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연구논문 : 비접촉식 심장활동 모니터링 기능 의복형 웨어러블 시스템의 모듈 효과 탐색
구혜란 ( Hye Ran Koo ),이영재 ( Young Jae Lee ),지선옥 ( Sunok Gi ),이승표 ( Seung Pyo Lee ),김경남 ( Kyeng Nam Kim ),강승진 ( Seung Jin Kang ),이정환 ( Jeong Whan Lee ),이주현 ( Joo Hyeon Lee ) 한국의류학회 2015 한국의류학회지 Vol.39 No.3
Various forms of wearable bio-signal monitoring systems have been developed recently. Acquisition of stable bio-signal data for health care purposes needs to be unconscious and continuous without hindrance to the users`` daily activities. The garment type is a suitable form of a wearable bio-signal monitoring system; however, motion artifacts caused by body movement degrade the signal quality during the measurement of bio-signals. It is crucial to stabilize the electrode position to reduce motion artifacts generated when in motion. The problems with motion artifacts remain unresolved despite their significant effect on bio-signal monitoring. This research creates a foundation for the design of garment-type wearable systems for everyday use by finding a method to reduce motion artifacts through modular design. Two distinct garment-type wearable systems (tee-shirt with a motion artifact-reducing module (MARM) and tee-shirt without a MARM) were designed to compare the effects of modular design on the measurement of heart activity in terms of electrode position displacement, signal quality index value, and morphological quality. The tee-shirt with MARM showed superior properties and yielded higher quality signals than the tee-shirt without MARM. In addition, the tee-shirt with MARM showed a better repeatability of the heart activity signals. Therefore, a garment design with MARM is an efficient way to acquire stable bio-signals while in motion.
소규모 농산물 가공사업장 작업자의 직무스트레스 평가 및 근골격계부담작업 유해요인 조사
구혜란 ( Hye Ran Koo ),신용석 ( Yong Seok Shin ),채혜선 ( Hye Seon Chae ),이경숙 ( Kyung Suk Lee ) 한국농촌지도학회 2011 농촌지도와 개발 Vol.18 No.4
The purpose of this study is to survey job stress and Musculoskeletal Disorder(MSDs) of workers in small plants with agricultural products. The subjects were comprised of 69 workers participated in Helping the rural women to get the small businesses project. The questionnaire surveys were Korean Occupational Stress Scale(KOSS), and Legal Risk Assessment of Musculoskeletal Disorders(KOSHA CODE H-30-2003). As a result of the survey, scores of KOSS 8 sub-items except for job demand were similar to that of Korea workers. Prevalence of MSDs symptoms of small plants workers was high percent (44.9%). And the rate according to kinds of product was significant difference at neck (p<0.01), lumbar (p<0.01), and leg p<0.01). There was no significant difference between view person sign of MSDs and non MSDs according to sex, year, the number of workers, working years, working time per one day, rest time per one day, and subjective working intensity, but there were significant difference between high stress group and low stress group about MSDs at interpersonal conflict(p<0.05). Job stress and MSDs were important factor to workers of small plants producted agricultural products. Therefore, starting a business with small plats, workers consider interpersonal conflict and body part showing MSDs
소규모 작업장 작업자들의 인간공학적 평가 및 정량적 부하 평가 -한과작업장을 중심으로-
구혜란 ( Hye Ran Koo ),김효철 ( Hyo Cher Kim ),신용석 ( Yong Seok Shin ),이경숙 ( Kyung Suk Lee ) 한국농촌지도학회 2012 농촌지도와 개발 Vol.19 No.4
본 연구의 목적은 소규모 농산물 가공공장 중 하나인 한과작업장의 작업자들을 대상으로 인간공학적 평가를 실시하고, 이를 바탕으로 정량적 평가를 위해 실내 근전도 실험을 하여 어떤 작업에서 어떤 근육에 근골격계질환 가능성이 있는지 평가하는데 있다. 연구방법은 인간공학적 평가도구인 RULA 및 REBA를 이용하여 근골격계질환 위험 작업을 추출하고, 신체건강한 성인 남성 6명을 대상으로 근전도 실험을 하였다. 인간공학적 평가 결과 건조작업이 근골격계질환 위험도가 가장 높았으며, 건조 작업자세, 수세 작업자세, 고물 묻히는 작업자세 중 수세 작업자세가 근활성도가 가장 높았다. 특히, 건조작업에서 하지근육인 대퇴이두근과 비복근이 다른 근육들에 비해 상대적으로 근활성도가 높았다. 따라서 추후에 한과작업장 설계시 허리를 깊게 숙인 채 장시간 작업하는 자세가 없도록 해야 한다. Based on the ergonomic evaluation of workers in the domestic traditional Korean sweet manufacturer, one of the small scale agricultural product manufacturers, the purpose of this study is on estimating the specific works and muscles that have possibility of musculoskeletal disorder through an EMG experiment for quantitative evaluation. The method followed in an order: works that have musculoskeletal disorder risk were extracted through ergonomic assessment tools, RULA and REBA, and then EMG experiment on the postures was carried out with six healthy adult male patients. As an ergonomic evaluation result, work posture during the drying process had the greatest musculoskeletal disorder risk, and EMG activity in the cleansing work posture scored the highest among the drying, cleansing, and coating work postures.In particular in the drying work, relatively high EMG activities were shown in the two muscles in the lower body: biceps femoris muscle, and gastrocnemius, than any other muscles. Therefore, during the traditional Korean sweet workplace design in future, the workplace requires a posture that deeply bow wrist for a long time should be avoided.
직물 전극의 형상 특성이 자계 유도성 전도율 기반의 비접촉식 심장활동 센싱에 미치는 효과의 분석
지선옥(Sun Ok Gi),이영재(Young Jae Lee),구혜란(Hye Ran Koo),강선아(Seon Ah Khang),박희정(Hee Jung Park),김경섭(Kyeong Seop Kim),이주현(Joo Hyeon Lee),이정환(Jeong Whan Lee) 대한전기학회 2013 전기학회논문지 Vol.62 No.6
The purpose of this research is to analyze the effect of shape of the inductive textile electrode on the non-contact heart activity sensing, based on the magnetic-induced conductivity principle. Four types of the inductive textile electrodes were determined according to the combinations of the two shape features. A fiber-metal hybrid-typed conductive thread was developed and applied to materialization of the textile electrodes by embroidery method. The heart activity was extracted through the textile electrode sewn on a T-shirt. The experiments were implemented to constantly measure the heart activity for 20 seconds, in each case of 5 healthy male subjects. The heart activity signals acquired in each type of the inductive textile electrode were analyzed, 1)by drawing a comparison of morphology with those of ECG signal (LeadⅡ), and 2)by calculation of the normalized mean and standard deviation of magnitude of the heart activity signals. The analysis resulted that the relatively better quality of signals were acquired in the ‘square’ types in the matter of whole shape, while the better results were obtained in ‘donut’ types in the matter of center hole. Accordingly, the relatively best quality of signals was obtained in the case of ‘Square-Donut’ type of the inductive textile electrode.
조현승 ( Hyun Seung Cho ),김정호 ( Jung Ho Kim ),구혜란 ( Hye Ran Koo ) 한국감성과학회 2014 감성과학 Vol.17 No.3
This study aims at providing basic data for product planning to design smart clothing and to develop applications, focusing on consumers by satisfying their emotions through analyzing emotional factors on smart clothing, comparing emotional differences between conventional clothing and it, reviewing changes of consumers` emotion by integrating the product and clothing and researching differences of preference and purchase intention between smart clothing and traditional one. As the results of the study, emotional factors for smart clothing were analyzed with total 6 including ‘technical’, ‘comfort’, ‘aesthetic’, ‘modern’, ‘fun’ and ‘multiple’ factors. Among them, except for ‘comport’, five emotional factors showed emotional factors between conventional sport-casual clothing and smart clothing. That is, emotional factors of ‘technical’, ‘aesthetic’, ‘modern’, ‘fun’ and ‘multiple’ were emphasized more in smart clothing than conventional ones, indicating that they should be considered in planning products of smart clothing. Though there was no significant difference of preference between smart clothing and conventional clothing, in case of comparison of averages, that of smart clothing was a little higher. For purchase intention, smart clothing was lower than the conventional clothing. So preference seems to be not directly related to consumers` immediate purchase. To make consumers` interests and preference to result in purchase, it is necessary to develop smart clothing with more various applications and to prepare commercializing strategies. As the results of the analysis on free-descriptive questionnaire survey, consumers were interested in development of smart clothing to help diet with functions including energy harvesting from body motion, calorification and perspiration, measurement of motion and calory consumption as well as health-care type smart clothing to measure heartbeat and ECG. Reflecting these requirements from the consumers, they should be utilized as guidance to develop smart clothing in the future.