• International Journal of Aeronautical and Space Sciences
• /
• 제17권4호
• /
• pp.593-603
• /
• 2016

This paper presents the development of linear quadratic regulation and output tracking algorithms using output feedback when both the measurement and performance output equations contain direct feedthrough terms. Although all physical systems can be modeled without direct feedthrough, there are still many situations where system models with direct feedthrough are important. For this situation, we modify previous work on the same topic for systems without direct feedthrough. It is shown that for the regulation problem, the optimal output feedback gain for a direct feedthrough case can be directly obtained, via a transformation, from the approach used for systems without direct feedthrough. However, for the tracking problem, a new set of coupled matrix equations for determining the optimal output feedback gain is derived from the necessary conditions for minimizing the cost function. The effectiveness of the developed algorithms is demonstrated using numerical examples.

• 아동학회지
• /
• 제32권5호
• /
• pp.49-65
• /
• 2011

The purpose of this study was to investigate the structural relationship between the related variables of children's internalization and externalization of problems. A total of 709 elementary school students residing in Daegu City and Kyungpook province completed questionnaires which assessed family interaction functions, emotional regulation, self-control, and internalization and externalization of problems. The sample variance-covariance matrix was analyzed using AMOS 19.0, and a maximum likelihood minimization function. Goodness of fit was evaluated using the SRMS, RMSEA, and its 90% confidence interval, CFI, and TLI. The results were as follows : First, the function of family interaction, and emotional regulation had a significant direct effect on the internalization of problems. Moreover, emotional regulation, self-control and internalization of problems had a statistically substantial direct effect on the externalization of problems. Second, family interaction functions did not have a statistically significant direct on children's externalization of problems, although it may well have an indirect effect on children's externalization of problems through emotional regulation and self-control. Finally, self-control did not enjoy a direct effect on children's internalization of problems.

• 아동학회지
• /
• 제29권5호
• /
• pp.133-150
• /
• 2008

In this study of the influence of marital conflict and of children's temperament and emotion regulation on problem behavior, 194 mothers of 3- to 5-year-old children responded to the O'Leary- Poter Scale(1980), the Emotionality, Activity and Shyness scale(Buss & Plomin, 1984) and the Emotion Regulation Checklist(Shields & Cicchetti, 1997); teachers rated children's behavior on the Problem Behavior Questionnaire(Behar & Stringfield, 1974). Data were analyzed by independent t-tests, correlations, and multiple regressions. Results demonstrated that shyness, activity, and emotion regulation had direct effects on hostile-aggressive behaviors. Shy temperament had a direct effect on fearful-anxious behavior. Both marital conflict and temperament influenced hostile-aggressive behaviors indirectly through emotion regulation, implying a crucial role of emotion regulation in preschoolers' social development.

• Human Ecology Research
• /
• 제55권1호
• /
• pp.1-12
• /
• 2017

This study examines the relationship among children's smart device immersion tendency, children's self-regulation, and pro-social behavior as well as investigates the mediating effect of self-regulation between children's smart device immersion tendency and pro-social behavior. Participants were composed of 263 4-year-old children attending kindergarten in Incheon and Gyeonggi province. Data were analyzed by means of Pearson's correlation coefficients in SPSS, the structural equation model and bootstrapping in AMOS. The results are as follows. First, there is a statistically meaningful relationship among children's smart device immersion tendency, self-regulation, and pro-social behavior. There is a negative correlation between children's smart device immersion tendency and children's self-regulation as well as pro-social behavior; however, there is positive relationship between children's self-regulation and pro-social behavior. Second, children's smart device immersion tendency had a direct effect on children's self-regulation. In addition, children's self-regulation indicated a direct effect on children's pro-social behavior. Third, children's self-regulation was found sufficient to mediate the relationship between children's smart device immersion tendency and pro-social behavior. The results indicate that the effort to increase children's self-regulation may decrease the negative effect toward children's pro-social behavior caused by smart device immersion tendencies.

• 아동학회지
• /
• 제36권3호
• /
• pp.155-174
• /
• 2015

This study examined the structural relationships among the child's playfulness, self-regulation, and ego-resilience. Through an examination of these relationship, this research aimed to analyze the direct and indirect influences of the child's playfulness on self-regulation and ego-resilience. The participants of this study consisted of 359 children attending kindergartens in the Seoul and Gyeonggi-do area. The sample was analyzed using the SPSS 21.0, AMOS 21.0, and Maximum Likelihood method (ML). The significance of the indirect effects was tested by means of bootstrapping. The results of this study were as follows: (i) the child's playfulness had a direct influence on relational ego-resilience; (ii) the child's playfulness directly affected self-regulation; (iii) the child's self-regulation directly affected relational and aptitudinal ego-resilience; and (iv) the child's playfulness was indirectly influential to relational resilience and resilient competency through self-regulation. The discussion also took into account the specific methods which can be used to enhance the child's playfulness and self-regulation.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2018년도 전력전자학술대회
• /
• pp.522-524
• /
• 2018

A New Direct AC LED Driver has been proposed for wide output power range and precise constant current regulation using an advanced auto commutation topology. The conventional shunt regulation method provides a stepped input current shape by fixed regulation references in the linear regulator of the each channel, which results in poor current regulation and high THD. The conventional method needs to assign a linear regulator in each LED channel so that the number of linear regulator increases when extending the number of channels especially at high power application. The proposed regulation method can drive multiple switches to regulate each LED channel current by a single amplifier with sinusoidal reference so that large number of LED channel can be simply extended with less BOM cost and low THD is obtained with the accurate current regulation thanks to the sinusoidal input current control in the closed loop control. To confirm the validity of the proposed circuit, theoretical analysis and experimental results from a 20-W LED driver prototype are presented.

• Safety and Health at Work
• /
• 제8권1호
• /
• pp.59-66
• /
• 2017

Background: Despite considerable efforts made in recent years, the industrial accident rate and the fatality rate in the Republic of Korea are much higher than those in most developed countries in Europe and North America. Industrial safety policies and safety regulations are also known to be ineffective and inefficient in some cases. Methods: This study focuses on the quantitative evaluation of the effectiveness of direct safety regulations such as safety certification, self-declaration of conformity, and safety inspection of industrial machines in the Republic of Korea. Implications on safety policies to restructure the industrial safety system associated with industrial machines are also explored. Results: Analysis of causes in industrial accidents associated with industrial machines confirms that technical causes need to be resolved to reduce both the frequency and the severity of such industrial accidents. Statistical analysis also confirms that the indirect effects of safety device regulation on users are limited for a variety of reasons. Safety device regulation needs to be shifted to complement safety certification and self-declaration of conformity for more balanced direct regulations on manufacturers and users. An example of cost-benefit analysis on conveyor justifies such a transition. Conclusion: Industrial safety policies and regulations associated with industrial machines must be directed towards eliminating the sources of danger at the stage of danger creation, thereby securing the safe industrial machines. Safety inspection further secures the safety of workers at the stage of danger use. The overall balance between such safety regulations is achieved by proper distribution of industrial machines subject to such regulations and the intensity of each regulation. Rearrangement of industrial machines subject to safety certification and self-declaration of conformity to include more movable industrial machines and other industrial machines with a high level of danger is also suggested.

• Journal of Electrical Engineering and Technology
• /
• 제4권2호
• /
• pp.234-239
• /
• 2009

In this article we present the simulation results of induction motor speed regulation by direct torque control with a classic PI regulator. The MATLAB Simulink programming environment is used as a simulation tool. The results obtained, using a fuzzy logic, shows the importance of this method in the improvement of the performance of such regulation.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2023년도 봄 학술논문 발표대회
• /
• pp.341-342
• /
• 2023

This study empirically validates whether the effect of strengthening the legal regulations in the construction industry under the 'Construction Business Act' is true in order to expand the direct construction of the comprehensive construction corporation. Checking the effectiveness of the legal regulation that can force direct construction of the required scope of construction will not only be a logical background in the strengthening of law regulations but also suggest arguments that contradict some construction companies called legal regulation.

• 대한가정학회지
• /
• 제45권2호
• /
• pp.1-22
• /
• 2007

The purpose of this study was to investigate the effect of mother's characteristics, mediated by disciplinary methods and young children's emotional regulation, on young children's aggression. Subjects of this study consisted of 342 young children drawn from seven preschools in Cheongju city. The pilot study was used to examine the applicability of survey instrument. Data were analyzed by the method of frequency, percentage, Cronbach' ${\alpha}$, factor analysis, T-test. F-test, and Duncan post-hoc test using SPSSWIN program. The test of model was done with analysis of correlational matrix in LISREL VII package using a maximum likehood estimation. The results of this research were as follows: First, there were statistically significant differences in mother's characteristics consisting of neurosis symptom and extroversions, disciplinary methods consisting of coercive-punishment and indifferent-irresponsibility, young children's emotional regulation, and young children's aggression consisting of relation and overtness according to some socio-demographic variables. Girls had the higher emotional regulation than boys. Second, the direct effects of disciplinary methods and emotional regulation on boys' aggression were different in between relational and overt aggression. Third, the variables predicting boys' emotional regulation directly were the same in both relational and overt aggression. Forth, the direct effect of mother's characteristics on disciplinary methods was different in between coercive-punishment and indifferent-irresponsibility. Fifth, the indirect effects of mother's characteristics, mediated by disciplinary methods and young children's emotional regulation, on young children's aggression were partly supported in this study. Sixth, the theoretical model of the impact of mother's characteristics, disciplinary methods, and young children's emotional regulation on young children's aggression was different according to gender.