• ETRI Journal
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• 제26권5호
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• pp.452-466
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• 2004

As the number of broadcasting channels and programs increases rapidly, the importance of personalized service has been emphasized. In this paper, we propose a practical framework of metadata broadcasting to provide personalized service according to user preferences and various terminal/network conditions. First, we present an overall system architecture of a metadata broadcasting system and then propose several core technologies (particularly in the parts of metadata authoring, metadata encoding, and metadata-based personalized content consumption). For interoperability, the proposed solution is designed to be compliant with the relevant standards of the TV-Anytime Forum, MPEG-7 Systems, and MPEG-2 Systems. Considering a home network environment, we also propose a metadata-based content adaptation scheme. Each component technology has been implemented individually, integrated into an end-to-end prototype broadcasting system, and successfully tested with a set of personalized service scenarios that are also developed in this study.

• 한국도서관정보학회지
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• 제35권2호
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• pp.415-436
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• 2004

본 연구에서는 크게 다음과 같은 두 가지 목적을 갖고 있다. 첫째, 지식경영과 지식관리시스템에 대한 이해를 바탕으로 방송사의 지식경영 및 지식관리시스템 도입을 제안하고, 방송사에 적합한 하부시스템을 갖춘 통합지식관리시스템 구축 모형을 제안하고자 한다. 둘째, 조직의 지식관리시스템 설계와 개발을 위한 방법론으로 팀 기반 접근에 대하여 설명하고 지식관리시스템 구축 프로젝트 과정에 대하여 자세하게 제시하고자 한다. 본 논문에서는 방송사의 지식관리시스템 구축에 목적을 두고 이를 위해 6개 방송사의 웹 사이트를 비교 분석을 하였다. 그리고 방송사에 관한 자료 수집 및 현황분석을 토대로 방송사의 지식관리시스템을 5가지의 하부시스템인 (1)방송기술지원시스템, (2)방송컨텐츠시스템, (3)고객관리시스템, (4)열사네트워크시스템, (5)인사 관리시스템을 포함한 통합관리시스템의 모형을 제안하였다. 한편, 본 연구에서 사용한 팀 기반 접근법은 다른 조직의 지식관리시스템 구축에도 적용 가능하다고 본다.

• 스마트미디어저널
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• 제6권1호
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• pp.54-60
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• 2017

최근 방송사는 인터넷, 케이블 TV, DMB(Digital Multimedia Broadcasting) 등으로 대표되는 뉴미디어의 등장이라는 사회적 환경 변화와 방송통신 융합이라는 정책적 환경 변화를 겪고 있다. 이러한 변화를 극복하기 위해, 방송사는 새로운 방송정보시스템 구축에 많은 관심을 보이고 있다. 본 연구는 중소 규모의 방송사에 적합한 웹 기반 방송정보시스템의 개발 과정을 제시한다. 이를 위해 시스템 구성도, 업무기능 관계도, 업무흐름도, 개체관계성도, 주요 프로그램, 사용자인터페이스 등을 기술한다. 본 연구에서 제시된 웹 기반 방송정보시스템은 사내외에서 신속한 의사결정과 업무처리를 가능하게 하여 업무 생산성을 제고할 것으로 기대된다.

• Journal of Communications and Networks
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• 제12권6호
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• pp.558-567
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• 2010

In this paper, we analyze the capability of satellite broadcasting systems to offer different levels of quality of service (QoS). We focus on the European telecommunications standards institute satellite digital radio and digital video broadcasting satellite handheld (DVB-SH) standards, which have recently been proposed for satellite broadcasting communications. We propose a strategy to provide different levels of QoS for the DVB-SH standard on the basis of an extension of the interleaving scheme, referred to as molded interleaver, which supports low latency service requirements for interactive services. An extensive analysis based on laboratory measurements shows the benefits of this solution. We also present a multilevel coding (MLC) scheme with multistage decoding designed for broadcasting communications as an alternative to the existing standards, where services with different levels of QoS are provided. We present a graphical method based on mutual information for the design and evaluation of MLC systems used for broadcasting communications. Extensive simulations for a typical satellite channel show the viability of the proposed MLC scheme. Finally, we introduce multidimensional constellations in the proposed MLC scheme in order to increase the number of different protection levels.

• 방송공학회논문지
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• 제9권1호
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• pp.32-42
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• 2004

본 논문에서는 다중 송/수신안테나를 가지는 시공간 블록 부호를 ATSC (Advanced Television Systems Committee) 지상파 방송 시스템에 적용하는 방법을 다루며, 특히, 2개의 송신 안테나와 다수의 수신안테나를 가지는 Alamouti의 구조를 ATSC 방송 시스템에 적용해 본다. 또한, 다중 수신안테나를 가지는 다이버시티 기법과 다중 송/수신안테나를 가지는 시공간 블록 부호의 구조를 비교해 본다. 전산 실험에 의하면. 다중 송/수신안테나를 가지는 ATSC 방송 시스템은 단일 송/수신안테나를 가지는 방송 시스템보다 Rayleigh 페이딩 채널 환경에서 매우 우수한 성능을 가진다.

• Journal of Communications and Networks
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• 제7권2호
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• pp.135-143
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• 2005

This paper presents an investigation of satellite radio access technology for beyond IMT-2000 systems. Although we could not see any active role of a satellite system in the 3G networks, satellite system will provide strong advantages in future systems for certain applications. Because a satellite link has longer round trip delay than a terrestrial link, we need technologies that would make the satellite component especially efficient. After presenting the satellite radio interface of the 3G system, we suggest several points which need to be considered in the beyond 3G systems. We also suggest a few candidate technologies with various simulation results.

• ETRI Journal
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• 제28권5호
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• pp.583-592
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• 2006

Digital broadcasting technology has developed focusing on multi-channel/multi-media, high-definition quality, and mobility-support. Recently, there has been a clear trend toward bidirectional service with the convergence between broadcasting and communication. The broadcasting viewer is no longer simply a passive receptor but has also become an information generator. Currently, the digital multimedia broadcasting (DMB) specifications are the major standard for portable digital broadcasting and have been establishing the overall guidelines for bidirectional service using the MPEG-4 system. While detailed specifications for DMB systems are not well-established for bidirectional service yet, they share the basic concepts underlying the European Eureka-147 Digital Audio Broadcasting (DAB) system. This paper develops key scenarios for bidirectional service in DMB, describes the signal transaction of broadcasting and return channels, and demonstrates typical scenarios using binary format for scenes (BIFS) in the MPEG-4 system.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권12호
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• pp.5981-5997
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• 2017

Advanced Television Systems Committee (ATSC) produced ATSC 2.0 standard, which has been used for a HD/SD digital broadcasting service with MPEG-2 Transport Stream (TS) as a delivery protocol. Recently, users might want to consume multimedia services without being constrained by transport network. However, MPEG-2 TS is not suitable protocol for IP network. Thus, ATSC has enacted ATSC 3.0 standard, which is designed for a hybrid service through a conversion of both broadcasting and broadband channels. The ATSC 3.0 specifies delivery protocols as MPEG Media Transport (MMT) for a broadcasting environment and Dynamic Adaptive Streaming over HTTP (DASH) for a broadband. However, it seems difficult to combine broadcast and broadband for hybrid broadcasting, and it is difficult to synchronize media data between MMT and DASH. This paper suggests various new service scenarios to be brought up by a hybrid broadcasting, ATSC 3.0, and also proposes a stable mechanism for switching contents between different delivery protocols such as MMT and DASH.

• 한국정보시스템학회지:정보시스템연구
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• 제14권3호
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• pp.59-62
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• 2005

The recent broadcasting environment has shifted to embrace multimedia and multi-channel features through terrestrial, satellite and cable media. This has multiplied the number of broadcasting programs. With the information on a myriad of programs provided to TV viewers, information overload occurs, and thus, the TV viewing environment is shifting to one where viewers cannot select programs passively. Thus, a growing need is emerging to ensure a personalized electronic program guide (EPG) to help individuals select TV programs according to their taste. This paper presents a personalized EPG that enables a purpose-oriented broadcasting service to provide personalized broadcasting programs in tune with the user's requirements and preferences.

• 한국인터넷방송통신학회논문지
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• 제9권6호
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• pp.175-185
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• 2009

본 논문에서는 위성 방송 채널에서 터보 부호화된 OFDM 시스템의 성능을 분석 및 실험하였다. 성능은 BER로 평가하였고, 위성 채널은 Rayleigh 페이딩과 Rician 페이딩의 조합으로 모델링 된다. 성능 비교를 위해 터보복호 알고리즘으로 MAP, Max-Log-MAP, SOVA가 사용되었다. 모의실험 결과, Max-Log-MAP 알고리즘이 성능과 복잡도 측면에서 가장 좋은 성능을 보임을 확인 하였다. 그리고 터보 부호화기의 iterations과 interleaver의 수를 증가시키면 성능이 향상됨을 알 수 있다. 본 논문의 결과는 OFDM 기반의 위성 방송 시스템의 설계에 활용될 수 있다.