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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.
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.
원자력발전소 비상전력계통 강화 방안에 따른 리스크 영향 평가
전호준 ( Ho Jun Jeon ) 한국안전학회(구 한국산업안전학회) 2012 한국안전학회지 Vol.27 No.5
Power Supply (EPS) system has been considered as one of the most important safety system. Especially, the interests in the reliability of the EPS system have been increased after the severe accidents of Fukushima Daiichi. Firstly, we performed the risk assessment and the importance analysis of the EPS system based on the PSA models of the reference plant, which is the Korean standard NPP type. Considering a portable Diesel Generator (DG) system as the reliability reinforcement of the EPS system, we modified the PSA models and performed the risk impact assessment and the importance analysis. Although the reliability of the potable DG could be about 20% of the reliability of the alternative AC DG, we identified that Core Damage Frequency (CDF) was decreased by at least 4.6%. In addition, the risk impacts due to the unavailability of the EPS system on CDF were decreased.
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.
인간/시스템안전분야 : MACCS II 코드를 이용한 국내 경수로 및 중수로형 원전의 소외결말분석
전호준 ( Ho Jun Jeon ),지문구 ( Moon Goo Chi ),황석원 ( Seok Won Hwang ) 한국안전학회(구 한국산업안전학회) 2011 한국안전학회지 Vol.26 No.5
Since a severe accident, which happens in low frequency, can cause serious damages, the interests in off- site consequence analysis for a nuclear power plant have been increased after Chernobyl, TMI and Fukushima accidents. Consequences, which are the effects on health and environment caused by released radioisotopes, are evaluated using MACCS II code based on the method of Level 3 PSA. To perform a consequence analysis for the reference plants, the input data of the code were generated such as meteorological data, population distribution, release fractions, and so on. Using these input data, acute and lifetime dose as an organ, CCDF for early fatalities and latent cancer fatalities, and average individual risk were analyzed by using MACCS II code in this study. These results might contribute to establishing accident management plan and quantitative health object.
젖소 결핵 검진시 유량 및 유질 변화에 영향을 주는 환경 요인들에 대한 조사
구경녀 ( Kyung-nyer Ku ),전호준 ( Ho-jun Jeon ),김효준 ( Hyo-jun Kim ),정준용 ( Jun-yong Jeong ) 한국동물위생학회(구 한국가축위생학회) 2018 韓國家畜衛生學會誌 Vol.41 No.2
This study was conducted to evaluate the effect of tuberculin test and associated various environmental factors on the quantity and quality of milk production of daily cows. The change of milk quantity followed to tuberculin test was investigated on 109 daily farms in south Gyeonggi, and the change of milk quality was also studied on 48 daily farms. The result of this study showed that the quantity and quality of milk production was decreased after tuberculin test (P<0.05). The amount of loss of the milk production due to tuberculin test was, however, only 0.92 L per cow. In terms of milk quality, the level of total protein was statistically significantly decreased. This study also showed that the milk quality was further decreased when the cows were restraint after veterinarians arrived compared to the case that cows were stayed restraint before the veterinarians visited the farm. In addition, milk quality and quantity were lowered worse when relative humidity of the location of tuberculin test was lower than 50% or higher than 70%, or when the milk production of a farm is higher than its quarter. This study showed that stress on daily cows and the farmers induces the decrease of milk yield and milk quality, and these losses can be minimized by regulating various environmental factors to the direction to maximize productivity.
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.
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.