가역 고체산화물 연료전지 모델링을 위한 분극 특성에 대한 수치해석적 연구

윤도영,정정열,한경호 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1

가역 고체 산화물 연료 전지(SORFC)는 하나의 막-극 접합체로 고체 산화물 연료 전지(SOFC) 모드와 고체 산화물 수전해 시스템(SOEC) 모드 둘 다 운전 가능하다는 특징을 가진다. 또한 가역 고체 산화물 연료 전지는 고온에서 작동되기 때문에 비교적 낮은 Open-Circuit Voltage(OCV)를 가지며, 전극에서 발생하는 활성화 과전압이 낮다는 장점을 가지고 있다. 이에 따라 가역 고체 산화물 연료 전지에 대한 실험적인 연구는 활발하게 진행되고 있는 반면, 가역 고체 산화물 연료 전지에 대한 모델링 연구는 고체 산화물 수전해 시스템 모드와 고체 산화물 수전해 시스템 모드에서 서로 다른 분극 특성을 갖기 때문에 비교적 부진하다. 이에 본 연구에서는 가역 고체 산화물 연료 전지를 모델링하기 위하여 가역 고체 산화물 연료 전지의 운전 조건에 따른 분극 특성 및 성능 변화를 수치해석적으로 분석하고자 한다.

화학공정; 1P-453 : LAMMPS를 이용한 Quantum dot 합성 모델링

윤도영,신인성 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.0

Molecular design of anti-biofouling materials from natural phenolic compounds

윤도영,Dong-Shik Kim 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.2

Many natural phenolic compounds found in plants are well known for their antibiotic and antioxidant activities. It has been hypothesized that these activities of natural phenols could be used for developing permanent antibiofouling coatings. In this study, two phenolic components, anacardic acid and cardanol, were extracted from cashew nut shell liquid, and tested for their antibiotic and anti-biofouling activities against Pseudomonas fluorescens. Both compounds killed all the cells within 18 hours (anacardic acid) and 30 hours (cardanol) after the addition to the culture media at a concentration of 800 μg/ml. To form a stable permanent coating of these compounds, first they were polymerized by enzymatic polymerization, and the polymers were cross-linked on a glass slide. P. fluorescens were cultured on the coated and uncoated glasses for two weeks, and the images of the cells grown on the surfaces were taken by SEM. The coated surfaces clearly demonstrated anti-biofouling activities, showing not only fewer numbers of cells but also less exopolymer than the uncoated surfaces. Based on these results, a phenolic compound with a similar structure of anacardic acid was synthesized by using propylene diamine and fluorocarboxylic acid with cardanol. The synthesized phenolic compound was polymerized and cross-linked on a glass slide to test the anti-biofouling activity. The SEM images of the cells on the coated surface showed considerable decreases in the number of adhered cells and the amount of exopolymers even more than the anacardic acid and cardanol coatings. It is thought that the natural phenolic compounds with active functional groups can be used for anti-biofouling agents.

A Case with Bibrachial Variant of Guillain-Barré Syndrome

윤도영,박두용,한현정,박기덕,김지영 대한근전도전기진단의학회 2014 대한근전도 전기진단의학회지 Vol.16 No.2

The bibrachial variant of Guillain-Barré syndrome (GBS) is characterized by rapidly progressive and predominantweakness of both upper extremities with hyporeflexia or areflexia. Because the bibracial variantis rare, the pathomechanism and disease course has not been clarified. We report a 42-year-old man withrapidly progressive weakness of both arms. His electrophysiological study showed partial conductionblocks of motor nerves normalized without development of excessive temporal dispersion within 3 weeks. This case suggests that the main pathophysiological mechanism is reversible conduction block and it maybe in the continuous spectrum of axonal motor GBS subtype.

프로제스테론 단일클론 항체의 생산과 정제 및 특성연구

윤도영,최상훈,최명자,최인성,정태화 ( Do Young Yoon,Sang Hoon Choi,Myung Ja Choi,In Seong Choe,Tai Wha Chung ) 생화학분자생물학회 1991 BMB Reports Vol.24 No.1

Seven hybridoma cell lines, 051-01 (IgG₁), 051-02 (IgG_(2b)), 051-03 (IgG₁,), 051-04 (IgM), 051-05 (IgG_(2a)), 051-06 (IgM), and 051-07 (IgG_(2a)) prodcing monoclonal antibodies against progesterone were established. Progesterone llα-hemisuccinate-bovine serum albumin conjugate was prepared using carbodiimide and then used as an immunogen. Spleen cells of Balb/c mice immunized with the immunogen were fused with mouse myeloma (P3-X63-Ag8.653) cells. Hybridoma cells were screened by radioimmunoassay using ³H-progesterone. The clones 051-01, 051-03, and 051-05 were purified using protein A-Sepharose 4B affinity chromatography utilizing their subtype characteristics. The purity of the isolated IgG was identified by SDS-PAGE. The progesterone binding capacity of the 5 monoclonal antibodies ranged from 7 to 72 pmole/㎎ IgG and the affinity constant ranged from 5.0×10^7 M^(-1) to 4×10^8 M^(-1) by the Scatchard analysis method. Cross-reactivities of the monoclonal antibodies, 051-01 and 051-02 with other steroid hormones were compared. These antibody reactions were very specific to progesterone and sensitive in a competitive immunoassay.

Influence of processing temperature on the image transfer characteristics of an image guide made of polymer optical fibers

윤도영,Byung-Wook Park,Soeun Park 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.1

An image guide has been made by using polymer optical fibers. Single-strand polymer optical fibers were laid out first in a square array, and the square bundle thus made was fused in a vacuum oven at various processing temperatures. Although the line resolution of an image guide is determined by the number of optical fibers per unit area (i.e., the pixel density), the fusion temperature affects the cohesiveness of neighboring fibers that influences the portrait quality of the image guide. The objective of this study was to investigate the influence of fusion temperature on the portrait quality of the image guide. The image transfer characteristics were evaluated quantitatively by using a computer program that was developed in our laboratory for the comparison with a macrography. The present result indicates that there exists an optimum fusion temperature for the optimum cohesion between neighboring fibers that maximizes the brightness of an image without cross-talk.

Anti - Progesterone Monoclonal Antibody 에 대한 Anti - Idiotype 항체의 불임효과에 관한 연구

윤도영,남경수,이희구,이홍수,최명자,최인성,김종배,정태화 ( Do Young Yoon,Kyung Soo Nam,Hee Gu Lee,Hong Soo Lee,Myung Ja Choi,In Seong Choe,Jong Bae Kim,Tai Wha Chung ) 생화학분자생물학회 1991 BMB Reports Vol.24 No.6

The active immunization of progesterone produces high titer antibodies. However, the progesterone itself binds to the receptor sites and produces the side effect on the contraceptive activities of the antibodies. Therefore, the anti-idiotypic antibody (anti-Id) was studied whether it had the same effect as the active immunization of progesterone to prevent pregnancy or not. If it has antifertility effect, it could be utilized as a contraceptive vaccine. The passive immunization of antibody to mice was previously studied and found that anti-progesterone monoclonal antibody prevents pregnancy by degenerating the embryos in the oviduct and uterus (Yoon et al., 1989). The polyclonal anti-Id was obtained by immunizing anti-progesterone monoclonal antibody (15A) to rabbit and then purified using affinity column chromatography. Furthermore, three different clones (G2, G9, H6) of monoclonal anti-Ids have been raised against anti-progesterone monoclonal antibody. The relationships between the antifertility effects and anti-progesterone antibody level were studied by the active immunization of anti-Id and progesterone-BSA. The results showed that a higher antifertility effect was observed with progesterone-BSA immunization (70%) than with anti-Id immunization (55%). The plasma level of anti-progesterone was as high as 3,500 ㎍/㎖ with progesterone-BSA immunization. The comparison study of the antibody levels between pregnant (10 ㎍/㎖) and non-pregnant mice (44 ㎍/㎖) after immunization with the anti-Id indicates that antibody formation at a certain level prevents pregnancy. However, the antibody level is not proportional to the antifertility effect in mice.

하부면이 일정열속으로 가열되는 수평 다공질 유체층의 자연대류 유발에 관한 해석

윤도영,최창균 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.5

유체로 포화되어 있는 초기 정지상태의 수평 다공질 유체충의 하부면이 일정열속으로 가열될 때, 시간의존성의 비선형 온도분포하에서 자연대류 임계시점을 이론적으로 예측하였다. 안정성해석은 선형이론과 안정성교환의 원리하에서 열침투깊이가 길이척도인자로 사용되는 전파이론에 근거하였다. 교란의 시간의존성 변화를 고려하기 위하여 유사변환을 통한 교란방정식의 해를 수치적으로 구하여, 정규적인 세포 형태의 교란이 발생될 임계시점을 Rayleigh 수, Prandtl 수 그리고 Darcy 수의 함수로 구성되는 상관식을 유도하였다. Prandtl 수, Darcy 수가 작아질수록 같은 가열조건에 대하여 자연대류는 늦게 발생되는 것으로 보여진다. When an initially quiescent, horizontal porous layer saturated with fluid experiences uniform heating from below, the time of the onset of natural convection in time-dependent, nonlinear temperature fields is predicted theoretically. The stability analysis is conducted on the basis of the propagation theory in which the thermal penetration depth is used as a length scaling factor under linear theory with the principle of exchange of stabilities. The solution for disturbance equations of similar transform considering time-dependent variations of disturbances is obtained numerically. The resulting correlations of the critical time to mark the onset of regular cells are derived as a function of the Rayleigh number, Prandtl number, and Darcy number. It is seen that natural convection sets in later as the Prandtl number and the Darcy number become smaller.

MATLAB을 이용한 고체산화물 수전해 시스템 매개 변수 연구

윤도영,정정열 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0

고체 산화물 수전해 시스템을 통한 수증기 전해방법은 고온에서 작동되기 때문에 낮은 OCV(Open-Circuit Voltage)와 활성화 과전압을 특징으로 가진다. 하지만 수전해 시스템의 반응속도의 증가로 인해서 반응물의 고갈은 가속화되기 때문에 고체 산화물 수전해 시스템은 높은 전류밀도에서 물질전달 손실이 기하급수적으로 증가하여 에너지 효율이 급감한다는 단점을 지니고 있다. 또한 전극 표면에서의 반응물의 고갈로 나타나는 한계전류밀도 역시 온도가 높아짐에 따라서 줄어들기 때문에 작동구간은 좁아지는 특징을 가진다. 본 연구에서는 고체 산화물 수전해시스템의 과전압 중에서 물질전달 손실에 초점을 맞추었으며 고체 산화물 수전해시스템의 실험 데이터를 기반으로 전산모사 모델의 타당성을 검증하고 물질전달 손실에 가장 큰 영향을 미치는 압력을 매개변수로 조작하여 물질전달 손실과 한계전류밀도의 변화 그리고 이에 따른 나머지 손실들과 성능에 대한 영향을 분석하고자 한다.

Synthesis and Properties of Inorganic-Organic Block Copolymers for Nanocomposites and Nanoporous Low-Dielectric Materials

윤도영,Patrick Theato 한국고분자학회 2002 한국고분자학회 학술대회 연구논문 초록집 Vol.2002 No.10