• Proceedings of the Korean Society of Computer Information Conference
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• 2019.07a
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• pp.97-98
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• 2019

본 논문에서는 대용량의 방송 콘텐츠를 전송하기 위해 다수개의 채널을 결합하여 안정적이고 고속으로 전송하기 위한 방송콘텐츠를 전송하기 위한 테스트베드를 제안한다. 제안하는 테스트베드의 첫 번째 목적은 하나의 방송채널 용량을 초과하는 대용량 방송 콘텐츠를 다수개의 채널을 결합하여 전송하기 위한 것이며, 두 번째 목적은 다채널로 입력된 데이터를 다양한 방법의 병렬 알고리즘을 적용하여 FPGA에 적용한 후 그 결과를 테스트하기 위한 것이다. 이를 위하여 제안하는 테스트베드는 다채널을 위한 입력 보드와 전반적인 제어를 위한 CPU 보드, 병렬 알고리즘 등을 테스트하기 위한 FPGA 보드, 그리고 3개의 보드들을 연결하기 위한 베이스 보드로 구성되었다. 제안하는 테스트베드 환경에서 다채널 대용량의 데이터를 병렬처리 할 수 있는 병렬 알고리즘들을 지속적으로 개발하고 테스트하여 다채널 대용량의 실시간 처리가 가능한 영상처리 시스템을 개발하는 것이다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.7
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• pp.1618-1626
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• 2013

Virtualization service processes all operation including the data creation, storing, and disposal in a server and transmits processed data as the streaming media form. Therefore, client can use the same environment as the traditional desktop environment without considering the type of device. Virtualization service should consider not only the video quality but also the delay bounds and continuity of video playback for improving the user perceived Quality of Service(QoS) of streaming service. In this paper, we propose a network-adaptive transmission architecture that focuses on guaranteeing QoS requirements for virtualization service. In order to provide those, the proposed architecture have the transmission rate adaptation function based on available bandwidth and the content bit-rate control function based on sender buffer state. Through each function, proposed architecture guarantee the delay bounds and continuity of virtualization contents playback. The simulation results show that proposed network-adaptive transmission architecture provides a improve performance of throughput and transmission delay.

• The Journal of the Korea Contents Association
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• v.21 no.8
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• pp.10-19
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• 2021

In CCVN, the existing content search and delivery protocols based on single-hop or multi-hop cause low content search ratio and high network traffic overhead. This paper proposes a RSU-based protocol for efficient content search and delivery. In the proposed protocol, an RSU chooses the candidate provider vehicle that provides the cost-minimized content delivery to the content requester vehicle. Simulation results verify that the proposed protocol achieves better performances.

• Journal of Digital Convergence
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• v.16 no.1
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• pp.271-279
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• 2018

Various technologies have been developed to more efficiently share content such as P2P and CDN. These technologies take a common approach that request packets are responded by distributed network nodes, not by a single distributor. Such approaches not only resolve network congestion around content distributors, but also make it possible to distribute content regardless of the system and network status of content distributors. However, when receiving content from distributed nodes/hosts, not from authenticated distributors, users cannot practically identify which node/host sent content to them. Due to this characteristic, various hacking caused by the malicious modification of content is possible. Therefore, to make such approaches more secure, a content authentication technique is required. In this paper, we propose a improved operation of MHT used in CCN for authenticating distributed content. Then we evaluate the proposed method by comparing its performance with the existing technology.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39B no.6
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• pp.406-413
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• 2014

In recent years, various contents traffics are increasing according to the various internet connectable devices which have become contents provider. Because these contents traffics show different pattern from previous one, many researches for efficient contents delivery system are in progress. CCN(Contents Centric Network), one of the representative research subject, has inter operation problem with a current network because it has clean-state architecture. In this point of view, this paper suggests the SaNA(Service adaptive Network Architecture) for efficient contents delivery when it inter operates with current network architecture. SaNA is a convergence system which can be gradually applied to current network using CCN and SDN(Software Defined Network) which are core future internet technologies. Appling this system on the contents delivery service, it can increase the network bandwidth utilization by two times and decrease the contents delivery time by 1.7 times.

• The KIPS Transactions:PartB
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• v.12B no.2 s.98
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• pp.167-172
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• 2005

A rapid growth in the number of Internet users and in massive media contents tends to cause server overload and high network traffic. As a consequence, it can be safely assumed that the quality of service is on the brink of deterioration. A solution of this problem is the development of the Content Distribution Network. Therefore, in this paper, we propose a transmission model using CDN. This model uses regional media server which closes to client, and uses MDC coding and multi-channel to reduce packet loss and delay. In conclusion, this study improved performance of multimedia service by reducing packet loss and delay.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06d
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• pp.58-60
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• 2012

스마트 TV 및 스마트 셋톱박스와 같은 가정내의 고정형 스마트 기기에 대한 관심이 증가하고 있으며, 이러한 기기는 가정의 미디어 서비스를 제어하는 콘텐츠 허브로 발전하고 있으며, 홈 플랫폼의 포괄적 개념으로 정의할 수 있다. 이러한 홈 플랫폼은 IPTV, 지상파, 케이블, 및 위성 등의 다양한 방송 콘텐츠를 수용할 수 있으며, 모바일 단말 등의 외부 기기와의 연동을 통해 다양한 형태의 콘텐츠에 대해서 접근이 가능하다. 이와 관련하여 실제 서비스 제공이 가능한 기술은 방송 콘텐츠와 시간적으로 연계된 부가정보를 사용자의 모바일 단말에서 제공해 주는 서비스 기술이다. 또, 가정내의 홈 플랫폼을 통해 접근 가능한 다양한 방송 및 콘텐츠 부가정보를 통합적으로 취합하여 하나의 콘텐츠 가이드를 생성하고, 이를 개인 모바일 단말로 전송하여 사용자의 콘텐츠 소비 만족도를 보다 향상할 수 있는 기술에 대한 관심 역시 증가하고 있다. 본 논문에서는 홈 플랫폼에서 방송 수신 정보, 로컬 콘텐츠 및 모바일 단말의 저장 콘텐츠 정보를 기반으로 부가정보를 정합하여 ECG를 생성하고, 이를 모바일 단말에 전송하여 콘텐츠 서비스를 제공하는 플랫폼을 설계하고, 구현하였다. 통합 ECG 생성을 위한 콘텐츠의 메타데이터는 TV-Anytime 표준을 기반으로 적용되어 플랫폼간 상호 연동성이 확보되도록 하였다.

• Journal of Broadcast Engineering
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• v.24 no.1
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• pp.118-131
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• 2019

In order to provide 8K UHD contents of terrestrial broadcasting with a large capacity, the terrestrial broadcasting system has various problems such as limited bandwidth and so on. To solve these problems, UHD contents transmission technology has been actively studied, and an 8K UHD broadcasting system using terrestrial broadcasting network and communication network has been proposed. The proposed technique is to solve the limited bandwidth problem of terrestrial broadcasting network by segmenting 8K UHD contents and transmitting them to heterogeneous networks through hierarchical separation. Through the terrestrial broadcasting network, the base layer corresponding to FHD and the additional enhancement layer data for 4K UHD are transmitted, and the additional enhancement layer data corresponding to 8K UHD is transmitted through the communication network. When 8K UHD contents are provided in such a way, user can receive up to 4K UHD broadcasting by terrestrial channels, and also can receive up to 8K UHD additional communication networks. However, in order to transmit the 4K UHD contents within the allocated bit rate of the domestic terrestrial UHD broadcasting, the compression rate is increased, so a certain level of image deterioration occurs inevitably. Due to the nature of UHD contents, video quality should be considered as a top priority over other factors, so that video quality should be guaranteed even within a limited bit rate. This requires packet scheduling of content generators in the broadcasting system. Since the multiplexer sends out the packets received from the content generator in order, it is very important to make the transmission time and the transmission rate of the process from the content generator to the multiplexer constant and accurate. Therefore, we propose a variable transmission scheduler between the content generator and the multiplexer to guarantee the image quality of a certain level of UHD contents in this paper.

• KIPS Transactions on Computer and Communication Systems
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• v.1 no.1
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• pp.29-34
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• 2012

Wireless multicast service can be used for video streaming service to save the network resources by sending the same popular multimedia contents to a group of users at once. For better multimedia streaming multicast service, we propose a quality-aware rate adaptation (QARA) scheme for scalable video multicast in rate adaptive wireless networks. In QARA, transmission rate is determined depending on the content's type and users' channel conditions. First, the base layer is transmitted by a low rate for high reliability. That means we provide basic service quality to all users. On the contrary, the transmission rate for enhancement layer is adapted by using channel condition feedback from a randomly selected node. So, the enhancement layer frames in a multimedia content is sent with various transmission rates. Therefore, each node can be provided with differentiated quality services. Consequently, QARA is capable of serving heterogeneous population of mobile nodes. Moreover, it can utilize network resources more efficiently. Our simulation results show that QARA outperforms utilization of the available transmission rate and reduces the data transmission time.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2005.11a
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• pp.155-158
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• 2005

본 논문에서는 대화형 기능을 가지는 MPEG-4기반의 멀티미디어를 IP 네트워크를 통해 전송할 수 있는 대화형 멀티미디어 스트리밍 시스템을 제안한다. 제안한 대화형 멀티미디어 시스템은 MPEG-4 콘텐츠를 분석, 전송할 수 있는 스트리밍 서버와 전송되는 MPEG-4 콘텐츠를 수신, 재생할 수 있는 클라이언트, 그리고 효율적인 멀티미디어의 전송을 위해 도입한 오버레이 네트워크로 구성된다. 오버레이 네트워크는 실제 IP 네트워크 상에 콘텐츠를 중계하는 릴레이 노드와 릴레이 노드들을 관리하는 네트워크 분배 관리자로서 구성된다.