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나노-마이크로 정밀 분사 시스템을 이용한 3차원 하이브리드 인공지지체 제작에 관한 연구
하성우(Seong-Woo Ha),김종영(Jong Young Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In the last 10 years, nanofiber structures fabricated by electrospinning technology have received a lot of attentions as a scaffold for tissue engineering. Electrospinning is a technique for the nanofiber production with diameters of nanomicro scale. In this study, three-dimensional hybrid scaffold was fabricated by nano-micro precision deposition system. Hybrid scaffold was combined in micro scaffold using solid freeform fabrication technology and nanofiber using electrospinning. In the process, micro scaffold was fabricated by 200 mm/sec of scan velocity, 110˚C of temperature and 650 kPa of pressure using solid freeform fabrication technology. For the electrospinning process, nanofibers were obtained from the flow rate of 0.1 ml/min, the voltage of 5 kV, and the needle tip and grounded collector of 1 cm. Polycaprolactone (PCL) is mixed with 10 wt% in chloroform solvent. Hybrid scaffold was observed by scanning electron microscopy (SEM, Tescan VEGA II LMU, Czech) for the observation of successful fabrication result. In near future, we will proceed with cell experiments and compressive test machine for the hybrid scaffold.
박대일,하성우,박성배,윤영수,Dae Il Park,MD,Sung Woo Ha,MD,Seong Bae Park,MD,Young Soo Yun,MD 대한안과학회 2010 대한안과학회지 Vol.51 No.1
Purpose: To analyze the effect of presence with or absent of retinopathy of prematurity (ROP) and its stage, birth weight, conceptual age and associated diseases on the axial length of premature infants’ eye. Methods: A total of 102 eyes of 51 premature infants less than 36 weeks of conceptual age were evaluated in this study. Fundus examination for ROP and axial length measurement were conducted at 40, 52 and 64 weeks of postconceptual age. The medical records were reviewed retrospectively. Independent t-test analysis, simple regression analysis, and one-way ANOVA were performed to assess the influence of each factor on axial length. Results: The mean axial length at 40, 52 and 64 weeks were 17.35, 18.80 and 19.78 mm, respectively. The mean axial length with and without ROP at 40 weeks were 17.10 mm and 17.54 mm, respectively, which were statistically significant (p=0.000). There was a significant decrease in axial length at 40 weeks in the higher ROP stage (p<0.05). Axial length and birth weight showed positive correlation with statistical significance at 40 weeks, while these parameters showed no significant correlation at 64 weeks. Axial length and conceptual age showed a positive correlation with statistical significance at 40 weeks (p=0.000), yet a negative correlation at 64 weeks with no statistical significance (p=0.306). A significant difference was not observed between sex and the associated diseases. Conclusions: The factors that affect the axial length of an infants’eye at 40 weeks were ROP and its stage, birth weight, and conceptual age. Additionally, there was no significant relationship between sex and the associated diseases. J Korean Ophthalmol Soc 2010;51(1):81-87
골 재생용 인공지지체 제작 및 평가를 위한 나노-마이크로 적층 시스템의 적용
사민우(Min-Woo Sa),하성우(Seong-Woo Ha),김종영(Jong Young Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The purpose of this study was to fabricate and evaluate various scaffolds for bone regeneration using nano-micro deposition system based on the solid free-form fabrication (SFF) technique. Nano-micro deposition system was designed to use electrospinning and fused deposition modeling (FDM). Nano-based PCL and pure β-TCP scaffolds were fabricated by nano-micro deposition system. Structure and morphology of the fabricated scaffolds were analyzed by a scanning electron microscopy (SEM). The compressive strength of the fabricated scaffolds was evaluated by calculating a slop of each stress-strain curves. The in vitro cell experiment was also carried out, in order to evaluate the cell proliferation of the fabricated scaffolds. We showed that nano-based PCL and pure β-TCP scaffolds would be a promising substrate to regenerate defected bone tissues.
세가지 형태로 변신이 가능한 비대칭 X8 무인비행로봇의 제작
정진혁(Jin-Hyuk Jeong),하성우(Seong-Woo Ha),윤병모(Byeung-Mo Yun),김경호(Kyung-Ho Kim),허경무(Kyung-Moo Huh) 제어로봇시스템학회 2014 제어·로봇·시스템학회 논문지 Vol.20 No.11
Unmanned flying robots have been used recently in many difficult situations. One of the major issues in this area is the problem of how long these unmanned flying robots can perform a given task successfully. For this, the development of a light body and high-efficiency power supply has been executed widely, but we do not as yet have the complete solution. In this paper, we propose a form of Multi-Copter X8, which can transform into other types to further improve these problems. The proposed robot has a 3-type modification capability, which can produce a more enhanced energy saving effect by reducing power consumption.
자이로센서와 가속도센서 결합을 통한 쿼드콥터의 자세 제어
윤병모(Byeung-Mo Yun),정진혁(Jin-Hyuk Jeong),하성우(Seong-Woo Ha),김경호(Kyung-Ho Kim),박진양(Jin-Yang Park) 한국컴퓨터정보학회 2013 한국컴퓨터정보학회 학술발표논문집 Vol.21 No.1
본 논문에서는 자이로 센서(Gyro Senor)와 가속도 센서(Accelerometer)를 이용하여 가속도(x")와 각 축의 각속도(x<sup>*</sup>