ㆍ
An Exploratory Study on the Structure of Fabric of Increasing Triboelectric Energy Harvesting by Applying Three-dimensional Embroidery Technique
|
양진희 Jin-hee Yang , 조현승 Hyun-seung Cho , 김민욱 Min-ook Kim , 김종백 Jong-baeg Kim , 김신혜 Shin-hye Kim , 이주현 Joo-hyeon Lee |
KJSES 21(3) 141-150, 2018 DOI : 10.14695/KJSOS.2018.21.3.141 |
ABSTRACT
The purpose of this study is to investigate three-dimensional embroidery techniques for creating conductive fabric materials. Such techniques can increase the efficiency of energy harvesting by increasing the fabric's area during rubbing and brushing. We also investigate the fabric structure of the triboelectric energy harvesting type. Two experiments were conducted for this purpose. In Experiment Ⅰ, the three-dimensional embroidery technique(satin technique, file technique) and the conductive fabric material(copper-based MPF, nickel-based MPF) were selected as the main variables affecting the efficiency of triboelectric energy harvesting from the human body. Four samples were fabricated according to a combination of two variables. In Experiment Ⅱ, the harvesters fabricated by the three-dimensional embroidery method showing the highest efficiency were subjected to brushing processes and the voltages generated after processing were analyzed. As a result, in both conductive fabric materials, the pile embroidery fabric structure showed a higher efficiency than the satin structure. These results show the triboelectric energy harvesting principle, which is proportional to the charge density and the generated voltage. It can be seen that the structure of pile embroidery fabric with a large friction area is advantageous for increasing efficiency compared to satin embroidery-fabric structure with a relatively small friction area. Moreover, the energy harvesting efficiency after brushing was higher than that before processing due to the increased friction area, and it was found that the brushing method is advantageous for increasing the triboelectric-energy harvest.
keyword : 마찰 에너지 수확, 입체 자수 기법, 직물 구조, 전도성 직물 재료, Triboelectric Energy Harvesting, Three-dimensional Embroidery Technique, Structure of Fabric, Conductive Fabric Material
|
|
Full Text
|
| PDF
|
|
ㆍ
Effects of Emotional Information on Visual Perception and Working Memory in Biological Motion
|
이한나 Hannah Lee , 김제중 Jejoong Kim |
KJSES 21(3) 151-164, 2018 DOI : 10.14695/KJSOS.2018.21.3.151 |
ABSTRACT
The appropriate interpretation of social cues is a crucial ability for everyday life. While processing socially relevant information, beyond the low-level physical features of the stimuli to emotional information is known to influence human cognition in various stages, from early perception to later high-level cognition, such as working memory (WM). However, it remains unclear how the influence of each type of emotional information on cognitive processes changes in response to what has occurred in the processing stage. Past studies have largely adopted face stimuli to address this type of research question, but we used a unique class of socially relevant motion stimuli, called biological motion (BM), which depicts various human actions and emotions with moving dots to exhibit the effects of anger, happiness, and neutral emotion on task performance in perceptual and working memory. In this study, participants determined whether two BM stimuli, sequentially presented with a delay between them (WM task) or one immediately after the other (perceptual task), were identical. The perceptual task showed that discrimination accuracies for emotional stimuli (i.e., angry and happy) were lower than those for neutral stimuli, implying that emotional information has a negative impact on early perceptual processes. Alternatively, the results of the WM task showed that the accuracy drop as the interstimulus interval increased was actually lower in emotional BM conditions than in the neutral condition, which suggests that emotional information benefited maintenance. Moreover, anger and happiness had distinct impacts on the performance of perception and WM. Our findings have significance as we provide evidence for the interaction of type of emotion and information-processing stage.
keyword : 생물형운동, 정서, 지각, 사회적 정보, 작업기억, Biological Motion, Emotion, Perception, Social Information, Working Memory
|
|
Full Text
|
| PDF
|
|
ㆍ
Development of Wearable Sensing and Feedback Product Design for Movement Monitoring
|
조현승 Hyun-seung Cho , 양진희 Jin-hee Yang , 이강휘 Kang-hwi Lee , 이정환 Jeong-hwan Lee , 박서연 Su-youn Park , 최형익 Hyeong-ik Choi , 전학수 Hak-su Jeon , 이주현 Joo-hyeon Lee |
KJSES 21(3) 165-176, 2018 DOI : 10.14695/KJSOS.2018.21.3.165 |
ABSTRACT
The objective of this study was to develop clothing-type wearable motion sensing and feedback systems to enhance children’s sports by promoting visual and audio feedback. In this study, several applications, such as fabric sensors, sportswear integrated with various types of fabric sensors, and fabric-based motion sensing module design, as well as a visual and audio feedback system for gaining a better understanding of a child’s interest in a type of exercise, were developed. An SWCNT-based stretchable fabric sensor was developed for motion sensing, and sportswear was designed using the fabric sensor that was integrated into the limbs of the garment. The sensing module was developed, and sensory performance was evaluated through a joint motion experiment for children. In addition, using the feedback system that was developed in the form of an accessory, the responses of light and sound were also examined based on the movement of the child who was wearing the sportswear prototypes. This study focused on the development and assessment of prototype designs for children's sportswear and accessory products that can help to ascertain a child’s interest in a particular exercise.
keyword : 싱글벽탄소나노튜브 기반 동작 센서, 센싱 모듈, 시·청각 피드백, 운동 흥미 유발, SWCNT-based Motion Sensor, Sensing Module, Visual and Audio Feedbacks, Derivation of Exercise Interest
|
|
Full Text
|
| PDF
|
|
|
|