• Journal of Ecology and Environment
• /
• v.31 no.1
• /
• pp.75-81
• /
• 2008

Rates of molecular evolution are known to vary widely among taxonomic groups. A number of studies, examining various taxonomic groups, have indicated that body size is negatively and clutch size is positively correlated with the rates of nucleotide substitutions among vertebrate species. Generally, either smaller body mass or larger clutch size is associated with shorter generation times and higher metabolic rates. However, this generality is subject to ongoing debate, and large-scale comparative studies of species below the Order level are lacking. In this study, phylogenetically independent methods were used to test for relationships between rates of the mitochondrial cytochrome b evolution and a range of life history traits, such as body mass and clutch size in the Order Galliformes. This analysis included data from 67 species of Galliformes birds and 2 outgroup species in Anseriformes. In contrast to previous studies, taxa were limited to within-Order level, not to Class or higher. I found no evidence to support an effect of life history traits on the rate of molecular evolution within the Galliformes. These results suggest that such relationship may be too weak to be observed in comparisons of closely related species or may not be a general pattern that is applicable to all nucleotide sequences or all taxonomic groups.

• Journal for History of Mathematics
• /
• v.13 no.1
• /
• pp.63-76
• /
• 2000

In this paper we survey the main properties of a Fibonacci sequence, and find out examples of Fibonacci sequence in our nature and daily life.

• Journal for History of Mathematics
• /
• v.35 no.5
• /
• pp.131-146
• /
• 2022

This study is to find out how to use the materials of East Asian history in mathematics classroom. Although the use of the history of mathematics in classroom is gradually considered advantageous, the usage is mainly limited to Western mathematics history. As a result, students tend to misunderstand mathematics as a preexisting thing in Western Europe. To fix this trend, it is necessary to deal with more East Asian history of mathematics in mathematics classrooms. These activities will be more effective if they are organized in the context of students' real life or include experiential activities and discussions. Here, the study suggests a way to utilize the mathematical ideas of Bāguà and Liùshísìguà, which are easily encountered in everyday life, and some concepts presented in 『Nine Chapter』 of China and 『GuSuRyak』 of Joseon. Through this activity, it is also important for students to understand mathematics in a more everyday context, and to recognize that the modern mathematics culture has been formed by interacting and influencing each other, not by the east and the west.

• The Journal of the Korea Contents Association
• /
• v.17 no.10
• /
• pp.120-139
• /
• 2017

The purpose of this research was to explore life history of an elderly woman who fled from North Korea and to understand and provide interventions for female North Korean Defector. The participant of this research is an 81-year-old woman who escaped from North Korea and has lived in South Korea for over 14 years. This life history study followed the analysis of Mandel baum(1973) pointing three perspectives of life: dimensions, turnings, and adaptations. This study concluded that the participant of the research study had no protection while staying in China and North Korea and had experience of Homo Sacer. And even after arriving to South Korea the participant had to live her life with the past negative experiences in North Korea and China. Based on the research results discussions and implications were suggested.

• Korean Journal of Family Social Work
• /
• no.56
• /
• pp.69-104
• /
• 2017

This research aims to understand in depth and contextually of the grandchildren 's growth with their grandparents. The data were collected through in-depth interviews with observation and documents and analyzed using life history approach. The life history method was based on Mandelbaum(1973)'s framework including 'life dimensions', 'turning points', and 'adaptations'. After the analysis, central themes in each domain emerge as follows; 'social prejudice', 'growing poverty', 'a painstaking smile', 'more polite and honest', and 'being alone' in life dimensions, 'parentless children', 'a painful memory, outcast', and 'going to college' in turning points, and 'a willing person, parents', 'a blessed person', 'self-reliance and scale of economic life', and 'diligence and inborn cheerfulness' in adaptations, respectively. Based on these results, several intervention strategies and implications for healthy growth of grandchildren.

• Journal of the Korean Home Economics Association
• /
• v.44 no.8
• /
• pp.161-169
• /
• 2006

This study emphasizes the everyday life study based on the proper study method. From the sociological literatures, everyday life's concept, it's various characteristics, two different perspectives and life-history approach are introduced. One Home Economics Paradigm Study published in 1996 is summarized to point out the importance of paradigm shift from quantitative method based on positivism to qualitative study for human everyday life study. I examined our everyday life studies as a reader and a member of screening committee and introduced four articles using different qualitative study methods.

• The Journal of the Korean life insurance medical association
• /
• v.1 no.1
• /
• pp.7-14
• /
• 1984

• The Journal of the Korea Contents Association
• /
• v.18 no.8
• /
• pp.210-226
• /
• 2018

This study was to explore the life history of an elderly woman who had six times of imprisonment and entered a Samchung re-education camp. This study of life history followed the analysis of Mandelbaum(1973) pointing three perspectives of life: dimensions, turnings, and adaptations. Participant's dimensions of life were exploitation of labor, hostess life for U.S. military, prison life, Samchung re-education camp, marriage with the disabled, life of a farm worker. Turnings of life were serving as a maid, confinement of prison, life of hostess for living, being remanded to Samchung re-education camp by state violence, marriage and divorce, denial of social welfare service. Adaptations of life were downright adaptation in early life, exaggerated act in juvenile reformatory, prostituted women as a simple fortune-maker, adaption as a good wife and wise mother after marriage, resistive adaption as a self-employed. and farm worker. Based upon this results outcome, discussions and implications were suggested.

• Animal cells and systems
• /
• v.3 no.2
• /
• pp.167-172
• /
• 1999

We report for the first time the life history of a 'social' spider, Philoponella prominens, living in a temperate region. Philoponella prominens hibernated as immatures or subadults for 7-8 months in 1995 and 1996 from September-October to April-May in central Korea. When they emerged from their winter hibernation, a majority began their lives as commensals in the webs of other species. As the mating season approached, however, commensal spiders switched to become colonial or solitary. The mating season began in early June and lasted until early August. Newly-hatched spiderlings began to appear in the field in late June. They formed a colony by building their webs connected to the mother's by using pan of the mother's web as supporting substrates. As the season progressed, however, some of the colonial spiderlings became commensal or solitary individuals. Our field observations suggest that Philoponella prominens form colonies or commensal associations to reduce the web-building cost.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 2008.04a
• /
• pp.60-64
• /
• 2008

According to previous research, welding-induced stress in steel structures can significantly affect the fatigue behaviour; it produces initial damage of weldiug part of structure locally and residual stresses reduce the fatigue strength after welding precess. In this study, through continuum damage mechanics, we can estimate the weldiug damage using the stress and strain history during welding process and the effect of welding residual stress for assessment of fatigue life. The variation of welding-induced stresses and strains need be traced precisely in advance for a reliable weldiug damage assessment. In this study, a damage and fatigue analysis techniques for steel structures with welding-induced residual stress are presented. First, We calculate the history of temperature according with welding process. And residual stress with a welding thermal history was evaluated by non-linear thermal stress analysis. Secondly, welding damage and fatigue life are estimated with kinetic damage law.