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Curved copper nanowires-based robust flexible transparent electrodes via all-solution approach

Nano Research 2017年第9期10卷 3077-3091页

作者： Zhenxing Yin seung Keun Song Sanghun Cho Duck-Jae You Jeeyoung yoo Suk Tai Chang Youn Sang Kim Program in Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University Seoul 08826 Republic of Korea School of Chemical Engineering and Materials Science Chung-Ang University Seou106974 Republic of Korea Advanced Institutes of Convergence Technology 145 Gwanggyo-ro Yeongtong-gu Suwon-si Gyeonggi-do 16229 Republic of Korea

Curved Cu nanowire (CCN)-based high-performance flexible transparent conductive electrodes (FTCEs) were fabricated via a fully solution-processed approach, involving synthesis, coating, patterning, welding, and transfer. Each step involved an innovative technique for completing the all-solution processes. The high-quality and well-dispersed CCNs were synthesized using a multi-polyol method through the synergistic effect of specific polyol reduction. To precisely control the optoelectrical properties of the FTCEs, the CCNs were uniformly coated on a polyimide (PI) substrate via a simple meniscus-dragging deposition method by tuning several coating parameters. We also employed a polyurethane (PU)-stamped patterning method to effectively produce 20 μm patterns on CCN thin films. The CCN thin films exhibited high electrical performance, which is attributed to the deeply percolated CCN network formed via a solvent-dipped welding method. Finally, the CCN thin films on the PI substrate were partially embedded and transferred to the PU matrix to reduce their surface roughness. Through consecutive processes involving the proposed methods, a highly percolated CCN thin film on the PU matrix exhibited high optoelectrical performance (R s = 53.48 Ω/□ at T = 85.71%), excellent mechanical properties (R/R 0 < 1.10 after the 10th repetition of tape peeling or 1,000 bending cycles), and a low root-mean-square surface roughness (R rms = 14.36 nm).

关键词： curved Cu nanowires all-solution processes 20 μm patterns high performance transparent electrode

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White phosphorescent organic light-emitting diodes using double emissive layer with three dopants for color stability

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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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Insights into the pathogenesis of cystoid macular edema: leukostasis and related cytokines

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International Journal of Ophthalmology(English edition) 2019年第7期12卷 1202-1208页

作者： yoo-Ri Chung Young Ho Kim seung Yeop Lee Hye-Eun Byeon Kihwang Lee Department of Ophthalmology Ajou University School of Medicine Suwon 16499 Korea Institute of Medical Science Ajou University School of Medicine Suwon 16499 Korea

Cystoid macular edema(CME) is the abnormal collection of intraretinal fluid in the macular region, especially in the inner nuclear and outer plexiform layers. CME leads to severe visual impairment in patients with various retinal diseases, such as diabetic retinopathy, retinal vascular occlusion, choroidal neovascularization, and uveitis. Although various retinal conditions lead to CME, a shared pathogenesis of CME is involved in these diseases. Accordingly, the pathogenesis of CME based on vasogenic mechanisms is first discussed in this review, including vascular hyperpermeability, leukostasis, and inflammation. We then describe cytotoxic mechanisms based on retinal Müller cell dysfunction. This comprehensive review will provide an understanding of the pathogenesis of CME for potential therapeutic strategies.

关键词： cystoid macular edema cytokine leukostasis pathogenesis

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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 *** to 50%of these cases have been diagnosed to be malignant by cytological/histological ***(US)and fine-needle aspiration cytology are recommended for thyroid nodules with high FDG uptake(hypermetabolism)that are 1 cm or greater in *** is important to accurately determine whether a suspicious hypermetabolic TI is malignant or *** To distinguish malignant hypermetabolic TIs from benign disease by analyzing F-18 FDG PET-CT parameters and to identify a cut-off *** 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 *** a thorough review of their medical records,US,and cytological/histological reports,46 eligible patients with focal hypermetabolic TI were included in this *** 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 *** lesion glycolysis(TLG)was calculated by multiplying the SUV_(mean) by *** parametric and non-parametric methods were used to compare the five parameters between malignant and benign *** operating characteristic(ROC)curve analysis was performed to identify a cut-off *** 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 *** them,26(56.5%)were malignant and 20(43.5%)were ***_(max

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

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Effects of obesity on lower urinary tract symptoms in Korean BPH patients

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Asian Journal of Andrology 2009年第6期11卷 663-668页

作者： seung hwan Lee Joon Chul Kim Ji-Youl Lee Jang hwan Kim Cheol Young Oh seung Wook Lee Se Jeong yoo Byung Ha Chung Department of Urology Yonsei University Health System Seoul 135-720 Korea Department of Urology The Catholic University of Korea Seoul 137-701 Korea Department of Urology Hallym University Chuncheon 200-704 Korea Department of Urology Eulji Medical Center Eulji University Seoul 139-230 Korea

We analyzed the effects of obesity on lower urinary tract symptoms （LUTSs） in Korean benign prostatic hyperplasia （BPH） patients. This is a multicenter, cross-sectional, prospective study conducted in four centers in Korea. A total of 602 men with LUTSs secondary to BPH were included. BPH/LUTSs cases were men aged ≥ 40 years with intemational prostate symptom scores （IPSS） ≥ 8 points. Height, weight and waist circumference were measured. Among the 602 patients, 156 patients had a waist circumference above 90 cm, representing central obesity, and 215 patients had a body mass index above 25 kg m2. Waist circumference was positively correlated with prostate volume （P = 0.034）. Men with waist circumference 〉 90 cm experienced a 1.36-fold increased risk of severe LUTSs （95% CI 0.82-2.41） compared with men with waist circumference ≤ 90 cm. Prostate volume was positively correlated with urgency and nocturia in men with central obesity. In this population of Korean men diagnosed with BPH, central obesity rather than overall obesity seems to be the more important predictor of LUTSs correlated with BPH.

关键词： benign prostatic hyperplasia central obesity lower urinary tract symptom prostate

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Efficiency enhancement of fluorescent blue organic light-emitting diodes using doped hole transport and emissive layers

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Chinese Optics Letters 2016年第4期14卷 86-90页

作者： Nam Ho Kim You-Hyun Kim Ju-An yoon seung Ⅱ yoo Kok Wai Cheah Furong Zhu Woo Young Kim Department of Green Energy & Semiconductor Engineering Hoseo University 513-3 2nd Engineering Building 20 Hoeo-ro beon-gil baebang-eup Asan-si Chungcheongnam-do 31499 South Korea Department of Engineering Physics McMaster University 1280 Main St W Hamilton L8S 4L8 Canada Department of Physics Hong Kong Baptist University Hong Kong Kowloon Tong Waterloo Road 224 China

The electroluminescent characteristics of blue organic light-emitting diodes （BOLEDs） fabricated with doped charge carrier transport layers are analyzed. The fluorescent blue dopant BCzVBi is doped in an emissive layer, hole transport layer （HTL） and electron transport layer （ETL）, respectively, to optimize the probability of ex- citon generation in the BOLEDs. The luminance and luminous efficiency of BOLEDs made with BCzVBi-doped HTL and ETL increase by 22% and 17% from 11,683 cd/m2 at 8.5 V and 6.08 cd/A at 4.0 V to 14,264 cd/m2 at 8.5 V and 7.13 cd/A at 4.0 V while CIE coordinates of （0.15, 0.15） of both types of BOLEDs remained unchanged. The electron mobility of BCzVBi is estimated to be 1.02 × 10-5 cm2/Vs by TOF.

关键词： Carrier transport Doping (additives) Efficiency Electron transport properties Fluorescence Hole mobility Light emission Light emitting diodes

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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 *** our knowledge,this is the first case report of ocular toxoplasmosis with perineuritis in an immunocompetent individual.

关键词： ocular diagnosis neuritis

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Evaluation of defects in aluminum piston castings by using ultrasonics and computer tomography

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China Foundry 2012年第3期9卷 275-278页

作者： In-Sung Cho Jeong-Ho hwang Jin-Seok Yang seung-Mok yoo Chae-Ho Lim Korea Institute of Industrial Technology

Pistons used in automobile engines are made of aluminum alloy; and endurance of high pressure and high temperature is required. Recently, high strength pistons are needed to cope with the increase of pressure and temperature in the engine cylinder. A high strength piston is possible when the piston casting has little or no casting defects, such as micro-pores and cracks. Generally the defects can be evaluated by non-destructive testing (NDT), and the most efficient ways for evaluation are using ultrasonics and computer tomography. In the present study, two NDT methods were compared and evaluated to investigate the defects in the aluminum piston castings. Artificial defects were machined by using very small drill bits with diameters 1, 0.5, 0.3, 0.2 and 0.1 mm. The defects were investigated by using an ultrasonic tester and a computer tomography system. Defects smaller than 0.3 mm may not be found by using the ultrasonic test, but the defects may be found by using the computer tomography system. The investigation conditions for detecting small defects and the scanning time for in-line defect analysis are discussed in the present study.

关键词： piston ultrasonic test computer tomography aluminum defect

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Thioredoxin and thioredoxin-interacting protein as prognostic markers for gastric cancer recurrence

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World Journal of Gastroenterology 2012年第39期18卷 5581-5588页

作者： Jae Yun Lim Sun Och yoo Soon Won Hong Jong Won Kim seung Ho Choi Jae Yong Cho Department of Medical Oncology Gangnam Severance Cancer HospitalYonsei University College of MedicineSeoul 135-720South Korea Department of Pathology Gangnam Severance Cancer HospitalYonsei University College of MedicineSeoul 135-720South Korea Department of Surgery Gangnam Severance Cancer HospitalYonsei University College of MedicineSeoul 135-720South Korea

AIM:To evaluate the potential of thioredoxin (TXN) and thioredoxin-interacting protein (TXNIP) expression as biomarkers for predicting gastric cancer recurrence. METHODS:TXN and TXNIP expression levels were acquired from gene expression microarray data for 65 human gastric cancer tissues. We determined whether each gene expression level was associated with cancer recurrence and investigated the relationship between the two genes. For validation, the expression levels of TXN and TXNIP were measured by quantitative real- time reverse transcription polymerase chain reaction in 68 independent stage Ⅲ gastric cancer patients. The correlation between gene expression and cancer prognosis was evaluated. Immunohistochemical staining was performed to investigate the protein expression levels of TXN and TXNIP and to characterize the expression patterns of each protein. RESULTS:TXN was a prognosis-related gene (P = 0.009), whereas TXNIP, a TXN inhibitor, demonstrated a negative correlation with TXN in the gene expression microarray data. In the 68 stage Ⅲ patients, the expression levels of both TXN and TXNIP had a statistically significant effect on recurrence-free survival (RFS, P = 0.008 and P = 0.036, respectively). The low TXN and high TXNIP expression group exhibited a better prognosis than the other groups, and the high TXN and low TXNIP expression group exhibited a poorer prognosis (P < 0.001 for RFS and P = 0.001 for overall survival). More than half of the patients in the simulta-neously high TXN and low TXNIP expression group ex- perienced a recurrence within 1 year after curative surgery, and the 5-year survival rate of the patients in this group was 29%, compared with 89% in the low TXN and high TXNIP expression group. The TXN protein was overexpressed in 65% of the gastric cancer tissues, whereas the TXNIP protein was underexpressed in 85% of the cancer cells. In a correlation analysis, TXN and TXNIP were highly correlated with many oncogenes and tumor suppressors

关键词： Gastric cancer Thioredoxin Thioredoxin-interacting protein Biomarker Prognosis

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Generation of dynamically perfused functional vascular network system within hydrogel using3D bio-printing technology

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医用生物力学 2013年第S1期28卷 9-11页

作者： Vivian K.Lee seung-Schik yoo Peter Vincent Guohao Dai Department of Biomedical Engineering Rensselaer Polytechnic Institute Department of Radiology Brigham and Women's HospitalHarvard Medical School Center for Cardiovascular Sciences Albany Medical College

Introduction:3D bio-printing technology[1-3]（Figure 1）capable of dispensing live cells,soluble factors,and phase-changing hydrogel in a desired pattern,has great potential in creating 3D ***,maintaining the viability of a thick tissue structure during tissue growth and maturation is challenging due to lack of adequate vascular *** a simple tissue model with

关键词： hydrogel printing perfusion dynamically challenging viability maintaining desired thick capable

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