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.

나노웹으로 코팅된 네오프렌 직물의 제조 및 특성분석

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.

시판 습식방수복의 부위별 소재 특성 및 보온성 평가

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.

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.

해외 수소충전소 설계 및 운영 가이드라인

김혜림(Hyelim Kim),강승규(Seungkyu Kang),허윤실(Yunsil Huh),문종삼(JongSam Moon) 한국신재생에너지학회 2017 한국신재생에너지학회 학술대회논문집 Vol.2017 No.9

소통을 위한 몸짓 - 농음의 문화상호적 해석 -

김혜림 ( Hyelim Kim ) 한국공연문화학회(구 한국고전희곡학회) 2016 공연문화연구 Vol.0 No.33

한국의 전통악기, 대금은 악기의 특이한 음색과 다양한 기법으로 한국의 고유한 아름다움을 전하면서 동시에 국제적으로 관심을 받고 있다. 대금 연주가 및 음악인류학 연구자로서 활동하고 있는 본인은 대금 연주를 통해 클래식, 동아시아 음악, 전자 음악, 재즈 등 다양한 배경을 가진 연주가들과 한국 외 세계 여러 곳에서 협업을 진행해 왔다. 공연을 기반으로 한 협업은 음악간의 문화적 간극을 극복하고자 한 빅토르 터너 (Victor Turner)가 주장한 ‘다문화적 퍼포먼스 (Intercultural Performances)’를 지향하는 연구 주제와 병행하여 진행되었다. 본 연구는 그 중의 한 예로서 한국 전통 음악과 클래식 음악의 협업을 기반으로 한 공연 연구이다. 본 연구의 분석 대상은 본인이 한국의 저명한 작곡가 김대성(1967년생)에게 위촉한 대금과 서양 악기를 위한 두 곡, ‘님’과 ‘청’을 기반으로 이루어져 있다. 협업 내용은 리차드 셰크너 (Richard Schechner)의 공연 이론 (Performance Theory)을 기반으로 음악 인류학 및 공연 연구의 핵심적인 문제를 다루고 있다. 본 공연 연구의 목적을 두 가지로 나눌 수 있다. 첫번째, 대금의 현대화 과정을 클래식 음악의 문맥 안에서 구체적으로 살펴 보고자 한다. 두번째, 본 공연 작업은 영상과 음원 등의 자료를 이용해 분석되고 이를 마이클 텐저 (Michael Tenzer)의 ‘문화적 상대화 (Cultural Relativism)’ 개념에 적용시켜 본다. The Korean taegum, a horizontal bamboo flute, is considered a representative wind instrument of Korean traditional music. Symbolized by its unique timbre and diverse techniques, this instrument transmits the beauty of Korea, and has become acknowledged even in international music scenes. Being a taegum player, composer, and ethnomusicology researcher, I have developed creative collaborations with musicians from Asian, electro-acoustic, jazz, and Western art music traditions developed outside my country of origin and tried to overcome musical boundaries through the ``intercultural performances`` (after Turner 1988). Zooming in one collaboration, I detail the process of music creation and performance, collaborating with prominent Korean composer Kim Taesong (b.1967), who was commissioned by myself to write two compositions for the taegum and Western art music. The purpose is twofold: firstly, the modernization and appropriation of the Korean flute is briefly tracked down within the context of Western Art music. Secondly, a performance project is illustrated with the support of technical apparatuses such as DVD and CD recordings and delves further into the question of the ``cultural relativism`` (Michael Tenzer, 2006: 7) through the interactive process. The performance-as-research, as a tool ``actualizing`` (Richard Schechner 2003: 32) the hybridity, touches on critical domains in Ethnomusicology. The corresponding two parts discover, as Alan Merriam``s(1964) ``tripartite model`` suggests, the ``context`` of Korean and Western cultures, the ``behaviour`` of collaborating and performing and the ``sound`` of improvised and composed productions in the course of music making.

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.

국내 · 외 충전소 사고 현황 분석 및 가스누출 피해거리 평가

김혜림(Hyelim Kim),강승규(SeungKyu Kang),허윤실(YunSil Huh) 한국에너지학회 2017 에너지공학 Vol.26 No.4

국제표준협력 기반구축 방안에 관한 연구

김혜림(Hyelim Kim),강승규(SeungKyu Kang) 한국가스학회 2022 한국가스학회 학술대회논문집 Vol.2022 No.5

Sounding Rocket용 고성능 추진제 조성연구

김혜림(Hyelim Kim),원종웅(Jongung Won),최성한(Seonghan Choi),이원복(Wonbok Lee) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.5

본 연구에서는 관측로켓에 적용 가능한 고성능 추진제 조성개발에 대해 연구하였다. 관측로켓은 다양한 대기권영역에서 관측하기 위해 여러 단을 구성할 수 있는 로켓을 개발을 필요로 하고 있다. 본 연구에서는 2단으로 구성된 관측로켓을 기본으로 HTPB/AP 계열의 조성을 기본으로 설정하였다. 화학평형계산기(CEA) code와 내탄도 해석의 이론적인 성능해석을 통한 고성능 추진제 개발 가능성을 입증하였고, 1G/L mixer를 이용하여 조성시험을 실시하여 제작한 시편으로 instron tensile tester와 strand burner를 이용하여 추진제의 기계적 특성과 연소속도를 확인하였다. 최종적으로는 6inch급의 표준모타를 제작, 지상연소시험을 통하여 고성능 추진제 개발 가능성을 확인한다. In this study, applicable to Sounding Rocket about the development of high-performance propellant was studied. Sounding Rocket requires generally multistage rocket system for atmospheric research. This study describes the development of two types solid propellant compositions which are based on HTPB/AP for the two-stage rocket. CEA code of NASA and internal ballistic analysis were used for confirming the theoretical performance of designed propellants. The strand burner and JANNAF tensile test was used to measure ballistic and mechanical properties of designed propellants. Finally, static fired test of standard motors was performed to prove the possibility of development.