• Journal of the Korea Furniture Society
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• v.28 no.1
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• pp.53-59
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• 2017

Wooden dowels are commonly used to join the particleboard members together in many types of structures, But little information is available concerning their holding properties in domestic particleboard. This study was performed to determine the withdrawal loads and strengths on the effect of diameter of dowel and hole clearance. The test block was manufactured from 15 mm thick domestic particleboard. The dowel was manufactured 6, 8 and 10 mm diameters from korean castanea, korean pine and tuliptree. Research reported here indicates that withdrawal loads increase, but withdrawal strengths decrease, as the dowel diameter increases. This study also indicates that dowel withholding load and strength for particleboard less decrease than those for domestic wood as a hole clearance decreases.

• Journal of the Korean Home Economics Association
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• v.46 no.4
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• pp.15-24
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• 2008

The main purpose of this study was to examine the main and interaction effects of inhibition, day-care experiences and mothers' controlling child-rearing behavior on young children's social withdrawal in peer situations. A total of 62 young children(34 boys; 28girls) enrolled in day-care center and their mothers participated in this study. Data on child inhibition and parenting were gathered via questionnaires whereas the quality of day-care and social withdrawal were observed in the day-care center. As results, the quality of day-care and mothers' controlling child-rearing behavior were negatively related to social withdrawal. Further, both day-care entry age and the quality of day-care were served as an intervening variables between child inhibition and social withdrawal.

• Journal of the Korean Home Economics Association
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• v.49 no.9
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• pp.15-24
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• 2011

We investigated the effects of maternal parenting behavior and preschoolers' social skills on the children's withdrawal behavior. The participants were 92 mothers of five year-old preschoolers and their teachers from two day care centers and one kindergarten in Seoul and Gyeong-gi province. The data were analyzed by using descriptive statistics, correlation analysis, t-test and hierarchical regression. The major findings were summarized as follows: (1) there were no differences between the boys' and girls' withdrawal behavior. (2) the mothers' consistent parenting behavior and preschoolers' lack of assertive behavior explained the children's withdrawal behavior. In conclusion, maternal parenting behavior and preschoolers' social skills influence on the children's withdrawal behavior.

• Journal of the Korean Home Economics Association
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• v.41 no.4
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• pp.85-100
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• 2003

Maternal beliefs about preschoolers' displays of aggression and social withdrawal and the extent to which their strategies for dealing with these behaviors can be predicted from beliefs were examined. And the extent to which maternal childrearing behavior and preschoolers' social problematic behaviors can be predicted from beliefs. 202 mothers of 5-year-old(114 boys; 88 girls) were presented with descriptions of hypothetical incidents of peer-directed aggression and social withdrawal. Maternal beliefs were different according to kinds of problematic behaviors. Thus most mothers attributed preschoolers' aggression to situational factors, social withdrawal to disposition. Mothers felt embarrassed about aggression and concerned about social withdrawal. The power assertive strategies were more used for dealing with aggression than social withdrawal. The choice of strategies for dealing with these behaviors and maternal childrearing behavior were related to maternal beliefs. Also preschoolers' social problematic behaviors were effected from maternal beliefs and childrearing behavior.

• The Journal of the Acoustical Society of Korea
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• v.18 no.4
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• pp.23-30
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• 1999

In this study, we propose a new optimization algorithm for a withdrawal weighted SAW transversal filter to satisfy given, specifications such as bandwidth, ripple, insertion loss, and sidelobe rejection level. An analysis tool for the withdrawal weighted filter has been produced by means of the delta function model, and has been applied to the design of a filter consisting of an uniform input IDT and a withdrawal weighted output IDT. This optimization algorithm consists of three routines, which eventually determines eight design parameters to satisfy the performance specifications. At the first step, the number of input and output IDT fingers and their geometrical size are determined by the insertion loss specification. At the next step, the bandwidth is controlled by the change of the IDT finger position. Finally, the sidelobe rejection level is modified through the add/skip technique of IDT fingers. The algorithm in this paper is distinct from conventional techniques in that it can simultaneously consider all the specifications such as bandwidth, ripple, sidelobe rejection level and insertion loss, and optimize the geometry of the withdrawal weighted SAW filter.

• Journal of the Korean Wood Science and Technology
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• v.19 no.4
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• pp.43-51
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• 1991

This study was carried out to determine the withdrawal strength of various screws according to root diameter of screw and embeded length on the face and edge of domestic particleboard and medium density fiberboard. The obtained results were as follows: 1. The withdrawal strength of screw in domestic particleboard and medium density fiberboard was closely related to embeded length of the screw but less dependent on root diameter of the screw. 2. The withdrawal strength on the face and edge of domestic particleboard could be predicted by means of the following expression: $F_{Pf}=4.60{\times}D^{0.24}{\times}L^{1.14}(R^2=0.87)$ $F_{Pe}=0.54{\times}D^{0.43}{\times}L^{1.73}(R^2=0.84)$ Where: $F_{Pf}$ : withdrawal strength on the face of particleboard(kgf) $F_{Pe}$=withdrawal strength on the edge of particleboard(kgf) D=diameter of the screw(mm) L=embeded length(mm) 3. The withdrawal strength on the face and edge of domestic medium density fiberboard could he predicted by means of the following expression: $FM_f=1.53{\times}D^{0.53}{\times}L^{1.39}(R^2=0.93)$ $F_{Me}=1.14{\times}D^{0.66}{\times}L^{1.36}(R^2=0.87)$ where: $F_{Mf}$ = withdrawal strength on the face of medium density fiberboard(kgf) $F_{Mf}$=withdrawal strength on the edge of medium density fiberboard(kgf).

• Journal of Korean Society on Water Environment
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• v.23 no.2
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• pp.228-235
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• 2007

For efficient turbid water withdrawal in the Imha reservoir, a selective withdrawal facility was recently installed and operated during summer season of year 2006. In this research, CE-QUAL-W2 model was utilized to assess the efficiency of the selective withdrawal facility, in comparison with the original surface withdrawal, on turbid water management. Model calibration was carried out using data observed at four automatic monitoring stations in the reservoir. It was found that the model appropriately simulated, with the RMSE less than 5.2 NTU, the observed vertical and horizontal distributions of water temperature and turbidity as well as the location of maximum turbid water at each monitoring station. The analysis results showed that selective withdrawal is more effective in removing high turbid water than surface withdrawal as selective withdrawal contributed to reducing $35Mm^3$ of high turbidity water (> 100 NTU) in the reservoir by increasing outflows of high turbid water. Therefore, effective management of turbid water in the reservoir can be achieved by changing locations of intake depending on turbid water distribution conditions. The results of this study will provide some basic information for establishing better operation strategies to cope with turbid water problems.

• Journal of Convergence for Information Technology
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• v.10 no.12
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• pp.226-235
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• 2020

This study aimed to identify the integral factors influencing the attitudes of nursing students toward withdrawal of life-sustaining treatments. Methods: 139 nursing students were selected from the school of nursing of a single university. Questionnaires were used as measurement tools to measure their good death recognition, attitude towards death & towards withdrawal of life-sustaining treatment. The degree of good death recognition, attitude towards death & towards withdrawal of life-sustaining treatment were analyzed using descriptive statistics. Correlation between variables was analyzed using Pearson's correlation coefficient and factors influencing the attitude towards withdrawal of life-sustaining treatment using multiple linear regression. Results: Attitude towards withdrawal of life-sustaining treatment was significantly positively correlated with good death recognition(r=.312, p=.000). As a result of multiple linear regression, good death recognition significantly influenced (β=.312, p=.000), accounting for 8.5% of the variance in attitude towards withdrawal of life-sustaining treatment. Conclusions: The results from this study can be contribute to develop educational programs to foster positive attitudes towards withdrawal of life-sustaining treatment.

• Journal of Families and Better Life
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• v.34 no.4
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• pp.77-88
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• 2016

This study was conducted in order to find out protective factors on adolescent's social withdrawal. The purpose of this study was to test the mediator effects of adolescent's ego-resilience in the relation between affectionate parenting attitudes and adolescent's social withdrawal. The data were collected from 586 students of high schools located in 'D' city, Korea. Adolescents completed questionnaires on 'My Memories of Upbringing(EMBU-short)', ego-resilience, and 'Korean Youth Self Report(K-YSR)' scales. The correlation and structural equation model were conducted to examine the relations between the variables by using the SPSS 21.0 and AMOS 21.0. The results are as follow: First, while the affectionate parenting attitudes did not directly affect the adolescent's social withdrawal, the ego-resilience had a direct effect on the adolescent's social withdrawal. Second, there was a significant mediator effect of the adolescent's ego-resilience between the affectionate parenting attitude and adolescent's social withdrawal. In conclusion, these results can be used as basic data to prevent social withdrawal of adolescents and increase their ego-resilience.

• Journal of the Korean Wood Science and Technology
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• v.18 no.2
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• pp.79-85
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• 1990

Traditional complex joints have used to a wide variety of wooden furniture construction. Dowel joint is the most popular joint s. However design of this joint to meet specified service condition has been hampered by a lack of proven design formulas which can be use to predict their strength. The object of this study is to investigate the withdrawal strength and effect of dowel diameters in wood and wood based materials. The obtained results were as follows; 1. The relationship between withdrawal strength and dowel diameter is found to be linear. 2. Withdrawal strength of medium density fiberboard and Sepetir in end-to-side joints is superior to Antiaris, particleboard and plywood. 3. In end-to-end joints, withdrawal strength of medium density fiberboard is the most superior joint. but Sepetir. Antiaris and plywood have similarly strength and particleboard is inferiority. 4. Withdrawal strength in end-to-end joints of Antiaris and plywood is higher than in end-ta-side joints. But in end-to-end joints of Sepetir. medium density fiberboard and particleboard is similarity in end-to-side joints.