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Experimental response function of a phtoelectron spectrometer
Moonsup Han,Hye-Yeong Shin,S.-J. Oh 한국진공학회(ASCT) 1999 Journal of Korean Vacuum Science & Technology Vol.3 No.2
We developed the experimental response function (ERF) which can be used for the numerical curve fitting analysis in photoelectron spectroscopy (PES). We selected the core-levels of Ag 3d_(5/2) and Au 4f_(7/2) to obtain the ERF because the parameters characterizing the intrinsic line-shape have been known well. Relying on the numerical fourier transformation we deconvoluted the ERF from the measured core-level spectra. For the numerical fourier transformation we applied the fast transform (FFT) algorithm. We considered optimal (Wiener) filtering with the FFT due to noise and used Hann window function to remedy the information leakage in frequency domain due to discrete and finite sampling of measurement. The comparison of the curve fitting results using the ERF obtained in this work and the mathematical response function with a gaussian in the conventional approach shows clearly the improvement of the curve fitting analysis.
Formation and stability of a ruthenium - oxide thin film made of the O₂/ Ar gas - mixture sputtering
Moonsup Han,Min-Cherl Jung,H.-D. Kim,William Jo 한국진공학회(ASCT) 2001 Journal of Korean Vacuum Science & Technology Vol.5 No.2
To obtain high remnant polarization and good crystalinity of ferroelectric thin films in non-volatile memory devices, the high temperature treatment in oxygen ambient is inevitable. Severe problems that occur in this process are oxygen diffusion into substrate, oxidation of electrode and buffer layer, degradation of microstructure and so on. We made ruthenium dioxide thin film by reactive sputtering with oxygen and argon mixture atmosphere. Comparing quantitatively the core-level spectra of Ru and RuO₂ obtained by x-ray photoelectron spectroscopy(XPS), we found that chemical state of RuO₂ is very stable and of good resistance to oxygen diffusion and oxidation of adjacent layers. It opens the use of RuO₂ thin film as a multifunctional layer of good conducting electrode and resistive barrier for the diffusion and the oxidation. We also suggest a correct understanding of Ru 3d core-level spectrum for RuO₂ based on the scheme of final state screening and charge transfer satellites.
Annealing Effects on the Photoluminescence of Amorphous Silicon-Nitride Films
Changhun Ko,Moonsup Han,Byoung Youl Park,Jiho Joo,Jung Hyun Sok,Kyoungwan Park 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6
Amorphous silicon-nitride films were deposited at low temperature (350 C) and with high deposition rates (220 . 280 °A/min) by using plasma-enhanced chemical-vapor deposition (PECVD). The optical and the structural properties of these films have been characterized by using photoluminescence (PL) and atomic force microscopy (AFM). Five broad emission peaks, one each at 3.1, 2.4, 2.15, 1.9, and 1.75 eV, were observed in the PL spectra by adjusting the flow rate of the nitrogen gas. As the nitrogen gas flow was increased, the wavelength of the emitted light shifted from blue to red in the PL spectra. After the films were annealed at 700 . 1000 C for 10 min in ultra-high vacuum (UHV) condition, the PL intensity became 4 . 10 times stronger while the positions of the PL peaks were not changed. These experimental results show that the PL of amorphous silicon nitride films is closely related to the formation of optically active defect states. According to this interpretation, we will explain the PL enhancement after the thermal annealing process.p#?
( Ji Won Han ),( Pil Soo Sung ),( Seon-hui Hong ),( Hyojin Lee ),( Moonsup Jeong ),( Su-hyung Park ),( Jian Yan ),( Amir Khan ),( Joel N. Maslow ),( David B. Weiner ),( Jeong Heo ),( Sang Hoon Ahn ),( 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1
Aims: Although direct-acting antivirals (DAA) are successfully used for the treatment of chronic hepatitis C, there are DAA-resistant cases. Furthermore, DAA-treated patients do not develop protective immunity against HCV re-infection. To complement DAA therapy, we developed a DNA vaccine (VGX- 6150) containing three plasmids encoding HCV genotype 1 NS3, NS4 and NS5A consensus immunogens and plasmid encoding IL-28B as a molecular adjuvant. In the present study, we performed a phase I clinical trial of VGX-6150 in patients with chronic hepatitis C (n=18) who had failed interferon (IFN)-based treatment. Methods: VGX-6150 was administered 4 times in 4-week intervals with in vivo electroporation to three groups of patients (n=6 for 1, 3, and 6 mg/dose groups, respectively) followed by a 6 mg boost 24 weeks later. Significant side effects were not reported. Cellular immune responses of peripheral blood mononuclear cells (PBMCs) were evaluated by IFN-g ELISpot assays using overlapping peptides spanning NS3~NS5A and staining with HCV-specific HLA class I pentamers. Results: The IFN-g spot number specific to NS3~NS5A was increased in 3 and 6 mg/dose groups after the initial vaccination and in all three groups after the boosting vaccination. However, the frequency of HCV-specific HLA class I pentamer+ CD8+ T-cells was not increased by the vaccination. Moreover, the frequency of PD-1+ cells in the gate of HLA class I pentamer+ CD8+ T-cells was not changed by the vaccination. Interestingly, the frequency of CD4+CD25+Foxp3+ regulatory T-cells (Treg) was significantly decreased after the vaccination, consistent with a previous report regarding the effect of an IL-28B-encoding plasmid adjuvant. Conclusions: In the present study, we demonstrate that VGX- 6150 enhances HCV antigen-specific T-cell responses without significant side effects. The inclusion of IL-28B as an immune adjuvant was associated with a decrease in Treg cells that may have provided greater immune activation in chronic HCV infec-tion.