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- 저자 : Kihyun KIM (검색결과 473 건)
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Kim, Jinbum,Shin, Ilgyou,Park, Taejin,Kim, Jinyong,Choi, Seongheum,Lee, Sungho,Hong, Seongpyo,Lee, Hyung-Ik,Won, Jung Yeon,Kim, Taegon,Kim, Yihwan,Hwang, Kihyun,Lee, Hoo-Jeong,Kim, Hyoungsub Elsevier 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.788 No.-
<P><B>Abstract</B></P> <P>Pulsed-laser annealing (PLA) was performed on a preformed Pt-doped Ni-rich silicide film (Ni<SUB>2</SUB>Si phase), and its microstructural and phase evolution were studied from submelting to melting condition by varying the laser power density (<I>P</I>). Vertically nonuniform compositional profile with an interfacial intermixing was observed under a solid state reaction regime (<I>P</I> < 400 mJ/cm<SUP>2</SUP>) due to a limited atomic diffusion. At higher <I>P</I> condition, melting/resolidification occurred with a continuous increase in the Si concentration, and various microstructures of the film evolved with increasing <I>P</I>: amorphous structure and nucleation/growth of NiSi and NiSi<SUB>2</SUB> phases form in that order on the Si interface. Lastly, by applying additional rapid thermal annealing on the polycrystalline mixture of NiSi and NiSi<SUB>2</SUB> phases formed by PLA, a uniform Pt-doped NiSi<SUB>2</SUB> film with strong epitaxial growth tendency on the Si(001) substrate and high thermal stability (up to 900 °C) was synthesized.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Pt-doped Ni-silicides are formed using pulsed-laser annealing at various powers. </LI> <LI> Power-dependent solid- and liquid-state reactions yield various microstructures. </LI> <LI> Power-dependent microstructural and phase evolution paths are suggested. </LI> <LI> Additional rapid thermal annealing forms a thermally stable NiSi<SUB>2</SUB> film. </LI> </UL> </P>
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Kim, Kihyun,Kim, Sung-Kon,Park, Jung Ock,Choi, Seong-Woo,Kim, Ki-Hyun,Ko, Taeyun,Pak, Chanho,Lee, Jong-Chan Elsevier 2017 Journal of membrane science Vol.537 No.-
<P><B>Abstract</B></P> <P>A series of pore-filling membranes are prepared by impregnating porous cross-linked benzoxazine-benzimidazole copolymer P(<I>p</I>BUa-<I>co</I>-BI) substrates with sulfonated poly(arylene ether sulfone)s (SPAES)s having different degree of sulfonation for polymer electrolyte membrane fuel cells operating at high-temperatures (>100°C) and low-humidity (<50% RH) conditions. The SPAESs are synthesized by reacting 4,4’-dihydroxybiphenyl with the mixtures of disulfonate-4,4’-difluorodiphenylsulfone and 4,4’-difluorodiphenylsulfone in different ratios. The porous P(<I>p</I>BUa-<I>co</I>-BI) substrates are prepared by extracting dibutyl phthalate (DBP) included in P(<I>p</I>BUa-<I>co</I>-BI) films using methanol. The P(<I>p</I>BUa-<I>co</I>-BI) films are prepared by stepwise heating the casted <I>N,N-</I>dimethylacetamide solution containing the mixtures of poly[2,2′-(<I>m</I>-phenylene)-5,5′-bibenzimidazole] (PBI), 3-phenyl-3,4- dihydro-6-<I>tert</I>-butyl-2<I>H</I>-1,3-benzoxazine (<I>p</I>BUa), and DBP to 220°C. The pore-filling membranes are found to have much improved dimensional stability and mechanical strength compared with the SPAES membranes. Although the proton conductivity values of the pore-filling membranes are slightly smaller than those of the SPAES membrane, their cell performance is superior to that of the SPAES membrane at 120°C and 40% RH conditions because ultrathin pore-filling membranes (15–20µm) having high mechanical strength can be prepared and they can contain a larger content of chemically-bound water.</P> <P><B>Highlights</B></P> <P> <UL> <LI> SPAESs having different degree of sulfonation were synthesized as pore-filling polymers. </LI> <LI> Transparent, ultrathin, and highly-flexible pore-filling membranes were developed. </LI> <LI> Acid-base interaction between the porous substrate and filling SPAES was found. </LI> <LI> Excellent physical stability and mechanical strength of the pore-filling membranes. </LI> <LI> Cell performances of MEAs from the pore-filling membranes were highly improved. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Kihyun Kim,Namgon Kim,Sung-Hyun Hwang,Yong-Kweon Kim,Youngwoo Kwon IEEE 2013 IEEE transactions on microwave theory and techniqu Vol.61 No.5
<P>A fully integrated broadband multi-state reflectometer (MSR) covering both 2- and 16-GHz bands is developed using microelectromechanical systems and monolithic-microwave integrated-circuit technology for complex permittivity measurement of biological material. The MSR consists of a dual-band phase-locked loop, a power amplifier, a directional coupler, an impedance tuner, two RF power detectors, and a micromachined silicon planar probe with an open-ended coaxial aperture. All the active and passive circuit components have been integrated on the micromachined probe platform in a small form factor of 6.8 mm × 50 mm × 0.6 mm. To cover a broad bandwidth ranging from 2 to 16 GHz, the circuit components have been designed with multi-octave characteristics. The performance of the fabricated reflectometer has been verified by comparing the measured permittivities of 0.9% saline, pork muscle, and pork fat with the reference data. To the best of our knowledge, this is the first demonstration of a miniaturized active integrated broadband reflectometer for complex permittivity measurement of biological material.</P>
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Kim, Seok Jin,Lee, Ga Yeon,Jang, Hye Ryoun,Choi, Jin-Oh,Kim, Jung Sun,Kim, Hee-Jin,Lee, Soo-Youn,Min, Ju-Hong,Jeon, Eun-Seok,Kim, Kihyun Informa UK Ltd. 2013 Amyloid Vol.20 No.4
<P>Autologous stem cell transplantation (ASCT) has improved the prognosis of selected patients with immunoglobulin amyloid light-chain (AL) amyloidosis. However, there exist little data regarding Asian patients receiving ASCT. We retrospectively analyzed 24 patients who were treated with ASCT for AL amyloidosis between 2007 and 2012. The median age at the time of ASCT was 56 years (range: 40-62 years), and in 63% of patients, the AL amyloidosis involved two or more organs. All patients except one received induction treatment such as cyclophosphamide, dexamethasone or thalidomide before ASCT, but only approximately half of these patients showed a hematologic response. After ASCT, the overall hematologic response was increased to 92% (22/24), which translated into increased organ response in 58% of patients (14/24). There was no transplantation-related mortality (0%) even though cardiac amyloidosis patients were included in our series. In conclusion, our results of ASCT in patients with AL amyloidosis were comparable to that of Western countries in terms of response and survival outcomes. Therefore, ASCT is an effective and feasible treatment approach for Asian patients with AL amyloidosis.</P>
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Kihyun Kim,Choi, Seong-Woo,Park, Jung Ock,Kim, Sung-Kon,Lim, Min-Young,Kim, Ki-Hyun,Ko, Taeyun,Lee, Jong-Chan Elsevier 2017 Journal of membrane science Vol.536 No.-
<P><B>Abstract</B></P> <P>Proton conductive porous substrates consisting of cross-linked benzoxazine-benzimidazole copolymers are developed for practical application of reinforced pore-filling membranes in polymer electrolyte membrane fuel cells operating at high-temperatures (>100°C) and low relative humidity (<50% RH) conditions. The porous proton conductive substrates are prepared by casting solution mixtures of sodium 3-(4-sulfonatophenyl-3,4-dihydro-2<I>H</I>-1,3 benzoxazine-6-sulfonate (<I>p</I>S) and poly[2,2′-(<I>m</I>-<I>p</I>henylene-5,5′-bibenzimidazole] (PBI) with dibutyl phthalate (DBP) as a porogen, followed by subsequent stepwise heating to 220°C and extraction of DBP from the P(<I>p</I>S-<I>co</I>-BI) films. The resulting porous substrates are found to have mechanically robust cross-linked structures, tunable hydrophilicity, and proton conductivity. A pore-filling membrane is prepared by impregnating the porous substrate with sulfonated poly(arylene ether sulfone) having the degree of sulfonation of 70mol%. The pore-filling membrane exhibits much improved dimensional stability and mechanical strength compared to the linear sulfonated poly(arylene ether sulfone) membrane and its proton conductivity and cell performance are found to be superior to the pore-filling membrane prepared using the porous substrate based on cross-linked benzoxazine-benzimidazole copolymers without any proton conductive acid groups.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Proton conductive benzoxazine having sulfonic acid groups was synthesized. </LI> <LI> Porous cross-linked benzoxazine-benzimidazole copolymer substrates were prepared. </LI> <LI> Tunable hydrophilicity, porosity and proton conductivity of porous substrates. </LI> <LI> Excellent physical stability and mechanical strength of pore-filling membrane. </LI> <LI> Outstanding cell performance of MEA prepared with the pore-filling membrane. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Longitudinal Impact of Depression on Quality of Life in Stroke Patients
EunSong Kim,JuWan Kim,HeeJu Kang,KyungYeol Bae,SungWan Kim,JoonTae Kim,ManSeok Park,KiHyun Cho,JaeMin Kim 대한신경정신의학회 2018 PSYCHIATRY INVESTIGATION Vol.15 No.2
Objective-Stroke is associated with significant long-term morbidity and poor quality of life (QOL). Depression is one of the most common complications after stroke and has been associated with QOL cross-sectionally. We investigated the longitudinal impact of depression in the acute phase of stroke on QOL 1 year after stroke. Methods-In total, 423 patients were evaluated 2 weeks after stroke, and 288 (68%) were followed 1 year later. QOL was assessed using the World Health Organization Quality of Life-Abbreviated form (WHOQOL-BREF) at baseline and follow-up. Depression was diagnosed according to Diagnostic and Statistical Manual of Mental Disorders-IV criteria; demographic and clinical characteristics data, including stroke severity, were obtained at baseline. The longitudinal associations of post-stroke depression (PSD) at baseline with QOL across two evaluation points were assessed using a repeated-measures analysis of variance. Results-The WHOQOL-BREF scores were significantly and persistently lower 1 year after stroke in patients with PSD at baseline compared with those without PSD at baseline independent of demographic and clinical characteristics, including stroke severity. Conclusion-PSD in the acute phase of stroke is an independent predictor of QOL in both the acute and chronic phases of stroke. Our findings underscore the importance of evaluating depression in the acute phase of stroke.
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Cho, Seongeun,Kim, Youngjun,Kim, Minkyoing,Kim, Jin-A.,Kim, Kihyun,Park, Yujin,Han, Soojin,Han, Chang-Yeol,Kim, Jong-Hoon,Hwang, Jun Yeon,Park, Jun-Young,Kim, Eugene,Yang, Heesun,Park, Byoungnam Elsevier 2017 Solar energy materials and solar cells Vol.164 No.-
<P><B>Abstract</B></P> <P>We demonstrate that, through formation of Zn<SUB>1−x</SUB>Mg<SUB>x</SUB>O nanocrystal solid solution (NCSS) coupled with lead sulfide (PbS) nanocrystal (NC) of different size, optoelectronic properties of a donor-acceptor energy harvesting assembly can be probed and tuned. In the ITO/PEDOT:PSS/PbS/Zn<SUB>1−x</SUB>Mg<SUB>x</SUB>O/Al arrangement as a photovoltaic test probe, simultaneous tuning of Zn<SUB>1−x</SUB>Mg<SUB>x</SUB>O NC solid solution (NCSS) and PbS NC in a narrow range in the energy levels is achieved altering the open circuit voltage and the short circuit current as measures of donor/acceptor interfacial electronic properties. With the Mg composition increasing, the energy band gap of the Zn<SUB>1−x</SUB>Mg<SUB>x</SUB>O NCSS (acceptor) increases with its conduction band edge becoming closer to the lowest occupied molecular orbital level of the PbS NC (donor), increasing splitting of quasi-Fermi energy levels in the electron donor/acceptor assembly under illumination. More amount of Mg in the NCSS leads to transition from an energy level limited regime to a trap-induced charge transport limited regime, evidenced by a simultaneous decrease in the open circuit voltage and the short circuit current. This new finding provides insights of trade-off between the energy level off-set and the trap-induced charge transport degradation in engineering interfacial charge transfer and transport via formation of NCSS in integrating modern electronic devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Simultaneous tuning of Zn<SUB>1−x</SUB>Mg<SUB>x</SUB>O NCSS and PbS NC in a narrow range is achieved. </LI> <LI> Formation of NCSS at a very narrow range has a dramatic effect on the interfacial properties. </LI> <LI> Subtle amount of doping in the NCSS leads to transition from an energy level limited to a transport limited regime. </LI> </UL> </P>
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Han, Jusung,Kim, Kihyun,Kim, Junghwan,Kim, Sungjun,Choi, So-Won,Lee, Hyunhee,Kim, Jin-joo,Kim, Tae-Ho,Sung, Yung-Eun,Lee, Jong-Chan Elsevier 2019 Journal of membrane science Vol.579 No.-
<P><B>Abstract</B></P> <P>End-group cross-linked sulfonated poly(arylene ether sulfone) (SPAES) membranes were prepared using thiol capped SPAES (SH-SPAES) with different amounts of vinyl polysulfone (VPSf) as a polymeric cross-linker. The cross-linked membranes showed remarkably improved physicochemical stabilities compared to the corresponding linear SPAES membrane. Although the proton conductivity of the SPAES membrane composed of SPAES with the degree of sulfonation (DS) as 70 mol% could not be measured due to its low physical stability under the measurement condition, those of the cross-linked membranes were repeatedly evaluated due to the enhanced stability through the formation of cross-linked structures. The obtained proton conductivity values from cross-linked membranes are larger than those of the linear SPAES membrane which composed of SPAES with DS of 50 mol% having the ion exchange capacity (IEC) similar to that of the cross-linked membranes, especially at relative low humidity conditions. Furthermore, the fuel cell performance of the membrane electrode assembly (MEA) prepared with the cross-linked membrane, showing the optimized physicochemical stabilities and proton conductivity exhibited a maximum power density of 692 mW cm<SUP>−2</SUP>, which was larger than that with Nafion 212 (603 mW cm<SUP>−2</SUP>) at 80 °C under fully humidified H<SUB>2</SUB>/Air condition.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Thiol group capped highly sulfonated poly(arylene ether sulfone) and vinyl group containing poly sulfone were synthesized. </LI> <LI> End group cross-linked membranes were prepared by thiol-ene click reaction using polymeric cross-linker. </LI> <LI> Excellent physicochemical stability of end group cross-linked membranes. </LI> <LI> High proton conductivity of end group cross-linked membranes in low humidity condition. </LI> <LI> Outstanding cell performance of MEA prepared with end group cross-linked membrane. </LI> </UL> </P>
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