• Journal of Digital Contents Society
• /
• v.8 no.3
• /
• pp.403-410
• /
• 2007

The P2P(Peer to Peer) business, which has brought the great wave all over the world, was made possible as a user's environment is getting improved through the introduction of high-tech PC, and the access service of high-speed internet. P2P is the form that anyone using computer could be both a provider and a user by searching or connecting to the personal computer each other out of the concept of server and client. In other words, it is the system made by the technique which could share the data connecting between the PC of the person with the information and the person searching the information. Recently a various system of P2P is under the development which could be applied to the electronic commerce among the companies which is not only the file share among the individuals. In this paper, we propose the more effective electronic business system making use of P2P.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2010.10a
• /
• pp.411-413
• /
• 2010

Now, smart phone markets are grows quickly. So it is needed research of CDN(Contents Delivery Network) technology for contents transmission in mobile networks. Especially the services of smart phone are focused on open platform model. So P2P(Peer to Peer) protocols will be used for mobile network because it is a distributed network architecture composed of participants that make a portion of their resources directly available to other network participants, without the need for a central server. Current research of P2P protocols for mobile network are not activated. The reason is appropriate in the mobile P2P network simulation environment, since it is not provided. So, in this paper we design a mobile P2P simulation system for CDN based on mobile P2P.

• Journal of Korea Society of Digital Industry and Information Management
• /
• v.6 no.3
• /
• pp.37-47
• /
• 2010

In this paper, we propose an UCC broadcasting system in P2P based IPTV environments. Proposed system applies P2P based multiple chain architecture. UCC broadcasting system transfers data from not ISP server but UCC server peer that is included in DSLAM to joined peers. Therefore an algorithm to manage join and departure of peers have to modified. In this paper we propose an algorithm that does not increase an uplink bandwidth of DSLAM that include UCC server when peer joins to the UCC channel. We will show the improved performance of proposed scheme rather than general method with respect to the uplink bandwidth of DSLAM that include UCC server.

• Journal of the Institute of Electronics and Information Engineers
• /
• v.52 no.1
• /
• pp.40-47
• /
• 2015

We propose a method to provide a selective VoD service during live streaming sessions. In the proposed method, each peer joined the live streaming session receives video stream packets with P2P manner and stores the packets to provide a VoD service. To mitigate the overhead of each peer node to store the video stream packets, the proposed scheme categorizes peers into three different groups based on their link types. To increase data gathering speed and reduce the network load, we also proposes the P2P transmission scheme within the same AP network for the peers with Wi-Fi link. To evaluate the performance of the proposed method, we implement computer simulator using NS-3. Simulation results show that the proposed method reduces the overhead about 66% and increases the P2P data gathering speed about 50% compared to the conventional schemes.

• Proceedings of the Korean Information Science Society Conference
• /
• 2001.10a
• /
• pp.127-129
• /
• 2001

현재 서비스되고 있는 주요 P2P 솔루션들은 파일 공유, 전자상거래 등의 단일 서비스 위주로 구성되어 있으며, 이를 위한 저장소 또한 솔루션에서 제공하는 서비스 위주로 설계되어 있다 그러나, 향후 P2P 네트워크상에 전자상거래, 지식공유, Collaboration 등의 여러 서비스를 동시 구현하기 위해서는 다양한 환경 및 서비스를 지원할 수 있는 인프라와 이러한 요구사항에 따른 개선된 저장소를 필요로 한다. 본 논문에서는 다양한 서비스의 구현이 용이하며, PC, 웹, 모바일 환경에서 연동이 가능하도록 지원하는 XML 기반 Global Peer-to-Peer 엔진(글로벌 P2P 엔진)의 저장소 설계에 대하여 다룬다. 본 논문에서 제안하는 저장소는 P2P 네트워크를 이용한 스토리지 공유 기능을 지원한다. 이를위하여 저장매체에 대해 투명성을 제공하도록 메모리, 디스크의 데이터에 직접 억세스 하는 스토리지 인터페이스를 설계하였으며, 멀티미디어 등의 공유 컨텐츠에 대한 메타데이터를 XML로 구성하고 관리하는 기능을 설계함으로써 효율적인 검색이 가능하도록 하였다. 본 논문에서 제안한 P2P 엔진의 저장소 설계로 구현될 P2P 서비스는 XML을 이용한 이기종 플랫폼간에 데이터를 교환할 수 있으며, 여러 종류로 구성된 데이터의 효율적인 검색 방법과 피어간 디스크 공유 기능을 지원할 수 있을 것이다.

• Journal of Information Technology Services
• /
• v.2 no.2
• /
• pp.53-62
• /
• 2003

Current P2P (Peer-to-Peer) applications have the limited functions such as file search and transfer between peers and have the limitations such as trust problem on search results, copyright problem, and profitable business model problem. For a P2P application to be used as a business platform for the distribution of various multimedia contents, this paper proposes an extended P2P application architecture and its prototype system including distributed collaborative filtering, automated price negotiation system, and payment mechanism.

• Proceedings of the Korean Information Science Society Conference
• /
• 2002.10e
• /
• pp.460-462
• /
• 2002

컴퓨터 네트워킹의 새로운 패러다임으로 떠오르고 있는 P2P(Peer-to-peer)통신은 기존의 서버-클라이언트 모델의 한계점을 극복하는 많은 해법을 제시하고 있다. 이에 최근여러 가지 플랫폼의 각기의 서비스를 제공하는 애플리케이션들이 속속 등장하고 있다. SunMicro systems에서 시작되어 현재 Open Project로 진행중인 Project JXTA는 이러한 분산 Computing, 특히 Peer-to-Peer Computing이나 Peer-to-Peer 네트워킹이라는 영역에서 폭넓게 발생하는 문제를 해결하기 위해 만들어진 테크놀로지로서 Peer to Peer를 비롯한 분산 Computing들을 위한 Infra Service를 제공하고 있다. JXTA 테크놀로지를 이용하여 제공할 수 있는 여러 서비스 중에 일반 Peer들의 대용량 데이터 전송에서 있을 수 있는 문제점을 해결할 수 있는 서비스를 제안한다. 대용량의 데이터를 여러 서버에서 나누어 받을 수 있도록 하여 Peer-to-Peer 어플리케이션에서 사용자는 찾고자 하는 자료를 검색했을 때 자료의 위치와 함께 제공자의 status와 capability를 monitoring 함으로써 실제 제공할 수 있는 또는 제공하고자 하는 속도와 다운받을 서버와 가져올 데이터의 용량을 결정함으로써 대용량 데이터를 단시간에 효율적으로 주고받을 수 있다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2005.07b
• /
• pp.13-15
• /
• 2005

P2P(Peer-to-Peer) 시스템은 대용량의 데이타를 공유하는데 유용하며, 네트워크 구조에 따라 중앙 집중형, 구조적 분산형, 그리고 비구조적 분산형으로 분류된다. 이 중 Gnutella와 같은 비구조적 분산형 P2P 시스템은 확장성과 신뢰성 측면에서 장점을 갖지만, 참여하는 노드의 수가 증가함에 따라 원하는 자원을 액세스하는 비용도 증가하는 문제를 가진다. 데이터 중복을 이용해 이러한 문제를 해결할 경우 중복된 데이타들의 일관성 유지를 위한 기법이 필요하다. 본 논문에서는 특정 노드가 갱신한 데이타를 중복된 사본을 저장하고 있는 다른 노드에 전파하기 위한 하이브리드 push/pull 기반의 갱신 전파 기법을 제안한다.

• English Language & Literature Teaching
• /
• v.15 no.2
• /
• pp.151-168
• /
• 2009

The present study investigates the impact of trained peer feedback on the quantity and quality of revisions made by EFL students at a low-intermediate level. Peer review training was carried out in experimental group through four in-class training sessions and four peer dyad-instructor conferences after class. Students' $1^{st}$ drafts with written peer feedback and revised drafts prior to and post training were collected and analyzed. Results reveal that after training the students produced more revisions in response to their peer comments (96% of total revisions) and those revisions were counted as enhanced in quality (93% of peer-triggered revisions). In contrast, the results of paired t-test within control group indicate that there was no significant difference between two data collected from week 3 and week 16 (t = -.57, df =19, p = .577 at p < .05). The findings suggest that training as an ongoing process of teacher intervention contributes to effectiveness of the peer feedback activity. The study provides pedagogical implications for how to structure and implement peer review training for the sake of its direct strength in an EFL writing class.

• The Journal of the Korea Contents Association
• /
• v.17 no.1
• /
• pp.662-672
• /
• 2017

Recently, with the development of mobile devices and near field communication, mobile P2P networks have been actively studied to improve the limits of the existing centralized processing system. A peer has limited components such as batteries, memory and storage spaces in mobile P2P networks. The trust of a peer should be discriminated in order to share reliable contents in mobile P2P networks. In this paper, we propose a trust discrimination scheme considering limited resources in mobile P2P environments. The proposed scheme discriminates the trust of a peer by direct rating values using the rating information of the peer and indirect rating values by the other peers. The recent update time is included in the rating information. The proposed scheme reduces the redundant rating information by comparing the recent update times of the rating information. It is shown through performance evaluation that the proposed scheme reduces the number of messages and improves the accuracy of trust over the existing scheme.