• 산업기술연구
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• 제31권A호
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• pp.11-19
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• 2011

A new PCD (Pitch Circle Diameter) adjustment system has been designed in this study. Traditional system requires repetitive same works in changing automobile tires. The system proposed in this study requires just one simultaneous work to finish the job. We designed the system using Solidworks CAD software. We further investigate the jobs for both cases through work factor method. Based on careful clarification of the job, work factor units were assigned to each work factor. Even if further analysis should be processed for actual field application, the mechanism proposed in this study may provide good reference for practical usage.

• 대한기계학회논문집
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• 제18권12호
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• pp.3149-3158
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• 1994

In this paper, using the formulation of dynamic equivalent load considering the effects of moment load and the equation to estimate the cage rotational speed, the new life equation of deep groove ball bearing under radial and moment loads was proposed. Fatigue life test apparatus with the measuring equipment of shaft and cage speed was designed and developed to be capable of subjecting combined radial and moment load. Fatigue life tests were executed by sudden death test method and the reliability of fatigue lives was evaluated by Weibull distribution analysis. From the results of fatigue tests and analysis, the relationships between film parameters and life adjustment factors were acquired. And it was turned out that so as to estimate the effect of moment load on fatigue life, the life adjustment factor as well as the dynamic equivalent load must be taken into account.

• Industrial Engineering and Management Systems
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• 제12권3호
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• pp.207-223
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• 2013

Revenue management (RM) has been widely used to model products characterized as perishable. Classical RM model assumed that price is the sole factor in the model. Thus price adjustment becomes a crucial and costly factor in business. In this paper, an optimal pricing model is developed based on minimization of soft customer cost, one kind of price adjustment cost and is solved by Lagrange multiplier method. It is formed by expected discounted revenue/bid price integrating quantity-based RM and pricing-based RM. Quantity-based RM consists of two capacity models, namely, booking limit and overbooking. Booking limit, built by assuming uncertain customer arrival, decides the optimal capacity allocation for two market segments. Overbooking determines the level of accepted order exceeding capacity to anticipate probability of cancellation. Furthermore, pricing-based RM models occupancy/demand rate influenced by internal and competitor price changes. In this paper, a mathematical model based on game theoretic approach is developed for two conditions of deterministic and stochastic demand. Based on the equilibrium point, the best strategy for both hotels can be determined.

• 보건교육건강증진학회지
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• 제23권2호
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• pp.91-107
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• 2006

Objectives: The school adjustment problems of the adolescence groups become more aggravated and are on the increase. The objective of this study is to identify the causal relationship of intra-family conflicts, self-concept and school adjustment as health protection behavior. Methods: The study setting is the adolescence groups. Data were collected by self-administered questionnaires from the middle and high school students in Seoul. The study sample consisted of 268 students. Structural Equation Modeling(SEM) analysis was conducted to find the causal relationship of intra-family conflicts, self-concept and school adjustment. Results: This study shows that firstly, the total effects of intra-family conflicts have a negative effect on self-concept(path coefficients=-0.080) and school adjustment(path coefficients=-0.107). And the self-concept factor as an intervening variable are affecting positively on school adjustment(path coefficients=0.411). Secondly, the economic conflicts, personaliy conflicts and social activity conflicts of father and mother among various family conflicts are more highly affecting on self-concept and school adjustment(p<0.01) Conclusions: These results imply that first, communication between parents and students is essential to solve the problems of school adjustment. Especially economic conflicts should be solved to improve the self-concept and school adjustment. second, a variety of programs are available for schools to employ in an effort to provide interventions for students who demonstrate school adjustment. Finally, it is necessary for family, school and all the society members to comprehensively cooperate to solve family conflicts and school adjustment.

• 디지털융복합연구
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• 제15권12호
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• pp.59-70
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• 2017

본 연구는 중도입국 청소년의 학교적응에 영향을 미치는데 있어 위험요인에 대한 보호요인의 조절효과가 있는지를 알아보고자 하였다. 이를 위해 2015년 전국다문화가족실태조사 대상 중 만 9~24세 청소년 자녀 6,079명 데이터에 가중치를 적용한 69,720명을 분석하였다. 분석결과 첫째, 중도입국 청소년의 위험요인인 차별경험, 학교폭력, 우울은 학교적응에 모두 부적인 영향을 미쳤다. 보호요인인 부모관계, 자아존중감, 한국어 능력, 국적취득은 학교적응에 모두 정적인 영향을 보였다. 둘째, 중도입국 청소년의 학교적응에 있어 3개의 위험요인 가운데 우울을 조절하는 보호요인 중에는 자아존중감과 국적취득 변인, 학교폭력을 조절하는 보호요인은 부모관계, 자아존중감, 한국어 능력, 국적취득 변인으로 분석되었다. 본 연구의 분석결과를 토대로 중도입국 청소년에 대한 우울감소, 학력폭력 대처, 다양한 역량강화 프로그램 개발과 지원을 주요 사회복지적 실천방안으로 제시하였다.

• 한국항공우주학회지
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• 제39권12호
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• pp.1107-1114
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• 2011

본 논문에서는 레이저 피닝(Laser peening) 구조물에 대한 피로 수명을 예측하였다. 레이저 피닝에 의해 생성된 압축잔류응력(Compressive residual stress)을 계산하기 위해서 유한 요소 시뮬레이션(Finite element simulation)을 수행하였고, 피로 수명 예측 시에 압축잔류응력 효과를 고려하기 위해서 수정된 Goodman 식을 사용하였다. 또한, S-N 선도 모델 불확실성(Model uncertainty)을 고려한 피로 수명 예측을 위해 부가 적응 인자 접근법(Additive adjustment factor approach)을 적용하여 예측된 피로 수명의 신뢰 구간(Reliable bounds)을 결정하였다.

• 가정과삶의질연구
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• 제27권2호
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• pp.281-292
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• 2009

This study was designed to investigate the effects of children's self-regulation on their friendships and their adjustment to school adjustment. Especially, this study was focused to determine whether children's friendships played a role as ain mediator among the other each variables. The subjects were 212 children in the 5th grade at from 3 elementary schools in located at U city. The data were analyzed by factor analysis, correlation analysis, and path analysis, using SPSS (ver. 14.0) program and LISREL (ver. 8.30) program. The main findings of study were, first, that there were correlations among the children's self-regulation, friendships, and school adjustment, and second, it was found that children's self-regulation influenced on their friendships and their school adjustment. Specially, children's friendships played a role in mediating their self-regulation and their school adjustment.

• 임상간호연구
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• 제22권1호
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• pp.78-87
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• 2016

Purpose: This study was conducted to investigate the factors that influence the psychosocial adjustment of organ transplant recipients. Methods: Participants were 132 organ transplant recipients who received follow-up more than 3 months after the organ transplantation at one general hospital in Seoul. A questionnaire survey was done from November 3 to December 3, 2015. Data were analyzed using descriptive statistics, t-test, ANOVA, Pearson correlation coefficient, and hierarchical multiple regression. Results: Family support, medical staff support and hope were significantly correlated with psychosocial adjustment. In the hierarchical multiple regression analysis, hope appeared to be the most important factor influencing psychosocial adjustment (${\beta}=.39$, p<.001). Conclusion: The findings show that hope had an influence on the psychosocial adjustment of organ transplant recipients. Thus, to improve psychosocial adjustment it is important for nurses to develop interventions to increase hope in organ transplant recipients.

• 수산해양교육연구
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• 제26권1호
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• pp.59-71
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• 2014

The purpose of this study was two folded. The first was to examine relationships among children's self-resilience, their mother's parenting style, family strength and the children's school adjustment and the second was to investigate the relative effects of the three variables on the children's school adjustment. To achieve the purposes, a total of 198 5th and 6th grade children and their mothers were surveyed on children's resilience scale, parenting style scale, family strength scale, and school adjustment scale. As a results, positive relationships among the four variables were observed. Also it was founded that children's self-resilience is the most effective, mothers' parenting style is the second, and family strength is the least factor on school adjustment. From the results the researchers suggested that early intervention is needed to enhance family strength as well as intervention to improve self-resilience in order to increase the children's school adjustment.

• 한국토양비료학회지
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• 제35권2호
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• pp.87-92
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• 2002

북한 지역은 산이 많고, 경사지 밭이 많아 토양 유실이 심하므로, 토지를 보호하는 것이 토양의 지력 유지에 중요하다. 토양 보전 대책 마련을 위해서는 각 지역의 토양 유실 가능량을 예측하는 것이 필요하다. 토양 유실 예측에 USLE가 광범위하게 적용된다. 북한 지역의 토양 유실 예측에 필요한 강수 인자8의 산출이 시도되었다. 북한 지역의 수집 가능한 75개소의 월 강수량 자료를 이용하였다. 월 강수량의 7, 8월 강수 집중도(X)로부터 지역 보정 인자를 산출하였다. 지역 보정 인자($U_{adj}$) 산출을 위한 기본식은 남한의 중북부 지역 20개소의 $EI_{30}$와 월강수량 자료로부터 얻어 낸 식 $$U_{adj}=4.095{\cdot}X-0.878(r=0.689^{**})$$ 을 적용하였다. 북한 지역의 강수량은 606-1,520mm이었으며, 7, 8월 집중도는 34.4%~53.8%이었다. 이에 따른 지역 보정 계수 $U_{adj}$는 0.53~1.33이었으며, 동해안과 산간 지방의 $U_{adj}$ 값이 서해안과 내륙 지방의 $U_{adj}$ 값보다 낮았다. 지역 보정 계수를 고려한 USLE의 강수 인자 $R_{adj}$는 107 ~ 493으로 평가되었으며, 이는 평균 259.6으로 남한의 평균 R 값 434.5보다 낮았다.