• The Journal of the Korea Contents Association
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• v.11 no.10
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• pp.115-127
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• 2011

As broadcasting contents are recognized as a key competition means, there are issues raised such as improvement of terrestrial retransmission system, introduction of PAR in broadcasting market and so forth. Especially, in pay broadcasting market, strategic partership between SP and PP leads to contents exclusivity for competitors, which causes to hinder normal competition and limit viewers' right of access. Consequently, not only is it claimed that essential facilities doctrine should be adopted in broadcasting market, but also clause of content equal access in IP TV law and adoption of prohibited acts regulation can be viewed in the same context. However, adoption of essential facilities doctrine in broadcasting market is likely to be counterproductive because of the differences of philosophies, economies and legal systems on which general facilities and contents are based. Therefore, it is time for a essential facilities concept, a fundamental concept of a refusal to dealing of essential facilities, and basic works to review specific cases and precedents implemented in competition laws market This study aims to review and propose beforehand if adoption of essential facilities doctrine is appropriate for broadcasting contents.

• Journal of Digital Contents Society
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• v.9 no.3
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• pp.399-412
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• 2008

The 21st century has been changed into a knowledge-oriented society, which means our society is more dependent on information and moves toward information. The mixing of broadcasting and co mmunication prevails and it makes possible a new type of broadcasting service. Depending on that, a broadcasting is being changed into a consumer-oriented service to satisfy the demands of consum ers in a new media age. It makes us attain to the personal media age to be possible interactive com munication unlike existing one-way transmission. As a result, new complex media are commercialize d and the instance is DMB. DMB is said 'my own TV' or 'TV in my own hands'. But it has limit t o retransmit existing broadcast programs. So hereafter, DMB broadcasting must be produced with co ntents suited its properties out of retransmitting existing contents. It is necessary to analyze exactly properties and service fields of DMB media to make an establish production direction of contents for DMB. This paper intends to suggest overall optimized image-contents production direction including appropriate program developments, a proper running time, visual expressions such as a camera angle and walking etc... DMB contents suited with its properties will give more familiarities to DMB users. Besides, DMB is expected to be a new culture watching broadcasting.

• The Journal of the Korea Contents Association
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• v.8 no.6
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• pp.43-53
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• 2008

Hyper text transfer protocol (HTTP) over transmission control protocol (TCP) is currently used to transfer objects in the Internet. Stream control transmission protocol (SCTP), an alternative to TCP, which allows for independent delivery among streams, and can thus reduce the mean response delay of web object. We present an analytical model to find the mean response delay for HTTP over SCTP, therefore, estimate the effectiveness of SCTP over TCP. Typical TCP delay models assume the wired environment. On the contrary, the proposed model in this paper assumes the multiple packet losses and wireless environment where fast retransmission is not possible due to small window. The estimated mean response time can be used the benchmark to meet quality of service (QoS) at end-user. We validate the accuracy of our model using experiments. It is shown that the differences between the results from model and those from experimental are very small below 6 % on average. We also find that the mean response delay for HTTP over SCTP is less than that for HTTP over TCP.

• Broadcasting and Media Magazine
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• v.16 no.1
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• pp.30-39
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• 2011

HbbTV는 Hybrid broadcast broadband TV의 약자로서 기존 방송과 함께 브로드밴드(Broadband) 웹 콘텐츠를 거실에 있는 TV 화면에 가장 효과적으로 전송하여 보여 주고, 사용자와 상호 작용 할 수 있도록 유럽에서 시작되어 만들어진 표준이다. HbbTV 표준은 소수의 새로운 기술 요소만 새로 도입하여 표준을 만들고, 대부분 이미 존재하고 검증된 특정 표준을 그대로 재 사용하였기 때문에 개발 비용 및 특히 적시 출시(time-to-market)에 큰 강점을 가지고 있다. HbbTV는 EBU "hybrid broadcast/broadband systems"의 요구 조건을 완전히 만족하는 표준이 되었다.

• The Journal of the Korea Contents Association
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• v.4 no.4
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• pp.189-196
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• 2004

Most of the recent researches for ATM switches have been based on multistage interconnection network known as regularity and self-routing property. These networks can switch packets simultaneously and in parallel. However, they are blocking networks in the sense that packet is capable of collision with each other Mainly Banyan network have been used for structure. There are several ways to reduce the blocking or to increase the throughput of banyan-type switches: increasing the internal link speeds, placing buffers in each switching node, using multiple path, distributing the load evenly in front of the banyan network and so on. Therefore, this paper proposes the use of recirculating shuffle-exchange network to reduce the blocking and to improve hardware complexity. This structures are recirculating shuffle-exchange network as simplified in hardware complexity and Rank network with tree structure which send only a packet with highest priority to the next network, and recirculate the others to the previous network. after it decides priority number on the Packets transferred to the same destination, The transferred Packets into banyan network use the function of self routing through decomposition and composition algorithm and all they arrive at final destinations. To analyze throughput, waiting time and packet loss ratio according to the size of buffer, the probabilities are modeled by a binomial distribution of packet arrival. If it is 50 percentage of load, the size of buffer is more than 15. It means the acceptable packet loss ratio. Therefore, this paper simplify the hardware complexity as use of recirculating shuffle-exchange network instead of bitonic sorter.

• Journal of the Korea Society of Computer and Information
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• v.24 no.11
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• pp.11-19
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• 2019

Recently, hybrid CDN/P2P video streaming architecture is specially designed and deployed to achieve the scalability of P2P networks and the desired low delay and high throughput of CDNs. In this paper, we propose a cooperative video streaming and active node buffer management technique in hybrid CDN/P2P architecture. The key idea of this streaming strategy is to minimize network latency such as jitter and packet loss and to maximize the QoS(quality of service) by effectively and efficiently utilizing the information sharing of file location in CDN's proxy server which is an end node located close to a user and P2P network. Through simulation, we show that the proposed cooperative video streaming and active node buffer management technique based on CDN and P2P network improves the performance of realtime video streaming compared to previous methods.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2005.11a
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• pp.229-232
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• 2005

현재 디지털방송 서비스가 확대되고 있는 시점에서 방송콘텐츠 보호에 대한 중요성이 날로 부각되고 있다. 이에 MPEG-2 IPMP는 디지털방송 서비스를 제공받아 소비하는 방송 단말로부터 방송콘텐츠를 불법적으로 사용할 수 없도록 보호할 수 있게 정의하고 있는 대표적인 국제 표준 규격이다. IPMP 규격을 기반으로 한 방송 단말을 구현함에 있어 보호된 방송콘텐츠를 IPMP 툴로 처리하여 소비하게 되는데 만약 방송 단말에 IPMP 툴이 없다면 방송되고 있는 MPEG-2 전송스트림이나 원격지에서 필요한 IPMP 툴을 다운로드 받아 방송 단말에 업데이트를 시켜야 한다. 이때 방송 단말에서 위와 같은 기능이 구현되기 위해서는 구체적인 소프트웨어 설계 방식을 통해 다양한 플랫폼에 대해 구현된 기능에 대한 재사용성이나 호환성을 확보하는 것이 효율적이다. 하지만 점차적으로 복잡해지고 다양해지는 멀티미디어 기기들의 기능들을 위해 탑재되는 소프트웨어 역시 복잡해지고 있어 그 재사용성이나 호환성이 떨어지고 있는 실정이다. 본 논문에서는 이러한 소프트웨어의 재사용성이나 호환성을 최대한 보장할 수 있도록 현재 MPEG(ISO/IEC JTC1/SC29/WG11)에서 표준화가 진행 중인 MPEG Multimedia Middleware(M3W) 규격을 기반으로 한 소프트웨어 설계 방식을 살펴보고, 디지털방송 단말에서 IPMP 툴 업데이트 기능이 효율적으로 설계되고 구현될 수 있는 소프트웨어 구조를 제안하였다.

• Proceedings of the Korea Contents Association Conference
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• 2008.05a
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• pp.569-572
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• 2008

I proposed wireless ordering system using Qt embedded. This system will make the good use of real life applications and make fit for practical use. I embodied data input, transfer, gathering and back-transfer on wireless network using TCP/IP protocol on QSocket provided by Qt. Server environment is Linux 9.0 and gcc-2.95.3 on PC, and three target-boards consist PXA255 processor with wireless-LAN card which communicate through wireless access pointer. Software tools on target-board are gcc, tmake, qt-X11, qt-embedded and etc. I designed touch-screen interface for user convenience.

• The Journal of the Korea Contents Association
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• v.12 no.4
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• pp.119-132
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• 2012

This study is to consider the major policy issues related to 3DTV in terms of the platform projects, not the terminal and equipment manufacture. It reviews what problems the 3D policy in terms of the platform projects has posed so far, and discusses the issues that may appear when the 3D TV is commercialized in the broadcasting market. The major issues dealt in the study include the frequency policy of the terrestrial platform, the additional services activation of the pay platform players, the retransmission policy of terrestrial broadcasting, and the advertising market policy.

• Journal of Broadcast Engineering
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• v.12 no.5
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• pp.401-413
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• 2007

The birth of a new mobile medium of communication In 2005, the DMB (Digital Multimedia Broadcasting), was celebrated for the mobile and asynchronous personal medium. But now, the most film- & video-channels of this epoch-making medium of communication combine with the rebroadcasting of long play film for cinema oder TV series. The purpose of this study is thus to point out the disharmony between new mobile medium and the old, recycled contents and to propose as an alternative content the digital shortshort moving images.