• 기본간호학회지
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• 제11권3호
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• pp.335-343
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• 2004

Purpose: This study was to evaluate effect of an educational program based upon experiment for smoking prevention in middle school students. Method: A quasi-experimental design was used. The participants were 107 middle school students (53 in the experimental group, 54 in the control group). Students in the experimental group participated in three 45-minute educational programs over a period of 2 weeks. The dependent variables were measured before and 2 & 4 weeks after the treatment. The data were analyzed using $x^2$ test, Fisher's exact test, t-test, and repeated measures ANOVA. SPSS was used to aid analysis. Results: 1) The experimental group showed higher levels of knowledge of smoking prevention compared to the control group. However this program did not affect their attitude towards smoking. 2) There was a higher possibility of smoking in the future among the students who had smoked than those who had not. 3) The majority (84.9%) of the experimental group said that the program was effective. Conclusion: Knowledge of smoking for the experimental group was increased, so it is assumed that the program itself had a positive effect on the students. To change attitudes regarding smoking, smoking prevention programs need to be conducted repeatedly, not just temporarily.

• 국제물리치료학회지
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• 제10권4호
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• pp.1873-1878
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• 2019

Background: Walking is a complex activity. The main components of walking include balance, coordination, and symmetrical posture. The characteristics of walking patterns of stroke patients include slow walking, measured by gait cycle and walking speed. This is an important factor that reflects post-stroke quality of life and walking ability. Objective: This study aimed to examine the effect of deep lumbar muscle stabilization exercise on the spatiotemporal walking ability of stroke patients. Design: Quasi-experial study Methods: The experiment was conducted 5 times per week for 4 weeks, with 30 minutes per session, on 10 subjects in the experimental group who performed the deep lumbar muscle stabilization exercise and 10 subjects in the control group who performed a regular exercise. Variables that represent the spatiotemporal walking ability (step length, stride length, step rate, and walking speed) were measured using GAITRrite before and after the experiment and were analyzed. Results: There was a significant difference in the pre- and post-exercise spatiotemporal walking ability between the two groups (p<.05). Furthermore, there was a significant difference in the step rate and walking speed between the two groups (p<.05). Conclusions: Deep lumbar muscle stabilization exercise is effective in improving the walking ability of stroke patients. Therefore, its application will help improve the spatiotemporal walking ability of stroke patients.

• 대한간호학회지
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• 제39권5호
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• pp.662-672
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• 2009

Purpose: This study was to examine the effects of self-foot reflexology on stress, fatigue and blood circulation in premenopausal middle-aged women. Methods: A quasi-experimental nonequivalent control group, pretest-posttest design was used. Participants were 59 premenopausal, middle-aged women in their 40s and 60s living in G city: 30 in the experiment group and 29 in the control group. Data were collected from May to August 2008. Self-foot reflexology was performed three times a week for 6 weeks for 40 min at each session. Results: The results showed that self-foot reflexology was effective in reducing perceived stress and fatigue and helped blood circulation in premenopausal middle-aged women. Conclusion: Self-foot reflexology may be an effective nursing intervention in reducing perceived stress and fatigue and in improving blood circulation.

• Journal of Power Electronics
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• 제13권4호
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• pp.729-736
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• 2013

Knowledge of a power semiconductor's operating temperature is important in circuit design and converter control. Designing appropriate circuitry that does not affect regular circuit operation during virtual junction temperature measurement at actual operating conditions is a demanding task for engineers. The proposed method enables virtual junction temperature estimation with a dedicated modified gate driver circuit based on real-time measurement of a semiconductor's quasi-threshold voltage. A simulation was conducted before the circuit was designed to verify the concept and to determine the basic properties and potential drawbacks of the proposed method.

• 한국간호교육학회지
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• 제12권2호
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• pp.187-195
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• 2006

Purpose: The purpose of this study is a) to develop a self-awareness program using various action methods and b) to experiment the effects of that on self-concept, the self-perception and the self-esteem in nursing students. Method: The subjects of this study were 37 nursing students. Using one-group pretest-posttest quasi-experimental research design, we conducted the experiments of a self-awareness program during the period of six weeks from March through May of 2004. Results: The scores of the posttest on self-concept, self-perception and self-esteem in nursing students were significantly higher than those scores of the pro-test. Conclusion: The results of our experimentation showed that a self-awareness program using various action methods was very effective to enhance self-concept, self-perception and self-esteem in nursing students. In particular, different action methods of psychodrama were shown to be a useful tool in exploring the areas of blind self and unknown self.

• Steel and Composite Structures
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• 제47권3호
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• pp.383-393
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• 2023

Conventional reinforced concrete design codes assume ideal strain evolution in semi-deep beams with externally bonded fiber-reinforced polymer (EB-FRP) web strips. However, there is a strain interaction between internal stirrups and web strips, leading to a notable difference between code-based and experimental shear strengths. Current study provides an experiment-verified detailed numerical framework to assess the potential strain interaction under quasi-static monotonic load. Based on the observations, steel stirrups are effective only for low EB-FRP amounts and the over-strengthening of semi-deep beams prevents the stirrups from yielding, reducing its shear strength contribution. A notable difference is detected between the code-based and the study-based EB-FRP strain values, which is a function of the normalized FRP stress parameter. Semi-analytical relations are proposed to estimate the effective strain and stress of the components considering the potential strain interaction. For the sake of simplification, a linearized correction factor is proposed for the EB-FRP web strip strain, assuming its restraining effect as constant for all steel stirrup amounts.

• Design & Manufacturing
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• 제15권2호
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• pp.23-29
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• 2021

The specific strength of magnesium alloy is four times that of iron and 1.5 times that of aluminum. For this reason, its use is increasing in the transportation industry which is promoting weight reduction. At room temperature, magnesium alloy has low formability due to Hexagonal closed packed (HCP) structure with relatively little slip plane. However, as the molding temperature increases, the formability of the magnesium alloy is greatly improved due to the activation of other additional slip systems, and the flow stress and elongation vary greatly depending on the temperature. In addition, magnesium alloys exhibit asymmetrical behavior, which is different from tensile and compression behavior. In this study, a jig was developed that can measure the plane deformation behavior on the surface of a material in tensile and compression tests of magnesium alloys in warm temperature. A jig was designed to prevent buckling occurring in the compression test by applying a certain pressure to apply it to the tensile and compression tests. And the tensile and compressive behavior of magnesium at each temperature was investigated with the developed jig and DIC equipment. In each experiment, the strain rate condition was set to a quasi-static strain rate of 0.01/s. The transformation temperature is room temperature, 100℃. 150℃, 200℃, 250℃. As a result of the experiment, the flow stress tended to decrease as the temperature increased. The maximum stress decreased by 60% at 250 degrees compared to room temperature. Particularly, work softening occurred above 150 degrees, which is the recrystallization temperature of the magnesium alloy. The elongation also tended to increase as the deformation temperature increased and increased by 60% at 250 degrees compared to room temperature. In the compression experiment, it was confirmed that the maximum stress decreased as the temperature increased.

• 재활간호학회지
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• 제18권1호
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• pp.38-45
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• 2015

Purpose: This study was attempted in order to verify the effects of moxibustion on aged back pain and activities of daily living. Methods: A research design is quasi-experiment with pre-post test design in nonequivalent control group. As for data collection and experimental treatment, it accidentally sampled totally 50 people with 24 people for the experimental group and 26 people for the control group who appeal for chronic back pain aged over 60 who visited 4 senior centers where are located in N city from November 7, 2012 to December 3, 2012. Experimental treatment was carried out moxibustion totally 12 times by 3 times for 4 weeks in the experimental group. Data analysis was made by using SPSS program. As an analytical technique, the experimental group and the control group were analyzed the homogeneity verification with t-test, Fisher's exact test and $x^2$ test and the hypothesis verification with t-test. Results: The back pain level was reduced in the experimental group than the control group. The disability of daily living activities was reduced in the experimental group than in the control group. Conclusion: Moxibustion was considered to be likely useful therapeutic method for effects of chronic back pain and disability of daily living activities in aged.

• Child Health Nursing Research
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• 제13권3호
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• pp.282-290
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• 2007

Purpose: The purpose of this study was to examine the effects of EP-IGAP(Internet Game Addiction Prevention Educational Program) on increasing the self-control and decreasing the time spent on internet games. Method: The research design was a quasi-experiment, repeated measures design with non-equivalent control group. Participants in this study were 269 elementary school students of elementary school(134 for the experimental group, 135 for the control group). The instruments used in this study were the Self-control of Internet Game Scale and Time spent on internet games per week. The experimental group participated in the EP-IGAP for 6 weeks. Results: After the intervention, the experimental group showed a significant increase in self-control related to internet games. But, there was no statistical difference in the time spent on internet games between the two groups. Conclusion: These results suggest that EP-IGAP is effective in increasing the self-control related to internet games in elementary school students. Further research is needed to modify the EP-IGAP.

• 한국직업건강간호학회지
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• 제20권2호
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• pp.105-112
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• 2011

Purpose: The purpose of this study was to investigate the effect of foot bath therapy on post-operation pain, stress, HRV of hand replantation patients. Methods: Quasi-experimental study design and non-equivalent control group pre & post test repeated measure design were employed for this experiment. 47 subjects were selected for this study. 25 subjects of experimental group participated in foot bath program had foot bath 11 times for 2 weeks; 22 subjects of control group didn't have foot bath. Pain was digitized numerically by using Visual Analogue Scale, stress was measured by stress perception questionnaire, and HRV was measured by using Cnopy9 (IEMBIO). Results: The collected data were analyzed by using SPSS 17.0 Win program. (1) The difference between experimental group and control group was shown statistically significant in aspect of pain (p<.05). (2) The difference between experimental group and control group was shown statistically significant in aspect of stress (p<.05). (3) The difference between experimental group and control group was not shown statistically significant in aspect of HRV (p>.05). Conclusion: Foot bath program was an effective intervention for pain loss and perception of stress reduction. But it wasn't effective for HRV.