• Journal of the Korean Society of School Health
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• v.7 no.2
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• pp.135-143
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• 1994

This study is aimed at providing basic information necessary to set up education program and strategies to prevent high school students from smoking by school health care service. The main groups of study are 814 third-grade male students, 557 parents and 362 teachers, who were randomly chosen at 8 high schools in Seoul. Date analysis consisted of Chi-square test and percentage. The findings of the study are as follows: 1. The less interesting family life is, the more increasing current smoking rate is, (ex-smoking rate 53.5%, re-smoking rate 40.3%, current smoking rate 24.3%) 2. According th the results of $x^2$-test for the school life and the smoking, the students above ranking 41 showed th increase as 48.7% for continuous smoking, 18.9% for re-smoking, 67.6% for the present smoker. But it turned out that the students belonged to ranking 10 were not experienced the smoking. So it showed that there was a correlation between score and smoking. 3. It is noted that 93.3% of students, 93.3% of parents and 96.1% of teachers recognize harmful effect of smoking. But less than 70% those have recognized only half of all smoking knowledge. 4. There is a significant difference in the contends and types of education between parents and teachers. 5. For the time of home education and school health education to prevent the smoking, it turned out that 44.9% of students, 42.4% of parents, and 47.4% of teachers considered the optimal time as a high school' days. In addition it appeared that 40.5% of students, 33.4% of parents, and 54.6% of teachers recognized the necessity of the early education before the elementart school. For the optimal time to begin school health education, it showed that the middle school days were indicated from 56.6% of students, 52.7% of parents, the elementary school days were 54.6% of parents, the elementary school days were 54.6% of teachers.

• Journal of the Korea Institute of Military Science and Technology
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• v.18 no.3
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• pp.267-274
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• 2015

It is necessary to both analyze root-cause of non-conformance of effective illumination time to the specification, and estimate the storage lifetime for 81 mm illuminating projectile stockpiled over 10 years. In this paper, aging mechanism of magnesium flare material due to long-term storage was supposed, and two-stage tests, pre-test and main test based on accelerated degradation tests were performed. Field storage environment of moistureproof was set up, and illumination times in the accelerated degradation tests for temperatures 60 and $70^{\circ}C$ were measured. Then, storage reliability of the projectile was estimated through analyzing the measured data and applying distribution-based degradation models to the data. The $B_{10}$ life by which 10 % of a population of the projectiles will have failed at storage temperature of $25^{\circ}C$ was estimated about 7 years.

• Journal of Korean Academy of Nursing
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• v.48 no.1
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• pp.26-37
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• 2018

Purpose: The aim of this study was to evaluate the effects of active mandibular exercise (AME) in patients with limited mouth opening after maxillomandibular fixation (MMF) release. Methods: The study used a quasi-experimental, nonequivalent control group and a pre test-post test design. Sixty-two patients with Maxillomandibular Fixation Release were assigned to the experimental (n=31) or control group (n=31). The AME was performed in the experimental group for 4 weeks. The exercise AME consisted of maximal mouth opening, lateral excursion and protrusive movement. These movements were repeated ten times a day. After the final exercise of the day, the number of tongue blades used for mouth opening was noted. The effect of AME was evaluated after MMF release at different time intervals: a) immediately, b) after 1 week, c) after 2 weeks, d) after 4 weeks, and e) after 12 weeks. The exercise was assessed using the following criteria: a) mandibular movements, b) pain scores associated with maximal mouth opening, c) discomfort scores associated with range of movement, and d) daily life activities that involve opening the mouth. Results: The experimental group showed significant improvement regarding the range of mandibular movements (maximal mouth opening (F=23.60, p<.001), lateral excursion to the right side (F=5.25, p=.002), lateral excursion to the left side (F=5.97, p=.001), protrusive movement (F=5.51, p=.001)), pain score (F=39.59, p<.001), discomfort score (F=9.38, p<.001). Daily life activities that involve opening the mouth were more favorable compared to those in the control group. Conclusion: The AME in patients after MMF release is helpful for increasing mandibular movement range, decreasing pain and discomfort, and improving day life activities that involve opening the mouth. Therefore, AME is highly recommended as an effective nursing intervention.

• Human Ecology Research
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• v.56 no.1
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• pp.33-54
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• 2018

This study devised an instruction that applies the content factors of Family Life Planning to backward design by exploring the fundamental concepts of backward design and the structure of developing a systematic instruction. Furthermore, it was conducted to improve the developed instruction by examining its validity with the help of experts and to find the method of applying it to the curriculum. The lesson design of this study was as follows. 1) Making a unit outline, 2) Identifying the expected results (Shaping the objectives), 3) Deciding acceptable evidence (Planning evaluation), 4) Making a detailed blueprint for class tasks, 5) Planning learning experience, 6) Making a learning experience plan per time, 7) Checking the lesson design. Second, experts participated in this study for the internal validity test about the process of the systematic lesson development of Family Life Design based on a backward design. The results were shown to be valid because the average was 3.7 out of a perfect score 4 and the CVI of all was over 0.9. The result of the IRA was also score 1, meaning that most of the experts agreed on the results of the test. The details of the lesson design were clear at every stage and the tasks and the results of each stage were specific. This study included most of the necessary stages for a backward design.

• Journal of the Korean Society of Propulsion Engineers
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• v.23 no.2
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• pp.111-117
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• 2019

An experimental study on the welding part of a heat transfer plate that constitutes the lightweight and high efficiency recuperator is presented in this paper. In particular, to find out the service life of the welded part, fatigue characteristics were determined through experiments. Experiments were carried out on two materials (STS347, AL20-25 + nb), which are selected as the material of the recuperator; further, the specimens were manufactured through the methods used for actual fabrication and the standards recommended by ASTM. To evaluate the mechanical properties of the specimens at room and high temperature, MTS-810 was used in a high-temperature furnace. The tensile test was carried out at room and high temperatures for each specimen. The fatigue test was carried out by setting the load ratio corresponding to 50%, 40%, 30%, 20%, and 10% of the tensile strength at the stress ratio of 0.1. Finally, the fatigue life characteristics obtained by the experiment were compared with the stresses owing to the load generated in the operating conditions of the recuperator, and the lifetime of the welds was evaluated to prepare for the operation time required by the UAV.

• Journal of Industrial Technology
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• v.43 no.1
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• pp.7-13
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• 2023

Nowadays, traffic congestion is emerging as a major problem due to the rapid population growth and the increase in automobiles. The train is a convenient means of transportation that can efficiently solve these problems. Trains have been developed in line with human aspirations for a long time, but research on safety is still insufficient. This study aims to check safety by conducting static tests and fatigue tests on bogie frames, and to help develop bogie frames in the future. For the static test, a strain gauge was attached to the point where the local stress concentration was expected beforehand, and the result value was derived, compared with existing theories, and expressed as a Goodman diagram. In the fatigue test, a total of 10 million loads were applied over three stages, and no cracks appeared in the non-destructive test conducted after each stage. Both tests were conducted according to the strict test method of the bogie frame presented by the UIC Code. It satisfied both fatigue life and strength evaluation criteria and was judged to be a bogie frame usable for safe train production.

• Journal of Korean Physical Therapy Science
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• v.8 no.1
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• pp.759-770
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• 2001

The purpose of this study is through a analysis between old diagnostic tests of the Internet Addiction Syndrome to make a new test model for the physical disturbance problems for the addiction persons. Suggestion treatment for the Internet Addiction Syndrome are follows: 1. Try to decide in advance how much time you will spend on the Net time a day. 2. Decide how much you want the Internet to be a part of each area of your life and then allocate time accordingly. 3. You may decide that you want to keep the Internet at work, and shut the door on it when you leave for home. 4. To physical exercise regularly. 5. Take frequent breaks. 6. Seek out friends and acquaintances who couldn't care less about the Internet. 7. Interact with people in a non-wired world. 8. Consult a Dr. if you can't solved.

• International Journal of Advanced Culture Technology
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• v.10 no.1
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• pp.17-23
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• 2022

The purpose of this study is to develop a cancer rehabilitation program for cancer survivors in the form of a smartphone application and to confirm the effectiveness through Pilot study. The contents of the application consisted of health records, lab-test records, and health information, and the information recorded by the patient was graphically checked for changes over time on my page. 7 subjects who ended acute treatment and were undergoing follow-up were asked to use the application for 4 weeks, and then changes in variables (uncertainty, e-health literacy, self-efficacy, and cancer rehabilitation) were confirmed. It was confirmed that e-health literacy and self-efficiency increased significantly over time after using the application. In addition, the level of cancer rehabilitation was found to increase significantly over time. The application for cancer rehabilitation developed in this study needs to be expanded to improve the quality of life of cancer survivors.

• Journal of the Korean Wood Science and Technology
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• v.48 no.3
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• pp.364-375
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• 2020

In this study, ultrasound-assisted extraction was performed to extract ascorbic acid from rugosa rose (Rosa rugosa Thunb.) fruit. The optimal conditions were investigated by response surface methodology, using two variable including reaction time (16-44 min) and temperature (16-44℃). The ascorbic acid extraction was sensitive to the reaction time rather than the reaction temperature, and the optimal conditions for ascorbic acid extraction were 25℃ and 30 min. Ascorbic acid and gallic acid in the rugosa rose fruit extract were completely separated by HPLC, with a resolution factor of over 1.5 between the two. The correlation coefficient of the ascorbic acid was 0.999 in a linearity test for 50-150 ㎍/mL concentration of extract. The limit of detection and limit of quantification values were 0.16 ㎍/mL and 29.89 ㎍/mL, respectively. The relative standard deviations (RSD) for repeatability and reproducibility were determined, and each RSD showed good precision at less than 5% (N=6).

• Anxiety and mood
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• v.12 no.1
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• pp.21-27
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• 2016

Objective : The aim of this study was to investigate the relationship between subjective sleep problems and various types of traumatic events of patients with depressive disorder. Methods : A total of 411 patients diagnosed with depressive disorders were recruited in this study. The participants filled out Life Time Events Checklist (LEC), Pittsburgh Sleep Quality Index (PSQI), Beck Depression Inventory (BDI), and State-Trait Anxiety Inventory (STAI). We used the independent t-test and analysis of covariance to compare each component of PSQI between depressive patients with and without traumatic experiences. Results : The groups of patients who experienced a serious accident at work, home or during recreational activity, sexual assault, other unwanted or uncomfortable sexual experience, life-threatening illness or injury, and sudden, unexpected death of a near and dear one showed lower scores in a few components of PSQI. Sleep disturbance was a common problem in all five groups. Lower subjective sleep quality and longer sleep latency was observed in three groups. There were no differences in the other components of PSQI among groups. Conclusion : This study showed that various types of traumatic events may have different effects on subjective sleep quality as a consequence of the traumatic event which they had experienced.