• KSII Transactions on Internet and Information Systems (TIIS)
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• v.14 no.11
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• pp.4372-4394
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• 2020

The distribution of popular videos incurs a large amount of traffic at the base stations (BS) of networks. Device-to-multi-device (D2MD) communication has emerged an efficient radio access technology for offloading BS traffic in recent years. However, traditional studies have focused on synchronous user requests whereas asynchronous user requests are more common. Hence, offloading BS traffic in case of asynchronous user requests while considering their time-varying characteristics and the quality of experience (QoE) of video request users (VRUs) is a pressing problem. This paper uses social stability (SS) and video loading duration (VLD)-tolerant property to group VRUs and seed users (SUs) to offload BS traffic. We define the average amount of data transmission (AADT) to measure the network's capacity for offloading BS traffic. Based on this, we formulate a time-varying bipartite graph matching optimization problem. We decouple the problem into two subproblems which can be solved separately in terms of time and space. Then, we propose the socially aware D2MD user selection (SA-D2MD-S) algorithm based on finite horizon optimal stopping theory, and propose the SA-D2MD user matching (SA-D2MD-M) algorithm to solve the two subproblems. The results of simulations show that our algorithms outperform prevalent algorithms.

• Korean Journal of Social Welfare
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• v.66 no.1
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• pp.61-85
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• 2014

Lately, as the problem of the aged poverty becomes a big social issue, this paper studies the problem of financial stability with respect to the income and consumption of before-and-after retirement generations. After dividing the data in Korean Longitudinal Study of Ageing(KLoSA) into retired and non-retired groups, this study compares the difference among ageing groups by cross analysis and t-test. First, the result tells that the total personal income of retired group is lower than the one of non-retired group. Second, the public pension income benefit ratio of retired group is only 30% of it's total income, and the amount of public pension appears to be 40% of the total pension income. The benefit ratio of the personal pension income is low as about 1% in both groups, The private transfer income of the retired group takes relatively large portion in its total personal income. Third, as people gets older, financial stability gets worse because consumption does not decrease as much as the income decreases. Fourth, it is turned out that the expectation of old life supporting from nation is low in both groups. Fifth, the factors that affects the income of the public pension in the retired group are gender, age, education, and health status, when compared with the factors to the personal total income of the non-retired group. In terms of policy, this paper emphasizes the needs of the intensification of the public pension and the support for the revitalization of the personal pension.

• The Journal of the Korea Contents Association
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• v.20 no.9
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• pp.589-603
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• 2020

The purpose of this research is to 'know what causes the social isolation felt by marriage immigrant women'. Thus, a total of 253 cases of marriage immigrant women who use Multi-cultural Family Support Center in D city have been analyzed. The findings reveal that the factors influencing the sense of isolation in the social environment, experienced by immigrant women married to Koreans are: social support, family relationships, self-esteem, household income and economic activity. In other words, their strong sense of isolation from society will be lessened when they get more social support, are happy with their family relationships, have their improved self-esteem, earn higher household incomes and don't take part in undesirable economic activities. Based on the research results, this study makes suggestions, on both a political and practical level, to solve the above problem of social isolation faced by marriage immigrant women through their financial stability, desirable economic activities, healthy family relationships, the enhancement of self-esteem and the provision of generous social support for them.

• 한국노년학
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• v.32 no.4
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• pp.1041-1061
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• 2012

The study looked into the effect of housing poverty on the depression level for the elderly in depth. In this study, we defined housing poverty as sub-minimum standard housing conditions, excess housing expenditure and housing instability. In order to verify the correlation of two variables, a mediating model structured by social welfare service was used which gave out the 4th Korea welfare panel data. When it came to our research methods, structured equation analysis was applied to verify the mediating effect and theoretical background. The results revealed that housing poverty of the elderly directly affected their depression level. Also the satisfaction of social service showed a partial mediating effect between housing poverty and depression level. But the mediating effect of social service experience between housing poverty and depression level was not statistically significant. The outcome of this study indicated the practical and social intervention to promote a mental health of the elderly by improving residential environment.

• Journal of Convergence for Information Technology
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• v.11 no.3
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• pp.205-211
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• 2021

This study utilizes PhotoVoice, a qualitative research method, to explore the life experiences of retirees by age in depth and derive the social welfare implications required for successful aging of retirees. Two participants in the study were selected in their 70s, 60s, and 50s, and 24 photos, explanations, 44 stories, and 92 data collected through group activities and personal interviews were analyzed. With the perception of successful aging, those in their 70s were "Preparing for a High Level of Social Responsibility and Dignity," those in their 60s were "Life of Social Responsibility and Service with Embarrassment and Boeun," and those in their 50s were "Life of Self-reliance with Economic Stability and Consideration." In order to prevent social problems for retirees with longer old age, research and social welfare policy support for their social jobs and volunteer positions are urgently needed, and the sooner the preparatory education is implemented so that they can prepare enough. This study is significant in that it played an important role in presenting basic data for the preparation of social welfare alternatives for retirees.

• (The)Study of the Eastern Classic
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• no.50
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• pp.7-28
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• 2013

The present study examines some essays by Yi Seol (李?, 1850-1906; pen name Bogam), a government official at the end of the Joseon Dynasty. Written in Classical Chinese, the essays are contained in The Collected Essays of Bogam (Bogam munjib). The study begins with a brief review on the Yeonan Yi Clan to which the official's family belonged, and then on his personal life history. The study goes on to analyze the contents of Yi's essays, which are classified into two themes: 1) his affirmation of the contemporary idea that saw the world as divided into the Chinese and the Barbarians, which justified and reinforced his resistance against Japan; and 2) his views on how to regain social stability. Concerning the former theme, Yi asserts that Joseon should not betray Qing China and should purge his nation of Japanese influence. Naming Japan as the evil enemy of Joseon, Yi expresses his firm resistance against the neighboring nation. As for the latter theme, his essays put forth an array of suggestions on how to disband the Donghak rebels, who emerged at the end of Joseon, and how to restore people displaced in the aftermath of social uprising. Although the suggestions are mostly general ones, he repeatedly stresses the importance of social stability in some of his essays addressed to the king.

• Journal of The Korean Society of Integrative Medicine
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• v.10 no.1
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• pp.137-147
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• 2022

Purpose : The purpose of this study is to investigate how the existence of companion animals and the type of companion animals affect the quality of life and emotional stability of adults in their 20s. Methods : The subjects of this study were adults in their twenties living in Busan who could understand the method of this study. The survey method was conducted with a questionnaire, consisting of 4 questions on general characteristics, 26 questions on quality of life, and 20 questions on emotional stability for a total of 50 questions. An independent t-test and one-way ANOVA were used to verify the difference in quality of life and emotional stability according to general characteristics. Results : As a result of analyzing the difference in the quality of life of the study subjects, the case of having a companion animal scored statistically significantly higher in the satisfaction of the physical domain, psychological domain, living environment domain, overall quality of life domain, and social domain. In addition, there was a statistically significant difference in the case of companion animals according to the type of companion animal. However, there was no statistical significance in the analysis of differences in emotional stability of study subjects according to the presence or absence of companion animals. Conclusion : This study was conducted with 400 adults in their twenties to determine the effects of the presence and absence and type of companion animals on the quality of life and emotional stability of adults in their twenties. As a result, the group with companion animals showed higher satisfaction scores than the group without companion animals in terms of quality of life. This suggests that raising companion animals for adults in their 20s has a positive effect on improving their quality of life. Therefore, it can be recommended for the physical, psychological, and social health of adults in their 20s.

• Journal of the Korean Society of Safety
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• v.28 no.4
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• pp.58-65
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• 2013

Transportation and further expansion of social infrastructure was needed along the development of urbanization and population concentration. To use the underground space due to the lack of availability of land, it is inevitable to intersect between present structure and tunnel during construction. Soil grouting is one of the ground improvement methods to reinforce weak soil around the underground structures by injection of grouting liquid. Some of central columns of an upper structure are damaged during injection of grouting liquid by injection pressure. To investigate and improve the stability of the tunnel, three dimensional analysis are performed with full construction stages which includes the construction of present underpass, damaging columns of the underpass, reinforcing the columns by H-pile and shear walls, and excavation and construct tunnel. The arrangement of grouting holes such as curtain and horizontal type affects largely to the stability of upper structure and horizontal arrangement diminish the shear forces which is the cause of damage of central columns. The liquid injection type of reinforcement for tunnel is not recommended while the presence of upper structure with columns. Wall type reinforcing is utilize for permant support of upper structures which is affected by grouting injection pressure. H-pile is utilize for temporary support, but not for permanent since the sharing of shear forces is not much to shear wall during tunnel construction.

• The Journal of the Korea Contents Association
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• v.13 no.12
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• pp.966-973
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• 2013

It has been frequently asked the question not only by academicians but also by practitioners whether employment flexibility can be compatible with employment stability. This study tries to find the answer by investigating the German model of employment flexibility practices and job stability policies. The German model of employment flexibility is mainly based on working-time accounts and short-time work programs. It is found that social partnership and government support have played a crucial role to stabilize German labour market. Workers, employers, and government have harmoniously interplayed in order for overcoming the economic hardship. Adapting the German experience of overcoming economic turbulence by introducing employment flexibilization can help Korean firms. However, it is important to recognize that there are some differences in practices of labour relations, cultural and social background while applying the German practices.

• Journal of Engineering Education Research
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• v.16 no.1
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• pp.27-34
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• 2013

The purpose of this study is to analyze work values of undergraduates according to major and gender. The result of this research is following. First, undergraduates from engineering and social science department took a very serious view of achievement and leasure of body and mind in work values. Second, undergraduates made much of achievement, job stability, leasure of body and mind, economic compensation and reputation. And undergraduates thought that internal value orientation was more important than external value orientation. Third, two groups had significant difference in service, knowledge pursuit, patriotism, economic compensation, reputation, and indoor activity. Fourth, the result of this analysis according to gender is following. Male undergraduates made much of leasure of body and mind, achievement, job stability, knowledge pursuit, and economic compensation in order. But female undergrduates made much of economic compesation, leasure of body and mind, achievement, and job stability in order. Fifth, that undergraduates make little of domain of service and patriotism gives a suggestion as to improvement of course education. As a result, this study is suggestive of instruction and advice in course search curriculum.