• 한국지구과학회지
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• 제22권2호
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• pp.89-95
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• 2001

이 논문의 목적은 대기압개념에 대한 오개념을 기초하여 컴퓨터 보조수업 프로그램을 개발하여 중학교 과학과정에 적용하고 그 개념개선 효과를 조사하는 것이다. 그 결과는 다음과 같다. 1) 대기압에 대한 오개념을 확인하였고 2) 분석된 오개념을 고려한 CAI프로그램을 개발였으며 3) 학습에 적용한 결과 CAI를 적용한 학습이 전통적 학습보다 성취도와 오개념 개선에 효과적이었다.

• 대한물리의학회지
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• 제18권2호
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• pp.13-21
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• 2023

PURPOSE: This study examined the specific clinical risk factors in middle-aged men with age-related loss of skeletal muscle mass (ALSMM). METHODS: The present research analyzed the data from a cross-sectional study of 1,564 community-dwelling participants aged between 40 to 49 years old. The participants were screened for ALSMM. The study examined various risk factors, including age, height, weight, body mass index, waist circumference, skeletal muscle mass index, smoking and drinking status, systolic and diastolic blood pressure, fasting glucose levels, and triglyceride and cholesterol levels. RESULTS: The risk factors of ALSMM were height, body mass index, waist circumference, skeletal muscle mass index, systolic blood pressure, diastolic blood pressure, drinking status, fasting glucose, and triglyceride levels (p < .05). The weight, triglyceride, and smoking status variables were non-significant (p > .05). CONCLUSION: The risk factors for ALSMM among community-dwelling adults were determined. These results are expected to contribute to the existing literature on ALSMM and provide potential risk factors associated with the development of ALSMM in middle-aged males.

• 환경위생공학
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• 제22권1호
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• pp.67-74
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• 2007

The purpose of this study is to provide the necessarily basic data of the ideal growth of the students by investigating the effect of the student's stress due to the parent's achievement pressure. The sample of this study are In students consisting of 51 boys and 49 girls in the 3rd grade classes of "J" middle school located in Siheung city, Kyungki-do. The observed materials are used to investigate the parent's achievement pressure and the level of stress. Based on the observed data, the frequency, correlation, and t-test have been gained. The results are summarized as follows : 1. The perception of the parent's achievement pressure is shown more by the boy's achievement pressure($44.2{\pm}9.9$) than the girl's achievement pressure($39.939{\pm}11.089$), among the high level students. 2. The perception of the parent's achievement pressure is shown more the high($43.0{\pm}10.7$) and middle($42.9{\pm}11.8$) level students than the low($39.7{\pm}8.00$) level students. 3. The stress of male students was high in the Solving Problem stress factor with by the mean of $15.1{\pm}3.7$, and the stress of female students was high in the Self-Control stress factor with the mean of $13.3{\pm}3.9$. 4. The stress of high, middle, low level student was high in the Solution of Matter stress factor with the mean of $14.2{\pm}3.9$. 5. The results were the main cause of the stress than the parent's achievement pressure.

• Wind and Structures
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• 제28권5호
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• pp.299-313
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• 2019

In order to examine the effects of different wind deflectors on the wind load distribution characteristics of extra-large cooling towers, a comparative study of the distribution characteristics of wind pressures on the surface of three large cooling towers with typical wind deflectors and one tower without wind deflector was conducted using wind tunnel tests. These characteristics include aerodynamic parameters such as mean wind pressures, fluctuating wind pressures, peak factors, correlation coefficients, extreme wind pressures, drag coefficients and vorticity distribution. Then distribution regularities of different wind deflectors on global and local wind pressure of extra-large cooling towers was extracted, and finally the fitting formula of extreme wind pressure of the cooling towers with different wind deflectors was provided. The results showed that the large eddy simulation (LES) method used in this article could be used to accurately simulate wind loads of such extra-large cooling towers. The three typical wind deflectors could effectively reduce the average wind pressure of the negative pressure extreme regions in the central part of the tower, and were also effective in reducing the root of the variance of the fluctuating wind pressure in the upper-middle part of the windward side of the tower, with the curved air deflector showing particularly. All the different wind deflectors effectively reduced the wind pressure extremes of the middle and lower regions of the windward side of the tower and of the negative pressure extremes region, with the best effect occurring in the curved wind deflector. After the wind deflectors were installed the drag coefficient values of each layer of the middle and lower parts of the tower were significantly higher than that without wind deflector, but the effect on the drag coefficients of layers above the throat was weak. The peak factors for the windward side, the side and leeward side of the extra-large cooling towers with different wind deflectors were set as 3.29, 3.41 and 3.50, respectively.

• Journal of Welding and Joining
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• 제23권1호
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• pp.41-47
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• 2005

Arc pressure is one of important factors in understanding physical arc phenomena. Especially it affects on the penetration, size and shape of TIG welding. Some researches were reported on the effect of arc pressure in low and middle current region. But there are not any research in high current region. The purpose of this study is to investigate the arc pressure distribution with mixing ratio of shield gas such as Ar and He gases. A Cu block with water cooling was specifically designed and used as an anode electrode in order to measure the arc pressure in high current region. Then, the arc pressure distribution was measured with change in welding current and mixing ratio of shield gases. The arc force was obtained by numerically integrating the measured results. As the results, it was shown that the arc pressure was concentrated at the central part of the arc in middle and high current regions when a pure Ar gas was used. In case of Ar + He mixing gas, the arc pressure was much lower than that of pure Ar gas. In addition, it was widely distributed to radial direction.

• 대한지역사회영양학회지
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• 제2권3호
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• pp.327-337
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• 1997

The purpose of this study was to investigate the differences in anthropometric, hematologic, and lipidologic data between normocholesterolemia and hypercholesterolemia and influencing factors in hypercholesterolemia in middle-aged men in Kwang-ju. 179 middle-aged men were involved. Anthropometric data(body weight, height, body circumferences and skinfold thickness) and hematologic data(blood pressure, fasting blood glucose, albumin and hemoglobin) were measured. Bleed lipid profile(total cholesterol, tr- iglyceride, phospholipid, HDI-cholesterol, LDL-cholesterol and VLDL-cholesterol) were analyzed. To determined using questionnaire. The subjects were classified as hypercholesterolemic based on The Guideline for Korean Hyperlipidemia. body mass index, systolic blood pressure, waist and hip circumference, and triceps, subcostal, abdomen, subscapular and suprailliac skinfold thicknesses of the hypercholesterolemic group were significantly higher than in the normocholesterolemic group. The concentrat- ion of cholesterol, triglyceride, phospholipod. HDL-cholesterol, LDL-cholesterol and VLDL -cholesterol of the hypercholesterolemic group were significantly higher than normocholesterolemic group. The concentration of cholesterol has a significantly positive correlation with body mass index, diastolic blood pressure, waist circumference, waist/thigh ratio and skinfold thickness(triceps, subcostal, abdomen, and supraillic skin- fold thickness). The general tendency of socioeconomec status, frequencyu of meat intake, smoking amounts and duration and duration and drinking frequencies and amount were higher in the hypercholesteolemic group but not significant. In conclusion, hypercholesterolemia in middle-aged men was closely correlated with upper body fat obesity and most of them had an accompanied high triglyceride level tendency.

• 지역사회간호학회지
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• 제19권4호
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• pp.545-553
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• 2008

Purpose: This study was conducted to test the effect of a 12-week exercise program on body composition. blood pressure, blood glucose, blood lipid and bone mineral density for middle-aged and aged women in rural areas. Methods: The subjects were 33 women at the age of 40-75. For statistical analysis, descriptive statistics and paired t-test were used with SPSSWIN 16.0. Results: The results were summarized as follows. First, body weight, BMI. % body fat. abdominal adipose, and waist circumference of the women decreased significantly after implementing the 12-week exercise program. Second, diastolic blood pressure, serum cholesterol, triglyceride, and LDL decreased significantly, and the HDL level increased significantly after the 12-week exercise program. Third, bone mineral density did not increase significantly after the program. Conclusion: These results suggest that the exercise program has an effect in decreasing body composition, and improving blood pressure, blood glucose, and blood lipid in middle-aged and aged women.

• 대한의생명과학회지
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• 제19권1호
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• pp.55-60
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• 2013

This study was to know the effects of massage on the back region in order to reduce stress in middle age women. To investigate the effects of massage to the stress levels of middle aged women, we evaluated blood pressure (BP), heart rate variability (HRV), and ultrasonography before and after back massage. The blood pressure after massage was reduced when compared to that of pre-massage. The HRV spectrum analysis was used Frequency domain analysis such as Mean HRV, normalized low frequency (norm LF), norm high frequency (norm HF), and LF/HF ratio. Post-massage BP tended to be low, but not statistical significant. After Massage, the Mean HRV, norm LF, and LF/HF ratio were significantly reduced, while norm HF was significantly increased as compared with pre-massage. The muscle layer and fat layer were significantly diminished by massage. The study was suggested that massage may be an effective treatment for relief of stress.

• 대한시과학회지
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• 제20권4호
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• pp.461-468
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• 2018

목적 : 전기를 띄는 천연광석물질인 토르말린을 안경 전체부분에 적용하여 인간의 안구 내 신진대사에 관련된 요소들 중 하나인 안압(Intraocular pressure: IOP)의 변화를 관찰하였다. 방법 : 안경테의 주재료인 TR-90과 토르말린 7 wt%을 혼합하여 안경테를 제작 후, 20대의 90명(남자 46명, 여자 44명)을 대상으로 토르말린 안경테의 착용 전과 후의 안압변화를 정상 안압범위에서 Low, Middle, High 그룹으로 안압에 따라 나누어 관찰하였다. 결과 : 토르말린 안경테를 착용 후, 우안에서 전체안압은 -4.14 %로 감소하였고(p<0.000), High와 Middle 그룹에서 각각 -6.39 %(p<0.000), -4.64 %(p<0.017)로 유의하게 감소하였다. 좌안에서 전체안압은 -2.74 %(p<0.004)로 감소하였고, High 그룹에서만 -4.58 %(p<0.000)로 통계적으로 유의한 값을 나타내었다. 결론 : 본 연구에서 제작한 7 wt% 토르말린이 함유된 안경테를 사용하여, 안경테를 착용 후 안압이 유의하게 감소되어 정상 안압범위의 평균 수치와 근접해지는 것을 확인할 수 있었다. 이러한 연구결과로 인해 신체의 신진대사와 혈액순환을 촉진시키는 효과를 가진 토르말린을 안경테에 접목함으로써 안압의 정상화에 대한 효과를 나타내는 것으로 확인할 수 있었다.

• 한국전문물리치료학회지
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• 제18권2호
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• pp.76-83
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• 2011

The aim of this study was to determine the immediate effects of single treatment of strain-counter strain (SCS) on pressure pain threshold (PPT) and muscle activity during scapular plane abduction with 3% body weight load. Fifteen asymptomatic male adults with upper trapezius latent trigger point (LTrP) (PPT<2.9 $kg/cm^2$) participated in this study. Pressure algometer was used to measure PPT and surface electromyography was used to record upper, middle arid lower trapezius, serratus anterior, infraspinatus and middle deltoid muscle activity and relative ratio during scapular plane abduction between pre- and post-intervention. There was a significant increase in upper trapezius PPT after a 90-second SCS (p<.05). The activity of the upper trapezius and middle deltoid was significantly decreased (p=.014, p=.001), coupled with a decreased muscle activity ratio between the upper and lower trapezius (p<.05). These results indicate that the SCS may effectively deactivate upper trapezius activity, thereby alleviating muscle balance and reducing pain sensitivity.