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Recent Advances in Patterning Strategies for Full‑Color Perovskite Light‑Emitting Diodes

Nano-Micro Letters 2024年第3期16卷 99-137页

作者： gwang heon lee Kiwook Kim Yunho Kim Jiwoong Yang Moon Kee Choi Graduate School of Semiconductor Materials and Devices Engineering Center for Future Semiconductor Technology(FUST)Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Republic of Korea Energy Science and Engineering Research Center Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Republic of Korea Department of Materials Science and Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea Center for Nanoparticle Research Institute for Basic Science(IBS)Seoul 08826Republic of Korea

Metal halide perovskites have emerged as promising light-emitting materials for next-generation displays owing to their remarkable material characteristics including broad color tunability,pure color emission with remarkably narrow bandwidths,high quantum yield,and solution *** recent advances have pushed the luminance efficiency of monochromic perovskite light-emitting diodes(PeLEDs)to their theoretical limits,their current fabrication using the spincoating process poses limitations for fabrication of full-color *** integrate PeLEDs into full-color display panels,it is crucial to pattern red–green–blue(RGB)perovskite pixels,while mitigating issues such as cross-contamination and reductions in luminous ***,we present state-of-the-art patterning technologies for the development of full-color ***,we highlight recent advances in the development of efficient ***,we discuss various patterning techniques of MPHs(i.e.,photolithography,inkjet printing,electron beam lithography and laserassisted lithography,electrohydrodynamic jet printing,thermal evaporation,and transfer printing)for fabrication of RGB pixelated *** patterning techniques can be classified into two distinct approaches:in situ crystallization patterning using perovskite precursors and patterning of colloidal perovskite *** review highlights advancements and limitations in patterning techniques for PeLEDs,paving the way for integrating PeLEDs into full-color panels.

关键词： Perovskite Light-emitting diode Full-color display High-resolution patterning Electroluminescence

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Aligned Ion Conduction Pathway of Polyrotaxane‑Based Electrolyte with Dispersed Hydrophobic Chains for Solid‑State Lithium–Oxygen Batteries

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Nano-Micro Letters 2025年第2期17卷 169-186页

作者： Bitgaram Kim Myeong‑Chang Sung gwang‑Hee lee Byoungjoon Hwang Sojung Seo Ji‑Hun Seo Dong‑Wan Kim Department of Materials Science and Engineering Korea University145 Anam‑RoSeongbuk‑GuSeoul 02841Republic of Korea School of Civil Environmental and Architectural EngineeringKorea University145 Anam‑RoSeongbuk‑GuSeoul 02841Republic of Korea Materials Science and Chemical Engineering Center Institute for Advanced Engineering(IAE)Yongin 17180Republic of Korea

A critical challenge hindering the practical application of lithium–oxygen batteries(LOBs)is the inevitable problems associated with liquid electrolytes,such as evaporation and safety *** study addresses these problems by proposing a modified polyrotaxane(mPR)-based solid polymer electrolyte(SPE)design that simultaneously mitigates solvent-related problems and improves ***-SPE exhibits high ion conductivity(2.8×10^(−3)S cm^(−1)at 25℃)through aligned ion conduction pathways and provides electrode protection ability through hydrophobic chain *** this mPR-SPE into solid-state LOBs resulted in stable potentials over 300 *** situ Raman spectroscopy reveals the presence of an LiO_(2)intermediate alongside Li_(2)O_(2)during oxygen *** situ X-ray diffraction confirm the ability of the SPE to hinder the permeation of oxygen and moisture,as demonstrated by the air permeability *** present study suggests that maintaining a low residual solvent while achieving high ionic conductivity is crucial for restricting the sub-reactions of solid-state LOBs.

关键词： Solid polymer electrolyte Lithium-oxygen batteries Polyrotaxane ion conductivity Hydrophobic chain

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A Review on Soft Ionic Touch Point Sensors

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Energy & Environmental Materials 2024年第6期7卷 193-208页

作者： Gibeom lee Donghyun lee gwang-Bum Im Younghoon lee Department of Mechanical Engineering Gachon University1342 SeongnamdaeroSujeong-guSeongnam 13120South Korea Department of Surgery Harvard Medical SchoolBostonMassachusetts 02115USA

A touch sensor is an essential component in meeting the growing demand for human-machine *** sensors have been developed in wearable,attachable,and even implantable forms to acquire a wide range of information from *** be applied to the human body,sensors are required to be biocompatible and not restrict the natural movement of the *** materials are a promising candidate for soft touch sensors due to their outstanding properties,which include high stretchability,transparency,ionic conductivity,and ***,this review discusses the unique features of soft ionic touch point sensors,focusing on the ionic material and its key role in the *** touch sensing mechanisms include piezocapacitive,piezoresistive,surface capacitive,piezoelectric,and triboelectric and triboresistive *** review analyzes the implementation hurdles and future research directions of the soft ionic touch sensors for their transformative potential.

关键词： iontronics ionic materials soft materials touch sensors

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Globus pharyngeus:A review of its etiology,diagnosis and treatment

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World Journal of Gastroenterology 2012年第20期18卷 2462-2471页

作者： Bong Eun lee gwang Ha Kim Department of Internal Medi cine Pusan National University School of Medicine and Biomedical Research InstitutePusan National University Hospital Busan 602-739South Korea

Globus is a persistent or intermittent non-painful sensation of a lump or foreign body in the *** is a commonly encountered clinical condition that is usually long-lasting,difficult to treat,and has a tendency to ***,due to the uncertain etiology of globus,it remains difficult to establish standard investigation and treatment strategies for affected patients. As a first step for managing globus,careful history taking and nasolaryngoscopy are *** the benign nature of the condition and the recent notion that gastroesophageal reflux disease is a major cause of globus,empirical therapy with a high dose of proton pump inhibitors is reasonable for patients with typical *** patients are nonresponsive to this therapy, definitive assessments such as endoscopy,multichannel intraluminal impedance/pH monitoring,and ma-nometry should be *** and language therapy,anti-depressants,and cognitive-behavioral therapy can be helpful in patients whose symptoms persist despite negative investigations.

关键词： Diagnosis Gastroesophageal reflux disease Globus Proton pump inhibitor Treatment

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Antidepressant-Like Effects of Hesperidin in Animal Model of Post-Traumatic Stress Disorder

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Chinese Journal of Integrative Medicine 2021年第1期27卷 39-46页

作者： Bombi lee gwang Muk Choi Bongjun Sur Acupuncture and Meridian Science Research Center College of Korean MedicineKyung Hee UniversitySeoul(02447)Republic of Korea Center for Converging Humanities Kyung Hee UniversitySeoul(02447)Republic of Korea The Graduate School of Basic Science of Medicine College of MedicineKyung Hee UniversitySeoul(02447)Republic of Korea Dopartmont of Molcoular Mcdicine and TIDRC School of MedicineEwha Womans UniversitySeoul(07985)Republic of Korea

Objective:Post-traumatic stress disorder(PTSD)is a psychiatric disorder characterized by depression and anxiety,that arises due to an imbalance of neurotransmitters in response to excessive ***(HSD)is a naturally occurring flavonoid shown to exert a variety of biological activities,including antioxidant,anti-inflammatory,and neuroprotective ***:This study was used the open field test(OFT)and forced swimming test(FST)to examine the effects of HSD on the depression-like response of rats after exposure to a single prolonged stress(SPS)leading to the dysregulation of the serotonergic activation *** rats were given HSD(20,50,and 100 mg/kg,intraperitoneal injection,n=6–7 per group)once daily for 14 days after exposure to *** influence of administration of HSD on SPS-induced behavioral responses and concentrations of serotonin(5-HT),5-hydroxyindoleacetic acid(5-HIAA),and monoamine oxidase-A(MAO-A)in the rat brain were also investigated using enzyme-linked immunoassays(ELISAs).Results:Daily HSD administration significantly improved depression-like behaviors in the FST(P<0.05),increased the number of lines crossed in the central zone of the OFT(P<0.01),and reduced freezing behavior both in contextual and cued fear *** treatment also attenuated the reduction in SPS-induced 5-HT concentrations in the hippocampus and *** increase in 5-HT concentrations during HSD treatment was partially attributed to a decrease in the 5-HIAA/5-HT ratio in the hippocampus of rats with ***,HSD treatment inhibited activity of MAO-A and decreases of tryptophan hydroxylase-1 expression in the ***:HSD was shown to exert antidepressant effects in rats exposed to SPS,suggesting that this natural flavonoid may be an effective medicine for PTSD.

关键词： hesperidin post-traumatic stress disorder depression serotonin

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Assessing land use/land cover change impacts on the hydrology of Nyong River Basin, Cameroon

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Journal of Mountain Science 2020年第1期17卷 50-67页

作者： EWANE Basil Ewane heon Ho lee Department of Geography Faculty of Social and Management SciencesUniversity of BueaP.O.BOX 63 BueaCameroon Department of Forest Resources College of Natural ResourcesYeungnam University280 Daehak-roGyeongsanSouth Korea

Uncontrolled land use land cover change(LULCC) is impacting watershed hydrology,particularly in tropical watersheds in developing countries. We assessed the extent of LULCC in the southern portion of the Nyong River basin through analysis of three land use maps in 1987, 2000 and2014. LULCC impact on hydrological variables of the Mbalmayo, Olama, Pont So’o, Messam, and Nsimi sub-watersheds of the southern portion of the Nyong River basin were evaluated by using the linear regression modeling and the Mann-Kendall test. This study reveals that dense forest cover decreased by16%, young secondary forest increased by 18%,agricultural/cropland increased by 10%, and built-up area/bare soil increased by 3% from 1987 to *** decrease in dense forest cover at 0.6% per year on average was driven by indiscriminate expansion of subsistence agricultural/cropland through shifting and fallow cultivation farming systems. Nonsignificant trends in total discharge, high flows, and low flows were observed in the large sub-watersheds of Mbalmayo and Olama from 1998 to 2013 with LULCC within the watershed. In contrast, significant decreasing trends in stream discharge(up to-5.1%and-5.9%), and significant increasing trends in high flows(up to 2.1% and 6.3%), respectively, were observed in the small sub-watersheds of Pont So’o and Messam from 1998 to 2013, particularly with increase in agricultural/cropland cover and decrease in dense forest cover. However, we found nonsignificant trends in mean annual discharge and low flows for all and whole watershed with LULCC. The results reveal spatially varying trends of stream discharge, low flows and high flows among the subwatersheds with LULCC within the study *** results suggest that the impacts of LULCC on watershed hydrology are easily detected in small subwatersheds than in large sub-watersheds. Therefore,the magnitude of dense forest cover loss must be significantly greater than 16% to cause significant changes and common trends

关键词： LULCC Land cover Land use Stream discharge Linear regression modeling Nyong River basin Mann-Kendall test

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Tree-ring reconstruction of streamflow for Palgong Mountain forested watershed in southeastern South Korea

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Journal of Mountain Science 2017年第1期14卷 60-76页

作者： EWANE Basil Ewane heon-Ho lee Department of Forest Resources College of Natural Resources Yeungnam University 280 Daehak-ro Gyeongsan-si Gyeongsangbuk-do 712-749 South Korea

Tree-ring chronologies from pine,oak and black locust tree species were used to reconstruct annual streamflow and examine hydrological drought years for Palgong Mountain forested watershed in southeastern South Korea for the period from 1954-2015. The backward elimination multiple regression analysis provided the statistically significant predictor chronologies of streamflow. The final calibration and verification test models accounted for 84.8% and 81.6%,respectively,of the variability in streamflow observed in the gage data. Further verification of the validity of the reconstructed model was undertaken with the Pearson Correlation Coefficient,the Reduction of Error Test,and the Durbin-Watson Statistics and indicated fidelity of the model for reconstructing the annual streamflow. Analyses of the reconstructed annual streamflow indicate that the most persistent years of high flows above the median annual discharge occurred from *** period included 7 single or multiple years of highest flow above the 90 th percentile discharge and multiple years of high flows with a time interval of 2-6 years,although with intervening multiple years of low flows below the 10 th and 50 th percentile. In comparison,the most persistent years of low flows below the median annual discharge occurred from 1954-1985 and 2009-2015. This period included 8 single or multiple years of lowest flow below the 10 th percentiledischarge and multiple years of low flows with a time interval of 2-9 years,although also with intervening multiple years of high flows above the 50 th percentile. No single years of extreme hydrological droughts below the 10 th percentile were identified from 1986-2015 whereas a greater proportion of high flows above the 90 th percentile occurred during this period. The persistent single or multiple years of lowest flows between 1954 and 1985 were the recent most critical hydrological drought years identified in the Palgong Mountain forested watershed providing supp

关键词： Climate variability Hydrological droughts High flows P densiflora Q mongolica Streamflow Tree ring

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Influence of vegetation cover and other sources of variability on sediment and runoff response in a burned forest in South Korea

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Journal of Mountain Science 2017年第2期14卷 296-315页

作者： EWANE Basil Ewane lee heon-Ho Department of Forest Resources College of Natural ResourcesYeungnam University280 Daehak-roGyeongsan-siGyeongsangbuk-do712-749South Korea

Post-fire field measurements of sediment and run off yield were undertaken in natural rainfall event-basis during five rainy months in Korea on a total of 15 small plots: four replica burned unseeded plots, six replica burned seeded plots, and five replica unburned plots. The main aim was to evaluate the effects of vegetation recovery and spatial distribution patterns on sediment and runoff response between and within the treatment replica erosion plots. Sixyears after the wildfire, total sediment and runoff yield in the burned unseeded plots with 20%-30%vegetation cover was still 120.8 and 20.6 times higher than in the unburned treatment plots with 100%ground cover, 8.3 and 6.7 times higher than in the burned seeded plots with 70%-80% vegetation cover,while only 1.6 and 2.0 times higher than in the burned seeded plots with 50%-60% vegetation cover,respectively. The differences in sediment and runoff yield between the treatment plots was proportional to total vegetation cover, distance of bare soil to vegetation cover, magnitude of rainfall characteristics and changes in soil properties, but not slope *** out of the six within-treatment pairs of two replica plots showed large differences in sediment and runoff yield of up to 6.0 and 4.2 times and mean CV of up to 99.1% and 62.2%, respectively. This was due to differences in the spatial distribution patterns of surface cover features, including aggregation of vegetation and litter covers, the distance of bare soil exposed to vegetation cover closer to the plot sediment collector and micro topographic mounds and sinks between pairs of replica plots. Small differences in sediment and runoff of only 0.9-1.4folds and mean CV of 8.6%-25% were observed where the within-treatment pairs of replica plots had similar slope, total surface cover components and comparable spatial distribution pattern of vegetation and bare soil exposed surface covers. The results indicated that post-fire hillslopes undergoing effective

关键词： Bare soil exposed Vegetation cover Post-fire Soil erosion Spatial distribution patterns Replica erosion plots

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Dielectric Barrier Discharge Plasma-Induced Photocatalysis and Ozonation for the Treatment of Wastewater

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Plasma Science and Technology 2008年第1期10卷 100-105页

作者： MOK YoungSun JO Jin-Oh lee heon-Ju Department of Chemical Engineering Cheju National University Jeju 690-756 South Korea Department of Energy Engineering Cheju National University Jeju 690-756 South Korea

The physicochemical processes of dielectric barrier discharge （DBD） such as insitu formation of chemically active species and emission of ultraviolet （UV）/visible light were utilized for the treatment of a simulated wastewater formed with Acid Red 4 as the model organic contaminant. The chemically active species （mostly ozone） produced in the DBD reactor were well distributed in the wastewater using a porous gas diffuser, thereby increasing the gas-liquid contact area. For the purpose of making the best use of the light emission, a titanium oxide-based photocatalyst was incorporated in the wastewater treating system. The experimental parameters chosen were the voltage applied to the DBD reactor, the initial pH of the wastewater, and the concentration of hydrogen peroxide added to the wastewater. The results have clearly shown that the present system capable of degrading organic contaminants in two ways （photocatalysis and ozonation） may be a promising wastewater treatment technology.

关键词： dielectric barrier discharge ozone ultraviolet light photocatalyst wastewater

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Cloning,expression in Escherichia coli,and enzymatic properties of laccase from Aeromonas hydrophila WL-11

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Journal of Environmental Sciences 2010年第4期22卷 635-640页

作者： Jing Wu Kyoung-Sook Kim Jai-heon lee Young-Choon lee Department of Biotechnology Dong-A University Busan 604-714 South Korea. Brain Korea 21 Center for Silver-Bio Industrialization Dong-A University Busan 604-714 South Korea

A strain WL-11 with high laccase activity was isolated from activated sludge collected from the effluent treatment plant of a textile and dyeing industry. It was identified as Aeromonas hydrophila by physiological test and 16S rDNA sequence analysis. A gene encoding of laccase from a newly isolated Aeromonas hydrophila WL-11 was cloned and characterized. Nucleotide sequence analysis showed an open reading frame of 1605 bp encoding a polypeptide comprised of 534 amino acids. The primary structure of the enzyme predicted the structural features characteristic of other laccases, including the conserved regions of four histidine-rich copper-binding sites. The predicted amino acid sequence showed a high homology （more than 60%） with bacterial laccases in the genome and protein databases and the highest degree of similarity （61% identity） was observed with the multicopper oxidase of KlebsieUa sp. 601. When expressed in Escherichia coli, the recombinant enzyme was overproduced in the cytoplasm as soluble and active form. The purified enzyme had an optimum pH of 2.6 and 8.0 for ABTS （2,2＇-azino-bis（3-ethylbenzthiazolinesulfonic acid） and DMP （2,6-dimethoxyphenol）, respectively. The kinetic study on ABTS revealed a higher affinity of this enzyme to this substrate than DMP.

关键词： cloning expression enzymatic properties laccase Aeromonas hydrophila

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