수중운동시 잠수복착용 피검자의 열 평형. 특히 잠수장갑 및 버선착용의 영향

최장규,홍성원,박양생 고신대학교 의학부 1986 高神大學校 醫學部 論文集 Vol.2 No.1

In 5 wet-suited subjects, changes in body temperature and heat exchanges were studied at rest and during exercise in water of 17℃. The subjects were protective gloves and boots in one series and none of these in the other in order to evaluate the effect of selective cooling of hands and feet on the response of the thermoregulatory systems. When the subjects were resting in water the rectal and mean skin temperature changes, the metabolic heat production, the overall body insulation and the heat loss through the skin were not apparently altered by protecting hands and feet. However, during exercise in water, the mean skin temperature was maintained at 2~3℃ higher level and the rectal temperature at a similar (during light exercise) or slightly(15℃) lower (during heavy exercise) levels with the protection than those without the protection. Although the core to skin temperature gradient was lower in the former than in the latter situation the rate of skin heat loss appeared to be similar due to the overall insulation of the body was lower in the former than in the latter. The steady-state local skin temperature at trunk and extremities during exercise was significantly higher with the protection of hands and feet than those without the protection, the difference being increasingly greater at more distal parts of extremities. These results indicate that in wet suit divers working in cold water (of approximately 17℃) the protection of hands and feet by wearing gloves and boots induces less intensive vasoconstriction (hence lower thermal insulation) at the peripheral tissues, especially at the limbs. As a consequence, the protection of hands and feet is ineffective in reducing body heat loss. However, it may be particularly significant in maintaining the skin temperature high for the subject's comfort and also in preventing hyperthermia which may be induced during very high levels of exercises.

동구기행

최장규,Choe, Jang-Gyu 대한건축사협회 1990 建築士 Vol.1990 No.11

수중운동시 잠수복착용 피검자의 열 평형. 특히 잠수장갑 및 버선착용의 영향

최장규,홍성원,박양생 고신대학교(의대) 고신대학교 의과대학 학술지 1986 고신대학교 의과대학 학술지 Vol.2 No.1

In 5 wet-suited subjects, changes in body temperature and heat exchanges were studied at rest and during exercise in water of 17℃. The subjects were protective gloves and boots in one series and none of these in the other in order to evaluated the effect of selective cooling of hands and feet on the response of the thermoregulatory systems. When the sujects were resting in water the rectal and mean skin temperature changes, the metabolic heat production, the overall body insulation and the heat loss through the skin were not apparently altered by protecting hands and feet. However, during exercise in water, the mean skin temperature was maintained at 2~3℃ higher level and the rectal temperature at a similar(during light exercise) or slightly(1.5℃) lower (during heavy exercise) levels with the protection than those without the protection. Although the core to skin temperature gradient was lower in the former than in the latter situation the rate of skin heat loss appeared to be similar due to the overall insulation of the body was lower in the former than in the latter. The steady-state local skin temperature at drunk and extremities during exercise was significantly higher with the protection of hands and feet than those without the protection, the difference being increasingly greater at more distal parts of extremities. These results indicate that in wet suit divers working in cold water (of approximately 17℃) the protection of hands and feet by wearing gloves and boots induces less intensive vasoconstriction (hence lower thermal insulation) at the peripheral tissues, especially at the limbs. As a consequence, the protection of hands and feet is ineffective in reducing body heat loss. However, it may bbe particularly significant in maintaining the skin temperature high for the subject's comfort and also ini preventing hyperthermia which may be induced during very high levels of exercises.

보온장갑 착용이 잠수복 착용 잠수사의 열 평형에 미치는 영향

최장규,연동수,박양생 고신대학교 의학부 1985 高神大學校 醫學部 論文集 Vol.1 No.1

The effect of wearing protective gloves on the thermal exchanges in cold water was studied in 4 Korean women wet suit divers. The subject was immersed in the water of critical temperature (average temperature was 16.5℃) and rested for 3 hours. The steady-state rectal temperature was lower with gloves(37.01±0.10(SE)℃) than without gloves (37.31±0.1℃), the different being statistically significant (P<0.05). On the other hand, the metabolic heat production was 17% higher with gloves (52.63±4.90(SE)kcal/hr ㎡) than without gloves(44.93±2.49). Consequently, the total peripheral insulation was reduced (19%) by wearing gloves. At a given average skin temperature the threshold rectal temperature for shivering was approximately 0.5℃ higher without gloves than with gloves. These results suggest that 1)the total insulation of the wet suited subject is effectively increased by selective cooling of the hand, and 2)the metabolic response to body cooling is sensitively affected by the skin temperature of the distal extremities. The practical implications of these finding are discussed.

아스팔트 포장의 품질측정을 위한 확률이론과 PWL방법의 비교 분석

최장규,이석근,김성민,황상민 한국도로학회 2009 한국도로학회논문집 Vol.11 No.2

본 연구는 국내에 적합한 지불규정을 도입하기 위해 아스팔트 포장의 품질측정 방법을 제시하고자 수행되었다. 지불규정은 통계이론을 바탕으로 포장의 품질을 결정하여 시공비용을 조정하는 방법으로 지불규정을 적용하는 미국 대다수의 주에서는 고유의 품질테이블을 이용해 PWL(Percent With in Limit)을 산정한다. 따라서 미국 South Carolina에서 적용중인 품질측정테이블을 사용한 PWL과 통계분석방법에 기초한 확률이론의 비교분석을 통해 PWL의 국내 적용여부의 가능성을 판단하였다. 시험포장구간의 데이터를 사용하여 통계이론을 이용해 산출한 확률값과 PWL을 미국AASHTO에서 제시한 지불계수(Pay Factor)에 대입한 결과는 큰 차이를 보이지 않았으며 확률값 도출을 위한 Z-Value 산출과정에서 모집단의 평균을 추정해 계산한 확률값 역시 PWL과 유사한 값을 보였다. 또한 현행 아스팔트 포장의 시방규정을 만족하지만 표준편차가 큰 가상의 데이터를 이용하여 지불계수를 산정한 결과 데이터의 평균값은 현행 시방규정에 만족하지만 지불계수는 100%이하로 산정되는 경우가 있는 것을 알 수 있었다. 이는 PWL방법을 이용함으로써 균질하고 성능이 우수한 품질의 측정이 가능한 것을 의미하며 따라서 국내실정에 접합한 품질측정테이블을 개발하여 PWL을 국내 지불규정의 품질측정방법으로 사용하는 것이 적합한 것으로 판단되었다. This study was conducted to suggest resonable quality measurement methods of asphalt pavements to be used in the Pay adjustment. The Pay adjustment is a method to adjust the construction cost according to the pavement quality based on the statistic theories. Many U.S states use Pay adjustment and the PWL(Percent with in Limit) is calculated using their quality index tables. In this study, the application of PWL in Korea was evaluated by comparing the PWL South Carolina with the probability theories. The probability values and the PWL obtained using the data collected from the test roads were used to determine the pay factors suggested by AASHTO and the pay factors between them were closed to each other. In addition, the PWL was very similar to the probability obtained using the predicted average of the population when calculating the Z-values. The pay factors were obtained using artificial data whose average satisfied the codes and whose standard deviation was large. The pay factors were less than 100% in the quality measurements can be performed using the PWL methods, and with the development of the korea quality index table, the PWL methods can be applied in korea

보온장갑 착용이 잠수복 착용 잠수사의 열 평형에 미치는 영향

최장규,연동수,박양생 고신대학교(의대) 고신대학교 의과대학 학술지 1985 고신대학교 의과대학 학술지 Vol.1 No.1

The effect of wearing protective gloves on the thermal exchanges in cold water was studied in 4 Korean women wet suit divers. The subject was immersed in the water of critical temperature(average temperature was 16.5℃) and rested for 3 hours. The steady-state rectal temperature was lower with gloves(37.01±0.10(SE)℃) than without gloves(37.31±0.1℃), the different being statistically significant(P<0.05). On the other hand, the metabolic heat production was 17% higher with gloves(52.63±4.90(SE) kcal/hr·m²) than without gloves(44.93±2.49). Consequently, the total peripheral insulation was reduced(19%) by wearing gloves. At a given average skin temperature the threshold rectal temperature for shivering was approximately 0.5℃ higher without gloves than with gloves. These results suggest that 1)the total insulation of the wet suited subject is effectively increased by selective cooling of the hand, and 2) the metabolic rersponse to body cooling is sensitively affected by the skin temperature of the distal extremities. The practical implications of these findings are discussed.

수중운동시 잠수복착용 피검자의 열 평형, 특히 잠수장갑 및 버선착용의 영향

최장규,홍성원,박양생 高神大學 醫學部 1986 高神大學醫學部 論文集 Vol.2 No.1

잠수복 착용 피검자에서 침수시 잠수장갑 및 버선 착용에 따른 체온조절기능의 변화

최장규,김정숙,박양생 高神大學 醫學部 1988 高神大學醫學部 論文集 Vol.4 No.1

잠수복 착용 피검자에서 침수시 잠수장갑 및 버선 착용에 따른 체온조절기능의 변화

최장규,김정숙,박양생 고신대학교(의대) 고신대학교 의과대학 학술지 1988 고신대학교 의과대학 학술지 Vol.4 No.1

In 5 wet-suited subjects, changes in body temperature, heat exchanges and thermal insulations were studied at rest and during exercise in water of 13℃. The subjects wore neoprene gloves and boots in one series and exposed their hands and feet to water in the other series of experiments. In the subjects resting in water, the gloves and boots did not affect the level of rectal temperature but increased the mean skin temperature slightly, reducing the core-to-skin temperature gradient. However, the total thermal insulation of the subject was reduced significantly and consequently the rate of skin heat loss was increased by wearing gloves and boots. The metabolic response of the subject appeared to be significantly augmented by wearing gloves and boots. In exercising subjects the level of body temperature and the thermo-regulatory variables were not apparently changed by wearing gloves and bootss. These results indicated that in wet-suited subjects resting in cold water, exposure of hands and feet increases peripheral insulation and consequently effectively reduces heat loss to water. Such an effect of peripheral cooling is lost during exercise by hypermia to skeletal muscles in the limbs.

보온장갑 착용이 잠수복 착용 잠수사의 열 평형에 미치는 영향

최장규,연동수,박양생 高神大學 醫學部 1985 高神大學醫學部 論文集 Vol.1 No.1