• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제10권4호
• /
• pp.1732-1750
• /
• 2016

Recently, Peer-to-Peer (P2P) live streaming assisted by the cloud computing has attracted considerable attention to improve the reliability of the P2P such as the resilience to peer churn and the shortage of upload capacity. The cost of cloud-assistance is comprised of the number of requests issued to the cloud and the amount of data fetched from the cloud. In this paper, we propose three techniques to reduce the cost of such a cloud-assistance.More concretely, in the proposed method, 1) each peer which lost its parent in the overlay can find a new parent by referring to the information registered in the cloud, 2) several peers which proactively fetch chunks from the cloud are dynamically invested, and 3) the number of requests issued to the cloud is reduced by allowing peers to fetch a collection of chunks using a single request. The performance of the proposed method is evaluated by simulation. The simulation results indicate that it reduces the cost of conventional scheme by 46% while guaranteeing the quality of live streaming service.

• 한국주거학회논문집
• /
• 제18권5호
• /
• pp.103-111
• /
• 2007

This is a basic study to investigate possibility to application of cohousing model into Korea. Purpose of this study is to grasp respondents' housing value, and its influence on intention to live in cohousing. Research method used for this study was a social survey. Respondents were 214 married people residing in Seoul and its outskirts by accidential sampling. The collected data were analyzed by SPSS 12.0 program using frequency, mean, average, factor analysis, t-test, one-way ANOVA, Duncan's multiple range test, multiple regression and legit analysis. Result of this study was as follows. Housing values were classified into three categories named as individualism oriented housing value, tradition oriented housing value, and economy oriented housing value. Housing values were different by respondents groups. For example, individualism oriented housing value showed difference according to age and housing area. Tradition oriented housing value showed difference according to sex, occupation, and period of residence, while economy oriented housing value showed difference according to housing type, and home ownership. In detail, men than women, single-income family than double-income family, and detached house resident than flat resident had higher tradition oriented housing value. The younger than the elder, and Seoul resident than outskirts resident had higher economy oriented housing value. Also home owner than tenant, and the higher tradition oriented group had stronger intention to live in cohousing than others.

• 한국실내디자인학회논문집
• /
• 제21권6호
• /
• pp.121-128
• /
• 2012

This study is designed to find out the difference of life satisfaction and depression between urban and rural elderly. The research method is a questionnaire that surveys those aged 60 and older. The collected data were analyzed by categorizing them into two groups, 503 residing in the elderly who live in Daejeon city and 676 in those who live in Chungnam area. The result of analysis indicated that; First, life satisfaction of the urban elderly was higher than that of the rural elderly(t=3.67, p<.001). But depression between the two groups, the elderly who live in urban area and those who live in rural area, did not show a statistically significant difference. Second, the factors influencing the life satisfaction of urban elderly were convenience of housing, economic level, health status, local safety, life attitude, and period of residence. Third, the depression of urban elderly significantly related to health status, life attitude, economic level, age, and convenience of housing. Fourth, the factors influencing the life satisfaction of rural elderly were health status, economic level, convenience of housing, local safety, life attitude, type of residence, and period of residence. Fifth, the depression of rural elderly significantly related to health status, life attitude, and economic level.

• 디지털콘텐츠학회 논문지
• /
• 제18권8호
• /
• pp.1523-1527
• /
• 2017

최근 사용자가 직접 촬영을 하여 콘텐츠를 만들고, 이 데이터를 인터넷을 통해 다수에게 방송하는 서비스들이 점점 많아지고 있다. 1인 미디어 라이브 서비스는 생활 속에서 인기를 끌고, 비슷한 서비스들이 일반화 되고 있다. 이러한 서비스는 대부분 일반 사용자를 대상으로 한다. 그러나 서비스 모델이나 상황에 따라, 특히 보안에 민감한 서비스 환경에서는 공유의 대상이 제한이 되는 경우들이 있다. 특히 군대, 관공서, 보안기관등 폐쇄망 환경에 있는 경우, 이들만의 특별화 된 서비스 구성이 필요하다. 따라서 본 논문에서는 폐쇄망 환경에서 1인 미디어 라이브 시스템을 구현하였다. 이를 통해 서비스 환경에 적합한 시스템 구성 요소를 알아보고, 이들을 어떻게 개발해야 되는지 연구하였다.

• Journal of Communications and Networks
• /
• 제10권4호
• /
• pp.430-436
• /
• 2008

Recent studies have convinced that network coding can improve the performance of live media streaming in terms of startup delay, resilience to peer dynamics, as well as reduced bandwidth cost on dedicated streaming servers. However, there still exist some strategy drawbacks and neglected problems which need to be further researched. In addition to the commonly used evaluation parameters of the network and user experiences mentioned above, we focus on additional key factors, playback lag and switch lag, which have not been fully explored in previous work. In this paper, we present SonicStream, a novel and fully implemented live peer to peer (P2P) media streaming system with consideration of rich user experiences, including startup delay, playback continuity, playback lag, switch lag, etc. In pursuit of a further enhanced user experience, we revise traditional peer selection/data scheduling methods. Through a series of experimental evaluations and a cautious comparison with the latest similar work $R^2$, the superior performance of SonicStream has been preliminarily verified.

• 지식경영연구
• /
• 제22권1호
• /
• pp.287-308
• /
• 2021

본 연구는 전자상거래에 있어 구매자가 판매자에 대해 지각하는 사회적 실재감이 신뢰와 라이브채팅 사용의도에 미치는 영향을 알아보고, 그러한 영향력이 라이브 채팅의 유형에 따라 어떻게 변하는 지 함께 살펴본다. 인공지능 관련 기술이 발달함에 따라 판매자와 구매자 간 라이브 채팅은 챗봇으로 빠르게 대체되고 있는데, 구매자들이 실제 판매자가 아닌 챗봇이 주도하는 라이브 채팅에 대해 어떻게 인지하고 있는지는 많은 연구가 되어 있지 않다. 이에 본 연구는 우선 사회적 실재감이 신뢰에 라이브 채팅 사용의도에 영향을 미칠 것이라 제안하고, 그 영향력은 챗봇의 경우보다 실제 판매자와의 상담일 경우 더 클 것이라 제안한다. 검증을 위해 232명의 전자상거래 사용자들에게 판매자와 챗봇 두 가지 종류의 라이브 채팅을 경험하게 한 후 설문을 진행하였다. 분석 결과 사회적 실재감은 신뢰와 라이브 챗 사용의도에 유의미한 영향을 미치는 것으로 나타났으나, 채팅 유형에 따른 영향력의 차이는 두드러지지 않았다. 본 연구의 결과를 통해 인공지능 기반 챗봇의 역할에 관심을 가지고 있는 많은 연구자들과 전자상거래 사업자를 포함한 실무자들에게 유용한 이론적, 실제적 함의를 제공할 것으로 기대한다.

• 경영정보학연구
• /
• 제25권1호
• /
• pp.213-231
• /
• 2023

라이브 스트리밍의 급속한 발전과 더불어 온라인 호스트가 중요한 정보원으로서 라이브 스트리밍 커머스 성과에 영향을 미치는 데 중요한 역할을 한다. 하지만 제품 유형이 호스트의 특징과 라이브 스트리밍 커머스 성과 사이의 관계에 대한 연구는 많이 이루어지지 않고 있다. 본 연구는 정교화 가능성 모델(Elaboration Likelihood Model)과 정보원 이론(Information Source Theory)을 기반으로 라이브 스트리밍 커머스의 매출에 영향을 미치는 요인과 이들 간의 관계에 대한 제품 유형의 조절 역할을 실증적으로 연구하는 것을 목적으로 한다. 2021년 10월 10일부터 2022년 2월 10일까지 수집된 11,422건의 라이브 스트리밍 커머스 데이터를 분석한 결과, 다중채널 네트워크(Multi-Channel Network)와 팔로워수는 라이브 스트리밍 커머스의 판매량에 긍정적인 영향을 미치는 반면, 평판 점수는 매출에 부정적인 영향을 미치는 것으로 나타났다. 또한 저관여 제품의 비율이 이 관계들에 미치는 조절 효과도 확인되었다. 이번 연구 결과는 라이브 스트리밍 커머스 성과에 대한 문헌을 풍부하게 하고, 시사점뿐만 아니라 연구의 한계점과 향후 연구 방향에 대해서도 논의하였다.

• 대한건축학회논문집:계획계
• /
• 제35권4호
• /
• pp.3-14
• /
• 2019

The purpose of this study is to analyze the distribution characteristics of the agency-managed shared housings in Seoul and draw the possible implications from it. The needed data for the study was obtained from an on-line shared housing portal service which provides housing information from various shared housing management agencies. By mapping out the locations and other related data into a GIS(Geographic Information System) program, this study shows that shared housings in Seoul can be sorted into four large clusters. Each cluster has a different ratio of housing types and room capacities reflecting each regional circumstance and common causes. Women-only shared housing takes up 79% of the overall shared housing ratio and, while multi-family housing type has the most count, the apartment type has a noticeably high ratio in women-only housing compared to the apartment type ratio among the other gender-specific housings. Given the high crime rate against the single-person household of young adult women, the reason for the popularity of shared-apartment housing among young women can be deduced. However, the potential tenants' practical choices and their concern for safety are not the only causes that drive the current shared housing market. The young adults in their 20's and 30's choose to live in popular places where they can engage social activities. A new tier of shared housing market has also appeared in places where young adults could not have afforded if they lived alone. Choosing where we live is no longer about just meeting the requirements for a house based on what she/he needs but also about satisfying the preferences for a living based on what she/he desires. This paper indicates that although there is an undeniable premise that 'sharing a house' revolves around the realm of housing welfare and is not a typical topic for the upper-income households, the way we live and how we choose our place to live is shifting.

• 여성건강간호학회지
• /
• 제28권4호
• /
• pp.348-357
• /
• 2022

Purpose: This study aimed to identify maternal, infant, and perinatal mortality using the national population data of South Korea between 2018 and 2020, and to analyze mortality rates according to characteristics such as age, date of death, and cause of death in each group. This study updates the most recent study using 2009 to 2017 data. Methods: Analyses of maternal, infant, and perinatal mortality were done with data identified through the supplementary investigation system for cases of death from the Census of Population Dynamics data provided by Statistics Korea from 2018 to 2020. Results: Between 2018 and 2020, a total of 99 maternal deaths, 2,427 infant deaths, and 2,408 perinatal deaths were identified from 901,835 live births. The maternal mortality ratio was 11.3 deaths per 100,000 live births in 2018; it decreased to 9.9 in 2019 but increased again to 11.8 in 2020. The maternal mortality ratio increased steeply in women over the age of 40 years. An increasing trend in the maternal mortality ratio was found for complications related to the puerperium and hypertensive disorders. Both infant and perinatal mortality continued to decrease, from 2.8 deaths per 1,000 live births in 2018 to 2.5 in 2020 and from 2.8 in 2018 to 2.5 in 2020, respectively. Conclusion: Overall, the maternal, infant, and perinatal mortality statistics showed improvements. However, more attention should be paid to women over 40 years of age and specific causes of maternal deaths, which should be taken into account in Korea's maternal and child health policies.

• 대한간호학회지
• /
• 제13권2호
• /
• pp.44-57
• /
• 1983

The explosion of the aging population is changing the social environment of today's older people. Traditionally in Korea, a large percentage(over 90%) of elderly parents have lived with their married first son. But today, the number of elderly who live with their married sons has decreased(65.6%) The number of those who live in a different situation such as with their married daughter, unmarried offspring, with a spouse or alone has increased (34.4%) We can expect that the number of the elderly who have to live in institution will increase. The objective of this investigation was to determine differences in the number of health Complaints of older people according to their living situation with a view to planning more effective health care. The sample consisted of 231 persons over 65 years of age, 60 living in an Old Age Home ana 171 living in their own home in Kwangju. Data were gathered from July 9 to 26, 1983 by nursing students using a Questionnaire which was a modified form of the Cornell Medical Index. The data were categorized according to the subjects, living, sex, educational level, previous occupation, hobbies and sexual activity. The date were analyzed for statistical significant differences using F and X²tests. findings included the following: 1. There was a higher number of health complaints from persons who live in the institution than those living at home, but the difference was not significant. 2. The highest number of health Complaints were from persons who live alone, followed by those living with their daughters, and then by those living in the institution. Persons who live with their sons had the least Complaints. The difference in the number of Complaints accord-ing to with whom they were living was significant. 3. Women had signincantly more Complaints than men. Persons who were not living with their spouses had significantly more complaints than those living with their spouses.4. The higher eductional level the persons had, the less health Complaints they had. The number of Complaints accoraing to educational level was significantly different. 5. The highest number of health complaints were from persons who had involved in Commerce and industry, followed by those in Agriculture. Persons who were civil servant had the least 6. There were more complains from persons who had no hobby than those with hobbies. The complaints. The difference was significant. difference was significant. 7. Persons who said they were sexually inactive had significantly more complaints than those who said they were sexually active. As age increased, sexual activity significantly decreased. Those who lived with their spouse were significantly more sexually active. 8. The highest number of Somatic Complaints were eye fatigue, followed by nocturnal frequency, lumbago, cramps in extremities, vertigo, stiffness in Shoulder, tinnitus, common cold and constipation. The order of Psychic Complaints from higher to lower were anger. sensitivity, anxiety, depression and loneliness. 9. This group of Elderly persons said they valued Health the most, followed by Harmony, Religion, Money and Honor.