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Investigation into charge carrier dynamics in organic light-emitting diodes

Nano Research Energy 2024年第2期3卷 39-46页

作者： Dong-Guang Zheng Hyeon-Dong Lee Gyeong Won Lee Dong-Soo Shin Jeongwon kim Jong-In Shim Zhiqun Lin Tae-woo Lee Dong Ha kim Information Engineering College Hangzhou Dianzi UniversityHangzhou 311305China Department of Materials Science and Engineering Seoul National University1 Gwanak-roGwanak-guSeoul 08826Republic of Korea Department of Photonics and Nanoelectronics Hanyang University ERICA55 Hanyangdeahak-roSangnok-guAnsanGyeonggi 15588Republic of Korea Department of Chemistry and Nanoscience Ewha Womans University52Ewhayeodae-gilSeodaemun-guSeoul 03760Republic of Korea Department of Chemical and Biomolecular Engineering National University of Singapore4 Engineering Drive 4Singapore 117585Singapore School of Chemical and Biological Engineering Institute of Engineering ResearchResearch Institute of Advanced MaterialsSoft FoundrySeoul National University1 Gwanak-roGwanak-guSeoul 08826Republic of Korea Basic Sciences Research Institute(Priority Research Institute) Ewha Womans UniversitySeoul 03760Republic of Korea Nanobio∙Energy Materials Center(National Research Facilities and Equipment Center) Ewha Womans UniversitySeoul 03760Republic of Korea

Organic light-emitting diodes(OLEDs)have demonstrated remarkable advancements in both device lifetime and luminous ***,insufficient operation lifetime due to device degradation remains a major hurdle,especially for brighter *** the degradation mechanisms of OLEDs due to the degradation of functional materials and the formation of defects in device architectures continues to be a significant ***,we evaluate the degradation characteristics by scrutinizing the electrical and optical properties,as well as analyzing the charge carrier dynamics in pristine and aged states of phosphorescent OLEDs(PhOLEDs).We show that degradation mechanisms in PhOLEDs can be elucidated in terms of the ideality factors of current and luminance in pristine and aged device *** consistent shifts in distinct ideality factors across various states points out that the device degradation is attributed to the deterioration of the guest material,***-light-emitting phosphorescent ***,the incongruity in ideality factor changes between the two states indicates that the degradation results from the deterioration of non-light-emitting *** characterization experiments provide further evidence that this degradation is primarily attributed to the deterioration of CBP-host *** thorough understanding of degradation mechanisms established in this study can contribute to realizing the highly reliable PhOLEDs with a long lifetime.

关键词： organic light-emitting diodes ideality factor carrier transport processes degradation mechanism

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Crushed Gold Shell Nanoparticles Labeled with Radioactive Iodine as a Theranostic Nanoplatform for Macrophage-Mediated Photothermal Therapy

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Nano-Micro Letters 2019年第2期11卷 244-257页

作者： sang Bong Lee Jae-Eon Lee Sung Jin Cho Jungwook Chin sang Kyoon kim In-Kyu Lee sang-woo Lee Jaetae Lee Yong Hyun Jeon New Drug Development Center Daegu-Gyeongbuk Medical Innovation FoundationDaeguSouth Korea Department of Biomaterials Science College of Natural Resources and Life Science/Life and Industry Convergence Research InstitutePusan National UniversityPusanSouth Korea Leading-Edge Research Center for Drug Discovery and Development for Diabetes and Metabolic Disease Kyungpook National University HospitalDaegu 702-210South Korea Department of Nuclear Medicine Kyungpook National University HospitalDaegu 702-210South Korea Department of Internal Medicine Kyungpook National University School of MedicineDaegu 700-721South Korea Daegu-Gyeongbuk Medical Innovation Foundation Daegu 360-4South Korea [Laboratory Animal Center Daegu-Gyeongbuk Medical Innovation FoundationDaegu 360-4South Korea

Plasmonic nanostructure-mediated photothermal therapy(PTT) has proven to be a promising approach for cancer treatment,and new approaches for its effective delivery to tumor lesions are currently being *** study aimed to assess macrophage-mediated delivery of PTT using radioiodine-124-labeled gold nanoparticles with crushed gold shells(124I-Au@AuCBs) as a theranostic nanoplatform.124I-Au@AuCBs exhibited effective photothermal conversion effects both in vitro and in vivo and were efficiently taken up by macrophages without *** the administration of 124I-Au@AuCB-labeled macrophages to colon tumors,intensive signals were observed at tumor lesions,and subsequent in vivo PTT with laser irradiation yielded potent antitumor *** results indicate the considerable potential of 124I-Au@AuCBs as novel theranostic nanomaterials and the prominent advantages of macrophage-mediated cellular therapies in treating cancer and other diseases.

关键词： Photothermal therapy Radionuclide crushed gold shell nanoballs Macrophage-mediated delivery

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Recommendation application for video head impulse test based on fuzzy logic control

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Journal of Central South University 2016年第5期23卷 1208-1214页

作者： NGUYEN Thi Anh Dao kim Dae Young LEE sang Min kim Kyu Sung Seong Ro Lee KWON Jang woo Department of Computer and Information Engineering Inha University Department of Otorhinolaryngology Inha University Hospital Department of Electronic Engineering Inha University Department of Information and Electronics Engineering Mokpo National University

Vestibulo-ocular reflex(VOR) is an important biological reflex that controls eye movement to ensure clear vision while the head is in ***,VOR measurement is commonly done with a video head impulse test based on a velocity gain algorithm or a position gain algorithm,in which velocity gain is a VOR calculation on head and eye velocity,whereas position gain is calculated from head and eye *** aim of this work is first to compare the two algorithms' performance and to detect covert catch-up saccade,then to propose a stand-alone recommendation application for the patient's *** the first experiment,for ipsilesional and contralesional sides,the calculated position gain(0.94±0.17) is higher than velocity gain(0.84±0.19).Moreover,gain asymmetry of both lesion and intact sides using velocity gain is mostly higher than that from using position gain(four out of five subjects).Consequently,for subjects who have unilateral vestibular neuritis diagnosed from clinical symptoms and a vestibular function test,vestibular weakness is depicted by velocity gain much better than by position *** catch-up saccade and position gain then are used as inputs for recommendation applications.

关键词： vestibulo-ocular response video head impulse velocity gain position gain desaccade

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Liver abscess and sepsis with Bacillus pantothenticus in an immunocompetent patient:A first case report

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World Journal of Gastroenterology 2009年第42期15卷 5360-5363页

作者： Jung Sik Na Tae Hyung kim Heung Su kim sang Hyun Park Ho Sup Song sang woo Cha Hee Jung Yoon Department of Internal Medicine Eulji University College of MedicineDaejeon 302-799South Korea

Bacillus species are aerobic,gram-positive,spore forming rods that are usually found in the soil,dust,streams,and other environmental *** for ***(***) ,most species display low virulence,and only rarely cause infections in hosts with weak or damaged immune *** are two case reports of *** as a potentially serious bacterial pathogen causing a liver abscess in an immunologically competent *** herein report a case of liver abscess and sepsis caused by *** in an immunocompetent *** now,no case of liver abscess due to *** has been reported.

关键词： Bacillus pantothenticus, Bacillus species Immunocompetence Liver abscess and sepsis

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Surgical outcome of pancreatic cancer using radical antegrade modular pancreatosplenectomy procedure

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World Journal of Gastroenterology 2012年第39期18卷 5595-5600页

作者： Ye Rim Chang Sung-Sik Han sang-Jae Park Seung Duk Lee Tae Suk Yoo Young-Kyu kim Tae Hyun kim sang Myung woo woo Jin Lee Eun Kyung Hong Department of Surgery Seoul National University HospitalSeoul 110-744South Korea Center for Liver Cancer National Cancer CenterGyeonggido 411-764South Korea

AIM:To evaluate the surgical outcomes following radical antegrade modular pancreatosplenectomy (RAMPS) for pancreatic cancer. METHODS:Twenty-four patients underwent RAMPS with curative intent between January 2005 and June 2009 at the National Cancer Center, South Korea. Clinicopathologic data, including age, sex, operative findings, pathologic results, adjuvant therapy, postop-erative clinical course and follow-up data were retro-spectively collected and analyzed for this study. RESULTS:Twenty-one patients (87.5%) underwent distal pancreatectomy and 3 patients (12.5%) underwent total pancreatectomy using RAMPS. Nine patients (37.5%) underwent combined vessel resection, including 8 superior mesenteric-portal vein resections and 1 celiac axis resection. Two patients (8.3%) underwent combined resection of other organs, including the colon, stomach or duodenum. Negative tangential margins were achieved in 22 patients (91.7%). The mean tumor diameter for all patients was 4.09 ± 2.15 cm. The 2 patients with positive margins had a mean diameter of 7.25 cm. The mean number of retrieved lymph nodes was 20.92 ± 11.24 and the node positivity rate was 70.8%. The median survival of the 24 patients was 18.23 ± 6.02 mo. Patients with negative margins had a median survival of 21.80 ± 5.30 mo and those with positive margins had a median survival of 6.47 mo (P = 0.021). Nine patients (37.5%) had postoperative complications, but there were no postoperative mortalities. Pancreatic fistula occurred in 4 patients (16.7%):2 patients had a grade A fistula and 2 had a grade B fistula. On univariate analysis, histologic grade, positive tangential margin, pancreatic fistula and adjuvant therapy were significant prognostic factors for survival. CONCLUSION:RAMPS is a feasible procedure for achieving negative tangential margins in patients with carcinoma of the body and tail of the pancreas.

关键词： Carcinoma Pancreas Surgical resection Sur-vival Radical antegrade modular pancreatosplenectomy

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Highly efficient and stable solid-state fiber dye-sensitized solar cells with Ag-decorated SiO_(2) nanoparticles

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Nano Research 2021年第8期14卷 2728-2734页

作者： Jae Ho kim Seok-Ju Yoo Daseul Lee Jin woo Choi sang-Cheol Han Tae In Ryu Hyung woo Lee Myunghun Shin Myungkwan Song Materials Center for Energy Convergence Korea Institute of Materials Science(KIMS)797Changwon-daeroSungsan-guChangwonGyeongsangnam-do51508Republic of Korea CEN Nano.Co.Ltd. Nano Convergence CenterMuan-roBuduk-myeonMiryang-siGyeongsangnam-do50404Republic of Korea Accident Coordination and Training Division National Institute of Chemical Safety(NICS)90Gajeongbuk-roYuseong-guDaejeon34114Republic of Korea Department of Nanoenergy Engineering and Research Center of Energy Convergence Technology Pusan National UniversityBusandaehak-ro 63-2Geumjeong-guBusan 46241Republic of Korea School of Electronics and Information Engineering Korea Aerospace University Goyang-cityGyeonggi-do10540Republic of Korea

Fiber-shaped dye-sensitized solar cells(FDSSCs)represent promising futuristic flexible or wearable power sources,owing to their simple fabrication process,light weight,weavability,and *** with strategies on changing the properties of semiconductor materials,the effects of incorporating silver-embedded SiO_(2) nanoparticles(Ag@SiO_(2)NPs)on the photoanodes of solid-state FDSSCs(SS-FDSSCs)are *** power conversion efficiency(PCE)of SS-FDSSCs with Ag@SiO_(2) NPs reaches 5.38%,which is comparable to the reference(3.98%).The PCEs remain at 95%between-16.9 and 91.7℃,indicating the operational stability of SS-FDSSCs within this temperature *** fabricated SS-FDSSCs,whose radii were 2 mm,maintains more than 90%of their efficiency over 500 bending cycles and 10 washing cycles.

关键词： dye-sensitized solar cells fiber-shaped solar cells SiO_(2)nanoparticles plasmonic effect solid-state electrolyte

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Diverse Functions of VDUP1 in Cell Proliferation,Differentiation,and Diseases

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Cellular & Molecular Immunology 2007年第5期4卷 345-351页

作者： sang Yong kim Hyun-woo Suh Jin woong Chung Suk-Ran Yoon Inpyo Choi Stem Cell Research Center Korea Research Institute of Bioscience and BiotechnologyYusongTaejon 305-333Republic of Korea

Vitamin D3 up-regulated protein 1 （VDUP1） is a multifunctional protein involved in maintaining cellular homeostasis. VDUP1 is induced by a variety of stresses. Inversely, VDUP1 is often reduced in various tumor tissues and cell lines. Over-expression of VDUP1 inhibits cell proliferation through cell cycle arrest. VDUP1 interacts with thioredoxin （Trx） and negatively regulates the expression and antioxidant function of Trx which is involved in redox regulation. VDUP1/ mice are more susceptible to carcinogenesis than wild-type mice and are defective in establishing immune system induding the development and function of natural killer cells. Furthermore, VDUP1^-/- mice show impaired Kreb cycle-mediated fatty acid utilization. In this review, we have discussed the multifunctional roles of VDUP1 in diverse cellular responses, in particular its relation to proliferation, apoptosis, differentiation, and diseases such as cancer and stress-related diseases.

关键词： VDUP1 thioredoxin proliferation immune cell

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Contrast evaluation methods for natural color images in display systems: within- and cross-content evaluations

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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第11期12卷 897-909页

作者： Choon-woo kim School of Information and Communication Engineering Inha University

Contrast evaluation can be used as a criterion to evaluate performance of contrast enhancement algorithms and to compare contrast capability of display systems. This paper deals with contrast evaluation models for natural color images. Two separate models are defined for within- and cross-content evaluations. The former is to differentiate the perceived contrast of the images with the same content. The latter is to discriminate the differences in contrast among the images with different contents. Perception mechanisms are quite different for within- and cross-content evaluations. Local contrast plays an important role in within-content evaluation. In contrast, global contrast dominates the contrast perception for cross-content evaluation. Results of human visual experiments show that the proposed evaluation models outperform previous methods for both within- and cross-content evaluations.

关键词： Contrast evaluation Global contrast Local contrast Within content Cross content Statistical significance

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Non-Invasive Measurements of Thickness of Superconductor Films by Using Two-Resonant-Mode Rutile Resonator

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Chinese Physics Letters 2010年第8期27卷 203-206页

作者： JUNG Ho sang YANG woo Il LEE Jae Hun SOHN Jae Min CHOO Kee Nam kim Bong Goo LEE sang Young Department of Physics and Center for Wireless Transmission Technology Konkuk University Seoul 143-701 Korea Research Reactor Engineering Division Korea Atomic Energy Research Institute Daejeon 305-600 Korea

The film thickness should be known for extrazting the intrinsic surface resistance from the effective surface resistance as measured by using the dielectric resonator method. Thicknesses of 70 nm to 360 nm are measured for YBa2 Cu3 O7-δ films in a non-invasive way by using the two-resonant-mode dielectric resonator （TDR） method. A futile resonator with the respective resonant frequencies of 15.25-15.61 GHz and 15.10-15.37 GHz for the TE021 and the TE012 modes is used for this purpose. Differences between the values as measured by using the TDR technique and those measured by using a step profilometer appear to be less than 3%, which is smaller than the previous value of 5% as measured by using a 8. 6 GHz single-resonance mode futile resonator [Lee et al. J. Korean Phys. Soc. 54（2009）1619]. Merits of using the TDR method are discussed.

关键词： Thickness Packaging materials Films Methods Uses Measurement Tellurium Reflectometry

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Metabolomic and transcriptomic study to understand changes in metabolic and immune responses in steers under heat stress

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Animal Nutrition 2022年第4期11卷 87-101页

作者： Jun Sik Eom Da Som Park sang Jin Lee Bon-Hee Gu Shin Ja Lee sang-Suk Lee Seon-Ho kim Byeong-woo kim Sung Sill Lee Myunghoo kim Institute of Agriculture and Life Science Gyeongsang National UniversityJinju52828Republic of Korea Department of Animal Science College of Natural Resources&Life SciencePusan National UniversityMiryang50463Republic of Korea Life and Industry Convergence Research Institute Pusan National UniversityMiryang50463Republic of Korea University-Centered Labs Gyeongsang National UniversityJinju52828Republic of Korea Ruminant Nutrition and Anaerobe Laboratory Department of Animal Science and TechnologySunchon National UniversitySuncheon57922Republic of Korea Division of Applied Life Science(BK21) Gyeongsang National UniversityJinju52828Republic of Korea

Heat stress(HS)damages livestock by adversely affecting physiological and immunological ***,fundamental understanding of the metabolic and immunological mechanisms in animals under HS remains elusive,particularly in *** understand the changes on metabolic and immune responses in steers under HS condition,we performed RNA-sequencing and proton nuclear magnetic resonance spectroscopy-based metabolomics on HS-free(temperature humidity index[THI]value:64.92±0.56)and HS-exposed(THI value:79.13±0.56)Jersey steer(n=8,body weight:559.67±32.72 kg).This study clarifies the metabolic changes in 3 biofluids(rumen fluid,serum,and urine)and the immune responses observed in the peripheral blood mononuclear cells of HS-exposed *** integrated approach allowed the discovery of HS-sensitive metabolic and immunological *** metabolomic analysis indicated that HS-exposed steers showed potential HS biomarkers such as isocitrate,formate,creatine,and riboflavin(P<0.05).Among them,there were several integrative metabolic pathways between rumen fluid and ***,HS altered mRNA expression and immune-related signaling pathways.A meta-analysis revealed that HS decreased riboflavin metabolism and the expression of glyoxylate and dicarboxylate metabolism-related ***,metabolic pathways,such as the hypoxia-inducible factor-1 signaling pathway,were downregulated in immune cells by HS(P<0.05).These findings,along with the datasets of pathways and phenotypic differences as potential biomarkers in steers,can support more in-depth research to elucidate the interrelated metabolic and immunological *** would help suggest new strategies to ameliorate the effects of HS,including disease susceptibility and metabolic disorders,in Jersey steers.

关键词： Heat stress Jersey steer Metabolome Transcriptome Immunity Metabolism

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