• 한국정보통신설비학회:학술대회논문집
• /
• 2007.08a
• /
• pp.173-175
• /
• 2007

So far, almost all IP media services are targeted to the specific devices, for example, IPTV services are mainly for TV, and social community services are mainly for PC etc.. This paper describes newly developed media service platform in which the high quality video services can be provided not only to the TV or PC but also to the PMP(Portable Media Player) and even to the mobile phone. The major technical issues of the service platform are synchronization of contents among the different devices and high quality TV grade video display in PMP device. We confirmed successful operation of multi-device converged services in the developed media platform. We also have a trial service plan in Gwangju city at the end of this year.

• IEMEK Journal of Embedded Systems and Applications
• /
• v.3 no.4
• /
• pp.182-192
• /
• 2008

The personalized service becomes an important role in consuming the mobile broadcasting contents due to the lack of television watching time in the mobile environment. The paper discusses the technology development of ECG (electronic content guide) for personalized broadcasting service such as contents tracking, time shifting and contents scraping according to user preference.

• Electronics and Telecommunications Trends
• /
• v.26 no.4
• /
• pp.43-56
• /
• 2011

모바일 IPTV는 무선 인터넷 망을 이용하여 방송 서비스를 제공하는 기술로서 IPTV에 이동성이 더해진 기술이다. 고속의 이동환경에서 언제, 어디서나 고품질의 TV 및 VoD, 데이터 서비스를 제공해 주는 모바일 IPTV 서비스를 실현하기 위해 각 기술과 서비스들이 연구 개발되고 있다. 본 논문에서는 IPTV 표준화 동향에 대해서 분석하고 고품질의 모바일 IPTV 서비스 품질을 보장해주기 위한 핵심기술에 대해서 기술한다. 그리고 Mobile WiMAX와 3GPP/LTE 기반의 모바일 IPTV 시스템에 대해 기술한다.

• Proceedings of the Korea Contents Association Conference
• /
• 2013.05a
• /
• pp.91-92
• /
• 2013

모바일 기기인 스마트폰, 태블릿 PC의 대중화를 통해 영화, TV, 컴퓨터와 더불어 제4의 스크린이라 불리는 모바일 영상 콘텐츠 혹은 모비소드(Mobisode)는 영상물 시청에 있어서 때와 장소를 가리지 않는 편리함으로 인해 시청자들에 대한 파급력이 확대되고 있으며 이로 인한 모바일 광고와 마케팅의 수단으로서의 활용가치가 크게 주목되고 있다.

• Information and Communications Magazine
• /
• v.27 no.12
• /
• pp.3-10
• /
• 2010

사회적 요구와 고객니즈의 변화에 따라 미래사회는 융합사회라는 새로운 패러다임으로 나아가고 있다. 본고는 융합사회를 실현하는 New ICT 서비스의 전개 현황을 설명하고, 미래 진화방향에 대해 전망해보았다. ICT 기술의 진화방향은 지능화, 이동성 증대, 내재화로, 현재 이러한 진화방향에 따라 3D 영상서비스, 스마트TV, FRC, SNS, m-VoIP, Mobile OS, 임베디드 S/W 상의 New ICT 서비스사 보편화되어 가고있다. 한편, 미래의 ICT 서비스는 융합화, Smart화, Mobile화라는 방향성을 가지고 진화할 것으로 전망된다.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2009.10a
• /
• pp.1077-1080
• /
• 2009

In this paper, we propose a new method for measuring image sticking of an OLED display using a human visual test. We determined that the perceptual image sticking threshold is 2% of luminance difference at 200 nits and 1% at 100 nits, respectively. Color shift must also be considered when evaluating image sticking, as a ${\Delta}$(u', v') shift of just over 0.002 can be recognized regardless of background brightness. Perception of image sticking is affected by the background level, test pattern, and ambient illumination conditions. The evaluation standard must consider both luminance variation and color shift simultaneously.

• Journal of Institute of Control, Robotics and Systems
• /
• v.13 no.2
• /
• pp.114-120
• /
• 2007

This paper introduces a mobile robotic system being developed for urban search and rescue. In order to search human victims in narrow spaces, we developed two types of serially linked mobile robots, named KAEROT-Centipede and KAEROT-SnakeTV1, that can climb over large vertical steps or travel inside narrow vertical pipes. To send such mobile robots to the disaster areas coping with large obstacles, we also developed a assistant mobile robot, named KAEROT-QuadTrack, that has 4 articulated track modules. This paper describes the mechanical structure and control architecture of the serially linked mobile robots and the supporting configuration for torque reduction of the assistant mobile robot during spinning motion that usually requires large driving torque. The experimental results show that such robotic systems have good mobility over the various terrains in disaster areas.

• Journal of Korea Multimedia Society
• /
• v.19 no.5
• /
• pp.856-864
• /
• 2016

Recently, HD transmission was commonplace in the case of the terrestrial broadcasting, furthermore, 4k UHD broadcasts are also being pilot and such as HD contents are common even in smart-phones. Like this, through both the content and audience are in the situation to take advantage of the HD mobile TV, only QVGA video contents are being transmitted in the terrestrial DMB broadcasting. In this paper, introduction plan of HD DMB service for activation of DMB industry will be described in terms of technical, institutional, and policy to overcome the limitations of such as DMB broadcasting. Due to the introduction of HD DMB, high quality contents will be provided to audience and the advertising revenue DMB broadcasters increased so that the market share of DMB in mobile broadcasting be recovered.

• Journal of information and communication convergence engineering
• /
• v.8 no.3
• /
• pp.295-300
• /
• 2010

Recent researches of network structure are moving to high-level networks because there are already many research results of low-level network. Especially, current network services has been changed to the multimedia service using multicast routing such as IPTV(Internet Protocol Television) service. And then previous multicast services were provider oriented. So previous multicast structures were organized server/client model. But future multicast services will make user oriented services. Therefore there will be many service providers in the future. At this point, we study P2P network for supporting multi provider. So we research load balancing and contents lookup protocols in P2P network. In this paper, we propose network protocol and system based on super peer P2P for load balancing and efficiently service search. And we considered mobile environment for mobile IPTV.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2009.10a
• /
• pp.850-853
• /
• 2009

Many well-known pixel compensation circuits have been applied to control TFT $V_{th}$ variations on small size AMOLED panels. For large (>30-inch) AMOLEDs, luminance and color uniformity are affected by TFT variations, but also by ELVDD IR drop and cavity non-uniformity which are not easily compensated by in-pixel circuits. AMOLED panels may also suffer from manufacturing-induced mura. An external compensation method based on optical measurements is proposed and applied to large AMOLED panels. It improves luminance uniformity by up to 95% at 200nits and color uniformity by up to 99% (${\Delta}$u'v' <0.004) on large AMOLED panels, and provides-increased margin against processinduced mura.