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Freely Deformable Liquid Metal Grids as Stretchable and Transparent Electrodes
Moon, Yu Gyeong,Koo, Jae Bon,Park, Nae-Man,Oh, Ji-Young,Na, Bock Soon,Lee, Sang Seok,Ahn, Seong-Deok,Park, Chan Woo Institute of Electrical and Electronics Engineers 2017 IEEE transactions on electron devices Vol.64 No.12
<P>A new structure of stretchable and transparent metal-grid electrodes is described, where a liquid metal alloy, eutectic gallium–indium (EGaIn) is employed as a stretchable conducting material. By a “roll-painting and lift-off” technique based on photolithography, stretchable EGaIn-grids with the linewidth of 20 <TEX>$\mu \text{m}$</TEX> and the line pitch of 400–1000 <TEX>$\mu \text{m}$</TEX> are produced, providing the transmittance of 75%–88% with the sheet resistance less than 2.3 <TEX>$\Omega $</TEX>/square. Powered by the freely deformable nature of the liquid phase conductor, the EGaIn-grid provides stable conductivity under highly stretched condition up to 40%, as well as high reliability against cyclic deformation. By combining the EGaIn-grid with a homogeneous and transparent poly(3,4-thylenedioxythiophene):poly(styrensulfonate) (PEDOT:PSS) layer in a hybrid manner, we can construct highly stretchable and uniformly conducting transparent electrodes. The hybrid PEDOT:PSS/EGaIn-grid electrodes can be utilized as electrodes for a stretchable inorganic electroluminescence device with a ZnS phosphor-elastomer composite as the emission layer, which maintains uniform and stable emission under highly and repeatedly stretched conditions.</P>
Expression of Developmentally Regulated Promoter of Alkali-tolerant Bacillus sp. Ya-14
Park, Young Seo,Koo, Bon Tag,Kim, Jin Man,Park, Hee Kyoung,Yu, Ju Hyun 한국산업미생물학회 1990 한국미생물·생명공학회지 Vol.18 No.4
알카리 내성 Bacillus sp. YA-14의 chromosomal DNA로부터 유래된 promoter를 subcloning하여 그 생화학적 특성과 포자형성과의 관계를 조사하였다. 알카리 내성 Bacillus sp.와 B. subtilis에서 promoter의 활성은 포자가 형성되기 시작하는 단계에서 증가하기 시작했다. 또한 배지내 glucose가 1.0%(w/v) 첨가시 promoter 활성이 억제되었다. 5가지의 spoO 유전자 중에서 3가지 유전자(spoOB, spoOH, spoOJ) 산물이 promoter 활성에 필요하였다. The promoter isolated from chromosomal DNA of an alkali-tolerant Bacillus sp. YA-14 was subcloned and biochemically characterized. Also the relationships between the promoter activity and sporulation were investigated. In alkali-tolerant Bacillus sp. and Bacillus subtilis, the activity of promoter began to increase at the onset of sporulation with the same mode, and repressed in the presence of 1.0%(w/v) glucose. Among five spoO genes, three spoO genes (spoOB, spoH, spoOJ) were required for promoter expression.
Park, Chan Woo,Moon, Yu Gyeong,Seong, Hyejeong,Jung, Soon Won,Oh, Ji-Young,Na, Bock Soon,Park, Nae-Man,Lee, Sang Seok,Im, Sung Gap,Koo, Jae Bon American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.24
<P>We demonstrate a new patterning technique for gallium-based liquid metals on flat substrates, which can provide both high pattern resolution (similar to 20 mu m) and alignment precision as required for highly integrated circuits. In a very similar manner as in the patterning of solid metal films by photolithography and lift-off processes, the liquid metal layer painted over the whole substrate area can be selectively removed by dissolving the underlying photoresist layer, leaving behind robust liquid patterns as defined by the photolithography. This quick and simple method makes it possible to integrate fine-scale interconnects with preformed devices precisely, which is indispensable for realizing monolithically integrated stretchable circuits. As a way for constructing stretchable integrated circuits, we propose a hybrid configuration composed of rigid device regions and liquid interconnects, which is constructed on a rigid substrate first but highly stretchable after being transferred onto an elastomeric substrate. This new method can be useful in various applications requiring both high-resolution and precisely aligned patterning of gallium-based liquid metals.</P>
NiO 촉매의 분산성 및 안정성 향상을 위하여 FeCrAl 합금 폼 위에 성장된 Al<sub>2</sub>O<sub>3</sub> Inter-Layer 효과
이유진,구본율,백성호,박만호,안효진,Lee, Yu-Jin,Koo, Bon-Ryul,Baek, Seong-Ho,Park, Man-Ho,Ahn, Hyo-Jin 한국재료학회 2015 한국재료학회지 Vol.25 No.8
NiO catalysts/$Al_2O_3$/FeCrAl alloy foam for hydrogen production was prepared using atomic layer deposition (ALD) and subsequent dip-coating methods. FeCrAl alloy foam and $Al_2O_3$ inter-layer were used as catalyst supports. To improve the dispersion and stability of NiO catalysts, an $Al_2O_3$ inter-layer was introduced and their thickness was systematically controlled to 0, 20, 50 and 80 nm using an ALD technique. The structural, chemical bonding and morphological properties (including dispersion) of the NiO catalysts/$Al_2O_3$/FeCrAl alloy foam were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy and scanning electron microscopy-energy dispersive spectroscopy. In particular, to evaluate the stability of the NiO catalysts grown on $Al_2O_3$/FeCrAl alloy foam, chronoamperometry tests were performed and then the ingredient amounts of electrolytes were analyzed via inductively coupled plasma spectrometer. We found that the introduction of $Al_2O_3$ inter-layer improved the dispersion and stability of the NiO catalysts on the supports. Thus, when an $Al_2O_3$ inter-layer with a 80 nm thickness was grown between the FeCrAl alloy foam and the NiO catalysts, it indicated improved dispersion and stability of the NiO catalysts compared to the other samples. The performance improvement can be explained by optimum thickness of $Al_2O_3$ inter-layer resulting from the role of a passivation layer.
만성 골수성 백형병에 있어서 Busulfan 과 Hydroxyurea 의 치료 효과의 비교
이규보,황기석,류만준,구본환 대한내과학회 1986 대한내과학회지 Vol.31 No.4
A retrospective analysis of 27 patients with chronic myelogenous leukemia treated with busulfan(20 patients) and hydroxyurea(7 patients) was done in order to compare .the effectiveness of each therapeutic modality. In the busulfan-treated group the white blood cell count decreased to normal in all the patients, anemia improved in 88.9%, and splenomegaly decreased or disappeared in 85.0%. In the hydroxyurea-treated group, the decrease of white blood cell count to normal, correction of anemia, and disappearance of splenomegaly were observed in all the patients treated. The order of recovery in the busulfan-treated group was the normalization of the white blood cell count, correction of anemia, and disappearance of splenomegaly, while the hydroxyureatreated group showed the normalization of white blood cell count, disappearance of splenomegaly, and correction of anemia. The treatment with hydroxyurea demonstrated a more rapid decreasing effect on the white blood cell count than did busulfan. On the other hand, the fluctuations of the white blood cell count in the hydroxyurea-treated group were so remarkable that frequent adjustments to dosage were necessary to maintain the sustained control of the cell count. The adverse effects of busulfan were skin pigmentation(100%) and pancytopenia(10%), whereas in the hydroxyurea-treated group mild nausea. and vomiting were noted in only 3cases(43%).
Na, Bock Soon,Jung, Soon-Won,Moon, Yu Gyeong,Park, Chan Woo,Park, Nae-Man,Oh, Ji-Young,Lee, Sang Seok,Koo, Jae Bon,Koo, Kyung-Wan American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.10
<P>Future stretchable electronic systems require memory devices that combine low power consumption with mechanical stretchability. We fabricated stretchable ferroelectric memory transistors (FMTs) on a polydimethylsiloxane substrate with patterned polyimide island structures by using an amorphous InGaZnO semiconductor and ferroelectric poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) gate insulator. The FMTs exhibited a field-effect mobility of 7.5 cm(2)V(-1)s(-1) and a current on/off ratio of 10(7) at a relatively low operating voltage. Furthermore, the fabricated memory transistors showed no noticeable changes in their electrical performance for large strains of up to 50%.</P>