• 한국가구학회지
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• 제28권1호
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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.

• 대한가정학회지
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• 제46권4호
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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.

• 대한가정학회지
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• 제49권9호
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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.

• 대한가정학회지
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• 제41권4호
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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.

• 한국음향학회지
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• 제18권4호
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• pp.23-30
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• 1999

본 연구에서는 통과대역폭, 리플, 저지대역 감쇠도의 필터특성을 고려하여 주어진 입력사양에 부합하는 withdrawal SAW 필터의 새로운 최적화 알고리즘을 개발하고자 하였다. 필터의 성능해석을 위해 델타함수 모델을 이용하였으며, 대표적인 필터구조로서 균일한 입력 IDT에 대해 출력단을 withdrawal weighting하는 경우를 선정, 해석하였다. 이를 위해 여덟개의 설계변수를 선정하였으며 각각의 변화가 성능변수에 미치는 영향을 고려하여 세 단계를 거쳐 최적화 알고리즘을 완성하였다. 첫 단계에서는 삽입손실을 고려하여 입출력 전극수와 형상의 규격을 결정하고 다음 단계에서는 위상반전 방법을 이용하여 대역폭을 조절하며, 마지막 단계에서는 전극을 추가, 제거하는 방법을 통해 저지대역의 특성규격을 만족시켰다. 본 연구를 통해 제시하는 새로운 withdrawal weighting 필터 설계방법은 기존의 설계 방법들과는 달리 통과대역폭, 리플. 저지대역 억압도, 삽입손실 등의 필터특성을 동시에 고려하며 주어진 입력사양에 부합하는 필터를 최적화할 수 있다.

• Journal of the Korean Wood Science and Technology
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• 제19권4호
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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).

• 한국물환경학회지
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• 제23권2호
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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.

• 융합정보논문지
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• 제10권12호
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• pp.226-235
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• 2020

본 연구는 간호대학생들의 연명치료중단 태도에 영향을 미치는 융합적인 요인들을 파악하기 위하여 시도하였다. 연구대상은 4년제 일개 간호대학에 재학중인 간호대학생 139명이였으며 측정 도구는 좋은 죽음에 대한 인식, 죽음 태도, 연명치료 중단 태도에 관한 문항으로 구성되었다. 좋은 죽음에 대한 인식, 죽음 태도, 연명치료중단 태도 정도는 기술통계로 분석하였고 제 변수들 간의 상관관계는 Pearson correlation coefficients, 연명치료중단 태도에 영향을 미치는 요인은 다중 선형 회귀분석(Multiple linear regression)을 적용하였다. 연명치료중단 태도는 좋은 죽음에 대한 인식정도와 유의한 정적상관성이 있는 것으로 나타났다(r=.312, p=.000). 다중회귀분석결과 좋은 죽음에 대한 인식(β=.312, p=.000)이 통계적으로 유의미한 영향을 주는 것으로 확인되어 연명치료 중단 태도의 8.5%를 설명하였다. 본 연구 결과는 간호대학생들의 연명치료 중단에 대한 긍정적인 태도 함양을 도모하기 위한 교육 프로그램 개발에 기여할 수 있을 것이다.

• 가정과삶의질연구
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• 제34권4호
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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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• 제18권2호
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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.