http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Dielectric and Pyroelectric Properties of Dy-doped BSCT Thick Films by Screen-printing Method
Hyun-Ji Noh,Sung-Gap Lee,Sung-Pill Nam 대한전기학회 2009 Journal of Electrical Engineering & Technology Vol.4 No.4
(Ba0.57Sr0.33Ca0.10)TiO₃ (=BSCT) powders, prepared by the sol-gel method, were doped using MnCO₃ as the acceptor and Dy₂O₃ as the donor. This powder was mixed with an organic vehicle. BSCT thick films were fabricated by the screen-printing techniques on the alumina substrate. The structural and dielectric properties of BSCT thick films were investigated with variation of the Dy₂O₃ amount. As a result of the differential thermal analysis (DTA), the exothermic peak was observed at around 670℃ due to the formation of the polycrystalline perovskite phase. All the BSCT thick films showed the XRD patterns of a typical polycrystalline perovskite structure. The average grain size of BSCT thick films decreased with an increasing amount of Dy₂O₃. The relative dielectric constant and dielectric loss of the BSCT thick film doped Dy₂O₃ 0.1㏖% were 4637.4 and 1.6% at 1㎑, respectively.
O-GlcNAc Modification on E-cadherin repressor Snail confers Epithelial-Mesenchymal Transition
Sang Yoon Park,Hyun Sil Kim,Nam Hee Kim,Won Ho Yang,Jeong Gu Kang,Suena Ji,Shi Eun Kang,Ichiro Ota,Keiji Shimada,Noboru Konishi,Mi Heon Ryu,Hyung Wook Nam,Jong In Yook,Jin Won Cho 한국당과학회 2009 한국당과학회 학술대회 Vol.2009 No.1
The transcriptional repressor Snail plays a key role in epithelial-mesenchymal transition (EMT) by which direct repression of E-cadherin transcription. Therefore, regulation of Snail expression level in epithelial tumor cells is important not only for maintaining of epithelial homeostasis, but also for invasion and metastasis of cancer cells by the EMT program. Series of Ser imbedded in Snail are phosphorylated by GSK3 and Snail expression is dynamically regulated by Wnt signaling together with β-catenin while driving a Snail-dependent EMT program. Glucose flux through the hexosamine biosynthetic pathway (HBP) can be used for the source of O-linked β-N-acetylglucosamine(O-GlcNAc) modification on Ser and Thr residues of various nucleocytoplasmic proteins. In this study, we demonstrate that Ser112 of Snail is O-GlcNAcylated and this adjacent-site occupancy inhibits phosphorylation by GSK-3, resulting in increased Snail stability and attenuation of E-cadherin proximal promoter activity and transcription level. Furthermore, Overexpression of OGT induces in vivo invasion program of epithelial cancer cells by Snail-dependent manner. Taken together, our results indicate dynamic interplay between O-GlcNAcylation and GSK-3 phosphorylation of Snail, and our observations may provide the molecular insight of pathogenic and prognostic correlation between cancer progression and hyperglycemic condition of diabetes.
Sang-Hyun Oh,Eui-Seong Hwang,Eun-Seok Choi,Gyu-Dong Park,Jin-Gu Kim,Jin-Yong Seong,Jun-Hee Cho,Keun-Do Ban,Keun-Hwan Noh,Nam-Kyeong Kim,Seaung-Suk Lee,Seok-Won Lee,Seung-Jin Yeom,Soon-Yong Kweon,Suk-K 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
We have investigated the ferroelectric properties of integrated Pt/SrBi2Ta2O9 (SBT)/Pt capacitors with capacitor-level dielectric of boron phosphosilicate glass (BPSG). A signicant reduction of remanent polarization (P-P^) was observed in the SBT capacitor as covered with BPSG lm and the polarization decay depended strongly on top electorde size. Detailed analyses showed the degradation resulted from bismuth loss in the surface region of SBT, which is closely related with the impurites diused from BPSG into SBT layer. The degradation of Pt/SBT/Pt ferroelectric capacitor was successfully prevented by inserting SiO2 layer as a impurity blocking layer between the SBT and the BPSG. Thereby device performances of SBT-based ferroelectric memory were also considerably improved.
Hyun-Soo Lee,Dong Yun Jung,Youngrak Park,Jeho Na,Hyun-Gyu Jang,Hyoung-Seok Lee,Chi-Hoon Jun,Junbo Park,Sang-Ouk Ryu,Sang Choon Ko,Eun Soo Nam IEEE 2015 IEEE electron device letters Vol.36 No.11
<P>A large GaN-Schottky barrier diode (SBD) with a recessed dual anode metal is proposed to achieve improved the forward characteristics without a degradation of the reverse performances. Using optimized dry etch condition for a large device, the electrical characteristics of the device are demonstrated when applying the recessed dual anode metal and changing the recess depths. The device size and channel width are 4 mm(2) and 63 mm, respectively. The 16-nm recessed dual anode metal SBD has a turn-ON voltage of 0.34 V, a breakdown voltage of 802 V, and a reverse leakage current of 1.82 mu A/mm at -15 V. The packaged SBD exhibits a forward current of 6.2 A at 2 V and a reverse recovery charge of 11.54 nC.</P>
A Convertible Plasma Torch System for Efficient Melting of Non-Metallic Waste
Nam-Ki Lee,Dong-Hyun Lee,Hae-Won Park,Sang-Yun Paek,Hyo-Jeong Kim,Jun-Ho Seo 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
Normally, non-metallic wastes, such as sands, concrete and asbestos are regarded as electrically non-conductive materials. However, when the temperatures are increased up to the melting point, their electrical conductivities can be greatly improved, flowing arc current. Accordingly, these nonmetallic wastes can be efficiently treated by heating them up to the electrically conducting temperatures by using a non-transferred type plasma torch, and then, melting them completely with arc currents in transferred mode of plasma torch. For this purpose, we propose a convertible plasma torch consisting of three cylindrical electrodes (rear electrode, front electrode and exit nozzle). Compared with conventional plasma torch with two cylindrical electrodes (rear electrode and front electrode), the proposed plasma torch can provide more stable plasma jet in high powered and non-transferred mode due to the presence of exit nozzle, resulting in rapid heating of the non-conductive materials.