• Title/Summary/Keyword: peer to peer

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An Efficient Peer-to-Peer Streaming Scheme Based on a Push-Mesh Structure (푸시-메시 구조 기반의 효율적인 피어투피어 스트리밍 기법)

  • Kim, Jin-Sung;Kim, Dong-Il;Kim, Eun-Sam;Pae, Sung-Il
    • Journal of the Korea Society of Computer and Information
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    • v.15 no.3
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    • pp.81-89
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    • 2010
  • The research on peer-to-peer streaming schemes has largely focused on tree-push and mesh-pull structures. However, the tree-push structure has a defect that the tree restructuring time is long, and the mesh-pull structure has long startup delay and lag time from source servers. In this paper, we propose a new peer-to-peer live streaming scheme based on a push-mesh structure that takes advantages of tree-push and mesh-pull structure simultaneously. This structure basically provides the mesh-pull mechanism for data transmission and utilizes peers with high network upload capacity. It also supports the push mechanism along with paths from a source server, super peers, and selected general peers. By NS-2 simulation experiments, we finally show that our proposed scheme can achieve shorter startup delay than the mesh-pull structure, similar lag time to tree-push structure and best playback continuity among the three schemes.

Impact of Peer Attachment on Children's Subjective Well-being : Mediating Effects of Self-esteem (또래애착이 아동의 주관적 행복감에 미치는 영향 : 자아존중감의 매개효과)

  • Kim, Sang woo;Jo, Min a
    • Journal of Korean Physical Therapy Science
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    • v.29 no.3
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    • pp.63-74
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    • 2022
  • Purpose: The purpose of this study is to examine the mediating effect of children's perceived peer attachment on children's subjective well-being and the effects of self-esteem, one of the variables of individual personality characteristics, on peer attachment and subjective well-being. Design: Data from the 2018 Panel Study on Korean Children were used. Methods: The survey method was conducted by the investigator, and the total number of cases was 1,434 people. Results: First, the higher the child's peer attachment leads to higher subjective well-being and self-esteem, and the higher the self-esteem leads to higher subjective well-being. Second, in the relationship between peer attachment and subjective well-being, self-esteem acts as a mediator variable. Third, children's peer attachment affects subjective well-being and self-esteem, and self-esteem affects subjective well-being. The results explain that the degree of children's peer attachment itself affects subjective well-being and self-esteem, and self-esteem also affects children's subjective well-being. Conclusion: Self-esteem is an important factor influencing subjective well-being and has a mediating effect on the relationship between peer attachment and subjective well-being. In other words, it can be understood that children feel subjective well-being through positive interactions with peers, not only in parent relationships. Based on these results, it is necessary to suggest practical interventions to enhance children's subjective sense of well-being and to develop various programs that can strengthen the sub-factors of peer attachment.

Participation in Bullying and the Peer Relationship Related to Children's Social Status (아동의 사회적 지위에 따른 또래괴롭힘의 참여행동과 친구관계)

  • Kim, Youn-Hwa
    • Journal of the Korean Home Economics Association
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    • v.51 no.2
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    • pp.187-193
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    • 2013
  • This study investigated the relation between participation in bullying, peer relationship and children's social status. We examined the classified types of social status among 700 fifth and sixth grade elementary schools students. The data were obtained by administering a self-reported questionnaire. Differences were identified with participation in bullying behavior, intimacy friendship and peer support as peer relationship. The collected data were subjected to a descriptive and F-test analysis using the SPSS software program. The results conveyed that social status was different according to the gender difference. Rejected boys presented more bully, reinforce, assistant and victim behaviors. Neglected boys were more victims of bullying. Defensive behavior was more apparent in popular and neglected boys. Furthermore, such boys had high intimate friendships. Popular boys presented distinctively more peer support. Rejected boys represented less intimate friendship and peer support. On the other hand, popular girls portrayed more defensive behavior. However, rejected girls and neglected girls had less defensive behaviors. Victim behaviors were less coherent in popular and neglected girls. Intimate friendship and peer support were mostly apparent in popular girls. Rejected boys represented less intimate friendship and peer support.

A Study on Science and Technology Scholarly Societies' Understanding on Open Peer Review (과학기술 학회의 개방형동료심사에 관한 인식 연구 : 한국과학기술총연합회 산하 학회를 중심으로)

  • Jeong, Yong-il;Ro, Ji-Yoon;Cho, Sung-nam;Ahn, Sungsoo
    • The Journal of the Korea Contents Association
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    • v.22 no.10
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    • pp.59-73
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    • 2022
  • Open peer review intends to help review a manuscript in a transparent and accountable manner, opening up the identity of a reviewer and authors in a scholarly journal. Although some research about open peer review, for example, authors' understanding of open peer review, exists, research about editors' perspectives of a scholarly journal in Korean domestic science and technology fields has not been found. Editors' views may include whether an academic journal plans to adopt open peer review, when they might adopt it, or what the possible benefits, challenges, and issues in adopting open peer review would be. This paper presents a survey scheme, data, and analysis of Korean editors' perspectives on open peer review. Specifically, we designed the online survey questionnaire, collected the survey data from journal editors, and analyzed the survey results to explore editors' understanding of open peer review. We then compared our research with previous work, such as our Focused Group Interview and other similar domestic and foreign analysis. This study result is expected to help make an open peer review policy for public institutes to provide essential services for scholarly journals, including a scholarly peer review system. Academic society may also get some insights in adopting the open peer review method in the peer-review process.

Efficient Mobile P2P Structure for Content Search Services (콘텐츠 검색 서비스를 위한 효율적인 이동 P2P 구조)

  • Kwak, Dong-Won;Bok, Kyoung-Soo;Kang, Tae-Ho;Yeo, Myung-Ho;Yoo, Jae-Soo;Joe, Ki-Hung
    • The Journal of the Korea Contents Association
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    • v.9 no.1
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    • pp.30-44
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    • 2009
  • In this paper, we propose the mobile P2P structure supporting content searches for mobile peers efficiently. The proposed mobile P2P structure is a 3-tier structure which consists of a mobile peer, a mobile super peer, and a stationary super peer to reduce the content search cost of mobile P2P service. For content searches, mobile peer searches content in the communication range and performs hierarchical content searches which is using mobile super peer, stationary super peer for expansion of query region. In order to support hierarchial content searches and the continuity of services according to peer mobilities, peer's join/leave processes are explicitly stored by supporting message structures to the upper layer It is shown through experimental evaluation that the proposed structure improves about 32% contents search performance over the existing 2-tier structure. Since it also reduces the messages transferred to the stationary super peers, it reduced about 25% search loads of them.

Online Submission and Review System for Open Science: A Case of AccessON Peer Review Management System Plus (ACOMS+)

  • Jaemin Chung;Eunkyung Nam;Sung-Nam Cho;Jeong-Mee Lee;Hyunjung Kim;Hye-Sun Kim;Wan Jong Kim
    • Journal of Information Science Theory and Practice
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    • v.12 no.1
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    • pp.87-101
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    • 2024
  • As the academic publishing environment evolves rapidly and the open science paradigm emerges, the demand for efficient and transparent peer review is growing. This study outlines efforts to actively introduce advanced concepts in scholarly communication into the submission and review system. AccessON Peer Review Management System Plus (ACOMS+), developed and operated by the Korea Institute of Science and Technology Information, is an online submission and peer review system that aims for open science. This study provides an overview of ACOMS+ and presents its four main features: open peer review, open access publishing and self-archiving, online quantitative/qualitative evaluation, and peer reviewer invitation. The directions for further developing ACOMS+ to fully support open science are also discussed. ACOMS+ is the first system in Korea to introduce the open peer review process and is distinguished as a system that supports open access publishing and digital transformation of academic journals. Furthermore, ACOMS+ is expected to contribute to the advancement of the academic publishing environment through the increasing shift toward open access publishing, transparent peer review, and open science.

The Effects of Family Risk Factors, Ego-Resilience and Quality of Peer Relationships on Adolescent Problem Behaviors (가정의 위험요인, 자아탄력성 및 또래관계의 질이 청소년의 문제행동에 미치는 영향)

  • Han, Hyun-A;Doh, Hyun-Sim
    • Korean Journal of Child Studies
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    • v.29 no.1
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    • pp.87-101
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    • 2008
  • This study examined the influence of family risk factors, ego-resilience, and quality of peer relationships on adolescent problem behaviors in a sample of 335 8th grade students (178 boys and 157 girls). They responded to four kinds of questionnaires. Data were analyzed by independent t-tests, correlations, and multiple regressions. Results showed that family risk factors had direct effects on ego-resilience which directly affected quality of peer relationships. Family risk factors, ego-resilience and quality of peer relationships had direct effects on internalizing problem behaviors. Family risk factors and quality of peer relationships had direct effects on externalizing problem behaviors. Family risk factors indirectly influenced adolescent internalizing/externalizing problem behaviors through ego-resilience and quality of peer relationships.

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Relationships between Peer Acceptance, Peer Victimization and Self-Esteem in Adolescents (또래수용성 및 또래괴롭힘과 청소년의 자아존중감간의 관계)

  • Yang, Won Kyung;Doh, Hyun Sim
    • Korean Journal of Child Studies
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    • v.20 no.1
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    • pp.223-238
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    • 1999
  • Relationships between peer acceptance, peer victimization, and self-esteem in adolescents were examined in a sample of 392 eighth grade students(189 boys and 203 girls). Data were collected using questionnaires regarding peer acceptance(social preference and social status), peer victimization, and self-esteem of adolescents. High social preference was positively related to self-esteem. Social preference varied as a function of social status both in boys and in girls. Popular boys had higher self-esteem than neglected and rejected boys; popular girls had higher self-esteem than neglected girls, who had higher self-esteem than rejected girls. The more boys and girls were victimized by peers, the lower their self-esteem. The higher their social preference, the less they were victimized. Rejected boys and girls experienced peer victimization much more than either popular or neglected boys and girls.

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The Influence of Attachment with Mother on Self-Concept, Peer Relationship and School Adjustment in Korean-Chinese School Age Children (중국 조선족 아동의 어머니와의 애착이 자아개념, 또래관계 및 학교생활 적응에 미치는 영향)

  • Lee, Sa-Rah;Park, Hye-Won
    • Journal of the Korean Home Economics Association
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    • v.43 no.9 s.211
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    • pp.109-127
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    • 2005
  • The present study examined the relationships among maternal attachment, self-concept, peer relationship, and school adjustment. The subjects were 293 Korean-Chinese elementary school students living in Yanji and Shenyang, China. The Inventory of Parent and Peer Attachment (Armsden & Greenberg, 1987), Social Competence Inventory(Doh & Falbo, 1999), and Self-Perception Profile for Adolesents(Harter, 1988) were used to measure the subjects' maternal attachment, and peer relationship, school adjustment, and self-concept, respectively. When structural equation modeling was applied, the results supported not only the model that maternal attachment and self-concept exert an influence on peer relationship, but also the model that they exert an influence on school adjustment. The results of this study suggest that the secure maternal attachment of Korean-Chinese works as an important mechanism that explains their peer relationship and adjustment at elementary school.

Effects of Individual and Classroom Contexts on Peer Victimization of Preschool Children (유아의 또래 괴롭힘 피해에 대한 유아 개인 및 학급 맥락의 영향)

  • Shin, Yoo-Lim
    • Journal of Families and Better Life
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    • v.27 no.6
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    • pp.13-20
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    • 2009
  • This study investigates the effects of individual and classroom variables on peer victimization through the use of multi-level models. The participants were 297 preschool children recruited from preschools. Teachers completed rating scales that assessed peer victimization, aggression, and prosocial behaviors. Peer nomination was used to measure social preference and friendship. The results showed that the aggression level of classrooms as well as social preference and friendship were associated with peer victimization. The findings imply that the individual as well as the social context should be considered before preventive intervention programs for peer victimization are implemented.