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Real-Time Tunable Gas Sensing Platform Based on SnO_(2) Nanoparticles Activated by Blue Micro-Light-Emitting Diodes

Nano-Micro Letters 2024年第12期16卷 103-119页

作者： Gi Baek Nam Jung-El Ryu Tae Hoon Eom Seung Ju kim Jun Min Suh Seungmin Lee Sungkyun Choi Cheon Woo Moon Seon Ju Park Soo Min Lee Byungsoo kim Sung Hyuk Park Jin Wook Yang Sangjin Min Sohyeon Park Sung Hwan Cho Hyuk Jin kim Sang Eon Jun Tae Hyung Lee Yeong Jae kim Jae Young kim Young joon Hong Jong-In Shim Hyung-Gi Byun Yongjo Park Inkyu Park Sang-Wan Ryu Ho Won Jang Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Research Laboratory of Electronics Department of Mechanical EngineeringMassachusetts Institute of TechnologyCambridgeMA 02139USA Ming Hsieh Department of Electrical and Computer Engineering University of Southern CaliforniaLos AngelesCA 90089USA Department of Display Materials Engineering Soonchunhyang UniversityAsan 31538Republic of Korea Department of Photonics and Nanoelectronics BK21 FOUR ERICA-ACE CenterHanyang University ERICAAnsan 15588Republic of Korea Department of Nanotechnology and Advanced Materials Engineering Sejong UniversitySeoul 05006Republic of Korea Department of Electronics Information and Communication EngineeringKangwon National UniversitySamcheok 25913Republic of Korea Advance Institute of Convergence Technology Seoul National UniversitySuwon 16229Republic of Korea Department of Mechanical Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Department of Physics Chonnam National UniversityGwangju 500-757Republic of Korea

Micro-light-emitting diodes(μLEDs)have gained significant interest as an activation source for gas sensors owing to their advantages,including room temperature operation and low power ***,despite these benefits,challenges still exist such as a limited range of detectable gases and slow *** this study,we present a blueμLED-integrated light-activated gas sensor array based on SnO_(2)nanoparticles(NPs)that exhibit excellent sensitivity,tunable selectivity,and rapid detection with micro-watt level power *** optimal power forμLED is observed at the highest gas response,supported by finite-difference time-domain ***,we first report the visible light-activated selective detection of reducing gases using noble metal-decorated SnO_(2)*** noble metals induce catalytic interaction with reducing gases,clearly distinguishing NH3,H2,and ***-time gas monitoring based on a fully hardwareimplemented light-activated sensing array was demonstrated,opening up new avenues for advancements in light-activated electronic nose technologies.

关键词： Micro-LED Gas sensor array Low power consumption Metal decoration Real-time detection

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Zircon U-Pb ages and O-Hf isotopes of Quaternary trachytes from the East Sea:Implications for the genesis of low-δ^(18)O magmas

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Geoscience Frontiers 2024年第2期15卷 41-54页

作者： Hyun-Ok Choi Jihye Oh Chang Hwan kim soon Young Choi Won Hyuck kim Chan Hong Park Dokdo Research Center East Sea Research InstituteKorea Institute of Ocean Science and TechnologyUljin 36315Republic of Korea Deep-Sea and Seabed Mineral Resources Research Center Korea Institute of Ocean Science and TechnologyBusan 49111Republic of Korea Division of Science Education Kangwon National University1 Gangwondaehak-gilChuncheon-siGangwon-do 24341Republic of Korea

Quaternary intraplate magmatism formed several volcanic islands and seamounts,including Dokdo(DD),Ulleungdo(UD),Simheungtack(ST),Anyongbok,and Isabu in the southwest of the East Sea back-arc *** this study,we present whole-rock geochemical,zircon U–Pb age,and in situ O–Hf isotope data for the submerged volcanic rocks from DD,UD,and ST to provide new insights into the eruption timing of these volcanoes and constrain the magma evolution *** samples used in this study were trachytes and exhibited ferroan,alkalic,and metaluminous to weakly peraluminous *** showed light rare earth element(REE)-enriched patterns with(La/Yb)N ratios of 25.3–31.7 and mostly negative Eu anomalies in a chondrite-normalized REE *** addition,they were enriched in large-ion lithophile elements and high field strength elements;they exhibited positive Pb anomalies and strongly negative Ba,Sr,P,and Ti *** zircons yielded a weighted-mean 206Pb/238U age of 2.61,0.348–0.704,and 2.76–2.94 Ma for the DD,UD,and ST trachytes,*** zircons exhibited lowerδ^(18)O values than normal depleted mantle values,regardless of the crystallization age and spatial distribution of ***δ^(18)O values showed no correlation with U contents or Th/U ratios,indicating that the lowδ^(18)O signatures were of primary magmatic *** Hf isotopic compositions of the zircons were relatively heterogeneous but predominately characterized by positive eHf *** O–Hf mixing modeling revealed that low-δ^(18)O rocks with positive eHf values from the UD and ST volcanoes were derived from a hybrid source of recycled juvenile crustal materials with low-δ^(18)O and positive eHf signatures and an enriched mantle source with normalδ^(18)O and negative eHf *** juvenile oceanic crust in the source was likely metasomatized by seawater at high temperatures prior to *** contrast,the felsic magma that formed the DD volcanoes may have assimilated with regional

关键词： Quaternary intraplate volcanism East Sea Zircon O-Hf isotopes Low-δ^(18)O magma Recycled juvenile oceanic crust

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Topically administered bevacizumab had longer standing anti-angiogenic effect than subconjunctivally injected bevacizumab in rat corneal neovacularization

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International Journal of Ophthalmology(English edition) 2013年第5期6卷 588-591页

作者： Jae Yong kim Dong Yoon kim Eun-soon kim Myoung joon kim Hungwon Tchah Department of Ophthalmology University of Ulsan College of MedicineAsan Medical Center

AIMTo compare the effect of topically administered and subconjunctivally injected bevacizumab on experimental corneal neovascularization in rats for two weeks after treatment.

关键词： corneal neovascularization bevacizumab topical and subconjunctival administration

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The efficacy of *** adjuvant chemotherapy on biliary tract cancer after R0 resection

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Chinese Journal of Cancer 2017年第5期36卷 222-230页

作者： Young Saing kim Chi-Young Jeong Haa-Na Song Tae Hyo kim Hong Jun kim Young-joon Lee soon Chan Hong Division of Hematology and Oncology Department of Internal MedicineGachon University Gil Medical Center Incheon 405.706 South Korea Department of Surgery Institute of Health Sciences Gyeongsang National University Hospital Gyeongsang National University School of Medicine 79 Gangnam-roJinju 660.702 South Korea Department of Internal Medicine Institute of Health Sciences Gyeongsang National University Hospital Gyeongsang National University School of Medicine Jinju 660.702 South Korea.

Background: The optimal treatment strategy for biliary tract cancer(BTC) after curative?intent resection remains con?troversial. The purpose of this study was to evaluate the efficacy of fluoropyrimidine?based adjuvant chemotherapy for BTC patients undergoing microscopically margin?negative(R0) ***: We retrospectively analyzed the clinical data of BTC patients who underwent curative?intent R0 resection. Patients were eligible if they received either fluoropyrimidine?based adjuvant chemotherapy or observation after R0 ***: A total of 153 patients were included. In the entire patient cohort, no significant differences were observed in 5?year overall survival(OS) rates(48.4% vs. 39.6%, P = 0.439) or 3?year recurrence?free survival(RFS) rates(49.1% vs. 39.5%, P = 0.299) between patients who received fluoropyrimidine?based adjuvant chemotherapy or observation. However, for patients with stages Ⅱ and Ⅲ BTC, chemotherapy significantly improved 5?year OS rate(52.4% vs. 35.6%, P = 0.002) and 3?year RFS rate(55.5% vs. 39.1%, P = 0.021) compared with ***: Fluoropyrimidine?based adjuvant chemotherapy may prolong the survival of patients with stages Ⅱ and Ⅲ BTC after R0 resection.

关键词： Biliary tract cancer Adjuvant chemotherapy Fluoropyrimidine R0 resection Prognosis

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Uncertainty analysis of flow rate measurement for multiphase flow using CFD

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Acta Mechanica Sinica 2015年第5期31卷 698-707页

作者： joon-Hyung kim Uk-Hee Jung Sung kim joon-Yong Yoon Young-Seok Choi Department of Mechanical Design Engineering Hanyang University Thermal & Fluid System R&BD Group Korea Institute of Industrial Technology Energy System Engineering University of Science and Technology

The venturi meter has an advantage in its use,because it can measure flow without being much affected by the type of the measured fluid or flow ***,it has excellent versatility and is being widely applied in many *** flow of a liquid containing air is a representative example of a multiphase flow and exhibits complex flow *** particular,the greater the gas volume fraction（GVF）,the more inhomogeneous the flow *** a result,using a venturi meter to measure the rate of a flow that has a high GVF generates an *** this study,the cause of the error occurred in measuring the flow rate for the multiphase flow when using the venturi meter for analysis by *** ensure the reliability of this study,the accuracy of the multiphase flow models for numerical analysis was verified through comparison between the calculated results of numerical analysis and the experimental *** a result,the Grace model,which is a multiphase flow model established by an experiment with water and air,was confirmed to have the highest ***,the characteristics of the internal flow Held about the multiphase flow analysis result generated by applying the Grace model were analyzed to find the cause of the uncertainty occurring when measuring the flow rate of the multiphase flow using the venturi meter.A phase separation phenomenon occurred due to a density difference of water and air inside the venturi,and flow inhomogeneity happened according to the flow velocity difference of each *** was confirmed that this flow inhomogeneity increased as the GVF increased due to the uncertainty of the flow measurement.

关键词： Multiphase flow Measurement Numerical analysis Venturi meter Gas volume fraction(GVF) Uncertainty Multiphase flow model Grace model

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Feasibility of wear reduction for soft nanostructured thin film through enhanced elastic recoverability and contact stress relief

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Friction 2023年第7期11卷 1292-1306页

作者： Kuk-Jin SEO Hyun-joon kim Dae-Eun kim Department of Mechanical Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Precision Mechanical Engineering Kyungpook National UniversitySangju 37224Republic of Korea Department of Advanced Science and Technology Convergence Kyungpook National UniversitySangju 37224Republic of Korea

This work shows that a soft,thin film comprising randomly aligned carbon nanotubes(CNTs)can reduce surface wear more effectively than a homogeneous thin film because of enhanced elastic recoverability and contact stress relief originating from its mesh *** investigate the wear characteristics of the mesh structure compared to those of the homogeneous thin film,multi-walled CNTs(MWCNTs)and diamond-like carbon(DLC)thin films were prepared to conduct nanoscale tribological experiments using the atomic force microscopy(AFM).The MWCNT thin film showed unmeasurably low wear compared with the DLC thin film under a certain range of normal *** demonstrate the wear reduction mechanism of the MWCNT thin film,its indentation and frictional behaviors were *** indentation behavior of the MWCNT thin film revealed repetitive elastic deformation with a wide strain range and a significantly lower elastic modulus than that of the DLC thin *** permanent deformation of the MWCNT thin film was observed through frictional experiments under relatively high normal load *** results are expected to provide insights into the design of highly wear-resistant surfaces using nanostructures.

关键词： carbon nanotube(CNT) thin film wear friction elastic recovery

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Surface treatment to improve corrosion resistance of Al plate heat exchangers

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中国有色金属学会会刊：英文版 2009年第B9期19卷 28-31页

作者： Jong-soon kim Tae-Ho KANG In-Kwan kim Department of Mechanical Engineering Pu kyong National University

The correlations between thermal and physical properties were studied through thermal conductivity measurements, hardness tests, salt spray tests (AASS) among the surface treatment samples named K20, K40 with thickness of 20, 40 μm respectively and raw sample named K00. In thermal conductivity measurements, there are little differences among the samples as K00, K20 and K40, they exhibit 153.39, 150.69 and 149.76 W/(m·K), respectively. According to hardness tests, K00, K20 and K40 exhibit 87.9, 259.7 and 344.8 in Vickers values. In the result of salt spray tests to examine the effects on corrosion resistance, K00, K20 and K40 exhibit the grade of 3?5, 2.0?9.8 and 10, respectively. The mutual relation of the above results was analyzed. It is found that the surface treatments do not affect the thermal conductivity of aluminum and result in the improvement of physical properties. As a result of the technology, the surface improvement of aluminum alloy specimen is achieved without thermal degradation. It validates the ability of the aluminum plate heat exchangers with surface treatment to enhance the corrosion resistance. Present work is performed as the first fundamental threshold in the process of aluminum plate heat exchangers development to check out its possibility, therefore the next step-experimental and numerical study of practical aluminum plate heat exchangers will be made.

关键词：板式换热器表面处理耐铝性物理性能导热系数硬度测试盐雾试验耐腐蚀性

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Efficacy of Saam acupuncture treatment on improvement of immune cell numbers in cancer patients:a pilot study

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Journal of Traditional Chinese Medicine 2014年第5期34卷 550-554页

作者： Dae-joon kim Seong-Hoon Park Jung-Chul Seo Kyung soon kim Ki Cheul Sohn Im Hee Shin Hun Mo Ryoo Department of Internal Medicine Oriental Medical HospitalDaegu Haany UniversityDaegu 730-090Korea Department of Research Comprehensive and Integrative Medicine InstituteDaegu 705-030Korea Department of Preventive Medicine Hospital of Catholic University of DaeguDaegu 705-718Korea Department of Medical Statistics School of MedicineCatholic University of DaeguDaegu 705-718Korea Department of Internal Medicine School of MedicineCatholic University of DaeguDaegu 705-718Korea

OBJECTIVE: To collect preliminary data on the effects of Saam acupuncture with regard to the immunity in cancer ***: Ten cancer patients were analyzed for improvements in immunity. Acupuncture was applied at the 5 acupuncture points, Jingqu(LU 8), Zutonggu(BL 66), Yanggu(SI 5), Yangchi(TE 4), and Zhongwan(CV 12) for 2 weeks with 4 sessions. We assessed the effect of Korean Saam acupuncture on the immune system in cancer patients by measuring particular blood cell subsets, including CD3 +,CD4+, CD8+, CD19+, and CD56+ cells, as well as total white blood cell count, absolute neutrophil count, and fatigue score. The measurement was performed before and after acupuncture and at a 2-week ***: There was a statistically significant increase in the number of CD3+(P=0.023) and CD8+ cells(P<0.001) and T-cell subsets, as well as a decrease in the fatigue severity scale(FSS) score(P=0.001) after Saam acupuncture using the 5 ***: Acupuncture may improve the immune system by increasing the counts of a few immune cells and relieve fatigue in cancer patients by decreasing FSS scores. Although this was a non-controlled study, it constitutes preliminary research investigating the potential effects of Saam acupuncture in increasing the counts of several immune cells in cancer patients.

关键词： Acupuncture Leukocyte count Neutro-phils Fatigue severity scale Pilot projects

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Hepatitis B virus mutations related to liver disease progression of Korean patients

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World Journal of Gastroenterology 2014年第2期20卷 460-467页

作者： Bum-joon kim Department of Biomedical Sciences Microbiology and ImmunologyLiver Research Instituteand Cancer Research InstituteCollege of MedicineSeoul National UniversitySeoul 110-799South Korea

Hepatitis B virus(HBV)infection is a global health problem and more than 350 million people worldwide are chronic carriers of the *** the recent dramatic decline in HBV chronic patients through successful programs of hepatitis B surface antigen vaccination,South Korea is still recognized as an endemic area of HBV *** infections in South Korea exhibit several distinct features in epidemiologic and clinical *** this review paper,we summarize the distinct HBV mutation patterns related to clinical severity and the molecular epidemiologic traits in Korean chronic patients based on previous ***,several lines of evidence,including our previous results,have led to the conclusion that a combination of the exclusive predominance of genotype C2,which is prone to mutations,the high prevalence of basal core promoter double mutations,and the presence of distinct immune responses against HBV proteins in the Korean population may generate the distinct HBV variants rarely or not encountered in other areas,which results in distinct clinical manifestations in Korean chronic *** may provide a novel insight into the relationships between clinical severity,HBV genotype distribution,and HBV naturally occurring variants.

关键词： Hepatitis B virus Mutation South Korea Hepatocellular carcinoma Genotype C2

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High-risk esophageal varices in patients treated with locoregional therapy for hepatocellular carcinoma:Assessment with liver computed tomography

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World Journal of Gastroenterology 2012年第35期18卷 4905-4911页

作者： Hyojin kim Dongil Choi joon Hyeok Lee soon Jin Lee Hangi Jo Geum-Youn Gwak Kwang Cheol Koh Moon Seok Choi Seonwoo kim Department of Radiology and Center for Imaging Science Samsung Medical CenterSungkyunkwan University School of Medicine Department of Medicine Samsung Medical CenterSungkyunkwan University School of Medicine Biostatistics Unit Samsung Biomedical Research InstituteSamsung Medical CenterSungkyunkwan University School of Medicine

AIM： To assess the diagnostic performance of follow- up liver computed tomography （CT） for the detection of high-risk esophageal varices in patients treated with Io- coregional therapy for hepatocellular carcinoma （HCC）. METHODS： We prospectively enrolled 100 patients with cirrhosis who underwent transcatheter arterial chemoembolization, radiofrequency ablation or both procedures for HCCs. All patients underwent upper endoscopy and subsequently liver CT. Three radiolo- gists independently evaluated the presence of high-riskesophageal varices with transverse images alone and with three orthogonal multiplanar reformation （MPR） images, respectively. With endoscopic grading as the reference standard, diagnostic performance was as- sessed by using receiver operating characteristic （ROC） curve analysis. RESULTS： The diagnostic performances （areas under the ROC curve） of three observers with transverse im- ages alone were 0.947 ± 0.031, 0.969 ± 0.024, and 0.916 ＋ 0.038, respectively. The mean sensitivity, spec- ificity, positive predicative value （PPV）, and negative predicative value （NPV） with transverse images alone were 90.1%, 86.39%, 70.9%, and 95.9%, respectively. The diagnostic performances, mean sensitivity, specific- ity, PPV, and NPV with three orthogonal MPR images （0.965 ± 0.025, 0.959 ± 0.027, 0.938 ± 0.033, 91.4%, 89.5%, 76.3%, and 96.6%, respectively） were not su- perior to corresponding values with transverse images alone （P 〉 0.05）, except for the mean specificity （P = 0.039）. CONCLUSION： Our results showed excellent diagnos- tic performance, sensitivity and NPV to detect high-risk esophageal varices on follow-up liver CT after Iocore- gional therapy for HCC,

关键词： Liver computed tomography High-riskesophageal varices Locoregional therapy Hepatocel-lular carcinoma Multiplanar reformation images

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