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Defect-rich spinel ferrites with improved charge collection properties for efficient solar water splitting

Journal of Advanced Ceramics 2023年第3期12卷 612-624页

作者： Runfa Tan yoo Jae Jeong Qu Li Minje Kang In Sun Cho Department of Materials Science&Engineering Ajou UniversitySuwon 16499Republic of Korea Department of Energy Systems Research Ajou UniversitySuwon 16499Republic of Korea

Spinel zinc ferrite(ZnFe_(2)O_(4),ZFO)is a potential photoanode material for photoelectrochemical(PEC)water splitting because of its ideal bandgap(1.9–2.1 eV)and superior chemical stability in aqueous ***,the low charge collection efficiency significantly hinders the improvement in PEC ***,we report an ultrafast and effective flame activation route to enhance the charge collection properties of ***,high-temperature flame(>1300℃)facilitated surface and grain boundary diffusions,increasing the grain size and connectivity of the ZFO ***,the reducing atmosphere of the flame enabled the formation of surface defects(oxygen vacancy and Fe^(2+)),thereby increasing the charge carrier density and surface adsorption ***,these two factors promoted charge transport and transfer kinetics,resulting in a 10-fold increase in the photocurrent density over the unactivated ***,we deposited a thin Al_(2)O_(3)overlayer to passivate the ZFO surface and then the NiFeOx oxygen evolution catalyst(OEC)to expedite hole injection into the *** surface passivation and OEC deposition led to a remarkable photocurrent density of~1 mA/cm^(2)at 1.23 V versus the reversible hydrogen electrode,which is the highest value among all reported ZFO ***,the NiFeOx/Al_(2)O_(3)/F-ZFO photoanode achieved excellent photocurrent stability over 55 h(96%retention)and superior faradaic efficiency(FE>94%).Our flame activation method is also effective in improving the photocurrent densities of other spinel ferrites:CuFe_(2)O_(4)(93 times),MgFe_(2)O_(4)(16 times),and NiFe_(2)O_(4)(12 times).

关键词： spinel ferrites flame activation defect-rich surface charge collection photoelectrochemical(PEC) water splitting

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Structural performance of flexible freeform panelssubjected to wind loads

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Frontiers of Structural and Civil Engineering 2024年第6期18卷 851-869页

作者： Yong yoo Zaryab SHAHID Renzhe CHEN Maria KOLIOU Anastasia MULIANA Negar KALANTAR Zachry Department of Civil and Environmental Engineering Texas A&M UniversityCollege StationTX 77843USA J.Mike Walker'66 Department of Mechanical Engineering Texas A&M UniversityCollege StationTX 77843USA Architecture Division California College of the ArtsSan FranciscoCA 94107USA

An increased number of hurricanes and tornadoes have been recorded worldwide in the last decade,while research efforts to reduce wind-related damage to structures become *** architecture,which focuses on generating complex curved shapes including streamlined shapes,has recently gained *** study focuses on investigating the potential of kerf panels,which have unique flexibility depending on the cut patterns and densities,to generate complex shapes for facades and their performance under wind *** investigate the kerf panel's potential capacity against wind loads,static and dynamic analyses were conducted for two kerf panel types with different cut densities and pre-deformed *** was observed that although solid panels result in smaller displacement amplitudes,stresses,and strains in some cases,the kerf panels allow for global and local cell deformations resulting in stress reduction in various locations with the potential to reduce damage due to overstress in *** the predeformed kerf panels,it was observed that both the overall stress and strain responses in kerf cut arrangements were lower than those of the flat-shaped *** study shows the promise of the use of kerf panels in achieving both design flexibility and performance demands when exposed to service *** that this newly proposed architectural configuration(design paradigm)for facades could revolutionize structural engineering by pushing complex freeform shapes to a standard practice that intertwines aesthetic arguments,building performance requirements,and material design considerations has the potential for significant practical applications.

关键词： freeform structure kerfing method wind load analysis cladding component

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A novel deep learning framework with variational auto-encoder for indoor air quality prediction

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Frontiers of Environmental Science & Engineering 2024年第1期18卷 97-109页

作者： Qiyue Wu Yun Geng Xinyuan Wang Dongsheng Wang ChangKyoo yoo Hongbin Liu Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing 210037China College of Automation&College of Artificial Intelligence Nanjing University of Posts and TelecommunicationsNanjing 210023China Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control College of Light Industry and Food EngineeringGuangxi UniversityNanning 530004China Laboratory for Comprehensive Utilization of Paper Waste of Shandong Province Shandong Huatai Paper Co.Ltd.Dongying 257335China Department of Environmental Science and Engineering College of EngineeringKyung Hee UniversityYongin 446701Republic of Korea

Exposure to poor indoor air conditions poses significant risks to human health, increasing morbidity and mortality rates. Soft measurement modeling is suitable for stable and accurate monitoring of air pollutants and improving air quality. Based on partial least squares (PLS), we propose an indoor air quality prediction model that utilizes variational auto-encoder regression (VAER) algorithm. To reduce the negative effects of noise, latent variables in the original data are extracted by PLS in the first step. Then, the extracted variables are used as inputs to VAER, which improve the accuracy and robustness of the model. Through comparative analysis with traditional methods, we demonstrate the superior performance of our PLS-VAER model, which exhibits improved prediction performance and stability. The root mean square error (RMSE) of PLS-VAER is reduced by 14.71%, 26.47%, and 12.50% compared to single VAER, PLS-SVR, and PLS-ANN, respectively. Additionally, the coefficient of determination (R2) of PLS-VAER improves by 13.70%, 30.09%, and 11.25% compared to single VAER, PLS-SVR, and PLS-ANN, respectively. This research offers an innovative and environmentally-friendly approach to monitor and improve indoor air quality.

关键词： Indoor air quality PM_(2.5)concentration Variational auto-encoder Latent variable Soft measurement modeling

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Attenuation of seismic migration smile artifacts with deep learning

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Artificial Intelligence in Geosciences 2022年第1期3卷 123-131页

作者： Jewoo yoo Paul Zwartjes Aramco Overseas Company B.V the Netherlands

Attenuation of migration artifacts on Kirchhoff migrated seismic data can be challenging due to the relatively low amplitude of migration artifacts compared to reflections as well as the overlap in the kinematics of reflection and migration ***‘conventional’filtering methods exist and recently deep learning based workflows have been proposed.A deep learning workflow can be a simple and fast alternative to existing *** case of supervised training of a deep neural network using training data made by physics-based modelling or actual migrations is expensive and lacks diversity in terms of noise,amplitude,frequency content and *** can result in poor generalization beyond the training data without re-training and transfer *** this paper we demonstrate successful applications of migration smile separation using a conventional U-net *** novelty in our approach is that we do not use synthetic data created from physics-based modelling,but instead use only synthetic data build form basic geometric *** domain of application is the migrated common offset domain,or simply the stack of the pre-stack migrated data,where reflections resemble local geology and migration smiles are upward convex hyperbolic *** patterns were randomly perturbed in many ways while maintaining their intrinsic *** approach is inspired by the common practice of data augmentation in deep learning for machine vision *** many of the standard data augmentation techniques lack a geophysical motivation,we have instead perturbed our synthetic training data in ways to make more sense for a signal processing perspective or given our‘domain knowledge’of the problem at *** did not have to retrain the network to produce good results on the field *** large variety and diversity in examples enabled the trained neural network to show encouraging results on synthetic and field datasets that were not used in training.

关键词： Seismic data processing Noise attenuation Migration Deep learning U-net

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Inverse correlation between gastroesophageal reflux disease and atrophic gastritis assessed by endoscopy and serology

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World Journal of Gastroenterology 2022年第8期28卷 853-867页

作者： yoo Min Han Su Jin Chung Seokha yoo Jong In Yang Ji Min Choi Jooyoung Lee Joo Sung Kim Department of Internal Medicine and Healthcare Research Institute Seoul National University Hospital Healthcare System Gangnam CenterSeoul 06236South Korea Department of Anesthesiology and Pain Medicine Seoul National University College of MedicineSeoul 03080South Korea Department of Internal Medicine and Liver Research Institute Seoul National University College of MedicineSeoul 03080South Korea

BACKGROUND Helicobacter pylori(***)infection is known to prevent the occurrence of gastroesophageal reflux disease(GERD)by inducing gastric mucosal ***,little is known about the relationship between atrophic gastritis(AG)and *** To confirm the inverse correlation between AG and the occurrence and severity of *** Individuals receiving health checkups who underwent upper gastrointestinal endoscopy at Seoul National University Healthcare System Gangnam Center were *** grade of reflux esophagitis was evaluated according to the Los Angeles *** AG(EAG)was categorized into six *** AG(SAG)was defined as pepsinogen I≤70 ng/m L and pepsinogen I/II ratio≤*** association between the extent of EAG and SAG and the occurrence and severity of GERD was evaluated using multivariate logistic regression *** In total,4684 individuals with GERD were compared with 21901 healthy *** multivariate logistic regression analysis,advanced age,male sex,body mass index>23 kg/m2,presence of metabolic syndrome,current smoking,and alcohol consumption were associated with an increased risk of *** for *** immunoglobulin G antibodies was associated with a decreased risk of *** was an inverse correlation between the extent of EAG and occurrence of GERD:Odds ratio(OR),1.01[95%confidence interval(CI):0.90-1.14]in C1,0.87(0.78-0.97)in C2,0.71(0.62-0.80)in C3,0.52(0.44-0.61)in O1,0.37(0.29-0.48)in O2,and 0.28(0.18-0.43)in ***,the extent of EAG showed an inverse correlation with the severity of *** presence of SAG was correlated with a reduced risk of GERD(OR=0.49,95%CI:0.28-0.87,P=0.014).CONCLUSION The extent of EAG and SAG exhibited strong inverse relationships with the occurrence and severity of *** followed by *** infection may be independently protect against GERD.

关键词： Gastroesophageal reflux disease Reflux esophagitis Helicobacter pylori Atrophic gastritis Pepsinogen

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Comparison of microwave and conventional heating on physicochemical properties and phenolic profiles of purple sweetpotato and wheat flours

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Food Bioscience 2022年第2期46卷 923-933页

作者： Rongbin Cui Michelle Ji Yeon yoo Fan Zhu School of Chemical Sciences University of AucklandPrivate Bag 92019Auckland 1142New Zealand School of Science Faculty of Health and Environment SciencesAuckland University of TechnologyAucklandNew Zealand

The hydrothermal treatment assisted with microwaves on physicochemical properties and phenolic profiles of purple sweetpotato flour and wheat flour was studied and compared with those of conventional heat *** treatments significantly decreased the enthalpy change,pasting viscosity and gelling capacity of flours,while increasing particle size,gelatinization temperatures and content of resistant *** induced more severe damages on the starch granule morphology and crystallinity than conventional heat treatment,which could be attributed to the intensive friction and collision produced by electromagnetic *** total concentrations of hydroxycinnamic acid derivatives and anthocyanins in purple sweetpotato flour extracted using microwaves at 100℃ were 36%and 68%higher than those in the samples after conventional heat treatment at 100℃,*** waves caused a higher extent of cell damage due to sudden temperature rise during microwave ***,microwave treatment has potential to produce novel functionalities and nutritional values of flours and can be applied as an effective approach for other starch-based food products.

关键词： Ipomoea batatas Microwave heating Conventional heating Dielectric property Phenolics Resistant starch Cereal processing Starch gelatinization Domestic cooking

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Synthesis, characterization and electrocatalytic studies of palladium–manganese oxyhydroxide nanocomposite towards direct ethylene glycol fuel cell

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Chinese Science Bulletin 2014年第27期59卷 3413-3419页

作者： Ramanujam Kannan Ae Rhan Kim Dong Jin yoo R&D Education Center for Specialized Graduate School of Hydrogen and Fuel Cells Engineering Chonbuk National University Chonju Joellabuk-do 561-756 Korea Department of Energy Storage/Conversion Engineering Hydrogen and Fuel Cell Research Center Graduate SchoolChonbuk National University Chonju Joellabuk-do 561-756Korea Department of Chemistry Chonbuk National UniversityChonju Joellabuk-do 561-756 Korea

The palladium nanoparticle grafted manganese oxyhydroxide nanorod(MON) electrocatalyst has been synthesized and tested for the electrooxidation of ethylene glycol(EG) in an alkaline medium. The MON was prepared using the hydrothermal method and the Pd nanoparticles were coated on the MON using an in situ reduction method. The nanocatalyst thus prepared was characterized by powder X-ray diffraction, scanning electron microscopy, high resolution transmission electron microscopy, energy dispersive X-ray spectroscopy and electrochemical methods. The microscopic studies confirm the formation of MON and reveal that the Pd nanoparticles were grafted uniformly on the MON. In the voltammetric studies, the Pd/MON catalyst exhibited a six-fold improved peak current for ethylene glycol electrooxidation compared with the C/Pd. The EG electrooxidation reaction performances of the Pd/MON nanocatalyst in the alkaline solutions containing different quantities of EG were tested through cyclic voltammetry. The catalytic removal of the poisonous intermediates formed during electrooxidation of EG was explained. The present study shows that MON can act as an active support for the Pd nanocatalyst.

关键词：钯纳米粒子氢氧化锰乙二醇化学研究燃料电池纳米复合合成高分辨透射电子显微镜

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LongLine:Visual Analytics System for Large-scale Audit Logs

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Visual Informatics 2018年第1期2卷 82-97页

作者： Seunghoon yoo Jaemin Jo Bohyoung Kim Jinwook Seo Seoul National University Korea Hankuk University of Foreign Studies Korea

Audit logs are different from other software logs in that they record the most primitive events(i.e.,system calls)in modem operating *** logs contain a detailed trace of an operating system,and thus have received great attention from security experts and system ***,the complexity and size of audit logs,which increase in real time,have hindered analysts from understanding and analyzing *** this paper,we present a novel visual analytics system,LongLine,which enables interactive visual analyses of large-scale audit *** lowers the interpretation barrier of audit logs by employing human-understandable representations(e.g.,file paths and commands)instead of abstract indicators of operating systems(e.g.,file descriptors)as well as revealing the temporal patterns of the logs in a multi-scale fashion with meaningful granularity of time in mind(e.g.,hourly,daily,and weekly).LongLine also streamlines comparative analysis between interesting subsets of logs,which is essential in detecting anomalous behaviors of *** addition,LongLine allows analysts to monitor the system state in a streaming fashion,keeping the latency between log creation and visualization less than one ***,we evaluate our system through a case study and a scenario analysis with security experts.

关键词： Visual Analytics Log Visualization Multidimensional Data

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Antioxidant effect of indirect moxibustion on healthy subjects:a pilot study

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Journal of Traditional Chinese Medicine 2012年第4期32卷 590-595页

作者： Hyejung Park Hyeunggeug Kim Sara yoo Namhun Lee Changgue Son Liver and Immunology Research Center Daejeon Oriental Hospital of Oriental Medical College of Daejeon University22-5 Daehung-dongJung-guDaejeon 301-724Republic of Korea

OBJECTIVE:Moxibustion has long been thought to promote vital energy or immunity through clinical *** study aimed to investigate the clinical effects of indirect moxibustion on antioxidant and immunomodulation in a normal ***:Twenty-five healthy volunteers with no objective or subjective disorders were *** participants were treated with indirect moxibustion on acupoints Guanyuan(CV 4) and Shenque(CV 8) three times per week for 4 *** serum levels of reactive oxygen species(ROS) and malondialdehyde(MDA),the total antioxidant capacity(TAC),the activities of catalase and superoxide dismutase(SOD),and the total glutathione content were determined before and after the 12th *** subpopulations and 42 cytokines in the peripheral blood were analyzed using flow cytometry and antibody array,***:Compared with the initial time point,the serum levels of ROS and MDA were significantly lowered by moxibustion,while TAC was increased(P<0.01 for all).A significant increase was observed in catalase activity(P<0.05),but not in SOD or total *** were no significant changes in lymphocyte subpopulations or cytokines in the peripheral *** of 25 participants reported at least one symptom in which they felt subjective improvement after ***:Indirect moxibustion on acupoints CV 4 and CV 8 improved the antioxidant defense system,which may be a mechanism explaining the clinical effects of moxibustion.

关键词： Moxibustion Point CV 4 (Guanyuan) Point CV 8 (Shenque) Antioxidants Pilot projects

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Endometrial response to conceptus-derived estrogen and interleukin-1β at the time of implantation in pigs

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Journal of Animal Science and Biotechnology 2018年第3期9卷 531-547页

作者： Hakhyun Ka Heewon Seo Yohan Choi Inkyu yoo Jisoo Han Department of Biological Science and Technology Yonsei University Department of Veterinary Integrated Biosciences Texas A&M University College Station Department of Obstetrics and Gynecology University of Kentucky College of Medicine

The establishment of pregnancy is a complex process that requires a well-coordinated interaction between the implanting conceptus and the maternal uterus. In pigs, the conceptus undergoes dramatic morphological and functional changes at the time of implantation and introduces various factors, including estrogens and cytokines,interleukin-1β2(IL1 B2), interferon-γ(IFNG), and IFN-δ(IFND), into the uterine lumen. In response to ovarian steroid hormones and conceptus-derived factors, the uterine endometrium becomes receptive to the implanting conceptus by changing its expression of cell adhesion molecules, secretory activity, and immune response. Conceptus-derived estrogens act as a signal for maternal recognition of pregnancy by changing the direction of prostaglandin(PG) F2αfrom the uterine vasculature to the uterine lumen. Estrogens also induce the expression of many endometrial genes,including genes related to growth factors, the synthesis and transport of PGs, and immunity. IL1 B2, a pro-inflammatory cytokine, is produced by the elongating conceptus. The direct effect of IL1 B2 on endometrial function is not fully understood. IL1 B activates the expression of endometrial genes, including the genes involved in IL1 B signaling and PG synthesis and transport. In addition, estrogen or IL1 B stimulates endometrial expression of IFN signaling molecules,suggesting that estrogen and IL1 B act cooperatively in priming the endometrial function of conceptus-produced IFNG and IFND that, in turn, modulate endometrial immune response during early pregnancy. This review addresses information about maternal-conceptus interactions with respect to endometrial gene expression in response to conceptus-derived factors, focusing on the roles of estrogen and IL1 B during early pregnancy in pigs.

关键词： Conceptus Endometrium Estrogen Interleukin-1β Pig Uterus

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