• Journal of Korean Home Economics Education Association
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• v.34 no.3
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• pp.49-65
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• 2022

This study aims to examine the mutual influences of negative parenting attitudes, self-esteem, and life satisfaction perceived by adolescent children through longitudinal perspective. Data from the first to third years of the panel of the first year middle school students were used among the 2018 data of the Korean Children and Youth Panel Survey (KCYPS) of the Korea Youth Policy Institute. The longitudinal correlation was analyzed by applying the autoregressive cross-lagged model which can determine the direction of longitudinal causality between variables. As a result of the analysis, it was found that the negative parenting attitudes, self-esteem, and life satisfaction perceived by adolescents had a positive effect on the negative parenting attitude perception, self-esteem, and life satisfaction at later times, respectively. In addition, the higher the negative parenting attitude at the previous point was, the lower the self-esteem or life satisfaction afterward. The higher the life satisfaction, the lower the negative parenting attitude of the parents, and the higher the self-esteem. Recognition of negative parenting attitudes of parents lowered the self-esteem of adolescents, whereas the cross-delay coefficient from self-esteem to negative parenting attitude perception was not significant. Through these results, the longitudinal relationship between negative parenting attitude perception of adolescence, self-esteem, and life satisfaction was confirmed and efforts to form positive self-esteem and improve life satisfaction were discussed.

• Journal of Industrial Convergence
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• v.20 no.5
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• pp.21-28
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• 2022

Unlike previous studies, this study looked at the effect of the ideological tendencies of local government heads on the social welfare budget as a longitudinal study. This study was made possible by the election of the head of a progressive group in Gumi-si, a stronghold of conservatives, after the implementation of the local self-government system. Therefore, in this study, the change process of the political ideological orientation of Gumi-si's heads and the social welfare budget by year were listed and time-series analysis was conducted using actual cases of Gumi-si, Gyeongbuk for more than 12 years. As a result of the analysis, first, as in the cross-sectional analysis, in the longitudinal study, the change in the rate of increase in the social welfare budget according to the political ideological tendencies of the head of the local government showed a meaningful difference. Second, as in the previous cross-sectional analysis, the social welfare budget increased in the year before the election. Third, the same change in the growth rate as in the second did not appear at the end of the third elected term. All studies on the relationship between the political ideological tendencies of local government heads (including local councils) and the social welfare budget have been cross-sectional. However, this study has great implications in terms of the results of the first longitudinal cross-sectional analysis.

• Animal Systematics, Evolution and Diversity
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• v.26 no.3
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• pp.357-359
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• 2010

A stilt crab Crossotonotus spinipes (De Man, 1888) is newly reported from Korean waters as a result of continuous taxonomic studies on crabs. The present specimen has a row of tubercles and a longitudinal lobe with denticles on the dorsal border of the propodus of the chelipeds, and a shorter Pereopod 5. The description and illustration of this species are provided.

• Journal of Nutrition and Health
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• v.24 no.3
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• pp.219-229
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• 1991

The longitudinal changes on human milk volume per day and lactational performance of 23 Korean lacto-ovo-vegetarians(primiparae=11, multiparae=12) from 0.5 to 5 months after parturition have been studied by test weighing method. The human milk volume per day tended to increase during lactation. The mean volume (SD, ml/day) at 0.5, 1, 2, 3, 4, 5 months were 502(102), 692(127), 697(100), 684( 125), 757(52), 703(70), respectively. The overall mean volume was 661$\pm$132ml/day. The peak milk volume during the lactation was observed at most lactating women at the 1st month. The distributions of the individual mean volume during the first 5 months of lactation were found over 750m1(8.7% ), 650-750ml(47.9% ), 550-650m1(2l.7% ), and 450-550ml(2l.7% ) The number of feeding per day was 8.1 ($\pm$1.0) at 0.5 months postpartum, which was consistently decreased. However, the mean volume per feeding was increased from 62($\pm$9.5)ml at 0.5 month to 112($\pm$13.3)ml at 5 months postpartum. The milk volume was correlated with the peak volume. and maternal age. but not with weight before delivery. maternal height and birth weight. No differences of milk volume and lactational performance between facto-ovo-vegetarian and nonvegetarian women were observed. This study suggests that the human milk volume cited in the recommended dietary allowances for Koreitns is over estimated.

• The Journal of the Acoustical Society of Korea
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• v.19 no.6
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• pp.10-16
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• 2000

A new algorithm for estimating bladder volume for portable bladder volume measurement system is proposed. Given the actual image of a bladder, edges between bladder wall and urine are extracted first. Axes are calculated from these data and actual cross section shape is obtained by filtering. Since ordinary shape of a bladder is irregular, two cross-sections(transverse and longitudinal) are considered. With the area of a longitudinal cross-section projected along the axes of transverse cross-section, or vice versa, two estimated volume are obtained. Averaging these two value yields the volume of the bladder. Applied to actual experiments, the proposed algorithm showed explicitly good results in comparison with the conventional techniques.

• Korean Journal of Health Education and Promotion
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• v.33 no.5
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• pp.13-21
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• 2016

Objectives: The present study aims to examine associations between job demands and problem drinking, smoking, and practice of regular exercise among middle-aged and older male employees. Methods: Analyses were based on 239 employees aged 50+ and participated the 1st(2006) and the 4th(2012) waves of the Korean Longitudinal Study of Ageing(KLoSA). Panel logit regression analyses were performed to explore longitudinal associations between physical and cognitive job demands and the health behaviors when effects of demographic characteristics and objective job conditions were controlled. Results: Results suggested that first, workers who reported greater cognitive job demands were less likely to engage in problem drinking over the 6-year-period. Second, increased physical demands of the job were associated with greater odds of smoking, while physical demands predicted a reduced likelihood of practicing regular exercise. Conclusions: Results from the present analyses emphasize job demands could lead workers to problem health behaviors and suggest areas for health promotion efforts at the workplace that are sensitive to the needs of aging workers.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.16 no.1
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• pp.77-82
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• 2003

The ac loss is an important issue in the design of high-Tc superconducting power devices such as transformers and cables. In these devices many Bi-2223 tapes are closely stacked together and exposed to alternating magnetic fields that can have different orientations with respect to a tape. In such arrangement the magnetization loss is influenced by the screening current induced in adjacent tapes and thus different from that in a single tape. This stacking effect was experimentally investigated by measuring the magnetization loss in a stack, which consists of a number of tapes. First the magnetization loss in the single tape was measured in order to confirm the reliability of the loss data measured in the stack. The results for the single tape coincide well will the loss characteristics described in other previous works. For the stack In parallel and longitudinal magnetic fields the measured loss is Independent of both the number of tapes and stacking type. The longitudinal magnetization loss Is well explained rather by the slab model for decoupled filaments. For the tall stack in perpendicular field the measured loss at low fields is greatly decreased, compared to the loss of the single tape. However the loss at high fields is unaffected. These loss behaviors in the tall stack are well described by the slab model for full coupling.

• Steel and Composite Structures
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• v.19 no.6
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• pp.1381-1402
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• 2015

The application of composite steel-concrete slabs with profiled steel sheeting has increased, due to the various advantages in relation to reinforced concrete slabs such as, the reduced thickness, the reduced amount of lost formwork needed, as well as the speed of execution. The loss of longitudinal shear resistance is, generally, the governing design mode for simply supported spans of common lengths. For common distributed loadings, the composite behaviour is influenced by the partial shear connection between the concrete and the steel sheeting. The present research work is intended to contribute to improving the ultimate limit state behaviour of composite slabs using end anchorage. Eurocode 4, Part 1.1 (EN 1994-1-1) provides an analytical methodology for predicting the increase of longitudinal resistance, achieved by using shear studs welded through the steel sheeting as the end anchorage mechanism. The code does not supply an analytical methodology for other kinds of end anchorage so, additional tests or studies are needed to prove the effectiveness of these types of anchorage. The influence of end anchorage mechanisms provided by transverse rebars at the ends of simply supported composite slabs is analysed in this paper. Two experimental programmes were carried out, the first to determine the resistance provided by the new end anchorage mechanism and the second to analyse its influence on the behaviour of simply supported composite slabs.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.11a
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• pp.356-359
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• 2003

This paper deals with a flat type ultrasonic motor, which uses a longitudinal-bending multi mode vibrator of rectangular form. This ultrasonic motor was designed by combination of the first longitudinal and eighth bending mode, and the motor consisted of a straight aluminum alloy bar bonded with piezoelectric ceramic elements as a driving element. The geometrical dimensions of the rectangular aluminum vibrator were determined by Euler-Bernoulli theory In the experimental device, piezoelectric ceramics ( a piece of ceramic for the L-mode, $24\;{\times}\;8\;{\times}\;1[mm]$, and four pieces for the B-mode, $12.5\;{\times}\;8\;{\times}\;1[mm]$) were attached to one side of a aluminum plate($100\;{\times}\;8\;{\times}\;1[mm]$), and the stator was supported with a plastic case. As results, no-load rpm was 50[rev./m] when applied voltage was 150[Vrms] at the resonance frequency, and as the voltage was increased, the rpm was increased.

• Journal of the Korean Society of School Health
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• v.30 no.3
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• pp.274-283
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• 2017

Purpose: The purpose of this study was to investigate the mediating effects of self-esteem and self-resilience while identifying the relationship between bullying victimization (being bullied) and depression based on a longitudinal study design. Methods: Participants were adolescent cohort of 1,971 middle school students participating in 2013 and 2014 Korean Children and Youth Panel Survey conducted by National Youth Policy Institute. Data were analyzed by Pearson's Correlation and regression. Results: The major findings are as follows. First, self-esteem and self-resilience were positively related to each other and negatively related to depression and bullying victimization. Second, bullying victimization effected the level of depression of adolescents and self-esteem played a mediating role between bullying victimization and depression while self-resilience did not. Conclusion: The results suggest that emotional factors continue to play an important role in promoting psychological adjustment of victims of bullying. Therefore, interventions are more likely to be successful if they focus on emotional skills development of adolescents.