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Chinese Optics Letters 2014年第10期12卷 100-103页

作者： Jin Wook Kim Nam Ho Kim Ju-Anyoon seung il yoo Jin Sung Kang Woo Young Kim Department of Green Energy & Semiconductor Engineering Hoseo University Department of Engineering Physics McMaster University

We fabricate white phosphorescent organic light-emitting diodes （PHOLEDs） with three dopants and double emissive layer （EML） to achieve color stability. The white PHOLEDs use FIrpic dopant for blue EML （B- EML）, and Ir（ppy）3：Ir（piq）3 dopants for green：red EML （GR-EML） with N,N＇-dicarbazolyl-3, 5-benzene （mCP） as host material. Thicknesses of B-EML and GR-EML are adjusted to form a narrow recombination zone at two EML＇s interface and charge trapping happens in EML according to wide highest occupied molecular orbital and/or lowest unoccupied molecular orbital energy band gap of mCP and smaller energy band gap of dopants. The total thickness of both EMLs is fixed at 30 nm in the device structure of ITO （150 nm）/MoO3 （2 nm）/N,N＇-diphenyl-N,N＇-bis（1-naphthyl-phenyl）-（1,1″-biphenyl）-4, 4＇-diamine （70 nm）/ meP：Firpic-8.0% （12 nm）/mCP：Ir（ppy）3-3.0%：Ir（piq）3-1.5% （18 nm）/2″,2＇,2＂＇-（1,3,5-benzinetriyl）-tris（1- phenyl-l-H-benzimidazole）（30 nm）/8-hydroxyquinolinolato-lithium （2 nm）/A1 （120 nm）. White PHOLED shows 18.25 cd/A of luminous efficiency and white color coordinates of （0.358 and 0.378） at 5000 cd/m2 and color stability with slight CIExy change of （0.028 and 0.002） as increasing luminance from 1000 to 5000 cd/m^2.

关键词： EML White phosphorescent organic light-emitting diodes using double emissive layer with three dopants for color stability ITO nm NPB

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Highly efficient blue organic light-emitting diodes using various hole and electron confinement layers

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Chinese Optics Letters 2015年第3期13卷 72-75页

作者： Jin Sung Kang Ju-An yoon seung il yoo Jin Wook Kim Bo Mi Lee Hyeong Hwa Yu C.-B.Moon Woo Young Kim Department of Green Energy and Semiconductor Engineering Hoseo University Department of Engineering Physics Mc Master University

In this Letter, blue phosphorescence organic light-emitting diodes （PHOLEDs） employ structures for electron and/or hole confinement; 1,3,5-tris（N-phenylbenzimiazole-2-yl）benzene is used as a hole confinement layer and tris-（phenylpyrazole）iridium [Ir（ppz）3] is utilized for an electron confinement layer （ECL）. The electrical and optical properties of the fabricated blue PHOLEDs with various carrier-confinement structures are analyzed. Structures with a large ehergy offset between the carrier confinement and emitting layers enhance the charge-carrier balance in the emitting region, resulting from the effective carrier confinement. The maximum external quantum efficiency of the blue PHOLEDs with the double-ECLs is 24.02% at 1500 cd/m^2 and its luminous efficiency is 43.76 cd/A, which is 70.47% improved compared to the device without a carrier-confinement layer.

关键词： blue Highly efficient blue organic light-emitting diodes using various hole and electron confinement layers OLEDs EML ECL

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Whole-genome,transcriptome,and methylome analyses provide insights into the evolution of platycoside biosynthesis in Platycodon grandiflorus,a medicinal plant

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Horticulture Research 2020年第1期7卷 1536-1547页

作者： Jungeun Kim Sang-Ho Kang Sin-Gi Park Tae-Jin Yang Yi Lee Ok Tae Kim Oksung Chung Jungho Lee Jae-Pil Choi Soo-Jin Kwon Keunpyo Lee Byoung-Ohg Ahn Dong Jin Lee seung-il yoo In-Gang Shin Yurry Um Dae Young Lee Geum-Soog Kim Chang Pyo Hong Jong Bhak Chang-Kug Kim Personal Genomics Institute Genome Research FoundationOsong 28160Korea Genomics Division National Institute of Agricultural Sciences(NAS)Jeonju 54874Korea Theragen Etex Bio Institute Suwon 16229Korea Department of Plant Science Plant Genomics and Breeding Instituteand Research Institute of Agriculture and Life SciencesCollege of Agriculture and Life SciencesSeoul National UniversitySeoul 08826Korea Department of Industrial Plant Science&Technology Chungbuk National UniversityCheongju 28644Korea Department of Herbal Crop Research National Institute of Horticultural and Herbal ScienceRural Development Administration(RDA)Eumseong 27709Korea Clinomics Inc Ulsan 44919Korea Green Plant Institute Yongin 16954Korea Korean Genomics Center(KOGIC) Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea Department of Biomedical Engineering School of Life SciencesUlsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea

Triterpenoid saponins(TSs)are common plant defense phytochemicals with potential pharmaceutical properties.Platycodon grandiflorus(Campanulaceae)has been traditionally used to treat bronchitis and asthma in East Asia.The oleanane-type TSs,platycosides,are a major component of the P.grandiflorus root extract.Recent studies show that platycosides exhibit anti-inflammatory,antiobesity,anticancer,antiviral,and antiallergy properties.However,the evolutionary history of platycoside biosynthesis genes remains unknown.In this study,we sequenced the genome of P.grandiflorus and investigated the genes involved in platycoside biosynthesis.The draft genome of P.grandiflorus is 680.1 Mb long and contains 40,017 protein-coding genes.Genomic analysis revealed that the CYP716 family genes play a major role in platycoside oxidation.The CYP716 gene family of P.grandiflorus was much larger than that of other Asterid species.Orthologous gene annotation also revealed the expansion ofβ-amyrin synthases(bASs)in P.grandiflorus,which was confirmed by tissue-specific gene expression.In these expanded gene families,we identified key genes showing preferential expression in roots and association with platycoside biosynthesis.In addition,wholegenome bisulfite sequencing showed that CYP716 and bAS genes are hypomethylated in P.grandiflorus,suggesting that epigenetic modification of these two gene families affects platycoside biosynthesis.Thus whole-genome,transcriptome,and methylome data of P.grandiflorus provide novel insights into the regulation of platycoside biosynthesis by CYP716 and bAS gene families.

关键词： properties insight roots

Machine-learned wearable sensors for real-time hand-motion recognition: toward practical applications

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National Science Review 2024年第2期11卷 231-263页

作者： Kyung Rok Pyun Kangkyu Kwon Myung Jin yoo Kyun Kyu Kim Dohyeon Gong Woon-Hong Yeo seungyong Han seung Hwan Ko Department of Mechanical Engineering Seoul National University IEN Center for Human-Centric Interfaces and Engineering Institute for Electronics and NanotechnologyGeorgia Institute of Technology School of Electrical and Computer Engineering Georgia Institute of Technology Department of Chemical Engineering Stanford University Department of Mechanical Engineering Ajou University George W.Woodruff School of Mechanical Engineering Georgia Institute of Technology Institute of Advanced Machinery and Design(SNU-IAMD) Seoul National University

Soft electromechanical sensors have led to a new paradigm of electronic devices for novel motion-based wearable applications in our daily lives. However, the vast amount of random and unidentified signals generated by complex body motions has hindered the precise recognition and practical application of this technology. Recent advancements in artificial-intelligence technology have enabled significant strides in extracting features from massive and intricate data sets, thereby presenting a breakthrough in utilizing wearable sensors for practical applications. Beyond traditional machine-learning techniques for classifying simple gestures, advanced machine-learning algorithms have been developed to handle more complex and nuanced motion-based tasks with restricted training data sets. Machine-learning techniques have improved the ability to perceive, and thus machine-learned wearable soft sensors have enabled accurate and rapid human-gesture recognition, providing real-time feedback to users. This forms a crucial component of future wearable electronics, contributing to a robust human–machine interface. In this review, we provide a comprehensive summary covering materials, structures and machine-learning algorithms for hand-gesture recognition and possible practical applications through machine-learned wearable electromechanical sensors.

关键词： wearable sensor soft electronics artificial intelligence machine learning human–machine interfaces gesture recognition

Extracorporeal membrane oxygenation for lung cancer-related life-threatening hypoxia:A case report

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World Journal of Clinical Cases 2022年第25期10卷 8974-8979页

作者： seung Soo yoo Shin Yup Lee Sun Ha Choi Department of Internal Medicine Kyungpook National UniversityDaegu 41404South Korea Lung Cancer Center Kyungpook National University Chilgok HospitalDaegu 41404South Korea

BACKGROUND Life-threatening hypoxia can occur in patients with lung cancer due to bronchial obstruction.Extracorporeal membrane oxygenation(ECMO)can be used as a bridge therapy for patients with severe hypoxia not relieved by conventional mechanical treatment.However,the usefulness of chemotherapy in patients with lung cancer receiving ECMO therapy is not well known.CASE SUMMARY A 53-year-old man visited the emergency room with worsening dyspnea for 1 mo.A series of imaging and diagnostic tests were performed,and stageⅢB(cT4N2M0)lung cancer was eventually diagnosed.On hospital day 3,he experienced dyspnea and hypoxia that was not relieved with oxygen support via a high-flow nasal cannula.ECMO was initiated because his respiratory condition did not improve even with mechanical ventilation.The patient then underwent gemcitabine/cisplatin chemotherapy without dose reduction while on ECMO.After two cycles of chemotherapy,there was a decrease in the size of the primary tumor in the right main bronchus.After the completion of concurrent chemoradiotherapy,a computed tomography scan revealed further improvement in the right main bronchus narrowing.Eight months after a lung cancer diagnosis,the patient did well without any dyspnea.CONCLUSION ECMO is a potential bridge therapy for respiratory failure in patients with central airway obstruction secondary to lung cancer.

关键词： Extracorporeal membrane oxygen Lung cancer Hypoxia Respiratory failure Chemoradiotherapy Case report

Characterization of focal hypermetabolic thyroid incidentaloma: An analysis with F-18 fluorodeoxyglucose positron emission tomography/computed tomography parameters

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World Journal of Clinical Cases 2022年第1期10卷 155-165页

作者： Haejun Lee yoo seung Chung Joon-Hyop Lee Ki-Young Lee Kyung-Hoon Hwang Department of Nuclear Medicine Gachon University College of MedicineGil Medical CenterIncheon 21565South Korea Department of Endocrine Surgery Gachon University College of MedicineGil Medical CenterIncheon 21565South Korea Department of Endocrinology and Metabolism Gachon University College of MedicineGil Medical CenterIncheon 21565South Korea

BACKGROUND Incidentally found thyroid tumor(thyroid incidentaloma,TI)on F-18 fluorodeoxyglucose(FDG)positron emission tomography-computed tomography(PETCT)is reported in 2.5%-5%of patients being investigated for non-thyroid purposes.Up to 50%of these cases have been diagnosed to be malignant by cytological/histological results.Ultrasonography(US)and fine-needle aspiration cytology are recommended for thyroid nodules with high FDG uptake(hypermetabolism)that are 1 cm or greater in size.It is important to accurately determine whether a suspicious hypermetabolic TI is malignant or benign.AIM To distinguish malignant hypermetabolic TIs from benign disease by analyzing F-18 FDG PET-CT parameters and to identify a cut-off value.METHODS Totally,12761 images of patients who underwent F-18 FDG PET-CT for nonthyroid purposes at our hospital between January 2016 and December 2020 were retrospectively reviewed,and 339 patients[185 men(mean age:68±11.2)and 154 women(mean age:63±15.0)]were found to have abnormal,either focal or diffuse,thyroid FDG uptake.After a thorough review of their medical records,US,and cytological/histological reports,46 eligible patients with focal hypermetabolic TI were included in this study.The TIs were categorized as malignant and benign according to the cytological/histological reports,and four PET parameters[standardized uptake value(SUV)max,SUV_(peak),SUV_(mean),and metabolic tumor volume(MTV)]were measured on FDG PET-CT.Total lesion glycolysis(TLG)was calculated by multiplying the SUV_(mean) by MTV.Both parametric and non-parametric methods were used to compare the five parameters between malignant and benign lesions.Receiver operating characteristic(ROC)curve analysis was performed to identify a cut-off value.RESULTS Each of the 46 patients[12 men(26.1%;mean age:62±13.1 years)and 34 women(73.9%;mean age:60±12.0 years)]with focal hypermetabolic TIs had one focal hypermetabolic TI.Among them,26(56.5%)were malignant and 20(43.5%)were benign.SUV_(max),SUV_(peak),SUV_(mean),and TLG were all higher

关键词： Thyroid incidentaloma Malignancy Fluorodeoxyglucose positron emission tomography/computed tomography Standardized uptake value Cut-off

Stick-and-play system based on interfacial adhesion control enhanced by micro/nanostructures

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Nano Research 2021年第9期14卷 3143-3158页

作者： Jung II yoo seung Hyun Kim Heung Cho Ko School of Materials Science and Engineering Gwangju Institute of Science and Technology(GIST)Gwangju 61005Republic of Korea

The evolution of membrane-type electronics has facilitated the development of stick-and-play systems,which confer diverse electrical functions to various planar or arbitrary curvilinear surfaces.The stick-and-play concept is based on the development of thin electronic devices in a printable format and their subsequent transfer to target surfaces.The development of this technology requires control of the interfacial adhesion of the electronic prints for retrieval from a carrier and transfer to the target surface.First,we discuss the transfer printing for membrane-type electronics,starting from an overview of materials available for flexible substrates,transfer printing of electronic prints for retrieval,and assembly for further integration.Second,we explain the stick-and-play concept based on fabricated membrane-type electronics;"stick" and “play"refer to the transfer of electronic devices and the performance of their electronic functions,respectively.In particular,we broadly survey various methods based on micro/nanostructures,including gecko-inspired,interlocking,cephalopod-sucker-inspired,and cilia structures,which can be employed to stick-and-play systems for enhancing interfacial adhesion with complex target surfaces under dynamic and wet conditions.Finally,we highlight the stick-and-play system application of micro/nanostructures for skin-attachable biomedical electronics,e-textiles,and environmental monitoring electronics.

关键词： transfer printing interfacial adhesion flexible electronics stick-and-play system bioinspired adhesive

Optic perineuritis as an initial presentation of ocular toxoplasmosis:a case report

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International Journal of Ophthalmology(English edition) 2022年第12期15卷 2043-2046页

作者： seung Ah Chung Chungwoon Kim Jong yoon Lim yoo-Ri Chung Department of Ophthalmology Ajou University School of MedicineSuwon 16499Republic of Korea The Bright Eye Center Gwangmyeong 14235Republic of Korea

Dear Editor,Ocular toxoplasmosis,caused by Toxoplasma gondii infection,is one of the most common causes of posterior uveitis worldwide[1].It typically manifests as white focal retinitis with overlying vitreous inflammation that results in a chorioretinal scar and associated scotoma[2].However,the diagnosis of ocular toxoplasmosis can be challenging when it presents as an isolated papillitis without other typical signs of retinochoroiditis or vitritis[2].Although optic nerve involvement in ocular toxoplasmosis was present in 5.3%of cases,isolated papillitis was extremely rare(3 eyes out of 926 patients)and was only considered a presumed diagnosis in such cases given the presence of old toxoplasmic retinochoroiditis lesions[3].Few reports have described optic nerve involvement preceding toxoplasmic retinochoroiditis,while perineuritis,an uncommon form of orbital inflammatory disease involving the optic nerve sheath,has not been reported at all[4-5].Herein,we describe a case of ocular toxoplasmosis that initially presented with optic perineuritis followed by typical retinochoroidal inflammation.To our knowledge,this is the first case report of ocular toxoplasmosis with perineuritis in an immunocompetent individual.

关键词： ocular diagnosis neuritis

Mismatching between nest volume and clutch volume reduces egg survival and fledgling success in black-tailed gulls

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Current Zoology 2016年第5期62卷 451-456页

作者： Who-seung LEE Jeong-Chil yoo Korea Institute of Ornithology and Department of Biology Kyung Hee University Seoul 02447 Korea Center for Stock Assessment Research University of California Santa Cruz Santa Cruz CA 95080 USA

A longstanding suggestion posits that parents prefer to match nest volume and clutch size (clutch volume), but few studies have tested this in colonial seabirds that nest in the open. Here, we demonstrate the effects of nest-clutch volume matching on egg survival, hatching, and fledgling success in black-tailed gulls on Hongdo Island, Korea. We show that the volume mismatch, defined as the difference between nest volume and total egg volume (the sum of all eggs' volume in the clutch), was positively related to egg and chick mortality caused by predation, but was not significantly related to hatching success incurred by insulation during the incubation period. Although nest volume was negatively related to laying date, we found that the mismatch was positively related to laying date. Our results support the claim that well-matched nest-clutch volume may contribute to survival of eggs and chicks, and ultimately breeding success.

关键词： black-tailed gulls clutch size egg survival fledgling success nest volume

Diffusionless-Like Transformation Unlocks Pseudocapacitance with Bulk Utilization: Reinventing Fe_(2)O_(3) in Alkaline Electrolyte

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Energy & Environmental Materials 2023年第1期6卷 145-154页

作者： Taowen Dong Wencai Yi Ting Deng Tingting Qin Xianyu Chu He Yang Lirong Zheng seung Jo yoo Jin-Gyu Kim Zizhun Wang Yan Wang Wei Zhang Weitao Zheng State Key Laboratory of Automotive Simulation and Control and School of Materials Science&EngineeringKey Laboratory of Automobile Materials MOEand Electron Microscopy Centerand International Center of Future ScienceJilin UniversityChangchun 130012China Laboratory of High Pressure Physics and Material Science(HPPMS) School of Physics and Physical EngineeringQufu Normal UniversityQufu 273165China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Electron Microscopy Research Center Korea Basic Science InstituteDaejeon 34133South Korea Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China IKERBASQUE Basque Foundation for ScienceBilbao 48013Spain

Energy density can be substantially raised and even maximized if the bulk of an electrode material is fully utilized.Transition metal oxides based on conversion reaction mechanism are the imperative choice due to either constructing nanostructure or intercalation pseudocapacitance with their intrinsic limitations.However,the fully bulk utilization of transition metal oxides is hindered by the poor understanding of atomic-level conversion reaction mechanism,particularly it is largely missing at clarifying how the phase transformation(conversion reaction)determines the electrochemical performance such as power density and cyclic stability.Herein,α-Fe_(2)O_(3) is a case provided to claim how the diffusional and diffusionless transformation determine the electrochemical behaviors,as of its conversion reaction mechanism with fully bulk utilization in alkaline electrolyte.Specifically,the discharge productα-FeOOH diffusional from Fe(OH)2 is structurally identified as the atomic-level arch criminal for its cyclic stability deterioration,whereas the counterpartδ-FeOOH is theoretically diffusionless-like,unlocking the full potential of the pseudocapacitance with fully bulk utilization.Thus,such pseudocapacitance,in proof-of-concept and termed as conversion pseudocapacitance,is achieved via diffusionless-like transformation.This work not only provides an atomic-level perspective to reassess the potential electrochemical performance of the transition metal oxides electrode materials based on conversion reaction mechanism but also debuts a new paradigm for pseudocapacitance.

关键词： bulk utilization,conversion pseudocapacitance diffusionless transformation Fe_(2)O_(3) phase transformation

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