• 전기학회논문지
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• 제56권7호
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• pp.1339-1342
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• 2007

In this study, we determined the optimum electrode pair for measuring the abdominal pressure using bio-impedance method and compared with conventional methods. Because impedance changes differ from a weight, a height, contractile force, volume of muscle and blood other or whatever of individuals, it was quantified using values of impedance change, correlation coefficient and SNR. Our results showed the optimum electrode pair (1, 9) which could detect impedance changes due to an increase of the intensity of the abdominal pressure. The correlation coefficient and quadratic function between the RMS values of EMG and the impedance changes were 0.87 and $y=0.0014x^2+0.0620x+0.6958$, respectively. It demonstrated that the abdominal pressure could be measured noninvasively and simply using bio-impedance method. We propose that this optimum electrode configuration would be useful for future studies involving the convenient measurement of abdominal pressure by ambulatory urodynamics monitoring study.

• 한국콘텐츠학회논문지
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• 제10권4호
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• pp.98-105
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• 2010

사람들의 건강에 관련된 혈당, 혈압, 활동량 등을 생체 센서를 이용하여서 생체 정보를 획득하고, 건강상태를 모니터링하기 위한 시스템을 개발하기 위한 연구가 많이 되고 있다. 본 논문에서 생체 정보를 모니터링하여 분석하는 u-헬스 케어 에이전트 시스템을 개발하였다. 활동량 측정은 3축 가속도계 센서 기술을 이용한다. 3축 가속도 센서에서 획득되는 정보를 이용하여 활동량을 분석하여 정확한 활동량을 계산하는 알고리즘을 개발하였다. 기존 시스템들 보다 더 정확한 소모 칼로리를 계산하고, 이를 데이터베이스에 저장 관리한다. 또한 활동량과 생체 정보를 활용하여 건강 상태를 점검할 수 있다.

• 한국의류학회지
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• 제39권3호
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• pp.369-378
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• 2015

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.

• Journal of the Optical Society of Korea
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• 제17권1호
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• pp.91-96
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• 2013

We report a method for optical monitoring of tumors in an animal model using optical coherence tomography (OCT). In a spectral domain OCT system, a superluminescent diode light source with a full width of 66 nm at half maximum and peak wavelength of 950 nm was used to take images having an axial resolution of 6.8 ${\mu}m$. Cancer cells of PC-3 were cultured and inoculated into the hypodermis of auricle tissues in BALB/c nude mice. We observed tumor formation and growth at the injection region of cancer cells in vivo and obtained the images of tumor mass center and sparse circumferences. On the $5^{th}$ day from an inoculation of cancer cells, histological images of the tumor region using cross-sectional slicing and dye staining of specimens were taken in order to confirm the correlation with the high resolution OCT images. The OCT image of tumor mass compared with normal tissues was analyzed using its A-scan data so as to obtain a tissue attenuation rate which increases according to tumor growth.

• 전자공학회논문지SC
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• 제45권4호
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• pp.42-50
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• 2008

본 논문에서는 원격 의료 서비스를 위한 생체 신호 취득 및 전송 시스템의 실시간 신뢰성을 보장하기 위하여 ZigBee와 SIP/RTP를 기반으로 하는 실시간 생체 신호 전송 시스템의 성능 개선 방법을 제안하고 구현하였다. 기존의 시스템은 ZigBee기반의 유비쿼터스 센서 네트워크를 기반으로 사용자의 ECG 및 기타 생체 신호를 수집한다. 이 때 연속된 ECG 전송에 의하여 채널이 과다하게 점유되어 ECG 이외의 생체 신호를 전송할 때 패킷의 손실이 발생한다. 또한 하나의 RTP 세션을 통해 사용자의 음성과 ECG 및 기타 생체 신호를 순차적으로 전송하기 때문에 과중한 전송 스레드 부하와 지연이 발생한다. 따라서 본 논문에서는 ECG 전송 모듈의 채널 점유 문제를 해결하기 위해 Bluetooth를 보조 전송 수단으로 사용하고 복수의 RTP 세션과 전송 스레드를 사용하여 전송지연을 감소시키는 방법을 사용하였다. 또한 이산 웨이블릿 리프팅과 다단계 벡터 양자화 기반의 압축 방법을 적용하여 전송 및 저장되는 ECG를 압축하여 관리하는 구조를 제안하고 구현하였다. ECG의 압축은 데이터의 전송량을 감소시켜 시스템의 실시간 신뢰성을 향상시키며 데이터베이스의 저장 공간을 효율적으로 사용할 수 있도록 한다. 결과적으로 기존의 시스템에 대하여 유비쿼터스 센서 네트워크의 안정성을 확보할 수 있었고 실시간 전송 모듈의 프로세스 점유율을 약 20% 감소시킬 수 있었으며 실제 측정한 ECG를 압축한 결과 25.6:1의 압축률에서 약 3.25%의 PRD를 가지는 효율적인 ECG 관리가 이루어질 수 있었다.

• Journal of Information Processing Systems
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• 제5권2호
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• pp.77-86
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• 2009

In this paper, we propose a framework for the real-time monitoring of wireless biosensors. This is a scalable platform that requires minimum human interaction during set-up and monitoring. Its main components include a biosensor, a smart gateway to automatically set up the body area network, a mechanism for delivering data to an Internet monitoring server, and automatic data collection, profiling and feature extraction from bio-potentials. Such a system could increase the quality of life and significantly lower healthcare costs for everyone in general, and for the elderly and those with disabilities in particular.

• 한국의류학회지
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• 제48권1호
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• pp.94-107
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• 2024

This study developed compression pants with excellent wearability and signal quality by approaching the design of wireless sEMG monitoring pants from the perspective of technical design, including the evaluation of wearability and the stable wireless transmission of signals through electrode and circuit design, and using e-textiles. An electrode, sewn with silver thread and a circuit stitched in a zigzag pattern using stainless steel wire, were applied. Additionally, polyurethane sealing tape was used to enhance adherence to the skin and reduce electrical resistance. Conductive snaps completed the design, allowing attachment and detachment to the bio-signal acquisition mainboard. Through the subjects' evaluation, it was determined that the final pants were applied with a pattern reduction rate of 25% to provide superior comfort according to different body parts while also minimizing skin irritation around the thigh circuit. The final pants for wireless sEMG monitoring, which demonstrated stable transmission of wireless measurements, was positively evaluated in terms of cognitive acceptability. This study is significant in that it achieved an optimal design by considering both technical aspects and the electrical characteristics of bio-signal monitoring garments, as well as the wearer's perception when designing smart wear.

• 한국농공학회논문집
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• 제60권3호
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• pp.113-121
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• 2018

The objectives of the research were 1) to develop the low-cost and high efficient desalination system to treat brackish water having high salt contents for irrigation at greenhouses near coast, and 2) to monitor and assess the effects of the brackish water desalination system on soil environment and growth in squash greenhouse cultivation area. The monitoring site was one of the squash greenhouse cultivation farm at Choengam-ri, Jinsang-myun, Gwangyang-si, Jeonnam-Do Monitoring results for groundwater irrigation water quality, and salinity showed a remarkable difference between control and treatment group. The salinity of soil at treatment group was less than at control group. While, the system made possible to increase the squash quantity from 4.7 ea to 6.3 ea at each and the average weight of the harvested squash was increased from 277.2 g to 295.1 g. The applied brackish water desalination system may be appled to reclaim sea or brackish irrigated area as alternative water resources, although long-term monitoring is needed to get more representative results at different level of salinity.

• 한국정보통신학회논문지
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• 제12권11호
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• pp.2097-2104
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• 2008

오늘날 가정은 더 이상 의식주를 해결하는 곳이 아니다. 이제 홈 네트워크는 예전 말이 되었고 가정 내 디지털 가전기기들은 OSGi나 UPnP 등이 확장되어 언제 어디서나 인터넷을 통해 자동 제어되고 있다. 본 연구는 OSGi나 UPnP 확장을 통해 디지털 홈 네트워크 미들웨어를 기본 제공하고 JESS 추론 엔진을 통해 스마트 홈 네트워크를 구성한다. 그리고 휴대용 심전도, 혈압, 맥박, 체온 등의 생체 신호 측정 센서를 통하여 생체 인식 기반스마트 홈 미들웨어를 제공하여, 사용자가 집에서 머무르는 동안 사용자와 근접하여 사용자가 요구하는 홈서비스를 예측하여 자동으로 제공해 주며, 제공된 홈서비스가 사용자에게 미치는 스트레스를 분석하여 사용자가 가장 편안하게 느끼는 홈서비스를 추천하고 사용자의 건강 상태를 실시간으로 모니터링 하여 사용자의 건강 상태가 나빠지면 자동으로 사용자, 가족 그리 고 의사에게 자동으로 알려 주는 시스템을 구축한다.

• Journal of Biosystems Engineering
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• 제40권4호
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• pp.368-372
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• 2015

Purpose: The purpose of this study is to verify the feasibility of using an infrared sensor to measure the body temperature of a sow. We first conducted experiments on three pigs by using three infrared sensors and one indoor temperature sensor. Methods: The three infrared sensors were installed inside our model house and were used to take temperature measurements per second of the backs of the pigs. While feeding, the temperatures of the backs of the pigs were measured at distances of 10 cm, 20 cm, and 30 cm from the infrared sensors. Results: We concluded that the relation between the temperature of the pigs' backs and the indoor temperature was y =0.549x + 18.459 at a measuring distance of 30 cm. The relation was y = 0.645x + 15.461 for a distance of 20 cm and y = 0.760x + 11.913 for a distance of 10 cm. We found high correlation between the indoor temperature and the temperature of the pigs' backs. Conclusions: It is possible to use an infrared thermometer to monitor the temperature of pigs' backs. This system seems to be feasible and effective in monitoring pig temperature. The use of an infrared thermometer will also make daily monitoring easy. In later experiments, the possibility of developing a system that can determine if an error can be corrected by using infrared sensor is explored by considering humidity variables.