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Unveiling anomalous lattice shrinkage induced by Pi-backbonding in Prussian blue analogues

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Journal of Energy Chemistry 2022年第7期31卷 121-128,I0004页

作者： Ju-Hyeon lee jin-gyu Bae Hyeon Jeong lee Ji Hoon lee School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Department of Materials University of OxfordOxford OX13PHUnited Kingdom

Transition-metal(TM)-based Prussian blue and its analogues(TM-PBAs) have attracted considerable attention as cathode materials owing to their versatile ion storage capability with tunable working voltages. TM-PBAs with different crystal structures, morphologies, and TM combinations can exhibit excellent electrochemical properties because of their unique and robust host frameworks with well-defined ionic diffusion channels. Nonetheless, there is still a lack of understanding regarding the performance dependence of TM-PBAs on structural changes during charging/discharging processes. In this study, in situ X-ray diffraction and X-ray absorption fine structure analyses elucidate the TMdependent structural changes in a series of TM-PBAs during the charging and discharging *** the discharging process, the lattice volume of Fe-PBA increased while those of Ni-and Cu-PBAs decreased. This discrepancy is attributed to the extent of size reduction of the cyanometallate complex([Fe(CN)_(6)]) via pi-backbonding from Fe to C due to redox flips of the low-spin Fe^(3+/2+) ion. This study presents a comprehensive understanding of how TM selection affects capacity acquisition and phase transition in TM-PBAs, a promising class of cathode materials.

关键词： Prussian blue analogues X-ray diffraction X-ray absorption fine structure Pi-backdonation Cyanides

Quasi-two-dimensional perovskite light emitting diodes for bright future

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Light(Science & Applications) 2021年第5期10卷 715-716页

作者： jin-Wook lee Nam-gyu Park SKKU Advanced Institute of Nanotechnology(SAINT)and Department of Nanoengineering Sungkyunkwan UniversitySuwon 16419Republic of Korea School of Chemical Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea

The fundamentals,promise and challenges of metal halide quasi-two-dimensional(quasi-2D)perovskites for a next generation emitter in light emitting diode devices are systematically reviewed.

关键词： diodes emitter emitting

Incorporation of Parameter Uncertainty into Spatial Interpolation Using Bayesian Trans-Gaussian Kriging

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Advances in Atmospheric Sciences 2015年第3期32卷 413-423页

作者： Joon jin SONG Soohyun KWON gyu Won lee Department of Statistical Science Baylor UniversityUSA Department of Astronomy and Atmospheric Sciences Research and Training Team for Future Creative Astrophysicists and Cosmologist Kyungpook National UniversityRepublic of Korea

Quantitative precipitation estimation （QPE） plays an important role in meteorological and hydrological ***-based telemetered rain gauges are widely used to collect precipitation *** interpolation methods are commonly employed to estimate precipitation fields covering non-observed *** is a simple and popular geostatistical interpolation method,but it has two known problems：uncertainty underestimation and violation of *** paper tackles these problems and seeks an optimal spatial interpolation for QPE in order to enhance spatial interpolation through appropriately assessing prediction uncertainty and fulfilling the required *** this end,several methods are tested：transformation,detrending,multiple spatial correlation functions,and Bayesian *** particular,we focus on a short-term and time-specific rather than a long-term and event-specific *** paper analyzes a stratiform rain event with an embedded convection linked to the passing monsoon front on the 23 August *** from a total of 100 automatic weather stations are used,and the rainfall intensities are calculated from the difference of 15 minute accumulated rainfall observed every 1 *** one-hour average rainfall intensity is then calculated to minimize the measurement random ***-validation is carried out for evaluating the interpolation methods at regional and local *** a result,transformation is found to play an important role in improving spatial interpolation and uncertainty assessment,and Bayesian methods generally outperform traditional ones in terms of the criteria.

关键词： precipitation kriging transformation Bayesian kriging detrend Korea

Identification and comparison of the local physicochemical structures of transition metal-based layered double hydroxides for high performance electrochemical oxygen evolution reactions

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Journal of Energy Chemistry 2023年第12期87卷 89-97,I0004页

作者： Min Sung Kim Bipin Lamichhane Ju-Hyeon lee jin-gyu Bae Jeong Yeon Heo Hyeon Jeong lee Shyam Kattel Ji Hoon lee School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea KNU Advanced Material Research Institute Kyungpook National UniversityDaegu 41566Republic of Korea Department of Materials Science and Engineering Ulsan National Institute of Science and TechnologyUlsan 44919Republic of Korea Department of Physics Florida A&M UniversityTallahasseeFlorida 32307United States

Layered double hydroxides(LDHs) have attracted considerable attention as a cost effective alternative to the precious iridium-and ruthenium-based electrocatalysts for an oxygen evolution reaction(OER),a bottleneck of water electrolysis for sustainable hydrogen *** their excellent OER performance,the structural and electronic properties of LDHs,particularly during the OER process,remain to be poorly *** this study,a series of LDH catalysts is investigated through in situ X-ray absorption fine structure analyses and density functional theory(DFT) *** experimental results reveal that the LDH catalyst with equal amounts of Ni and Fe(NF-LDH) exhibits the highest OER activity and catalytic life span when compared with its counterparts having equal amounts of Ni and Co(NC-LDH)and Ni only(Ni-LDH).The NF-LDH shows a markedly enhanced OER kinetics compared to the NC-LDH and the Ni-LDH,as proven by the lower overpotentials of 180,240,and 310 mV,respectively,and the Tafel slopes of 35.1,43.4,and 62.7 mV dec^(-1),*** DFT calculations demonstrate that the lowest overpotential of the NF-LDH is associated with the active sites located at the edge planes of NF-LDH in contrast to those located at the basal planes of Ni-LDH and *** current study pinpoints the active sites on various LDHs and presents strategies for optimizing the OER performance of the LDH catalysts.

关键词： Layered double hydroxides Oxygen evolution reaction In situ X-ray analyses Density functional theory Catalytic active sites

High-performance 110 kVp hard x-ray detector based on all-crystalline-surface passivated perovskite single crystals

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InfoMat 2024年第8期6卷 97-110页

作者： Juyoung Ko Beomjun Park Jangwon Byun Sandeep Pandey Ajin Jo Joo-Hong lee Wonho lee jin-Wook lee Nam-gyu Park Man-Jong lee Department of Chemistry Konkuk UniversitySeoulRepublic of Korea Advanced Crystal Material/Device Research Center Konkuk UniversitySeoulRepublic of Korea Health Science Research Center Korea UniversitySeoulRepublic of Korea Department of Nano Engineering and Department of Nano Science and Technology SKKU Advanced Institute of Nanotechnology(SAINT)Sungkyunkwan UniversitySuwonRepublic of Korea SKKU Institute of Energy Science&Technology(SIEST) Sungkyunkwan UniversitySuwonRepublic of Korea Department of Health and Environmental Science Korea UniversitySeoulRepublic of Korea School of Chemical Engineering Center for Antibonding Regulated CrystalsSungkyunkwan UniversitySuwonRepublic of Korea

Halide perovskite single crystals(SCs)have attracted much attention for their application in high-performance x-ray detectors owing to their desirable properties,including low defect density,high mobility–lifetime product(μτ),and long carrier diffusion ***,suppressing the inherent defects in perovskites and overcoming the ion migration primarily caused by these defects remains a *** study proposes a facile process for dipping Cs0.05FA0.9MA0.05PbI3 SCs synthesized by a solution-based inverse temperature crystallization method into a 2-phenylethylammonium iodide(PEAI)solution to reduce the number of defects,inhibit ion migration,and increase x-ray *** to conventional spin coating,this simple dipping process forms a two-dimensional PEA2PbI4 layer on all SC surfaces without further treatment,effectively passivating all surfaces of the inherently defective SCs and minimizing ion *** a result,the PEAI-treated perovskite SC-based x-ray detector achieves a record x-ray sensitivity of 1.3×10^(5)μC Gyair^(-1) cm^(-2) with a bias voltage of 30 V at realistic clinical dose rates of 1–5 mGy s^(-1)(peak potential of 110 kVp),which is 6 times more sensitive than an untreated SC-based detector and 3 orders of magnitude more sensitive than a commercialα-Se-based ***,the PEAI-treatedperovskite SC-based x-ray detector exhibits a low detection limit(73 nGy s^(-1)),improved x-ray response,and clear x-ray images by a scanning method,highlighting the effectiveness of the PEAI dipping approach for fabricating next-generation x-ray detectors.

关键词： 2D PEA2PbI4 layers clinical dose rates perovskite single crystals phenethylammonium iodide(PEAI) surface passivation x-ray sensitivity

Development of dilated cardiomyopathy with a long latent period followed by viral fulminant myocarditis:A case report

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World Journal of Clinical Cases 2022年第36期10卷 13451-13457页

作者： Seung Do lee Hyo jin lee Hye Ree Kim Min gyu Kang Kyehwan Kim Jeong Rang Park Division of Cardiology Department of Internal MedicineGyeongsang National University School of Medicine and Gyeongsang National University HospitalJinju 52727South Korea

BACKGROUND The clinical course of acute myocarditis ranges from the occurrence of a few symptoms to the development of fatal fulminant ***,fulminant myocarditis causes clinical deterioration very rapidly and *** long-term prognosis of myocarditis is varied,and it fully recovers without leaving any special ***,even after recovery,heart failure may occur and eventually progress to dilated cardiomyopathy(DCM),which causes serious left ventricular *** the case of follow-up observation,no clear guidelines have been *** SUMMARY We report the case of a 21-year-old woman who presented with *** became hemodynamically unstable and showed sustained fatal arrhythmias with decreased heart *** was clinically diagnosed with fulminant myocarditis based on her echocardiogram and cardiac magnetic resonance *** 2 d,she was readmitted to the emergency department under cardiopulmonary resuscitation and received mechanical ventilation and extracorporeal membrane *** implantable cardioverter defibrillator was inserted for secondary *** recovered and was *** to being hospitalized for sudden cardiac function decline and arrhythmia,she had been well for 7 years without any *** was finally diagnosed with dilated *** DCM may develop unexpectedly in patients who have been cured of acute fulminant myocarditis and have been stable with a long period of ***,they should be carefully and regularly observed clinically throughout long-term follow-up.

关键词： Myocarditis Fulminant Dilated cardiomyopathy Outcome Remission Case report

STUDY ON DRILLING CHARACTERISTICS AND MECHANICAL PROPERTIES OF CFRP COMPOSITES

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Acta Mechanica Solida Sinica 2008年第4期21卷 364-368页

作者： Seung-Chul lee Seong-Taek Jeong Jong-Nam Park Sun-jin Kim gyu-Jae Cho Department of Mechanical Engineering Chosun UniversityGraduate SchoolGwangjuKorea Small Business Corporation GwangjuKorea Department of Computer Mechanic Chosun College of Science & TechnologyGwangjuKorea Department of Fire Safety Management Seokang CollegyGwangjuKorea Department of Mechanical Engineering Chosun UniversityGwangjuKorea

Stacking plates of CFRP composite materials are increasingly used because of their unique characteristics. However, unlike other materials used in metallurgy they have a disadvantage of uneven quality and anisotropy when combined with other composites. Hence, specimens of CFRP stacking plates are manufactured by changing orientation angles throughout three quasiisotropic plies （0°/45°/90°/-45°）68, （03°/453°/903°/-453°）2s, and （06°/456°/906°/-456°）s and throughout three cross plies （0°/90°/0°/90°）68, （03 °/903 °/03°/903°）2s, and （06 °/906 °/06°/906°）8 In this study 3-point bending tests and transverse bending tests have been carried out in order to find out mechanical characteristics according to orientation angles by stacking in 6 different types along with the change of stacking composition method of a CFRP composite.

关键词： composite materials stacking plates

Health behaviors of Korean adults with hepatitis B:Findings of the 2016 Korean National Health and Nutrition Examination Survey

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World Journal of Gastroenterology 2018年第28期24卷 3163-3170页

作者： Yu-Hyeon Yi Yun-jin Kim Sang-Yeoup lee Byung-Mann Cho Young-Hye Cho Jeong-gyu lee Department of Family Medicine Pusan National University School of Medicine Medical Research Institute Pusan National University Hospital Busan Tobacco Control Center Pusan National University Hospital Department of Medical Education Pusan National University School of Medicine Family Medicine Clinic Pusan National University Yangsan Hospital Department of Preventive Medicine and Occupational Medicine Pusan National University School of Medicine

AIM To assess the frequencies of five health-related behaviors(smoking, alcohol consumption, body weight, sleep dura-tion, and physical activity) in Korean adults with chronic hepatitis *** Data were obtained from the 2016 Korean National Health and Nutrition Examination Survey. In total, 5887 subjects(2568 males, 3319 females) over 19 years old were enrolled in this study. Interviews were performed to obtain information on demographic characteristics and medical conditions. A self-administered questionnaire and medical examination were used to assess the smoking history, alcohol use, physical activity, sleep duration, and body weight of the subjects. Chronic hepatitis B was diagnosed based on detection of hepatitis B surface antigen(HBs Ag). The subjects were categorized into HBs Ag positive and negative groups, and a complex sampling analysis was conducted to compare the health behaviors between these *** Among males, the current smoking rate in the HBs Ag positive group was higher than that in the negative group(45.5% vs 38.5%). In the positive group, the rates of monthly and high-risk alcohol use were 70.4% and 17.6% in males and 45.9% and 3.8% in females, respectively. The rate of alcohol use was similar between the two groups [P = 0.455(males) and P = 0.476(females)]. In the HBs Ag positive group, 32.3% and 49.9% of males and 26.5% and 49.6% of females were overweight and physically inactive, respectively. High-risk alcohol consumption and physical inactivity were significantly associated with self-perceived health *** Our data demonstrate that a large proportion of Korean adults with chronic hepatitis B have poor health behaviors. Further studies are needed to confirm our results.

关键词： Health behavior Self-perceived health status Hepatitis Health risk behavior Health status

Liver function alterations after laparoscopy-assisted gastrectomy for gastric cancer and its clinical significance

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World Journal of Gastroenterology 2011年第3期17卷 372-378页

作者： Gui-Ae Jeong gyu-Seok Cho Eung-jin Shin Moon-Soo lee Hyung-Chul Kim Ok-Pyung Song Department of Surgery Soonchunhyang University College of Medicine

AIM: To evaluate the factors associated with liver function alterations after laparoscopy-assisted gastrectomy (LAG) for gastric cancer. METHODS: We collected the data of gastrectomy patients with gastric cancer and divided them into 2 groups: open gastrectomy (OG) and LAG. We also collected the data of patients with colon cancer to evaluate the effect of liver manipulations during surgery on liver function alterations. Serum aspartate aminotransferase (AST), alanine aminotransferase (ALT), total bilirubin, and alkaline phosphatase were measured on the preoperative day and postoperative day 1 (POD1), POD3, POD5, and POD7. RESULTS: No changes in liver function were observed after the operation in patients with colon cancer (n = 121). However, in gastric cancer patients (n = 215), AST and ALT levels increased until POD5 compared to those in colon cancer patients and these findings were observed both in the LAG and OG without a significant difference except at POD1. The mean hepatic enzyme levels at POD1 in the LAG group were significantly higher than those in the OG group (P = 0.047 for AST and P = 0.039 for ALT). The factors associated with elevated ALT on POD1 in patients with gastric cancer were body mass index (P < 0.001), operation time (P < 0.001), intraoperative hepatic injury (P = 0.048), and ligation of an aberrant left hepatic artery (P = 0.052) but not type of operation (OG vs LAG, P = 0.094). CONCLUSION: We conclude that the liver function alteration after LAG may have been caused by direct liver manipulation or aberrant hepatic artery ligation rather than the CO2 pneumoperitoneum.

关键词： Gastric cancer Liver function Pneumoperitoneum Laparoscopy-assisted gastrectomy