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골격근 손상 및 재생 환경에서의 근육 세포 군집 이동의 물리적 특성 가시화
권태윤,정현태,조영빈,신현정 한국가시화정보학회 2022 한국가시화정보학회지 Vol.20 No.2
Skeletal muscle tissues feature cellular heterogeneity, including differentiated myofibers, myoblasts, and satellite cells. Thanks to the presence of undifferentiated myoblasts and satellite cells, skeletal muscle tissues can self-regenerate after injury. In skeletal muscle regeneration, the collective motions among these cell types must play a significant role, but little is known about the dynamic collective behavior during the regeneration. In this study, we constructed in vitro platform to visualize the migration behavior of skeletal muscle cells in specific conditions that mimic the biochemical environment of injured skeletal muscles. We then visualized the spatiotemporal distribution of stresses arising from the differential collectiveness in the cellular clusters under different conditions. From these analyses, we identified that the heterogeneous population of muscle cells exhibited distinct collective migration patterns in the injury-mimicking condition, suggesting selective activation of a specific cell type by the biochemical cues from the injured skeletal muscles.
모듈러 지중아치 구조 안전성 검토를 위한 간략 해석 및 평가방법에 관한 연구
권태윤,조광일,이원홍,안진희 한국구조물진단유지관리공학회 2022 한국구조물진단유지관리공학회 논문집 Vol.26 No.3
A modular underground arch structure using steel and concrete has been proposed as a structure that has a simple construction process and can effectively resist cross-sectional forces generated during construction and use. Structural behavior of modular underground arch was evaluated about span length less than 15m through 3D structural analysis and test. In general, 2D and 3D structural analysis methods may be applied for structural analysis such as underground arch and tunnels. However, if a 2D or 3D structural analysis method is applied to evaluate the structural safety of a modular underground arch structure, it is difficult to model for structural analysis and it may take an excessively long time to interpret. Therefore, it may not be reasonable as a structural analysis method for considering the structural safety and earth pressure in the design process of a modular underground arch structure. In addition, when a modular underground arch structure is configured for span lengths to which the predetermined cross-section is applicable, it may be reasonable to evaluate only the safety of the structure and cross-section according to the cross-section and load conditions. Therefore, in this study, a structural analysis model using frame elements was proposed for efficient structural safety evaluation. In addition, structural analysis results of the 2D structural analysis model and the simplified analysis model using frame elements were compared, and the structural safety of the modular underground arch structure for a span length of 20m was evaluated with a simplified analysis method. 모듈러 지중아치 구조는 시공과정이 단순하며 강재와 콘크리트를 이용하여 시공 및 공용 중에 발생하는 단면력에 대하여 효과적으로 저항할 수 있는 구조로 제안되어 15m 이하의 지간에 대하여 3차원 구조해석 및 실험을 통하여 구조적 거동이 평가되었다. 일반적으로 지중아치와 터널 등의 구조해석의 경우 2차원이나 3차원 구조해석 방법이 적용될 수 있다. 하지만, 모듈러 지중아치 구조의 구조적 안전성 평가를 위하여 2차원이나 3차원 구조해석 방법을 적용할 경우 구조해석을 위한 모형화가 어렵고, 해석시간이 과도하게 오래 걸릴 수 있으므로, 모듈러 지중아치 구조의 설계과정에서 필요한 구조 안전성 및 토압 등을 고려한 구조해석 방법으로는 합리적이지 않을 수 있다. 또한, 사전에 결정된 단면이 적용가능한 지간에 대하여 모듈러 지중아치 구조를 구성하는 경우 지간과 하중조건에 따른 단면과 구조적 안전성만을 평가하는 것이 합리적일 수 있다. 따라서, 본 연구에서는 효율적인 구조 안전성 평가를 위하여 프레임 요소를 이용한 구조해석 모델을 제안하고, 2차원 구조해석모델과 프레임 요소를 이용한 간략해석모델의 구조해석 결과를 비교하였으며, 간략해석 방법을 이용하여 20m지간의 모듈러 지중아치 구조의 구조적 안전성을 평가하였다.
Fabrication of piezoelectric thick films for development of micromechanical cantilevers
권태윤,신경식,Minsurk Hyung,엄길호,김태송 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.8
We fabricated a piezoelectric thick film, whose electromechanical properties are optimized, for development of micromechanical cantileveras a sensor and actuator. Specifically, we studied the electromechanical properties of piezoelectric thick films made of differentkinds of piezoelectric powders with their different sizes. The electromechanical properties of piezoelectric thick film are optimized whenit is made of both micro- and nano-sized piezoelectric particles. Moreover, we fabricated a micromechanical cantilever using piezoelectricthick film, and investigated the vibrational characteristics of piezoelectric thick film-based microcantilevers. It is shown that a cantilevermade of optimized piezoelectric thick film exhibits the excellent vibrational properties such as high Q-factor even in a viscous fluid,and that the resonance behavior of such a cantilever is very stable when compared with cantilevers made of other piezoelectric thick films. Our study provides the design rule of piezoelectric thick film for further development of micromechanical devices based on such a piezoelectricfilm.
권태윤,Kwan Tae Yun 한국시멘트협회 1973 시멘트 심포지움 Vol. No.
In cement industry in which three or more raw materials are used, the proportioning of raw materials is an essential step. When the materials are proportioned, each should be as nearly homogeneous chemically and physically as conditions permit. Most of th
권태윤,Gwon, Tae-Yun 대한석유협회 1994 석유와 에너지 Vol.1994 No.3
국내 LPG 가격제도는 장기적으로 LPG 수입기지의 추가 건설로 공급능력을 확충하여 공급의 경쟁성을 확보한후 LPG 가격을 연동제 또는 자유화할 계획이다.
유통구조상에서 협력의 수준, 의존성 , 강압적 힘, 비강압적 힘, 갈등간의 관계
권태윤,김원종 경운대학교 산업기술연구소 2002 産業技術硏究論文誌 Vol.5 No.1(A)
This study addresses the relationship among the level of cooperation, dependence, coercive Power, non-coercive power, and conflict in the channel structure. Six hypotheses were generated regarding the relationship among these constructs. A field survey was employed to collect data on the relationship, and the data was carried out using reliability analysis, factor analysis, and regression analysis. The results from this study indicate that three hypotheses were rejected.