• Journal of Communications and Networks
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• 제15권2호
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• pp.228-239
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• 2013

Peer-to-peer (P2P) systems have proved the most effective and popular file sharing applications in recent years. Previous studies mainly focused on equal service and differentiated service strategies when peers have no initial data before their downloads. For an upload-constrained P2P file sharing system, we model both the equal service process and the differentiated service process when the initial data distribution of peers satisfies some special conditions. Moreover, we show how to minimize the time required to distribute the file to any number of peers. The proposed fluid-based models can reveal the intrinsic relations among the initial data amount, the peer set size, and the minimum last finish time. The closed-form expressions derived from the extended models can closely approximate chunk-based models and systems, especially for relatively large files. As an application of the extended models, we show how to provide differentiated service efficiently to multiple peer sets. Since no limits are imposed on the upload bandwidth of peers or the size of each peer set, we believe that our analytic process and the results achieved can provide not only fundamental insights into bandwidth allocation and data scheduling but also a helpful reference for both improving system performance and building an effective incentive mechanism for P2P file sharing systems.

• 아동학회지
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• 제19권2호
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• pp.19-33
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• 1998

The relationships of maternal childrearing behaviors and peer experiences to children's self-esteem were examined with a sample of 433 5th- and 6th-grade elementary school students (236 boys and 197 girls) and their mothers. Children answered the questionnaires on peer experience (victimization by peers and peer aggression) and self-esteem, and their mothers answered the questionnaires on maternal childrearing behaviors. Maternal warmth was significantly related to children's self-esteem both in boys and girls. The warmer their mothers, the higher the children's self-esteem. Maternal permissiveness/nonintervention was related to self-esteem only in boys; the more permissive/nonintervention the mothers, the lower the boys self-esteem. Peer experiences (victimization by peers and peer aggression) were significantly related to self-esteem both in boys and girls; the more victimization by peers and peer aggression, the lower their self-esteem. Maternal warmth was related to victimization by peers only in girls; the warmer the mothers, the less victimization by peers experienced by girls. The effect of maternal warmth on self-esteem was mediated by victimization by peers for girls, which indicates that maternal warmth doesn't have a direct influence but an indirect influence on victimization by peers of children. Victimization by peers was related to peer aggression both in boys and girls. The more victimization by peers they experienced, the more peer aggression they showed.

• Human Ecology Research
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• 제51권3호
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• pp.333-340
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• 2013

The purpose of this study is to identify the influences of parental attitude, parenting attitudes, family function and peer attachment on the self-efficacy of middle school students in multicultural families. In particular, peer attachment was used as a mediator to determine the effects of self-efficacy. 302 multicultural family adolescents who enrolled in Seoul and Gyeonggi-do middle schools were surveyed. In order to measure the variables, this study used such scales as parenting attitude scale, family function scale, peer attachment scale and self efficacy scale. The results were analyzed by the PASW 18.0 program. The findings of the study led to the following conclusions; First, it has shown that peer attachment was the only variable that had significant differences by sex in middle school students of multicultural families. Second, the most influential variables of self-efficacy of middle school students in multicultural families was peer attachment among parenting attitude, family function and peer attachment. Third, there was a mediating effect of peer attachment among parenting attitude, family function and self-efficacy for adolescents of multicultural families. The notable distinction of this study was to find that peer attachment variable is the most important factor of self-efficacy. Considering the results in this study, aggressive intervention is necessary in order to improve the self-efficacy of middle school students in multicultural families.

• 한국생활과학회지
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• 제20권3호
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• pp.611-623
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• 2011

The purpose of this study was to investigate young children's play preferences through observation at their classrooms and to examine the relationship between children's play preferences and their peer competence and peer acceptance. The subjects were 55 four-year-old children from a kindergarten in C city of Chungnam province. The data was analyzed by MANOVA, t-test, and Pearson's correlation. The results were as follows: first, boys and girls showed different play preferences except for language play and science play. Boys were better liked by same-sex peers while girls were better liked by other-sex peers. Second, there were significant correlations among certain play preferences. Block play preferences were negatively correlated with other play preferences. Third, some play preferences were significantly associated with some sub-dimensions of peer competence. Language play displayed a positive relationship to pro-social behavior, but art play showed a negative relationship to leadership. Finally, peer acceptance was positively correlated only with number/manipulation play preferences. Other-sex peer acceptance was positively correlated with number/manipulation play preferences and art play preferences but negatively with block play preferences.

• Human Ecology Research
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• 제55권4호
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• pp.433-440
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• 2017

The purpose of the research was to examine the moderating effects of children's prosocial behavior on a potential relationship of attention-deficit/hyperactivity disorder and peer rejection as well as friendship. Participants consisted of 252, 3 year old including 136 boys and 116 girls. They were recruited from day care centers and preschools in Gyeonggi province and Incheon city. Prosocial behavior and attention-deficit/hyperactivity disorder syndrome were assessed based on teacher ratings. A peer nomination inventory was used to assess peer rejection and friendship. Children were asked to nominate three peers that they liked and considered friends as well as three peers that they did not like and did not consider friends. Findings suggested that prosocial behavior moderated the relation between attention-deficit/hyperactivity disorder and peer rejection as well as friendship. ADHD was related to peer rejection and fewer friends for children with lower levels of prosocial behavior. However, the association of attention-deficit/hyperactivity disorder and peer rejection was not significant for children who had higher levels of prosocial behavior. Moreover, attention-deficit/hyperactivity disorder did not influence to friendship for children who had the higher levels of prosocial behavior. The results indicate that increasing prosocial behavior may improve peer relationship functioning of children with attention-deficit/hyperactivity disorder.

• Perspectives in Nursing Science
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• 제17권1호
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• pp.40-48
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• 2020

Purpose: This study aimed to describe the empowerment experience of mentally ill persons providing peer support. Methods: Three peer supporters were recruited. A small group interview was conducted with peer supporters in November 2018. The transcribed data were analyzed using a qualitative case study. Results: Three primary themes and seven sub-themes emerged as follows. The first theme is "Personal empowerment," including 1) Remove the sense of helplessness, 2) Be confident, and 3) Establish self-identity. The second theme is "interpersonal empowerment", including 1) Breaking out of isolation and taking an interest in peers, and 2) Assert opinion to family. The last theme was "political empowerment", including 1) Want to legalize "peer support program", and 2) Move to promote "peer support program". Conclusion: Through the activities of peer support, mentally ill persons have diverse empowerment experiences. The results of this study indicated that legislation of the peer support program is necessary to improve their empowerment experience. And it calls for study focusing on the effectiveness and necessity of peer support programs.

• 통상정보연구
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• 제6권3호
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• pp.63-79
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• 2004

Peer-to-peer(P2P) has potential strength and possible factors which enable it to develop toward a new business by supplementing the limitation of the existing central server-type network. In various business sectors, various attempts have already been made to apply P2P. The computing power which was possible to be formed through peer-to-peer networking will become a powerful tools for expanding toward new business area depending the utilization methods by sector. Although the technology-centric P2P concept is a major interest now, its development direction will head toward service-centric P2P concept for satisfying desires of end-users(individual peers) for reliable contents and improving their purchasing convenience. But the solution requisites should be solved for the efficient application of P2P to business such as the establishment of and supplement for the industrial standard and legal system for P2P, the enhancement of peers recognition of P2P. Presently e-commerce using P2P is being implemented by a few enterprises locally by means of B2C. But if many enterprises enter this type of e-commerce, and the standardization of peer programmes, goods and documents is made, it will be able to be extended to B2B. Also it seems that it can be utilized in international transactions as well as in domestic transactions. So there is much room for the application of P2P to be extended further. Also there has been presented the necessity for related industries to support their work with theories and for academic studies to be made actively to set the direction of its development. It is hoped that multi-angled and in-depth studies on the utilization of P2P and various attempts to application of it to business be made on the basis of this study. For the development of P2P, continuous study and attempts are needed. The field of P2Ps application is very large and it will become a powerful tool, depending upon its application methods.

• 컴퓨터교육학회논문지
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• 제7권4호
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• pp.111-120
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• 2004

이 연구의 목적은 컴퓨터 프로그래밍 학습에서 동료지도학습 방법이 학습자의 학업 성취도와 참여한 학생들 간의 교우 관계에 미치는 영향을 조사하는 데에 있다. 이론과 실습이 병행되어 이루어지는 컴퓨터 프로그래밍 언어 교육에서 교사 주도의 강의식 수업은 이론 전달에는 효과적일 수 있지만, 학습자 개개인이 자신의 학습 속도에 적합하게 학습 내용을 이해하고 활용하기에는 한계가 있다. 이러한 한계를 극복하기 위한 한 대안으로, 실업계 고등학생 50명을 대상으로, 프로그래밍 언어 학습에서 동료지도학습을 적용하여 학업성취도와 교우관계의 변화를 조사하였다. 이 연구를 통하여, 동료지도학습이 학습자의 학업성취도와 교우관계의 변화에 긍정적인 영향을 미치고, 컴퓨터 수업의 한계를 극복할 수 있는 대안적인 교수 학습 방법의 하나로 그 가능성을 탐색하였다.

• 아동학회지
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• 제33권1호
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• pp.111-131
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• 2012

This study examined the relationship between parenting, the quality of peer relationships, and loneliness in adolescents. This study also examined the mediating effects of the quality of peer relationships on the relationship between parenting and adolescents' loneliness. A total of 506 1st and 2nd grade middle school students (261 boys and 245 girls) from the Seoul Metropolitan area completed measures of parenting, the quality of their peer relationships, and loneliness. The results indicated that adolescents' perceptions of parenting and the quality of their peer relationships were significantly related to their feelings of loneliness. Specifically, adolescents' perceptions of low levels of parental monitoring and high levels of abusive and neglectful parenting were associated with high levels of loneliness. Adolescents who perceived the quality of their peer relationships to be low reported high levels of loneliness. Further, the quality of peer relationships mediated the relationship between parenting and adolescents' loneliness; however, the pattern of associations differed for boys and girls. These findings suggest that both parent and peer relationship factors should be considered in combination in order to better explain loneliness in adolescents.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제3권2호
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• pp.57-62
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• 2014

실시간 멀티미디어 스트리밍 서비스를 제공하기 위해서는 많은 시스템 자원과 네트워크 대역폭을 필요로 한다. 이로 인해 각 컴퓨터가 동등한 능력을 가지고 어떤 컴퓨터에서라도 서로 클라이언트와 서버 역할을 수행하는 Peer-to-Peer(이후 P2P로 칭함) 구조가 많은 관심을 받고 있다. P2P 기법 중 본 논문에서는 사용자가 요구하는 콘텐츠를 효율적으로 검색하여 원하는 시간 안에 스트리밍 서비스 하는 기법에 연구의 주안점을 두었다. P2P상에 흩어져 존재하는 수많은 콘텐츠들 중 사용자가 요구하는 콘텐츠를 찾아내어 원하는 시간 내에 원활한 스트리밍 서비스를 제공하기 위해 lookup latency를 최소화 하는 콘텐츠 검색 알고리즘을 연구하였다. P2P기반 스마트 네트워크 시스템 구조는 슈퍼노드와 피어노드 그리고 슈퍼 게이트웨이로 구성된다. 스마트 네트워크 시스템 구조에서 제안한 콘텐츠 검색 알고리즘을 수행함으로써 사용자가 요구하는 콘텐츠를 원하는 시간 내에 검색하여 서비스할 수 있는 유연성을 제공하였다.