• Journal of the Korean Home Economics Association
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• v.47 no.6
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• pp.51-66
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• 2009

The purpose of this study was to develop a model for preschool children's self regulation by examining the effects of maternal parenting variables on preschool children's self regulation. The subjects were 1219 mothers of 4- to 6-year-old preschool children attending kindergarten or child care centers located in Seoul and Kyunggi Province, Korea. For data analysis, exploratory factor analysis(EFA) and confirmatory factor analysis(CFA) were applied to the survey data in the first phase and structural equation modeling(SEM) analysis in the second phase. The major results of this study were as follows: maternal parenting stress and maternal behavior were the most direct influential variables on preschool children's self-regulation. Moreover, maternal parenting efficacy was indirectly mediated through maternal behavior.

• Journal of Families and Better Life
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• v.20 no.6
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• pp.61-68
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• 2002

Relations of regulation, negative emotionality and problem behaviors to school adjustment were examined for 1,105 elementary school children from 558 2nd grade and 547 5th grade. Children reported their regulation and negative emotionality and teachers rated children's problem behaviors such as hyperactive and withdrawal behaviors and school adjustment including school life, grades, social competence with peers and teacher. Measures of problem behaviors were highly contributed to the prediction of children's school adjustment, especially hyperactive to school life and grades and withdrawal to social competence with peers and teacher. Behavioral regulation was associated with school adjustment including school life and social functioning with teacher and was able to modulate the influence of hyperactive. It was found that depression had both direct and indirect effects via withdrawal behavior on school adjustment.

• The Korean Journal of Community Living Science
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• v.28 no.1
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• pp.155-165
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• 2017

This study examined the mediating effects of self-esteem on the teacher-young child relationship and self-regulation ability of young children. A survey was conducted on a random sample of 252 young children aged 3-5 years attending a nursery in Gwang-ju, Korea. Based on the data, Person's correlations between variables were analyzed, and hierarchical regression analyses were conducted to identify the direct and indirect effects of the teacher-young child relationship and self-esteem on the self-regulation ability of the young children. First, there were positive correlations among the teacher-young child relationship (intimacy) and self-esteem as well as self-regulation ability. There were negative correlations among the teacher-young child relationship (conflict, dependence) and self-esteem as well as self-regulation ability. Second, self-esteem partially mediated the correlation between the teacher-young child relationship and self-regulation ability. The results suggest that self-esteem may affect the self-regulation ability of young children as a mediating response to the teacher-young child relationship.

• Korean Journal of Child Studies
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• v.37 no.4
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• pp.117-128
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• 2016

Objective: The purpose of this study was to explore the structural relationships of child negative emotionality, mother rejective parenting, teacher-child conflict, and child emotion regulation on child aggression. Methods: The participants in this study were 3- to 5-year-old kindergarten children, their mothers, and their teachers (all of whom lived in Busan). The data were analyzed using PASW Statistics 18.0 and AMOS 21.0. For data analysis, frequency, Cronbach's alphas, Pearson's correlation coefficients, SEM were used. Results: First, mother rejective parenting had an indirect effect on child aggression through child emotion regulation. Second, teacher-child conflict had a direct effect on child aggression and had an indirect effect on child aggression through child emotion regulation. Third, child negative emotionality had an indirect effect on child aggression through mother rejective parenting and teacher-child conflict and child emotion regulation. Conclusion: These finding suggest the importance of mediating effect of mother rejective parenting, teacher-child conflict and child emotion regulation between child negative emotionality and aggression.

• Educational Technology International
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• v.20 no.2
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• pp.223-255
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• 2019

The purpose of this study is to draw implications for designing online tools to support monitoring in collaborative learning. For this purpose, eighteen research papers that explored learner dashboards and group awareness tools were analyzed. The driving questions for this analysis related to the information and outcomes that must be monitored, whose performance they represent, and who monitors the extent of learning. The analytical frameworks used for this study included the following: three modes of co-regulation in terms of who regulates whose learning (self-regulation in collaborative learning, other regulation, and socially shared regulation) and four categories of dashboard information to determine which information is monitored (information about preparation, participation, interaction, and achievements). As a result, five design implications for learner dashboards that support monitoring were posited: a) Monitoring tools for collaborative learning should support multiple targets: the individual learner, peers, and the entire group; b) When supporting personal monitoring, information about the individual and peers should be displayed simultaneously to allow direct comparison; c) Information on collaborative learning achievements should be provided in terms of the content of knowledge acquired rather than test scores; d) In addition to information related to interaction between learners, the interaction between learners and learning materials can also be provided; and e) Presentation of the same information to individuals or groups should be variable.

• Journal of Institute of Control, Robotics and Systems
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• v.13 no.10
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• pp.990-999
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• 2007

We deal with second order NMP(Non-Minimum Phase) systems which are difficult to control with conventional methods because of their inherent characteristics of undershoot. In such systems, reducing the undesirable undershoot phenomenon makes the response time of the systems much longer. Moreover, it is impossible to control the magnitude of undershoot in a direct way and to predict the response time. In this paper, we propose a novel two sliding mode control scheme which is capable of determining the magnitude of undershoot and thus the response time of NMP systems a priori. To do this, we introduce two sliding lines which are in charge of control in turn. One is used to stabilize the system and achieve asymptotic regulation eventually like the conventional sliding mode methods and the other to stably control the magnitude of undershoot from the beginning of control until the state meets the first sliding line. This control scheme will be proved to have an asymptotic regulation property. The computer simulation shows that the proposed control scheme is very effective and suitable for controlling the second order NMP system because it can decide the magnitude of undershoot in a direct and stable way and reduce the response time compared with the conventional ones.

• Journal of the Korean Society of Safety
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• v.30 no.6
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• pp.26-33
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• 2015

This study suggests systematic procedures to improve safety policies on prevention of industrial accidents associated with industrial machines and devices. Specifically, new method of cause analysis of industrial accidents associated with industrial machines and devices is suggested and the related accident data are re-analyzed. Effectiveness of direct safety regulations such as safety certification, self-declaration of conformity, safety device regulation and safety inspection of industrial machines and devices are also analyzed. Based on those analysis results, transition from the current user-oriented safety device regulation to more balanced direct regulations on both manufacturer and user is suggested. Together with severity and frequency of industrial accidents, unit severity and unit frequency need to be taken into account to further assess the risk associated with a particular industrial machine or device. Balance between safety regulations will be realized by proper adjustment of lists of safety certification and inspection, and certification and inspection standards. This will also guarantee the maximum benefit over cost in such safety regulations.

• Journal of the Korean Society of Safety
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• v.30 no.1
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• pp.1-7
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• 2015

This study first addresses the ineffectiveness of indirect regulation on industrial machines. Analysis of causes of industrial accidents associated with industrial machines further reveals the fact that technical causes need to be resolved at the manufacturing stage to reduce the frequency and strength of industrial accidents. Balanced safety certification on manufacturers and safety inspection on users of industrial machines are then suggested to effectively resolve such technical causes. The effectiveness of such safety certification and safety inspection can be justified by cost-benefit analysis. Particularly, balance in expected benefits of safety certification and safety inspection is a key issue for validity of such analysis. The accumulated benefit-costs for press brake and portable sawing machine confirm the effectiveness of such safety system.

• Journal of Microbiology
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• v.41 no.3
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• pp.175-182
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• 2003

Production of ribosomally synthesized antimicrobial peptides usually referred to as bacteriocins is an inducible trait in several gram positive bacteria, particularly in those belonging to the group of lactic acid bacteria. In many of these organisms, production of bacteriocins is inducible and induction requires secretion and extracellular accumulation of peptides that act as chemical messengers and trigger bacteriocin production. These inducer peptides are often referred to as autoinducers and are believed to permit a quorum sensing-based regulation of bacteriocin production. Notably, the peptides acting as autoinducers are dedicated peptides with or without antimicrobial activity or the bacteriocins themselves. The autoinducer-dependent induction of bacteriocin production requires histidine protein kinases and response regulator proteins of two-component signal transduction systems. The current working model for the regulation of class II bacteriocin production in lactic acid bacteria and the most relevant direct and indirect pieces of evidence supporting the model are discussed in this minireview.

• Journal of the Korean Society of Industry Convergence
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• v.26 no.4_2
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• pp.649-656
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• 2023

Recently, global warming has become severe, and regulation is established for carbon savings each field. its regulation is applied to various fields using IC engine such as automobile, ship, agricultural machine. Therefore engine block applied Common Rail Direct Injection(CRDI) technology, that carry out thermal-structure analysis to examine design. The thermal load about 900℃ by explosion was applied in cylinder. And pressure about 9 MPa(90 Bar) was applied to structure analysis. As a result, it was the highest at 185.99℃ at the top of cylinder. Static-structure analysis applied thermal load, that was shown maximum equivalent stress at 142.59 Mpa and Maximum principal stress 145.03 MPa, Minimum principal stress -149 MPa. When compare analysis results to material property, it design is safety structurally.