• Proceedings of the Korean Institute of Building Construction Conference
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• 2010.05b
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• pp.67-68
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• 2010

Recently, there were not enough studies regarding the mix adjustment and changes of normal physical properties of slump flow type concrete in domestically. Therefore in this paper, it is aimed securing the fundamental data about flow its mix design method by experimental research. The experiment includes the adjustment of the way for slump flow type concrete by the variation of size of coarse aggregate. In the result, it is advisable raising the ratio of fine aggregate and unit water amount by considering the specific surface when increasing the Gmax size.

• Child Health Nursing Research
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• v.11 no.3
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• pp.322-329
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• 2005

Purpose: This study was done to investigate satisfaction with life in adolescents, and to identify factors affecting satisfaction with lift for adolescents. Method: The participants were 540 adolescents. Data were collected through self-report questionnaires which were constructed to include satisfaction with life, mental health, family adaptability and cohesion, and school adjustment. The data were analyzed using the SPSS program. Results: Satisfaction with life in adolescents correlated with mental health, family adaptability and cohesion, and school adjustment. Satisfaction with lift in adolescents was significantly different according to scholastic achievement, parents being alive, economic level of family, and types of family cohesion and adaptability. Significant predictors influencing satisfaction with life in adolescents were school adjustment, family cohesion, mental health, and economic level of family, and these predictors accounted for $28.3\%$ of the variance in satisfaction with lift. Conclusion: The above findings indicate that satisfaction with life in adolescents is influenced by mental health, family function, and school adjustment. Therefore when nursing interventions are developed to improve satisfaction with life in adolescents, these factors need to be considered.

• Industrial Engineering and Management Systems
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• v.12 no.3
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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.

• Korean Management Science Review
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• v.28 no.1
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• pp.141-158
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• 2011

This study concerns with an applicability of the management science approach to the score adjustment among the College Scholastic Aptitude Test(CSAT) optional subjects. A linear programming model is developed to minimize the sum of score distortions between optional subjects. Based on the analysis of the 377,089 CSAT(2010) applicants' performances in social science test section, this study proposes a new approach for the score equating or linking method of the educational measurement theory. This study makes up for the weak points in the previous linear programming model. First, the model utilize the standard score which we can get. Second, the model includes a goal programming concept which minimizes the gap between the adjusting goal and the result of the adjustment. Third, the objective function of the linear programing is the weighted sum of the score distortion and the number of applicants. Fourth, the model is applied to the score adjustment problem for the whole 11 optional subjects of the social science test section. The suggested linear programming model is a generalization of the multi-tests linking problem. So, the approach is consistent with the measurement theory for the two tests and can be applied to the optional three or more tests which do not have a common anchor test or a common anchor group. The college admission decision with CSAT score can be improved by using the suggested linear programming model.

• Women's Health Nursing
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• v.12 no.4
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• pp.355-362
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• 2006

Purpose: This study was to investigate the degree of postpartum depression and its predictors at six months postpartum. Methods: The subjects were 161 women six months after delivery who were registered with the public health center. The instruments included a survey of various characteristics, the Edinburgh Postnatal Depression Scale(EPDS), husband support, maternal self-esteem, and marital adjustment scale. The data was analyzed using the $x^2$-test, t-test, the Pearson correlation coefficients, and the logistic regression. Results: The point prevalence of postpartum depression at six months postpartum was 14.3%, corresponding to a score of 12 or higher on the EPDS. Postpartum depression was significantly associated with husband support, maternal self-esteem, and marital adjustment. Predictors of postpartum depression identified by the logistic regression analysis include marital adjustment (OR .29 [95% CI .13-.61]) and the delivery method(OR 3.57 [95% CI 1.25-10.23]). Conclusion: Strategies for improving postpartum depression, considerations of husband support and maternal self-esteem are important in research and practice. In addition, interventions for reducing Cesarean delivery and improving marital adjustment are needed.

• Korean Journal of Human Ecology
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• v.18 no.1
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• pp.93-112
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• 2009

The purpose of this study is to identify stresses and adjustment elements of Chinese students in Korea. The data analysis was conducted by qualitative method based on interviews with sixteen Chinese students as a focus group by the help of two interpreters. The results were as follows: first, stresses of Chinese students were from 'cultural difference', 'language', and 'financial', 'educational' and 'psychological stress', and 'university culture in Korea'. Those categories were divided into several sub categories. Second, ten helpful elements Chinese students could adapt themselves to Korean university life were such as 'Help of Korean professor and friends', 'Chinese friends' help', 'English-oriented lecture', 'Cultural affinity to Korea', 'Fluency in Korean language', 'Integration to Korean culture', 'Pride in Chinese culture', 'Individual effort', 'Satisfaction with educational environment', 'Perception of self-growth'.

• Proceedings of the KIPE Conference
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• 2008.06a
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• pp.348-350
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• 2008

A link voltage adjustment converter employing load power estimator for notebook computer adaptor is proposed. It is consisted of the boost converter as a power factor correction stage and the LLC resonant converter as a DC/DC conversion stage with a newly introduced link voltage adjustment method employing load power estimator, which helps to reduce the transformer size and peak of output voltage ripple, maintaining high efficiency over all the load condition. Experimental results with 85W converter are given to verify the validity of the proposed circuit.

• Women's Health Nursing
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• v.13 no.3
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• pp.149-156
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• 2007

Purpose: This study aimed to elucidate the prevalence of breast feeding and maternal psychosocial predictors affecting the breast feeding practice at six months postpartum. Method: One hundred and sixty one mothers at six months postpartum were conveniently recruited in two public health center in Jeju-city. Subjects completed a well-structured questionnaire regarding the feeding types of the child, maternal self-esteem, the Edinburgh Postnatal Depression Scale (EPDS), husband support, and marital adjustment scale. The data was analyzed using the $X^2-test$, t-test, Pearson correlation coefficients, and logistic regression. Result: The prevalence of breast feeding at six months postpartum was 29.9%. Predictors of breast feeding practice identified by the logistic regression analysis include first feeding type after delivery, marital adjustment, readiness for maternal role and work state. Conclusion: The prevalence of breast feeding practice was lower than WHO desired at six months postpartum. Therefore, the findings support the need for breast feeding education including interventions focused on improving readiness for maternal role and marital adjustment.

• Journal of Institute of Control, Robotics and Systems
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• v.21 no.7
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• pp.677-683
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• 2015

This paper proposes a helicopter direction adjustment system using barycenter shift. Most conventional methods for direction adjustment of uniaxial helicopters rely on the angle of inclination of the main rotor. However, the inherent burden of the bearing of the main rotor and serious abrasion of the helicopter using the above methods may results in loss of balance. To decrease abrasion and enhance the barycenter stability, the proposed method was used to shift the barycenter of the helicopter instead of the main rotor for direction adjustment. We set a biaxial ARM on a uniaxial helicopter to adjust the direction of ARM pointing as well as to realize stable direction control when the helicopter loses its balance. The method may enhance the landing safety of helicopters in emergencies. Uniaxial helicopters can be controlled under any environment by adjusting the motor parameters of the ARM which is dependent on the center of mass using neural network. The experiment results show that the helicopter can return to the starting position quickly under the external disturbance.

• Human Ecology Research
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• v.52 no.5
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• pp.519-528
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• 2014

This study explores how the main variables of youth going through a transition period (parents' nurturing behavior, the youth's self-esteem and ego resilience, the peer group relationships) affect the youth's school adjustment. It also analyzes the effects of theses variables on the youth's dependence on cell phones, which are considered a necessity in modern society. This research is verified by using a structure model verification method based on data from the Korean Children Youth Panel Study. According to the research, first, 1st-year students in middle school show better adjustment to their school life and less dependence on cell phones when they have a stronger sense of self-esteem and ego resilience; further, it is revealed that cell phone dependence has an indirect influence on the school life of these children. Second, they tend to show better adjustment to their school life and less dependence on cell phones when their parents' nurturing behaviors are more positive. Third, these children tend to depend more on cell phones when they have a positive peer group relationship, Moreover, cell phone dependence has an indirect influence on their school life. When considering the impact of cell phone to youth in modern society, need to prepare proper training program for correct uses and preventing from addiction.