http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Electrical Characterization of Ultrathin Film Electrolytes for Micro-SOFCs
Shin, Eui-Chol,Ahn, Pyung-An,Jo, Jung-Mo,Noh, Ho-Sung,Hwang, Jaeyeon,Lee, Jong-Ho,Son, Ji-Won,Lee, Jong-Sook The Korean Ceramic Society 2012 한국세라믹학회지 Vol.49 No.5
The reliability of solid oxide fuel cells (SOFCs) particularly depends on the high quality of solid oxide electrolytes. The application of thinner electrolytes and multi electrolyte layers requires a more reliable characterization method. Most of the investigations on thin film solid electrolytes have been made for the parallel transport along the interface, which is not however directly related to the fuel cell performance of those electrolytes. In this work an array of ion-blocking metallic Ti/Au microelectrodes with about a $160{\mu}m$ diameter was applied on top of an ultrathin ($1{\mu}m$) yttria-stabilized-zirconia/gadolinium-doped-ceria (YSZ/GDC) heterolayer solid electrolyte in a micro-SOFC prepared by PLD as well as an 8-${\mu}m$ thick YSZ layer by screen printing, to study the transport characteristics in the perpendicular direction relevant for fuel cell operation. While the capacitance variation in the electrode area supported the working principle of the measurement technique, other local variations could be related to the quality of the electrolyte layers and deposited electrode points. While the small electrode size and low temperature measurements increaseed the electrolyte resistances enough for the reliable estimation, the impedance spectra appeared to consist of only a large electrode polarization. Modulus representation distinguished two high frequency responses with resistance magnitude differing by orders of magnitude, which can be ascribed to the gadolinium-doped ceria buffer electrolyte layer with a 200 nm thickness and yttria-stabilized zirconia layer of about $1{\mu}m$. The major impedance response was attributed to the resistance due to electron hole conduction in GDC due to the ion-blocking top electrodes with activation energy of 0.7 eV. The respective conductivity values were obtained by model analysis using empirical Havriliak-Negami elements and by temperature adjustments with respect to the conductivity of the YSZ layers.
Synthesis and electroluminescent properties of new conjugated bithiazole-containing polymers.
Shin, Chol-Min,Kim, Myeong-Jong,Park, Jong-Wook,Kim, Sung-Ryong,Min, Byung-Gak,Chung, Min-Chul,Lee, Ji-Hoon American Scientific Publishers 2008 Journal of Nanoscience and Nanotechnology Vol.8 No.10
<P>Three new bithiazole-based conjugated copolymers were synthesized and characterized. The EL device using PNBTV as the emitting layer showed red electroluminescence at 641 nm with a peak luminance of ca. 160 cd/m2 (0.008 cd/A). The red electroluminescence was attributed to the formation of excimers between the polymer chains. An EL device using PNBTV6 as the emitting material, which had two n-hexyl groups introduced to the phenylene in the main chain of PNBTV, showed a reddish orange emission that was blue shifted by approximately 52 nm compared with that observed with PNBTV. This observation was attributed to the significant decrease in interactions between the chains of the polymers due to the two bulky n-hexyl groups. On the other hand, PNBTV6 was found to have superior hole transporting ability compared with its electron transporting ability.</P>
Effect of Hispidulin 7-O-neohesperidoside on Lipid Peroxidation in Rat Liver and NMR Assignment
Park, Jong-Cheol,Baek, Nam-In,Chung, Shin-Kyo,Hur, Jong-Moon,Lee, Jong-Ho,Yu, Young-Beob,Chol, Jong-Won The Korean Society of Pharmacognosy 1997 생약학회지 Vol.28 No.2
The full NMR assignment of hispidulin 7-0-neohesperidoside (1) isolated from Cirsium japonicum var. ussuriense was made with the aid of 2D correlation NMR techniques such as HMQC and HMBC. To investigate detoxification of bromobenzene-induced hepatic lipid peroxidation by compound 1, hepatic lipid peroxide level and the activities of enzymes responsible for production and removal of epoxide were studied. The level of lipid peroxide elevated by bromobenzene was significantly reduced by compound 1. This compound administered daily over one week before intoxication with bromobenzene did not affect the activities of aminopyrine N-demethylase, aniline hydroxylase, glutathione S-transferase. Epoxide hydrolase activity was decreased significantly by bromobenzene, which was restored to the control level by pretreatment of persicarin. The results suggest that the bromobenzene-induced hepatic lipid peroxidation by compound 1 is reduced by enhancing the activity of epoxide hydrolase, an enzyme removing bromobenzene epoxide.
Shin, Jae-Wook,Kim, Jong-Sik,Kim, Seung-Soo,Shin, Hyun-Chol The Institute of Electronics and Information Engin 2007 Journal of semiconductor technology and science Vol.7 No.4
A fractional-N frequency synthesizer supports quadruple bands and multiple standards for mobile broadcasting systems. A novel linearized coarse tuned VCO adopting a pseudo-exponential capacitor bank structure is proposed to cover the wide bandwidth of 65%. The proposed technique successfully reduces the variations of KVCO and per-code frequency step by 3.2 and 2.7 times, respectively. For the divider and prescaler circuits, TSPC (true single-phase clock) logic is extensively utilized for high speed operation, low power consumption, and small silicon area. Implemented in $0.18-{\mu}m$ CMOS, the PLL covers $154{\sim}303$ MHz (VHF-III), $462{\sim}911$ MHz (UHF), and $1441{\sim}1887$ MHz (L1, L2) with two VCO's while dissipating 23 mA from 1.8 V supply. The integrated phase noise is 0.598 and 0.812 degree for the integer-N and fractional-N modes, respectively, at 750 MHz output frequency. The in-band noise at 10 kHz offset is -96 dBc/Hz for the integer-N mode and degraded only by 3 dB for the fractional-N mode.
The Cellular Response to Graphene Oxide and Its Related Nano-derivatives
( Jong Wook Shin ),( Chang Seok Park ),( Jae Kook Nam ),( Young Ae Baik ),( Jae Woo Jung ),( Jae Chol Choi ),( Jae Yeol Kim ),( In Won Park ),( Byoung Whui Choi ),( Kyung Soon Choi ),( Juhyun Park ),( 대한결핵 및 호흡기학회 2012 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.114 No.0
The graphene which is an allotrope of carbon has the honeycombing structure of one-atom-thick planar sheets. it is used in modern electronic, informative technologies sensors and drug delivery system. Graphene oxide (GO) has oxygen functional groups on the graphene plane. We performed this experiment to define the cellular effect of GO. GO was prepared by the modified Hummers method using 2 g of graphite powder. After sequential procedure, GO in water was used for experiment. U-937, Raw264.7 cells and A549 cells were cultivated with GO and related nanoparticles. We checked the microscopic charac-teristics, MTT assay and Western blotting. The X-ray diffraction patterns showed that the pristine graphite had a peak centered at 2θ=26.5o (d=0.33 nm). This peak was shifted to 2θ=11.3o (d=0.78 nm) after applying the Hummers method. U937 cells aggregated sround GO. During 48 hours, modified GO with methyl group (DA-GO) and SDS-hydrazine GO(SDS-HYDrGO) diminished A549 proliferation than GO. In contrast, GO inhibited proliferation of Raw264.7 cells than DA-GO and SDS-HYD rGO. The shifting from LC3B-I to LC3B-II was minimal in GO, DA-GO, SDS-HYD rGO. In conclusion, GO in water may be phagocytosed by mononuclear cells. GO and its ligand-modified derivatives may affect differentially on proliferation or survival in airway epithelial cells and mononuclear cells. Acknowledgement: This research was supported by Mid-career Research Program (2011-0028752) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology.
A Case of IgG4-Related Disease Presenting as Massive Pleural Effusion and Thrombophlebitis
( Jong Hyun Choi ),( Jae Kyeom Sim ),( Jee Youn Oh ),( Eun Joo Lee ),( Gyu Young Hur ),( Seung Heon Lee ),( Sung Yong Lee ),( Je Hyeong Kim ),( Sang Yeub Lee ),( Chol Shin ),( Jae Jeong Shim ),( Kwang 대한결핵 및 호흡기학회 2014 Tuberculosis and Respiratory Diseases Vol.76 No.4
Immunoglobulin (Ig) G4-related disease is a recently recognized systemic fibroinflammatory condition characterized by a lymphoplasmacytic infiltrate rich in IgG4-positive plasma cells with elevated circulating levels of IgG4. The disease can either be localized to one or two organs, or present as diffuse multi-organ disease. Furthermore, lesions in different organs can present simultaneously or metachronously. In the pulmonary manefestations, lesions associated with IgG4-related disease have been described in the lung parenchyma, airways and pleura, as well as the mediastinum. We report a case of IgG4-related disease presenting as massive pleural effusion and thrombophlebitis.
Shin, Eui-Chol,Ahn, Pyung-An,Seo, Hyun-Ho,Lee, Jong-Sook The Korean Ceramic Society 2016 한국세라믹학회지 Vol.53 No.5
Electrolyte-supported symmetric Ni-YSZ cermet electrodes of ca. $23{\mu}m$ were prepared by screenprinting and the impedance was measured as a function of humidity from 2% to 90% balanced in $H_2$ at a total flow rate of 50 sccm. The Ni felt current collector of 1 mm thickness exhibited a Gerischer-like gas concentration impedance in the low frequency range, which was similarly observed in the cermet-supported solid oxide cells, while the Pt paste collector exhibited only electrochemical polarization. The electrochemical polarization of both samples was modeled by a non-ideal diffusion-reaction transmission line model including CPEs with ${\alpha}$= 0.5. In the case of the Pt paste collector, all the Bisquert parameters exhibited humidity dependence to the -1/2 power, supporting a non-faradaic chemical reaction mechanism at three phase boundaries. Consequently, the surface diffusivity and reaction rate increased linearly with humidity. Less pronounced humidity dependence and somewhat lower utilization length with an Ni felt collector can be attributed to the diffusion-limited gas flow through the collector.
A Case Report: Solitary IgG4 Related Sclerosing Disease in the Lung
( Jong Wook Shin ),( Min Se Lee ),( Ju Young Jang ),( Bo Min Kim ),( Jae Woo Jung ),( Jae Chol Choi ),( Jae Yeol Kim ),( In Won Park ),( Byoung Whui Choi ) 대한결핵 및 호흡기학회 2012 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.114 No.0
The IgG4 related sclerosing disease is defined as a dense IgG4+ lymphoplasmocytic tumefactive fibroinflammation and aller-gic disease (atopy, eczema, asthma, modest peripheral eosinophilia) which involves virtually any systemic organs in human being. This disease may be contributed by half antibody exchange reaction/fragment antigen-binding (Fab)-arm exchange reaction. It is composed of serum IgG4+ increase, IgG4+ plasma cells, storiform fibrosis and inflammatory pseudotumor and modified Th2 response (IL-4, -13; IL-10, -12, -21). This disease is also known to be related with subsequent neoplasm. A fifty year-old woman complained of acute onset of fever, cough and sputum. The radiologic findings showed total consolidation in the right lower lobe. This lesion was not slowly responsive to antibiotics. The pathologic findings were lymphocytic infiltra-tion, which were stained positively with IgG4. After steroid therapy, this lesion became markedly resoluted but further fol-low-up would be mandatory.