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이대웅,오소형,임대현,정회범,유승을,구영모,박권필,Lee, Daewoong,Lim, Daehyun,Oh, Sohyeong,Chung, Hoi-Bum,Yoo, Seung-Eul,Ku, Young-Mo,Park, Kwonpil 한국화학공학회 2020 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.58 No.2
In the proton exchange membrane fuel cells (PEMFC), the development of a reinforced membrane with improved durability by a support is actively in progress in Korea. In this study, the initial performance and characteristics of four types of reinforced membranes were compared. Reinforced membranes with higher amounts of C-F chains in the polymer membrane showed lower water diffusion coefficients due to the hydrophobicity of the C-F chains. The thicker the polymer membrane, the more the hydrogen permeability decreased and the higher the OCV. Membrane with short resistance below 1.5 Ωcm<sup>2</sup> showed OCV below 0.9 V and the lowest performance, so short resistance should be above 3.0 Ωcm<sup>2</sup>. Compared with the current standard membrane, there was a similar domestic membrane, which could confirm the possibility of localization of PEMFC polymer membrane. 고분자전해질 연료전지(PEMFC)에서 지지체에 의해 내구성을 향상시킨 강화막(Reinforced Membrane)의 개발이 국내에서 활발히 진행되고 있다. 본 연구에서는 4 종류의 강화막의 초기 성능 및 특성을 비교하였다. 고분자막의 C-F사슬의 양이 더 많은 강화막이 C-F사슬의 소수성 때문에 물 확산계수가 더 작음을 보였다. 고분자막 두께가 두꺼울수록 수소투과도가 감소하고 OCV가 증가함을 확인하였다. Short 저항이 1.5 Ωcm<sup>2</sup> 이하인 막은 OCV가 0.9 V이하이고 성능도 최저여서 Short 저항이 3.0 Ωcm<sup>2</sup> 이상이어야 함을 보였다. 현재 기준이 되는 국외 막과 비교했을 때 비슷한 국내 막도 있어서 PEMFC 고분자막의 국산화 가능성을 확인할 수 있었다.
Virtual Reality 콘텐츠 제작 유형이 고객 만족에 미치는 영향
이동선 ( Lee Dongseon ),임대현 ( Lim Daehyun ),김경환 ( Kim Kyonghwan ),최정일 ( Choi Jeongil ) 한국품질경영학회 2020 품질경영학회지 Vol.48 No.3
Purpose: The purpose of this study is to investigate how the type of virtual reality content production affects the interaction and immersion that is a virtual reality characteristic, and to provide the platform companies and content producers with the basic information necessary to provide the production and service of content suitable for VR characteristics. Methods: Based on the data collected in the survey, multiple regression analysis and hierarchical regression analysis were used. The measurement tools used in this study were studied through three-dimensional composition, including the characteristics and interaction and immersion of content produced in 2D, 3D and 360°, which are elements of virtual reality characteristics. Results: The results of this study are as follows. Among the types of content production, content produced with 2D and 360 technologies was found to affect immersion, while content produced in 3D affected interaction. Motion sickness has been investigated to affect both immersion and interaction. Conclusion: Service-provided platform enterprises and content-making enterprises should consider content- making and providing services that suit service characteristics and purposes, taking into account the characteristics of interaction and immersion in content-making investment and service delivery.
한혁섭(Houkseop Han),임대현(Daehyun Lim),김진용(Jinyong Kim),이영원(Young-won Lee),박성한(Sunghan Park) 한국추진공학회 2016 한국추진공학회지 Vol.20 No.1
The purpose of the pyro-shock compliant joint is to isolated vibration using the compliant material in order to prevent the shock generated by pyro propulsion at the electronics equipment. The performance of the pyro-shock compliant joint can be determined by measuring bending natural frequency and transmissibility. In this study, we established the design requirements based on bending natural frequency and transmissibility results of the reference model. We developed a compliant material with sufficient shock compliant properties and a pyro-shock compliant joint for the new rocket. This results can be used to develop a pyro-shock compliant joint for any rocket using the compliant material and performance measurement.
한혁섭(Houkseop Han),임대현(Daehyun Lim),김진용(Jinyong Kim),이영원(Young-won Lee),박성한(Sunghan Park) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.5
연소충격완화부품은 완화소재를 사용하여 진동을 격리함으로써 유도로켓 전자장비가 추진기관 연소로 발생한 충격을 방지하는 것을 목적으로 한다. 연소충격완화부품의 성능은 1차 굽힘 고유진동수와 전달률을 측정하여 판단할 수 있다. 본 연구를 통해 해외 사례를 통한 기준 모델의 실험 결과를 바탕으로 1차 굽힘 고유진동수와 전달률에 대한 설계요구조건을 수립하였으며, 충분한 충격완화특성을 가지는 완화소재를 개발하여 새로운 유도 로켓에 적합한 연소충격완화부품을 개발하였다. 본 연구는 완화소재 및 성능 측정 방법을 이용하여 유도 로켓에 적합한 연소충격완화부품을 개발하기 위해 사용할 수 있다. The purpose of the pyro-shock compliant joint is isolated vibration using the compliant material in order to prevent the shock generated by pyro propulsion at the guided rocket electronics equipment. The performance of the pyro-shock compliant joint can be determined by measuring the first bending natural frequency and transmissibility. In this study, we established the design requirements on the first bending natural frequency and transmissibility results of the reference model. We developed a compliant material with sufficient shock compliant properties and a pyro-shock compliant joint for the new rocket. This results can be used to develop a pyro-shock compliant joint for any rocket using the compliant material and performance measurement.
고분자연료전지에 사용되는 e-PTFE 지지체의 펜톤반응 후 화학적 열화
오소형 ( Sohyeong Oh ),임대현 ( Daehyun Lim ),이무석 ( Mooseok Lee ),이동훈 ( Donghoon Lee ),박권필 ( Kwonpil Park ) 한국화학공학회 2020 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.58 No.4
The support of the PEMFC membrane plays a key role in improving mechanical durability. The e-PTFE used as a support is chemically stable, so electro-chemical degradation in the PEMFC driving process has been rarely studied. In this study, we investigated whether e-PTFE is chemically stable to radicals and hydrogen peroxide during Fenton reaction. After the Fenton reaction, the main chain of e-PTFE broke, resulting in a change in the chemical structure and morphology of the support, resulting in a decrease in tensile strength. The results of this study showed that electrochemical degradation of the membrane ionomer in the PEMFC process occurs inside the membrane by radicals and hydrogen peroxide, so that electrochemical degradation may also occur at the e-PTFE support in the cell.
Al(OH)<SUB>3</SUB>와 Sb<SUB>2</SUB>O<SUB>3</SUB>의 첨가에 따른 EPDM계 고무의 난연성 향상 연구
김진용(Jinyong Kim),이원복(Wonbok Lee),임대현(Daehyun Lim),서혁(Hyuk Suh),이영우(Youngwoo Rhee) 한국추진공학회 2009 한국추진공학회 학술대회논문집 Vol.2009 No.11
EPDM(Ethylene-propylene diene monomer)계 고무의 난연성 향상을 위하여 무기계 난연재료인 Al(OH)3와 Sb2O3를 첨가하여 물성 및 열적 특성을 조사하였다. 각 시편의 물성은 큰 차이를 보이지 않았으나, 난연재료의 함량이 증가할 수 록 비중과 경도는 높아지는 반면에 신율은 낮아지는 경향이 있었다. 본 연구에서는 열분석과 난연성 시험을 실시하였고, 결과적으로 난연재료의 함량이 10phr 이상에서는 난연 효과가 확연히 나타나는 것으로 판단되었다. In order to improve incombustibility of EPDM(Ethylene propylene diene monomer)-based rubber, inorganic materials as Al(OH)3 and Sb2O3 were added. The mechanical and thermal properties have been measured for vulcanized rubber loaded with different concentrations of Al(OH)3 and Sb2O3. As inorganic material contents increases from 5phr to 30phr, the specific gravity and hardness increase while elongation at break decreases. This study performed incombustibility test and thermal analysis through TGA(Thermogravimetric Analyzer). As a results, incombustible and thermal properties of EPDM-based rubber were improved as Al(OH)3 and Sb2O3 contents increase.