• Journal of KIISE:Information Networking
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• v.32 no.6
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• pp.705-715
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• 2005

A peer-to-peer web caching has been studied recently as it can reduce the traffic converged on the server side and can support the traditional web caching model. Although the peer-to-peer web caching has the merit of having additional cache space from the local caches of peers without additional infrastructure, several constraints such as dynamic participation and local caching strategy caused by the autonomy of peers in peer-to-peer networks nay limit the performance of the peer-to-peer web caching. To overcome these limitations, we propose an efficient directory-based peer-to-peer web caching system under dynamic participation of peers. In the proposed caching system, we present new peer selection and replica management schemes by introducing the concept of the object lifetime in P2P networks. We evaluate the effectiveness of the proposed system through trace-driven simulations with a web log dataset. Simulation results show that the proposed system has higher accuracy and fewer redirection failures than the conventional directory-based P2P web caching system in feasible peer-to-peer networks.

• Journal of the Korea Society of Computer and Information
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• v.11 no.2 s.40
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• pp.253-261
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• 2006

In spite of the popularity of P2P technology, a multimedia streaming using the P2P technology has been neglected. The reason for this is that the P2P multimedia streaming has suffered from several inherent problems especially poor bandwidth and unreliable connection among peers. We suggest a Multi-Peer Binding Protocol (MPBP) in this paper that provides a virtual single channel composed of multiple connections to several peers to ease these problems. The protocol enables applications to download data from multiple peers simultaneously, so they can achieve throughput improvement and reliable streaming. For this, the MPBP splits media files into small chunks and provides a mechanism for identifying and transmitting each chunk. Implemented MPBP engine focuses on handling an abrupt disconnection from data sending peers and the evaluation result shows the MPBP is able to handle it gracefully. The MPBP is also desisted to support various media types. To verify this, video and audio applications are implemented using the MPBP engine in this paper.

• Journal of Digital Convergence
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• v.18 no.3
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• pp.123-131
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• 2020

The purpose of this study was to investigate the effect of task conflict on relationship conflict and the effect of relationship conflict on team satisfaction and to examine the moderating role of trust in peers in the relationship between task conflict and relationship conflict and the moderating role of team orientation in the relationship between relationship conflict and team satisfaction. The major findings were as follows: First, it was found that task conflict had a positive effect on relationship conflict and relationship conflict had a negative effect on team satisfaction. Second, it was found that trust in peers moderated the relationship between task conflict and relationship conflict. Third, it was also found that team orientation moderated the relationship between relationship conflict and team satisfaction. Based on the findings, practical implications and suggestions for future studies were provided.

• Korean Journal of Social Welfare
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• v.59 no.1
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• pp.145-170
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• 2007

The purpose of this study is to investigate pathways from family factors such as parental conflict, parenting behavior and adolescents' self-control to adolescent delinquency, and to explore the mediating effects of delinquent peers and school maladaptation. The 2004 Korea Youth Panel Survey data were used for analysis and the total number of subjects were 2,968 middle school students with two parents including step parents family. Data were analyzed using Structural Equation Modeling with AMOS 5 and SPSS 10. The major findings are summarized as follows. First, the effects of parental conflict on adolescent delinquency were mediated by parenting behavior, adolescents' self-control, delinquent peers and school maladaptation. Contrary to parental conflict, parenting behavior had a direct effect on adolescent delinquency as well as indirect effects. On the basis of these results, this article provided some suggestions for preventing or reducing adolescent delinquency.

• Journal of Convergence for Information Technology
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• v.8 no.3
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• pp.127-136
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• 2018

This study was to identify factors influencing satisfaction on clinical practice of dental hygienist students located in G, J region. The data was analyzed by t-test, Anova, Pearson correlation coefficient, and multiple regression using SPSS 21.0 program. There were significant in satisfaction of score(F=2.925, p<.05), perceive heath status(F=8.108, p<.001), satisfaction on department(F=8.198, p<.001). The relationship on peers with score(r=.277, p=.01) and perceive health status correlations with relationships on peers(r=.327, p=.01), The satisfaction on clinical practice had positive correlations with score(r=.127, p=.05), perceive health status(r=.226, p=.01), relationship on peers(r=.240, p=.01). The factors influencing satisfaction on clinical practice were satisfaction of relationship on peers, satisfaction of department, perceive health status. The results suggest that development of program to improve satisfaction on clinical practice of dental hygiene students.

• Korean Journal of Human Ecology
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• v.4 no.1
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• pp.31-38
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• 1995

The purpose of this study was to examine the relationship between social networks and perceived self-competence. The subject were 350 third and sixth graders selected from a public elementary school in Seoul. The children were administered the Pattison Psychosocial Network Inventory and The Self Perception Profile for Children. Three major questions are addressed; l)age changes 2)sex differences, and 3) the relation between the characteristics of social networks and self-perceived competence. Data were analyzed by pearson's product moment correlation, one-way ANOVA. Proportion measures were also used since they had allowed for the observation of relationship between two subsets of people within given categories(e.g.,the number of relatives divided by the number of relatives plus nonrelatives). The effects of age and sex of child on the number and daily contact with kin, nankin, peers, adults, males, and females were found. Sixth graders had a larger number of adults than third graders. While children had a greater number of adults than peers, they had more contact with peers than with adults in their network. It was found that boys had greater number of people in their network than girls. And boys had a larger number of and more contact with males, and girls had a larger number of more contact with females. The structure of childrens' social networks structure were correlated with perceived self-competence.

• Journal of the Korean Home Economics Association
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• v.43 no.10 s.212
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• pp.141-153
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• 2005

This study investigated the relationships among personal characteristics(sex, self-concepts, depression, fear, internal locus of control), home environment(physical and psychological environment, parenting style, attachment to mother), school environment(teacher support, peer victimization), and Korean-Chinese children's aggression in Yanji, China. Two hundred and two(90 boys and 112 girls) 6th graders rated themselves on a questionnaire. Correlation analysis, and multiple regression were conducted using SPSS Window vers. 12. Alienation to mother, and overt and relational victimization by peers were positively related, and communication with mother was negatively related to children's proactive aggression. Alienation to mother, and overt victimization by peers were positively related, and communication with mother, support by teacher were negatively related to children's reactive aggression. Alienation to mother, and overt and relational victimization by peers were positively related, and communication with mother and support by teacher were negatively related to children's relational aggression. The factor with the greatest contribution to explaining the aggression of Korean-Chinese in Yanbin was the alienation to mother.

• Korean Journal of Child Studies
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• v.32 no.4
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• pp.115-134
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• 2011

The purpose of this study was to understand children's negative attitudes exhibited towards peers with special needs in an inclusive kindergarten, utilizing ethnographic research methodology. The subjects consisted of 54 children undergoing typical development and three children with special needs in a public kindergarten in Busan metropolitan city. Data collection was conducted by means of participant observations and interviews took place from April until November, 2009. Our results revealed that the responses of 'not acknowledging presence', 'differentiating', 'adapting them to us', 'excluding at play' were major themes in children's negative attitudes exhibited towards peers with disabilities in an otherwise ostensibly inclusive kindergarten. The response of 'not acknowledging presence' was categorized as a way of ignoring their existence, whereas 'differentiating' was categorized as stressing difference, and assuring difference. There were two characteristics related to 'adapting them to us' : adapting them to our ways, adapting them to our knowledge. Concerning 'excluding from play', four characteristics were found : excluding indirectly, excluding directly, excluding illogically, and excluding by seeking majority accord. The implications of the findings for inclusive early childhood education were discussed.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.5 no.11
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• pp.2143-2159
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• 2011

The hybrid architecture of content delivery networks (CDN) and peer-to-peer overlay networks (P2P) is a promising technology enables effective real-time streaming services. It complements the advantages of quality control and reliability in a CDN, and the scalability of a P2P system. With real-time streaming services, however, high connection setup and media delivery latency are becoming the critical issues in deploying the CDN-P2P system. These issues result from biased peer selection without location awareness or content awareness, and can lead to significant service disruption. To reduce service disruption latency, we propose a group-based CDN-P2P hybrid architecture (iCDN-P2P) with a location/content-aware selection of peers. Specifically, a SuperPeer network makes a location-aware peer selection by employing a content addressable network (CAN) to distribute channel information. It also manages peers with content awareness, forming a group of peers with the same channel as the sub-overlay. Through a performance evaluation, we show that the proposed architecture outperforms the original CDN-P2P hybrid architecture in terms of connection setup delay and media delivery time.

• Journal of the Korean Society of School Health
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• v.27 no.2
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• pp.90-99
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• 2014

Purpose: This study examined the levels of and the associations between middle school students' attachments to parents, peers, and teachers, truancy, and school bullying. Methods: Data on middle school student were obtained from the Korea National Children and Youth Survey 2010 (N=2,968). The independent t-test and Kruskal-Wallis test were conducted to examine the differences in truancy and school bullying according to the characteristics of students. Multiple stepwise regression analysis was conducted to identify the factors influencing school bullying. Results: The magnitude of the correlation between truancy and bullying was r=.34 (p<.001). Two types of attachment(to parents and to teachers) were associated with school bullying, with the magnitude of r=-.06 (p=.003) and r=-.09 (p<.001), respectively. Truancy and all three types of attachment (to parents, peers, and teachers) predicted school bullying significantly (F=27.84, p<.001). Conclusion: In this study, truancy had more influence on bullying behavior than attachments to parents, teachers and peers among middle school students. These results suggest there is need to develop and provide programs to prevent or early intervene in truancy, an important predictor of school bullying, to reduce school bullying among middle school students.