• Proceedings of the Korean Information Science Society Conference
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• 2001.04b
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• pp.28-30
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• 2001

클라이언트-서버 환경에서 공간 데이터와 같은 대용량의 데이터를 처리하는 시스템이나 다수의 클라이언트의 요구가 발생하는 시스템에서는 데이터 처리 시 발생하는 서버 I/O 연산의 수행 비용과 질의 처리비용 및 결과 데이터의 전송 비용이 서버 사이드의 병목 현상과 질의 처리속도의 저하라는 문제점을 유발한다. 본 논문에서는 이러한 문제점을 개선하기 위한 방법으로 서버 처리비용의 분산을 위한 확장된 Peer-to-peer를 지원하는 방식을 제안하며, 이러한 확장 된 Peer-to-peer방식을 지원할 수 있는 공간데이터 관리기의 설계 및 구현상황을 제안한다. 공간데이터 관리기는 서버에 접속된 클라이언트의 정보와 클라이언트에 캐쉬된 데이터의 정보를 관리하는 공간데이터 관리기의 CIT(Client Information Table)와 이 CIT에 가용한 데이트를 캐쉬한 클라이언트가 여럿인 경웨 대상 클라이언트의 선정이 요구되며, 적은 비용으로 처리 가능한 클라인트의 선정의 위한 알고리즘과 클라이언트 사이의 확장된 Peer-to-peer 방식을 지원하기 위한 서버와 클라이언트간의 데이터 일관성 유지를 위한 데이터 유효성 관리를 제안한다.

• The KIPS Transactions:PartA
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• v.11A no.7 s.91
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• pp.511-520
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• 2004

A peer-to-peer model is very useful in solving the server link bottleneck problem of a client-server model. In this work, we discuss the problems of distributing multimedia content over peer-to-peer network. We focus on two problems in peer-to-peer media content distribution systems. The first is the transmission scheduling of the media data for a multi-source streaming session. We present a sophisticated scheduling scheme called fixed-length slotted scheduling, which results in minimum buffering delay. The second problem is on the fast distribution of media content in the peer-to-peer system that is self-growing. We propose a mechanism accelerating the speed at which the system's streaming ca-pacity increases, called FAST.

• Korean Journal of Human Ecology
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• v.4 no.1
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• pp.26-35
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• 2001

The Purpose of this study was to examine the difference among peer orientation according to socio-demographic variables and mothers' rearing behavior of early adolescents and to analyze the effect of these variables influencing peer orientation. The subjects were 399 students-sixth grade and second grade in middle school students, living in Gwangju. The major findings were as follows : 1. Peer orientation of early adolescents showed partial differences according to the socio-demographic variables and mothers' rearing behavior. Peer advice seeking showed significant difference according to child's grade, reasoning guidance, affection and active-education of mother. And extreme peer orientation was difference in the child's grade, sex. family type, reasoning guidance and over-protection of mother. 2. The order in the effective power of variables on peer orientation of early adolescents was as following. Peer advice seeking was influenced by the child's grade and affection that were explained about 21%. And extreme peer orientation was influenced by reasoning guidance. over-Protection. the child's sex, and family type that were explained about 17%. In conclusion, Mothers' rearing behavior was influenced on peer orientations. Above all children's peer orientations are need for the improvement mothers' behavior reasoning guidance. affection.

• Korean Journal of Health Education and Promotion
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• v.20 no.3
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• pp.281-299
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• 2003

Even though the rate of infection of HIV is very low compared to other countries, data show a steady rise in HIV infection rates among young people in South Korea. A peer education program was provided to prevent the incidence of AIDS in young people. The program used peer leaders to provide AIDS related information and counseling for middle school students. Peer leaders received special training in AIDS related education and counseling to assist their friends. Peer leaders worked with their mends in one-to-one or small group settings. A pretest-posttest control design (six months after intervention) was used to evaluate the effects of the peer education program for prevention of AIDS. A post-intervention survey found that do you mean six months after the program or after six months of programs of peer program activities, the experimental groups(groups with peer educators) showed better knowledge, more positive attitudes, and less sexual activity when compared to control groups of non-participants(groups without peer educators). Peer leaders showed significant gains in knowledge about HIV transmission, more positive attitudes and self-efficacy not to engage in high-risk behaviors. Peer education was an effective tool for increasing knowledge, improving attitudes and self-efficacy, and encouraging appropriate behavior change.

• Journal of KIISE:Computing Practices and Letters
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• v.7 no.6
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• pp.630-640
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• 2001

In this paper, we describe the design and implementation of ObjectPeerWork, which is a framework for the development of shared object model-based P2P(Peer-to-Peer) applications. The shared object model can prevent the computing power decrease on the way of resource management by incorporating the resource management function into resources themselves, and raise reliability on shared resources by improving the security problems. Also this model assures expandability by means of distributed component-based request broker manager and module container. The ObjectPeerWork based on this shared object model is a framework which makes the implementation of the enterprise information system possible, and makes distribution of the computing power and efficient resource management possible by improving the weakness in the general P2P model.

• Journal of Korean Academy of Nursing
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• v.35 no.4
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• pp.694-700
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• 2005

Purpose. The purpose of this study was to determine the relationship between peer and parental factors and smoking behavior of adolescents in urban cities and to investigate whether there are gender differences. Methods. A stratified and random cluster sampling design was used to obtain a cross-sectional sample of high school students in two urban cities. The sample consisted of 512 Korean adolescents (256 boys and 256 girls) aged 15 to 18 (mean age 16.7$\pm$.58). Self-reported questionnaire consisted of adolescent smoking behavior, peer smoking and alcohol use, parental smoking and alcohol use, father-mother-peer relationships and perceived social support from peers and parents. Multiple logistic regression analysis was used to examine the hypothesized model. Results. The findings showed that peer and parental factors accounted for $30.3\%$ of the variance in adolescent smoking and peer smoking was most strongly associated with adolescent smoking behavior (OR = 10.18). In addition, peer smoking (OR = 4.71), peer alcohol use (OR = 4.21), and peer relationships (OR = 1.03) were significantly associated with boys' smoking behavior. In girls, peer smoking (OR = 26.50) and parent smoking (OR = 5.48) were significantly associated with smoking behavior. Conclusions. Consistent with previous findings, peer smoking is a significant factor on adolescent smoking. Specifically, boys would be more influenced from peers than girls. Therefore, smoking prevention programs for adolescents might be focused on the social context such as, resisting to peer pressure and enhancing the self-efficacy to control.

• Korean Medical Education Review
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• v.23 no.1
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• pp.11-22
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• 2021

This review of the literature explored the experiences and effects of peer-assisted learning in basic medical education. Peer-assisted learning is most commonly utilized to teach clinical skills (including technical skills) and medical knowledge (76.4%). It has also been used, albeit less frequently, to facilitate small-group discussions including problem-based learning, to promote students' personal and professional development, to provide mentoring for career development and adaptation to school, to give tutoring to at-risk students, and to implement work-based learning in clinical settings. Near-peer learning is a common type. The use of active learning techniques and digital technology has been increasingly reported. Students' leadership had frequently been described. Student tutor training, programs for teaching skills, institutional support, and assessments have been conducted for effective peer-assisted learning. There is considerable positive evidence that peer-assisted learning is effective in teaching simple clinical skills and medical knowledge for tutees. However, its effects on complex skills and knowledge, small-group discussions, personal and professional development, peer mentoring, and work-based learning have rarely been studied. Additionally, little evidence exists regarding whether peer-assisted learning is effective for student tutors. Further research is needed to develop peer-assisted learning programs and to investigate their learning effects on student tutors, small-group discussion facilitation, personal and professional development, peer mentoring, and peer-led work-based learning in the clinical setting in South Korea. Formal programs and system advancement for a student-led learning culture is needed for effective peer-assisted learning.

• Educational Technology International
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• v.20 no.1
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• pp.57-81
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• 2019

This study aimed to investigate effects of peer feedback types and feedback acceptance levels on academic achievement in project-based learning. The participants were 70 middle-school students taking an English course. They were divided into corrective and suggestive feedback groups. These participants were asked to create user-created content (UCC) as an individual task and provide peer feedback on a peer's UCC in the same type of feedback group. Results showed that there were significant differences in academic achievement according to peer feedback types (corrective vs. suggestive) and feedback acceptance levels (high vs. low). In particular, the suggestive peer feedback group had higher academic achievement than the corrective peer feedback group. Moreover, the group with a high level of feedback acceptance gained higher academic achievement than the group with a low level of feedback acceptance. Moreover, there was an interaction effect between peer feedback types and feedback acceptance on academic achievement. These results indicate that peer feedback types and feedback acceptance should be considered for effective peer feedback activity. These findings provide practical implications for the design and implementation of peer feedback activity in project-based learning.

• Journal of Communications and Networks
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• v.14 no.3
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• pp.286-295
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• 2012

To meet the increased demand of video-on-demand (VoD) services, peer-to-peer (P2P) mesh-based multiple video approaches have been recently proposed, where each peer is able to find a video segment interested without resort to the video server. However, they have not considered the constraint of the server's upload bandwidth and the fairness between upload and download amounts at each peer. In this paper, we propose a novel P2P VoD streaming system, named peer cache adaptation (PECAN) where each peer adjusts its cache capacity adaptively to meet the server's upload bandwidth constraint and achieve the fairness. For doing so, we first propose a new cache replacement algorithm that designs the number of caches for a segment to be proportional to its popularity. Second, we mathematically prove that if the cache capacity of a peer is proportional to its segment request rate, the fairness between upload and download amounts at each peer can be achieved. Third, we propose a method that determines each peer's cache capacity adaptively according to the constraint of the server's upload bandwidth. Against the proposed design objective, some selfish peers may not follow our protocol to increase their payoff. To detect such peers, we design a simple distributed reputation and monitoring system. Through simulations, we show that PECAN meets the server upload bandwidth constraint, and achieves the fairness well at each peer. We finally verify that the control overhead in PECAN caused by the search, reputation, and monitoring systems is very small, which is an important factor for real deployment.

• Korean Journal of Child Studies
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• v.30 no.6
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• pp.195-208
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• 2009

The main body of research literature on peer relations has focused on its effects on children's psychosocial and emotional development from preschool period to adolescence. Topics of the research generally consist of peer acceptance/rejection, friendships, and peer victimization. In the review of domestic and international research conducted since late 1990, research trends and issues are described in this paper. Findings suggest some measures in interventions, prevention, and policies in promoting positive peer relations. Some social skill trainings are needed for children to react appropriately in peer relations and get along with their peers. In addition, there is a need for differentiation of the intervention programs by participants' roles in bullying situations and gender of children. Moreover, a longitudinal research is required to enhance the understanding of developmental changes in peer relations.