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Sürücüler, farklı koşullarda araçlarını sürmektedir. Örneğin; yüksek sıcaklık, düşük sıcaklık, gürültü, gündüz ve gece gibi. Sensörler, elektrokardiografi, deri sıcaklığı ve solunumu izler . Birçok araştırmacı, biyolojik sinyaller üzerine çalışmalar yapmaktadır. Örneğin; beyin dalgaları, nabız dalgaları ve kalp atışları uyanık ve uyku halinde farklı olmaktadır. Bu yöntemden istifade edilerek biyolojik sinyaller elektriksel sinyallere dönüştürülür. Bu sensörlerden biri de hava basınç sensörüdür. Hava basınç sensörleri (Air-pressure sensor), biyolojik sinyal toplama sensörü olarak kullanılabilir.
1. Hyun Jae Baek, Haet Bit Lee, Jung Soo Kim, Jong Min Choi, Ko Keun Kim, Kwang Suk Park; “Nonintrusive Biological Signal Monitoring in a Car to Evaluate a Driver’s Stress and Health State”, Telemedicine and e-Health, Published in Volume: 15 Issue 2: March 17, 2009.
2. Maeda Shin'ichiro, Fujita Etsunori, Ogura Yumi, Kaneko Shigehiko, “Measurement method of Biological Signal from the Hips”, Proceedings. JSAE Annual Congress, VOL.; NO.78-06; PAGE.9-12(2006)
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A physiologic monitoring system was set up in the driver’s seat of an automobile—a ubiquitous healthcare car (U-car)—using nonintrusive sensors. Sensors included electrocardiography, skin temperature, and respiration. The drivers were subjected to different conditions such as high temperatures, low temperatures, noise, and daytime/night-time driving. The system was successfully evaluated without interfering with driving and could be used as a tool for monitoring and alerting a driver of changes in physiologic conditions .
Nonintrusive monitoring of a driver’s physiological signals was introduced and evaluated in a car as a test of extending the concept of ubiquitous healthcare to vehicles. Electrocardiogram, photoplethysmogram, galvanic skin response, and respiration were measured in the ubiquitous healthcare car (U-car) using nonintrusively installed sensors on the steering wheel, driver’s seat, and seat belt. Measured signals were transmitted to the embedded computer via Bluetooth® communication and processed. We collected and analyzed physiological signals during driving in order to estimate a driver’s stress state while using this system. In order to compare the effect of stress on physical and mental conditions, two categories of stresses were defined. Experimental results show that a driver’s physiological signals were measured with acceptable quality for analysis without interrupting driving, and they were changed meaningfully due to elicited stress. This nonintrusive monitoring can be used to evaluate a driver’s state of health and stress.
Recently, a system which can monitor a car driver's biological condition and warn the driver of drowsiness is being proposed. Many researchers have presented evidence that biological signals like brain waves, pulsation waves, and cardiac beat, are different between a wakeful state and a sleep state. However, current systems to measure those signals are assumed to be used in a laboratory or with invasive monitoring. We report on an Air-pressure sensor which is a noninvasive, biological signal-gathering sensor which goes on the car seat. It can measure body signal through the buttocks using a pulse wave-measuring instrument and a strain-type respiration-measuring device .
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