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Nano Research 2017年第9期10卷 3178-3188页

作者： jung hyun kim Yun Chan Kang Department of Materials Science and Engineering Korea University Anam-Dong Seongbuk-Gu Seou1136-713 Republic of Korea

Multicomponent metal sulfide materials with a yolk–shell structure and a single phase were studied for the first time as anode materials for sodium-ion batteries. Yolk–shell-structured Fe–Ni–O powders with a molar ratio of iron and nickel components of 1/1 were prepared via one-pot spray pyrolysis. The prepared Fe–Ni–O powders were transformed into yolk–shell-structured (Fe0.5Ni0.5)9S8 solid-solution powders via a sulfidation process. The initial discharge and charge capacities of the (Fe0.5Ni0.5)9S8 powders at a current density of 1 A·g−1 were 601 and 504 mA·h·g−1, respectively. The discharge capacities of the (Fe0.5Ni0.5)9S8 powders for the 2nd and 100th cycle were 530 and 527 mA·h·g−1, respectively, and their corresponding capacity retention measured from the 2nd cycle was 99%. The (Fe0.5Ni0.5)9S8 powders had high initial discharge and charge capacities at a low current density of 0.1 A·g−1, and the reversible discharge capacity decreased slightly from 568 to 465 mA·h·g−1 as the current density increased from 0.1 to 5.0 A·g−1. The synergetic effect of the novel yolk–shell structure and the multicomponent sulfide composition of the (Fe0.5Ni0.5)9S8 powders resulted in excellent sodium-ion storage performance.

关键词： metal sulfide multicomponent sulfide yolk–shell sodium-ion batteries spray pyrolysis

Direct synthesis of highly conductive poly（3,4- ethylenedioxythiophene）：poly（4-styrenesulfonate）（PEDOT：PSS）/graphene composites and their applications in energy harvesting systems

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Nano Research 2014年第5期7卷 717-730页

作者： Dohyuk Yoo Jeonghun kim jung hyun kim Department of Chemical and Biomolecular Engineering Yonsei University 50 Yonsei-ro Seodaemun-gu Seou1120-749 Republic of Korea Electronic Materials Division R&D Center Dongjin Semichem Co. Ltd. 625-3 Yodang-Ri Yanggam-Myeon Hwaseong-Gun Gyeonggi-Do Republic of Korea

We report for the first time highly conductive poly（3,4-ethylenedioxythiophene）： poly（4-styrenesulfonate）（PEDOT：PSS）/graphene composites fabricated by in situ polymerization and their applications in a thermoelectric device and a platinum （Pt）-free dye-sensitized solar cell （DSSC） as energy harvesting systems. Graphene was dispersed in a solution of poly（4-styrenesulfonate）（PSS） and polymerization was directly carried out by addition of 3,4-ethylenedioxythiophene （EDOT） monomer to the dispersion. The content of the graphene was varied and optimized to give the highest electrical conductivity. The composite solution was ready to use without any reduction process because reduced graphene oxide was used. The fabricated film had a conductivity of 637 ***-1, corresponding to an enhancement of 41%, after the introduction of 3 wt.% graphene without any further complicated reduction processes of graphene being required. The highly conductive composite films were employed in an organic thermoelectric device, and the device showed a power factor of 45.7 μW·m^-1K^-2 which is 93% higher than a device based on pristine PEDOT：PSS. In addition, the highly conductive composite films were used in Pt-free DSSCs, showing an energy conversion efficiency of 5.4%, which is 21% higher than that of a DSSC based on PEDOT：PSS.

关键词： direct synthesis conductive polymer graphene composite thermoelectric material dye-sensitized solar cell

Slip-enhanced Reverse Electrodialytic Power Generation in Ion-selective Nanochannels

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Journal of Thermal Science 2013年第1期22卷 36-41页

作者： Byeongdong Kang Jaisuk Yoo hyun jung kim Dong-Kwon kim Department of Mechanical Engineering Ajou University

Power generation by reverse electrodialysis in ion-selective nanochannels is numerically investigated. Especially,in the present study, the influence of hydrodynamic slip at the surface of nanochannels is investigated. The current-potential characteristics of the nanochannels are calculated by solving several governing equations:Nernst-Planck equation for the ionic concentrations, the Poisson equation for the electric potential, and the Navier-Stokes equation for the diffusioosmotic flow. Hydrodynamic slip is applied as the boundary condition at the surface of nanochannels. As the slip length increases, the diffusioosmotic flow velocity and electrical conductance of ions increase because the friction at the surface of nanochannels decreases. It is shown that the power generation is enhanced by 44% with a moderate 100nm slip length by using a nanochannel with 10nm height.

关键词： Reverse electrodialysis Ion-selective nanochannel Power generation Slip length

Numerical Computation of Motions and Structural Loads for Large Containership using 3D Rankine Panel Method

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Journal of Marine Science and Application 2017年第4期16卷 417-426页

作者： jung-hyun kim Yonghwan kim Department of Naval Architecture & Ocean Engineering Seoul National University Seoul 08826 Korea

In this paper, we present the results of our numerical seakeeping analyses of a 6750-TEU containership, which were subjected to the benchmark test of the 2 nd ITTC–ISSC Joint Workshop held in 2014. We performed the seakeeping analyses using three different methods based on a 3D Rankine panel method, including 1) a rigid-body solver, 2) a flexible-body solver using a beam model, and 3) a flexible-body solver using the eigenvectors of a 3D Finite Element Model(FEM). The flexible-body solvers adopt a fully coupled approach between the fluid and structure. We consider the nonlinear Froude–Krylov and restoring forces using a weakly nonlinear approach. In addition, we calculate the slamming loads on the bow flare and stern using a 2D generalized Wagner model. We compare the numerical and experimental results in terms of the linear response, the time series of the nonlinear response, and the longitudinal distribution of the sagging and hogging moments. The flexible-body solvers show good agreement with the experimental model with respect to both the linear and nonlinear results, including the high-frequency oscillations due to springing and whipping vibrations. The rigid-body solver gives similar results except for the springing and whipping.

关键词： Rankine panel method fluid-structure interaction benchmark test containership springing, whipping

Caulerpa okamurae extract attenuates inflammatory interaction,regulates glucose metabolism and increases insulin sensitivity in 3T3-L1 adipocytes and RAW 264.7 macrophages

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Journal of Integrative Medicine 2020年第3期18卷 253-264页

作者： Bikash Manandhar hyun jung kim Dong Young Rhyu Department of Oriental Medicine Resources and Institute of Korean Herbal Medicine Industry Mokpo National UniversityJeonnam 58554South Korea College of Pharmacy Mokpo National UniversityJeonnam 58554South Korea

Objective: To examine whether Caulerpa okamurae ethanolic extract(COE) could inhibit obesitymediated inflammation, improve glucose metabolism and increase insulin sensitivity, using in vitro cell models of RAW 264.7 macrophages and 3 T3-L1 ***: We cocultured 3 T3-L1 adipocytes in direct contact with lipopolysaccharide-stimulated RAW264.7 macrophages and induced insulin resistance in 3 T3-L1 adipocytes with tumor necrosis factor-a(TNF-a) in the presence or absence of 250 mg/m L of COE. We investigated various markers of inflammation, glucose regulation and insulin sensitivity in these models using Griess reagent to measure nitric oxide(NO) production, 2-[N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl) amino]-2-deoxyglucose to measure glucose uptake, Western blot analysis to quantify protein expression and reverse transcriptasepolymerase chain reaction to evaluate m RNA ***: We found that COE(250 mg/m L) significantly inhibited the lipopolysaccharide-induced inflammatory response in RAW 264.7 macrophages by downregulating NO production, nitric oxide synthase 2 expression and nuclear translocation of nuclear factor-j B. COE also showed similar anti-inflammatory activity in coculture, along with decreased TNF-a, interleukin-6 and monocyte chemoattractant protein m RNA expression. In addition, COE also improved glucose uptake in coculture by upregulating glucose transporter-4(GLUT-4) and adiponectin and reducing serine phosphorylation of insulin receptor substrate-1(IRS1). In the TNF-a-induced insulin resistance model of 3 T3-L1 adipocytes, COE significantly improved both basal and insulin-stimulated glucose uptake, accompanied by phosphorylation of IRS1 at tyrosine 632, phospho-50 adenosine monophosphate-activated protein kinase a and glycogen synthase kinase-3 b(Ser9) as well as upregulation of ***: Together, these findings suggest that COE has potential to treat or prevent obesity-induced metabolic disorders.

关键词： Caulerpa okamurae RAW 264.7 macrophages 3T3-L1 adipocytes Coculture Metabolic disorder

Intraoperative photodynamic therapy for tracheal mass in non-small cell lung cancer:A case report

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World Journal of Clinical Cases 2023年第16期11卷 3915-3920页

作者： Hee Suk jung hyun jung kim Kwan Wook kim Department of Thoracic and Cardiovascular Surgery CHA Bundang Medical CenterSeongnam-si 13496South Korea

BACKGROUND Tracheal neoplasms represent less than 0.1%of all malignancies and have no established treatment *** resection with reconstruction is the primary *** study demonstrates successful treatment of concurrent lung and tracheal tumors using surgical excision and intraoperative photodynamic therapy(PDT),highlighting the effectiveness and safety of this *** SUMMARY A 74-year-old male with a history of smoking and chronic obstructive pulmonary disease was diagnosed with tracheal squamous cell carcinoma and right lower lobe adenocarcinoma.A multidisciplinary team created a treatment plan involving tumor resection and *** tracheal tumor was removed through a tracheal incision and this was followed by intraluminal *** trachea was repaired and a right lower lobectomy was *** patient received a second PDT treatment postoperatively and was discharged 10 d after the tracheal surgery,without *** then underwent platinum-based chemotherapy for lymphovascular invasion of lung ***-month postoperative bronchoscopy revealed normal tracheal mucosa with a scar at the resection site and no evidence of tumor recurrence in the trachea or *** Our case of concurrent tracheal and lung cancers was successfully treated with surgical excision and intraoperative PDT which proved safe and effective in this patient.

关键词： Tracheal neoplasm Non-small cell lung carcinoma Pulmonary surgical procedure Photochemotherapy Prognosis Case report

Occurrence and distribution of hydroxylated isoprenoid glycerol dialkyl glycerol tetraethers(OH-GDGTs) in the Han River system, South Korea

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Acta Geochimica 2017年第3期36卷 367-369页

作者： Sujin Kang Kyoung-Hoon Shin jung-hyun kim Department of Marine Science and Convergence Technology Hanyang University Ansan Korea Korea Polar Research Institute 26 Songdomirae-ro Yeonsugu Incheon Korea

We investigated the occurrence and distribution of terrestrial-derived hydroxylated isoprenoid glycerol dialkyl glycerol tetraethers(OH-GDGTs) in the Han River system and their potential impact on the application of the ring index of OH-GDGTs(RI-OH) as a sea surface temperature(SST) proxy in the eastern Yellow Sea. Thereby, we analyzed various samples collected along the Han River and from its surrounding areas(South Korea, n = 34). The OHGDGTs were found in all samples investigated. OH-GDGT-0 was the dominant OH-GDGT component in the estuary and marine samples while OH-GDGT-2 was generally dominant in the soils, the lake sediments and the river suspended particulate matter(SPM). Our results thus suggests a possible warm bias of the RI-OH-derived summer SSTs in the coastal zone to which a large amount of terrestrial organic matter is being supplied. Further studies are necessary to better assess the applicability of the RI-OH proxy in the eastern Yellow Sea.

关键词： Hydroxylated isoprenoid glycerol dialkyl glycerol tetraethers(OH-GDGTs) Sea surface temperature(SST) Han river Yellow Sea

Impact of UV-A Radiation on Erythemal UV and UV-index Estimation over Korea

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Advances in Atmospheric Sciences 2015年第12期32卷 1639-1646页

作者： Sang Seo PARK Yun Gon LEE jung hyun kim Department of Atmospheric Sciences Yonsei University Department of Atmospheric Sciences Chungnam National University

Because total UV （TUV） in the UV-A region is 100 times higher than in the UV-B region, UV-A is a considerable compo- nent when calculating erythemal UV （EUV） and UV-index. The ratio of EUV to TUV in the UV-A value [EUV（A）/TUV（A）] is investigated to convert the EUV（A） from TUV（A） for broadband observation. The representative value of EUV（A）/TUV（A）, from the simulation study, is 6.9 × 10^- 4 changing from 6.1 ×10^-4 to 7.0 × 10^ -4 as aerosol optical depth, total ozone and solar zenith angle change. By adopting the observational data of EUV（B） and TUV（A） from UV-biometer measurements at Yonsei University [（37.57°N, 126.95°E）, 84 m above sea level], the EUV irradiance increases to 15% of EUV（B） due to the consideration of EUV（A） from the data of TUV（A） observation. Compared to the total EUV observed from the Brewer spec- trophotometer at the same site, the EUV（B） from the UV-biometer observes only 95% of total EUV, and its underestimation is caused by neglecting the effect of UV-A. However, the sum of EUV（B） and EUV（A） [EUV（A＋B）] from two UV-biometers is 10% larger than the EUV from the Brewer spectrophotometer because of the spectral overlap effect in the range 320-340 nm. The correction factor for the overlap effect adjusts 8% of total EUV.

关键词： erythemal UV total UV UV-B UV-biometer

Hwangryunhaedok-tang induces the depolarization of pacemaker potentials through 5-HT3 and 5-HT4 receptors in cultured murine small intestine interstitial cells of Cajal

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World Journal of Gastroenterology 2017年第29期23卷 5313-5323页

作者： hyun jung kim Guem San Lee hyungwoo kim Byung Joo kim Division of Longevity and Biofunctional Medicine Healthy Aging Korean Medical Research Center School of Korean Medicine Pusan National University Wonkwang University College of Korean Medicine Division of Pharmacology School of Korean Medicine Pusan National University Division of Longevity and Biofunctional Medicine School of Korean Medicine Pusan National University

AIM To investigate the effects of a water extract of Hwangryunhaedok-tang(HHTE) on the pacemaker potentials of mouse interstitial cells of Cajal(ICCs).METHODS We dissociated ICCs from small intestines and cultured. ICCs were immunologically identified using an antic-kit antibody. We used the whole-cell patch-clamp configuration to record the pacemaker potentials generated by cultured ICCs under the current clamp mode(I = 0). All experiments were performed at 30 ℃-32 ℃RESULTS HHTE dose-dependently depolarized ICC pacemaker potentials. Pretreatment with a 5-HT_3 receptor anta-gonist(Y25130) or a 5-HT_4 receptor antagonist(RS39604) blocked HHTE-induced pacemaker potential depolarizations, whereas pretreatment with a 5-HT7 receptor antagonist(SB269970) did not. Intracellular GDPβS inhibited HHTE-induced pacemaker potential depolarization and pretreatment with a Ca^(2+)-free solution or thapsigargin abolished the pacemaker potentials. In the presence of a Ca^(2+)-free solution or thapsigargin, HHTE did not depolarize ICC pacemaker potentials. In addition, HHTE-induced pacemaker potential depolarization was unaffected by a PKC inhibitor(calphostin C) or a Rho kinase inhibitor(Y27632). Of the four ingredients of HHT, Coptidis Rhizoma and Gardeniae Fructus more effectively inhibited pacemaker potential *** These results suggest that HHTE dose-dependently depolarizes ICC pacemaker potentials through 5-HT_3 and 5-HT_4 receptors via external and internal Ca^(2+) regulation and via G protein-, PKC-and Rho kinase-independent pathways.

关键词： Hwangryunhaedok-tang Interstitial cells of Cajal Pacemaker potentials Gastrointestinal tract Motility

Influence of glass-based dental ceramic type and thickness with identical shade on the light transmittance and the degree of conversion of resin cement

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International Journal of Oral Science 2018年第1期10卷 44-49页

作者： Soram Oh Su-Mi Shin hyun-jung kim Janghyun Paek Sung-Joon kim Tai hyun Yoon Sun-Young kim Department of Conservative Dentistry Graduate School Kyung Hee University Seoul Korea Department of Prosthodontics School of Dentistry Kyung Hee University Seoul Korea Department of Dentistry School of Medicine Jeju National University Jeju Korea Department of Physics Korea University Seoul Korea and SDepartment of Conservative Dentistry Dental Research Institute School of Dentistry Seoul National University Seoul Korea

The purpose of this study was to assess the influence of the types and thicknesses of glass ceramic plates on light transmittance and compare the degrees of conversion(DC) of resin cement under the ceramic materials. Three ceramic plates with thicknesses of 0.5, 1.0, 2.0, and 4.0 mm were fabricated from each of five commercial ceramic blocks in shade A2: high-translucency and low-translucency IPS Empress CAD(EmpHT and EmpLT); high-translucency and low-translucency IPS *** CAD(EmxHT and EmxLT); and Vita Mark Ⅱ(Vita). The translucency parameter was obtained using a colorimeter. The light transmittance rate was measured using a photodetector attached to an optical power meter. The DC of a resin cement(Variolink N) underneath the ceramic plates was examined by Fourier transform infrared spectroscopy. The translucency parameter, light transmittance rate, and DC showed significant differences by ceramic type and thickness(P 0.05). Both type and thickness of the glass ceramics significantly influenced the light transmittance and DC of the light-cured resin cement beneath the ceramic of the same shade.

关键词： MICROTENSILE BOND STRENGTH MECHANICAL-PROPERTIES LUTING AGENT CURING MODE POLYMERIZATION TRANSMISSION TRANSLUCENCY COMPOSITE PORCELAIN HARDNESS