• 디지털융복합연구
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• 제19권5호
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• pp.279-284
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• 2021

본 연구에서는 3차원 전산유체역학 (3-D computational fluid dynamics, CFD)을 이용하여 고체고분자전해질형연료전지 (proton exchange membrane fuel cell, PEMFC)의 기체유로에 대한 성능에 관한 전산모사를 실시하였다. 또한 이 전산모사를 통하여 유체의 농도와 압력분포, 그리고 전류밀도의 분포 등 각종 분포에 관하여 연구를 진행하였다. 본 논문에서는 단일유로와 5개의 유로를 비교분석 하였다. 그 결과 5개의 유로가 단일유로에 비하여 각종 분포들이 균일하였고, 성능 또한 월등하였다. 특히 단일유로에서는 물질전달에의한 성능저하 영역에서 매우 낮은 성능을 확인할 수 있었고 반면 5개의 유로에서는 이 부분을 극복하여 보다 높은 성능을 확인할 수 있었다.

• IMMUNE NETWORK
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• 제16권5호
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• pp.305-310
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• 2016

In this study, we compared two different tumor cell vaccines for their induction of anti-tumor immunity; one was a tumor cell clone expressing a membrane-bound form of IL-12 p35 subunit (mbIL-12 p35 tumor clone), and the other was a tumor clone expressing heterodimeric IL-12 as a single chain (mb-scIL-12 tumor clone). The stimulatory effect of mb-scIL-12 on the proliferation of ConA-activated splenocytes was higher than that of mbIL-12 p35 in vitro. However, the stimulatory effect of mbIL-12 p35 was equivalent to that of recombinant soluble IL-12 (3 ng/ml). Interestingly, both tumor clones (mbIL-12 p35 and mb-scIL-12) showed similar tumorigenicity and induction of systemic anti-tumor immunity in vivo, suggesting that tumor cell expression of the membrane-bound p35 subunit is sufficient to induce anti-tumor immunity in our tumor vaccine model.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 하계학술대회 논문집 Vol.3 No.2
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• pp.964-967
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• 2002

The effectiveness of silicon nitride SiNx surface passivation is investigated and quantified. This study adopted single-layer antireflection (SLAR) coating of SiNx for efficiency improvement of solar cell. The silicon nitride films were deposited by means of plasma enhanced chemical vapor deposition (PECVD) in planar coil reactor. The process gases used were pure ammonia and a mixture of silane and helium. The thickness and the refractive index on the films were measured by ellipsometry and chemical bonds were determined by using an FT-IR equipment. This films obtained were analyzed in term of hydrogen content, refractive index for gas flow ratio $(NH_3/SiH_4)$, and efficiency of solar cell. The polycrystalline silicon solar cells passivated by silicon nitride shows efficiency above 12.8%.

• Genomics & Informatics
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• 제11권1호
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• pp.55-57
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• 2013

Growing numbers of studies employ cell line-based systematic short interfering RNA (siRNA) screens to study gene functions and to identify drug targets. As multiple sources of variations that are unique to siRNA screens exist, there is a growing demand for a computational tool that generates normalized values and standardized scores. However, only a few tools have been available so far with limited usability. Here, we present siMacro, a fast and easy-to-use Microsoft Office Excel-based tool with a graphic user interface, designed to process single-condition or two-condition synthetic screen datasets. siMacro normalizes position and batch effects, censors outlier samples, and calculates Z-scores and robust Z-scores, with a spreadsheet output of >120,000 samples in under 1 minute.

• Rapid Communication in Photoscience
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• 제4권2호
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• pp.29-30
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• 2015

Since the first report on long-term durable perovskite solar cell in 2012, a surge of interest in perovskite solar cell has been received due to its superb photovoltaic performance exceeding 20%. $MAPbI_3$ ($MA=CH_3NH_3$) perovskite film is able to be prepared simply by solution processesof either sequential two-step or single step procedure. Since $MAPbI_3$ shows balanced charge transport property with micrometer scale charge diffusion length, it can be applied to any kind of junction structures. Mostly studied structure is mesoscopic structure employing mesoporous oxide layer in perovskite film. Photovoltaic performance is primarilyin fluenced by the quality of perovskite film but interfaces are equally important. In this mini review, emergence and evolution of perovskite solar cell are described.

• 산업기술연구
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• 제12권
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• pp.25-36
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• 1992

In this paper, we simulate and calculate the stress and output voltage of the beam structure load cells by using FEM as varing physical structure parameters and loading positions. It is proved that stress enhance as the increase of the notch pitch and radius of the load cell, but decrease as the increase of the notch thickness and beam width. The results are good matched for basic formulas of the single fixed beam, and are verified our simulation is correct. Also, it is found that the stress characteristics of the load cell is varied according to loading positions with structure parameters, and caculated output voltage of the load cell approximate to those of the real manufactured ones. As a result, this study will offer efficient design and analysis technique for making special and variety capacity of load cells.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 C
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• pp.1700-1702
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• 1996

Solid oxide fuel cell(SOFC) is an electrochemical energy device which converts the free energy of fuel gas directly to electric energy. SOFC has several diratinct advantages over other types of fuel cells: no use of noble metals, no requirement of a reformer, no problem of liquid electrolyte management, and no problem of corrosion by liquid electrolyte. In this study, we have investigated the cell components and the single cell of the planar SOFC fabricated by composite plate process, in which green films of electrolyte, anode and cathode were co-fired. The planar SOFCs were tested and the cell performance characteristics wag evaluated by using electrochemical methods.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2008년도 춘계학술대회논문집
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• pp.542-546
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• 2008

In this study, we developed a whole cardiovascular system model combined with a Laplace heart based on the numerical cardiac cell model and a detailed arterial network structure. The present model incorporates the Laplace heart model and pulmonary model using the lumped parameter model with the distributed arterial system model. The Laplace heart plays a role of the pump consisted of the atrium and ventricle. We applied a cellular contraction model modulated by calcium concentration and action potential in the single cell. The numerical arterial model is based upon a numerical solution of the one-dimensional momentum equations and continuity equation of flow and vessel wall motion in a geometrically accurate branching network of the arterial system including energy losses at bifurcations. For validation of the present method, the computed pressure waves are compared with the existing experimental observations. Using the cell-system-arterial network combined model, the pathophysiological events from cells to arterial network are delineated.

• International Journal of Aeronautical and Space Sciences
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• 제4권1호
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• pp.9-18
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• 2003

In this work, a closed-form analysis is performed for the structural response of coupled composite blades with multi-cell sections. The analytical model includes the effects of shell wall thickness, transverse shear, torsion warping and constrained warping. The mixed beam approach based on Reissner's semi-complementary energy functional is used to derive the beam force-displacement relations. The theory is validated against experimental test data and other analytical results for coupled composite beams and blades with single-cell box-sections and two-cell airfoils. Correlation of the present method with experimental results and detailed finite element results is found to be very good.

• 한국통신학회논문지
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• 제23권4호
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• pp.865-872
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• 1998

This paper proposes a multiuse detection system in a multi-cell M-ary Frequency Shift Keying(MFSK)/frequency hopping(FH)-Code Division Multiple Access(CDMA) environment, in which the channel model is an OR-channel and in the reverse link. We have proposed a multiuse detection system in a single cell. However, this sitye is not adequate to detect multiuser in a multi-cell environment. Therefore, we propose a multiuser detection system based on 3 level OR decision with two threholds. The proposed detection system can delete interference as well as intra-cell interference, receive the weakened desired signal and reject the false alarm. computer simulation shows the performance improvement.