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유전체 및 전극의 특성에 따른 정전용량형 Textile Keyboard의 성능변화에 관한 연구
방주엽,이효정,최세진,민문홍,이창헌,김한성,Bang, Ju Yup,Lee, Hyo Jung,Choi, Sejin,Min, Moon Hong,Lee, Chang Heon,Kim, Han Seong 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.1
In recent years, mobile devices have become indispensable devices for everyday life. However, the types and technologies of mobile devices that are soft and easy to carry are not sufficient. It is urgently necessary to develop and disseminate supplementary measures to improve their communication as part of securing the equal rights of disabled people to social members. In order to address the gap between disabled and non-disabled people in terms of utilization of information and communication technology and to improve the smart mobile usage environment, this study aimed to develop an alternative means. The Braille keyboard for the visually impaired developed in the fabric form exhibited a good signal-to-noise ratio value of 41.14 when a P40 insulation layer was inserted between two conductive layers. This is because there is a factor due to the difference in permittivity, and the change in the distance between the conductive layers due to the applied load is greatest.
전도성 방적사 및 필라멘트사를 이용한 섬유형 전극 정전용량형 터치 센서의 성능 비교 연구
최세진,방주엽,민문홍,이창헌,김한성,Choi, Sejin,Bang, Ju Yup,Min, Moon Hong,Lee, Chang Heon,Kim, Han Seong 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.6
With the rapid growth of the Internet of things in the recent years, smart textile technologies have correspondingly attracted significant research attention in the industry. One important elementary technology being considered for smart textiles is a touch sensor input device to enable direct communication between users and other electronic devices. This study investigated the effect of the structural difference in conducting fibers on the sensing property of capacitive textile touch sensors. Conducting fibers made of stainless steel spun yarns and filaments used for electrodes presented different changes in electrical resistance with the application of tensile and compressive forces. It is believed that the different structures between spun yarns and filaments induced difference in the electric contact among their constituent fibers with the application of an external force. Moreover, the random deformation of staple fibers resulted in the unstable change of capacitance and large hysteresis, while a stable performance and low hysteresis was observed for textile sensors with filaments.
공창숙,방주엽,김한성,Kong, Chang Suk,Bang, Ju Yup,Kim, Han Seong 한국섬유공학회 2013 한국섬유공학회지 Vol.50 No.2
Since the mid-twenties, various researches have been conducted with a focus on decreasing air pollution. In recent years, many researchers have investigated the multifunctional filtration method with the aim of developing an efficient filter. One of the notable experiments conducted involves electrospraying materials onto nonwoven fabric. In this project, we electrosprayed an enzyme-incubated aqueous solution that contains a water-soluble acrylic binder extracted from kimchi and studied its drop, jet, discharge current, and jet velocity.
편광분석을 이용한 2차원 위상지연 분포 측정과 ABF 필름의 공정 최적화에 관한 연구
이대희,최세진,방주엽,김동진,김한성,Lee, Dae Hee,Choi, Se Jin,Bang, Ju Yup,Kim, Dong Jin,Kim, Han Seong 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.1
Polarimetry is a non-destructive technique that measures the degree of rotation of polarized light passing through an optically active material. Optical activity is determined by various factors, including intrinsic optical properties and residual stress. Thus, polarimetry can be used in various fields. In this study, polarimetry was used to evaluate the two-dimensional spatial uniformity of optical birefringence in an Ajinomoto build-up film. This analysis can predict the optimal cure condtitions of the film, which creates a uniform phase retardation distribution.
전극 일체형 polyvinylidene difluoride(PVDF) 압전 섬유에 관한 연구
이세영,김슬비,최세진,방주엽,김한성,Lee, Se Young,Kim, Seul Bi,Choi, Se Jin,Bang, Ju Yup,Kim, Han Seong 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.4
Polyvinylidene difluoride solution dip-coating and a high-voltage poling process is effective at inducing chain reorientation and phase transformation. Moreover, a copper wire external electrode and coated fiber combined to form a piezoelectric device successfully. In addition, a textile-like piezoelectric device comprising of three warps and one weft was fabricated, and the piezoelectric properties of the device were evaluated. The voltage from the polyvinylidene difluoride fiber was increased as the external force was applied. The piezoelectric performance was affected by the presence of external load resistors. Moreover, in the case of the textile-type piezoelectric device, the more warps and weft were connected to each other, the higher was the voltage generated. Consequently, single fiber can be used for piezoelectric devices, moreover, it enables advanced users to have wide application, for example, woven or knitted smart textile-type sensors or micro energy harvesters.