• The Journal of Korean Association of Computer Education
• /
• v.20 no.2
• /
• pp.47-55
• /
• 2017

The purpose of this study is to investigate the predicting factors on the increase in computer entertainment behavior with the sample from KYPS data. The results of the Decision Tree model revealed that: (1) Neighbor supervision, self-belief, parent attachment, life satisfaction, and peer attachment were significant for the increase in computer entertainment behavior. (2) Neighbor supervision, class participation and leisure satisfaction were significant for male students' increase in computer entertainment behavior. (3) Optimistic disposition, teacher attachment, and peer attachment were significant for female students' increase in computer entertainment behavior. These results suggest that meaningful factors and their divers interactions should be considered in methods and programs for regulating and preventing the increase in computer entertainment behavior.

• Journal of Korean Home Economics Education Association
• /
• v.18 no.2 s.40
• /
• pp.151-162
• /
• 2006

The purpose of this study was to investigate the effects of family environment and individual psychological variables on adolescent's problem behaviors. The subjects of this study were 855 students of middle school who reside in Seoul and 791 self-reported questionnaires were used for final analysis. The major results of this study were as follows: First, gender differences in adolescent's problem behaviors were not found. Second, depression, mother's monitoring and father's parenting behavior were found to have effects on adolescents' problem behaviors. Particularly, male adolescents' problem behaviors were influenced by depression and father's parenting behavior. Female adolescents' problem behaviors were influenced by depression, father's monitoring, and mother's monitoring.

• International Journal of Industrial Entomology and Biomaterials
• /
• v.9 no.2
• /
• pp.199-205
• /
• 2004

With the main objective to know the feasibility of exploitation of F$_1$ hybrids in semi arid and arid climatic conditions of India, the present study was carried out by utilising RD$_1$ as female parent and six bivoltine silkworm breeds viz., CSR$_2$, CSR$_4$, CSR$_{5}$, CSR$_{17}$, CSR$_{18}$ and CSR$_{19}$ along with NB$_4$D$_2$ as male parents. Different hybrids exhibited their superiority for various economic characters during different seasons. Among F$_1$ hybrids, RD$_1$${\times}$CSR$_{5}$ was adjudicated as the best hybrid in terms of expression of significant positive hybrid vigour over mid parental value for five economic characters namely hatching %, cocoon yield, cocoon weight, cocoon shell weight and filament size, highest multiple trait average evaluation index value of 56.77 and comparatively uniform cocoon size with coefficient of variation (CV%) of 3.80 and Standard Deviation (SD) of 7.99 during September - October 2003. Results of the present study revealed that the F$_1$ hybrid RD$_1$${\times}$CSR$_{5}$ can be successfully exploited on commercial in semi arid and arid climatic conditions in India. India.dia.

• Korean journal of food and cookery science
• /
• v.30 no.6
• /
• pp.687-694
• /
• 2014

The purpose of this study was to investigate the salt-related dietary behaviors according to the stage of change model in middle school students from the Gyeongsangbuk-do area. Data were collected from, a total of 253 male and 210 female middle school students through. Self-reporting questionnaire. By stage of salt-related dietary behaviors, the 'Pre-contemplation stage' was comprised of 57.3%, the 'Contemplation stage' of 12.2%, the 'Preparation stage' of 7.4% and the 'Action stage' of 23.2% of students. There were significant differences in the stage of change according to the experience with salt-related nutrition education (p<0.05), wherein differences according to gender and parent's education were not observed. In the salt-related dietary behaviors, there were significant differences according to gender (p<0.05), pocket money (p<0.01), and the stage of change (p<0.001). Males had higher salt-related dietary behavior scores than females, while students who had more pocket money also had higher scores, and the action group had lower scores than the other groups. Among the 10 items of salt-related dietary behaviors, only 4 showed above the average score (2.92/5.00), including behaviors of liking kimchi, completely consuming snacks and instant foods, and drinking the broth of soups. The salt-related dietary score of males was higher than females, while the action group's score was lower than the other stages.

• Korean Journal of Breeding Science
• /
• v.43 no.6
• /
• pp.616-619
• /
• 2011

'Dayu', a perilla (Perilla frutescens (L.) Britton) cultivar for edible seed was developed by Department of Functional Crop, NICS, RDA in 2004. It was developed from a cross between a pedigree of Daeyeop as a female and YCPL1846 as a male parent in 1994. 'Dayu' could be characterized by white flower color and brown grain color. Dayu shows 127 cm in plant height, and has lodging tolerance. Maturing date of 'Dayu' was October 6, which was similar with that of 'Saeyeopsil'. This new cultivar has high oil content with 48.5% and high linolenic acid in the fatty acid composition. The grain yield potential of 'Dayu' is about 1.44 MT/ha in the regional yield trial.

• Journal of Biomedical and Translational Research
• /
• v.19 no.4
• /
• pp.130-139
• /
• 2018

This study aimed to analyze a high-performance liquid chromatography (HPLC) separation using a pentafluorophenyl column of parent drug hydroxychloroquine (HCQ) and its active metabolite, desethylhydroxchloroquine (DHCQ) applying to determine bioequivalence of two different formulations administered to patients. A rapid, simple, sensitive and specific liquid chromatography-tandem mass spectrometry (LC-MS/MS) method has been developed and validated for bioanalysis of HCQ and its metabolite DHCQ in human whole blood using deuterium derivative $hydroxychloroquine-D_4$ as an internal standard (IS). A triple-quadrupole mass spectrometer was operated using electrospray ionization in multiple reaction monitoring (MRM) mode. Sample preparation involves a two-step precipitation of protein techniques. The removed protein blood samples were chromatographed on a pentafluorophenyl (PFP) column ($50mm{\times}4.6mm$, $2.6{\mu}m$) with a mobile phase (ammonium formate solution containing dilute formic acid) in an isocratic mode at a flow rate of 0.45 mL/min. The standard curves were found to be linear in the range of 2 - 500 ng/mL for HCQ; 2 - 2,000 ng/mL for DHCQ in spite of lacking a highly sensitive MS spectrometry system. Results of intra- and inter-day precision and accuracy were within acceptable limits. A run time of 2.2 min for HCQ and 2.03 min for DHCQ in blood sample facilitated the analysis of more than 300 human whole blood samples per day. Taken together, we concluded that the assay developed herein represents a highly qualified technology for the quantification of HCQ in human whole blood for a parallel design bioequivalence study in a healthy male.

• Journal of Digital Convergence
• /
• v.16 no.11
• /
• pp.561-569
• /
• 2018

The aim of this study was to examine the association between daily stress and smartphone overdependence among multicultural adolescents, focusing on the moderating roles of gender and age. This study performed a series of multiple linear regressions with a sample of 794 multicultural adolescents living with a foreign-born parent or parents from the 13th Korea Youth Risk Behavior Web-Based Survey. The main regression analysis showed that daily stress was associated with higher levels of smartphone overdependence among multicultural adolescents. In addition, interaction analyses showed that the association between daily stress and smartphone overdependence was more pronounced for male adolescents compared to female adolescents, and for middle school students compared to high school students. This study concluded with some suggestions to address smartphone overdependence among multicultural adolescents.

• Korean Journal of Agricultural Science
• /
• v.50 no.4
• /
• pp.941-952
• /
• 2023

The metabolites of agrichemicals, such as organophosphorus pesticides, are known to be more hazardous than their parent pesticides. 3,5,6-trichloro-2-pyridinol (TCP) is a major degradation product of chlorpyrifos, one of the organophosphate insecticides widely used in agriculture. In vivo or in vitro exposure to chlorpyrifos has been known to interfere with male reproductive functions, leading to reduced fertility in mammals. Therefore, this study was performed to examine the changes in the fertilization competence of boar spermatozoa exposed to TCP. Sperm samples were subjected to varying concentrations of TCP (10, 50, 100, 200 µM) and different periods of incubation. Sperm motility, motion kinematics, viability, acrosome integrity, intracellular reactive oxygen species (ROS) production, and gene expression levels (ODf2, ZPBP2, AKAP3 and AKAP4) were evaluated after exposure of the sperm to TCP. A significant dose-dependent reduction in motility was observed in sperm samples incubated with TCP compared to the controls after both incubation periods. Sperm viability was significantly decreased in samples incubated with 50, 100, and 200 µM TCP in both incubation periods. A significantly lower percentage of normal acrosomes and gene expression levels were observed in sperm samples exposed to 50, 100, and 200 µM TCP after both incubation periods, compared to the controls. There was a significant increase in the ROS production in spermatozoa incubated with 100 - 200 µM TCP after both incubation periods. Consequently, the direct exposure of boar spermatozoa to TCP interferes with sperm functions and leads to decreased fertilization. In order to identify and address the various causes of reproductive decline, the impact of chemical metabolites needs to be discussed in depth.

• The Korean Journal of Food And Nutrition
• /
• v.24 no.3
• /
• pp.312-319
• /
• 2011

We investigated the eating habits and food preferences of middle school students to provide material for establishing dietary and nutritional education at the elementary level. We questioned 270 male and female students attending certain middle schools in the Daegu area about their eating habits and food preferences. Eating habits were found to be most regular for students in families where only one parent worked and irregular for students in families where both parents worked. There was a positive correlation between a higher level of academic education of the father and the frequency of consumption of instant foods. There was also a positive correlation between a higher level of academic education of the mother and the frequency of snack consumption. Male students had a higher preference for consuming animal foods than did female students. Students that lived in extended families tented to have a higher preference for vegetable foods. On the other hand, students that lived in nuclear families and students that lived in families where both parents worked preferred snacks more. Based on these results, parental employment and academic education level influences the eating habits and food preferences of middle school students.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
• /
• v.14 no.2
• /
• pp.229-237
• /
• 2003

Objectives：Among the studies related to excessive computer use, the studies for elementary school students are relatively rare. Because children have relatively poor ability to recognize and express themselves, the carers' information is important to assess the children. This study attempted to investigate the relationship between children's computer use and sociopsychiatric characteristics on the basis of carers' reports. Methods：The subjects of this study were 287 5th- and 6th-grade students in the elementary school in Seoul. The student carers were asked to answer the questions for children's computer use, the computer addiction test modified from Young's parent-child internet addiction test, Korean Personality Inventory for Children(K-PIC). SPSS(version 10) was used to analyse the differnece of computer use between genders and the relation of the computer addiction test with K-PIC. Results：1) The score of computer addiction test was significantly higher in male children than in female children and more male children compared to female children were distributed in the excessive user group. 2) The score of computer addiction test correlated with the scores of most clinical scales of K-PIC and the average scores of most clinical scale were significantly higher in the excessive user group than in the general user group. 3) More children with score above 65 in HPR, DLQ, FAM scale were distributed in excessive user group than in general user group. Conclusion：The 5th- and 6th-grade elementary school students with excessive computer use were found to show more sociopsychiatric problems. With these finding we suggest that social and clinical attention to the children who use computer excessively shoud be required.