• International Journal of Industrial Entomology and Biomaterials
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• v.42 no.2
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• pp.33-45
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• 2021

Many researchers are using the heterosis, heterobeltiosis and hybrid vigour over check parent value formulae to determine the hybrid vigour for animals, plants and silkworm breeding. These formulae are ideal for determine the hybrid vigour for the positive direction of single trait. It is difficult using these formulae for multiple traits. Suggested modification for cardinal formulae were made as well as suggestion new formula for determines hybrid vigour for multiple traits. Modifications of hybrid vigour were made to facilitate judgment of best hybrids under study for multiple traits. Nineteen local hybrids of mulberry silkworm were prepared for these investigations in addition the imported Bulgarian hybrid. Comparison between the cardinal and the modifications formulae were applied for thirteen economic characters. Nine positive and four negative direction characters were observed. Modified formulae make the judgment of heterobeltiosis, heterosis and hybrid vigour over check parent value very facilitate for positive and negative traits.

• Journal of Sericultural and Entomological Science
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• v.42 no.1
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• pp.24-27
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• 2000

A new silkworm variety 'Yangwonjam'for both of spring and autumn rearing season is F$_1$hybrid between Jam 143, a Japanese race bred from H5R1/P8503 and Jam 144, a Chinese race from M8312/8190. This is the first both parent sex-limited larval marking variety in Korea, and which contributes to eggs production of F$_1$hybrid silkworm with saving labor. Jam 143, Japanese parent of the 'Yangwonjam'showed high GCA in pupation percentage and Jam 144, Chinese parent showed high GCA in pupation percentage and single cocoon weight. In the local adaptability test performed at 8 local areas in spring of 1998, Yangwonjam records 1% higher in pupation percentage and 5%, 4% lower in single cocoon weight, cocoon yield from 10,000 3rd molted larvae respectively than the check variety Kumokjam. Also in the resistance test against unfavorable rearing condition performed in spring of 1997, Yangwonjam records 9%, 14% lower in single cocoon weight, cocoon shell weight respectively than the check variety, but showed 1% higher in pupation percentage than check variety.

• Journal of the Korea Society of Computer and Information
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• v.22 no.5
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• pp.89-95
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• 2017

This study examines the effect of smartphone to adolescent's mental health and defines moderating effect of parent-child relationship. For this purpose, 278 subjects were surveyed from 1 middle schools in Gwangju and Jeonnam area. The result of this study are as follows. First, when verifying the impact of smartphone addiction on their mental health, The smartphone addiction was found as the key variable that has a negative impact on mental health. The results indicated that adolescents with higher levels of smartphone addiction more likely to have lower levels of mental health. Second, impact of parent-child relationship on their mental health was analyzed. The analytic results suggest that parent-child relationship has a impact on their mental health. In other words, higher parent-child relationship means higher mental health. Third, the moderating effect of parent-child relationship was analyzed. The parent-child relationship check the moderating effect of do smartphone addiction on their mental health. The implications for social work practice were also discussed.

• Journal of the Korean Home Economics Association
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• v.46 no.5
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• pp.35-61
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• 2008

This study aimed at developing parent education program for family leisure for parents of adolescent children to enable them to pursue happy lives as healthy families with adequate balance of cohesiveness and adaptability and smooth communication between the members of their families after parent education for family leisure. Research procedure of parent education program for family leisure proceeded with establishment of theory and requirement survey through precedent research, design of program, practice of program, evaluation of program and suggestion of revised program model after evaluation. On the basis of evaluation results, parent education program for family leisure aiming at parents of adolescent children can conclusively be revised as follows. The first session aims at understanding of family leisure; the second session aims at improvement of learning effect through education & experience-oriented activities; the third session aims at understanding and paying regard to their children through hobby-oriented activities; the fourth session aims at improvement of social relations through society-oriented activities; the fifth session aims at helping children education through check of communication in family-oriented activities and home-visiting education for etiquette; and the sixth session, the final session, aims at providing information and knowledge on family leisure and letting them gain better understanding of adolescent children.

• Korean Journal of Child Studies
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• v.25 no.6
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• pp.15-34
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• 2004

This study is an attempt to develop the 'Parental Intelligence Scale', which can be applied in the parent education and counselling and provide more useful information for more appropriate interventions by evaluating the characteristics of parent's roles and strong/weak points of the parent's roles under the special situation and environments. In developing the scales, this study reviews of numbers of existing literatures, analysis of scales and tools on parent's role or attitude, collection of episodes on parent's role, validity check processes by field experts, and 2 rounds of factor analysis. The outcomes of the study are as follows; In regard of the development of Parental Intelligence Scale, 3 factors of care-giving role, management role, nurturing role were derived from the conceptual and measurement model. From these 3 factors, 8 sub-factors of empathy, encourage, enhancement, rational authoritativeness, flexibility, rejection, acceptance, control were constructed. 39 question items were derived in order to measure these sub-factors. Especially through the two rounds of factor analysis, the question items with enhanced internal consistency were derived and total cumulative variance was increased, which made theoretical model into the generalized model possible.

• Journal of the Korea Society of Computer and Information
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• v.21 no.3
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• pp.129-135
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• 2016

The aim of this study is to identify whether the game addiction has an impact on their school adjustment and to verify the direct effects and moderating effects of parent-child Communication. The survey was conducted to the children who were 5th and 6th graders in Gwangju and Jeonnam. The responses from 304 subjects were analyzed. The analytic results are as the following. When verifying the impact of game addiction on their school adjustment, The game addiction was found as the key variable that has a negative impact on children's school adjustment. The results indicated that children with higher levels of game addiction more likely to have lower levels of school adjustment. The impact of parent-child Communication on their school adjustment was analyzed. The analytic results suggest that parent-child Communication has a impact on their school adjustment. In other words, higher parent-child Communication means higher school adjustment. The moderating effect of parent-child Communication was analyzed. The parent-child Communication check the moderating effect of do game addiction on their school adjustment. The Implications of these findings were discussed.

• Korean Journal of Breeding Science
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• v.42 no.3
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• pp.212-217
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• 2010

A new waxy corn hybrid 'Daedukchal 1' was developed from single cross between CNU 504 and CNU 2396 at Chungnam National University in 2007. Inbred CNU 504 used as a seed parent and inbred CNU 2396 as a pollen parent were collected throughout domestic regions. Tasseling date of this hybrid was seven days later than that of check hybrid, 'Chalok 1'. 'Daedukchal 1' was 19.7 cm in ear length and 4.5 cm in ear diameter. On yield trial, ear length of this hybrid was increased 29.7% compared with a check hybrid, 'Chalok 1'. 'Daedukchal 1' had white kernels and good eating quality due to high sugar content and thinner pericarp. The ratio of kernel set length/ear length was similar to 'Chalok 1'. It is moderately resistant to southern leaf blight and northern leaf blight but susceptible to corn borer. The yields of 'Daedukchal 1' in fresh ear weight and in number of fresh ear were 16% and 8%, respectively, higher than those of a check hybrid in regional yield trials for two years. Seed production for this hybrid was better because of the consistency of tasseling dates.

• Korean Journal of Childcare and Education
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• v.13 no.6
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• pp.143-161
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• 2017

Objective: The purpose is to verify that whether there are significant correlation between parent-teacher cooperation, quality of home environment, and mathematical interaction of parents and cognitive development of 3-year-olds, and the quality of home environment and mathematical interaction mediate the relationship between the parent-teacher cooperation and the cognitive development. Methods: A test was performed on 110 3-year-olds enrolledin a daycare center located in city S, and a questionnaire survey was conducted on their parents. We analyzed our data using SPSS WIN 21.0 and pearson's correlation, tested the mediating effect using regression, and used the Sobel test to check significance of the mediating effect. Results: Cognitive development of 3-year-olds was correlated with the parent- teacher cooperation, the quality of home environment, and mathematical interaction of parents. The quality of home environment showed complete mediating effect on the relationship between the parent-teacher cooperation and the cognitive development, and the mathematical interaction showed complete mediating effect on the relationship between the parent-teacher cooperation and the cognitive development. Conclusion/Implications: The parent-teacher cooperation indirectly predicts the cognitive development through the quality of home environment and the mathematical interaction. This research can contribute to the development of the family- institution connection program to facilitate the parent-teacher cooperation.

• Korean Journal of Breeding Science
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• v.41 no.3
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• pp.279-283
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• 2009

A new yellow waxy corn hybrid "Daehakchal Gold 1" was developed from single cross between Yeongdeok Jaera and Okchen Jaera at Chungnam National University in 2007. Inbred CNU57 derived from Yeongdeok Jaera was used as the seed parent of Daehakchal Gold 1, and inbred CNU 27 derived from Okchen Jaera as the pollen parent. Tasseling date of this hybrid was seven day later than that of check hybrid, Chalok 1. Daehakchal Gold 1 was 19.7cm in ear length and 4.5cm in ear diameter. The yield of Daehakchal Gold 1 and check hybrid in dry matter were 146.5g and 113.9g per plant, respectively. On yield trial, which were increased 29.7% compared with a check hybrid, Chalok 1. Especially, Daehakchal Gold 1 had yellow kernels and good eating quality. The ratio of kernel set length/ear length was similar to Chalok 1. It is moderately resistant to Bioporalis maydis and corn borer. The yields of Daehakchal Gold 1 in fresh ear weight and in number of fresh ear were 16% and 8%, respectively, higher than those of a check hybrid in regional yield trials for three years. Seed production of this hybrid has gone well due to good match during crossing between seed and pollen parents.

• Korean Journal of Human Ecology
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• v.12 no.4
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• pp.463-495
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• 2003

The purpose of this study was to obtain a fundamental data for developing a policy concerning women and child rearing and a parent education program for young parents who are around their childbirth, a period crucially important both for the parents in terms of the role adjustment, career management, and family finance, and for the infants in terms of its physical and psychological well-being. The subjects were 509 mothers before and after childbirth currently living in the Metropolitan City of Daejeon. Data were obtained through questionnaires and interviews in two major areas of pregnancy-delivery-childcare and parent education. Data were analyzed using SAS, mostly through frequency analysis, percentiles, t-tests, and F-tests. Results of descriptive analyses were organized along the following areas and issues: Pregnancy(family planning, regular check-ups, difficulties, prenatal education, costs, etc.); delivery(type of delivery, delivery related experience, costs, clinic/medical institute of choice, worries/problems, help/supports, etc.); postpartum care(place, kinds of help and helper, costs, postpartum care facilities, etc.); childcare circumstances(place, carer, time schedules, childcare centers or facilities feeding and weaning, etc.); husband's attitudes and involvement in the overall process; working mothers(maternity leave, temporary retirement for child rearing, etc.); and, parent education(family planning, pregnancy, delivery, postpartum care, child rearing, areas or issues needing parent education, facilitative and hindering factors to ideal parenting, etc.). Differences between groups of pregnant mothers and postpartum mothers, working- and non-working mothers, groups of different income levels, mothers and fathers of different educational levels, mothers of first pregnancy(or childbirth) and experienced mothers were also analyzed. Several conclusions with suggestions were drawn in relation to the need for strong implementation as well as developing of policies on women and childcare and for developing a new parent education program for parents before and after childbirth.