• Proceedings of the Korea Information Processing Society Conference
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• 2001.04a
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• pp.275-278
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• 2001

인터넷의 활용이 급속도로 확산되어지고 사용환경도 점점 고급화가 되어가고 있다. 분산환경에는 네트웍에 연결된 각 Peer 들의 유휴자원을 이용하여 대규모의 데이터를 처리하기 위한 연구와 기존의 클라이언트-서버 환경에서의 부하를 각 Peer들에게 분산시키는 연구가 활발하게 진행되고 있다. 이 연구에서는 서버의 지원이 없는 순수 Peer-to-Peer 환경에서 현재의 Peer 들의 네트웍 구성을 살펴보고 효율적으로 중복된 메시지를 제어하기 위한 Ring-based 클러스터를 통한 네트웍 구성 환경과 클러스터간의 메시지 전파와 대역폭에 따른 클러스터 기법을 제안한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2009.01a
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• pp.376-380
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• 2009

Peer-to-Peer content delivery technology recently begins to be used not only for file sharing applications such as eDonkey but also for every kind of content services. KBS, a broadcasting company in Korea, is aggressively driving to apply Peer-to-Peer technology to KBS's commercial internet video service but we found that there are two big huddles. First, end users may refuse to share their own resources for KBS's cost reduction using Peer-to-Peer content delivery technology. Second, it may cause that the number of free-riders increases and the efficiency of the overall system would fall. From commercial service provider's perspective, we have to avoid that end users have unfavorable impressions on the service and the usefulness of Peer-to-Peer technology decreases. In order to overcome these problems, we studied how to offer incentive to end users and how much incentive would be reasonable, and then applied the result to real service for verification.

• Journal of Families and Better Life
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• v.20 no.5
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• pp.125-136
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• 2002

This study investigated the relationships between parental marital conflict, attachment to parents and peer relationships. The mediating role of attachment to parents was also explored in the relationship between parental marital conflict and peer relationships. Two hundred eighty four 8th graders participated in this study. The participants answered questionnaires regarding parental marital conflict, attachment to parents, qualify of their friendship, and attachment to peers. The main results of the study are as follows: First, adolescents who perceived a higher level of parental marital conflict reported less positive feelings and more negative feelings toward their friends. They also reported lower peer attachment, and tended to perceive their friendship functions negative. Second, adolescents who showed stronger attachment to their parents reported more positive feelings and less negative feelings toward their friends. They reported higher peer attachment, and perceived friendship functions positively. Third, adolescents who perceived a higher level of parental marital conflict showed weaker attachment to their parents. Finally, attachment to fathers and mothers mediated the association between parental marital conflict and peer relationships. In other words, parental marital conflict had an indirect effect on peer relationships. The results suggest that attachment to fathers and mothers that resulted from parental marital conflict played an important role in determining peer relationships among adolescents, rather than the existence of the parental marital conflict itself.

• Journal of the Korean Home Economics Association
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• v.40 no.11
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• pp.11-22
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• 2002

This study investigated the difference in adopting strategies and goals and the relations in strategies, goals and peer acceptance in term of gender and ages under peer conflict situation. The 625 subjects were selected from the fifth and sixth graders of elementary schools and the first and second graders middle schools. The instruments of measurement were Conflict Resolution Measure, Sociometric Scale. The main findings of this study are as follows: 1) Children's strategies in peer conflict situation has significant difference according to gender and grade. 2) Children's goals in peer conflict situation has significant difference according to gender and grade. 3) There were signigicant correlation between strategies and goals. 4) There were significant correlation in strategies and peer acceptance.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.13 no.1
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• pp.133-151
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• 2019

In order to achieve faster content distribution speed and stronger fault tolerance, a P2P peer can connect to multiple peers in parallel and receive chunks of the data simultaneously. A critical issue in this environment is selecting a set of nodes participating in swarming sessions. Previous related researches only focus on performance metrics, such as downloading time or the round-trip time, but in this paper, we consider a new performance metric which is closely related to the network and propose a peer selection algorithm that produces the set of peers generating optimal worst link stress. We prove that the optimal algorithm is practicable and has the advantages with the experiments on PlanetLab. The algorithm optimizes the congestion level of the bottleneck link. It means the algorithm can maximize the affordable throughput. Second, the network load is well balanced. A balanced network improves the utilization of resources and leads to the fast content distribution. We also notice that if every client follows our algorithm in selecting peers, the probability is high that all sessions could benefit. We expect that the algorithm in this paper can be used complementary to existing methods to derive new and valuable insights in peer-to-peer networking.

• Journal of Child Welfare and Development
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• v.16 no.2
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• pp.47-66
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• 2018

This study aimed to identify any possible correlations among the empathy ability, peer relationships, and smartphone addiction of upper-grade elementary school students; the effects of empathy ability and peer relationships on smartphone addiction; and to verify the mediating effect of the empathy ability between peer relationships and smartphone addiction. To this end, the empathy ability, peer relationship, and smartphone addiction tests were conducted among 154 six-grade elementary school students in Gyeonggi and Our findings were as follows; First, in terms of the correlations among empathy ability, peer relationships, and smartphone addiction, the empathy ability and peer relationships were shown to have a positive correlation while the empathy ability and smartphone addiction turned out to have a negative correlation, which was also the case between peer relationships and smartphone addiction. Second, when it came to the effects of the empathy ability and peer relationships on smartphone addiction, the emotional empathy as part of the empathy ability and the esteem out of peer relationships were shown to have a negative effect on smartphone addiction, indicating that an increase of emotional empathy and esteem resulted in less smart phone addiction. Third, in terms of the effect of peer relationships on smartphone addiction with the empathy ability as a medium, peer relationships and smartphone addiction were shown to be partially mediated by the empathy ability. These findings are meaningful in that they could serve as the basic data for the development of smartphone addiction prevention programs for elementary school students.

• Journal of the Korea Society of Computer and Information
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• v.11 no.5 s.43
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• pp.29-37
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• 2006

The distributed system is used that it's features of the fault tolerance and good performances. One of the distributed systems, a peer-to-peer tech, has high availability to share resources. However when peers wanna share resources, it isn't online like the peer using resources of the search time. Therefore we usually use the re-transmission method to download all resources. It's not good at the performance of the peer-to-peer system so we need to good solution. In this study, we wanna use the peer-to-peer system with the partner peer that works same download method simultaneously. We wanna have the effective performance to reduce the search stage additionally.

• Korean Journal of Human Ecology
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• v.13 no.5
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• pp.659-672
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• 2004

This study examines different individual, family, and school environmental variables that affect victimization by peer aggression among adolescents. The sample consists of 868 seventh and eighth graders. Statistics and method for data analysis include Cronbach's alpha, percentage, means, standard deviation, Pearson correlation, multiple regression, and hierarchical regression. The major findings of this study are as follows: First, adolescents, both withdrawn and aggressive, have lower achievement in school work. Boys experience more direct victimization by peer aggression. Adolescents, especially boys, often experience indirect victimization by peer aggression, when they become withdrawn, own lower self-esteem, and have lower achievement in school work. Second, adolescents have more direct victimization by peer aggression when their parents are negligent of them. Also, adolescents seem exposed to indirect victimization by peer aggression when they receive more physical and emotional abuse and negligence from their parents. Third, adolescents experience more victimization by peer aggression-whether it's direct or indirect, when they cannot get adjusted to peer relations and get teachers' supervision. Fourth, as to direct victimization by peer aggression, withdrawal, one of the individual variables, is the most reliable prediction followed by gender, negligence, adaptability in peer relations, aggression, and teacher's supervision in sequence. For indirect victimization by peer aggression, withdrawal is the most reliable prediction followed by adaptability in peer relations, gender, physical and emotional abuse, and negligence in sequence.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.315-318
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• 2009

A payment system is required to buy various services and micropayment system is demanded for minimizing a frequent payment transaction cost in ubiquitous environment. It is not guarantee that devices are always online and payment system is required a robustness when some of them is offline. To solve this situation other systems use a centralized broker but the problem with most existing micropayment system is the heavy load on the broker. In this paper present a payment system a DHT based Peer-to-Peer micropayment system for ubiquitous environment can use even if payments need not be online and reduce broker's load.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.4B
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• pp.305-313
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• 2011

This paper presents a P2P (Peer-to-Peer) overlay multicast tree construction algorithm to support stable multimedia service over the Internet. While constructing a multicast tree, it takes into account not only the link delay, but also peer stability. Since peers actually show dynamic and unstable behavior over P2P-based network, it is essential to consider peer stability. Furthermore, the weighting factor between link delay and peer stability is adaptively controlled according to the characteristics of the multicast tree. Basically, Genetic algorithm is employed to obtain a near optimal solution with low computational complexity. Finally, simulation results are provided to show the performance of the proposed algorithm.