• Journal of the Korea Society for Simulation
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• v.7 no.1
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• pp.39-51
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• 1998

In this paper, MVED (Minimum Vehicle's Empty Distance), a new dispatching rule for a Single Loop-Single Vehicle AGV system, is developed. Single Loop-Single Vehicle AGV system consists of segmented bi-directional single loops, in which only one AGV is assigned. The MVED rule is focused on minimizing vehicles empty travel distance. Using simulation, the performance of the MVED is compared with that of existing dispatching rules such as STT/D and MEVTT. The results show MVED rule's better performance than others. ARENA is used as a simulation language.

• Korean Journal of Child Studies
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• v.29 no.3
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• pp.207-222
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• 2008

This research studied the social-emotional competence of children whose primary caregiver was a single-mother or single-father alone compared with children living with a single-parent but the primary caregiver was a non-parent (e.g. a grandparent). Subjects were 208 children (105 boys, 103 girls) from 10 elementary schools in 3 metropolitan cities. Instruments were the Adaptive Behavior Checklist constructed by the researcher, Self-esteem Inventory (Kim, 1987) and Emotional Competence Scale (Kim, 1998). Results showed that children in single-mother families were more social-emotionally competent than children in single-father families. Children whose primary caregivers were non-parents had higher self-esteem than children whose primary caregivers were single parents alone. There were interaction effects of caregiver variables on children's peer relationships and awareness/expression of their own emotion.

• Journal of Families and Better Life
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• v.16 no.4
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• pp.107-124
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• 1998

The purposes of this study were to find the general trends of single mothers' and adoescents' family resources stress perceptions coping and psychological well-being to examine the differences and correlations among single mothers' and their adolescents' variables and to analyze the effects of socio-demographic variables and family stress influencing psychological well-being. The subjects were the 568 single mothers and their adolescents living in Kwangju. The major findings were as follows; 1. Scores of single mothers' and their adolescents' family resources stress perceptions were lower than median but their stressors problem solving-focused coping life satisfaction and depression were higher than median. Single mothers' stressors coping stress perceptions were significantly higher than their adolescents' 2. Single mothers' family rsources stressors stress perceptions coping life satisfaction and depression were positively related to adolescents' 3. Single mother family's l fe satisfaction were influenced by stress perceptions problem solving-focused coping family strengths. Single mother family's depression were influenced by stress perceptions emotion-focused coping.

• Journal of the Korean Home Economics Association
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• v.43 no.1 s.203
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• pp.85-103
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• 2005

This study attemped to analyze the financial stati of single households. The financial stati of single households were analyzed using the income and expense stati, balance sheet status and selected financial ratios as components. The data of 757 single household's from the 1998 Korean Household Panel Study were utilized. The major findings are summarized as follows; 1. Male single households had higher income and expense stati than those of females but lower holdings of other asset with the exception of liquid assets. Single elderly households had the highest holdings of both real assets and debt. 2. Usually single households were retained more short-term than long-term liquid assets. The debt burden ability in using net assets was the lowest of all assets. To accumulate capital those in single household were more likely to have savings than investment assets.

• Corrosion Science and Technology
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• v.22 no.1
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• pp.36-43
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• 2023

Single-crystal Ni-rich NCM is a material that has drawn attention in the field of lithium-ion batteries due to its high energy density and long cycle life. In this study, we investigated the properties of single-crystal NCM 811 and its potential for use in lithium-ion batteries. High-quality single crystals of NCM 811 were successfully synthesized by crystal growth via a flux method. The single-crystal nature of the samples was confirmed through detailed characterization techniques, such as scanning electron microscopy and x-ray diffraction with Rietveld refinement. The crystal structure and electrochemical performances of the single-crystal NCM 811 were analyzed and compared to its poly-crystal counterpart. The results indicated that single-crystal NCM 811 had electrochemical performance and thermal stability superior to poly-crystalline NCM 811, making it a suitable candidate for high-performance batteries. The findings of this study contribute to a better understanding of the characteristics and potential of single-crystal NCM 811 for lithium-ion batteries.

• Journal of Families and Better Life
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• v.20 no.6
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• pp.209-217
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• 2002

In this study, I analyzed single people time use and leisure behavior. I have compared patterns of time use of the single people who completed a survey for this study with the data from Time Use Survey(Korea National Statistics office, 1999). The survey participants included 160 single people who were thirty- to forty-years-old and who were living alone. The data from the Time Use Survey by NSO contained 2,004 married people cases and 30,155 unmarried individuals cases. The major findings are as follows: First, the single people who participated in this study were not especially anti-marriage; they simply have not been married yet and were living in a one-person household. Second, single people spent more time at work and less time for leisure and socializing than two comparative groups. Third, single people spent more time for household labor than other groups, and the only exception was the married female group. There was no gender difference in the time spent at household work Finally, single people tended to spend their leisure time with passive activities such as reading a newspaper or a magazine, watching television, and listening to the radio.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.18 no.1
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• pp.103-114
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• 2008

Single Sign-On is an authentication scheme that enables a user to authenticate once and then to access to the resources of multiple software systems without re-authentication. As web services are being integrated into a single groupware, more web sites are adopting for user convenience. However, these Single Sign-On services are very dependent upon the cookies and thus, simple eavesdropping enables attackers to hiject the user's session. Even worse, the attacker who hijacked one session can move to another site through the Single Sign-On. In this paper, we show the vulnerabilities of the top ranked sites regarding this point of view and also propose a way to protect a user's session.

• Genomics & Informatics
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• v.20 no.1
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• pp.2.1-2.11
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• 2022

The method of single-cell RNA sequencing has been rapidly developed, and numerous experiments have been conducted over the past decade. Their results allow us to recognize various subpopulations and rare cell states in tissues, tumors, and immune systems that are previously unidentified, and guide us to understand fundamental biological processes that determine cell identity based on single-cell gene expression profiles. However, it is still challenging to understand the principle of comprehensive gene regulation that determines the cell fate only with transcriptome, a consequential output of the gene expression program. To elucidate the mechanisms related to the origin and maintenance of comprehensive single-cell transcriptome, we require a corresponding single-cell epigenome, which is a differentiated information of each cell with an identical genome. This review deals with the current development of single-cell epigenomic library construction methods, including multi-omics tools with crucial factors and additional requirements in the future focusing on DNA methylation, chromatin accessibility, and histone post-translational modifications. The study of cellular differentiation and the disease occurrence at a single-cell level has taken the first step with single-cell transcriptome and is now taking the next step with single-cell epigenome.

• Journal of Korean Public Health Nursing
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• v.23 no.2
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• pp.162-173
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• 2009

Purpose: This study investigated the health and socioeconomic status of single-parent and partnered families, and examined the intersection between sex and single-parent status focusing on inequalities of health and socioeconomic status. Methods: This was a cross-sectional study using the data from the nationally representative 2005 Korean National Health and Nutrition Examination Survey. A total of 14,827 respondents had custody of their own children and other family members (13,943 were coupled families and 891 were single-parent). Results: Our result indicate that single-parent had poorer health status and were more likely to have lower educational attainment, lower household income, no home ownership and be unemployed. However, the association between single-parent status and socioeconomic and health inequality were in divergent ways according to sex. The most socioeconomically disadvantaged were single-parent women. Inequalities in health differ markedly by sex but vary little according to single-parent status. Conclusions: An uneven distribution of socioeconomic resources might help us to understand why single-parent, both women and men, have worse health than parents who live together. Previously recognized sex gap with regard to health status also might help us to understand the difference in health between single-parent men and single-parent women found here.

• Journal of Families and Better Life
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• v.33 no.4
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• pp.147-160
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• 2015

This study analyzed the differences in adjustment and family environments of adolescents from three different family structures, using the KCYPS panel 4th wave data from first graders in middle schools. The participants of the study consisted of 1,715 adolescents in two-parent families, 79 adolescents in single-father families, and 113 adolescents in single-mother families. The data were analyzed by means of descriptive statistics and ANCOVAs. The findings of this study indicated that adolescents in two-parent families showed a lower level of physical symptoms than those in single-mother families and a lower level of participation in classwork than those in single-father families whereas adolescents in single-father families were more likely to be involved in delinquency than those from the other two family structures. In addition, significant differences were found in family environments including parents' physical health and life satisfaction, family economic status, parenting behaviors, and parents' absence at home after school. Parents in single-mother and single-father families were less healthy physically, showed lower levels of life satisfaction, reported less income, and spent less money for their children, compared to those in two-parent families. With regard to parenting behaviors, single fathers tended to be less warm toward and neglected their children more than single mothers and parents in two-parent families. Adolescents in single-father families were most likely to be left alone at home after school, followed by those in single-mother and two-parent families. The results suggested that specific attention needs to be paid to adolescents from single-father families in order to support their adjustment.