• International journal of advanced smart convergence
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• 제11권4호
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• pp.240-246
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• 2022

In order to measure the respiratory rate, one of the major vital signs, many devices have been developed and related studies have been conducted. In particular, as the number of wearers of respirators increases in the COVID-19 pandemic situation, studies have been conducted to measure the respiratory rate of the wearer by attaching an electronic sensor to the respirator, but most of them are cases in which an air flow sensor or a microphone sensor is used. In this study, we design and develop a system that measures the respiratory rate of the wearer using an air pressure sensor in a respirator. Air pressure sensors are inexpensive and consume less power than the other sensors. In addition, since the amount of data required for calculation is small and the algorithm is simple, it is suitable for small-scale and low-power processing devices such as Arduino. We developed an algorithm to measure the respiratory rate of a respirator wearer by analysing air pressure change patterns. In addition, variables that can affect air pressure changes were selected, and experimental scenarios were designed according to the variables. According to the designed scenario, we collected air pressure data while the respirator wearer was breathing. The performance of the developed system was evaluated using the collected data.

• International Journal of Contents
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• 제4권2호
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• pp.1-6
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• 2008

Pre schools with state of the art facilities that would provide not just academic excellence but also ensure the safety and provide efficient healthcare to their pupils relative to Atopic Dermatitis with Asthma is the main objective of this research One of the most promising applications of sensor networks is for human healthcare monitoring. Due to recent technological advances in sensor, low power microelectronics and miniaturization, and wireless networking enable the design and proliferation of this wireless sensor networks capable of autonomously monitoring and controlling environments. Thus, this research presents the utilization of such microelectronic sensor and plots the hardware and software architecture of a wireless sensor network system with real-time pupil monitoring that integrates vital sign sensors, location sensor and allergen sensor. This proposed architecture for wearable sensors can be used as active tags which can track pupil's location within the school's premises, identify possible atopic dermatitis with asthma allergens, it would monitor and generate a health status report of the pupil.

• 방송공학회논문지
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• 제26권2호
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• pp.132-142
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• 2021

본 연구는 실생활에서 가장 많이 접할 수 있는 모바일 전면 카메라를 이용하여 심장박동, 심장박동 변이율, 산소포화도, 호흡도, 스트레스수치, 혈압을 측정할 수 있는 효과적인 방법론을 제시하는 것이 목적이다. Blaze Face를 이용하여 실시간으로 얼굴인식을 진행하여 안면 이미지 데이터를 취득하고 눈, 코 입, 귀의 특징 점을 이용하여 이마를 관심영역으로 지정하며 평균값을 시간 축으로 정렬한 후 생체징후 측정에 이용하였다. 생체징후 측정 기법은 fourier transform을 기본으로 이용하였으며, 측정하고자 하는 생체징후에 맞게 노이즈 제거 및 필터 처리함으로써 측정값의 정확도를 향상 시켰다. 결과를 검증하기 위해 접촉식 센서와 비접촉식 센서 비교를 진행하였다. 분석 결과 안면 이미지를 이용하여 심장박동, 심장 박동 변이율, 산소포화도, 호흡도, 스트레스, 혈압 총 여섯 가지 생체 징후를 추출 할 수 있는 가능성을 확인하였다.

• 센서학회지
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• 제19권6호
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• pp.435-442
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• 2010

Typically, the vital signs that are representing the state of human body, are the body temperature, sphygmus, respiration and blood pressure. The body temperature is the result of metabolic regulation and human steady-state body temperature is maintained from 35.9 to $37.4^{\circ}C$ by heat regulatory center. The body temperature is indicative of infection and especially it should be monitored to requiring intensive care patients or after surgical patients. But, measuring of body temperature to a heavy workload on nursing staff has been recognized. And, the health service of nurse is limited by simple tasks such as the measurement and record of vital sign. In this paper, the body temperature monitoring telemetry system was proposed to prove the recoding and transmission of body temperature patch system according the standard(ISO TS11073-92001). We proposed the transmission protocol to suit the MFER(medical waveform format encoding rules). The telemetry patch system was implemented and it was verified by experiments.

• 한국전기전자재료학회논문지
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• 제29권5호
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• pp.284-288
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• 2016

Among the various physiological information that could be obtained from human body, heartbeat rate is a commonly used vital sign in the clinical milieu. Photoplethysography (PPG) sensor is incorporated into many wearable healthcare devices because of its advantages such as simplicity of hardware structure and low-cost. However, healthcare device employing PPG sensor has been issued in susceptibility of light and motion artifact. In this paper, to develop the real-time heart rate measurement device that is less sensitive to the external noises, we have fabricated an ultra-small wireless LC resonant pressure sensor by MEMS process. After performance evaluation in linearity and repeatability of the MEMS pressure sensor, heartbeat waveform and rate on radial artery were obtained by using resonant frequency-pressure conversion method. The measured data using the proposed heartbeat rate measurement system was validated by comparing it with the data of an commercialized heart rate measurement device. Result of the proposed device was agreed well to that of the commercialized device. The obtained real time heartbeat wave and rate were displayed on personal mobile system by bluetooth communication.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.1185-1188
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• 2005

Recently, ubiquitous computing and sensor networks are making a rapid development. These technology can enable a new way of biomedical signal processing and healthcare. that is, they can improve care giving by a more flexible acquisition of relevant vital sign data, and by providing more convenience for patients. In this paper, we realize the biomedical sensor networks by applying IEEE 802.15.4/Zigbee networks to some various biomedical sensing unit. For address this, we developed minimized zigbee module and set-up procedure using PDA. The main advantages that we achieve are interference-free operation of different body sensor networks in the vicinity, as well as intuitive usage by the nontechnical personnel.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권5호
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• pp.1014-1035
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• 2013

With recent advances in wireless communication and low-power miniaturized biomedical sensor and semiconductor technologies, wireless body area networks (WBAN) has become an integral part of the disaster aid system. Wearable vital sign sensors can track patients' status and location, thus enhancing disaster rescue efficiency. In the past few years, most of the literatures in the area of disaster aid system based on WBAN have focused on issues concerning wireless sensor design, sensor miniaturization, energy efficiency and communication protocols. In this paper, we will give an overview of disaster aid, discuss about the types of network communication as well as outline related issues. We will emphasize on analyzing six key issues in employing the disaster aid system. Finally, we will also highlight some of the challenges that still need to be addressed in the future in order to help the disaster aid system be truly and widely accepted by the public.

• 센서학회지
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• 제31권6호
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• pp.433-440
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• 2022

Recently, owing to global warming, average summer temperatures are increasing and the number of hot days is increasing is increasing, which leads to an increase in heat stroke. In particular, outdoor workers directly exposed to the heat are at higher risk of heat stroke; therefore, preventing heat-related illnesses and managing safety have become important. Although various wearable devices have been developed to prevent heat stroke for outdoor workers, applying various sensors to the safety helmets that workers must wear is an excellent alternative. In this study, we developed a smart helmet that measures various vital signs of the wearer such as body temperature, heart rate, and sweat rate; external environmental signals such as temperature and humidity; and movement signals of the wearer such as roll and pitch angles. The smart helmet can acquire the various data by connecting with a smartphone application. Environmental data can check the status of heat wave advisory, and the individual vital signs can monitor the health of workers. In addition, we developed an algorithm that classifies the risk of heat-related illness as normal and abnormal by inputting a set of vital signs of the wearer using a support vector machine technique, which is a machine learning technique that allows for rapid binary classification with high reliability. Furthermore, the classified results suggest that the safety manager can supervise the prevention of heat stroke by receiving feedback from the control system.

• 감성과학
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• 제15권4호
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• pp.415-424
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• 2012

1990년대 이후 웰빙 라이프스타일의 도입 및 인구 고령화 사회의 진입으로 인해 언제 어디서나 지속적으로 측정가능한 생체 신호 센싱 모니터링 시스템에 대한 관심이 높아지고 있다. 이에 따라, 최근 지속적으로 호흡 측정이 가능한 시스템에 대한 연구 및 개발이 활발히 이루어지고 있으나 소비자 수요에 기반한 스마트 의류적용을 위한 호흡 측정 시스템의 연구는 미비하다. 따라서, 본 연구에서는 압전의 원리를 이용하여 호흡시 인체의 체표면이 변화하면서 센서에 가해지는 압력을 전기적 신호로 바꾸어 호흡을 측정하는, 전도성 섬유기반의 전기용량성 섬유 압력 센서(Textile Capacitive Pressure Sensor, TCPS)를 개발하였으며, 이를 실증적 연구를 통해 센서의 유용성을 입증하고자 하였다. 그 결과, Nasal로부터 측정된 호흡율과 TCPS를 통해 측정된 호흡율간의 상관계수는 r＝0.9553 (p< 0.0001)로 TCPS의 신호 측정 정확성을 확인할 수 있었으며, 또한, 사용성 및 착용성 평가의 결과 인지적 변화, 착용성, 운동성, 관리의 용이성 및 유용성에서 모두 만족한다 정도의 평가 결과를 가져와 본 연구에서 개발된 TCPS의 착용성 및 의류 적합성을 입증하였다. 마지막으로 TCPS의 의류 적합 위치 평가 결과는 복부 부위에서 신호의 안정감을 갖으며, 착용감도 높은 것으로 나타났다. 최종적으로, 위의 결과들을 종합하여 호흡 측정 기능의 스마트 의류 개발을 위한 기초 디자인을 제시하였다.

• 감성과학
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• 제16권3호
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• pp.397-408
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• 2013

최근 건강에 대한 관심의 증가와 고령화 사회의 진입으로 인해 센서 기반 스마트 의류는 다양한 어플리케이션과 타입으로 개발되고 있다. 센서기반 스마트 의류는 인체로부터 생체 신호를 측정, 모니터링을 주 목적으로하는 기능성 의류의 한 분야로 신호의 정확성, 기기의 착용성, 센서의 인체 적합성 등의 인체-기기-의류간의 상호작용을 고려하여 디자인되어야 한다는 점에서 기존의 스마트 의류와 다른 특성을 지닌다. 센서기반 스마트 의류의 이러한 특성은 의복의 제작 단계에 있어 요구공학의 단계를 기반으로 개발 목적에 대한 요구의 명확한 문서화 뿐 아니라, 각 단계 진행을 위해 기기분야와 의류분야간의 상호운용성 평가가 이루어져야 하는 필요성을 갖을 것으로 예상된다. 따라서, 본 연구에서는 요구공학이 적용된 센서 기반 스마트 의류 프로세스의 효용성 평가를 위해 실증적 수행 분석을 통해 스마트 의류의 기본 프로세스를 도출하고, 요구공학 분석기법의 단계를 도입하여 두가지 스마트 의류 프로세스를 도출하였다. 제시된 두 프로세스의 실증적 단계별 진행을 통해 프로세스의 효율성 및 디자인의 질적 평가를 수행하였으며, 요구공학이 적용된 센서 기반 스마트 의류의 프로세스의 효용성을 제시하였다.