• 한국임상수의학회지
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• 제20권4호
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• pp.458-466
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• 2003

The bone regeneration effects of copper oxide on experimentally induced fibular fracture were examined in 36 New Zealand white male rabbits. They were divided into two groups: non-treated group (control group) and copper oxide treated group (treatment group). A fibular fracture was created by an osteotomy in the middle of the fibula and 62.5 mg/kg of copper oxide was orally administrated during 7 days after operation in the treatment group. Radiological findings, histopathological examinations and hematoserological findings were observed to evaluate the bone regeneration effects of copper oxide on fibula fracture during 9 weeks. In radiological findings, the area of bone regeneration at the fracture site of the treatment group was significantly wider from 3 weeks to 6 weeks after administration of copper oxide than those of the control group (p < 0.05). In histopathological examinations, fracture healing in treatment group was faster than in control group. Also, histopathological responses of thick bony trabeculae and new bone marrow formation were shown in the treatment group, whereas many fibrous tissues and cartilages were mainly observed in the control group. No specific effects of copper oxide on the body was found in hematological and serological test during experimental period. These results showed that the copper oxide had a potential therapeutic application in the treatment of fracture and bone trauma.

• 한국학교ㆍ지역보건교육학회지
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• 제19권3호
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• pp.29-39
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• 2018

Objectives: The purpose of this study was to identify the effects of college student gambling experience on the gambling problems. Methods: The study included 260 students from four-year universities in Seoul and Gangwon Province, and collected data from March 1, 2018 to March 31, 2018. The data were analyzed with the SPSS 23.0. Results: First, gambling experience showed high frequency among males (68.5%), 21 years of age and older (45.5%), boarding house (66.1%), and two or more siblings (40.5%). Second, the gambling problem based on the experience of gambling was statistically significant in academic problem, interpersonal relationship, and gambling control. Third, the mental health of the subjects was highly correlated by interpersonal relationship, gambling recognition and academic problem. Also, academic problem was highly correlated in order of gambling control and interpersonal relationship. Fourth, effects of gambling experience on the gambling problems were identified as gambling control, interpersonal relationships, gambling awareness and mental health. Conclusion: Recognize the seriousness of the gambling problem of college students in order to solve the gambling problem, the government, communities and universities should actively promote the harmful effects of gambling and provide regular mental health. education at universities.

• 대한가정학회지
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• 제40권8호
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• pp.191-206
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• 2002

The purpose of this study was to explore the effects of adolescent attachment to mothers and peers, self-esteem and impulse control on delinquency. The subjects were 624 eighth and eleventh grade students in Busan. The subjects rated themselves on questionnaires regarding attachment to mothers and peers, self-esteem, impulse control and latent delinquency. The major findings of this study were as follows; 1) Male adolescent delinquency increased with grade. But no grade difference was found in female adolescent delinquency. And male adolescent had more delinquency than female adolescent. 2) Grade had a direct and indirect effect through attachment to peers and impulse control on male adolescent delinquency and was the first positive contribution factor. Impulse control had a direct negative effect on male adolescent delinquency. Attachment to mothers had an indirect negative effect through self-esteem on male adolescent delinquency. Attachment to peers had an indirect negative effect through self-esteem and impulse control on male adolescent delinquency. Self-esteem had an indirect negative effect through impulse control on male adolescent delinquency. 3) Attachment to mothers had a direct and indirect effort through impulse control on female adolescent delinquency and was a first negative contribution factor. Impulse control had a direct negative effect on female adolescent delinquency. Attachment to peers had an indirect negative effect through impulse control on female adolescent delinquency. Grade had an indirect negative effect through impulse control on female adolescent delinquency. Self-esteem had no effect on female adolescent delinquency.

• 아동학회지
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• 제32권5호
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• pp.67-84
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• 2011

This study examined the effects of parental control and children's autonomy on self-esteem, using a sample of 415 school-age children (208 boys and 207 girls) recruited in Seoul. Ordinary Least Square regressions revealed a variety of gender-based differences in the associations among these three variables. Boys with high maternal behavioral control had high levels of self-esteem, whereas girls under low paternal psychological and high behavioral control reported high levels of self-esteem. Boys with high maternal behavioral control and girls with high paternal behavioral control also reported high levels of autonomy. Autonomy was found to exert a positive impact on self-esteem for both boy and girls. Autonomy played a mediating role in the relationships between maternal behavioral control and self-esteem for boys, and between paternal behavioral control and self-esteem for girls. These findings highlight the differential influences of psychological control and behavioral control on autonomy and self-esteem, as well as the relative impact of the opposite sex parent on the development of autonomy and self-esteem in late childhood.

• Nuclear Engineering and Technology
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• 제54권5호
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• pp.1644-1651
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• 2022

This paper focuses on the power-level control of nuclear power plants (NPPs) in the presence of lumped disturbances. An adaptive second-order nonsingular terminal sliding mode control (ASONTSMC) scheme is proposed by resorting to the second-order nonsingular terminal sliding mode. The pre-existing mathematical model of the nuclear reactor system is firstly described based on point-reactor kinetics equations with six delayed neutron groups. Then, a second-order sliding mode control approach is proposed by integrating a proportional-derivative sliding mode (PDSM) manifold with a nonsingular terminal sliding mode (NTSM) manifold. An adaptive mechanism is designed to estimate the unknown upper bound of a lumped uncertain term that is composed of lumped disturbances and system states real-timely. The estimated values are then added to the controller, resulting in the control system capable of compensating the adverse effects of the lumped disturbances efficiently. Since the sign function is contained in the first time derivative of the real control law, the continuous input signal is obtained after integration so that the chattering effects of the conventional sliding mode control are suppressed. The robust stability of the overall control system is demonstrated through Lyapunov stability theory. Finally, the proposed control scheme is validated through simulations and comparisons with a proportional-integral-derivative (PID) controller, a super twisting sliding mode controller (STSMC), and a disturbance observer-based adaptive sliding mode controller (DO-ASMC).

• 품질경영학회지
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• 제30권3호
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• pp.150-167
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• 2002

Normative theory suggests that control systems should be designed to complement management's objectives and strategies. However, few empirical studies have focused on how control systems have been modified to complement new manufacturing techniques, such as zero-defect strategy. The major purpose of this study is to examine the effects of the attributes of quality strategy and control system on performance. The previous studies have subdivided quality strategy into the ECL(economic conformance level) and ZD(zero-defect) strategy. To accomplish the purpose, this study empirically analysed the data based on the questionnaires from manufacturing department personnel of 67 Korean companies. The major results are as follows. The companies that had implemented the ZD strategy and its control system outperformed the companies that had implemented ECL strategy. Also, the ZD strategy differs from ECL strategy in control system, the criteria of performance evaluation and feedback frequence variable. There is no difference in quality performance monitoring and communication variable. From this results, although many companies have strived for continuous improvement of quality, it was restricted in improvement activities that dont's required much investment cost, quality performance monitoring and communication.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 1998년도 춘계학술대회논문집; 용평리조트 타워콘도, 21-22 May 1998
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• pp.670-677
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• 1998

Many of the adaptive noise control systems utilize a form of the least mean square (LMS) algorithm. In the active control of noise, it is common practice to locate an error microphone far from the control source to avoid the near-field effects by evanescent waves. Such a distance between the control source and the error microphone makes a certain level of time-delay inevitable and, hence, may yield undesirable effects on the convergence properties of control algorithms such as filtered-x LMS. This paper discusses the dependence of the convergence rate on the acoustic error path in these popular algorithms and introduces new algorithms which increase the convergence region regardless of the time-delay in the acoustic error path. Performances of the new LMS algorithms are presented in comparison with those by the conventional algorithms based on computer stimulations and experiments.

• International Journal of Contents
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• 제9권4호
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• pp.67-71
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• 2013

This study examined the effects of biofeedback postural control training on the weight distribution rate and functional ability of subjects with stroke. A total of 30 stroke patients were enrolled in this study. Subjects were divided into a biofeedback postural training group (experimental group, n=15) and a dynamic balance training group (control group, n=15). Experimental subjects received biofeedback postural training and control subjects received dynamic balance training for 30 minutes per day, 5 times per week over a 6 week period. Weight distribution rate and functional ability were measured to identify the effect of the biofeedback postural training. Significant difference in weight distribution rate was observed in the experimental group, compared with the control group (p=0.05), and a significant difference in functional ability. The results of this study provide evidence in support of incorporating a biofeedback postural training for the improvement of weight distribution rate and functional ability of stroke patients.

• 제어로봇시스템학회논문지
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• 제15권12호
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• pp.1157-1162
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• 2009

The aerodynamic torque and power caused by the interaction between the wind and blade of wind turbine are highly nonlinear. For this reason, the overall dynamic behaviors of wind turbine have nonlinear characteristics. The aerodynamic nonlinearity also affects properties of torque control for wind turbine. In this paper, the nonlinear aerodynamic property according to the wind speed below rated power and its effects on the torque control system are investigated. Nonlinear parameter representing change of aerodynamic torque with respect to rotor speed is obtained by linearization technique. Effects of this aerodynamic nonlinear parameter on the closed-loop torque system with PI controller for an 1.5 MW wind turbine are presented.

• 대한가정학회지
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• 제45권6호
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• pp.101-111
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• 2007

This study examined the relationships between children's perceptions of mother's psychological control, and children's behavior problems(depression, anxiety, withdrawal, and aggression). In order to expand the study on the relationships, special attention was given to the possible mediator effects of children's emotional autonomy on the relationships. The subjects were 293 6th graders residing in Cheonan. It was found that children's perceptions of mother's psychological control was significantly related with the level of children's depression, anxiety, withdrawal, and aggression. Children's emotional autonomy were found to be a significant mediator of the relationship between mother's psychological control and children's depression and aggression. No significant mediator effect of emotional autonomy was found in the relationship between mother's psychological control and children's withdrawal and anxiety.