• 한국항행학회논문지
• /
• 제19권5호
• /
• pp.446-451
• /
• 2015

최근 혈압, 체온 및 혈당 같은 개인 건강 정보를 알려주는 센서-기반의 유-헬스 앱에 대한 연구가 활발히 진행되고 있다. 그러나 센서들을 통해 얻어진 정보는 그 정확성에 문제가 있을 수 있으므로 가공되지 않은 상태로 사용하기 어려운 경우가 많다. 본 논문은 스마트폰과 연동하는 생체 센서들을 통해 얻어진 측정값들의 정확성을 향상시키기 위한 센서 추상화 계층을 제안한다. 이 계층은 연결된 센서의 종류를 인식하고 읽어온 센서 값들을 ISO/IEEE 11073 신체 건강 표준에 따라 변환하며, 필요한 경우 측정값들 중에서 이상치(outlier)를 제거하는 필터링(filtering) 기법과 구해진 값들을 보다 적합한 형태로 변환해주는 요약(summarization) 기법을 적용한다. 제안된 센서 추상화 계층의 평가를 위해 안드로이드 기반의 개발보드를 사용한다. 체온 센서와 심박 센서를 통해 얻어진 값들에 대해 필터링 및 요약 기법을 적용한 경우의 결과가 그렇지 않은 경우에 비해 향상된 정확성을 보인다.

• 자동차안전학회지
• /
• 제12권1호
• /
• pp.52-61
• /
• 2020

In recent years, the increasing interest in health-care requires the industrial products to be well-designed ergonomically. In the commercial vehicle industry, several researchers have demonstrated the driver's posture has great effect on the orthopedic desease such as fatigue, back pain, scoliosis, and so on. However, the existing sensor systems developed for measuring the driver posture in real time have suffered from inaccuracy and low reliability issues. Here, we suggest our smart vehicle seat system capable of real-time driver posture monitoring by using the air bag sensor package with high sensitivity and reliability. The ergonomic numerical model which can evaluate a driver's posture has been developed on the basis of the human body segmentation method followed by simulation-based validation. Our experimental analysis of obtained pressure distribution of a vehicle seat under the different driver's postures revealed our smart vehicle system successfully achieved the driver's real-time posture data in great agreement with our numerical model.

• 한국정밀공학회지
• /
• 제22권3호
• /
• pp.29-37
• /
• 2005

In this study, the control of the free surface deformation of a magnetic fluid for the change in electromagnetic force is discussed. The free surface of magnetic fluid is formed by the balance of surface force, gravity, pressure difference, magnetic normal pressure and magnetic body force. Magnetic fluid in characteristics of fluid adjusted to the opposite direction of the gravity direction. Thus, the device of a magnetic fluid proposed the complete zero-leakage sealing, oscillator for surface control, boundary layer control, MHD, flow control, flow using magnetic levitation system and surface actuator. This study show the deformation of surface rise due to the intensity of the magnetic field and possibility of two-dimensional control of magnetic fluid through the feedback data of hall sensor.

• Journal of Electrical Engineering and Technology
• /
• 제10권6호
• /
• pp.2434-2441
• /
• 2015

This paper proposes an exercise recommendation system for treating obesity that provides systematic recommendations for exercise and diet. Five body indices are considered as indicators for recommend exercise and diet. The system also informs users of prohibited foods using health data including blood pressure, blood sugar, and total cholesterol. To maximize the utility of the system, it displays recommendations for both indoor and outdoor activities. The system is equipped with multimode sensors, including a three-axis accelerometer, a laser, a pressure sensor, and a wrist-mounted sensor. To demonstrate the effectiveness of the system, field tests are carried out with three participants over 20 days, which show that the proposed system is effective in treating obesity.

• 반도체디스플레이기술학회지
• /
• 제23권2호
• /
• pp.28-32
• /
• 2024

The personal mobility Sharing service is currently active. Especially, electric scooters are widely utilized because they can move comfortably at a high speed over a short distance with a simple driving method. Its driving method is easy, but there is no protection device to protect the bare body. So, there is a greater accident than other means of transportation, and if two people are on board, there is higher accident probability. However, since there is no specific ways to prevent multi-person boarding yet, we propose a multi-person boarding detection model using tilt and pressure sensor. The proposed method measures the tilt degree and direction by using a tilt sensor installed in the center of the board plate and detects multi-people riding.

• 센서학회지
• /
• 제14권4호
• /
• pp.211-218
• /
• 2005

As the cause and the treatment about gastrointestinal disease has been issued recently, the importance of measuring the pressure in the gastrointestinal tract has been increased. However, the conventional measurement methods of the pressure in the gastrointestinal tract cause the patients' pain and inconvenience as well as an inaccurate pressure measurement. In this paper, the pressure monitoring telemetry system has been designed and implemented for an accurate pressure measurement inside the gastrointestinal tract with minimizing pain and inconvenience. The pressure monitoring telemetry system is composed of a pressure measurement capsule and an external receiver. The capsule has been miniaturized into the same size of a vitamin tablet so that the capsule can be swallowed through the oral cavity. After the capsule acquires and encodes the pressure data in the gastrointestinal tract, the encoded pressure data are modulated by frequency shift keying (FSK) and transmitted with ultrahigh frequency (UHF) band signal to the outside of a body. The performance of the telemetry capsule for monitoring pressure in the gastrointestinal tract is demonstrated by the results of animal in-vivo experiments.

• 재활복지공학회논문지
• /
• 제7권2호
• /
• pp.109-115
• /
• 2013

본 논문에서는 전동휠체어용 압력분포 측정시스템을 개발하고, 실제 휠체어 사용자들을 대상으로 동작분석과 연계한 압력분포 변화실험을 통해 유의성을 검증하고자 하였다. 측정시스템은 휠체어 이동방향에 따른 압력분포 변화 측정을 위해 64ch의 시트쿠션 FSR 센서신호 및 좌 우 각 30ch의 팔걸이 FSR 센서신호를 2ch의 좌 우 바퀴형 엔코더 신호와 동시에 12bit, 10Hz의 샘플링 속도로 획득할 수 있도록 개발하였으며, 이 신호들을 USB 인터페이스를 통해 휠체어 뒤쪽에 장착 가능한 노트북PC로 전송 후 실시간으로 화면표시, 저장, 재생을 수행할 수 있는 실시간 신호처리 소프트웨어를 개발하였다. 개발된 측정시스템을 사용한 압력분포 변화 실험은 실제 휠체어 사용자 10인을 대상으로 적외선 마커 기반의 동작분석실에서 3D 동작분석과 연계하여 실시하였다. 실험결과, 휠체어 진행 중 회전구간에서 몸이 회전의 바깥 방향으로 기울어지는 것을 확인할 수 있었으며 실험결과 및 실험 후 인터뷰를 통해 전동휠체어 설계 시 시트의 형태에 대한 개선요구사항을 획득할 수 있었다.

• 감성과학
• /
• 제22권3호
• /
• pp.55-64
• /
• 2019

Stroke is a health problem experienced by many elderly people around the world. Stroke has a devastating effect on quality of life, causing death or disability. Hemiplegia is clearly an early sign of a stroke and can be detected through patterns of body balance and gait. The goal of this study was to determine various feature vectors of foot pressure and gait parameters of patients with stroke through the use of a wearable sensor and to compare the gait parameters with those of healthy elderly people. To monitor the participants at all times, we used a simple measuring device rather than a medical device. We measured gait data of 220 healthy people older than 65 years of age and of 63 elderly patients who had experienced stroke less than 6 months earlier. The center of pressure and the acceleration during standing and gait-related tasks were recorded by a wearable insole sensor worn by the participants. Both the average acceleration and the maximum acceleration were significantly higher in the healthy participants (p < .01) than in the patients with stroke. Thus gait parameters are helpful for determining whether they are patients with stroke or normal elderly people.

• 한국산학기술학회논문지
• /
• 제10권5호
• /
• pp.992-999
• /
• 2009

심전도와 맥파를 측정함으로써 구해질 수 있는 맥파전달시간은 심혈관계의 상태를 진단하기 위한 의미 있는 지표가 된다. 그러나 맥파를 측정하는 동안 움직이거나, 측정 시에 가해지는 압력이 부정확할 경우, 잘못된 측정 결과를 얻을 수 있다. 이를 해결하기 위하여 본 논문에서는 심전도, 압력맥파 및 광전용적맥파를 동시에 측정할 수 있는 일체형 센서 시스템과 심전도를 지속적으로 측정할 수 있는 금속 전극을 개발하였으며, 실험을 통해 일체형 센서시스템 및 금속 전극의 유용성을 입증하였다.

• 한국정밀공학회지
• /
• 제23권2호
• /
• pp.146-153
• /
• 2006

Acceleration sensors have widely been used in the various fields of industry. In recent years, micromachining accelerometers have been developed and commercialized by the micromachining technique or MEMS technique. Typical structure of such sensors consist of a cantilever beam and a vibrating mass fabricated on Si wafers using etching. This study investigates the feasibility of powder blasting technique for microfabrication of sensor structures made of the pyrex glass alternating the existing Si based acceleration sensor. First, as preliminary experiment, effect of blasting pressure, mass flow rate of abrasive and no. of nozzle scanning on erosion depth of pyrex and soda lime glass is studied. Then the optimal blasting conditions are chosen for pyrex sensor. Structure dimensions of designed glass sensor are 2.9mm and 0.7mm for the cantilever beam length and width and 1.7mm for the side of square mass. Mask material is from aluminium sheet of 0.5mm in thickness. Machining results showed that tolerance errors of basic dimensions of glass sensor ranged from 3um in minimum to 20um in maximum. This results imply the powder blasting can be applied for micromachining of glass acceleration sensors alternating the exiting Si based sensors.