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Wearable sensors and supercapacitors using electroplated-Ni/ZnO antibacterial fabric

Journal of Materials Science & Technology 2022年第5期100卷 254-264页

作者： Taegun Kim Chanwoo Park Edmund P.Samuel Yong-Il Kim Seongpil An Sam S.Yoon School of Mechanical Engineering Korea UniversitySeoul 02841Republic of Korea KU-KIST Green School Korea UniversitySeoul 136-713Republic of Korea SKKU Advanced Institute of Nanotechnology(SAINT)and Department of Nano Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea

Herein,nickel nanocones and zinc oxide nanosheets were electroplated onto a fabric to produce multifunctional(wearable,stretchable,washable,hydrophobic,and antibacterial)materials with sensing,heating,and supercapacitive *** these functionalities are integrated into a one-layered fabric that can be used as a portable intelligent electronic textile for potential application in healthcare monitoring,smart sportswear,and energy *** nickel enhances the electrical conductivity and thus increases the electron charge transfer for supercapacitor *** integration of ZnO with the Ni-plated fabric provides pseudocapacitance via redox reactions with the *** resistance of the Ni/ZnO fabric changes in response to external stimuli such as temperature and *** voltage is applied,the fabric generates heat through Joule heating,demonstrating its potential application as winter *** superior mechanical durability of the fabric was confirmed through bending and stretching *** hydrophobic surface prevents viruses contained in liquid droplets from infiltrating the *** addition,bacterial growth is inhibited because of the antibacterial properties of the Ni/ZnO fabric and because of Joule *** one-layered fabric integrated with such multiple functionalities is expected to be applicable in the development of next-generation portable and wearable electronic textiles in various industries.

关键词： Multifunctional conductive fabric Fabric supercapacitor Fabric heater Thermal and strain sensors Electroplating

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Graph Construction Method for GNN-Based Multivariate Time-Series Forecasting

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Computers, Materials & Continua 2023年第6期75卷 5817-5836页

作者： Wonyong Chung Jaeuk Moon Dongjun Kim Eenjun Hwang School of Electrical Engineering Korea UniversitySeoul02841Korea

Multivariate time-series forecasting(MTSF)plays an important role in diverse real-world *** achieve better accuracy in MTSF,time-series patterns in each variable and interrelationship patterns between variables should be considered ***,graph neural networks(GNNs)has gained much attention as they can learn both patterns using a *** accurate forecasting through GNN,a well-defined graph is ***,existing GNNs have limitations in reflecting the spectral similarity and time delay between nodes,and consider all nodes with the same weight when constructing *** this paper,we propose a novel graph construction method that solves aforementioned *** first calculate the Fourier transform-based spectral similarity and then update this similarity to reflect the time ***,we weight each node according to the number of edge connections to get the final graph and utilize it to train the GNN *** experiments on various datasets,we demonstrated that the proposed method enhanced the performance of GNN-based MTSF models,and the proposed forecasting model achieve of up to 18.1%predictive performance improvement over the state-of-the-art model.

关键词： Deep learning graph neural network multivariate time-series forecasting

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Machine Learning-Based Two-Stage Data Selection Scheme for Long-Term Influenza Forecasting

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Computers, Materials & Continua 2021年第9期68卷 2945-2959页

作者： Jaeuk Moon Seungwon Jung Sungwoo Park Eenjun Hwang School of Electrical Engineering Korea UniversitySeoul02841Korea

One popular strategy to reduce the enormous number of illnesses and deaths from a seasonal influenza pandemic is to obtain the influenza vaccine on ***,vaccine production preparation must be done at least six months in advance,and accurate long-term influenza forecasting is essential for *** diverse machine learning models have been proposed for influenza forecasting,they focus on short-term forecasting,and their performance is too dependent on input *** a country’s longterm influenza forecasting,typical surveillance data are known to be more effective than diverse external data on the *** propose a two-stage data selection scheme for worldwide surveillance data to construct a longterm forecasting model for influenza in the target *** the first stage,using a simple forecasting model based on the country’s surveillance data,we measured the change in performance by adding surveillance data from other countries,shifted by up to 52 *** the second stage,for each set of surveillance data sorted by accuracy,we incrementally added data as input if the data have a positive effect on the performance of the forecasting model in the first *** the selected surveillance data,we trained a new longterm forecasting model for influenza and perform influenza forecasting for the target *** conducted extensive experiments using six machine learning models for the three target countries to verify the effectiveness of the proposed *** report some of the results.

关键词： Influenza data selection machine learning forecasting

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Single-molecule surface-enhanced Raman scattering： Current status and future perspective

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Frontiers of physics 2014年第1期9卷 25-30页

作者： Zee Hwan Kim Department of Chemistry Korea University Seoul 136-701 Korea

The single-molecule surface-enhanced Raman scattering （smSERS） has been extensively studied after the initial observation in 1997, yet there still exist unsettled issues in the fundamental mechanism of smSERS. In th... 详细信息

关键词： plasmonics nanoparticles molecular vibration Raman scattering

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On the Evolutionary Dynamics of the Cahn-Hilliard Equation with Cut-Off Mass Source

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Numerical Mathematics(Theory,Methods and Applications) 2021年第1期14卷 242-260页

作者： Chaeyoung Lee Hyundong Kim Sungha Yoon Jintae Park Sangkwon Kim Junxiang Yang Junseok Kim Department of Mathematics Korea UniversitySeoul 02841Republic of Korea

We investigate the effect of cut-off logistic source on evolutionary dynamics of a generalized Cahn-Hilliard(CH)equation in this *** is a well-known fact that the maximum principle does not hold for the CH ***,a generalized CH equation with logistic source may cause the negative concentration blow-up problem in finite *** overcome this drawback,we propose the cut-off logistic source such that only the positive value greater than a given critical concentration can *** consider the temporal profiles of numerical results in the one-,two-,and three-dimensional spaces to examine the effect of extra mass *** solutions are obtained using a finite difference multigrid ***,we perform numerical tests for tumor growth simulation,which is a typical application of generalized CH equations in *** apply the proposed cut-off logistic source term and have good results.

关键词： Cahn-Hilliard equation logistic source finite difference method tumor growth application

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UFC-Net with Fully-Connected Layers and Hadamard Identity Skip Connection for Image Inpainting

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Computers, Materials & Continua 2021年第9期68卷 3447-3463页

作者： Chung-Il Kim Jehyeok Rew Yongjang Cho Eenjun Hwang korea Electronics Technology Institute Seongnam13488Korea School of Electrical Engineering Korea UniversitySeoul02841Korea

Image inpainting is an interesting technique in computer vision and artificial intelligence for plausibly filling in blank areas of an image by referring to their surrounding *** its performance has been improved significantly using diverse convolutional neural network(CNN)-based models,these models have difficulty filling in some erased areas due to the kernel size of the *** the kernel size is too narrow for the blank area,the models cannot consider the entire surrounding area,only partial areas or none at *** issue leads to typical problems of inpainting,such as pixel reconstruction failure and unintended *** alleviate this,in this paper,we propose a novel inpainting model called UFC-net that reinforces two components in *** first component is the latent networks in the middle of U-net to consider the entire surrounding *** second component is the Hadamard identity skip connection to improve the attention of the inpainting model on the blank areas and reduce computational *** performed extensive comparisons with other inpainting models using the Places2 dataset to evaluate the effectiveness of the proposed *** report some of the results.

关键词： Image processing computer vision image inpainting image restoration generative adversarial nets

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A novel extended Portuguese of Interactive and Multi-Criteria Decision Making and Archimedean Bonferroni mean operators based on prospect theory to select green supplier with complex q-rung orthopair fuzzy information

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CAAI Transactions on Intelligence Technology 2023年第1期8卷 177-191页

作者： Zeeshan Ali Tahir Mahmood Jeonghwan Gwak Naeem Jan Department of Mathematics&Statistics International Islamic University IslamabadIslamabadPakistan Department of Software Korea National University of TransportationChungjuKorea Department of Biomedical Engineering Korea National University of TransportationChungjuKorea Department of AI Robotics Engineering Korea National University of TransportationChungjuKorea Department of IT&Energy Convergence(BK21 FOUR) Korea National University of TransportationChungjuKorea

The word sustainable or green supply chain refers to the concept of incorporating sustainable environmental procedures into the traditional supply *** supply chain management gives a chance to revise procedures,materials and operational *** the fuzziness of assessing data and the spiritual situations of experts in the decision-making procedure are two important *** main contribution of this analysis is to derive the theory of Archimedean Bonferroni mean operator for complex qrung orthopair fuzzy(CQROF)information,called the CQROF Archimedean Bonferroni mean and CQROF weighted Archimedean Bonferroni mean operators which are very valuable,dominant and classical type of aggregation operators used for examining the interrelationship among the finite number of attributes in modern data fusion *** and well-used properties of the initiated theories are also diagnosed with some special ***,the theory of extended TODIM tool using the prospect theory based on CQROF information was discovered,which play an essential and critical role in the environment of fuzzy set ***,a real life problem by computing a green supply chain management based on the initiated CQROF operators was evaluated and fully illustrating the feasibility and efficiency of the diagnosed work with the help of a comparison between existing and prevailing theories.

关键词： fuzzy set fuzzy sets

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Dopant-Tunable Ultrathin Transparent Conductive Oxides for Efficient Energy Conversion Devices

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Nano-Micro Letters 2021年第12期13卷 437-451页

作者： Dae Yun Kang Bo-Hyun Kim Tae Ho Lee Jae Won Shim Sungmin Kim Ha-Jun Sung Kee Joo Chang Tae Geun Kim School of Electrical Engineering Korea UniversitySeoul 02841Republic of Korea Department of Advanced Materials Engineering Kongju National UniversityCheonan 31080Republic of Korea Department of Physics Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea

Ultrathin film-based transparent conductive oxides(TCOs)with a broad work function(WF)tunability are highly demanded for e cient energy conversion ***,reducing the film thickness below 50 nm is limited due to rapidly increasing resistance;furthermore,introducing dopants into TCOs such as indium tin oxide(ITO)to reduce the resistance decreases the transparency due to a trade-o between the two ***,we demonstrate dopant-tunable ultrathin(≤50 nm)TCOs fabricated via electric field-driven metal implantation(m-TCOs;m=Ni,Ag,and Cu)without com-promising their innate electrical and optical *** m-TCOs exhibit a broad WF variation(0.97 eV),high transmittance in the UV to visible range(89–93%at 365 nm),and low sheet resistance(30–60Ωcm-2).Experimental and theoretical analyses show that interstitial metal atoms mainly a ect the change in the WF without substantial losses in optical *** m-ITOs are employed as anode or cathode electrodes for organic light-emitting diodes(LEDs),inorganic UV LEDs,and organic photovoltaics for their universal use,leading to outstanding performances,even without hole injection layer for OLED through the WF-tailored *** results verify the proposed m-TCOs enable e ective carrier transport and light extraction beyond the limits of traditional TCOs.

关键词： Transparent conductive oxide Metal implantation High transparency Low sheet resistance Work function

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Incremental age-related one-year MACCE after acute myocardial infarction in the drug-eluting stent era （from KAMIR-NIH registry）

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Journal of Geriatric Cardiology 2018年第9期15卷 574-584页

作者： Dae-Won Kim Sung-Ho Her Ha Wook Park Kiyuk Chang Wook Sung Chung Ki Bae Seung Myung Ho Jeong Hyo-Soo Kim Hyeon Cheoi Gwon In Whan Seong Kyung Kuk Hwang Shung Chull Chae Kwon-Bae Kim Young Jo Kim Kwang Soo Cha Seok Kyu Oh Jei Keon Chae Ji-Hoon Jung Division of Cardiology Daejeon St. Mary's Hospital College of Medicine the Catholic University of Korea Seoul South Korea Division of Cardiology Seoul St. Mary's Hospital College of Medicine the Catholic University of Korea Seoul South Korea Chonnam National university Hospital Gwangju South Korea Seoul National university Hospital Seoul South Korea Sungkyunkwan Universtiy Samsung Medical Center Seoul South Korea Chungnam National university Hospital Daejeon South Korea Chungbuk National university Hospital Cheongju South Korea Kyungpook National university Hospital Daegu South Korea Keimyung university Dongsan Medical Center Daegu South Korea Yeungnam university Hospital Daegu South Korea Pusan National university Hospital Busan South Korea Wonkwang university Hospital Iksan South Korea Chonbuk National university Hospital Jeonju South Korea Statistical Manager Institute of Toxicology Daejeon South Korea

Objectives To evaluate the age-related one-year major adverse cardiocerebrovascular events （MACCE） after percutaneous coronary intervention （PCI） in acute myocardial infarction （AMI）. We analyzed the association between age and one-year MACCE after AMI. Methods A total of 13,104 AMI patients from korea Acute Myocardial Infarction Registry-National Institue of Health （KAMIR-NIH） between November 2011 and December 2015 were classified into four groups according to age （Group I, 〈 60 years, n = 4199; Group II, 60-70 years, n = 2577; Group III; 70-80 years, n = 2774; Group IV, ≥ 80 years, n = 1018）. Patients were analyzed for one-year composite of MACCE （cardiac death, myocardial infarction, target vessel revascularization, cerebrovascular events） after AMI. Results The one-year MACCE in AMI were 3.5% （Group I）, 6.3% （Group II）, 9.6% （Group III） and 17.6% （Group IV）. After adjustment for confounding para- meters, the analysis results showed that patients with AMI had incremental risk of one-year MACCE [Group II, adjusted hazard ratios （aHR） = 1.224, 95% CI： 0.965-1.525, P = 0.096; Group III, aHR = 1.316, 95% CI： 1.037-1.671, P= 0.024; Group IV, aHR = 1.975, 95% CI： 1.500-62.601, P〈 0.001） compared to Group I. Especially, cardiac death in the composite of primary end point played a major role in this effect （Group II, aHR = 1.335, 95% CI： 0.941-1.895, P= 0.106; Group III, aHR = 1.575, 95% CI： 1.122-2.210, P= 0.009; Group IV, aHR = 2.803, 95% CI： 1.937-4.054, P 〈 0.001）. Conclusions Despite advanced techniques and medications for PCI in AMI, age still exerts a powerful influence in clinical outcomes. Careful approaches, even in the modem era of developed cardiology are needed for aged-population in AMI intervention.

关键词： Acute myocardial infarction Aged-population Major adverse cardiocerebrovascular events

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Structural and electrochemical stabilization enabling high-energy P3-type Cr-based layered oxide cathode for K-ion batteries

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Carbon Energy 2024年第5期6卷 81-93页

作者： Wonseok Ko Seokjin Lee Hyunyoung Park Jungmin Kang Jinho Ahn Yongseok Lee Gwangeon Oh Jung-Keun Yoo Jang-Yeon Hwang Jongsoon Kim Department of Energy Science Sungkyunkwan UniversitySuwonRepublic of Korea SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan UniversitySuwonRepublic of Korea Department of Energy Engineering Hanyang UniversitySeoulRepublic of Korea Carbon Composites Department Korea Institute of Materials Science(KIMS)ChangwonRepublic of Korea Department of Battery Engineering Hanyang UniversitySeoulRepublic of Korea

Layered-type transition metal(TM)oxides are considered as one of the most promising cathodes for K-ion batteries because of the large theoretical gravimetric capacity by low molar ***,they suffer from severe structural change by de/intercalation and diffusion of K^(+)ions with large ionic size,which results in not only much lower reversible capacity than the theoretical capacity but also poor power ***,it is important to enhance the structural stability of the layered-type TM oxides for outstanding electrochemical behaviors under the K-ion battery ***,it is investigated that the substitution of the appropriate Ti^(4+)contents enables a highly enlarged reversible capacity of P3-type KxCrO_(2) using combined studies of first-principles calculation and various *** the pristine P3-type KxCrO_(2) just exhibits the reversible capacity of∼120 mAh g^(−1) in the voltage range of 1.5-4.0 V(vs.K^(+)/K),the∼0.61 mol K^(+)corresponding to∼150 mAh g^(−1) can be reversible de/intercalated at the structure of P3-type K0.71[Cr_(0.75)Ti_(0.25)]O_(2) under the same ***,even at the high current density of 788 mA g^(−1),the specific capacity of P3-type K0.71[Cr_(0.75)Ti_(0.25)]O_(2) is∼120 mAh g^(−1),which is∼81 times larger than that of the pristine P3-type KxCrO_(2).It is believed that this research can provide an effective strategy to improve the electrochemical performances of the cathode materials suffered by severe structural change that occurred during charge/discharge under not only K-ion battery system but also other rechargeable battery systems.

关键词： cathodes first-principles calculations layered-type oxide materials potassium-ion batteries structural stabilization

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