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Interfacial engineering through lead binding using crown ethers in perovskite solar cells

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Journal of Energy Chemistry 2024年第5期92卷 263-270页

作者： Sun-Ju kim YeonJu kim Ramesh Kumar Chitumalla Gayoung Ham Thanh-Danh Nguyen Joonkyung Jang Hyojung Cha Jovana Milić Jun-Ho Yum Kevin Sivula Ji-youn Seo Department of Nano Fusion Technology Pusan National UniversityBusan 46241Republic of Korea Laboratory for Molecular Engineering of Optoelectronic Nanomaterials Institute of Chemical Sciences and EngineeringÉcole Polytechnique Fédérale de Lausanne(EPFL)1015 LausanneSwitzerland Department of Energy Convergence and Climate Change Kyungpook National UniversityDaegu 41566Republic of Korea Department of Hydrogen and Renewable Energy Kyungpook National UniversityDaegu 41566Republic of Korea Adolphe Merkle Institute University of FribourgCH-1700 FribourgSwitzerland

In the domain of perovskite solar cells(PSCs),the imperative to reconcile impressive photovoltaic performance with lead-related issue and environmental stability has driven innovative *** study pioneers an approach that not only rectifies lead leakage but also places paramount importance on the attainment of rigorous interfacial *** ethers,notably benzo-18-crown-6-ether(B18C6),were strategically integrated at the perovskite-hole transport material *** ethers exhibit a dual role:efficiently sequestering and immobilizing Pb^(2+)ions through host-guest complexation and simultaneously establishing a robust interfacial passivation *** crown ether candidates,guided by density functional theory(DFT)calculations,demonstrated proficiency in binding Pb2+ions and optimizing interfacial *** devices incorporating these materials achieved exceptional power conversion efficiency(PCE),notably 21.7%for B18C6,underscoring their efficacy in lead binding and interfacial *** techniques,including time-of-flight secondary ion mass spectrometry(ToF-SIMS),ultraviolet photoelectron spectroscopy(UPS),time-resolved photoluminescence(TRPL),and transient absorption spectroscopy(TAS),unequivocally affirmed Pb^(2+)ion capture and suppression of non-radiative ***,these PSCs maintained efficiency even after enduring 300 h of exposure to 85%relative *** research underscores the transformative potential of crown ethers,simultaneously addressing lead binding and stringent interfacial passivation for sustainable PSCs poised to commercialize and advance renewable energy applications.

关键词： Perovskite solar cells Interfacial passivation Crown ether materials Stability

Flow Characteristics in Compact Thermal Spray Coating Systems with Minimum Length Nozzle

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Plasma Science and Technology 2009年第5期11卷 550-554页

作者： Seung-Hyun kim youn-jea kim School of Mechanical Engineering Sungkyunkwan University

In this study, numerical analysis is performed to adopt the equivalence ratio on the high velocity oxygen fuel （HVOF） thermal spray coating systems equipped with a minimum length nozzle. The analysis is applied to investigate the axisymmetric, steady-state, turbulent, and chemically combusting flow both within the torch and in a free jet region between the torch and the substrate to be coated. The combustion is modeled using a single-step and eddy-dissipation model which assumes that the reaction rate is limited by the turbulent mixing rate of the fuel and oxidant. As the diameter of the nozzle throat is increased, the location of the Mach shock disc moves backward from the nozzle exit. As the throat diameter and the divergent portion are 6 mm and 8 mm, respectively, the pressure in the HVOF system is the lowest at the chamber and the expanding gas is steadily maintained with both high velocity and high temperature for different equivalence ratios. Thus, relatively minor amendments of the equivalence ratio and the geometry of HVOF can lead to improved control over coating characteristics.

关键词： minimum length nozzle HVOF equivalence ratio

Brassinosteroids enhance salicylic acid-mediated immune responses by inhibiting BIN2 phosphorylation of clade I TGA transcription factors in Arabidopsis

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Molecular Plant 2022年第6期15卷 991-1007页

作者： Yeong-Woo kim Ji-Hyun youn Jeehee Roh Jeong-Mok kim Seong-Ki kim Tae-Wuk kim Department of Life Science Hanyang UniversitySeoul 04763Republic of Korea Department of Life Science Chung-Ang UniversitySeoul 06973Republic of Korea Research Institute for Convergence of Basic Science Hanyang UniversitySeoul 04763Republic of Korea Hanyang Institute of Bioscience and Biotechnology Hanyang UniversitySeoul 04763Republic of Korea

Salicylic acid (SA) plays an important role in plant immune response, including resistance to pathogens and systemic acquired resistance. Two major components, NONEXPRESSOR OF PATHOGENESIS-RELATED GENES (NPRs) and TGACG motif-binding transcription factors (TGAs), are known to mediate SA signaling, which might also be orchestrated by other hormonal and environmental changes. Nevertheless, the molecular and functional interactions between SA signaling components and other cellular signaling pathways remain poorly understood. Here we showed that the steroid plant hormone brassinosteroid (BR) promotes SA responses by inactivating BR-INSENSITIVE 2 (BIN2), which inhibits the redox-sensitive clade I TGAs in Arabidopsis. We found that both BR and the BIN2 inhibitor bikinin synergistically increase SA-mediated physiological responses, such as resistance to Pst DC3000. Our genetic and biochemical analyses indicated that BIN2 functionally interacts with TGA1 and TGA4, but not with other TGAs. We further demonstrated that BIN2 phosphorylates Ser-202 of TGA4, resulting in the suppression of the redox-dependent interaction between TGA4 and NPR1 as well as destabilization of TGA4. Consistently, transgenic Arabidopsis overexpressing TGA4-YFP with a S202A mutation displayed enhanced SA responses compared to the wild-type TGA4-YFP plants. Taken together, these results suggest a novel crosstalk mechanism by which BR signaling coordinates the SA responses mediated by redox-sensitive clade I TGAs.

关键词： brassinosteroid salicylic acid immune responses BIN2 clade I TGA

白术提取物对LPS诱导BV2细胞抗神经炎症作用

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中国处方药 2024年第2期22卷 60-64页

作者：李静金倫喆金洪光九江学院附属医院药剂科江西九江332000 韩国圆光大学药学院韩国益山54538 九江学院江西九江332000

目的研究白术甲醇-正己烷层萃取物(AH)对脂多糖(LPS)诱导的BV2细胞抗神经炎症作用及其相关机制,并分析AH主要成分。方法制备白术提取物;以高效液相色谱法(HPLC)分析AH主要成分;以LPS诱导BV2细胞建立炎症模型;以四甲基偶氮唑蓝(MTT)法检... 详细信息

目的研究白术甲醇-正己烷层萃取物(AH)对脂多糖(LPS)诱导的BV2细胞抗神经炎症作用及其相关机制,并分析AH主要成分。方法制备白术提取物;以高效液相色谱法(HPLC)分析AH主要成分;以LPS诱导BV2细胞建立炎症模型;以四甲基偶氮唑蓝(MTT)法检测细胞存活率;以Griess反应检测细胞上清液中NO水平;以ELISA法检测细胞上清液中前列腺素E_(2)(PGE_(2))、白细胞介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)水平;以Western Blot法检测环氧合酶-2(COX-2)、诱导型一氧化氮合酶(iNOS)、丝裂原活化蛋白激酶(MAPK)、核转录因子-κB(NF-κB)蛋白表达。结果AH主要成分包括白术内酯Ⅱ、Ⅲ。AH可显著降低LPS诱导BV2细胞产生的NO、PGE_(2)、IL-6、TNF-α水平,同时降低iNOS、COX-2、MAPK、NF-κB蛋白表达。低浓度AH对PGE_(2)的抑制作用不弱于高浓度白术内酯Ⅱ、Ⅲ;高浓度AH对NO的抑制作用与高浓度白术内酯Ⅲ相似。结论AH回收率高,主要成分包括白术内酯Ⅱ、Ⅲ;AH有较好的抗神经炎症作用,其抗炎机制与MAPK和NF-κB通路有关。

关键词：白术白术内酯Ⅱ 白术内酯Ⅲ 神经炎症

Robust vision-based displacement measurement and acceleration estimation using RANSAC and Kalman filter

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Earthquake Engineering and Engineering Vibration 2023年第2期22卷 347-358页

作者： Jongbin Won Jong-Woong Park Min-Hyuk Song youn-Sik kim Dosoo Moon Department of Civil and Environmental Engineering Chung-Ang UniversityDongjakSeoul 06974Korea Department of Smart Cities Chung-Ang UniversityDongjakSeoul 06974Korea R&D Division Tantan Safety co.LtdSeongdongSeoul 04798Korea Department of Civil and Environmental Engineering University of Hawaii at ManoaHonolulu 96822USA

Computer vision(CV)-based techniques have been widely used in the field of structural health monitoring(SHM)owing to ease of installation and cost-effectiveness for displacement *** paper introduces computer vision based method for robust displacement measurement under occlusion by incorporating random sample consensus(RANSAC).The proposed method uses the Kanade-Lucas-Tomasi(KLT)tracker to extract feature points for tracking,and these feature points are filtered through RANSAC to remove points that are noisy or *** the filtered feature points,the proposed method incorporates Kalman filter to estimate acceleration from velocity and displacement extracted by the *** validation,numerical simulation and experimental validation are *** the simulation,performance of the proposed RANSAC filtering was validated to extract correct displacement out of group of displacements that includes dummy displacement with noise or *** the experiment,both RANSAC filtering and acceleration measurement were validated by partially occluding the target for tracking attached on the *** results demonstrated that the proposed method successfully measures displacement and estimates acceleration as compared to a reference displacement sensor and accelerometer,even under occluded conditions.

关键词： computer vision structural displacement structural acceleration RANSAC Kalman filter

Epidural blood patch for spontaneous intracranial hypotension with subdural hematoma: A case report and review of literature

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World Journal of Clinical Cases 2022年第1期10卷 388-396页

作者： Se Hee Choi youn young Lee Won-Joong kim Anesthesiology and Pain Medicine Ewha Womans University Mokdong HospitalSeoul 07985South Korea Anesthesiology and Pain Medicine School of MedicineEwha Womans UniversitySeoul 07985South Korea

BACKGROUND Cerebrospinal fluid(CSF)leakage at C1/2 in spontaneous intracranial hypotension(SIH)is *** hematoma(SDH),a serious complication of SIH,may lead to neurological *** report presents a case of SDH after spontaneous C1/2 CSF leakage,which was treated with a targeted epidural blood patch(EBP).CASE SUMMARY A 60-year-old man with no history of trauma was admitted to our hospital with orthostatic headache,nausea,and *** computed tomography imaging revealed bilateral,subacute to chronic *** magnetic resonance imaging(MRI)findings were SDH with dural enhancement in the bilateral cerebral convexity and posterior fossa and mild sagging,suggesting *** the patient underwent burr hole trephination,the patient’s orthostatic headache was *** myelography led to a suspicion of CSF leakage at C1/***,we performed a targeted cervical EBP using an epidural catheter under fluoroscopic *** 5 d after EBP,a follow-up MR myelography revealed a decrease in the interval size of the CSF *** his symptoms improved,the patient still complained of headaches;therefore,we repeated the targeted cervical EBP 6 d after the initial ***,his headache had almost disappeared on the 8th day after the repeated *** Targeted EBP is an effective treatment for SDH in patients with SIH due to CSF leakage at C1/2.

关键词： Cerebrospinal fluid Chronic subdural hematoma Epidural blood patch Myelography Spontaneous intracranial hypotension Case report

One-step method to enhance biotribological properties and biocompatibility of DLC coating by ion beam irradiation

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Friction 2022年第7期10卷 1114-1126页

作者： Yuzhen LIU Kelun ZHANG Jae-Ho HAN youn-Hoo HWANG Shusheng XU Dae-Eun kim Department of Mechanical Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Dermatology and Cutaneous Biology Research Institute Yonsei University College of MedicineSeoul 03722Republic of Korea State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

A one-step method was developed to create a highly biocompatible micropatterned surface on a diamond-like carbon(DLC)through irradiation with a nitrogen ion beam and thus enhance the biocompatibility of osseointegrated surfaces and biotribological performance of articular *** biocompatibility and biotribological mechanisms were analyzed in terms of the structure and morphology of *** was demonstrated that a layer enriched in sp^(3) C-N bonds was formed on the surface of the DLC after nitrogen ion beam ***,with an increase in the radiation dose,the content of sp^(3) C-N on the DLC surface increased significantly,and the biocompatibility was positively correlated with *** adhesion of the MC3T3 osteoblasts increased significantly from 32%to 86%under an irradiation dose of 8×10^(15) ions/cm^(2).In contrast,the micropattern had a significant negative effect on the adhesion of the osteoblasts as it physically hindered cell expansion and *** micropattern with a depth of 37 nm exhibited good friction properties,and the coefficient of friction was reduced by 21%at relatively high speeds.

关键词： ion beam irradiation biocompatibility diamond-like carbon(DLC) in-vivo micropattern biotribological performance

Association of low muscle strength with metabolic dysfunctionassociated fatty liver disease:A nationwide study

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World Journal of Gastroenterology 2023年第45期29卷 5962-5973页

作者： Gyu Bae Lee youn Huh Sang Hyun Lee Byoungduck Han Yang-Hyun kim Do-Hoon kim Seon Mee kim youn Seon Choi Kyung Hwan Cho Ga Eun Nam Department of Family Medicine Korea University College of MedicineSeoul 02841South Korea Department of Family Medicine Uijeongbu Eulji Medical CenterEULJI UniversityDaejeon 11759South Korea School of Electrical Engineering Korea UniversitySeoul 02841South Korea

BACKGROUND There is limited evidence regarding the association between muscle strength and metabolic dysfunction-associated fatty liver disease(MAFLD).AIM To investigate the association between muscle strength and MAFLD in the general population in *** This nationwide representative cross-sectional study included 31649 individuals aged≥19 years who participated in the Korea National Health and Nutrition Examination Survey between 2015 and *** ratios(ORs)and 95%confidence intervals(95%CIs)for MAFLD according to sex-specific quartiles of muscle strength,defined by relative handgrip strength,were calculated using multivariable logistic regression ***,multivariable logistic regression analysis was used to assess the association between muscle strength and probable liver fibrosis in patients with *** Of all the participants,29.3%had *** prevalence of MAFLD was significantly higher in the lower muscle strength quartile groups for all participants,sexes,and age groups(P<0.001).A 1.92-fold(OR=1.92,95%CI:1.70–2.16)and 3.12-fold(OR=3.12,95%CI:2.64–3.69)higher risk of MAFLD was observed in the lowest quartile(Q1)group than in the other groups(Q2–Q4)and the highest quartile(Q4)group,*** ORs of MAFLD were significantly increased in the lower muscle strength quartile groups in a dose-dependent manner(P for trend<0.001).These associations persisted in both *** inverse association between muscle strength and the risk of MAFLD was observed in all subgroups according to age,obesity,and diabetes *** patients with MAFLD,the odds of severe liver fibrosis were higher in Q1(OR=1.83,95%CI:1.25–2.69)than in other groups(Q2–Q4).CONCLUSION Among Korean adults,low muscle strength was associated with an increased risk of MAFLD and liver fibrosis in patients with MAFLD.

关键词： Muscle strength Handgrip strength Metabolic dysfunction-associated fatty liver disease Liver fibrosis Korea National Health and Nutrition Examination Survey

FLOWERING LOCUS M isoforms differentially affect the subcellular localization and stability of SHORT VEGETATIVE PHASE to regulate temperature-responsive flowering in Arabidopsis

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Molecular Plant 2022年第11期15卷 1696-1709页

作者： Suhyun Jin Sun young kim Hendry Susila Zeeshan Nasim Geummin youn Ji Hoon Ahn Department of Life Sciences Korea UniversitySeoul 02841Republic of Korea

Temperature is an important environmental cue that affects flowering time in *** MADS-box transcription factor FLOWERING LOCUS M(FLM)forms a heterodimeric complex with SHORT VEGETATIVE PHASE(SVP)and controls ambient temperature-responsive flowering in ***-βand FLM-δ,two major splice variants produced from the FLM locus,exert opposite effects on flowering,but the molecular mechanism by which the interaction between FLM isoforms and SVP affects temperature-responsive flowering remains poorly ***,we show that FLM-βand FLM-δplay important roles in modulating the temperature-dependent behavior,conformation,and stability of *** localization of SVP decreases as temperature ***-βis required for SVP nuclear translocation at low temperature,whereas SVP interacts with FLM-δmainly in the cytoplasm at high *** preferentially binds to FLM-βat low temperature in tobacco leaf *** shows high binding affinity to FLM-βat low temperature and to FLM-δat high *** undergoes similar structural changes in the interactions with FLM-βand FLM-δ;however,FLM-δlikely causes more pronounced conformational changes in the SVP ***-δcauses rapid degradation of SVP at high temperature,compared with FLM-β,possibly via *** of lysine 53 or lysine 165 in SVP causes increased abundance of SVP due to reduced ubiquitination of SVP and thus delays flowering at high *** findings suggest that temperature-dependent differential interactions between SVP and FLM isoforms modulate the temperature-responsive induction of flowering in Arabidopsis.

关键词： flowering ambient temperature SVP FLM FLM-β FLM-δ nuclear translocation