• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.56 no.3
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• pp.238-245
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• 2020

In this study, a motion control problem for the vessel towed by towing ship on the sea is considered. The towed vessel does not have self-control capabilities such that its course stability totally depends on the towing ship. Especially, in the narrow canal, river and congested harbor area, extreme tension is required during the towing operation. The authors, therefore, propose a new control system design method in which the rudder is activated to provide its maneuverability. Based on the leader following system configuration, a nonlinear mathematical model is derived and a backstepping control is designed. By experiment results with nonlinear control framework, the usefulness and effectiveness of the proposed strategy are presented.

• Journal of the Korea Convergence Society
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• v.6 no.6
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• pp.35-42
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• 2015

This study was done to explore clinical competence and factors related to competence in dental hygiene students. This study performed a survey on such an issue from March 2 to June 12, 2015 for 329 dental hygiene students who were residing in Busan and Ulsan. In the result by the satisfaction of the major, there is the highest score in the satisfaction of the critical thinking, self-leadership, satisfaction in clinical practice and ability of clinical performance. The critical thinking reveals the positive relationship with the self-leader ship(r=0.884) and the ability of clinical performance(r=0.845). Whereas the self-leader ship show the negative relation with stress in clinical practice(r=-0.796). The most important factor affecting on the clinical competence among dental hygiene students was critical thinking(p<0.001), followed by self-leadership(p<0.01) and satisfaction of clinical practice(p<0.01). In results, the critical thinking, the self-leader ship and the satisfaction of clinical practice have an effects on the ability of clinical performance of the dental hygiene students. The teaching learning strategy and the educational programs to enhance the critical thinking and self-leader ship should be developed. Furthermore, the present study can be used as the base data for the systematic and convergence program to improve the satisfaction of clinical practice and the ability of clinical performance.

• Journal of Korean society of Dental Hygiene
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• v.18 no.2
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• pp.165-175
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• 2018

Objectives: This study aims to examine the factors that influence the organizational citizenship behavior of clinical dental hygienists to use them as basic data for improving effectiveness and efficiency of dental clinics and hospitals. Methods: A self-reported questionnaire was answered by 250 clinical dental hygienists in Seoul, Gyeonggi, Chungcheong, Jeolla and Gyeongsang province areas who were chosen using convenient sampling method from May 1st to June 30th of 2017. The data was analyzed using IBM SPSS/WIN 22.0 factor analysis on clinical dental hygienists' organization citizenship behavior, organizational commitment, empowerment, self-leadership and job satisfaction. T-test and one-way ANOVA were performed for subjects' general characteristics and organizational citizenship behavior, organizational commitment, empowerment, self-leadership and job satisfaction depending on their job characteristics. The mean comparison was drawn using the Scheffe test. Pearson's correlation and multiple regression analysis were performed to examine the relation of clinical dental hygienists' organizational citizenship behavior, organizational commitment, empowerment, self-leadership and job satisfaction Also, the significance level was set at 0.05. Results: Clinical dental hygienists' organizational citizenship behavior was 3.84 points with organizational commitment of 3.27, empowerment of 3.41, self-leadership 3.45 and job satisfaction of 3.57. Factors that influence clinical dental hygienists' organizational citizenship behavior appeared in the order of organizational commitment, job satisfaction, self-leadership, empowerment and job intensity, and the model's explanation power was 45.6%. Conclusions: Clinical dental hygienists' organizational citizenship behavior was correlated to career, organizational commitment, empowerment, self-leadership and job satisfaction, where organizational commitment had the biggest influence. Therefore, clinical dental hygienists organizational citizenship behavior needs further studies and investigtae more ways to promote factors that influence organizational citizenship behavior.