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Oxygen vacancy engineering for tuning the catalytic activity of LaCoO_(3) perovskite

Journal of Rare Earths 2024年第3期42卷 506-514,I0003页

作者： Jeong Hyun Cho Minjae Kim Inchan Yang Kyung Tae park Chang Houn Rhee Hai woong park ji Chul Jung Department of Chemical Engineering Myongji UniversityYongin 17058Republic of Korea Institute of Advanced Composite Materials Korea Institute of Science and TechnologyWanju-gunJeollabuk-do 55324Republic of Korea Iron&Steel Process Engineering Research Group POSCOPohang 37859Republic of Korea Hydrogen Research Center Research Institute of Industrial Science&Technology(RIST)Pohang 37673Republic of Korea

Herein, we attempted to engineer oxygen vacancies on the surface of LaCoO_(3) perovskite through simple post-treatments(acid or reductive thermal treatments). Acid treatment induces oxygen vacancies through the selective etching of the La cations, whereas thermal treatment in a reducing atmosphere generates oxygen vacancies by directly removing lattice oxygen. The characterization results confirm that the number of surface oxygen vacancies, which are crucial in various catalytic oxidation reactions,considerably increases in the LaCoO_(3) catalysts treated with acid or reducing gas. Acid treatment enriches the oxygen vacancies while maintaining the structure of the LaCoO_(3) catalysts, which can not be achieved through reductive thermal treatment. Therefore, the acid treatment is considered a promising technique for oxygen vacancy engineering of perovskite catalysts for tuning their catalytic activities. Furthermore,the catalytic activities of the posttreated LaCoO_(3) catalysts for CO oxidation were evaluated and are noted to be considerably better than those of the pristine LaCoO_(3) catalyst due to their abundant oxygen vacancies. Consequently, we conclude that the oxygen vacancies of perovskite catalysts can be effectively engineered via two simple methods and play a significant role in CO oxidation.

关键词： LaCoO_(3)perovskite Acid treatment Reductive thermal treatment Oxygen vacancy CO oxidation Rare earths

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中国淘宝和韩国G-MARKET的对比研究

中国淘宝和韩国G-MARKET的对比研究

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作者： park ji woong 中国石油大学(华东)

学位级别：硕士

淘宝和G-MARKET已经是中韩两国具有代表的网络市场。韩国和中国具有相似的文化圈,但考虑到环境差异的特点,淘宝和G-MARKET是在各国内规模最大的电子商务网站,有着正在快速成长的趋势,成为国际的关注。淘宝是以中国东方文化和中国消费者... 详细信息

淘宝和G-MARKET已经是中韩两国具有代表的网络市场。韩国和中国具有相似的文化圈,但考虑到环境差异的特点,淘宝和G-MARKET是在各国内规模最大的电子商务网站,有着正在快速成长的趋势,成为国际的关注。淘宝是以中国东方文化和中国消费者偏好为中心建立的网络交易平台,在中国诸多C2C交易平台中脱颖而出并发展壮大,具有很强的影响力和大比例市场份额,坐上了中国电商网站的第一位,是值得深思和研究分析的;G-MARKET作为韩国最大电商网站,不管是在比较购物网站中从各个维度的比较筛选中能搜到其产品链接,还是在各大商场和路牌广告能看到其明星代言广告,它的消费者召集能力和宣传广度都值得研究和学习。本研究的电子商务的手段迅速崛起的OPEN MARKET为主题,写出东洋儒教汉字文化圈的中国和韩国的互联网OPEN MARKET的领头企业G-MARKET和淘宝的特性和不同点,最后写出OPEN MARKET成功的要素。淘宝作为中国C2C电子商务的主流模式已逐渐被广大中国消费者接受和认可,G-MARKET也是作为被广大韩国消费者认可,并在韩国电子商务中占据相当大份额的主流模式。两者在自己的国土领域都有着不能被取代的地位,但是随着人们生活节奏的不断加快、网络技术的不断发展以及竞争的日益激烈,淘宝模式应不断创新以适应新的变化。随着越来越多的传统企业被吸引进入B2C网络零售领域,竞争会更加的激励,如何在竞争者中脱颖而出,如何实现盈利,并维持自身的生存和发展,一方面取决于企业的综合实力,另一方面商业模式也是一个重要的因素。通过对比两个国家实力派的电子商务企业,可以扬长避短,帮助彼此在广阔的市场中反省和发展自己,有利于弥补不足,提升自身的竞争力。为了研究两者之间的差异性文化带来的现状差异特点,本文首先交代了电子商务的发展和中韩的对比来作为研究背景,然后陈述了相关理论基础,包括网上商城的发展现状和网上/传统零售业及O2O销售模式的介绍;分析了两者的发展现状,从战略环境、战略选择和竞争策略方面分析了战略的差异,并在此运用了SWOT分析法和4P分析法;然后对二者的企业运作和成功要素差异进行了比较,最后得到对韩国网上商城发展的启示,即O2O销售战略的运用,连接线上线下是最终电子商务应该有的发展方向。文章的创新点在对两者从发展现状简单对比到战略层面的深入分析,搜集中韩两个国家的相关文献,并进行翻译,运用文献总结和4P、SWOT分析等分析工具对二者进行了详尽对比,并根据二者的成功要素对韩国电子商务的发展趋势进行了简单陈述,解决了目前尚无学者对二者进行比较分析的研究空白,提出电商发展趋势,为今后的研究做了一个良好的铺垫和文献整理。

关键词：淘宝 G-MARKET O2O 电子商务对比分析

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MV-Honeypot:Security Threat Analysis by Deploying Avatar as a Honeypot in COTS Metaverse Platforms

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Computer Modeling in Engineering & Sciences 2024年第10期141卷 655-669页

作者： Arpita Dinesh Sarang Mohsen Ali Alawami Ki-woong park SysCore Lab.(Convergence Engineering for Intelligent Drone) Sejong UniversitySeoul05006Republic of Korea Division of Computer Engineering Hankuk University of Foreign StudiesYongin-si17035Republic of Korea Department of Information Security Sejong UniversitySeoul05006Republic of Korea

Nowadays,theuse of Avatars that are unique digital depictions has increased by users to access Metaverse—a virtual reality environment—through multiple devices and for various ***,the Avatar and Metaverse are being developed with a new theory,application,and design,necessitating the association of more personal data and devices of targeted users every *** Avatar and Metaverse technology explosion raises privacy and security concerns,leading to cyber ***-Honeypot,or Metaverse-Honeypot,as a commercial off-the-shelf solution that can counter these cyber attack-causing vulnerabilities,should be *** fill this gap,we study user’s engagements with Avatars in Metaverse,analyze possible security vulnerabilities,and create a model named Simplified Avatar Relationship Association with Non-linear Gradient(SARANG)that draws the full diagram of infrastructure components and data flow through accessing Metaverse in this *** also determine the most significant threat for each component’s cyberattacks that will affect user data and *** a result,the commercial off-the-shelf(COTS)of the MV-Honeypot must be established.

关键词： Avatar metaverse cybersecurity cloud computing internet of things artificial intelligence security analysis

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A survey on the real-world clinical utilization of a traditional acupuncture in Republic of Korea:Sa-am acupuncture

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Journal of Integrative Medicine 2024年第5期22卷 570-578页

作者： ji-Yeun park Ye-Seul Lee Hi-Joon park Seungmin Kathy Lee ji-Won Lee Song-Yi Kim College of Korean Medicine Daejeon UniversityDaejeon 34520Republic of Korea Jaseng Spine and Joint Research Institute Jaseng Medical FoundationSeoul 06110Republic of Korea Acupuncture and Meridian Science Research Center Kyung Hee UniversitySeoul 02447Republic of Korea Department of Korean Medicine Korean Medical CenterLusail 201184Qatar Virginia University of Integrative Medicine ViennaVA 22182USA Department of Anatomy and Acupoint College of Korean MedicineGachon UniversitySeongnamGyeonggi 13120Republic of Korea Department of Ophthalmology Otolaryngologyand DermatologyCollege of Korean MedicineDongguk UniversityGoyangGyeonggi 10326Republic of Korea

Objective This study investigated the clinical details and usage of Sa-am acupuncture in Korean medicine clinics and explored how practicing Korean medicine doctors(KMDs)think about Sa-am *** We conducted a questionnaire-based survey of KMDs who utilize Sa-am acupuncture in their *** study comprehensively investigated issues related to clinical application of Sa-am acupuncture,needling techniques used during treatment,training methods,and directions for its future *** We analyzed 572 *** average of 50%of the patients visiting Korean medicine clinics were receiving Sa-am *** most prevalent indication for Sa-am acupuncture use was digestive *** patients’appetite level and digestive function were most frequently used indicators for selecting acupuncture *** prescription compositions,Jung-Gyuk formulas were more frequently used than Seung-Gyuk *** the needle along the flow of the channel or against the flow of the channel was most *** acupuncture style most frequently used in combination with Sa-am acupuncture was Ashi point *** of Sa-am acupuncture included its versatility,easy application,and good *** included the lack of rigorous education and training programs,difficulty in applying the principles for beginners,and insufficient clinical research *** In clinics where Sa-am acupuncture is available,KMDs were providing Sa-am acupuncture to about half of their *** were not using all of the tonification and sedation techniques which may be due to time constraints or simply a lack of ***-am acupuncture demonstrated high utility in clinical practice and high satisfaction based on the efficacy and *** training programs and high-quality research are needed to help expand the use of Sa-am acupuncture.

关键词： Sa-am acupuncture Traditional East Asian medicine Acupuncture education Acupoint selection

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Towards high-performance and robust anion exchange membranes(AEMs)for water electrolysis:Super-acid-catalyzed synthesis of AEMs

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Journal of Energy Chemistry 2024年第6期93卷 478-510,I0012页

作者： Geun woong Ryoo Sun Hwa park Ki Chang Kwon Jong Hun Kang Ho Won Jang Min Sang Kwon Department of Materials Science and Engineering Research Institute of Advanced Materials(RIAM)Seoul National UniversitySeoul 08826Republic of Korea Interdisciplinary Materials Measurement Institute Korea Research Institute of Standards and Science(KRISS)Daejeon 34113Republic of Korea Department of Chemical and Biological Engineering and Institute of Chemical ProcessSeoul National UniversitySeoul 08826Republic of Korea Department of Applied Measurement Science University of Science and TechnologyDaejeon 34113Republic of Korea

The increasing demand for hydrogen energy to address environmental issues and achieve carbon neutrality has elevated interest in green hydrogen production,which does not rely on fossil *** various hydrogen production technologies,anion exchange membrane water electrolyzer(AEMWE)has emerged as a next-generation technology known for its high hydrogen production efficiency and its ability to use non-metal ***,this technology faces significant challenges,particularly in terms of the membrane durability and low ionic *** address these challenges,research efforts have focused on developing membranes with a new backbone structure and anion exchange groups to enhance durability and ionic ***,the super-acid-catalyzed condensation(SACC)synthesis method stands out due to its user convenience,the ability to create high molecular weight(MW)polymers,and the use of oxygen-tolerant organic *** the synthesis of anion exchange membranes(AEMs)using the SACC method began in 2015,and despite growing interest in this synthesis approach,there remains a scarcity of review papers focusing on AEMs synthesized using the SACC *** review covers the basics of SACC synthesis,presents various polymers synthesized using this method,and summarizes the development of these polymers,particularly their building blocks including aryl,ketone,and anion exchange *** systematically describe the effects of changes in the molecular structure of each polymer component,conducted by various research groups,on the mechanical properties,conductivity,and operational stability of the *** review will provide insights into the development of AEMs with superior performance and operational stability suitable for water electrolysis applications.

关键词： Green hydrogen production Water electrolysis Anion exchange membrane water electrolyzer(AEMWE) Anion exchange membranes(AEMs) Super-acid-catalyzed condensation(SACC)

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