• Child Health Nursing Research
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• v.24 no.1
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• pp.58-67
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• 2018

Purpose: This prospective study aimed to examine the development of premature infants at 12 and 24 months and to explore the factors related to their development. Methods: Of the 80 premature infants who were recruited, 52 participants at 12 months and 31 participants at 24 months were included in this study. The development of the infants was examined using the Korean Bayley scale of infant development-II. Postnatal depression, husband's support, social support, mother-infant attachment, and the home environment were assessed using self-report questionnaires completed by the mothers and through the researcher's observations. Results: There was significant difference between normal and delay group at psychomotor development at 12 months depending on social support at 6 months (t=2.03, p=.049). Mother-infant attachment at 6 months (r=.71, p<.001), 12 months (r=.37, p=.043), and 24 months (r=.40, p=.026), as well as social support (r=.38, p=.034) and the home environment (r=.41, p=.022) at 24 months, were correlated to mental development at 24 months. There was a significant positive correlation between mother-infant attachment at 6 months and psychomotor development at 24 months (r=.40, p=.046). Conclusion: To reduce the risk of developmental delay and to promote healthy development in premature infants, early nursing interventions targeting mother-infant attachment, the home environment, and the mother's social support structure are needed.

• Korean Institute of Interior Design Journal
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• v.21 no.1
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• pp.11-19
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• 2012

The purpose of this study is to categorize elderly people's behavior using the questionnaire filling up by oneself for 24hours and to analyze the time required according to behavior and space. Also, through analytical researches, we find a way to develop smart home service. In this study, we carry out a questionnaire targeting a number of 20 elderly people. The questionnaire is to survey elderly people's behaviors for 24hours. Questionnaire items consist of three parts : items for checking time required about a daily behavior, items for analyzing a space in daily lives, generalities. This study is analyzed through descriptive statistics. The results of this study were as follows. Firstly, the elderly people's behaviors were eight categories. Among these behavior's categories, the highest portion is the behavior related to Individual maintenance such as sleep, personal hygiene, nap, etc. by 49%. Secondly, the portion of time required in residence based on daily lives is higher than outside of residence by 73%. Lastly, analyzing each space in residence focused on time required of elderly people's behaviors, bed room is the highest portion by 49%, and followed by living room with 29% and kitchen with 15%, and bath room with 7%.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.3 no.2
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• pp.90-93
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• 1998

Cultured isolates of Prorocentrum minimum, P. micans, P. triestinum, P. balticum, Gymnodinium sanguineum, Alexandrium catenella, Scrippsiella trochoidea, and Heterosigma akashiwo from red tides in southern coast of Korea were phylogenetically compared on the basis of their 24S rRNA genes. For each isolate approximately 700 bp of 24S rDNA, encompassing D1 and D2 hypervariable domains, was amplified using the polymerase chain reaction and sequenced. The sequences were aligned with those reported in Genbank by using ClustalW program and phylogenetic tree was generated to show that morphospecies designations in the Alexandrium and Prorocentrum species are congruent with terminal taxa defined by phylogenetic analysis of the 24S rRNA fragment. Our results suggest that the molecular phylogeny approach could facilitate identification of domestic dinoflagellates which have ambiguous morphologies.

• Journal of Animal Science and Technology
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• v.44 no.2
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• pp.233-238
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• 2002

Meat quality of the domestic pork loins(n=537) classified by 3 groups(5.31-5.50, 5.51-5.70 and $\geq$5.71) according to pH at 24hr post-mortem(pH24) was investigated. In proximate chemical compositions, protein was highest and fat was lowest in the pork loins of pH24 5.31-5.50 group. Water holding capacity increased as pH24 increased, whereas purge loss and cooking loss decreased as pH24 increased. Meat color values(CIE L*, a*, b*, Chroma, Hue and $\Delta$E) decreased as $pH_{24}$ increased. In texture traits, hardness and chewiness were lowest and fat hardness was highest in the pork loins of $pH_{24}{\geq}$5.71 group when compared to the other $pH_{24}$ groups. However, Warner-Bratzler Shear force, springiness and cohesiveness were not significantly different among the pH24 groups(P>0.05). In sensory properties, juiciness and tenderness were highest in $pH_{24}{\geq}$5.71 group. From the results of this study, pork quality was highly related to $pH_{24}$. Therefore, the factors affecting the post-mortem pH, such as stress before slaughter, slaughtering methods, and cooling condition slaughter must be properly controlled and improved to produce high quality pork.

• Journal of Microbiology and Biotechnology
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• v.17 no.3
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• pp.420-427
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• 2007

We investigated the temperature effects on the virulence, development, reproduction, and otility of two Korean isolates of entomopathogenic nematodes, Steinernema glaseri Dongrae strain and S. longicaudum Nonsan strain. In addition, we studied the growth and virulence of their respective symbiotic bacterium, Xenorhabdus poinarii for S. glaseri and Xenorhabdus sp. for S. longicaudum, in an insect host at different temperatures. Insects infected with the nematode-bacterium complex or the symbiotic bacterium was placed at $13^{\circ}C,\;18^{\circ}C,\;24^{\circ}C,\;30^{\circ}C,\;or\;35^{\circ}C$ in the dark and the various parameters were monitored. Both nematode species caused mortality at all temperatures tested, with higher mortalities occurring at temperatures between $24^{\circ}C\;and\;30^{\circ}C$. However, S. longicaudum was better adapted to cold temperatures and caused higher mortality at $18^{\circ}C$ than S. glaseri. Both nematode species developed to adult at all temperatures, but no progeny production occurred at $13^{\circ}C\;or\;35^{\circ}C$. For S. glaseri, nematode progeny production was best at inocula levels above 20 infective juveniles/host at $24^{\circ}C\;and\;30^{\circ}C$, but for S. longicaudum, progeny production was generally better at $24^{\circ}C$. Steinernema glaseri showed the greatest motility at $30^{\circ}C$, whereas S. longicaudum showed good motility at $24^{\circ}C\;and\;30^{\circ}C$. Both bacterial species grew at all tested temperatures, but Xenorhabdus sp. was more virulent at low temperatures $(13^{\circ}C\;and\;18^{\circ}C)$ than X. poinarii.

• Journal of the Korea Convergence Society
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• v.9 no.12
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• pp.189-194
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• 2018

This study is 24 person emergency brake for the structural analysis are described. Recently emerged as a key point of the elevator safety and increase the need for an emergency brake was developed accordingly to ensure the safety of the brake tool for 3D design using Solid Works. ANSYS utilizes 24 person emergency break finite element model for total deformation, strain and stress were obtained.

• Bulletin of the Korean Chemical Society
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• v.24 no.3
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• pp.397-399
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• 2003

• Bulletin of the Korean Chemical Society
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• v.24 no.12
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• pp.1859-1861
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• 2003

• Proceedings of the KIEE Conference
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• 2006.10a
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• pp.55-56
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• 2006

We investigated the diffraction grating efficiency by the DPSS laser beam wavelength to improve the diffraction efficiency on AsGeSeS & Ag/ AsGeSeS thin film. Diffraction efficiency was obtained from DPSS(532nm)(P:P)polarized laser beam on AsGeSeS, Ag/ AsGeSeS and AsGeSeS/Ag/AsGeSeS thin films. As a result, for the laser beam intensity, 0.24 mW, single AsGeSeS thin film shows the highest value of 0.161% diffraction efficiency at 300 s and for 2.4 mW, it was recorded with the fastest speed of 50 s, which the diffraction grating forming speed is faster than that of 0.24 mW beam. Ag/ AsGeSeS and AsGeSeS/ Ag/ AsGeSeS multi-layered thin film also show the faster grating forming speed at 2.4 mW and higher value of diffraction efficiency at 0.24 mW.

• Korean Journal of Mathematics
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• v.24 no.1
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• pp.1-13
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• 2016

This paper shows that the solutions to the perturbed functional dierential system $$y^{\prime}=f(t,y)+{\int_{t_0}^{t}}g(s,y(s),Ty(s))ds$$ have uniformly Lipschitz stability and asymptotic property. To sRhow these properties, we impose conditions on the perturbed part ${\int_{t_0}^{t}}g(s,y(s),Ty(s))ds$ and the fundamental matrix of the unperturbed system $y^{\prime}=f(t,y)$.