• Journal of Biomedical Engineering Research
• /
• v.28 no.3
• /
• pp.325-331
• /
• 2007

Personal identification is essential for the automatic measurement of biosignal information in home healthcare systems. Personal identification is usually achieved with passive radio frequency identification (RFID), which does little more than store a unique identification number. However, passive RFID is not ideal for automatic identification. We present a user identification system based on radio signal strength indication (RSSI) using ZigBee for active RFID tags. Personal identification is achieved by finding the largest RSSI value from aggregated beacon messages that are periodically transmitted by active RFID tags carried by users. Obtaining reliable person!'.! identification without restricting the orientation requires a certain distance between the closest active RFID tag from the ZED and the second closest tag. The results show that the closest active RFID tag from the ZED and the second closest tag must be at least 70 cm apart to achieve reliable personal identification.

• Journal of Microbiology and Biotechnology
• /
• v.10 no.2
• /
• pp.201-207
• /
• 2000

The freshwater green alga Chlorococcum sp. grew on NH_4^{+},{\;}NO_3^{-}$, urea, yeast extract, and peptone as the nitrogen source showing similar pattens of growth and secondary carotenoid (SC) production. However, the most suitable nitrogen source for the induction fo SC was urea. The dffects of nutrient levels (urea, phosphate, sulfate, ferrous iron, and salt) on growth and SC production were stydied by varying the concentration of each nutrient in batch cultures. High biomass production was achieved in cultures containing 20-28 mM urea, 4.8-10 mM phosphate, 1.6 mM sulfate, 70 mM phosphate, 1.6 mM sulfate, 170 mM NACl, and $50{\;}\mu\textrm{M}$ iron. The optimum concentrations of nutrients for biomass and for the SC accumulation in biomass were evaluated and the two media for achieving high biomass production and SC production were thus developed. The extent to which each parameter to stimulate the formation of SC in the alga were varied and the potentially improned SC prodution by manipulating the nutrient levels in the modified media were descussed.

• 전자공학회논문지 IE
• /
• v.49 no.2
• /
• pp.82-88
• /
• 2012

In this paper, using the Android-based mobile platform designed and integrated U-healthcare systems for personal health care system is proposed. Integrated Biometric systems, electrocardiogram (ECG), oxygen saturation, blood pressure, respiration, body temperature, such as measuring vital signs throughout the module and signal processing biometric information through wireless communication module based on the Android mobile platform is transmitted to the gateway. Biometric data transmitted from a mobile health monitoring system, or transmitted to the server of U-healthcare was designed. By implementing vital signs monitoring system has been measured in vivo by monitoring data to determine current health status of caregivers had the advantage of being able to guarantee mobility respectively. This system is designed as personal health management and monitoring system for emergency patients will be helpful in the development looks U-healthcare system.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.11 no.12
• /
• pp.5878-5904
• /
• 2017

This paper proposes a novel intelligent wheelchair vehicle system that enables upper limb exercises, lower limb standing exercises and rehabilitation training in a daily life. The proposed system, which can be used to prevent at least the degeneration of body movements and further atrophy of musculoskeletal system functions, considers the characteristics and mobility of the old and the disabled. Its main purpose is to help the old and the disabled perform their daily activities as much as they can, minimizing the extent of secondary disabilities. In other words, the system will provide the old and the disabled with regular and quantitative rehabilitation exercises and diagnosis using the wheelchair-based upper/lower limb rehabilitation vehicle system and then verify their effectiveness. The system comprises an electric wheelchair, a biometric module to identify individual characteristics, and an upper/lower limb rehabilitation vehicle. In this paper the design and configuration of the developed vehicle is described, and its operation method is presented. Moreover, to verify the tracking performance of the proposed system, dangerous situations according to biosignal changes occurring during the rehabilitation exercise of a non-disabled examinee are analyzed and the performance of the upper/lower limb rehabilitation exercise function depending on muscle strength is evaluated through a neural network algorithm.

• Transactions on Electrical and Electronic Materials
• /
• v.16 no.1
• /
• pp.16-19
• /
• 2015

A wearable sensing ECG T-shirt for ubiquitous vital signs sensing is proposed. The sensor system consists of a signal processing board and capacitive sensing electrodes which together enable measurement of an electrocardiogram (ECG) on the human chest with minimal discomfort. The capacitive sensing method was employed to prevent direct ECG measurement on the skin and also to provide maximum convenience to the user. Also, low power integrated circuits (ICs) and passive electrodes were employed in this research to reduce the power consumption of the entire system. Small flexible electrodes were placed into cotton pockets and affixed to the interior of a worn tight NIKE Pro combat T-shirt. Appropriate signal conditioning and processing were implemented to remove motion artifacts. The entire system was portable and consumed low power compared to conventional ECG devices. The ECG signal obtained from a 24 yr. old male was comparable to that of an ECG simulator.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2005.11a
• /
• pp.71-74
• /
• 2005

유비쿼터스 헬스케어는 생체신호 측정기술과 생체신호 측정기의 소형화 경량화로 인해 의료분야의 획기적인 변화를 가져올 것으로 기대된다. 그러나 생체신호 측정 기술의 발전에 비해서 대부분의 생체신호 데이터는 각 시스템 고유의 데이터 포맷을 사용하기 때문에 사용범위가 제한되고 데이터 공유 및 호환에 어려움이 있어 구조적이며 시스템 독립적인 XML을 사용하여 생체신호 데이터를 표현하는 방법이 필요하다. 본 논문에서는 XML 기반의 HL7 Annotated ECG(HL7 aECG) 표준을 이용해서 생체신호 데이터를 표현하고 저장하는 방법을 제시한다. 제시된 방법은 ECG, 심음의 두채널 파형 정보를 포함한 바이너리 포맷을 HL7 aECG 문서로 표현하며, HL7 aECG 문서의 특성을 고려하여 비분할 저장 방식을 사용하고 효율적인 검색을 위해 메타데이터를 추출하여 관계형 테이블에 저장하는 분할 저장 방식을 병행하여 사용한다. 또한 저장된 메타데이터를 효율적으로 검색 및 관리하는 메타데이터 시스템을 설계하며 설계된 구조는 향후 다른 시스템과 연계의 가능성을 제공한다.

• Journal of Sensor Science and Technology
• /
• v.7 no.3
• /
• pp.197-202
• /
• 1998

The human pulse wave is a vital biosignal that includes the diagnostic data related with the heart and the cardiovascular system of human body. Based on the mechanical transducing method, a pulse detection transducer using optical fiber was developed to acquire the pulses non-invasively. To improve the detection efficiency, we proposed a new design that consists of two combinational parts; detecting part, which is in contact with the pulsating skin and transmits the displacement motion of the pulsating skin to the sensing part, and sensing part, which converts the physical quantity transmitted from the detecting part to electronic signal. By using the new method, we confirmed that the proposed transducer can detect the C point(incisura) and the T wave(tidal wave) which is not easily detected by existing transducers.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
• /
• 2009.05a
• /
• pp.153-156
• /
• 2009

본 연구는 3 단계 각성 모드에 따른 자율신경계 반응 모델 구현에 대한 연구이다. 정신생리학(Psycho-Physiology)에서의 각성 시스템 모델은 Boucein(1992, 2006)에 의해 제안되었다. 각성 시스템 1 은 편도체(amygdala)활동과 관계한, 무의식수준에서 주의를 집중시키는 역할을 한다. 각성 시스템 2 는 해마(hippocampus)활동과 관계한, 인지적 각성 단계로서 상황-반응(situation-reaction) 대한 연결을 담당하는 역할을 한다. 각성 시스템 3 은 기저핵(basal ganglia)활동과 관계한, 몸운동(somatomotor)활동과 관계된 뇌 영역의 준비를 활성화시킨다. 각성 시스템은 상황의 변화나 특정 자극이 일어나면, 그에 해당하는 각성 모드에 의해 자율신경계(automatic nervous system)반응이 발생한다. 따라서, 자율신경계반응의 분석을 통하여 각성 시스템의 단계를 평가할 수 있다. 본 연구는 자율신경계반응 중 GSR(galvanic skin Response)과 SKT(skin temperature)분석을 통하여 3단계 각성 모드인 직관적, 인지적, 행동적 모드를 평가하는 연구이다.

• Journal of the Institute of Electronics Engineers of Korea SC
• /
• v.47 no.4
• /
• pp.21-29
• /
• 2010

In this study, we aimed to develope the physio-module for echocardiography. This physio-module includes multi-functions such as ECG, respiration, PCG, heart sound, and this is used to diagnose a cardiac disease in using ultrasound images synchronized with biosignals of physio-module. In this paper, the developed physio-module was verified by applying various test patterns considering each biosignal's characteristics and we could get the performance of QRS trigger delay time within international standard, EC-13 criteria. And ECG's change in physio-module and blood flow in M-mode was synchronized.

• The Research Journal of the Costume Culture
• /
• v.27 no.6
• /
• pp.615-631
• /
• 2019

Smart healthcare clothing combines IoT, new technology, and clothing construction to perform specific care functions, and its utility has been expanding rapidly within aging and diversified societies. However, the related market remains at an early stage of development due to limited regulation, lack of consumer awareness, and the need for not only technical development but promotion plans for potential users. This paper aims to analyze factors influencing purchase intention for smart healthcare clothing with biosignal monitoring, including variables in the Technology Acceptance Model (TAM), clothing attributes, health-related lifestyle factors, and fashion innovativeness. A survey was conducted on a sample of 300 males and 300 females ranging in age from 20 to 50 years, and data were analyzed using SPSS 21.0. The results show that perceived usefulness, perceived aesthetic attributes, health responsibility, and fashion innovativeness were overall significant predictors of using smart healthcare clothing. Additionally, perceived ease of use and physical activity in the male subsample, and perceived compatibility within the female group, also had significant effects. Furthermore, age was a determining factor; for subjects in the 30s age group, perceived usefulness, compatibility, and health responsibility had significant positive associations. The results of this study can provide basic guidelines for designing merchandising plans to expand user acceptance of smart healthcare clothing.