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Electrochemical determination of the degree of atomic surface roughness in Pt-Ni alloy nanocatalysts for oxygen reduction reaction

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Carbon Energy 2021年第2期3卷 375-383页

作者： Tae-Yeol Jeon seung-ho Yu Sung J.Yoo Hee-Young Park Sang-Kyung Kim Beamline Department Pohang Accelerator Laboratory(PAL)PohangRepublic of Korea Department of Chemical and Biological Engineering Korea UniversitySeoulRepublic of Korea Fuel Cell Center Korea Institute of Science and Technology(KIST)SeoulRepublic of Korea Fuel Cell Research Center Korea Institute of Energy Research(KIER)DaejeonRepublic of Korea

Pt-Ni alloy nanocrystals with Pt-enriched shells were prepared by selective etching of surface Ni using sulfuric acid and *** changes in the electronic and geometric structure of the alloy nanoparticles at the surface were elucidated from the electrochemical surface area,the potential of zero total charge(PZTC),and relative surface roughness,which were determined from CO-and CO_(2)-displacement experiments before and after 3000 potential cycles under oxygen reduction reaction *** the highest activity and durability were achieved in hydroquinone-treated Pt–Ni,sulfuric acidtreated one showed the lower activity and durability despite its higher surface Pt concentration and alloying *** PZTC and QCO_(2)/QCO ratio(desorption charge of reductively adsorbed CO_(2) normalized by COad-stripping charge)depend on surface *** particular,QCO_(2)/QCO ratio change better reflects the roughness on an atomic scale,and PZTC is also affected by the electronic modification of Pt atoms in surface *** this study,a comparative study is presented to find a relationship between surface structure and electrochemical properties,which reveals that surface roughness plays a critical role to improve the electrochemical performance of Pt-Ni alloy catalysts with Pt-rich surfaces.

关键词： electrocatalyst fuel cell oxygen reduction reaction Pt-Ni surface roughness

Estimation of effective plant area index for South Korean forests using LiDAR system

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Science China(Life Sciences) 2010年第7期53卷 898-908页

作者： KWAK Doo-Ahn LEE Woo-Kyun KAFATOS Menas SON Yowhan Cho Hyun-Kook LEE seung-ho Department of Environmental Science and Ecological Engineering Korea University Center of Excellence in Earth Observing Schmid College of ScienceChapman University Division of Forest Resources Information Korea Forest Research Institute

Light Detection and Ranging(LiDAR) systems can be used to estimate both vertical and horizontal forest *** components,the leaves of trees and the understory can be described with high precision,using geo-registered *** on this concept,the Effective Plant Area Indices(PAIe) for areas of Korean Pine(Pinus koraiensis),Japanese Larch(Larix leptolepis) and Oak(Quercus spp.) were estimated by calculating the ratio of intercepted and incident LIDAR laser rays for the canopies of the three forest ***,the canopy gap fraction(GLiDAR) was generated by extracting the LiDAR data reflected from the canopy surface,or inner canopy area,using k-means *** LiDAR-derived PAIe was then estimated by using GLIDAR with the Beer-Lambert law.A comparison of the LiDAR-derived and field-derived PAIe revealed the coefficients of determination for Korean Pine,Japanese Larch and Oak to be 0.82,0.64 and 0.59,*** differences between field-based and LIDAR-based PAIe for the different forest types were attributed to the amount of leaves and branches in the forest *** absence of leaves,in the case of both Larch and Oak,meant that the LiDAR pulses were only reflected from *** probability that the LiDAR pulses are reflected from bare branches is low as compared to the reflection from branches with a high leaf *** is because the size of the branch is smaller than the resolution across and along the 1 meter LIDAR laser ***,a better predictive accuracy would be expected for the model if the study would be repeated in late spring when the shoots and leaves of the deciduous trees begin to appear.

关键词： leaf area index plant area index LiDAR k-means clustering gap fraction beer-lambert law

Estimated prevalence and trends in smoking among adolescents in South Korea,2005-2021:a nationwide serial study

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World Journal of Pediatrics 2023年第4期19卷 366-377页

作者： Hyoin Shin Sangil Park Hyunju Yon Chae Yeon Ban Stephen Turner Seong ho Cho Youn ho Shin Jung U.Shin Ai Koyanagi Louis Jacob Lee Smith Chanyang Min Young Joo Lee So Young Kim Jinseok Lee Rosie Kwon Min Ji Koo Guillaume Fond Laurent Boyer Jong Woo Hahn Namwoo Kim Sang Youl Rhee Jae Il Shin ho Geol Woo Hyeowon Park Hyeon Jin Kim Yoonsung Lee Man S.Kim Eléa Lefkir Vlasta Hadalin Jungwoo Choi seung Won Lee Dong Keon Yon Sunyoung Kim Department of Medicine Kyung Hee University College of MedicineSeoulSouth Korea Department of Neurology Kyung Hee University College of MedicineSeoulSouth Korea Maternity and Child Health Division NHS Grampian AberdeenAberdeenUK Division of Allergy-Immunology University of South Florida Morsani College of MedicineTampaFLUSA Department of Pediatrics CHA Gangnam Medical CenterCHA University School of MedicineSeoulSouth Korea Department of Dermatology CHA Bundang Medical CenterCHA University School of MedicineSeongnamSouth Korea Research and Development Unit Parc Sanitari Sant Joan de DeuCIBERSAMISCIIIBarcelonaSpain Catalan Institution for Research and Advanced Studies(ICREA) Pg.Lluis CompanysBarcelonaSpain Faculty of Medicine University of Versailles Saint-Quentin-en-YvelinesMontigny-Le-BretonneuxFrance Centre for Health Performance and WellbeingAnglia Ruskin UniversityCambridgeUK Center for Digital Health Medical Science Research InstituteKyung Hee University Medical CenterKyung Hee University College of Medicine23 Kyungheedae-RoDongdaemun-GuSeoul02447South Korea Department of Obstetrics and Gynecology Kyung Hee University College of MedicineSeoulSouth Korea Department of Otorhinolaryngology-Head and Neck Surgery CHA Bundang Medical CenterCHA University School of MedicineSeongnamSouth Korea Department of Biomedical Engineering Kyung Hee UniversityYonginSouth Korea Department of Biomedical Engineering University of MichiganAnn ArborMIUSA Department of Human Biology University of TorontoTorontoONCanada AP-HM Aix-Marseille Univ.CEReSS—Health Service Research and Quality of Life CenterMarseilleFrance FondaMental Foundation CreteilFrance Department of Pediatrics Seoul National University College of MedicineSeoulSouth Korea Department of Neuropsychiatry Seoul National University College of MedicineSeoulSouth Korea Department of Endocrinology and Metabolism Kyung Hee University School of MedicineSeoulSouth Korea Department of Pediatrics Yonsei University College of

Background Although smoking is classified as a risk factor for severe COVID-19 outcomes,there is a scarcity of studies on prevalence of smoking during the COVID-19 ***,this study aims to analyze the trends of prevalence of smoking in adolescents over the COVID-19 pandemic *** The present study used data from middle to high school adolescents between 2005 and 2021 who participated in the Korea Youth Risk Behavior Web-based Survey(KYRBS).We evaluated the smoking prevalence(ever or daily)by year groups and estimated the slope in smoking prevalence before and during the *** A total of 1,137,823 adolescents participated in the study[mean age,15.04 years[95%confidence interval(CI)15.03-15.06];and male,52.4%(95%CI 51.7-53.1)].The prevalence of ever smokers was 27.7%(95%CI 27.3-28.1)between 2005 and 2008 but decreased to 9.8%(95%CI 9.3-10.3)in 2021.A consistent trend was found in daily smokers,as the estimates decreased from 5.4%(95%CI 5.2-5.6)between 2005 and 2008 to 2.3%(95%CI 2.1-2.5)in ***,the downward slope in the overall prevalence of ever smokers and daily smokers became less pronounced in the COVID-19 pandemic period than in the pre-pandemic *** the subgroup with substance use,the decreasing slope in daily smokers was significantly more pronounced during the pandemic than during the pre-pandemic *** The proportion of ever smokers and daily smokers showed a less pronounced decreasing trend during the *** findings of our study provide an overall understanding of the pandemic's impact on smoking prevalence in adolescents.

关键词： Adolescent COVID-19 Daily smokers Ever smokers Pandemic Smoking

U-IMPACT:a universal 3D microfluidic cell culture platform

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Microsystems & Nanoengineering 2022年第6期8卷 113-124页

作者： seung-Ryeol Lee Youngtaek Kim Suryong Kim Jiho Kim Seonghyuk Park Stephen Rhee Dohyun Park Byungjun Lee Kyusuk Baek ho-Young Kim Noo Li Jeon Department of Mechanical Engineering Seoul National UniversitySeoulRepublic of Korea Qureator Incorporation San DiegoCAUSA Institute of Advanced Machines and Design Seoul National University SeoulRepublic of Korea Institute of Bioengineering Seoul National UniversitySeoulRepublic of Korea

The development of organs-on-a-chip has resulted in advances in the reconstruction of 3D cellular ***,there remain limitations regarding applicability and ***,we present an injection-molded plastic array 3D universal culture platform(U-IMPACT)for various biological applications in a single platform,such as cocultures of various cell types,and spheroids(e.g.,tumor spheroids,neurospheres)and tissues(e.g.,microvessels).The U-IMPACT consists of three channels and a spheroid zone with a 96-well plate form ***,organoids or spheroids(~500μm)can be located in designated areas,while cell suspensions or cellladen hydrogels can be selectively placed in three *** stable multichannel patterning,we developed a new patterning method based on capillary action,utilizing capillary channels and the native contact angle of the materials without any *** derived the optimal material hydrophilicity(contact angle of the body,45–90°;substrate,<30°)for robust patterning through experiments and theoretical *** demonstrated that the U-IMPACT can implement 3D tumor microenvironments for angiogenesis,vascularization,and tumor cell ***,we cultured neurospheres from induced neural stem *** U-IMPACT can serve as a multifunctional organ-on-achip platform for high-content and high-throughput screening.

关键词： organs culture capillary

Clinical course of ulcerative colitis patients who develop acute pancreatitis

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World Journal of Gastroenterology 2017年第19期23卷 3505-3512页

作者： Jong Wook Kim Sung Wook Hwang Sang Hyoung Park Tae Jun Song Myung-Hwan Kim ho-Su Lee Byong Duk Ye Dong-hoon yang Kyung-Jo Kim Jeong-Sik Byeon seung-Jae Myung Suk-Kyun yang Department of Internal Medicine Inje University Ilsan Paik Hospital Department of Gastroenterology University of Ulsan College of MedicineAsan Medical Center Department of Biochemistry and Molecular Biology University of Ulsan College of Medicine

AIM To investigate the clinical course of ulcerative colitis(UC)patients who develop acute *** We analyzed 3307 UC patients from the inflammatory bowel disease registry at Asan Medical Center from June 1989 to May *** clinical course of UC patients who developed acute pancreatitis was compared with that of non-pancreatitis UC *** Among 51 patients who developed acute pancreatitis,13(0.40%)had autoimmune,10(0.30%)had aminosalicylate-induced,and 13(1.73%)had thiopurineinduced *** 13 patients with autoimmune pancreatitis(AIP)had type 2 ***(15.4%)patients had pre-existing AIP,and three(23.1%)patients developed AIP and UC *** to non-pancreatitis patients,AIP patients had UC diagnosed at a significantly younger age(median,22.9 years vs 36.4 years;P=0.001).AIP and aminosalicylate-induced pancreatitis patients had more extensive UC compared to non-pancreatitis *** patients with pancreatitis recovered uneventfully,and there were no *** were used more frequently in aminosalicylate-and thiopurine-induced pancreatitis patients compared to non-pancreatitis patients[adjusted OR(95%CI),5.16(1.42-18.67)and6.90(1.83-25.98),respectively].Biologic utilization rate was similar among AIP and non-pancreatitis patients[OR(95%CI),0.84(0.11-6.66)].Colectomy rates for autoimmune,aminosalicylate-induced,and thiopurineinduced pancreatitis,and for non-pancreatitis patients were 15.4%(2/13),20%(2/10),15.4%(2/13),and7.3%(239/3256),respectively;the rates were not significantly different after adjusting for baseline disease *** Pancreatitis patients show a non-significant increase in colectomy,after adjusting for baseline disease extent.

关键词： Ulcerative 大肠炎胰腺炎自体免疫结肠切除术临床的路线

National trends in alcohol and substance use among adolescents from 2005 to 2021:a Korean serial cross‑sectional study of one million adolescents

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World Journal of Pediatrics 2023年第11期19卷 1071-1081页

作者： Sangil Park Hyunju Yon Chae Yeon Ban Hyoin Shin Seounghyun Eum seung Won Lee Youn ho Shin Jung UShin Ai Koyanagi Louis Jacob Lee Smith Chanyang Min AbdullahÖzgür Yeniova So Young Kim Jinseok Lee Vlasta Hadalin Rosie Kwon Min Ji Koo Guillaume Fond Laurent Boyer Sunyoung Kim Jong Woo Hahn Namwoo Kim Eléa Lefkir Victoire Bondeville Sang Youl Rhee Jae Il Shin Dong Keon Yon ho Geol Woo Department of Neurology Kyung Hee University Medical Center23 Kyungheedae‑roDongdaemun‑guSeoul 02447South Korea Department of Medicine Kyung Hee University College of MedicineSeoulSouth Korea Department of Precision Medicine Sungkyunkwan University School of MedicineSuwonSouth Korea Department of Pediatrics CHA Gangnam Medical CenterCHA University School of MedicineSeoulSouth Korea Department of Dermatology CHA Bundang Medical CenterCHA University School of MedicineSeongnamSouth Korea Research and Development Unit Parc Sanitari Sant Joan de DeuCIBERSAMISCIIIBarcelonaSpain Catalan Institution for Research and Advanced Studies(ICREA) Pg.Lluis CompanysBarcelonaSpain Faculty of Medicine University of Versailles Saint-Quentin-en-YvelinesMontigny‑le‑BretonneuxFrance Centre for Health Performance and WellbeingAnglia Ruskin UniversityCambridgeUK Center for Digital Health Medical Science Research InstituteKyung Hee University Medical CenterKyung Hee University College of MedicineSeoulSouth Korea Division of Gastroenterology Department of Internal MedicineFaculty of MedicineTokat Gaziosmanpaşa UniversityTokatTurkey Department of Otorhinolaryngology‑Head&Neck Surgery CHA Bundang Medical CenterCHA University School of MedicineSeongnamSouth Korea Department of Biomedical Engineering Kyung Hee UniversityYonginSouth Korea Faculty of Medicine University of LjubljanaLjubljanaSlovenia Department of Biomedical Engineering University of MichiganAnn ArborMIUSA Department of Human Biology University of TorontoTorontoONCanada AP-HM Aix-Marseille UniversityCEReSS-Health Service Research and Quality of Life CenterMarseilleFrance FondaMental Foundation CreteilFrance Department of Family Medicine Kyung Hee University College of MedicineSeoulSouth Korea Department of Pediatrics Seoul National University Bundang HospitalSeongnamSouth Korea Department of Neuropsychiatry Seoul National University HospitalSeoulSouth Korea Faculty of Medicine University of Rennes 1RennesFrance Department

Background Although previous studies have provided data on early pandemic periods of alcohol and substance use in adolescents,more adequate studies are needed to predict the trends of alcohol and substance use during recent periods,including the mid-pandemic *** study investigated the changes in alcohol and substance use,except tobacco use,throughout the pre-,early-,and mid-pandemic periods in adolescents using a nationwide serial cross-sectional survey from South *** Data on 1,109,776 Korean adolescents aged 13–18 years from 2005 to 2021 were obtained in a survey operated by the Korea Disease Control and Prevention *** evaluated adolescents’alcohol and substance consumption prevalence and compared the slope of alcohol and substance prevalence before and during the COVID-19 pandemic to see the trend *** define the pre-COVID-19 period as consisting of four groups of consecutive years(2005–2008,2009–2012,2013–2015,and 2016–2019).The COVID-19 pandemic period is composed of 2020(early-pandemic era)and 2021(midpandemic era).Results More than a million adolescents successfully met the inclusion *** weighted prevalence of current alcohol use was 26.8%[95%confidence interval(CI)26.4–27.1]from 2005 to 2008 and 10.5%(95%CI 10.1–11.0)in 2020 and *** weighted prevalence of substance use was 1.1%(95%CI 1.1–1.2)from 2005 to 2008 and 0.7%(95%CI 0.6–0.7)between 2020 and *** 2005 to 2021,the overall trend of use of both alcohol and drugs was found to decrease,but the decline has slowed since COVID-19 epidemic(current alcohol use:βdiff 0.167;95%CI 0.150–0.184;substance use:βdiff 0.152;95%CI 0.110–0.194).The changes in the slope of current alcohol and substance use showed a consistent slowdown with regard to sex,grade,residence area,and smoking status from 2005 to *** The overall prevalence of alcohol consumption and substance use among over one million Korean adolescents from the early and mid-stage(2020–2021)of the COVID

关键词： Alcohol Adolescent Corona virus disease 2019 South Korea Substance use

Comparative Study of Visual and Instrumental Analyses of Shade Selection

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Journal of Wuhan University of Technology(Materials Science) 2010年第1期25卷 62-67页

作者： Jee-Ha Choi Ju-Mi Park seung-Geun Ahn Kwang-Yeob Song Min-ho Lee Jae-Youn Jung Xinyu Wang Department of Prosthodontics and Institute of Oral Bioscience School of Dentistry Chonbuk National University Jeonju Republic of Korea Department of Dental Biomaterials and Institute of Oral Bioscience School of Dentistry Chonbuk National University Jeonju Republic of Korea Division of Mechanical & Aerospace System Engineering and RCIT Chonbuk National University Jeonju Republic of Korea Biomedical Materials and Engineering Research Center Wuhan University of Technology Wuhan 430070 China

The difference between visual and instrumental analyses of a shade selection on natural teeth was investigated. With visual analysis, five prosthodontist examined the middle third of the unrestored maxillary right central incisor of a patient using VITAPEN classical and Vita Toothguide 3D-MASTER tooth shade guide. In instrumental analysis, one prosthodontist examined the same teeth using a spectrophotometer （ShadepilotTM, Degudent, Hanau-Wolfgang, Germany, software 2.40）. Overall, instrumental analysis is more accurate and reproducible than a visual assessment. however, the difference is clinically acceptable.

关键词： shade selection visual analysis instrumental analysis spectrophotometer

Psychological predictors of bipolarity in panic disorder

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World Journal of Psychiatry 2021年第6期11卷 242-252页

作者： Da Hye Oh Doo-Heum Park seung-ho Ryu Jee Hyun Ha hong Jun Jeon Department of Psychiatry Konkuk University Medical CenterSeoul 05030South Korea Department of Psychiatry Konkuk University School of MedicineSeoul 05029South Korea

BACKGROUND Panic disorders frequently occur with affective disorders,particularly bipolar *** with panic disorder and bipolar disorder are more likely to present with severe symptoms,such as high rates of suicidal behavior,poor symptomatic and functional recovery,and poor drug *** To investigate the psychological characteristics of panic disorder patients related to *** A total of 254 patients(136 men and 118 women,mean age=33.48±3.2 years)who were diagnosed with panic disorder were included in the *** disorder with bipolarity(BP+)was defined as a score of≥7 on the Korean version of the Mood Disorder Questionnaire(K-MDQ),and a score lower than 7 was considered as a panic disorder without bipolarity(BP-).Self-report questionnaires were analyzed to examine their association with *** tests used in the study were the Mood Disorder Questionnaire(MDQ),Panic Disorder Severity Scale,Beck Depression Inventory,State-Trait Anxiety Inventory(STAI),Temperament and Character Inventory(TCI),and Minnesota Multiphasic Personality Inventory(MMPI).Statistical analyses were performed to evaluate the correlation between bipolarity of panic disorder patients and various psychological test results indicative of psychological *** Patients with a K-MDQ score of 7 or more were considered to have a history of manic or hypomanic episodes(BP+group,n=128),while patients with K-MDQ scores below 7 were defined as those without bipolarity(BP-group,n=126).The BP+group were more likely to be unmarried(single 56.2%vs 44.4%,P=0.008)and younger(30.78±0.59 vs 37.11±3.21,Phological assessment scales,such as the hypochondriasis,psychopathic deviate,masculinity-femininity,psychasthenia,schizophrenia,and hypomania(Ma)in MMPI,and novelty seeking,harm avoidance and self-transcendence in TCI,and STAI(state and trait)compared to the *** logistic

关键词： Panic disorder Bipolar disorder Bipolarity Anxiety Minnesota Multiphasic Personality Inventory Temperament and Character Inventory

Determination of phytosterols in <i>Oryza sativa</i>L. cultivars by liquid chromatography atmospheric chemical ionization time-of-flight mass spectrometer (LC-APCI-TOF-MS) coupled with a modified QuEChERS method

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Journal of Agricultural Chemistry and Environment 2012年第1期1卷 15-19页

作者： seung Rok Lee Dong Cheon Yun seung ho Lee Si Young yang In Seon Kim Division of Applied Bioscience and Biotechnology Institute of Environmentally-Friendly Agriculture College of Agriculture and Life Sciences Chonnam National University Gwangju Republic of Korea

Development of analytical methods for the determination of phytosterols in whole grains is one of growing interests due to their clinical and nutritional functions in human. In this study, we examined simultaneous determination of β-si tosterol, stigmasterol and campesterol in Korean rice cultivars by liquid chromatography atmospheric chemical ionization time-of-flight mass spectrometer (LC-APCI-TOF-MS). The hulled rice samples were extracted using a modified QuEChERS and analyzed by LC-APCI -TOF-MS. The method was validated by low limit of detection (LOD) and limit of quantification (LOQ) values and high recovery values with low relative standard deviation (RSD). The highest concentration of sitosterol was detected in Hwasung and Undu rice cultivars, exhibiting approximately 195.5 and 191.7 mg/Kg, respectively. Stigmasterol and campesterol were detected at the highest level in Hwasung rice cultivar, giving the concentrations of approximately 70.0 and 53.9 mg/Kg, respectively. Sitosterol was determined to be a main phytosterol detected in the rice samples. Our data demonstrated that LC/APCI-TOF- MS coupled with QuEChERS method can be used as a simple tool for the determination of phytosterols in rice samples.

关键词： Campesterol Phytosterols QuEChERS Sitosterol Stigmasterol Rice