• Food Science of Animal Resources
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• v.21 no.4
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• pp.329-336
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• 2001

The experiments were carried out to investigate the aging effect between loin muscles from Hanwoo and Helstein. Two kinds of loin samples were prepared from the carcasses of grade B2 from Hanwoo and D from Holstein. The carcasses were chilled for 24 hours after slaughter. The carcasses was obtained by chilling the loin fort 1 day after wrapping it. On the other hand. was obtained divided by 500g and stored at 2$^{\circ}C$ for 11 days after air packing. In the case of fresh beef pH and lactic acid of grade B2 were lower than that of grade D. Hardness and chewiness of grade B2 were lower than that of grade D, but myofibrillar fragmentation index(MFI) of glade B2 were higher than that of grade D. Total concentrations of free amino acid of grade B2 were higher than those of D. The contents of monounsaturated fatty acid of grade B2 was lower than grade D, and monosaturated fatty acid/saturated fatty acid(MUFA/SFA) of grade B2 were higher than grade D. The contents of nonprotein nitrogen of the aged beef was higher than the fresh beef, and beef of grade B2 was higher than that of grade D. In case of aging beef. cooking loss of grade B2 was lower than grade D.

• The Journal of Korean Society for School & Community Health Education
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• v.8 no.1
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• pp.55-68
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• 2007

Objectives: This study was conducted to describe child perceived health knowledge, health education needs, and health behaviors by grade in a representative general characteristic and examined their associations for students' better health behaviors. Methods: The survey participants were 410 fourth to sixth grade students in two elementary schools in Seoul, Korea. A total of 12 classes in two elementary schools were randomly selected and all students of the selected classes participated in the self-administered survey. The questionnaire contained the items of perceived health knowledge, health education needs(health topics which they want to know more), health behavior, and general characteristics. Results: Perceived health knowledge, health education needs, and health behaviors were, generally, better in the $4^{th}$ grade students than $5^{th}$ or $6^{th}$ grade students. That is, higher grade students had lower perceived health knowledge, lower health education needs, and lower health behavior status. Specifically, there was significant grade differences in 'significance of publichealth,' 'nutritionandhealthyeating,' 'desirablehealthhabits,' 'humansex,' 'physical development in childhood,' 'stress management & drugcontrol,' and 'injury prevention.' Correlations between perceived health knowledge and health behavior were low or medium in all grades. However, correlations between perceived health education needs and health were significant in the $4^{th}$ grade students but not significant in the $5^{th}$ and $6^{th}$ grade students. Conclusions: There was significant grade difference of the relationship between health knowledge, health education needs, and health behaviors among children. In general, the lower the grade the better the health knowledge, educational needs, and health behavior. Health education needs were more significant by grade than perceived health knowledge and health behaviors.

• Korean Journal of Child Studies
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• v.30 no.3
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• pp.37-53
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• 2009

This study researched aspects of gender and grade related to the after-school happiness of lower grade elementary students and the correlation between the children's happiness and their stress and playfulness. Results of surveys and interviews of 124 lower grade elementary students who attended 4 after-school programs in Seoul showed that : (1) there were no gender differences in happiness but first graders were the happiest, then 2nd graders and the 3rd graders who were the least happy. (2) Children's happiness correlated negatively with stress. (3) There was no relationship between children's overall happiness and playfulness, but there was a negative correlation between happiness and playfulness under the sub-category of cognitive spontaneity. Results were discussed in relation to the Korean socio-cultural environment.

• Journal of Life Science
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• v.7 no.4
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• pp.336-341
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• 1997

This study was conducted to investigate the effects of carcass grade on the hardness, myofibrillar fragmentations index, protein extractability and Mg-ATPase activity of myofibril and actomyosin obtained from 1, 2, 3 and D carcass grade)subgrade) in Korean native cow. Proximate component, hardness, chewiness, myofibril fragmentation index, protein extractability and Mg-ATPase activity if myofibril or actomyosin were not significantly different between 1st and 2nd carcass grade loin. The hardness and chewiness of 2nd carcass grade loin's were significantly lower than 3th grade loin's, but the myofibril fragmentation index, sarcoplasmic protein extractability and Mg-ATPase activity of myofibril were higher. The myofibrillar protein extractability and Mg-ATPase activity of actomyosin obtained from 3th carcase grade loin's were significantly higher than D grade loin's, but the hardness, chewiness and stroma protein extractability were lower. In conclusion, the degree of toughness in Korean native cow's loin was not significantly different between 1st and 2nd grade, but 3rd and D carcass grade were significantly higher, regardless of before and after aging.

• Journal of the Korean School Mathematics Society
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• v.10 no.4
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• pp.415-435
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• 2007

A transition from elementary to secondary school, and among grades, among learning contents is a essential problem in education. A connectivity between learning contents is important in student's growth and development. A gap between lower grades and higher grades in elementary school is no less extensive than a gap between elementary mathematics and secondary mathematics. In this paper, we start with a critical mind about a transition and connectivity between lower grades and higher grades in elementary school. In order to compare between elementary grades, we firstly focus 4th grade mathematics which finish lower grades and start higher grades at the same time. First, we make up a questionnaire to 4th grade students and teachers in charge 4th grade. A questionnaire is composed of questions about the degree of difficulty in the learning(and teaching) of 4th grade mathematics comparing with 3rd grade mathematics. Second, we compare to lower grades lessons(1st grade) and 4th grade lessons using a qualitative method. we analyze the lesson contents, activities and time through 'analysis of the learning course'. And we compare the pattern of eliciting questions, question patterns, nomination patterns and feedback patterns between 1st grade and 4th grade lessons. We hope that this paper is a fundamental sources in investigating a connectivity between lower grades and higher grades in elementary mathematics in the future.

• The Journal of the Korea Contents Association
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• v.13 no.12
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• pp.463-469
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• 2013

In this study, I examine whether differences in the levels of stress exist with regard to the police department size. To accomplish this, a way ANOVA analysis of variance(One-way ANOVA) was conducted. As a result, a significant difference was found in Job stress and traumatic stress according to the department size and grade. Specifically, first, in the job stress level on the department size, the smaller department size was, the higher job stress level was and the bigger department size was, the lower job stress level was. Second, in the traumatic stress level on the department size, the smaller department size was, the higher traumatic stress level was and the bigger department size was, the lower traumatic stress level was. Third, in the job stress level on the department grade, the lower department grade was, the lower job stress level was and the higher department grade was, the higher job stress level was. Fourth, in the traumatic stress level on the department grade, the lower department grade was, the lower traumatic stress level was and the higher department grade was, the higher traumatic stress level was.

• Journal of the Korean Society of Food Culture
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• v.29 no.2
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• pp.222-230
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• 2014

This study was conducted to investigate the effects of 10-week dietary education on elementary students in an after-school program in Seoul. Participants were 20 1-2 grade students and 283-6 grade students, and the dietary program consisted of dietary education and activities focused on children's levels of understanding. The results were as follows: Total participant's food habit scores and nutrition knowledge significantly increased (p<0.05) after dietary education. Food habit and nutrition knowledge scores of lower grade participants (grade) increased desirably (p<0.05). Meanwhile higher grade participants' (grade) food habit scores also changed (p<0.05), but their nutrition knowledge scores were changed. Boy's food habit scores significantly changed (p<0.05), whereas girl's food habit scores did not change significantly. Further, female participants' nutrition knowledge scores did not changesignificantly after education. Participants' obesity knowledge scores significantly changed after the education (p<0.05), but their attitudes on obesity increased insignificantly. Lower grade participants' attitudes on obesity significantly and desirably changed (p<0.05), whereas higher grade participants' attitudes on obesity changed insignificantly. Girl's knowledge and attitudes on obesity significantly and desirably changed (p<0.05-0.01). This study revealed the correlation between food habit scores and attitudes on obesity (p<0.01), demonstrating that participants with high food habit scores have advisable attitudes on obesity. The result of this study shows that lower grade participants' food habit scores, nutrition knowledge, and attitudes on obesity changed desirably after dietary education. Therefore, this study promote the development of adequate nutrition education and materials focused on lower grade students and the need for systematic and continuous dietary education programs based on elementary school.

• Journal of Families and Better Life
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• v.19 no.5
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• pp.221-238
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• 2001

The purpose of this study was to investigate the relationships between parental childreating behaviors and parental personality, and children’s emotional intelligence. The subjects included 223 children from kindergarten to 6th grade and their parents. The results were as follows: Firstly, children’s Emotional Intelligence(EI) showed sex difference and age difference between two grade-groups(kindergarten~3rd grade, 4th~6th grade). the age-differences being more distinct in other-related EI than in the self-related : Secondly, parental personality explained parental childrearing behaviors better in higher-grade groups than in lower-grade groups, maternal personality predicting maternal childreating behaviors better than paternal personality predicting the paternal childreaing behaviors; Thirdly, childrearing behaviors explained childern’s self-relate EI better than the other-related : Finally, parental personality revealed greater predictive power of children’s EI in higher-grade groups than in lower-grade groups, better explaining sel-related EI than the other-related. Several suggestions were made concerning future EI studies.

• Korean Journal of Applied Biomechanics
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• v.15 no.4
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• pp.117-129
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• 2005

The purpose of this study was to characterize the impact shock wave and its attenuation, and the kinematic response of the lower extremity's joints to the impact shock during downhill running in which the lower extremity's extensor acts dominantly. For this study, fifteen subjects(mean age:$27.08{\pm}4.39$; mass:$76.30{\pm}6.60$; height:$177.25{\pm}4.11$) were required to run on the 0% grade treadmill and downhill grades of 7%, and 15% in random at speed of their preference. When the participant run, acceleration at the tibia and the sacrum and kinematic data of the lower extremity were collected for 20s so as to provide at least 5 strides for analysis at each grade. Peak impact accelerations were used to calculate shock attenuation between the tibia and sacrum in time domain at each grade. Fast Fourier transformation(FFT) and power spectral density(PSD) techniques were used to analyze impact shock factors and its attenuation in the frequency domain. Joint coordinate system technique was used to compute angular displacement of the ankle and knee joint in three dimension. The conclusions were drawn as fellows: 1. Peak impact accelerations of the tibia and sacrum in downhill run were greater than that of 0% grade run, but no significant between conditions. Peak shock of PSD resembled also in pattern of peak impact acceleration. The wave of impact shock attenuation between the tibia and sacrum decreased with increasing grade, but didn't find a significant difference between grade conditions. 2. Adduction/abduction, flexion/extention, and internal/external rotation of the ankle and knee joints at support phase between grade conditions didn't make much difference. 3. At grade of 7% and 15%, there were relationship between the knee of the flexion/extension movement and peak impact acceleration during heel strike and found also it in the ankle of plantar/dorsiflexion at grade of 15%.

• Human Ecology Research
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• v.54 no.5
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• pp.475-485
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• 2016

This study explored mothers' and grandmothers' perception regarding child rearing practices as overprotective behaviors for first to third grade levels of elementary school. The study was conducted on 202 mothers and grandmothers of first to third grade elementary school students. Questionnaires were made with 40 questions on overprotection behaviors selected from the existing questions for preschooler, high grade elementary students, and youth. The questionnaires were distributed to target subjects to answer how they would perceive when each of question is applied to their lower grade elementary students. Based on the collected responses and the factor analysis, it was found out that the overprotective behaviors were classified into four factors such as "reduction in independence," "over-sensitiveness to safety," "interference in daily life," and "health anxiety." There were significant differences in the perception of the overprotective behavior by the subjects depending on the generations, features of children and mothers. This study focused on the lower grade elementary school students who have been removed from studies due to the lack of intervention measures. It has the implication in that the findings of the study can give the basic data for the development of the scale on overprotective behaviors in lower grade elementary school students.