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Seongjin Cho,Dongkyu Park,Taewoo Kwon,Dongsun Yoo,Ilgon Kim 한국진공학회(ASCT) 2002 Journal of Korean Vacuum Science & Technology Vol.6 No.1
Polymer EL devices of glass/ITO/PI/MEH-PPV/Al structure were fabricated using spin coating and the Ionized Cluster Beam deposition technique. PMDA-ODA type thin polyimide films which can be used as a impurity blocking layer of EL device were deposited by ICB. According to our previous results, the packing densities of polyimide films were subject to change and depend on their deposition condition. By inserting a Pl layer with various thickness and packing density, I-V characteristics and life time of the devices were investigated to determine the role of a interlayer. The blocking of impurity diffusion from ITO to luminescent layer were confirmed by XPS.
The effect of Ion Beam modification of Polyimide surface on alignment properties of liquid crystals
Seong Jin Cho,Chan Soo Kim,Jin A Roh,Jin Seog Gwag,Jae Chang Kim 한국진공학회(ASCT) 2003 Applied Science and Convergence Technology Vol.12 No.S1
The alignment effect of liquid crystals on Polyimide surfaces bombarded by a low energy argon ion beam and the effect of pretilt angle on viewing characteristics of an LCD cell are discussed. The unidirectional out-of-plane liquid crystal tilt angle is varied with various ion beam irradiation conditions, such as the energy of the incident ions, the angle of incidence and exposure time. As low pretilt angle is profitable for wider viewing property, LCD cell with ion beam modified Polyimide layer show wider viewing characteristics.
A Single-Ended ADC with Split Dual-Capacitive-Array for Multi-Channel Systems
Seong-Jin Cho,Ju Eon Kim,Dong Ho Shin,Dong-Hyun Yoon,Dong-Kyu Jung,Hong Tae Jeon,Seok Lee,Kwang-Hyun Baek 대한전자공학회 2015 Journal of semiconductor technology and science Vol.15 No.5
This paper presents a power and area efficient SAR ADC for multi-channel near thresholdvoltage (NTV) applications such as neural recording systems. This work proposes a split dual-capacitivearray (S-DCA) structure with shifted input range for ultra low-switching energy and architecture of multichannel single-ended SAR ADC which employs only one comparator. In addition, the proposed ADC has the same amount of equivalent capacitance at two comparator inputs, which minimizes the kickback noise. Compared with conventional SAR ADC, this work reduces the total capacitance and switching energy by 84.8% and 91.3%, respectively.
Seong-Jin Cho,Jeong-Hwan Song Materials Research Society of Korea 2024 한국재료학회지 Vol.34 No.4
In this study, NASICON-type Li<sub>1+X</sub>Ga<sub>X</sub>Ti<sub>2-X</sub>(PO<sub>4</sub>)<sub>3</sub> (x = 0.1, 0.3 and 0.4) solid-state electrolytes for all-solid-state batteries were synthesized through the sol-gel method. In addition, the influence on the ion conductivity of solid-state electrolytes when partially substituted for Ti<sup>4+</sup> (0.61Å) site to Ga<sup>3+</sup> (0.62Å) of trivalent cations was investigated. The obtained precursor was heat treated at 450 ℃, and a single crystalline phase of Li<sub>1+X</sub>Ga<sub>X</sub>Ti<sub>2-X</sub>(PO<sub>4</sub>)<sub>3</sub> systems was obtained at a calcination temperature above 650 ℃. Additionally, the calcinated powders were pelletized and sintered at temperatures from 800 ℃ to 1,000 ℃ at 100 ℃ intervals. The synthesized powder and sintered bodies of Li<sub>1+X</sub>Ga<sub>X</sub>Ti<sub>2-X</sub>(PO<sub>4</sub>)<sub>3</sub> were characterized using TG-DTA, XRD, XPS and FE-SEM. The ionic conduction properties as solid-state electrolytes were investigated by AC impedance. As a result, Li<sub>1+X</sub>Ga<sub>X</sub>Ti<sub>2-X</sub>(PO<sub>4</sub>)<sub>3</sub> was successfully produced in all cases. However, a GaPO<sub>4</sub> impurity was formed due to the high sintering temperatures and high Ga content. The crystallinity of Li<sub>1+X</sub>Ga<sub>X</sub>Ti<sub>2-X</sub>(PO<sub>4</sub>)<sub>3</sub> increased with the sintering temperature as evidenced by FE-SEM observations, which demonstrated that the edges of the larger cube-shaped grains become sharper with increases in the sintering temperature. In samples with high sintering temperatures at 1,000 ℃ and high Ga content above 0.3, coarsening of grains occurred. This resulted in the formation of many grain boundaries, leading to low sinterability. These two factors, the impurity and grain boundary, have an enormous impact on the properties of Li<sub>1+X</sub>Ga<sub>X</sub>Ti<sub>2-X</sub>(PO<sub>4</sub>)<sub>3</sub>. The Li<sub>1.3</sub>Ga<sub>0.3</sub>Ti<sub>1.7</sub>(PO<sub>4</sub>)<sub>3</sub> pellet sintered at 900 ℃ was denser than those sintered at other conditions, showing the highest total ion conductivity of 7.66 × 10<sup>-5</sup> S/cm at room temperature. The total activation energy of Li-ion transport for the Li<sub>1.3</sub>Ga<sub>0.3</sub>Ti<sub>1.7</sub>(PO<sub>4</sub>)<sub>3</sub> solid-state electrolyte was estimated to be as low as 0.36 eV. Although the Li<sub>1+X</sub>Ga<sub>X</sub>Ti<sub>2-X</sub>(PO<sub>4</sub>)<sub>3</sub> sintered at 1,000 ℃ had a relatively high apparent density, it had less total ionic conductivity due to an increase in the grain-boundary resistance with coarse grains.
Imaging Findings of Castleman’s Disease Localized in the Axilla:A Case Report
서보경,오유환,KyuRanCho,NamJoonLee,JungHyukKim,김인선,SeongJinCho,JeoungWonBae 대한영상의학회 2002 Korean Journal of Radiology Vol.3 No.2
Castleman's disease is a rare benign lymphoproliferative disorder of uncertain origin which most commonly involves the mediastinum but rarely affects the axilla. We report a case of localized Castleman's disease involving the axillary lymph node. Mammography revealed a well-defined, homogeneously dense ovoid mass, 3 cm in size, in the left axilla, while gray-scale ultrasonography (US) demonstrated a well-defined, uniformly hypoechoic ovoid mass with good through transmission. Peripheral hypervascularity was observed at power Dopper US, and early rapid homogeneous enhancement at contrast-enhanced dynamic CT.