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다중노즐 전기방사공정을 이용한 PCL/HA 나노섬유 제작
김지웅(Jiwoong Kim),박종하(Jongha Park),윤현(Hyun Yoon),손준곤(Jungon Son),박고은(Koeun Park),박수아(Sua Park),김완두(Wandoo Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Electrospinning is the process using electrical charge to distort a pendant droplet of polymer solution into a fine fiber to be deposited onto a target substrate. The merits of electrospinning are the fiber fabrication of small diameter and good mechanical properties. This means the nanofiber formation with high surface area to volume ratio and the ability to control pore size. Nanometer-diameter nanofibers have the potential applications of filter membranes, biomedical device, wound dressing materials, artificial organs, nanoelectronics, nano-composites, and protective clothing. To fabricate the uniform thickness and oriented morphology of PCL/HA nanofiber, multi-nozzle spinnerets were manufactured with rotatable grounded target collector in this study. We measured SEM observation, mechanical property, and contact angle of PCL/HA nanofiber.
쾌속조형시스템을 이용한 생체 조직 재생용 지지체 제작과 특성분석
김지웅(Jiwoong Kim),박고은(Koeun Park),이준희(Jun-Hee Lee),박수아(Sua Park),김완두(Wandoo Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The purpose of tissue engineering is to repair or replace damaged tissues or organs by a combination of cells, scaffold, suitable biochemical and physio-chemical factors. Among the three components, the biodegradable scaffold plays an important role in cell attachment and migration. In this study, we designed 3D porous scaffold by Rapid Prototyping (RP) system and fabricated layer-by-layer 3D structure using Polycarprolactone (PCL) - one of the most flexible biodegradable polymer. Furthermore, the physical and mechanical properties of the scaffolds were evaluated by changing the pore size and the strand diameter of the scaffold. We changed nozzle diameter (strand diameter) and strand to strand distance (pore size) to find the effect on the mechanical property of the scaffold. And the surface morphology, inner structure and storage modulus of PCL scaffold were analyzed with SEM, Micro-CT and DMA.
우창수(Changsu Woo),김완두(Wandoo Kim),최병익(Byungik Choi),이학주(Hakjoo Lee),이성훈(Seonghoon Lee),조현철(Hyunchul Jo),신외기(Waegi Shin) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The fatigue analysis and lifetime evaluation are very important in design procedure to assure the safety and reliability of the rubber components. Fatigue lifetime prediction methodology of the rubber component was proposed by incorporating the finite element analysis and fatigue damage parameter from fatigue test. Finite element analysis of 3D dumbbell specimen and rubber component were performed based on a hyper-elastic material model determined from material test. The Green-Lagrange strain at the critical location determined from the FEM was used for evaluating the fatigue damaged parameter of the natural rubber. Fatigue life of the rubber component are predicted by using the fatigue damage parameter at the critical location. Predicted fatigue lifes of the rubber component agreed fairly well the experimental fatigue lives.
우창수(Changsu Woo),김완두(Wandoo Kim),최성신(Sungshin Choi) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The material characteristics and lifetime evaluation are very important in design procedure to assure the safety and reliability of the rubber components. This paper discusses the material test and accelerated heat aging test were carried out to predict the useful life of NBR and EPDM rubber mount for compression motor which is used in refrigerator. In order to investigate the heat-aging effects on the material properties, the crosslink density, modulus at 100%, stress-strain curves were obtained from the results of uniaxial and equi-biaxial tensile test. Compression set results changes as the threshold are used for assessment of the useful life and the time to threshold value were plotted against reciprocal of absolute temperature to give the Arrhenius plot. The useful life at variable temperatures are obtained in the Arrhenius relationship
우창수(Changsu Woo),김완두(Wandoo Kim),김영길(Younggil Kim),신외기(Waegi Shin),이성훈(Seonghoon Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The fatigue analysis and lifetime evaluation are very important in design procedure to assure the safety and reliability of the rubber components. Recently, the design, analysis and evaluation technology was required to achieve the high quality, fidelity, reliability of rubber products. However, rubber manufacturing companies of our country have uesd the method of trial and error and experience in the process of a compound mixing, manufacturing and improvement of rubber properties. The objectives of this study are to establish the test methods of rubber material and to make the database of rubber material properties and to evaluate the performance of rubber components and to construct the prediction system of fatigue life. Fatigue lifetime prediction methodology of the rubber component was proposed by incorporating the finite element analysis and fatigue damage parameter from fatigue test.
윤성진,송경준,박병길,김완두,강상현,이선용,임현의,Yun, Seongjin,Song, Kyungjun,Park, Byung Kil,Kim, Wandoo,Kang, Sanghyeon,Lee, Sun Yong,Lim, Hyuneui 대한기계학회 2013 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.1 No.2
Even though global warming and humid climate have resulted in an increase of use of dehumidifiers, they are not becoming more common because of high energy consumption. Furthermore, conventional dehumidifier technology finally reaches the limit to increase energy efficiency of water collection. As an alternative, nature-inspired technology may lead to a major breakthrough in the dehumidification performance. In order to improve the efficiency of dehumidifiers, we first analyze the energy consumption of commercial dehumidifiers and then study bioinspired water collection methods adopted by Namib beetles and grass. 기후가 무덥고 습해지면서 제습기의 사용이 증가하고 있지만, 제습기의 에너지 소비가 크고, 전기제품의 사용 증가로 인하여 전력이 부족하기에 제습기의 사용이 보편화되지 못 하고 있다. 제습기술은 오랜 시간 동안 최적화된 기술로써 기존기술을 바탕으로 에너지 효율을 높이는 데에는 한계에 도달했다고 볼 수 있다. 하지만, 높은 에너지 효율, 즉 소비전력이 낮으면서 제습성능이 높은 제습기의 개발 요구가 계속되고 있고, 그 해답은 자연모사기술에서 찾을 수 있다. 이 논문에서는 상용품인 제습기의 소비전력을 분석하고 자연에서 무동력으로 공기 중의 수분을 포집하는 딱정벌레 등껍질이나 식물들로부터 영감을 얻어 에너지 효율을 증가시킬 수 있는 아이디어를 살펴보고자 한다.
우창수(Changsu Woo),김완두(Wandoo Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The fatigue analysis and lifetime evaluation are very important in design procedure to assure the safety and reliability of the rubber components. Fatigue life prediction methodology of the rubber component was proposed by incorporating the finite element analysis and fatigue damage parameter from fatigue test. Finite element analysis of 3D dumbbell specimen and engine mount rubber component were performed based on a hyper-elastic material model determined from material test. The Green-Lagrange strain at the critical location determined from the FEM was used for evaluating the fatigue damaged parameter of the natural rubber. Fatigue life of the rubber component are predicted by using the fatigue damage parameter at the critical location. Predicted fatigue lifes of engine mount rubber component agreed fairly well the experimental fatigue lives.