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Seo, M.J.,Kim, G.R.,Son, Y.M.,Yang, D.C.,Chu, H.,Min, T.S.,Jung, I.D.,Park, Y.M.,Han, S.H.,Yun, C.H. Pergamon Press 2011 Molecular immunology Vol.48 No.15
To understand the interaction of dendritic cells (DCs) with cancer cells, we investigated molecular changes in DCs following co-culture with cancer cells. DCs co-cultured with Jurkat cancer cells showed remarkable down-regulation of MHC class I molecules, while DCs co-cultured with MCF-7 cancer cells showed minimal changes. Interestingly, down-regulation of MHC class I on DCs was not observed upon treatment with Jurkat cell lysate or culture supernatant, suggesting the importance of direct cell-cell interactions. The expressions of CD40, CD80, CD83, MHC class II, and IL-12p40 on DCs co-cultured with Jurkat cells were only slightly affected. In contrast, DCs co-cultured with MCF-7 cells showed increased expressions of CD80, CD83, CD86, and IL-12p40. Furthermore, DCs co-cultured with Jurkat cells showed a down-regulation of low molecular weight polypeptides (LMP) 7, and of transporter associated with antigen processing (TAP) 1 and 2 at the mRNA expression level. LMP7, TAP2 and β2-microglobulin (β2M) were also down-regulated at the protein level. We further demonstrated how altered expression of MHC class I on DCs caused by co-culture with cancer cells affected autologous CD8<SUP>+</SUP> T cells, using the model MHC class I-presented HSV antigen. We found that DCs that had been HSV-treated and co-cultured with Jurkat cells showed a reduced potency to activate CD8<SUP>+</SUP> T cells. In contrast, HSV-treated DCs that had been co-cultured with MCF-7 cells induced activation of CD8<SUP>+</SUP> T cells, including high expression of CD25, CD69, granzyme B and cytokines, TNF-α and IFN-γ.
그래프로 표현된 자료의 관리를 위한 데이터베이스 라이브러리 설계에 관한 연구
박휴찬,추인경 한국해양대학교 산업기술연구소 2002 연구논문집 Vol.19 No.-
The graph has provided a powerful methodology to solve a lot of real-world problems. There has been much research on the graph representations and algorithms. But, there are still many difficulties to apply the graph to practical domains. This paper proposes a graph library designed on the relational database. Graphs are represented in the form of relational tables and then saved in a database. Graph operations are coded in terms of the database language, SQL, and general purpose programming language, C. users of the graph library can manage efficiently a large amount of graph data. Furthermore, graphs saved in the database can be concurrently shared among many users. The proposed graph library may be useful to represent and solve real world problems efficiently.
Park, S.,Kang, B. K.,Shin, J. W.,Joo, C.,Moon, J.,Cho, D. H.,Yu, B.,Chu, H.,Lee, J. I. Royal Society of Chemistry 2014 Journal of materials chemistry. C, Materials for o Vol.2 No.22
We have evaluated high refractive index organic-inorganic hybrid films fabricated from a solution prepared from triethylene glycol and titanium(m) butoxide in N,N-dimethyl acetamide (DMAc). The organic-inorganic hybrid solution in DMAc is homogeneous and stable. The solution was spin-coated on a silicon wafer and a glass plate and dried under nitrogen to give a transparent film. The refractive index (n), transparency, and thickness of the hybrid films fabricated from the solution varied as the film drying conditions and feeding mole ratios between the organic and inorganic compounds were varied. The film drying condition was observed to have a strong influence on the surface evenness of the films. The refractive indices of the films were between 1.62 and 2,16 at a wavelength of ca. 600 nm. Scanning electron microscope (SEM) and atomic force microscope (AFM) results showed that the films were very smooth and that the root-mean-square values (R-a) of the surface roughness of the films were between 0.25 and 2.37 nm depending on the film drying conditions. Values for n and Ra of the hybrid film were 2.06 and 0.25 nm, respectively, when it was annealed at 250 degrees C. The film transparency and thickness increased with decreasing the annealing temperature. We identify our organic-inorganic hybrid solutions as possible good candidate materials for films with high refractive index and surface evenness.
Passivation of Bottom-Gate IGZO Thin Film Transistors
D. H. Cho,S. H. Yang,J.-H. Shin,C. W. Byun,M. K. Ryu,J. I. Lee,C. S. Hwang,H. Y. Chu 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
We have studied transparent bottom-gate TFTs (thin film transistors) using amorphous IGZO (In-Ga-Zn-O) as an active channel material. The TFT devices had inverse co-planar structures. Source/drain and gate electrodes were constituted by ITO sputtered with a DC-RF magnetron sputter system, and an alkaline-free glass was used as a substrate. The gate insulator was Al<SUB>2</SUB>O<SUB>3</SUB> formed by using an atomic layer deposition (ALD) method at 150 ℃. An active layer was formed by off-axis RF magnetron sputtering and post-annealing was performed with a hot plate or a vacuum oven. The field effect mobilities and the sub-threshold swings of the IGZO TFTs were 12 ∼ 18 cm<SUP>2</SUP>/Vs and 0.2 ∼ 0.6 V/dec, respectively. However, the hysteresis on I-V characteristics was relatively large without passivation. Thus, we passivated the TFT devices with inorganic and organic materials. After the organic passivation and post-heat treatments, the hysteresis was remarkably reduced without deterioration of the electrical characteristics.
Observation of critical heat flux mechanism in horizontal pool boiling of saturated water
Chu, I.C.,NO, H.C.,Song, C.H.,Euh, D.J. North-Holland Pub. Co 2014 Nuclear engineering and design Vol.279 No.-
We observed the global boiling structure and dynamic behavior of dry areas in a synchronized manner to identify the critical heat flux (CHF) triggering mechanism in a horizontal pool boiling of saturated water. A transparent Indium Tin Oxide (ITO) heating surface was used to accommodate a total reflection technique. The total reflection images captured the detailed processes of the generation of discrete dry spots, the formation and rewetting of large dry patches, and the irreversible expansion of the dry patch which led to the occurrence of the CHF. Contrary to the common postulation that a thin liquid film exists stably under a coalesced massive bubble, the base of hovering massive bubbles was almost dry at more than 10% below the CHF condition. The key element that determines the occurrence of the CHF was the production of the residual dry patch and consecutive re-expansion of the residual dry patch owing to the enhanced bubble nucleation activity with an increase in wall superheat, rather than the complete dryness of a boiling surface under a hovering massive bubble. The dry area fraction of the present water boiling test was similar to that of the R-113 boiling test in the literature in spite of significant differences in the wettability and physical properties.