• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.2
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• pp.131-134
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• 2005

This paper describes the efficient peer-to-peer migration method of Grid service agent on the mobile agent based P-Grid. The migration mechanism for transmitting service agent upon the service request is based on the peer's logic network topology. The network topologies that this system uses are organized as star topology, ring topology and tree topology, and agents are migrated by the master/slave method and serial/parallel method. The migration method of services is chosen based on the execution range and characteristic of the requested service. Also, the entire execution time of service is affected by the performance of peer that is a part of network topology, and the migration order, Therefore, the system monitors the performance of peers, and determines the migration priority based on analyzing and learning history. The system can reduce service execution time efficiently with decisions of migration method for service agent and priority of peers.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.05a
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• pp.573-576
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• 2006

기존의 인폼드 검색 모델에서 자원 보유 피어의 검색 결과는 검색 과정에서 선택된 피어들 각각의 라우팅 결정 정보로 저장되는데, 자원 적중률에 따라 다음 피어를 선택할 때 주요 결정 요인으로 작용한다. 이러한 라우팅 결정 정보를 이용하여 검색 트래픽과 검색 성공률 등의 측면에서 기존의 Random Walks 등에 비해 효과적인 성능 평가 결과를 보인 LTO(Leveled The Orienteering) 검색 알고리즘은 검색 과정에서의 라우팅 경로가 편중되어 있어 해당 노드들에 검색 부하 집중 경향을 보인다. 이에 본 논문에서는 검색 적중 빈도에 다라 LTO 검색 알고리즘이 검색 과정상에서 라우트 대상 노드들의 성능을 고려한 적응적 P2P 검색 알고리즘으로 확장 제안한다. 제안한 알고리즘의 성능 평가 결과 노드들의 검색 부하 집중률과 자원 검색 노드의 검색 성공률 측면에서 적절한 타협점에서 동작함을 확인하였다.

• Proceedings of the Korea Contents Association Conference
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• 2005.11a
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• pp.371-375
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• 2005

Giving service in the web environment, which is the service, service, connected to the database server and receiving data from query causes a problem. It declines the efficiency of down loading and offering server service. Through obtaining data from database cashing or database clustering have used in the researches these days.

• Journal of the Korean Society of School Health
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• v.37 no.1
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• pp.22-32
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• 2024

Purpose: The purpose of this study is to compare sociocultural attitudes toward appearance, appearance satisfaction, and peer relationships between male and female middle school students, and to compare the effects of these variables on self-esteem in students of different genders. Methods: Data were collected in August and September of 2023 and analyzed using SPSS 24.0. Data were collected from 289 male and 240 female students through a survey, and descriptive statistics, x2 test, t-test, Scheffé test, and multiple regression analysis were conducted. Results: Female students showed significantly higher scores for sociocultural attitudes toward appearance (3.06±0.77 vs. 2.82±0.74), significantly lower scores for appearance satisfaction (2.55±0.46 vs. 2.71±0.40), and significantly higher scores for peer relationships (3.46±0.69 vs. 3.00±0.78) than male students. Additionally, self-esteem was significantly lower in female students (2.84±0.59) than in male students (2.95±0.51). As a result of adjusting for weekly allowance, subjective academic achievement, family economic status, stress, and experience of sadness or despair, which were significant in the univariate analysis, self-esteem increased as appearance satisfaction (p for all <.001) and peer relationships increased in both male (p=.009) and female (p<.001) students. In addition, sociocultural attitudes toward appearance did not have a significant impact on self-esteem in both male and female students. Among general characteristics, weekly allowance, subjective academic achievement, and stress were found to have a significant effect on self-esteem in both genders. Relationships with parents had a significant effect on self-esteem only in male students, and experience of sadness or despair had a significant effect only in female students. Conclusion: In order to improve self-esteem in both boys and girls, appearance satisfaction and peer relationships should be improved. As boys with poor relationships with their parents and girls with high levels of sadness or despair are particularly likely to have low self-esteem, they are to be considered as a high-risk group.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06d
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• pp.370-374
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• 2007

현재 컴퓨팅은 하나의 개인 컴퓨터에서 이런 개인 컴퓨터들이 하나로 묶인 네트워크 컴퓨팅 형태로 발전 되었고, 앞으로 더욱 네트워크 컴퓨팅 중심으로 발전될 것은 자명한 사실이다. 그 가운데 인터넷과 더불어 P2P(Peer-to-Peer) 시스템이 발전되었다. 인터넷을 중심으로 정보통신 분야는 눈부신 발전을 하였지만, 이제 인터넷을 통한 발전도 한계를 맞고 있다. 너무 많은 정보 가운데 사용자가 원하는 정보를 어떻게 찾을 것인가란 문제를 두고 현재 시멘틱 웹[1]을 제시하여 이를 해결하고자 하는 노력들이 있다. 이러한 문제점은 P2P 시스템에서도 동일하게 나타난다. 이를 해결하고자 시멘틱 웹의 요소인 RDF(Resource Description Framework)[2]를 이용한 P2P 시스템[3][4]이 제안되었다. 하지만 DHT(Distributed Hash Table)를 이용한 P2P 시스템의 특성상 연관된 자료라도 어디에 배치될지 알 수 없다. 이러한 특성을 가진 시스템에서 Range Query를 하는 것은 P2P 시스템이 가진 문제였고, 이를 해결할 한 가지 방법을 여기에서 제안한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.6
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• pp.256-265
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• 2020

The purpose of this study was to develop and explore the effectiveness of a peer-leadership program on the recovery of people with mental illness. To develop the program, a literature review and an analysis of developed programs were performed.Brown's recovery framework was applied, including an understanding of mental illness, self-leadership, empowerment, and self-directed action plans. A program was developed (6 sessions over 3 days) including peer-led activities, disability awareness and perception, and recovery action plans. The program consisted of education, understanding, planning, and implementation. Its focus was on recovery-oriented activities for empowering people with mental illness. Twenty people with mental illness and using mental rehabilitation centers participated in the program. Four scales (i.e., stigma, empowerment, leadership, and disability awareness) were used for the pre-post analysis. The study results showed statistically significant differences in the participants' levels of stigma (p< .05), empowerment (p < .05), leadership (p< .01), and disability awareness (p< .05) after completing the program. These findings suggest that the peer-leadership program is a recovery program that includes increased understanding of mental illness, empowerment, and leadership capability. Discussions and suggestions were provided for a future study based on the results.

• The Journal of Korean Academic Society of Nursing Education
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• v.20 no.3
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• pp.372-381
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• 2014

Purpose: This study aims to investigate the effects of a peer gatekeeper training program on existential spiritual well-being, interpersonal relationship with friends, and suicide probability for middle school students. Methods: The participants were fifty students who were at a vocational middle school in D city from october 13, 2012 to november 10, 2012. To test the effects of the peer gatekeeper training program, the participants were divided into two groups in the way of matching distribution, an experimental group(24) and a control group(26). Data were analyzed by Chi-square test, t-test, and Fisher exact probability test using the SPSS/WIN 12.0 program. Results: After attending the peer gatekeeper training program, significant differences between the experimental group and the control group were found in existential spiritual well-being(t=2.80, p=.007) and interpersonal relationship with friends scores(t=2.67, p=.010). However, there was no statistically significant difference in suicide probability between the two groups. Conclusion: The results indicate that the peer gatekeeper training program enhance existential spiritual well-being and interpersonal relationship with friends of middle school students. Therefore, this program could be a good strategy that teachers and community mental health nurses can use for suicide prevention of middle school students.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.1393-1396
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• 2008

P2P프로그램에 대한 연구는 정보공유 및 성능 향상을 초점으로 많은 연구가 진행되어 왔다. 그러나 P2P프로그램의 정보유출 문제에 대한 원인분석 및 대응방안에 대한 연구는 미비한 실정이다. 일본은 2004년부터 P2P프로그램을 통한 정보유출 사건이 빈번히 발생하고 있다. 이와 같은 이유로 본 연구는 일본의 P2P프로그램을 통한 정보유출 현황, 원인, 대응방안을 연구했다. 정보유출 현황을 조사하기 위해 정보유출에 관련된 언론기사를 수집했고, 일본 P2P프로그램으로부터 유출되고 있는 정보를 30개월간 수집했다. 정보유출 원인을 이해하고 대응방안을 파악하기 위해서 일본 P2P프로그램의 사용현황, 정보유출 사례, 정보유출 원인, 일본 정부·기관·기업·군의 대응방안을 조사하고 분석했다. 유출된 정보를 수집한 결과 개인 신상정보, 기업, 관공서, 군 등의 내부 자료를 수집할 수 있었으며, 유출 정보로 인한 사회적 심각성을 이해할 수 있었다. 또한 일본 민·관·군의 정보유출 대응방안이 실효성을 거두고 있는가를 검증하기위해서 유출정보를 지속적으로 수집하였다. 그 결과 대응방안 적용 시점부터 유출정보가 급격히 감소했음을 확인했다. 이러한 연구 결과는 타 국가의 P2P프로그램을 통한 정보유출 대응방안수립에 도움이 될 것이다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.6 no.10
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• pp.2731-2749
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• 2012

Sybil attack has been proved effective in mitigating the P2P botnet, but the impacts of some important parameters were not studied, and no model to estimate the effectiveness was proposed. In this paper, taking Kademlia-based botnets as the example, the model which has the upper and lower bound to estimate the mitigating performance of the Sybil attack is proposed. Through simulation, how three important factors affect the performance of the Sybil attack is analyzed, which is proved consistent with the model. The simulation results not only confirm that for P2P botnets in large scale, the Sybil attack is an effective countermeasure, but also imply that the model can give suggestions for the deployment of Sybil nodes to get the ideal performance in mitigating the P2P botnet.

• The Journal of Asian Finance, Economics and Business
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• v.7 no.7
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• pp.85-93
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• 2020

In peer-to-peer (P2P) loan markets, as most lenders are unskilled and inexperienced ordinary individuals, it is important to know the characteristics of borrowers that significantly impact their repayment performance. This study investigates the effects and importance of borrowers' past repayment performance track record within the platform to identify its predictive power. To this end, I analyze the detailed loan repayment data from two leading P2P lending platforms in Korea using a Cox proportional hazard, multiple linear regression, and logit models. Furthermore, the predictive power of the factors proxied by borrowers' track records are evaluated through the receiver operating characteristic (ROC) curves. As a result, it is found that the borrowers' past track record within the platform have the most important impact on the repayment performance of their current loans. In addition, this study also reveals that the borrowers' track record is much more predictive of their repayment performance than any other factor. The findings of this study emphasize that individual lenders must take into account the quality of borrowers' past transaction history when making a funding decision, and that platform operators should actively share the borrowers' past records within the markets with lenders.