• 한국통신학회논문지
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• 제35권2B호
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• pp.232-243
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• 2010

본 논문에서는 다양한 생체신호들을 이용하여 심리상태와 생체정보를 판별하고, 외부환경 정보와 함께 이용자의 현재 상황을 인식하여 그에 맞는 적절한 서비스를 제공하는 생체정보기반 상황인식시스템(Bio-Signal Context aware system :BSC)을 설계하고 구현한다. 본 논문에서 구현한 생체정보기반 상황인식시스템은 센서를 통하여 측정된 뇌파(EEG), 심전도(ECG), 피부전도도(GSR) 등의 생체신호들로부터 특징들을 추출하고 분석하였으며, 분석된 결과를 입력받아 평온, 집중, 긴장, 우울의 네 가지 심리상태를 판별하였다. 판별된 심리상태의 결과와 함께 심박변이도(HRV), 피부전도도, 체온 등의 생체신호로부터 분석된 생체 상황정보, 그리고 외부 환경의 상황정보로부터 이용자의 현재 상황을 추론하고 인식하여 현재 생체 상황에 맞는 적절한 서비스를 제공하였다.

• 한국의류학회지
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• 제43권6호
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• pp.866-876
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• 2019

This study examined the physiological and psychological effects of wearing gloves at rest in a cold environment. Seven elderly females participated in two separate trials: wearing gloves (WG) and bare hands (BH). The experiment was conducted for 60 min in a climatic chamber (air temperature 7.8±0.3℃ with 44±2%RH) with a sedentary posture. Microclimate temperature on the left palm was 4.16℃ higher in WG compared to that in BH (p<.1). Microclimate temperature on the chest during the last 5 min increased compared to the initial 5 min only in WG (p<.05). During the last 5 min, skin temperatures at the arm and hand in WG were higher than those in BH (p<.05). There was no statistical difference in the change of rectal temperature between WG and BH. Heart rate in BH was significantly higher compared to the WG (p<.05). Subjects also felt less cold on the whole body and hand in WG than those in BH (p<.05). The findings indicate that wearing gloves for elderly females affected the distribution of skin temperature and cardiovascular response in cold environments. Elderly females should be informed about the importance of wearing gloves through the clothing guideline in winter.

• 한국의류산업학회지
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• 제8권1호
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• pp.123-128
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• 2006

For the purpose of examining the relationship of physiological and subjective responses to different exercise intensities and varied types of sportswear material, under environmental condition $20{\pm}1^{\circ}C$ $50{\pm}3%$RH, five men who wear four different kinds of sportswear which have same clothing cover area. The subjects exercised for 20 min with a 20 min pre-exercise rest period and another 20 min post-exercise recovery period. Throughout the 60 min. duration, we monitored the local skin temperature, rectal temperature, clothing microclimate and subjective sensation. The mean skin temperature was recorded to range from $33.5{\sim}34.1^{\circ}C$ for the entire duration of the experiment with the highest temperature observed at the 7th min after starting the exercise. During the exercise intensity at THR 20, the lowest recorded temperature was at the 5th min of the recovery time and stabilized at the 10th min. However, in the exercise intensity condition at THR 70, the temperature declined steadily until the end of the experiment. With regard to clothing materials, cotton 100% and Polyester/Cotton blended fabrics knit(35/65) was $0.5{\sim}0.7^{\circ}C$ maintained lower than Polyester 100% and polyester/Cotton blended woven fabrics (65/35). In the case of the rectal temperature at THR 70 in case of PET 100%, Polyester/Cotton blended woven fabrics (35/65) was higher $0.2{\sim}0.5^{\circ}C$ than other sportswear throughout the duration of the experiment.

• 산업경영시스템학회지
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• 제41권4호
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• pp.1-8
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• 2018

Whole body fatigue detection is an important phenomenon and the factors contributing to whole body fatigue can be controlled if a mathematical model is available for its assessment. This research study aims at developing a model that categorizes whole body exertion into fatigued and non-fatigued states based on physiological and perceived variables. For this purpose, logistic regression was used to categorize the fatigued and non-fatigued subject as dichotomous variable. Normalized mean power frequency of eight muscles from 25 subjects was taken as physiological variable along with the heart rate while Borg scale ratings were taken as perceived variables. The logit function was used to develop the logistic regression model. The coefficients of all the variables were found and significance level was checked. The detection accuracy of the model for fatigued and non-fatigues subjects was 83% and 95% respectively. It was observed that the mean power frequency of anterior deltoid and the Borg scale ratings of upper and lower extremities were significant in predicting the whole body fatigued when evaluated dichotomously (p < 0.05). The findings can help in better understanding of the importance of combined physiological and perceived exertion in designing the rest breaks for workers involved in squat lifting tasks in industrial as well as health sectors.

• 한국의류학회지
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• 제43권3호
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• pp.405-415
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• 2019

This study examined the physiological and psychological effects of wearing a winter cap at rest in a cold environment. Seven older males participated in two separate trials: wearing a winter cap (CAP) and non-wearing a winter cap (CON). The experiment was conducted for 60 min in a climatic chamber (air temperature $7.8{\pm}0.3^{\circ}C$ with $43{\pm}2%RH$) with sedentary posture. Microclimate temperature at the vertex of the head was $6.88^{\circ}C$ higher in CAP compared to CON (p<.01). Microclimate humidity at the vertex was lower in CAP than in CON only during the last 5 min (p<.01). Skin temperature at the forehead in CAP was higher than in CON (p<.01). During the last 5 min, rectal temperature was higher in CAP than that in CON (p<.05). Unlike CAP, the heart rate in CON during the last 5 min decreased significantly compared to the initial 5 min (p<.05). Subjects also felt less cold on the head/face in CAP than that in CON (p<.01). The results indicate that wearing a cap for elderly males positively affected body temperature regulation and cardiovascular response in cold environments. The importance of wearing warm hats for elderly males in winter should be emphasized.

• 인간식물환경학회지
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• 제24권1호
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• pp.107-117
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• 2021

Background and objective: The purpose of this study is to investigate the effect of a forest healing program in terms of depression, neuropsychological and physiological benefits for the elderly. Methods: For this purpose, we developed a forest therapy program for the elderly who are vulnerable to dementia and conducted a total of 11 sessions of forest therapy activities in a forest once a week. We measured the changes in depression, resting-state Electroencephalography(EEG) and heart rate variability (HRV) before and after the program. There were 60 subjects aged over 65 yesrs old. 30 subjects participated in the forest therapy program, and the other were in the control group. The Geriatric Depression Scale was used to measure the level of depression, neuroNicle FX2 (Laxtha, Korea) was used to measure the resting-state EEG, and photoplethymogram (ubpulse T1, Laxtha, Korea) was used to measure the HRV. Results: The results showed that the depression index of the experimental group improved with statistical significance after the program (experiment group = 3.267 decrease of the mean). In the EEG measurement, the alpha-peak frequency at rest (experimental group = 0.227 Hz increase of the mean) was improved (mean increase = 0.23 in the experimental group, p < .05). The high frequency of HRV, which represents the parasympathetic nerve activity of the body's autonomous response, was also significantly improved (mean increase = 0.396 in the experimental group, p < .05). Conclusion: The results suggest that the forest therapy program can reduce the cognitive, psychological and physical risk factors of dementia for the elderly at risk of cognitive decline. Therefore, forest therapy activities may be suitable for the prevention of dementia in the elderly.

• 대한핵의학회지
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• 제27권2호
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• pp.203-209
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• 1993

Dipyridamole은 정맥주사시 매우 안전한 것으로 알려져 있으며 일반적으로그 약물효과는 혈압강하와 심계항진에 의한 증상이 대부분이다. 저자들은 dipyridamole 부하 심근 SPECT를 시행한 847명 환자에서 dipyridamole에 대한 반응양상과 부작용에 대해 조사하였다. 대상환자는 847명으로 이들 중 혈압과 맥박수의 측정기록이 있는 702명에서 심근의 관류결손부위에 따른 헐압과 맥박수의 곱과 곱의 비를 분석하여 dipyridamole에 대한 반응을 조사하였다. 1) Dipyridamole 투여후 나타난 부작용으로는 흉통이나 흉부불쾌감(20.3%)이 가장 많았고 두통이 14.8%, 숨이 차다고 한 예가 4.6%, 복통이 4.3%, 어지러움이 2.2%의 빈도를 보였다. 2) Dipyridamole 투여후 대부분의 환자에서 혈압감소를 보여 93.6%에서 혈압이 감소하였고, 0.9에서 혈압의 변동이 없었고, 5.5%에서는 오히려 혈압이 증가하였다. 3) Dipyridamole 부하전의 맥박수에 비해 10%이상의 증가를 보이지 않은 경우는 전체 대상환자의 8.3%였다. 당뇨환자의 16.9%, 비당뇨환자의 6.7%에서 맥박수의 증가를 보이지 않았다(p<0.005). 4)심근 SPECT상 관류결손이 없는 234명에서 연령과 RPPr의 관계는 연령이 증가함에 따라 RPPs/RPPr는 감소하는 경향을 보였다. 관류결손이 있는 환자 468 명에서도 연령과 RPPs, RPPs/RPPr이 같은 결과를 보이고 있다. 5) 휴식기 심근의 관류결손이 있는 환자군에서 심근의 관류결손의 크기와 RPPr과 RPPs/RPPr은 관련이 없었다. Dipyridamole에 의한 반응으로 비전형적인 반응을 보인 경우는 혈압증가가 5.5%, 맥박의 증가가 없는 경우가 8.3% 였다. 혈압과 맥박수의 곱 또는 곱의 비와 연령과의 관계는 휴식기 심장부하가 많은 고령의 환자에서 증가되어 있었으며 dipyridamole부하에 의한 심장부하량은 나이가 많은 환자에서 적어짐을 시사하였다. 관류결손이 있는 환자와 없는 환자에서 dipyridamole부하로 인한 심장부하량에는 유의한 차이가 없었다. Dipyridamole에 의한 부작용은 흉통, 두통, 복통 등의 순이었고 전예에서 호전되었으며 생명에 위험을 초래할 수 있는 정도의 심장마비나 심부정맥은 한 예에서도 없었다. 결론적으로 dipyridamole은 약물부하 심근 SPECT 검사에 안전하게 사용할 수 있는 약물로 사료된다.

• 생명과학회지
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• 제19권5호
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• pp.625-632
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• 2009

결과적으로 본 연구에서 서로 다른 두 집단(RTG, ATG)의 비교시 저항성 트레이닝 집단(RTG)보다 유산소 트레이닝 집단(ATG)에서 산화질소(NO) 농도가 더 높게 나타났으며, 이는 지속적인 유산소 형태의 트레이닝이 간헐적인 저항성 형태의 트레이닝 보다 더 많은 산화질소(NO)가 생성 된다는 것을 알 수 있었다. 또한 심박수(HR)와 혈압(BP), 평균동맵압(MAP)의 감소에도 저항성 트레이닝(RT)보다는 유산소 트레이닝(AT)이 효과적이라는 것을 알 수 있었다. 그러나 유산소 트레이닝(AT)에 비해 저항성 트레이닝(RT)에서 유의하진 않았지만 산화질소(NO) 농도가 증가된 것은 주목할 만한 결과이다. 이러한 결과로 볼 때, 단기간일 지라도 혈관이완 및 자율신경계 도움을 줄 수 있는 것은 유산소 트레이닝(AT) 임을 알 수 있었고 이는 일반적으로 운동을 선택할 시(근력과 근비대를 제외한 운동) 도움을 줄 수 있다고 사료된다. 또한 추후 연구에서는 12주 이상의 장기간의 트레이닝을 통해 저항성 트레이닝(RT)이 혈관이완의 직접적인 척도인 산화질소(NO) 농도에 관한 연구가 필요시 된다.

• Journal of Chest Surgery
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• 제6권2호
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• pp.131-142
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• 1973

Studies of cardiopulmonary function and acid-base balance were performed on 29 dogs during control period, during oligemic hypotension and following return of blood to the animals. Intravenous morphine and local anesthesia were used. Fifteen of the 29 animals survived the complete experiment. The 14 animals that failed to survive the experimental period died between 15 to 90 minutes after the onset of bleeding. The results were as follows. 1. The heart rate increased after the onset of bleeding and failed to return to control level following reinfusion. Stroke volume decreased markedly after bleeding and failed to recover after return of blood from the reservoir. Cardiac output also decreased during oligemic hypotension and was maintained at this level after re-infusion. Total peripheral resistance decreased significantly immediately after bleeding, however it increased soon over the pre-bleeding level. Central venous pressure decreased after the onset of bleeding and remained at lower level for the rest of the experimental period. Arterial blood pressure, clown to 40-45 mmHg by acute hemorrhage, was elevated near to control level. Left ventricular work decreased tremendously during oligemic hypotension and failed to return to control level with the re-infusion of blood. Hematocrit value showed no significant decrease after bleeding and increased after re-infusion. Hemoglobin decreased after the onset of bleeding and recovered to control value after re-infusion. 2. The respiratory rate fell rapidly after bleeding from 124 to 29 and remained at this lower level for the remainder of the experiment. The tidal volume increased after bleeding and was maintained at this level for the remainder of the experiment. The respiratory minute volume showed no significant changes throughout the experimental period. Oxygen consumption fell lightly in all animals during oligemic hypotension and returned to normal levels following re-infusion. Arterial oxygen content and arterial oxygen saturation decreased following bleeding and the values returned to normal levels after the return of blood from the reservoir The arterio-venous oxygen difference increased after the onset of bleeding. It failed to return to normal values following re-infusion. Arterial $Pco_2$ decreased in all animals after the beginning of the bleeding. Partial pressure of $Co_2$ continued to fall until re-infusion, after which the values returned toward normal. Animals became acidotic. The pH fell to lower level following bleeding. Lactic acid and lactate: pyruvate ratio also increased during same period. Arterial pH and lactic acid failed to return to control value and lactate: pyruvate ratio increased more after re-infusion. Sodium bicarbonate decreased after bleeding and returned to control value following re-infusion.

• 한국의류산업학회지
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• 제24권5호
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• pp.655-665
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• 2022

This study evaluated the validity of a newly developed mobility protocol examining the comfort functions and requirements of personal protective equipment (PPE) for COVID-19 healthcare workers. Eight males (age: 24.7 ± 3.0 y, height: 173.4 ± 2.3 cm, and body weight 69.9 ± 3.7 kg) participated in the following three PPE conditions: (1) Plastic gown ensemble, (2) Level D ensemble, and (3) Powered air purifying respirator (PAPR) ensemble. The mobility protocol consisted of 10 different tasks in addition to donning and doffing. The 10 tasks were repeated twice at an air temperature of 25oC with 74% RH. The results showed significant differences among the three PPE conditions in mean skin temperature, local skin temperatures (the forehead, thigh, calf, and foot), clothing microclimate (the chest and back), thermal sensation, thermal comfort, and humidity sensation, while there were no significant differences in heart rate or total sweat rate. At rest, the subjects felt less warm and more comfortable in the PAPR than in the Level D condition (P<0.05). However, subjective perceptions in the PAPR and Level D conditions became similar as the tasks progressed and mean skin and leg temperature became greater for the PAPR than the Level D condition (P<0.05). An interview was conducted just after completing the mobility test protocol, and suggestions for improving each PPE item were obtained. To sum up, the mobility test protocol was valid for evaluating the comfort functions of PPE for healthcare workers and obtaining requirements for improving the mobility of each PPE item.