• Proceedings of the KSAR Conference
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• 2009.06a
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• pp.6-7
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• 2009

• 한국정보디스플레이학회:학술대회논문집
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• 2009.10a
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• pp.1200-1203
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• 2009

A solution processed polymer tandem cell has been fabricated by using the organic layer coated crystalline $TiO_2$ nanoparticle inter layer. The highly dispersive OL-$TiO_2$ has several advantages in terms of excellent film forming property, crystallinity, optical transparency, and well defined chemical composition. The surface morphology of the $TiO_2$ thin film was found to play a crucial role in the performance of the polymer tandem cell. The stability of the tandem cell, utilizing dense $TiO_2$ nanoparticles inter layer, was superior to the stability of the single junction cell.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.855-858
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• 2008

Transient current (TC) on bulk-state liquid crystal mixtures was measured. We found that TC is very sensitive to impurities and the features of TC curves depend on the type of contamination, from which the quality of materials can be definitely evaluated and the type of impurities can also be revealed.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2004.05a
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• pp.103-108
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• 2004

• Proceedings of the Polymer Society of Korea Conference
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• 2006.10a
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• pp.185-185
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• 2006

The performances of proton exchange membrane fuel cell (PEMFC), direct formic acid fuel cell (DFAFC) and direct methanol fuel cell (DMFC) with sulfonated poly(ether sulfone) membrane are reported. Pt/C was coated on the membrane directly to fabricate a MEA for PEMFC operation. A single cell test was carried out using $H_2/air$ gases as fuel and oxidant. A current density of $730\;mA/cm^2$ at 0.60 V was obtained at $70^{\circ}C$. Pt-Ru (anode) and Pt (cathode) were coated on the membrane for DMFC operations. It produced $83\;mW/cm^2$ of maximum power density. The sulfonated poly(ether sulfone) membrane was also used for DFAFC operation under several different conditions. It showed good cell performances for several different kinds of polymer electrolyte fuel cell applications.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.2457-2460
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• 2003

There is a great demand to manipulate biological cell autonomously since biologist should spend much time to obtain skillful manipulation techniques. For this purpose, we propose a cell chip to control, carry, fix and locate the cell. In this paper, we focus on the cell rotator to rotate individual biological cell based on a micro fluidics technology. The cell rotator consists of injection hole and rotation well to rotate a biological cell properly. Under the variation of flow rate in injection hole, the angular velocity of a biological cell is evaluated to find the feasibility of the proposed rotation method. As a practical experiment, Zebrafish egg is employed. Based on this research, we find the possibility of non-contact rotation way that can highly reduce the damage of the biological cell during manipulation. To realize an autonomous biological cell manipulation, a cell chip with manipulation well and micro channel in this research will be utilized effectively in near future.

• Molecules and Cells
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• v.21 no.1
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• pp.29-33
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• 2006

We have established three immortal bovine muscular epithelial (BME) cell lines, one spontaneously immortalized (BMES), the second SV40LT-mediated (BMEV) and the third hTERT-mediated (BMET). The morphology of the three immortal cell lines was similar to that of early passage primary BME cells. Each of the immortal cell lines made cytokeratin, a typical epithelial marker. BMET grew faster than the other immortal lines and the BME cells, in 10% FBS-DMEM medium, whereas neither the primary cells nor the three immortal cell lines grew in 0.5% FBS-DMEM. The primary BME cells and the immortal cell lines, with the exception of BMES, made increasing amounts of p53 protein when treated with doxorubicin, a DNA damaging agent. On the other hand, almost half of the cells in populations of the three immortal cell lines may lack $p16^{INK4a}$ regulatory function, compared to primary BME cells that were growth arrested by enforced expression of $p16^{INK4a}$. In soft-agar assays, the primary cells and immortal cell lines proved to be less transformed in phenotype than HeLa cells. The three immortal epithelial-type cell lines reported here are the first cell lines established from muscle tissue of bovine or other species.

• Bulletin of the Korean Chemical Society
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• v.30 no.4
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• pp.959-960
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• 2009

• Journal of Electrochemical Science and Technology
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• v.13 no.4
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• pp.462-471
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• 2022

In this study, the electrochemical impedance characteristics of CO₂/H₂O co-reduction to produce CO/H₂ syngas were investigated in a low-temperature single cell. The effect of the operating conditions on the single-cell performance was evaluated at different feed concentrations and cell voltages, and the corresponding electrochemical impedance spectroscopy (EIS) data were collected and analyzed. The Nyquist plots exhibited two semicircles with separated characteristic frequencies of approximately 1 kHz and tens of Hz. The high-frequency semicircles, which depend only on the catholyte concentration, could be correlated to the charge transfer processes in competitive CO₂ reduction and hydrogen evolution reactions at the cathodes. The EIS characteristics of the CO₂/H₂O co-reduction single cell could be explained by the equivalent circuit suggested in this study. In this circuit, the cathodic mass transfer and anodic charge transfer processes are collectively represented by a parallel combination of resistance and a constant phase element to show low-frequency semicircles. Through nonlinear fitting using the equivalent circuit, the parameters for each electrochemical element, such as polarization resistances for high- and low-frequency processes, could be quantified as functions of feed concentration and cell voltage.

• Bulletin of the Korean Chemical Society
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• v.33 no.2
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• pp.699-702
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• 2012