• Journal of the East Asian Society of Dietary Life
• /
• v.19 no.6
• /
• pp.839-845
• /
• 2009

The objective of this study was to examine the eating habit characteristic and developmental outcomes of young children (ages 24 months through 42 months) as well as their mothers' nutritional attitudes and maternal levels of nutrition knowledge. The study also analyzed relationships among the children's eating habits and developmental outcomes and the mothers' nutritional attitudes and nutrition knowledge levels. The subjects included 164 young children who were enrolled in early childhood education and care settings in Seoul and Gyunggi province. The main results were as follows. There were significant correlations among the young children's eating habits and developmental outcomes, specifically between their attitudes towards meals and fine motor skills, communication, social-emotional aspects, and cognitive areas (p<0.01). In addition, there were significant correlations among the young children's eating habits, the mothers' nutritional attitudes and their nutrition knowledge levels (p<0.01).

• The Korean Journal of Pain
• /
• v.2 no.1
• /
• pp.30-35
• /
• 1989

Two hundred patients with acute and chronic pain were treated with a low power laser and 115 patients among them were divided into several groups by their pathology and evaluated their response rate to the laser therapy was evaluated through follow-up study. 1) The ages of patients were between the early twenties and late sixties, and there was no differences between sexes. 2) Degenerative spondylosis and chronic lumbar sprain were the most common diseases among those patients. 3) The average duration of therapy was about 16 days and response to the therapy appeared from the fourth day of laser therapy. 4) Acute lumbar sprain and acute spinal compression fracture showed rapid response to laser therapy. 5) The spinal pathology group was the most common at 37.5% of cases and the response rate to laser therapy was the lowest at 58.7%. 6) The articular pathology group occupied 24.6% and the response rate was the highest at 81.3%. 7). The response rate of the posttraumatic and postsurgical pathology group was 76.5%. 8) The response rate of the tendinous and sports pathology group was 75%. 9) The response rate of the miscellaneous group was 66.7%. 10) The mean response rate of all patients was 71.6%.

• The Bulletin of The Korean Astronomical Society
• /
• v.38 no.1
• /
• pp.31.2-31.2
• /
• 2013

We use grid-based hydrodynamic simulations to study star formation in nuclear rings in barred galaxies. The gaseous medium is assumed to be infinitesimally thin, isothermal, and unmagnetized. To investigate various situations, we vary the total gas content in the bar regions and the bar growth time. We find that star formation rate (SFR) in a nuclear ring is determined by the mass inflow rate to the ring rather than the total gas mass in the ring. The SFR shows a strong primary burst and weak secondary bursts at early time, and declines to small values at late time. The primary burst is caused by the rapid gas infall to the ring due to the bar growth, with its duration and peak depending on the bar growth time. The secondary bursts result from re-infall of the ejected gas by star formation feedback of the primary burst. When the SFR is low, ages of young star clusters exhibit an azimuthal gradient along the ring since star formation takes place mostly near the contact points between the dust lanes and the nuclear ring. When the SFR is large, on the other hand, star formation is widely distributed throughout the whole length of the ring, with no apparent age gradient of star clusters. Regardless of SFR, star clusters have a positive radial age gradient, with younger clusters located closer to the ring, since the ring shrinks in size over time.

• Journal of the Korean Society of Costume
• /
• v.5
• /
• pp.83-101
• /
• 1981

This study is to research and analyse the Musicians' Costumes in Yi dynasty. Each costume for the musicians was, at that time, different in its design and style in accordance with what class the musicians were belonging to and what ceremony they were playing for, and the form and substance of them were changed according to the ages. In the early of Yi dynasty, the musicians wore their costumes imitated from the Song dynasty's. Especially in the 13th year of King Sae-Jong(1431), they divided the costumes into A-ag-Seo Jeon-ag Gwan-bog(雅樂署 典樂冠服) and Jeon-ag-Seo Gwan-bog(典樂署冠服). Meanwhile the musicians had to put on their different kinds of costumes according to the sorts of ceremonies they were playing for since January of the 16th year of king Sae-Jong(1434). It is widely known that confucianism was made a national policy in Yi dynasty. Compared the musicians' costumes for sacrificial rituals, however, with those for every kind of ceremony, one was simpler and shabbier without any strictly established forms than the other. At the same time, the musicians' costumes for ceremonies were, instead, designed in more gorgeous forms; it means that the sacrificial ritual was very lightly dealt at that time. It is very difficult to define, by standard pictures the whole style and form of the musicians' costumes in Yi dynasty in this study. Since we haven't shown any examples of the costumes, this attempt will be keepful.

• Korean Journal of Child Studies
• /
• v.33 no.1
• /
• pp.237-259
• /
• 2012

The purpose of this study is to examine how children perceived the use of intelligent service robots in early childhood education and identifying the characteristics of the interaction between the children concerned and the robots. The subjects of this study were 49 kindergarten students from Girin Kindergarten in Gyeonggi-do. The results of this study suggested that the children personalized the robot and recognized it as their friend, regardless of their ages. In the interactions between the children and the robot, the children engaged in physical contact with the robot and occasionally tried to control its functions. In the child-robot interaction, the children searched their favorite functions and used them repeatedly, but also lost interest in those repeated functions. Regardless of their interest levels, however, the attendance or portfolio organization functions. With regard to the interaction between peers, there were frequent quarrels regarding the use of the robot at first, but these conflicts were resolved by the intervention of peers or teachers, and the children who were familiar with the use of the robot helped their friends; this was viewed as constituting cooperative behavior. Children usually used the robot with their friends. The robot was a medium for children to find new friends. Peer group activities were explored and new friendships were created as a result of the use of the robot.

• Korean Journal of Child Studies
• /
• v.32 no.1
• /
• pp.157-172
• /
• 2011

The purpose of this study was to investigate the effect of childcare teachers' ego-resilience and directors, co-workers and family's social support to childcare teachers' burnout. The participants in this study were 326 childcare teachers from Daejeon metropolitan city and Chungnam province. They responded to the 'Maslach Burnout Inventory', 'Ego-resilience Scale', and 'Social Support Scale'. The collected data were analyzed by t-test, one-way ANOVA, Pearson's productive correlation, stepwise multiple regression, Duncan test for post hoc test, Cronbach's ${\alpha}$ for reliability, and factor analysis for validity by SPSS PC program (18.0 version). The results were as follows; first, there were significant differences in childcare teachers' burnout scores in relation to the educational levels of childcare teachers, their working hours, children's number per class, and the ages of the children they teach. Second, there were significant negative correlations (r = -.11~-.62) among childcare teachers' ego-resilience, directors, teaching colleagues and family's social supports, and their levels of burnout. Finally, childcare teachers' ego-resilience and teaching colleagues' levels of social support helped explain about 43% the childcare teachers' burnout total scores and about 17~39% of their sub-scores.

• Journal of the Korea Institute of Building Construction
• /
• v.2 no.4
• /
• pp.177-182
• /
• 2002

The purpose of this study is to develope the strength prediction model by Maturity Method. A maturity function is a mathematical expression to account for the combined effects of time and temperature on the strength development of a cementious mixture. The method of equivalent ages is to use Arrhenius equation which indicates the influence of curing temperature on the initial hydration ratio of cement. For the experimental factors of this study, we selected the concrete mixing of W/C ratio 45, 50, 55 and 60% and curing temperature 5, 10, 20 and $30^{\circ}C$. And we compare and evaluate with logistic model that is existing strength prediction model, because we have to verify adaption possibility of new strength prediction model which is proposed by maturity method. As the results, it is found that investigation of the activation energy that are used to calculate equivalent age is necessary, and new strength prediction model was proved to be more accurate in the strength prediction than logistic model in the early age. Moreover, the use of new model was more reasonable because it has low SSE and high decisive factor.

• Journal of the Korea Concrete Institute
• /
• v.11 no.3
• /
• pp.59-67
• /
• 1999

The mass concrete structures are generally constructed in an incremental manner by deviding the whole structures by a series of many blocks. The temperature and stress distributions of any specific block are continuously affected by the blocks placed before and after the specific block. For an accurate analysis of mass concrete structures, the sequence of all the blocks must be accordingly considered including the change of material properties with time for those blocks considered. The purpose of this study is to propose a realistic analysis method which can take into account not only the influence of the sequence, time interval and size of concrete block placement on the temperatures and stresses, but also the change of material properties with time. It is seen from this study that the conventional simplified analysis, which neglects material property changes of some blocks with time and does not consider the effect of adjacent blocks in the analysis, may yield large discrepancies in the temperature and stress distributions of mass concrete structures. This study gives a method to choose the minimum number of blocks required to obtain reasonably accurate results in analysis. The study provides a realistic method which can determine the appropriate size and time interval of block placement, and can be efficiently used in the design and construction of mass concrete structures.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2009.05b
• /
• pp.113-117
• /
• 2009

Fly ash (called FA hereafter) that results from thermal power plants is a long-term strength improving substance with reactivity to pozzolan and has been used for long. However, large amount of FA shows many advantages such as reduction of hydratio energy, long-term improvement in strength and economic feasibility and also has difficulties from reduction in initial strength and durability. In a preceding study, fine particle cement was applied to test the effects on initial strength. Therefore in this study, the effects of fine particle cement on the quality of FA concrete were reviewed. The results can be summarized as follows. Liquidity was increased by the most at FC substitution ratio of 15%. Air capacity was reduced according to increasing substitution ratio of FA and FC. Compressive strength showed high strength expression at all ages when FC was substituted at 45%. Synthesizing the above results, appropriate mixing of FC in FA concrete can improve liquidity, reduce unit quantity and show improvement in strength. In particular, mixed use of FC seems effective in improving early quality of concrete.

• Journal of the Korea Institute of Building Construction
• /
• v.3 no.4
• /
• pp.87-94
• /
• 2003

This study is to investigate the temperature hysteresis and development of compressive strength due to the curing conditions and to evaluate the optimum curing condition of test specimens showing the same development of strength to that of real structures in cold weather. The results of temperature curve with curing conditions in mock-up tests showed the trend of decrease plain concrete with insulation form, plain concrete with heating, concrete with accelerator for freeze protection, and control concrete in turn. The strength development of plain concrete of inside and outside of shelter showed the very slow strength gains due to early freezing, but that of concrete with accelerator for freeze protection showed the gradual increase of strength with time. From this, it is clear that accelerator for freeze protection has the effects of refusing the freezing temperature and accelerating the hardening under low temperature. Strength test results of small specimens embedded in members and located in insulation boxes at the site are similar to that of cores drilled from the members at the same ages, thus it is clear that these curing methods are effective for evaluating in-place concrete strength