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Highly efficient and stable solid-state fiber dye-sensitized solar cells with Ag-decorated siO_(2) nanoparticles

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Nano Research 2021年第8期14卷 2728-2734页

作者： Jae Ho Kim Seok-Ju Yoo Daseul Lee Jin woo Choi Sang-Cheol Han Tae In Ryu Hyung woo Lee Myunghun Shin Myungkwan Song Materials Center for Energy Convergence Korea Institute of Materials Science(KIMS)797Changwon-daeroSungsan-guChangwonGyeongsangnam-do51508Republic of Korea CEN Nano.Co.Ltd. Nano Convergence CenterMuan-roBuduk-myeonMiryang-siGyeongsangnam-do50404Republic of Korea Accident Coordination and Training Division National Institute of Chemical Safety(NICS)90Gajeongbuk-roYuseong-guDaejeon34114Republic of Korea Department of Nanoenergy Engineering and Research Center of Energy Convergence Technology Pusan National UniversityBusandaehak-ro 63-2Geumjeong-guBusan 46241Republic of Korea School of Electronics and Information Engineering Korea Aerospace University Goyang-cityGyeonggi-do10540Republic of Korea

Fiber-shaped dye-sensitized solar cells(FDSSCs)represent promising futuristic flexible or wearable power sources,owing to their simple fabrication process,light weight,weavability,and *** with strategies on changing the properties of semiconductor materials,the effects of incorporating silver-embedded siO_(2) nanoparticles(Ag@siO_(2)NPs)on the photoanodes of solid-state FDSSCs(SS-FDSSCs)are *** power conversion efficiency(PCE)of SS-FDSSCs with Ag@siO_(2) NPs reaches 5.38%,which is comparable to the reference(3.98%).The PCEs remain at 95%between-16.9 and 91.7℃,indicating the operational stability of SS-FDSSCs within this temperature *** fabricated SS-FDSSCs,whose radii were 2 mm,maintains more than 90%of their efficiency over 500 bending cycles and 10 washing cycles.

关键词： dye-sensitized solar cells fiber-shaped solar cells siO_(2)nanoparticles plasmonic effect solid-state electrolyte

Replica higher-order topology of Hofstadter butterflies in twisted bilayer graphene

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npj Computational Materials 2023年第1期9卷 783-791页

作者： Sun-woo Kim Sunam Jeon Moon Jip Park Youngkuk Kim Department of Physics KAISTDaejeonRepublic of Korea Department of Materials Science and Metallurgy University of CambridgeCambridgeUK Department of Energy Science Sungkyunkwan UniversitySuwonRepublic of Korea Center for Theoretical Physics of Complex Systems Institute for Basic Science(IBS)DaejeonRepublic of Korea Department of Physics Hanyang UniversitySeoulRepublic of Korea Department of Physics Sungkyunkwan UniversitySuwonRepublic of Korea

The Hofstadter energy spectrum of twisted bilayer graphene(TBG)is found to have recursive higher-order topological *** demonstrate that higher-order topological insulator(HOTI)phases,characterized by localized corner states,occur as replicas of the original HOTIs to fulfill the self-similarity of the Hofstadter *** show the existence of exact flux translational symmetry in TBG at all commensurate *** on this result,we identify that the original HOTI phase at zero flux is re-entrant at a half-flux periodicity,where the effective twofold rotation is *** addition,numerous replicas of the original HOTIs are found for fluxes without protecting *** the original HOTIs,replica HOTIs feature both localized corner states and edge-localized real-space topological *** replica HOTIs originate from the different interaction scales,namely,intralayer and interlayer couplings,in *** topological aspect of Hofstadter butterflies revealed in our results highlights symmetry-protected topology in quantum fractals.

关键词： properties spectrum topological

Suggestion of advanced regression model on friction angle of fault gouge in South Korea

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第6期13卷 1368-1379页

作者： Seong-woo Moon Hyun-Seok Yun Yong-Seok Seo Department of Earth and Environmental Sciences Chungbuk National University1 Chungdae-roCheongju-siChungcheongbuk-do28644South Korea

Although friction characteristics of fault gouge are important to understand reactivation of fault,behavior of earthquake,and mechanism of slope failure,analysis results of fault gouge have low accuracy mostly than those of soils or rocks due to its high heterogeneity and low ***,to improve the accuracy of analysis results,we conducted simple regression analysis and structural equation model analysis and selected major influential factors of friction characteristics among many factors,and then we deduced advanced regression model with the highest coefficient of determination(R^(2)) via multiple regression *** most coefficients of determination in simple regression analysis are below0.3-0.4,coefficient of determination in multiple regression analysis is remarkably large as 0.657.

关键词： Fault gouge Friction angle simple regression analysis Structural equation model analysis Multiple regression analysis

Microbial mediated arsenic biotransformation in wetlands

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Frontiers of Environmental Science & Engineering 2017年第1期11卷 5-15页

作者： si-Yu Zhang Paul N. Williams Jinming Luo Yong-Guan Zhu State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China State Key Joint Laboratory of Environment simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China Institute for Global Food Security School of Biological Sciences Queen's University Belfast Belfast BT9 7BN UK Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Key Laboratory of Urban Environment and Health Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China

Arsenic （As） is a pervasive environmental toxin and carcinogenic metalloid. It ranks at the top of the US priority List of Hazardous Substances and causes worldwide human health problems. Wetlands, including natural and artificial ecosystems （i.e. paddy soils） are highly susceptible to As enrichment; acting not only as repositories for water but a host of other elemental/chemical moieties. While macroscale processes （physical and geological） supply As to wetlands, it is the micro-scale biogeochemistry that regulates the fluxes of As and other trace elements from the semi-terrestrial to neighboring plant/ aquatic/atmospheric compartments. Among these fine-scale events, microbial mediated As biotransformations contribute most to the element＇s changing forms, acting as the ＇switch＇ in defining a wetland as either a source or sink of As. Much of our understanding of these important microbial catalyzed reactions follows relatively recent scientific discoveries. Here we document some of these key advances, with focuses on the implications that wetlands and their microbial mediated transformation pathways have on the global As cycle, the chemistries of microbial mediated As oxidation, reduction and methylation, and future research priorities areas.

关键词： Arsenic Wetland Microbes Switch

Missing Value Imputation Model Based on Adversarial Autoencoder Using Spatiotemporal Feature Extraction

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Intelligent Automation & Soft Computing 2023年第8期37卷 1925-1940页

作者： Dong-Hoon Shin Seo-El Lee Byeong-uk Jeon Kyungyong Chung Department of Computer Science Kyonggi UniversitySuwon-siGyeonggi-do16227Korea Department of Public Safety Bigdata Kyonggi UniversitySuwon-siGyeonggi-do16227Korea Division of AI Computer Science and Engineering Kyonggi UniversitySuwon-siGyeonggi-do16227Korea

Recently,the importance of data analysis has increased significantly due to the rapid data *** particular,vehicle communication data,considered a significant challenge in Intelligent Transportation Systems(ITS),has spatiotemporal characteristics and many missing *** missing values in data lead to the decreased predictive performance of *** missing value imputation models ignore the topology of transportation net-works due to the structural connection of road networks,although physical distances are close in spatiotemporal image ***,the learning process of missing value imputation models requires complete data,but there are limitations in securing complete vehicle communication *** study proposes a missing value imputation model based on adversarial autoencoder using spatiotemporal feature extraction to address these *** proposed method replaces missing values by reflecting spatiotemporal characteristics of transportation data using temporal convolution and spatial *** results show that the proposed model has the lowest error rate of 5.92%,demonstrating excellent predictive *** this,it is possible to solve the data sparsity problem and improve traffic safety by showing superior predictive performance.

关键词： Missing value adversarial autoencoder spatiotemporal feature extraction

Fully implantable and battery-free wireless optoelectronic system for modulable cancer therapy and real-time monitoring

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npj Flexible Electronics 2023年第1期7卷 119-130页

作者： Kiho Kim In sik Min Tae Hee Kim Do Hyeon Kim Seungwon Hwang Kyowon Kang Kyubeen Kim Sangun Park Jongmin Lee Young uk Cho Jung woo Lee woon-Hong Yeo Young Min Song Youngmee Jung Ki Jun Yu Functional Bio-integrated Electronics and Energy Management Lab School of Electrical and Electronic EngineeringYonsei University50 Yonsei-roSeodaemun-guSeoul 03722Republic of Korea Center for Biomaterials Biomedical Research InstituteKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Fusion Research and Collaboration Biomedical Research InstituteSeoul National University HospitalSeoul 03080Republic of Korea School of Electrical Engineering and Computer Science(EECS) Gwangju Institute of Science and Technology(GIST)Gwangju 61005Republic of Korea PA1 Foundry BusinessSamsung Electronics1 Samsungjeonja-roHwaseong-siGyeonggi-doRepublic of Korea R&D Center DNA Lab PharmaresearchSeongnam 13486Republic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul 136-705Republic of Korea School of Materials Science and Engineering Energy Materials for Soft Electronics LaboratoryPusan National UniversityBusan 46241Republic of Korea IEN Center for Human-Centric Interfaces and Engineering and George W.woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGA 30332USA Wallace H.Coulter Department of Biomedical Engineering Georgia Institute of Technology and Emory University School of MedicineAtlantaGA 30332USA Institute for Robotics and Intelligent Machines Parker H.Petit Institute for Bioengineering and BiosciencesInstitute for MaterialsNeural Engineering CenterGeorgia Institute of TechnologyAtlantaGA 30332USA School of Electrical and Electronic Engineering YU-Korea Institute of Science and Technology(KIST)InstituteYonsei University50Yonsei-roSeodaemun-guSeoul 03722Republic of Korea

Photodynamic therapy(PDT)is attracting attention as a next-generation cancer treatment that can selectively destroy malignant tissues,exhibit fewer side effects,and lack pain during *** PDT systems have recently been developed to resolve the issues of bulky and expensive conventional PDT systems and to implement continuous and repetitive *** implantable PDT systems,however,are not able to perform multiple functions simultaneously,such as modulating light intensity,measuring,and transmitting tumor-related data,resulting in the complexity of cancer ***,we introduce a flexible and fully implantable wireless optoelectronic system capable of continuous and effective cancer treatment by fusing PDT and hyperthermia and enabling tumor size monitoring in *** system exploits micro inorganic light-emitting diodes(μ-LED)that emit light with a wavelength of 624 nm,designed not to affect surrounding normal tissues by utilizing a fully programmable light intensity ofμ-LED and precisely monitoring the tumor size by si phototransistor during a long-term implantation(2–3 weeks).The superiority of simultaneous cancer treatment and tumor size monitoring capabilities of our system operated by wireless power and data transmissions with a cell phone was confirmed through in vitro experiments,ray-tracing simulation results,and a tumor xenograft mouse model in *** all-in-one single system for cancer treatment offers opportunities to not only enable effective treatment of tumors located deep in the tissue but also enable precise and continuous monitoring of tumor size in real-time.

关键词： optoelectronic enable battery

Etching characteristics of thin siON films using a liquefied perfluorocarbon precursor of C_6F_(12)O with a low global warming potential

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Plasma Science and Technology 2020年第10期22卷 135-144页

作者： Junmyung LEE Yunho NAM Jongchan LEE Hyun woo LEE Kwang-Ho KWON Department of Control and Instrumentation Engineering Korea UniversitySejong 30019Republic of Korea Department of Aeronautic Computer Engineering Hanseo UniversitySeosan 31962Republic of Korea

Perfluorocarbon gas is widely used in the semiconductor ***,perfluorocarbon has a negative effect on the global environment owing to its high global warming potential(GWP) *** alternative solution is ***,we evaluated the possibility of replacing conventional perfluorocarbon etching gases such as CHF_3 with C_6F_(12)O,which has a low GWP and is in a liquid state at room *** this study,silicon oxynitride(siON) films were plasma-etched using inductively coupled CF4+C_6F_(12)O+O_2 mixed ***,the etching characteristics of the film,such as etching rate,etching profile,selectivity over si,and photoresist,were investigated.A double Langmuir probe was used and optical emission spectroscopy was performed for plasma *** addition,a contact angle goniometer and x-ray photoelectron spectroscope were used to confirm the change in the surface properties of the etched siON film ***,the etching characteristics of the C_6F_(12)O mixed plasma exhibited a lower etching rate,higher siON/si selectivity,lower plasma damage,and more vertical etched profiles than the conventional CHF_3 mixed *** addition,the C_6F_(12)O gas can be recovered in the liquid state,thereby decreasing global *** results confirmed that the C_6F_(12)O precursor can sufficiently replace the conventional etching gas.

关键词： global warming potential perfluorocarbon silicon oxynitride etching characteristics liquid-state perfluorocarbon

Artificial synaptic and self-rectifying properties of crystalline(Na_(1-x)K_(x))NbO_(3)thin films grown on Sr_(2)Nb_(3)O_(10)nanosheet seed layers

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Journal of Materials Science & Technology 2022年第28期123卷 136-143页

作者： In-Su Kim Jong-Un woo Hyun-Gyu Hwang Bumjoo Kim Sahn Nahm Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul 02841Republic of Korea

Crystalline(Na_(1-x)K_(x))NbO_(3)(NKN)thin films were deposited on Sr_(2)Nb_(3)O_(10)/TiN/si(S-TS)substrates at 370°***_(2)Nb_(3)O_(10)(SNO)nanosheets served as a template for the formation of crystalline NKN films at low *** the NKN film was deposited on one SNO monolayer,the NKN memristor exhibited normal bipolar switching characteristics,which could be attributed to the formation and destruction of oxygen vacancy ***,the NKN memristor with one SNO monolayer exhibited artificial synaptic ***,the NKN memristor deposited on two SNO monolayers exhibited self-rectifying bipolar switching properties,with the two SNO monolayers acting as tunneling barriers in the *** conduction mechanism of the NKN memristor with two SNO monolayers in the highresistance state is attributed to Schottky emission,direct tunneling,and Fowler–Nordheim(FN)*** current conduction in this memristor in the low-resistance state was governed by direct tunneling and FN ***,the NKN memristor with two SNO monolayers exhibited large ON/OFF and rectification ratios and artificial synaptic ***,an NKN memristor with two SNO monolayers can be used for fabricating artificial synaptic devices with a cross-point array structure.

关键词： Bipolar switching properties Self-rectifying bipolar switching properties Artificial synaptic properties Crystalline NKN thin film Sr_(2)Nb_(3)O_(10)nanosheet seed layer

The influence of urbanization on karst rivers based on nutrient concentration and nitrate dual isotopes： an example from southwestern China

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Acta Geochimica 2017年第3期36卷 446-451页

作者： Zhong-Jun Wang Fu-Jun Yue Jie Zeng si-Liang Li State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of SciencesGuiyang 550081 China University of Chinese Academy of Sciences Beijing 100049China Puding Karst Ecosystem Research Station Institute of Geochemistry Chinese Academy of Sciences Anshun 562100 China School of Geographical and Earth Sciences University of Glasgow Glasgow G12 8QQ UK Key Laboratory of Karst Environment and Geohazard Ministry of Land and Resources Guizhou UniversityGuiyang 550025 China Institute of Surface-Earth System Science Tianjin University Tianjin 300072 China State Key Laboratory of Hydraulic Engineering simulation and Safety Tianjin University Tianjin 300072 China

China is experiencing rapid urbanization that has changed the water quality of rivers, especially nutrient loads. In this study, a typical urban river located in a karst area, Chengguan River, was chosen to explore the influence of urbanization on river ecosystems based on nutrient concentration and nitrate isotopes. The results show monthly variability of water chemistry and nutrient concentration. Nutrient concentration in two tributaries and the mainstem showed significant spatial variability, with heavy N and P pollution in one tributary near a suburban area,indicating a response to different levels of *** of nitrate dual isotopes suggest thatvolatilization, assimilation, nitrification, and denitrification all occur in the polluted river. Water chemistry and nitrate isotopes show that major nitrogen sources included domestic waste and agricultural input, such as chemical fertilizer and manure. The results suggest that urbanization increases nutrient concentrations and accelerates the riverine nitrogen dynamic, and point to the need to manage point sources of sewage effluents to improve the water quality of urban rivers in southwestern China.

关键词： Urbanization Urban river Nitrate isotopes Southwestern China Chengguan River