• Human Ecology Research
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• v.61 no.3
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• pp.429-443
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• 2023

The purpose of this study was to investigate whether internal control, autonomous motivation of middle school students, and perceived parental pressure on academic performance affect academic procrastination, while verifying the moderating roles of autonomous motivation and parental pressure on academic performance. The participants were a total of 371 middle school students. Academic procrastination, internal control, autonomous motivation, and parental pressure on academic performance were measured using the Procrastination Inventory (Aitken, 1982) revised by Jeon and Park (2014), the Internal-External Control Scale (Ko, 2014), the Academic Self-Regulation Questionnaire (Ryan & Connell, 1989) revised by Kim (2002), and the Scale of Kang (2003), respectively. The collected data was analyzed using SPSS 26.0 and a Process Macro Model 2 (multiple additional modulation effect). The results of the study are summarized as follows. First, middle school students' internal control, autonomous motivation, and perceived parental pressure on academic performance directly affected the students's academic procrastination. Second, the moderating role of parental pressure on academic performance was significant. On the other hand, the moderating role of autonomous motivation was not significant. In conclusion, the results of this study suggest that in order to reduce and prevent academic procrastination it is important to improve internal control by helping middle school students become confident enough to believe that they have the ability to change their behavior and achieve their aims. At the same time, parents need to be interested in the process rather than only the academic performance of their children and support their autonomy.

• Journal of the Korea Fashion and Costume Design Association
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• v.23 no.3
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• pp.1-10
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• 2021

Harnesses are used in a variety of industries, such as rescue operations, medicine, and entertainment. However, conventional harnesses have problems as they are uncomfortable to wear and causes continuous pain. Therefore, in this study, the load and pressure applied to the body in the flying state when using a conventional harness were measured in real time and the distribution change was observed. Load and pressure were measured using a modified corset harness, a pressure sensor, and a human mannequin to measure the maximum and average pressure on the waist. As a result, it was confirmed that the load concentrated on the waist in the flying state was 104 N, and the pressure was applied to the left and right sides was 800 kPa or greater. The pressure distribution showed a pressure of 3-45 kPa in 73% in all measurable pressures. The results of the load and pressure distribution are presented as basic data for improving the wearability and reducing the discomfort of harnesses in the future, aid in the development of a harnesses that can minimize discomfort for various activities, and increase the concentration on experiential activities. In addition, using the CLO 3D program, which is a 3D virtual wearing system, a harness was put on a virtual model, and the compression level was checked and compared with the actual pressure distribution. As a result of comparing the measured pressure values in the flying state with the clothing pressure wearing the harness in the CLO 3D program, the total pressure value was found to be about 68% of the actual measured value. This helps develop a harness that can minimize discomfort during activities by predicting the load and pressure on the body by first applying new designs to a virtual wearing system during development. These new harness patterns can solve the problems of conventional harnesses.

• Korean Journal of Human Ecology
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• v.7 no.1
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• pp.205-216
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• 1998

The objectives of this study were to investigate some problems related to health and to identify citizen's needs related to nutrition education program. The data were analyzed by using $x^2$-test, t-test, ANOVA and multiple range test. The food habits score was 70.0 of 100. The score of man was 69.0, while that of woman was 72.6. Since woman's food habit was better than man, education to man is more needed. Man's BMI was 22.5 and that of woman was 21.4. W/H ratio of man was 0.85 and that of woman was 0.80. BMI and W/H ratio increased as age increases. Systolic blood pressure was 123.5mmHg and diastolic blood pressure was 83.2mmHg. All age groups need the education of blood pressure control. Since subjects who did regular exercise were only 26.3%, these community people needed more regular exercise, specially woman. It turned out that subjects were afraid of cancer, hypertension, cerebral vascular diseases which are related with food habits. The disease or symptom having the highest mobility were dental disease, gastroenteric disorder, headache and constipation. They asked for counselling about health, diet therapy, protection methods of disease and menu planning etc. The program of education for health and good food habits should be developed according to subjects's age, sex, education etc. These results showed primary needs on the curriculum of citizen's education program for enhancing health. In addition, we suggest the research on the practical curriculum of nutrition education program.

• Korean Journal of Human Ecology
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• v.19 no.3
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• pp.577-588
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• 2010

This study was conducted to investigate the changes in alcohol consumption of male university students in Daegu, Korea and their drink-related behavior. The study focused on these changes over a decade using self-administered questionnaire surveys and health examinations that were carried out at a university campus in 1999 and in 2009. In both years more than 85% of students responded that they drank alcohol. However, significant increases in the frequency and amount of alcohol consumption were found (p<.001). The main influence on students' drinking behavior was friends/peers in both years. The most frequently preferred alcohol of respondents was so-ju (a traditional Korean liquor) in both years. However, the most frequently preferred type of food to accompany drinking had significantly changed (p<.01). Other changes including the increase of drinking speed and smoking during drinking were found to have significantly changed (p<.05) while significant difference regarding the decrease in food intake during drinking was not found. No significant difference in the amount of alcohol consumed was noted between underage drinkers and drinkers of above the legal drinking age. Heavy drinkers in the 2009 population had significantly higher systolic blood pressure than non-drinkers and moderate drinkers (p<.01). This study also indicates that there may be a rise in heavy drinking and/or binge drinking among drinkers including underage students. The results of this study suggest that alcohol-blood pressure associations are considered to be of concern even in young adults. This study also suggests the need for special alcohol prevention programs or campaigns to intervene in the behavior of students.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.36 no.3
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• pp.301-307
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• 2012

The characteristics of pressure loss in an asymmetric bifurcating tube were investigated numerically for steady inspiratory conditions. The loss coefficient K calculated for various asymmetry and flow-distribution ratios found in human lung airways showed a power-law dependence on the Reynolds number (Re) and length-to-diameter ratio (L/d), with different exponents for Re $\geq$ 100 and Re < 100. The fundamental characteristics of the asymmetric bifurcation are similar to the case of symmetric bifurcation. In addition, the effect of skewed inlet velocity profiles on the pressure loss was weak, and decreased with an increasing number of bifurcations.

• Nutrition Research and Practice
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• v.9 no.2
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• pp.199-206
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• 2015

BACKGROUND/OBJECTIVE: Even though the prevalence of metabolic syndrome in adolescents is increasing, little is presently known about this syndrome in adolescents. This study aimed to cluster metabolic risk factors as well as examine the associations between identified patterns and nutrient intake using data from the Korean National Health Examination and Nutritional Assessment (KNHANES). SUBJECTS/METHODS: A total of 2,958 subjects aged 10 to 18 years along with both biochemical and dietary data information were obtained from KNHANES 2007-2010. Six components of metabolic syndrome were used to identify any patterns via factor analysis. Individuals were categorized into quartile groups according to their pattern score. RESULTS: Three clustering patterns with high loadings were identified and named as follows: 1) high blood pressure, 2) dyslipidemia, and 3) glucose abnormality patterns. The high blood pressure pattern showed high loadings of systolic and diastolic blood pressures, the dyslipidemia pattern showed high loadings of triglyceride and HDL-cholesterol levels, and the glucose abnormality pattern showed high loadings of fasting blood glucose levels. Intakes of fat and riboflavin were significantly decreased, whereas those of sodium and niacin were significantly increased across the quartiles in the dyslipidemia pattern. No nutrient intake except that of thiamin was significantly associated with the high blood pressure or glucose abnormality pattern. CONCLUSION: Our findings show that metabolic syndrome risk factors in the Korean adolescent population are characterized by three distinct patterns, which are differentially associated with dietary factors. Characterizing metabolic risk factors and providing specific dietary guidelines for target groups are important.

• Korean Journal of Human Ecology
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• v.24 no.1
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• pp.97-109
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• 2015

Recently, because the market for compression wear now includes all consumers, not just professionals, various items for recovery after exercising or for enhanced effects from exercise have been introduced. In this research, a systematic and stepwise design process was proposed to develop compression garment that has both functional area and appropriate pressure to protect the knee when exercising. The U-V format functional area that wraps underneath the knee was selected by considering the shape and change in the skin length when bending the knee. After the selection of the functional area, a total of seven knee design areas, including the existing product, were designed to determine the appropriate pressure. After various movements, the compression garment was ranked in terms of support of the knee, level of pressure, discomfort of seam line, and comfort of popliteal; the preferred design was selected using the quad method. Four compression wear garments were produced using two selected preferred designs; the wear evaluation was performed using a seven-point Likert scale. As a result, the optimal reduction rate of the pattern was calculated based on Ziegert and Keil's method. The applied percentage of the fabric stretch at the upper part of the crotch was 66% for the width and 50% for the length; for the lower part of the crotch, only 66% for the width was applied. Moreover, it was determined that the design of the U-V knee protection part was preferred when a 7 mm square was placed at a 1 mm distance because this not only supports the knee but also allows the fabric to accommodate various skin deformations.

• Korean Journal of Applied Biomechanics
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• v.26 no.1
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• pp.101-113
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• 2016

Objective: The purpose of this study was to investigate the effect of leg length discrepancy (LLD) on the human body during gait and standing posture. Methods: The study group comprised of 17 adult participants with LLDs of <1 cm. LLDs were artificially induced to 0, 1, 2, and 3 cm. The proportion of weight distribution, shift of the mean center of pressure, and Cobb's angle were measured in the standing position. Kinematic variables such as walking and striding width and time, and the proportion of stance phase for single- and double-limb gait were measured as well. The participants were required to either stand or walk on a treadmill (Zebris FDM) with a pressure plate, and the Cobb's angle measurements were obtained from radiographs. Results: A discrepancy of 3 cm in leg length resulted in a statistically significant shift of the center of pressure in the standing position. Moreover, the Cobb angle increased as the discrepancy became larger. The step length and width of the longer (left) leg during gait statistically significantly increased when the discrepancy was 2 cm. In addition, step time was statistically significant when the discrepancy between the longer (right) and shorter (left) legs was more than 2 cm. The proportion of single-limb stance phase was statistically significant as the discrepancy became larger, especially when the discrepancy was >2 cm for the longer (right) leg and 1 cm for the shorter (right) leg. Conclusion: The study showed that LLD influenced deformations of the human body and walking.

• Korean Journal of Human Ecology
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• v.21 no.3
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• pp.551-565
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• 2012

The primary goal of this study was to provide a systematic methodology of utilizing 3D technology for tight-fit performance sportswear using information of skin deformation in various posture. Technical tools used in this study are Cyberware whole body scanner, RapidForm2004, 2C-AN 3D pattern development program, and YukaCAD. Analysis of the 3D skin deformation while knee joint was bent from $0^{\circ}$ to $60^{\circ}$ revealed that the length of dermatomes L4 was remained consistent during knee bending. Therefore, L4 was chosen as a major cutting line. To develop a highly ergonomic pattern, replicas of static and dynamic postures were developed and integrated using two methods, one is morphing method (Sqirlz Morph), and the other is AutoCAD. Experimental tight-fit garments called 'Derm-Mov Pattern' was designed using dematomes L4, L2, and inner line under knee and compared with four other patterns. As results, AutoCAD was appropriate as a integrating method of various postures. In wear test, 'Derm-Mov Pattern' was rated high (p < .001), in terms of pressure comfort especially around front crotch area. However, wear sensation was not signipicantly different in other area due to highly extensible property of materials. Pressure distribution was relatively even in these experimental garments.

• Journal of Biomedical Engineering Research
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• v.19 no.6
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• pp.603-609
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• 1998

To anlyze the diffuse axonal injury of the human brain, 3-D finite element models of the adult, two and three years child were developed. Triangular type acceleration which had its maximum value 200g was applied to investigate the effects of acceleration direction and duration time. The pattern of high shear stress generated at the brain stem, pones and midbrain was similar to the pattern of DAI seen in the clinical observation, especially high maximum shear stress was detected in the brain stem of the six year old child model under flexional acceleration. As the duration of acceleration increased generated pressure and maximum shear stress also increased. For the children's model relatively small pressure was generated regardless of the acceleration direction and continued much longer compared with adult's model. From this analysis maximum shear stress was revealed more proper indicator to predict DAI compared to HIC in case of angular acceleration loading.