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김혜림,이선희,Kim, Hyelim,Lee, Sunhee 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.2
The main objective of this study was to develop improved functional textiles for marine leisure clothing. Neoprene fabrics were coated with carbon nanofibers (CNFs)/Poly(vinylidenefluoride-co-hexafluoropropylene) (PVDF-HFP) composite solution comprising 0-16 wt% CNF in 1-5 wt% PVDF-HFP via electrospinning. Electrospinning was carried out from 15 to 24 kV. Neoprene textiles coated with the CNF/PVDF-HFP composite with various applied voltages were characterized as follows: Morphology was examined using an image analyzer microscope system and a field emission scanning electron microscope (FE-SEM). The thermal storage property of these materials was also analyzed using a thermal imaging camera with a forward looking infrared (FLIR) system. The resultant samples that were laminated with a knitted fabric composed of 80% nylon and 20% polyurethane were subjected to a thermal insulation property test. The test and control specimens were irradiated for 60 min. The test specimen and the control specimen were analyzed by considering the differences in temperature between both specimens on heating. Water penetration resistance of the laminated knitted fabric with the CNF/PVDF-HFP composite nanoweb-coated neoprene fabric was measured. The water repellent property test was conducted using a drop shape analyzer (DE/DSA 100, Kruse). The results indicated that an increase in the density of nanoweb-coated neoprene fabric surface correlated with improved thermal storage, thermal insulation, water penetration resistance, and water repellent properties. In addition, increasing amounts of CNFs in the CNFs/PVDF-HFP composite solution resulted in increased thermal storage, thermal insulation, and water repellent properties.
김혜림,방윤혁,이선희,Kim, Hyelim,Bang, Yunhyuk,Lee, Sunhee 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.4
In this study, we evaluated the thermal insulation of different materials and characterized these materials for commercial wetsuits. The performance characteristics of three different wetsuit materials were examined. Parts of the wetsuit including the neck, bodice, and knee were prepared. Surface morphology was examined using an image analyzer microscope system. In the tensile test, the load, elongation, and initial modulus were obtained for the different wetsuit materials. To investigate the thermal insulation property of wetsuits, we assessed the differences in surface temperatures by a heat storage test method. The thermal resistance was estimated by heat flux experiments on a thermal mannequin, exposed to $20^{\circ}C$, to obtain the thermal insulation of the different wetsuit materials under study.
그래핀/WPU 복합체 코팅 면적에 따른 전기 발열 텍스타일의 특성에 관한 연구
김혜림,이선희,Kim, Hyelim,Lee, Sunhee 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.5
In this study, a graphene/waterborne polyurethane (WPU) composite solution was coated on cotton and polyester fabrics with various coating areas to examine their applications in electrical heating fabrics for use in various areas. The graphene/WPU composites were prepared with 25 wt% WPU, and 0, 4, 8, and 16 wt% graphene. The graphene/WPU composite was coated on cotton and polyethylene terephthalate (PET) fabrics with a double plane using the knife-edge method. Fabric heating elements were fabricated with dimensions of $10.0cm{\times}10.0cm$, $7.5cm{\times}7.5cm$, $5.0cm{\times}5.0cm$, and $2.5cm{\times}2.5cm$, respectively, so that they could be applied in a variety of applications after coating. On examining the morphology, it was found that, as the content of the graphene increased, the surface of the coated fabric became smooth and uniform. The surface resistivity increased as the graphene contents increased and slightly increased with decreasing coating area. The surface temperature of the 16 wt% graphene/WPU composite coated on the fabric heating elements of $10.0cm{\times}10.0cm$ and $2.5cm{\times}2.5cm$ area on cotton were 24.5 and $52.3^{\circ}C$, respectively, and on PET fabrics 33.2 and $78.3^{\circ}C$, respectively. It was confirmed that the electrical heating properties were improved because the friction of the moving charge increased as the area of the samples decreased.
연신 조건에 따른 그래핀/PVDF-HFP 복합 필름의 미세구조 및 물성 분석
김혜림,이선희,Kim, Hyelim,Lee, Sunhee 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.2
Graphene/poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP) composite films were prepared by the solution casting method. The resultant 2 wt% graphene/ PVDF-HFP composite films were uniaxially drawn at $50^{\circ}C$, $75^{\circ}C$, and $100^{\circ}C$. Investigation of the surface morphology of these films confirmed that the orientation of the polymer matrix. The XRD results showed ${\alpha}$-phase crystals. With increasing drawing temperature, the (002) reflections of graphene decreased and the (100) and (020) planes of the ${\alpha}$-phase of PVDF-HFP increased. DSC thermograms indicated no change in the melting temperature but a slight increase in crystallinity with increasing drawing temperatures. The surface resistivity of the graphene/PVDF-HFP composite films in the case of $75^{\circ}C$ drawing temperature were slightly lower than those in the case of the other two temperatures.
김혜림 ( Hyelim Kim ) 세계음악학회 2016 음악과 문화 Vol.35 No.-
본 연구는 한국전통음악의 현대적 창작 중에서도 재즈와의 협업과정을 중심으로 논의한다. 특히 창작에 참여하는 연주자, 작곡가 그리고 청중이 대면하게 되는 문화적 및 사회적 관계를 살펴보기 위하여 극작가 리차드 세크너의 ‘공연이론 (Performance Theory)’을 이용하여 분석한다. ‘공연이론’을 통해 한국전통음악과 재즈의 만남을 음악적 뿐만아니라 사회적 문맥에서 살펴 보게 된다. 본문에서는 재즈와 한국전통음악의 협업의 예로 본인이 호주 출신재즈 연주가 사이먼 바커 (Simon Barker)와 함께 진행한 작업 ‘허튼가락 (Scattering Rhythms)’을 중심으로 접근하였다. ‘공연이론’을 토대로한 분석에 덧붙여 본인의 연주 앨범인 대금 연주곡 ‘님 (2013)’과 영국 BBC 방송국이 제작하는 월드뮤직전문 프로그램 ‘Late Junction’에서 녹음한 시청각적 자료로 덧붙여 새로운 공연예술로서의 거듭나는 한국음악의 미래를 다루어 보고자 한다.
고에너지 금속 연료를 이용한 Fuel-Rich 추진제 개발
김혜림(Hyelim Kim),신경훈(Kyung-Hoon Shin),최성한(Sunghan Choi),이원복(Wonbok Lee),김준형(Junhyung Kim),고승원(Seung Won Ko) 한국추진공학회 2012 한국추진공학회 학술대회논문집 Vol.2012 No.5
공기흡입형 추진기관은 운용의 단순함, 저비용, 저장의 용이성 등의 장점으로 각광받고 있는 추진 기관이다. 본 논문에서는 Boron을 이용한 공기흡입형 추진기관의 가스발생기에 사용될 추진제 연구를 수행하였다. 이를 위하여, Amorphous Boron Powder를 적용한 추진제에 다양한 첨가제를 사용하여 연소 특성을 파악하였고, Boron bead를 제조하여 추진제에 적용하여 Amorphous Boron Power를 적용한 추진제와의 차이점을 비교 분석 하였다. Air-breathing Propulsion System is one of the promising propulsion systems because of low cost, easy storage, compactness and simplicity. A study of gas generator propellant for air-breathing propulsion system was performed in this paper. Amorphous Boron Powder was applied in propellant with various kinds of additives to determine combustion characteristics. And boron beads were made to apply them to the propellant. Combustion characteristics of propellant using amorphous boron powder and boron beads was compared.
3D 프린팅 Auxetic Re-entrant 패턴의 기울기 각도에 따른 네오프렌 복합 직물의 역학적 특성에 관한 연구
김혜림 ( Hyelim Kim ),카비르샤흐바지 ( Shahbaj Kabir ),이선희 ( Sunhee Lee ) 한국의류학회 2021 한국의류학회지 Vol.45 No.1
This study confirmed the mechanical properties of an auxetic re-entrant pattern prepared using 3D printing technology and its composite fabric with neoprene for the production of functional auxetic patterns/textiles for safety shoes. Samples were prepared by the tilt angle of a re-entrant pattern of 0°, 30°, 45°, 60° and 90°, and then analyzed using Poisson's ratio, bending, compression, and tensile properties. A 3D printed auxetic re-entrant pattern (3DP-RE) and its composite fabric (3DP-RE/NP) showed a negative Poisson's ratio in all tilting angles that indicated auxetic properties. The results of the bending property shown that strength of 3DP-RE/NP was 1.5 times lower than NP, but the strain improved 2.0 times. It was confirmed that the deformation of 3DP-RE/NP is possible with a low load. Each sample type of compression behavior indicated similar regardless of the tilting angles; in addition, the compression toughness of 3DP-RE/NP increased 1.2 times compared with NP. In the case of tensile properties, 3DP-RE and 3DP-RE/NP were affected by the tilting angle, samples with 90° (the opposite of load direction) showed best tensile property and toughness. 3DP-RE/NP indicated improved bending, compression, and tensile properties.