• Journal of Broadcast Engineering
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• v.7 no.1
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• pp.28-36
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• 2002

In this paper. we propose an interactive broadcasting system based on MPEG-4 to provide Interactive services in digital TV broadcast. The proposed system is designed to support various functionalities such as authoringof MPEG-4. encapsulation of MPEG-4 Into MPEG-2 TS (Transport Stream) protocol, synchronization of MPEG-4 with MPEG-2 program. demultiplexing of MPEG-4 from MPEG-2 TS. decoding/rendering of MPEG-4 and interactivity through IP network on ATSC (Advanced Television Systems Committee) platform. The interactive broadcasting system based on MPEG-4 Is used to provide interactive functionality In full for user. and it has a particular advantage of substitution for the ATSC or DVB platform. as well.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.10C
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• pp.937-944
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• 2002

The current fast-growing Internet traffic is demanding more and more network capacity. Photonic packet switching offers high-speed, data rate/format transparency, and configurability, which are some of the important characteristics needed in future networks supporting different forms of data. In this paper, we define that optical backbone networks for IP transport consist of optical packet core switches and optical fibers. We propose a multi-link photonic packet switch managing as single media which unifies the whole bandwidth of multiple wavelengths on the optical fiber in the WDM optical networks. The proposed switch uses optical packet memories of output link equally as well as using the WDM buffer. So it cuts down the required number of buffers and realizes of the optical packet memory economically.

• Journal of the Korea Computer Industry Society
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• v.9 no.2
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• pp.53-62
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• 2008

Intensive studies have been made in the area of IPTV VOD server. The basic goal of the study is to find an efficient mechanism to allow maximum number of users under the limited resources such as Buffer utilization, disk performance and network bandwidth. The overlay multicast that has been recently presented as an alternative for the IP multicast has been getting much persuasion by the system resource and the network bandwidth and the advancement of the network cost. we propose a efficient overlay multi_casting network policy for multimedia services with multi media partition storage. Simulation results show that the rate of service number and service time of proposed scheme are about 23% performance improved than that of traditional methods. This implies that our method can allow much more users for given resources.

• The Journal of the Korea Contents Association
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• v.8 no.10
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• pp.95-103
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• 2008

Hana TV and Mega TV have been growing rapidly with IP-VOD service. The number of subscribers of both of them were 1.4 million in April 2008. Additionally, the change of viewing patterns of IPTV subscribers was predicted. Therefore, the purpose of this paper is to see how the subscribers use IP-VOD service practically. For this research, the frequency, the time and the duration of connection by genre have been analyzed on the March of 2007 and 2008. According to the result, there was a significant change quantitatively: within a year, not only the number of subscribers has doubled, but also the frequency of monthly connection has been increased 15 times. In addition, the duration of viewing per person has quadrupled. Regarding to the contents, the subscribers still prefer to watch free TV programs. However, the viewers have their own way of consuming TV programs. It has been proved that IPTV is a complementary media of free TV with a strong possibility to change the viewing patterns in the near future.

• Journal of the Korea Society of Computer and Information
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• v.17 no.8
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• pp.163-170
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• 2012

Nowadays Internet is the greatest and most participating media of prompting expression with 37 million users in Korea. Internet enables collective communications between social members and contributes to form sound public opinions and to develop democracy while it has negative aspect to distribute massively crime by illegal posting which is forbidden by the Criminal Act. Criminal actors who involve to diffuse information on Internet consist of three categories of information provider, user and internet service provider. Illegal posting generated on Internet is originated from IP and the criminal regulation on it is useless and meaningless because of its countless of users and ambiguous boundary with liberty for expression. Accordingly, the only criminal policy means to prevent danger by illegal posting on Internet is to regulate ISP which saves illegal posting and mediates contacts among users. In spite of it, legislation to regulate ISP is unprepared. The prudent legislative review should be done. And it should be accordance with the doctrines of propriety and vagueness of the principle of "nulla poena sine lege".

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2010.07a
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• pp.152-155
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• 2010

IP기반 미디어 서비스는 대규모 사용자를 확보할 수 있고, 사용자 규모에 따른 수익을 올릴 수 있기 때문에 방송사에서는 중요 서비스의 하나로 인식하고 있다. 사용자의 지속적이고 빠르게 변화하는 새로운 서비스에 대한 요구사항들을 만족시키기 위해서 방송사는 보유하고 있는 관련 시스템들을 항시 새로운 서비스에 유연하게 대처할 수 있도록 해야 한다. 본 논문에서는 IP기반 미디어 서비스에 유연하게 대응할 수 있는 체계화된 방송콘텐츠 서비스 개방형 아키텍처 (OASIS: Open Architecture for Systematic IP-based Services)를 제안한다. 'OASIS'는 제작 시스템에서 자동으로 콘텐츠(예. 에센스와 메타데이터)를 수집하고 다양한 서비스에 맞게 수집된 콘텐츠를 제공할 수 있는 체계적이고 유연한 아키텍처이다. 더불어 OASIS는 방송콘텐츠 저작권 확보 여부를 확인할 수 있도록 하였기 때문에 최근 중요시되고 있는 저작권이 확보된 콘텐츠를 서비스할 수 있다. 제안하는 아키텍처는 시스템들 간에 콘텐츠를 교환할 때 표준화된 메타데이터와 ID를 사용하여 교환하게 함으로써 서비스 할 콘텐츠를 자동으로 시스템화하여 수집할 수 있다. KBS는 2년간의 작업을 거쳐 방송콘텐츠를 공유하는 데 필요한 메타데이터와 ID의 표준화 작업을 수행하였으며, 이를 기반으로 체계적으로 자동화된 수집 체계를 고안하였다. 다양한 서비스에 유연하게 콘텐츠를 제공하기 위한 측면으로는 openAPI(Application Programming Interface)를 활용하여, 서비스의 요구에 맞는 콘텐츠 내용을 제공할 수 있도록 하였다. 마지막으로 라이선스 관리 측면으로는 방송 콘텐츠 제작 시 수집할 수 있는 계약 정보 및 서비스 유통 가능 범위를 체계화함으로써, 제작 시에 저작권 정보를 수집하고, 해당 콘텐츠와 연동하여 서비스 가능 여부를 확인할 수 있도록 하였다. 제안한 아키텍처를 활용하여 다양한 서비스의 요구에 대응할 수 있는 콘텐츠 서비스 시스템을 구축할 수 있다.

• Journal of Broadcast Engineering
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• v.21 no.6
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• pp.986-994
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• 2016

In this paper, a digital closed-circuit television (CCTV) transmission system called the extended reach high definition serial digital interface (ER-SDI) is proposed to increase the transmission distance while preserving the quality using digital modulation. The current standard of HD-serial digital interface (HD-SDI) has the maximum transmission distance of 200 m. Recently, one system which transforms the digital signal to an analog signal and modulates color signal to extend the transmission distance is proposed. Another system which uses IP network is also proposed. However, the former system has a disadvantage of video quality and the latter system has high latency. The proposed ER-SDI is designed to extend the transmission distance of 518 m by adopting multilevel constellations and a channel code for a data rate of 1.485 Gbps. The maximum transmission distance of the proposed system is calculated using the specification of HD-SDI and the experiment result under coaxial cable environment.

• Journal of Satellite, Information and Communications
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• v.11 no.3
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• pp.37-42
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• 2016

In this paper, in today's highly complex video and broadcast operations, broadcasters are constantly challenged to reliably deliver low-latency, high-quality video to multiscreen audiences on-air and online. The Adaptive Bit Rate (ABR) protocols enable internet video to a wide range of multiscreen devices. However, video quality is often marginal and would prove unacceptable for valued linear broadcast content delivered to the Big Screen today. The Media information processing technology advances in ABR enables service providers to take control and offer quality managed linear video services to ALL screens in the home, including the Big Screen, with a single unified IP Video infrastructure. The New Multiscreen-Assisted ABR (MSA-ABR) delivery management system proposed using Cloud based multicast-assisted ABR for a broadcast facility that performs routing of contribution content and online publishing services within a virtual, centralized cloud infrastructure.

• The Journal of the Korea Contents Association
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• v.10 no.3
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• pp.80-91
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• 2010

Due to the convergence of broadcasting and communications, IPTV services are spotlighted as the that next-generation multimedia services. IPTV services should have functionality such as unlimited channel capacity, extension of media, QoS awareness and are required increasing traffic and quality control technology to adapt the attributes of IPTV service. Consequently, flow based quality control techniques are needed. Therefore, many studies for providing Internet QoS are performed at IETF (Internet Engineering Task Force). As the buffer management mechanism among IP QoS methods, active queue management method such as RED(Random Early Detection) and modified RED algorithms have proposed. However, these algorithms have difficulties to satisfy the requirements of various Internet user QoS. Therefore, in this paper we propose the Flow based AQM(Active Queue Management) algorithm for the multimedia services that request various QoS requirements. The proposed algorithm can converge the packet loss ratio to the target packet loss ratio of required QoS requirements. And we present a performance evaluation by the simulations using the ns-2.

• Current Research on Agriculture and Life Sciences
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• v.16
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• pp.31-36
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• 1998

In order to investigate the effect of cytokinins on the cotyledonary variability of somatic embryos in Heracleum moellendorffii Hance., somatic embryos were induced from the immature zygotic embryo on MS medium containing 1.0mg/l 2, 4-D, and then transferred to 2,4-D-free and cytokinin-added medium for somatic embryogenesis after 4weeks culture. Polycotyledonary embryos were formed most abundantly(84.9%) on the 0.2mg/l BA medium as compared with the 0.2mg/l 2ip(42.6%) and kinetin(32.9%) media, and it was proportional to BA concentrations(0.01~0.1mg/l). The rate of polycotyledonary embryo formation increased proportional to the period of BA treatment and also increased more at the globular stage than at the heart, torpedo-shaped and cotyledonary stages.