• Korean Journal of Adult Nursing
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• v.27 no.6
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• pp.634-643
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• 2015

Purpose: The purpose of the study was to investigate the factors affecting on smartphone addiction according to the classification of addiction-risk groups among college students, focusing on self-control. Methods: A sample of 242 college students at K University in Seoul was recruited to participate in the study. A structured questionnaire composed of items for the self-rated smartphone addiction scale and self-control scale was used to collect data. Results: The number of students in smartphone addiction-risk group was 66 (27.3%). This study had 17.5% of the explanatory power, including perceived smartphone necessity (${\beta}=.330$, p=.007), and instant self-control (${\beta}=-.281$, p=.028) in addiction-risk group. Whereas, in non-risk group, the affecting factors included gender (${\beta}=.194$, p=.004), self-awareness of addiction (${\beta}=-.290$, p<.001), and instant self-control (${\beta}=-.281$, p<.001) with 31.3% of the explanatory power. Conclusion: There is a need to develop an intervention program to prevent the addiction of smartphones and to improve self-control among college students.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.19 no.1
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• pp.33-39
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• 2013

Background: The purpose of this study was to find out the effect of trunk stabilization training on the self posture control efficacy, physical self-description and perception stress in high school students. Methods: 92 voluntary students (73 females, 19 males) participated in this study. They received trunk stabilization training for 40 minutes per day and a time per week during 6 weeks period. Trunk stabilization training was an approach of education in proper posture and coordination of movement. In the evaluation, the self posture control efficacy scale (SPCES) was used to measure the posture control efficacy, the physical self-description questionnaire (PSDQ) was used to measure the physical self description and the perception stress scale (PSS) was used to measure the stress. All measurement of each subject were measured before and after stabilization training. Results: The SPCES were significantly different before and after (p<.05). The PSDQ and PSS were no significantly different before and after (p>.05) but the means were increased slightly. Conclusion: Conclusionally these results suggest that the trunk stabilization training increased the self posture control efficacy and would give help to control Students themselves.

• Journal of Families and Better Life
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• v.28 no.6
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• pp.47-57
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• 2010

This study examines the effects of parental variable(parental support and supervision), temperament(activity level, attention span/persistence, and emotionality) and the internal locus of control on self-regulation of children. Data were collected from 455 5th and 6th graders and analyzed with Pearson's correlations and pathway analysis. The results were as follows : Children's temperament, internal locus of control and parental variable directly affected children's self-regulation. Parental variables mediated between children's temperament and internal locus of control and self-regulation. Internal locus of control mediated between children's temperament and self-regulation: in addition, the most important variable predicting children's self-regulation was children's attention span/persistence temperament.

• The Korean Journal of Food And Nutrition
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• v.25 no.3
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• pp.483-489
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• 2012

In this study, a survey was carried out on 208 students at middle schools in Gyeonggi-do through May 1 to July 20, 2011, with the purpose of figuring out how eating attitudes of middle school students affect their psychological achievement and self control. The results were as follows. First, the effect of eating attitudes on the psychological achievement of middle school students demonstrated that regular dietary life, dietary life and health had a statistically significant positive effect on psychological achievement. Second, the effect of eating attitudes on self control in middle school students showed that balanced dietary life, dietary life and health had a statistically significant positive effect on self control. The above findings confirmed that regular and healthy dietary life connected directly with health, which was a factor that makes them think positively about psychological achievement. Besides, for eating self control, as balanced dietary life in eating attitudes was important. And as this had a positive effect on their self control, could improve their eating attitudes. Consequently, the regular eating attitudes and balanced dietary life in eating attitudes of middle school students can make their psychological achievement and eating self control for the nutrition and health care.

• Journal of Korean Academy of Fundamentals of Nursing
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• v.18 no.2
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• pp.217-225
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• 2011

Purpose: The purpose of this study was to analyzing the relationship between perceived health status, health locus of control, self-esteem, self-efficacy and HPB in patients with multiple myeloma to identify factors influencing health promoting behavior (HPB). Methods: One hundred patients were recruited into the study. The data were collected by personal interviews using questionnaires. Descriptive statistics, Pearson's correlation coefficients and stepwise multiple regression analysis were used with SPSS program to were analyze the data. Results: There were significant relationships between self-esteem (r=.787, p<.001), self-efficacy (r=.681, p<.001), internal health locus of control (r=.557, p<.001), powerful others health locus of control (r=.517, p<.001), chance health locus of control (r=-.251, p=.012), perceived health status (r=.532, p<.001) and HPB. Significant factors in explaining HPB were self-esteem, powerful others health locus of control, self-efficacy and perceived health status and together they accounted for 71% of variance. Conclusion: The study findings indicate that self-esteem, powerful others health locus of control, self-efficacy, and perceived health status were important factors in explaining HPB in patients with multiple myeloma. As self-esteem was an important variable in HPB, health promotion program designed for this population should focus on self-esteem and these other factors to enhance effective health promotion behavior.

• The Journal of Korean Academic Society of Nursing Education
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• v.18 no.2
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• pp.197-205
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• 2012

Purpose: This study aimed to demonstrate correlations among self-regulated learning, attention control and Yangseng, to clarify any differences depending on general characteristics and ultimately to understand factors affecting self-regulated learning of undergraduates. Methods: Data were collected for a month from April 1st, 2011. A total of 438 undergraduate nursing students of two universities in Chungbuk and Chungnam were surveyed by using a questionnaire about self-regulated learning, attention control and Yangseng. Results: Self-regulated learning of the subjects showed statistically significant correlations with their attention control (r=.302, p=.001) and Yangseng (r=.292, p=.001). In addition, self-regulated learning could be explained by attention control (${\beta}$=3.648, p=.001), Yangseng (${\beta}$=3.645, p=.001), perceived academic achievement levels (${\beta}$=.124, p=.018), or eating breakfast (${\beta}$=.102, p=.027). In the model, the variables explained self-regulated learning by 19.0%. Conclusion: Nursing instructors should encourage undergraduate nursing students to enhance their attention control so that they can improve their self-regulated learning abilities, which will eventually develop their problem solving skills. In addition, it was shown that self-regulated learning correlates with yangseng including eating a regular breakfast. Maintaining a desirable lifestyle is also essential for students to succeed in self-regulated learning.

• Journal of Families and Better Life
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• v.35 no.2
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• pp.17-29
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• 2017

The purposes of this study were to analyze the effect of perceived parent-adolescent communication on SNS addiction tendency among high school students and to investigate the mediating effects of self-control on the relationship between above variables. 567 students who were registered in three high schools located in D city completed a questionnaire on parent-adolescent communication, SNS addiction tendency, and self-control. Structural equation models were conducted to compare the research model (complete mediating effect) and the competing model (partial mediating effect), and bootstrapping was conducted to investigate the mediating effects of self-control with SPSS 23.0 and AMOS 23.0. The results are as follow: First, while the parent-adolescent communication did not directly have an effect the SNS addiction tendency, the self-control had a direct effect on the SNS addiction tendency. Second, the research model was selected as a final model which implied that parent-adolescent communication had an indirect effect on SNS addiction tendency among high school students. Third, self-control had a significant mediating effect on the relationship between parent-adolescent communication and high school students' SNS addiction tendency. Based on the results of this study, it can be concluded that parent-adolescent communication had an indirect effect rather than a direct effect through self-control on high school students' SNS addiction tendency. This result indicates that the SNS addiction tendency rate of high school student can be lowered, by mediating self-control. Finally, this study suggests that the implicit points on counseling methods to remedy self-control of high school students, and shortcomings and limits of this study and advice for follow-up studies all be discussed.

• Journal of Korean society of Dental Hygiene
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• v.16 no.2
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• pp.269-275
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• 2016

Objectives: The purpose of the study is to investigate the influence of self-control on stress management and oral health related quality of life in high school students. Methods: A self-reported questionnaire was completed by 422 high school students in Ulsan from December 1, 2014 to February 20, 2015. The study instrument consisted of stress and self-control. The stress instrument included 17 items modified by Kim and Lee. The self-control instrument was modified by Kim and had 20 items. Pearson's correlation analysis was conducted to analyze the relationship between stress, self-control and oral health related quality of life. Regression analysis was used to analyze the effect of the stress on oral heal related quality of life. Hierarchical regression analysis was done to analyze the control effect of self-control in the relationship between the stress and oral health related quality of life. Results: The higher stress level resulted in the lower oral heal related quality of life. The higher self-control maintained the higher oral health related quality of life. The higher long term pursuit of satisfaction led to higher oral health related quality of life. The immediate suppression of satisfaction had a positive influence on the higher oral health related quality of life. Conclusions: There were significant correlations in self-control on stress management and oral health related quality of life.

• Journal of Institute of Control, Robotics and Systems
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• v.4 no.1
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• pp.68-75
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• 1998

The Intelligent Cruise Control system, ICC, is a driver assisting system for controlling relative speed and distance between two vehicles in the same lane. The ICC may be considered as an extension of a traditional cruise control, not only keeping a fixed speed of the vehicle, but correcting the speed also to that of a slower one ahead. This paper presents a real-time self-tuning fuzzy control algorithm to develop ICC. The self-tuning fuzzy control law is adopted to reduce the effects of nonlinearities of the vehicle and various road environments. In the self-tuning algorithm an interior penalty method is applied to preserve the inherent order of membership functions and is modified as an on-line algorithm for real time application. Via simulations, the performance of the suggested control algorithm is compared with a PID and a fuzzy control without self-tuning. The suggested control algorithm is implemented on PRV III and the results of the test driving on a local road are given.

• Journal of the Korean Society for Precision Engineering
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• v.13 no.5
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• pp.139-147
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• 1996

PID control has been widely used for real control systems. Particularly, there are many researches on control schemes of tuning PID gains. However, to the best of our knowledge, there is no result for discrete-time systems with unknown time-delay and unknown system parameters. On the other hand, Generalized predictive control has been reported as a useful self-tuning control technique for systems with unknown time-delay. So, in this study, based on minimization of a GPC criterion, we present a self-tuning PID control algorithm for unknown papameters and unknown time-delay system. A numerical simulation was presented to illustrate the effectiveness of this method.