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초발수성 식물표면에 존재하는 마이크로/나노구조 복제를 위한 전기장을 이용한 나노임프린팅 방법
전호준(HoJun Jeon),진규현(Gyuhyon Jin),윤현(Hyeon Yoon),김근형(GeunHyung Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The technologies to fabricate micro/nano-patterned surface, such as electron beam lithography and nanoimprinting techniques, have been investigated several years. However, the nano-imprinting technology requiring high pressure during the process is not affordable to replicate micro/nano-surface of plant leaf due to the low stiffness of the leaf. In this study, we researched new technology to produce the hydrophobic nature of plant leaves on the surface of polydimethylsiloxane (PDMS). The micro/nano-patterned PDMS was fabricated by means of field-aided nano-imprint lithography (FA-NIL) technique. By varying the processing conditions of FA-NIT, we could obtain an optimized processing condition to attain hydrophobic surface of lotus leaf. The surface of the replicated PDMS was characterized using a scanning electron microscope (SEM) and surface roughness apparatus. We find that FA-NIL might be a good method to generate the soft micro/nano size structures, plant leaf.
압전기(PZT)가 결합된 플러팅 시스템을 이용한 3차원 PCL 지지체 제작
전호준(Hojun Jeon),고석진(Sukjin Ko),윤현(Hyeon Yoon),안승현(SeungHyun Ahn),김근형(GeunHyung Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The RP can provide great control of the internal features of a scaffold, the resolution and minimum feature size are usually constrained by processing parameters and material properties. Recently, a flow in the small-sized nozzle of the plotting system should be required along smoothly to obtain small-sized polymer strand of the 3D scaffold. To attain the stable flow in small-sized nozzle, we adapted a PZT system to the melt-plotting RP system. The effects of the various amplitude and frequencies were investigated in respect of the strand size and the fabricated scaffolds were characterized in mechanical properties. The scaffold of aided PZT system had higher mechanical properties than normal plotting system due to the inducement of molecular orientation of the strand by the vibrating system. From these results, we can convince that this technique is a feasible new method for fabricating high-quality 3D polymeric scaffolds.
플라즈마 애칭을 이용한 나노 표면 구조를 가지는 마이크로 파이버 제작
전호준(HoJun Jeon),안승현(SeungHyun Ahn),이형진(Hyeongjin Lee),여명구(MyungGu Yeo),김용복(YongBok Kim),김민성(Min Seong Kim),이경호(KyoungHo Lee),김근형(GeunHyung Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
In a recent study, a hierarchical structure of coexistent nano- and microstructures induced high cellular activities, such as proliferation and differentiation. In this study, an easy and versatile method of generating a nano-sized patterned surface on a nonwoven mat of electrospun poly(e-caprolactone) (PCL) fibers is described. A hierarchical structured pattern could be achieved on the surface of the PCL fiber coated with collagen solution using a modified plasma-treatment method with nano-sized template (800 nm). This new type of plasma-treated PCL fiber mat has high potential as a biomaterial, and can be employed for various tissue engineering applications.
양길태(Giltae Yang),전호준(Hojun Jeon),전성표(Jun sung pyo),유원호(Yu Won Ho),심재륜(Shim Jae Ryun) 대한인간공학회 2021 대한인간공학회 학술대회논문집 Vol.2021 No.11
Objective: 보행분석에 사용되는 기술들은 다양한 기법들이 개발되어 있으나, 외부에서 장시간 사용 가능한 방법은 매우 제한된 방법들이 제안되고 있다. 본 연구에서는 압력센서와 가속도센서 자이로센서가 내장된 스마트 인솔을 개발 하였으며, 개발된 스마트 인솔은 실시간으로 스마트폰과 연동되어 데이터를 전송하고, 분석하도록 되어 있다. 일상생활에서의 비정상 보행, 비대칭 보행을 하고 있는 사람들은 자신이 인지 할 수 있을 만큼 그 문제의 정도가 심각하지 않은 상태라면, 그 사실을 모른 채 생활한다. 이는 향후 큰 질병이 발생하는 요인이 될 수 있다. 본 연구에서는 개발된 스마트 인솔을 통해 각 발의 압력 데이터를 수집하여 미리 정의한 정상 보행 시 나타나는 압력 분포를 기준으로 비 정상 보행 여부를 판단하고 TUG(Time Up Go) 실험을 통해 사용자의 신체 나이를 판단하는 근거로 사용하고자 하였다. 일상생활에서의 스마트 인솔 사용은 시간과 공간의 제약이 없는 사용자 친화적이면서 비정상 보행 판단 및 사용자의 신체 나이를 판단하는 근거로 활용되기를 기대한다.
가교 공정을 통한 세포 함유 알지네이트 세포담채 제작 기법
안승현(SeungHyun Ahn),전호준(HoJun Jeon),이형진(Hyeongjin Lee),김용복(YongBok Kim),여명구(MyungGu Yeo),김민성(Minseong Kim),이경호(KyoungHo Lee),김근형(GeunHyung Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
In this study, we propose a new cell-laden process consisting of a dispensing method and a new cross-linking method. A new cell-printed scaffold consisting of cell-embedded alginate struts is designed. The alginate struts are stacked in an interdigitated pattern in successive layers to acquire a three-dimensional (3D) shape. To show the feasibility of the method, we used osteoblasts-like cells. Based on these optimized process conditions, we successfully fabricated a threedimensional, pore structured, cell-laden alginate scaffold. During long cell culture periods, the osteoblasts-like cells in the alginate scaffold survived and proliferated well.
김예슬(YeSeul Kim),김민성(Minseong Kim),전호준(Hojun Jeon),김용복(YongBok Kim),이형진(Hyeongjin Lee),황헌(Heon Hwang),조재열(JaeYoul Cho),김근형(GeunHyung Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The inherent properties of nanosized silica (sil), such as high biocompatibility, chemical and colloidal stability, and easy surface modification, have provided silica materials with a tremendous potential in biomedical applications. In this study, the biocomposites consisting of poly (ε-caprolactone) (PCL) and Sil fabricated by a melt-plotting/coating process can be applied as a potential scaffold for bone tissue regeneration. The pore size and strut diameter of the multi-layered biocomposites were fixed at approximately 300㎛ and 300㎛, respectively, and the morphology, hydrophilic properties, water-absorption, and mechanical strength of various compositions (1.8, 4.8, 9.4wt% of sil) in the composites were evaluated. Through the water-contact angle and water-absorption, the bio-composites displayed dramatically increased hydrophilic properties, and highly roughened surface compared to the pure PCL scaffold. The in vitro biocompatibilities (cell proliferation and mineralization) of the bio-composites wereexamined using pre-osteoblasts (MC3T3E1). Based on scanning electron microscope images, the cells were more easily adhered and grown on the surface of the bio-composites, showing enhanced mineral deposition compared to the pure PCL scaffold after 14 days of cell culture. These results were because the coated sil component in the bio-composites could induce the osteogensis of the composites. Based on the physical and biological activities, we believe that the biocomposite will be a potential biomaterial for enhancing bone tissue regeneration.
골 조직 재생을 위한 전기수력학적 공정을 이용한 섬유구조의 PCL/ceramic 세포담체 제작
김민성(Minseong Kim),이형진(Hyeongjin Lee),전호준(HoJun Jeon),여명구(MyungGu Yeo),김용복(YongBok Kim),양지훈(Gi-Hoon Yang),김원진(WonJin Kim),김근형(GeunHyung Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
In this study, we fabricated a new ceramic fibrous scaffold, using the initial jet of an electrospinning process and ethanol media as a target. The fabricated three-dimensional (3D) fibrous ceramic structure was configured with multilayered micro-sized struts consisting of randomly entangled micro/nanofibrous architecture, similar to that of native extracellular matrixes (ECMs). The fabrication of the ceramic structure was highly dependent on various processing parameters, such as the surface tension of the target media, and the flow rate and weight fraction of the polymer solution. As a tissue regenerative material, the 3D fibrous ceramic scaffold was cultured with pre-osteoblasts to observe the initial cellular activities in comparison with a solid freeform fabricated 3D scaffold sharing a similar structural geometry. The micro/nanofibrous 3D fibrous ceramic strut scaffold exhibited significantly high initial cell attachment, proliferation, and viability compared to solid freeform fabricated 3D scaffold.