• Journal of Communications and Networks
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• 제10권4호
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• pp.422-429
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• 2008

Mobile peer-to-peer (P2P) systems have recently got in the limelight of the research community that is striving to build efficient and effective mobile content addressable networks. Along this line of research, we propose a new peer-to-peer file sharing protocol suited to mobile ad hoc networks (MANET). The main ingredients of our protocol are network coding and mobility assisted data propagation, i.e., single-hop communication. We argue that network coding in combination with single-hop communication allows P2P file sharing systems in MANET to operate in a more efficient manner and helps the systems to deal with typical MANET issues such as dynamic topology and intermittent connectivity as well as various other issues that have been disregarded in previous MANET P2P researches such as addressing, node/user density, non-cooperativeness, and unreliable channel. Via simulation, we show that our P2P protocol based on network coding and single-hop communication allows shorter file downloading delays compared to an existing MANET P2P protocol.

• 융합신호처리학회 학술대회논문집
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• 한국신호처리시스템학회 2000년도 추계종합학술대회논문집
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• pp.9-12
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• 2000

본 논문은 leaky bucket을 이용하여 초고속망의 폭주를 제어하는 Advanced Peer-to-Peer Network(APPN)의 성능을 분석하였다. 제안된 논문에서는 손실 및 오류패킷에 대하여 재전송하는 오류제어 방식을 병행하여 사용하였다. APPN 모델의 성능 분석을 통하여 사용자 차원의 오류제어와 망 차원의 폭주제어 방식간의 상호작용을 연구하여 윈도우 크기와 leaky bucket의 토큰 생성속도가 end-to-end delay에 영향을 미치는 중요한 파라미터들임을 알 수 있었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
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• pp.384-387
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• 2003

In this paper, we have designed the integrated wire and wireless P2P framework using mobile agents to share efficiently resources as media file. Most of the P2P applications are used on the wire network. We propose the integrated wire and wireless P2P framework. Proposed P2P platform is based on JXTA of Sun Microsystems. But JXTA is pure peer-to-peer network model, so it sends message other peers as broadcast style to request resources. In this way, there are some problems as massage overload, bandwidth loss, etc. In order to solve this problem, we propose a hybrid peer-to-peer network model using mobile agent. Proposed scheme also solve existing hybrid pEp model's flaws which have the delay and low rate due to concentrated server. In proposed scheme, mobile agents that have autonomy and mobility are used to search the location of resources. Besides, mobile agents could solve the loss problem of the search result. To improve P2P QoS(Quality of Service), we could monitor peer's state information using PIP(Peer Information Protocol) of JXTA.

• 아동학회지
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• 제36권2호
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• pp.17-37
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• 2015

The study examined the pathways from maternal reactions to children's negative emotions to children's peer relations through children's empathy and emotional regulation. The participants in this study comprised 463 elementary school 4th-6th graders. They completed questionnaires on maternal reactions to children's negative emotions, levels of children's empathy, maladaptive emotion regulation types and skill levels of children's peer relations. Data were analyzed by means of structural equation modeling. It was found that in the case of maternal emotion coaching reactions, when done indirectly, as well as directly, had an influence on their levels of peer relations. On the other hand, in the case of over-sensitive maternal reactions, when done indirectly, but not directly, had an influence on their levels of peer relations. Therefore, these results indicate that children's empathy mediated the effects of maternal emotion coaching and over-sensitive reactions on peer relations. It also found that there are distinct pathways from maternal reaction types to children's negative emotions to peer relations through empathy and maladaptive emotion regulation types.

• 공학교육연구
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• 제19권5호
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• pp.3-12
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• 2016

This paper aims to apply two ways of student evaluation, i.e. peer- and self-evaluation to TBL(team based learning) class and to explore the difference between two evaluations by gender and grade as well as their relationships, and finally to provide an explanation for the improvement of evaluation ways in TBL class. There has been much research about TBL and its related factors. However, according to the examination of both domestic and overseas researches concerning the application of peer- and self-evaluation to TBL class, few studies have focused on them in terms of the engineering curriculum. This study was conducted with 251 engineering students at P University, and peer- and self-evaluation in TBL class have been measured. Our findings show that firstly, there were significant grade differences in self-evaluation of engineering students. Second, there were no significant gender and grade differences in peer-evaluation. Third, we found a significant correlation between the two factors, self- and peer-evaluation. Also there was a significant correlation among variables of subcategories. Based on these findings, it is expected to provide an explanation for the application of peer- and self-evaluation in TBL class and will be useful for the improvement plans of the related courses in engineering school.

• Journal of Korean Medical Science
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• 제33권46호
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• pp.287.1-287.14
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• 2018

Integrity of authorship and peer review practices are important considerations for ethical publishing. Criteria for authorship, as delineated in the guidelines by the International Committee of Medical Journal Editors (ICMJE), have undergone evolution over the decades, and now require fulfillment of four criteria, including the need to be able to take responsibility for all aspects of the manuscript in question. Although such updated authorship criteria were published nearly five years ago, still, many major medical and specialist journals have yet to revise their author instructions to conform to this. Inappropriate authorship practices may include gift, guest or ghost authorship. Existing literature suggests that such practices are still widely prevalent, especially in non-English speaking countries. Another emerging problem is that of peer review fraud, mostly by authors, but also rarely by handling editors. There is literature to suggest that a proportion of such fake peer review may be driven by the support of some unscrupulous external editing agencies. Such inappropriate practices with authorship malpractices or disagreement, or peer review fraud, have resulted in more than 600 retractions each, as identified on the retractions database of Retractionwatch.com. There is a need to generate greater awareness, especially in authors from non-English speaking regions of the world, about inappropriate authorship and unethical practices in peer review. Also, support of any external editing agency should be clearly disclosed by authors at the time of submission of a manuscript.

• International Journal of Computer Science & Network Security
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• 제21권12spc호
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• pp.399-408
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• 2021

Information security reports four types of basic attacks on information. One of the attacks is named as fabrication. Even though mobile devices and applications are showing its maturity in terms of performance, security and ubiquity, location-based applications still faces challenges of quality of service, privacy, integrity, authentication among mobile devices and hence mobile users associated with the devices. There is always a continued fear as how location information of users or IoT appliances is used by third party LB Service providers. Even adversary or malicious attackers get hold of location information in transit or fraudulently hold this information. In this paper, location information fabrication scenarios are presented after knowing basic model of information attacks. Peer-to-Peer broadcast model of location privacy is proposed. This document contains introduction to fabrication, solutions to such threats, management of fabrication mitigation in collaborative or peer to peer location privacy and its cost analysis. There are various infrastructure components in Location Based Services such as Governance Server, Point of interest POI repository, POI service, End users, Intruders etc. Various algorithms are presented and analyzed for fabrication management, integrity, and authentication. Moreover, anti-fabrication mechanism is devised in the presence of trust. Over cost analysis is done for anti-fabrication management due to nature of various cryptographic combinations.

• 한국콘텐츠학회논문지
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• 제20권7호
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• pp.263-273
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• 2020

본 연구의 목적은 중학생의 또래애착이 자존감과 내재적 학습 동기 사이에서 매개효과가 있는지를 확인하는 것이다. 이를 위해 본 연구에서는 전라남도 S시 소재의 남녀 중학생 457명(남학생 225명, 여학생 232명)을 대상으로 자존감, 또래애착, 내재적 학습동기의 수준을 측정하여 자료를 수집하였다. 연구결과는 다음과 같다. 중학생의 자존감과 또래애착, 내재적 학습동기 사이의 상관은 모두 유의하게 나타났다. 자존감은 또래애착과 내재적 학습동기에 유의한 영향을 주었으며, 또래애착도 내재적 학습동기에 유의한 영향을 주었다. 한편 또래애착은 자존감과 내재적 학습동기 사이에서 부분매개효과가 있는 것으로 나타났다. 또래애착의 매개효과는 학년에 따른 다른 양상을 보였다. 본 연구를 통해서 중학생들의 자존감은 또래애착에 영향을 주며, 자존감의 영향을 받은 또래애착은 내재적 학습동기에 영향을 줄 수 있음을 확인하였다. 또한 본 연구의 시사점과 제한점에 대하여 논의하였다.

• 한국콘텐츠학회논문지
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• 제16권9호
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• pp.339-348
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• 2016

본 연구에서는 온라인 또래괴롭힘을 서로 알고 지내는 친구사이에서 SNS를 통하여 발생하는 괴롭힘으로 정의하고 온라인 또래괴롭힘에 영향을 미치는 요인을 파악하고자 하였다. 본 연구는 또래동조성이 높은 초기 청소년기에 해당하는 초등학교 5학년과 6학년 학생 375명을 대상으로 또래동조가 온라인 또래괴롭힘에 미치는 영향을 파악하고 도덕적 이탈의 조절효과를 분석하였다. 조절회귀분석 결과 반사회적 또래동조성이 높아질수록 온라인 또래괴롭힘이 증가하는 것으로 나타났다. 또한 반사회적 또래동조성과 온라인 또래괴롭힘의 관계에 있어 도덕적 이탈이 조절효과를 보이는 것으로 나타났다. 이에 본 연구에서는 온라인 또래괴롭힘에 대한 또래동조의 악효과를 감소시키기 위하여 인성교육을 통한 도덕적 이탈의 감소를 제안한다. 이를 통하여 초기 청소년의 반사회적 또래동조성을 감소시켜 효과적인 온라인 또래괴롭힘을 예방할 수 있을 것으로 기대된다.

• 가정과삶의질연구
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• 제24권5호
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• pp.1-15
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• 2006

This study explored the relationship between children's emotional competence, aggression and peer relationships. Participants were 164 third and 134 fourth grade children from five elementary schools in Seoul and Chenan. Emotional competence, aggression and peer relationships were assessed by means of a questionnaire, interview and observation. Results indicated that emotional understanding of self and others, sex, age, emotional expression and passive regulation strategies were significant variables in predicting children's aggression. Emotional understanding was the most predictable variable in relation to peer relationships. Emotional understanding, emotional regulation and emotional expression made independent contributions to aggression and peer relationships. Mediation analyses revealed that the significant connections between children's emotional competence and negative peer relationships were mostly mediated by aggression.