• Journal of Broadcast Engineering
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• v.13 no.4
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• pp.440-451
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• 2008

With the advent of IP-based multimedia service based on IP network, there is a rapidly increasing demand for IPTV. Unlike the previous coaxial cable based TV, IPTV provides a variety of convergence services based on IP newark. However, since the IPTV service quality is a lot affected by the network degradation such as packet loss and jitter, it may not be guaranteed. In this paper, we propose an objective measure for various degradations of IPTV-based videos considering subjective assessment. To this end, we first determine QoE(Quality of Experience) indicators, which can affect human visual perception. Then we develop the video quality metric for each QoE indicator. Subjective assessment based on MOS is conducted and used to construct mapping relationship between each measure and perceived visual quality. Experiments are performed on various videos to confirm the efficiency and robustness of the proposed method and show high correlation with subjective assessment.

• Electronics and Telecommunications Trends
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• v.21 no.6 s.102
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• pp.104-112
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• 2006

보편적으로 확산된 IP 네트워크를 기반으로 신규 사업모델을 창출하기 위한 IPTV 서비스가 전세계적으로 추진되고 있다. 또한, 고품질 IPTV 서비스 제공을 위하여 특히FTTH를 포함한 가입자망의 광대역화가 빠르게 이루어지고 있다. IPTV 서비스는 통신서비스와 방송서비스의 융합을 특징으로 하며, IPTV 서비스가 제공되기 위해서는 다양한 IP 네트워크 기술, 방송 AV 기술, 서비스제어 기술, 콘텐츠 보호 기술들이 복합적으로 사용된다. 본 기고에서는 IPTV 표준화 동향, 관련 기술, 국내외 서비스 동향, 신규 IPTV 서비스 예 등을 살펴보고, ETRI에서 구축한 FTTH 기반 IPTV 테스트베드를 간략하게 소개한다.

• Proceedings of the Korea Contents Association Conference
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• 2005.05a
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• pp.101-106
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• 2005

According to the IT839 strategy which was announced by the Ministry of Information and Communication(MIC) in 2004, the convergence trend of the broadcasting and the communication would be much more promoted. Thus, the methods for protecting the broadcasting contents will be indispensible elements for the successful IPTV service achievement. This paper describes the characteristics of IPTV and the related contents protection techniques. To evaluate several security issues, we suggest a security model for IPTV, and speculate the most widespread, two security technologies for IPTV such as CAS and DRM.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2012.11a
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• pp.191-194
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• 2012

IPTV는 2008년 처음 서비스가 시작된 이후 IPTV 콘텐츠 호환성 확보와 단말 이동성 확보를 통한 IPTV 서비스 활성화 및 전체적인 비용 절감을 위해 많은 표준화 이슈들이 있었고 짧은 시간동안 많은 부분 표준화가 완료 되었다. 그러나 기존의 XML 기반의 서비스 정보를 송출하고 수신하는 제품이 없고 표준 검증을 위한 기준 단말 및 서버가 개발자에게 제공되지 않아 표준의 빠른 상용화 개발에 어려움이 있다. 이에 본 논문은 방통융합 기반기술 테스트 환경 구축 과제를 통해 IPTV 서비스 탐색과 콘텐츠 가이드 표준 참조구현 소스를 오픈소스 방식으로 무료 배포하기 위하여, IPTV 서비스 환경에 적합한 XML 기반의 서비스 정보와 콘텐츠 가이드 정보를 H/E단(서버)에서 송출하고 단말을 통해 이들 정보를 확인하는 기술 표준인 "IPTV 서비스 탐색 및 전송방식"과 "IPTV 콘텐츠 가이드 정보 및 전송방식" 표준을 적용한 서버와 단말 기능을 개발하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2010.07a
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• pp.257-260
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• 2010

통신 기술과 모바일 기술의 발달로 인해, 이 두 기술을 융합된 모바일IPTV가 탄생하였다. 하지만, 모바일IPTV는 기존의 IPTV와는 달리 방대한 종류의 디바이스와 그에 따른 제공하는 비디오 포맷과 같은 제약들이 존재한다. 하지만 기존의 서비스는 다양한 이기종의 모바일 장치의 특성을 고려하지 않고 서비스 제공자가 모든 사용자에게 같은 서비스를 제공하기 때문에 사용자는 콘텐츠의 포맷이나 용량으로 인하여 장치에 알맞은 컨텐츠를 받지 못할 경우가 있으며 혹은 신속하게 서비스를 제공받지 못할 경우가 있다. 위와 같은 문제를 해결하기 위해서, 본 논문에서는 CC/PP(Composite Capabilities / Preference Profile)를 이용하여 이기종의 모바일IPTV 장치들의 규격 및 특성을 분석하고, 이를 통해 다양한 기종의 모바일IPTV 사용자들에게 장치의 특성에 맞는 맞춤형 서비스를 최적화하여 제공할 수 있는 시스템을 제안한다.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.365-366
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• 2008

The study purposes to analyze features and structures of Digital cable and IPTV service and to suggest how to survive in the competition. Since the two media provide their service to general subscribers, the study also tries to suggest how they cooperate one another without a cutthroat competition.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.884-887
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• 2009

Social Network Service has been extremely popular these days and providing diverse features and functions to users. Social networking and interest sharing in between users are key factors of SNS and this circles back to draw more users to the service. Web is the first media to provide SNS and mobile is the next. The service based on mobile environmental uniqueness such as Location-based-service(LBS) is the key success factors to convert users to web SNS to mobile SNS. TV has also been a possible SSN market to draw users to share interests and participation. However TV has been always community electronics in family members and personalization to provide SNS has been barrier to overcome. In this study, we explorer ideas of key factors of personalization in TV environment and conducted a field study to define characteristics of TV personalization in terms of depth, method, style and structure. Research finds out that there are significant differences in these categories.

• Journal of the Korea Society of Computer and Information
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• v.15 no.7
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• pp.57-66
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• 2010

Due to the advancement of IPTV technologies, open IPTV services are a step closer to becoming reality. In such service environment, users are able to enjoy IPTV services using a variety of devices available at their home domain. However, it is impossible to get such flexible services at their convenience unless each of devices is individually connected to Set-Top-Box (STB) because of Conditional Access System (CAS) or service providers otherwise allow STB to freely distribute decoded contents to every user devices attached to STB. In this paper, we propose a key management scheme for securely distributing contents from STB to multiple user devices at home domain. The proposed scheme also makes the service providers be able to control the access rights to each of user devices without installing individual STBs. It is achieved by computationally dividing a private key of RSA signature scheme into three parts and thus makes possible to distribute the contents scrambled through a underlying CAS mechanism without re-encrypting them that the existing scheme should employ. It improves significantly computation and communication complexities, maintaining it as secure as the existing schemes. Additionally, it prevents misbehaving users from illegally distributing the contents from STB to their devices available at home domain.

• Educational Technology International
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• v.11 no.1
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• pp.1-26
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• 2010

The purpose of this study was to identify differences in teachers perception on educational attributes and effectiveness of IPTV according to demographic factors. To investigate possibility of educational application, the participants of the study were teachers selected from IPTV initiative schools in elementary and middle levels nationwide. 55 teachers participated from 22 IPTV model schools nationwide, which were 9 elementary schools, 6 middle schools, 7 high schools. As results of research, there were some significant foundings. In terms of the perception on educational attributes of IPTV, there are explicit perceptional difference between "capital area teachers" and "the other regional teachers". However, there were no significant difference according to school level. Perception of male teachers were more positive than those of female teachers. Also, there were no significant difference according to teaching experience. On the other hand, in terms of the perception on educational effects of IPTV, we could conclude that teachers from metropolitan cities have more negative perception on IPTV than teachers from other kinds of cities have. Regardless of school levels, teachers showed merely fair perception on effectiveness of IPTV. There was significant difference between male teachers and female teachers in perception on educational effectiveness. Also, Results showed no significant differences according to teaching experiences. Future tasks for the development of IPTV strategies require specific need analysis of teachers and collaborative works of policy makers, teachers, researchers, and IPTV service providers.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2006.07a
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• pp.470-470
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• 2006