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Electrode Performance in a Solid Oxide Electrolyzer Cell (SOEC)
Lee, Kyoung Jin,Seo, J. W.,Yoon, Jong Seol,Hwang, Hae Jin The Electrochemical Society 2013 ECS transactions Vol.57 No.1
<P>An electrolyte-supported solid oxide electrolysis cell (SOEC) consisting of a ScSZ (Sc<SUB>2</SUB>O<SUB>3</SUB>-stabilized ZrO<SUB>2</SUB>) electrolyte, Ni-YSZ cathode and LSCF (lanthanum strontium cobalt ferrite)-GDC (Gd<SUB>2</SUB>O<SUB>3</SUB>-doped CeO<SUB>2</SUB>) anode was fabricated. Current density-voltage (j-V) curves were obtained for the cell under SOFC and SOEC modes and the cell performance was discussed in combination with corresponding EIS measurements. It was possible to determine the ohmic, cathodic and anodic contributions to the total polarization loss using the three-electrode technique. It was found that the overpotential of the Ni-YSZ electrode contributed largely to the performance of the cell.</P>
Bluetooth DK를 이용한 동영상 전송 시스템 구현
조경연,이승은,최종찬 호서대학교 반도체제조장비국산화연구센터 2001 반도체장비학술심포지움 Vol.2001 No.-
본 논문은 ATMEL Bluetooth Development Kit (DK)를 이용하여 음성과 데이터를 전송하는 시스템을 구현하는 것으로, Bluetooth 디바이스간 연결을 위한 과정을 분석하였다.또한, Synchronous Connection-Oriented (SCO) 링크와 Asynchronous Connectionless (ACL) 링크를 형성하여 음성과 데이터를 송수신하는 어플리케이션을 구현하였다.향후 가정, 사무실, 공장등에서 근거리 무선 통신 기술로 자리잡아갈 Bluetooth 기술을 적용한 어플리케이션 개발은 필수적이다.본 논문에서는 Bluetooth 호스트 컨트롤러 인터페이스 (HCI)를 이용한 어플리케이션 개발 과정을 제시하였다.
위상형 CGH(computer generated hologram)를 이용한 비구면 파면 및 Bessel beam 제작
성기영,경천수,이영락,이정훈,이상조,곽종훈 영남대학교 기초과학연구소 2000 基礎科學硏究 Vol.20 No.-
We have designed and fabricated computer generated holograms(CGH) to generate ashepheric wavefront and Bessel beam. Designed CGH is recorded onto the photopolymer which is used as a volume hologram material mating CGHOE(computer generated holographic optical element). To investigate properties of fabricated CGHOE, intensities of Bessel beam are measured as a function of propagation(z-axis) and transverse (x-axis) distances.
일차병소의 재발없이 두개강외 전이한 천막상부 수강상피종 : 1예 보고
김한규,김순철,조경기,김광명,설대위,지제근 대한신경외과학회 1981 Journal of Korean neurosurgical society Vol.10 No.2
A case of supratentorial ependymoma in a 48-year-old man. After operation and radiological treatment, metastasis to scalp and cervical lymph node occurred, without recurrence of primary focus. 11cases of intracranial ependymoma with extracranial metastasis were reviewed. Metastasizing intracranial ependymomas are 3 times as frequent in males and originate above tentorium. The most effective transmission of metastasis of ependymoma is through the blood stream and the frequent sites of metastasis are lungs, pulmonary hilus, mediastinum, Iiver, scalp, vertebra, femoral bone and cervical lymph nodes. Our case is the oldest among reported cases and metastasized to relatively rare site.
Song, Sun U.,Cha, Young-Deog,Han, Jeoung-Uk,Oh, In-Suk,Choi, Kyoung Baek,Yi, Youngsuk,Hyun, Jong-Pil,Lee, Hyeon-Youl,Chi, Guang Fan,Lim, Chae-Lyul,Ganjei, J. Kelly,Noh, Moon-Jong,Kim, Seong-Jin,Lee, D Mary Ann Liebert, Inc 2005 Tissue engineering Vol.11 No.9-10
<P>The purpose of this study was to investigate the efficacy of cartilage regeneration when using a mixture of transforming growth factor-beta1 (TGF-beta1)-producing human chondrocytes (hChon-TGF-beta1) and primary human chondrocytes (hChon) ('mixed cells'), compared with either hChon-TGF-beta1 or hChon cells alone. Specifically, mixed cells or hChon cells were first injected intradermally into the backs of immune-deficient nude mice to test the feasibility of cartilage formation in vivo. Both the mixed cells and the hChon-TGF-beta1 cells alone induced cartilage formation in nude mice, whereas hChon cells alone did not. To further test the efficacy of the cells in generating cartilage, an artificially induced partial thickness defect of the femoral condyle of a rabbit knee joint was loaded with hChon-TGF-beta1 cells with or without mixing additional untransduced hChon cells, and hyaline cartilage regeneration was observed at 4 or 6 weeks. The efficiency of complete filling of the defect and the quality of tissue generated after implanting were evaluated on the basis of a histological grading system modified from O'Driscoll et al. (J. Bone Joint Surg. 70A, 595, 1988). Significantly, mixed cells (14.2 +/- 0.9) produced significantly better results than hChon-TGF-beta1 (9.0 +/- 1.7) or hChon (8.0 +/- 1.8) cells alone. Histological and immunohistochemical staining of the newly repaired tissues produced after treatment with either mixed cells or hChon-TGF-beta1 cells alone showed hyaline cartilage- like characteristics. These results suggest that the implantation of mixed cells may be a clinically efficient method of regenerating hyaline articular cartilage.</P>
Genetic Toxicity Test of Methylcarbamate by Ames, Micronucleus, Comet Assays and Microarray Analysis
( Kyoung J. Kwon ),( Seo Y. Go ),( Sue N. Park ),( Yhun Y. Sheen ) 한국응용약물학회 2007 Biomolecules & Therapeutics(구 응용약물학회지) Vol.15 No.3
Carbamates have excellent insecticidal activities against a broad spectrum of insects. They possess knocking-down, fast-killing, and systemic effects, however, they are toxic to mammals. In this study, we have carried out in vitro genetic toxicity test of methylcarbamate and microarray analysis of differentially expressed genes in response to methylcarbamate. Methylcarbamate did not show mutations in base substitution strain TA1535 both with and without exogenous metabolic activation. Methylcarbamate did not show mutations in frame shift TA98 both with and without exogenous metabolic activation. Methylcarbamate showed DNA damage based on single cell gel/comet assay in L5178Y cells both with and without exogenous metabolic activation. Methylcarbamate did not increase micronuclei in CHO cells both with and without exogenous metabolic activation. Microarray analysis of gene expression profiles in L5178Y cells in response to methylcarbamate selected differentially expressed 132 genes that could be candidate biomarkers of genetic toxic action of methylcarbamate.
경지수(J. S. Kyoung),신동석(D. S. Shin),전의식(E. S. Jeon) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
개인 및 화물의 이동수단으로서 친환경 퍼스널 모빌리티(Personal Mobility)의 활용이 증가하고 있다. 퍼스널 모빌리티는 안전성과 편의성을 만족시키기 위하여, 박판 부품의 활용과 다양한 편의장치가 부가되어 있다. 그러나 박판 프레임은 가변이 불가하여 다목적 활용이 어렵고, 다양한 편의장치들은 중량을 증가시킴으로써 구동저항의 원인이 되고 있다. 그러므로 다목적성을 만족시키기 위해서 프레임을 골격형으로 선정해야 하고, 구동저항을 감소시키기 위해서 공학적인 최적화 방법으로 프레임 및 결합 부품들에 대한 소재 및 두께 최적화를 수행해야 한다. 본 논문에서는 골격형 퍼스널 모빌리티 모델에 대하여, 메타모델 기반 최적설계 이론을 이용하여 경량최적화 하는 과정을 제시했다. 먼저 퍼스널 모빌리티 모델에 대한 유한요소모델링을 수행했다. 그리고 프레임 부품들을 소재의 변화, 두께의 변화가 가능한 변수로 설정했다. 소재는 미리 입력되어 있는 경우의 수로 이산화 하였으며, 두께도 미리 입력된 경우의 수로 이산화 하였다. 각 부품의 소재와 두께의 조합은 실험계획법에 의거하여 배치하였고 각 실험점에 해당하는 유한요소해석을 수행하였다. 각 실험점의 반응은 강도와 중량을 취했으며, 실험계획표에 의거하여 반응표면생성을 수행하였다. 반응표면생성 모델은 2 차 다항식으로 선정했다. 반응표면에서 중량 최소화 조건과 강도기준을 만족하는 도출하기 위하여 유전알고리즘을 활용했다. 그리고 메타모델기반 최적점에 대한 유한요소해석을 통해 최적화 결과에 대한 검증을 수행했다. 이러한 연구 과정은 다양한 퍼스널 모빌리티 프레임의 개념설계 단계에서 활용할 수 있을 것으로 사료된다.