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자동차 시트용 Poly(trimethylene terephthalate) 스웨이드 개발
홍채환(Chaehwan Hong),정기연(Kiyeon Jeong),이성훈(Sunghoon Lee),정종호(Jongho Jeong),김진홍(Jinhong Kim),정의성(Euisung Jeong) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
New PTT(trimethylene terephthalate) non-wovwn suede is manufactured via the combination of an advanced spinning process (producing very low denier bi-component "islands in the sea" fibre) and chemical and textile production processes (needle punching, buffing, impregnation, extraction, finishing, dyeing, etc.) which interact with each other. The appearance and tactile feel of the material is similar to that of suede. It is expected that this material's application would be widened in seating as well as dash trimming due to its hard-wearing yet and luxurious-looking properties.
저 전력 블루투스 기반으로 의료데이터 전송 시 통신 거리와 연동 장치의 수가 데이터 손실률에 미치는 영향
박영상,손병진,손재범,이호열,정유수,송찬호,정의성,Park, Young-Sang,Son, ByeongJin,Son, Jaebum,Lee, Hoyul,Jeong, Yoosoo,Song, Chanho,Jung, Euisung 대한의용생체공학회 2021 의공학회지 Vol.42 No.6
Recently, the market for personal health care and medical devices based on Bluetooth Low Energy(BLE) has grown rapidly. BLE is being used in various medical data communication devices based on low power consumption and universal compatibility. However, since data errors occurring in the transmission of medical data can lead to medical accidents, it is necessary to analyze the causes of errors and study methods to reduce data error. In this paper, the minimum communication speed to be used in medical devices was set to at least 800 byte/sec based on the wireless electrocardiography regulations of the Ministry of Food and Drug Safety. And the data loss rate was tested when data was transmitted at a speed higher than 800 byte/sec. The factors that cause communication data error were classified, and the relationship between each factor and the data error rate was analyzed through experiments. When there were two or more activated peripherals connected to the central, data error occurred due to channel hopping and bottleneck, and the data error rate increased in proportion to the communication distance and the number of activated peripherals. Through this experiment, when the BLE is used in a medical device that intermittently transmits biosignal data, the risk of a medical accident is predicted to be low if the number of peripherals is 3 or less. But, it was determined that BLE would not be suitable for the development of a biosignal measuring device that must be continuously transmitted in real time, such as an electrocardiogram.