• Korean Journal of Cognitive Science
• /
• v.16 no.3
• /
• pp.189-197
• /
• 2005

In this study, changes in performance of 2-back task, blood oxygen saturation and heart rate due to $40\%$ concentration oxygen supply were observed. Five male $(25.8\pm1.3)$ and five female $(23.0\pm1.0)$ college students were nked to perform 2-bark task during two types of oxygen (concentration $21\%,\;40\%$) administration. The experimental sequence consisted of Rest1(1 min.), 0-back Task (1 min.), 2-bark Task (2 min.), and Rest2 (4 min.) and the physiological signals such as blood oxygen saturation and heart rate were measured throughout the stages. The experimental result showed that the performance increased significantly at $40\%'s$ concentration of oxygen rather than $21\%'s$, which shows oxygen supply has positive influence on cognitive performance. When $40\%$ concentration oxygen is supplied, the oxygen saturation in the blood increased and heart rate was decreased significantly comparing to $21\%$. It is Suggested that $40\%$ oxygen can stimulate brain activation bY increasing actual blood oxygen concentration in the process of cognitive performance, and hyperoxia makes heart rate decrease.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2004.05a
• /
• pp.300-300
• /
• 2004

본 연구에서는 언어과제 수행 시 일반 공기 중의 산소 농도 (21%) 환경에 비해 외부에서 고 농도 (30%)의 산소 공급이 혈중 산소 포화도(SPO$_2$), 심박동율(Heart Rate), 정답률(Accuracy), 반응속도(Reaction Time)에 어떠한 영향을 미치는지를 검증하고자 한다. 30%와 21%의 산소를 8L/min의 양으로 일정하게 공급할 수 있는 산소 공급 장치를 이용하였고, 10명의 대학생(오른손잡이, 평균나이 23.4세)을 대상으로 실험을 수행하였다. 난이도가 비슷한 두 가지 언어과제를 28문제씩 피험자에게 풀게하여 정답률과 반응속도를 계산하였다.(중략)

• Journal of Digital Contents Society
• /
• v.11 no.2
• /
• pp.277-282
• /
• 2010

In this paper, the wireless transmission module is developed to transmit oxygen saturation(SpO2) signal, acquired from bio-signal measuring module, to PC. This wireless transmission module is designed with closed type protocol instead of open type protocol such as a zigbee or a bluetooth, considering of the security of personal medical informations. The display software is also developed to display transmitted SpO2 signals by various type data and graph without information loss for a emergency transfer.

• Proceedings of the KOSOMBE Conference
• /
• v.1991 no.11
• /
• pp.133-141
• /
• 1991

혈중 산소 포화도는 생체의 중요한 정보로써 많은 학자들이 산소 포화도를 비추출방법으로 측정하기 위한 이론과 센서의 제작에 관해서 연구를 하고 있다. 혈액에서의 빗의 흡수(Absorption)와 산란(Scattering)에 관한 이론 연구가 Ishimaru, Takatani. Johnson 등의 학자들에 의해 진행되었고, Polanyi, Hehir, Johnson, Schmitt등에 의해서 센서 구조와 센서 제작에 관한 연구가 진행되고 있다. 산소 포화도를 직접 혈액을 추출하지 않고 비추출식으로 측정하게 된다면, 최근 우리나라에서도 인공 심장이 개발되고 있으므로 인공 심장의 제어에 필요한 정보로써 산소 포화도를 신속 정확하게 공급할 수 있어 인공 심장의 정확한 재어가 가능하다. 그리고 반도체 기술을 이용하여 소형화가 가능하므로 생체 적용성(Biocompatibility)이 우수하고 다기능을 가진 센서를 만들 수 있다. 본 논문에서는 비추출식으로 산소 포화도를 측정하기 위한 투과광 방식과 반사광 방식의 기본 이론 및 센서의 설계를 위한 기본 이론을 분석하였다. 그리고, 적색광의 사용가능성을 테스트하기 위한 모의 실험도 행하였다.

• Journal of Biomedical Engineering Research
• /
• v.20 no.5
• /
• pp.573-579
• /
• 1999

본 논문은 2채널 센서를 이용한 펄스 옥시메터의 산소포화도 계산 모델의 설계 및 분석에 관한 것이었다. 또한 Beer Lambert 법칙에 의거하여 기존 알고리즘 및 새로운 알고리즘들을 이론적으로 분석하였다. 제안된 알고리즘은 손가락을 투과한 2개의 채널에서 나온 광신호를 각각 직류성분 Adc 와 맥동성문 Aasin wt. 잡음성분 Ahnoise , ALnoise 등으로 모델링한다. 모델링 되어진 광신호를 맥동성분이 적분비를 사용하여 고주파 동잡음인 AHnoise 를 제거한 후 각각 산소포화도 계산을 위한 상관계수 그래프를 구한다. 또한 2개의 채널에서 적분비를 사용하여 구해진 상관계수 그래프를 사용하여 산소농도를 추출하는 방법에 관하여 기술하였다. 맥동성분비와 관혈적인 측정에 의한 혈중 산소포화도와의 상관관계 그래프의 선형성을 확보하기 위하여 펄스 옥시메터 시뮬레이터 오차범위를 고려해 75~100%상이의 산소포화도를 중점적으로 관측하였고, 4주기로 면적계산주기를 결정하여 실험하였다. 본 연구에서 제안된 알고리즘의 성능평가는 맥동성분의 적분비를 이용한 방법과 비교하였다. 비교결과는 4주기의 면적계산 주기를 가졌을 때 기존의 방식보다 평균오차가 0.7%정도 향상되었으며, 회귀적선의 신뢰도를 보여주는 결정계수 ${\gamma}$$^2$도 0.995로 기존의 방식에서 나온 0.979보다 더 좋은 결과를 얻을 수 있었다. 따라서 2채널을 이용한 방법이 A Lnoise 제거와 성능면에서 우수하다는 결론을 얻을 수 있었다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2011.05a
• /
• pp.751-753
• /
• 2011

Pulse Oximeter is used two different wavelength light sources. Two signals measured by light transmission in the body parts. SPo2 is calculated from the measured signal. These optical methods is have the light absorption properties of oxygen in the blood. SPo2 is to be called vital signs of $5^{th}$and important in modern medical. But, exist pulse oximeter was used just user for viewing the SPo2. That was a lack of used communication Monitoring function. In this paper using the Bluetooth feature on the exist pulse oximeter to communicate with the outside of the Gateway for design medical devices standards protocol IEEE 11073-10404 built-in pulse oximeter. Also user can be monitoring the U-Health Gateway through the pass SPo2 information.

• Journal of Sensor Science and Technology
• /
• v.2 no.1
• /
• pp.75-80
• /
• 1993

This study describes a non-invasive optical sensor and system in order to obtain oxygen saturation of blood, in-vitro. The sensor contains LED 665nm and 805nm of wavelength for light source and PIN photodiode for light detector in flat pack. The sensor system for measurement of oxygen saturation has breadboarded, including signal amplifier, filter, displayer, A/D converter, microprocessor and memory. Experimental set-up for non-invasive measurement of oxygen saturation in-vitro was done. When the variation of oxygen saturation is compared with that of each wavelength, the variation of 665nm is more than that of 805nm by five times. As oxygen saturation varies from 100% to 60%, and the reflection ratio (R805/R665) is changed linearly. The oxygen saturation in $100%{\sim}60%$ range can be measured with about 5% resolution by the developed sensor, such that if this sensor connects with the main artery and vein, the artificial heart can be controlled rapidly and precisely from measurement of the sensor.

• Smart Media Journal
• /
• v.11 no.9
• /
• pp.30-38
• /
• 2022

It is important to grasp biometric data in real time for prompt action in the event of a safety accident at a work site where the risk of safety accidents exists. Among them, blood oxygen saturation is the most important factor in maintaining human life, so real-time oxygen saturation measurement and monitoring is necessary according to the situation as a preemptive response for worker safety management. By receiving real-time bio-signals from workers wearing health and life-risk protective clothing, and sharing and analyzing the worker's risk status in an external system, it is possible to diagnose the worker's current condition and efficiently respond to emergencies that may occur to the worker. In this paper, we propose a wearable oxygen saturation measurement platform technology that can monitor the risk of harmful gases and oxygen saturation of the wearer in real time and ensure the wearer's activity and safety in order to cope with emergency situations at the scene of an accident. If we overcome the limitations identified through the results of the proposed system later and apply improved biodata such as motion correction to the platform, we expect that it will be usable not only in hazardous gas environments, but also in hospitals and homes for emergency patients.

• The Journal of the Convergence on Culture Technology
• /
• v.7 no.1
• /
• pp.576-581
• /
• 2021

In the post-epidemic era, COVID-19 has not yet been fully controlled. Wearing masks is still the main means of epidemic prevention, and the negative effects brought by masks continue to continue. Wearing a mask for a long time can cause two problems. The first problem is hypoxia, and the other is an increase in psychological stress. To reduce the negative impact of masks, this paper proposes a new breathing mode. It is the "Umm~" vocal breathing mode, which simultaneously solves the two problems of hypoxia and increased stress. This paper explores the reasons why new breathing patterns can relieve stress. Explains the relationship between HRV and stress index and uses SDNN as an indicator to detect stress index to confirm the effectiveness of this breathing pattern. Experimental results prove that the "Umm~" vocal breathing mode can not only relieve the stress induced by wearing a mask. And when not wearing a mask, it can also be used to relieve daily stress. This method that anyone can easily implement should be more popularized.

• Journal of Naturopathy
• /
• v.11 no.2
• /
• pp.116-122
• /
• 2022

Background: Studies on the effect of abdominal or thoracic breathing therapy on sleep or blood oxygen concentration are still scarce. Purpose: This study was to examine the effect on blood oxygen saturation and pulse variability, changes in the severity of insomnia, changes in wakefulness before sleep, and dysfunctional beliefs and attitudes toward the Korean version of sleep in women in their 50s after healing with abdominal breathing and thoracic breathing. We investigated the effect. Methods: Subjects were investigated before and after the change of breathing (breathing) therapy for 12 weeks, 3 times a week, and 36 breaths perweek. Results: It wa evaluated respiratory healing as having no significance in the pulse rate change. However, oxygen saturation was significant in the experimental group, increasing to 93.60 SpO₂% before the respiratory rally and 96.5 SpO₂% after respiratory recovery (p < .002). In addition, the insomnia severity scale and dysfunctional beliefs about sleep significantly decreased after respiratory rally than before (p < .000). Conclusions: It evaluated that respiratory therapy for the subjects is beneficial to health as it is effective for insomnia, pulse, and oxygen saturation.