particles with HA-RB conjugates was confirmed by in vitro collagen fibrillogenesis assay,in vivo animal wound closure rate analysis,and in vivo tensile strength evaluation of incised skin tissues.Taken together,we could confirm the feasibility of controlled ALPs for various biophotonic applications.

关键词： bonding fir closure

Synchronization of an optical frequency comb and a microwave oscillator with 53 zs/Hz^(1/2) resolution and 10^(-20) -level stability

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Photonics Research 2022年第2期10卷 365-372页

作者： Changmin Ahn Yongjin Na minji Hyun Jinho Bae Jungwon kim School of Mechanical and Aerospace Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea

Precise and stable synchronization between an optical frequency comb(femtosecond mode-locked laser oscillator or microresonator-based comb) and a microwave oscillator is important for various fields including telecommunication, radio astronomy, metrology, and ultrafast X-ray and electron science. Timing detection and synchronization using electro-optic sampling with an interferometer has been actively used for low-noise microwave generation, long-distance timing transfer, comb stabilization, time-of-flight sensing, and laser-microwave synchronization for ultrafast science facilities. Despite its outstanding performance, there has been a discrepancy in synchronization performance of more than 10 dB between the projected shot-noise-limited noise floor and the measured residual noise floor. In this work, we demonstrate the shot-noise-limited performance of an electro-optic timing detector-based comb-microwave synchronization, which enabled an unprecedented residual phase noise floor of -174.5 dBc∕Hz at 8 GHz carrier frequency(i.e., 53 zs∕Hz^(1/2)timing noise floor), integrated rms timing jitter of 88 as(1 Hz to 1 MHz), rms timing drift of 319 as over 12 h, and frequency instability of 3.6 × 10^(-20) over 10,000 s averaging time. We identified that bandpass filtering of the microwave signal and optical pulse repetition-rate multiplication are critical for achieving this performance.

关键词： synchronization interferometer Synchronization

Evaluation of non-point source pollution reduction by applying Best Management Practices using a SWAT model and QuickBird high resolution satellite imagery

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Journal of Environmental Sciences 2010年第6期22卷 826-833页

作者： MiSeon Lee GeunAe Park minji Park JongYoon Park JiWan Lee SeongJoon kim Department of Rural Engineering Konkuk University Department of Civil and Environmental System Engineering Konkuk University

This study evaluated the reduction effect of non-point source pollution by applying best management practices （BMPs） to a 1.21 km^2 small agricultural watershed using a SWAT （Soil and Water Assessment Tool） model. Two meter QuickBird land use data were prepared for the watershed. The SWAT was calibrated and validated using dally streamflow and monthly water quality （total phosphorus （TP）, total nitrogen （TN）, and suspended solids （SS）） records from 1999 to 2000 and from 2001 to 2002. The average Nash and Sutcliffe model efficiency was 0.63 for the streamflow and the coefficients of determination were 0.88, 0.72, and 0.68 for SS, TN, and TP, respectively. Four BMP scenarios viz. the application of vegetation filter strip and riparian buffer system, the regulation of Universal Soil Loss Equation P factor, and the fertilizing control amount for crops were applied and analyzed.

关键词： QuickBird land use Soil and Water Assessment Tool best management practice non-point source