• Journal of the Korea Society of Computer and Information
• /
• v.19 no.6
• /
• pp.1-10
• /
• 2014

In this paper, we propose a real-time video playback scheme for the N-Screen service based on Windows Azure. This scheme creates several playback blocks based on the performance of each node by non-uniform splitting of the original video. To reduce transcoding-time, it allocates the playback blocks to a corresponding node by transcoding the playback blocks. Through the simulation, we show that it is more effective to use real-time video playback for the N-screen service than the previous method. The proposed scheme splits an AVI format 300MB source video with non-uniform playback blocks. It allocates the playback blocks to the heterogeneous node of Windows Azure, the commercial cloud system and measures of transcoding-time by transcoding non-uniform playback blocks to mp4 and Flv format. As a result, the proposed scheme improves the performance of the N-screen service based on Windows Azure compared to the previous uniform split strategy.

• The KIPS Transactions:PartC
• /
• v.18C no.3
• /
• pp.135-142
• /
• 2011

Recently, the strategy for N-screen service is in the spotlight along with the consumer's need to use contents regardless of time and place due to the rapid development of communication technology, which is meshing with the desire of service providers seeking a new business model. N-screen, as a screen-extension-concept service which enables consumers to continuously share and use contents in various equipments such as TV, computer and portable terminals, is an advanced type of 3-screen service strategy initially proposed by AT&T, an American telecommunication company. In the N-screen service for pay-contents, in order to support continuous screen changes to and from various equipments, temporary watching right should be given to the equipment intended for screen change. However, it is impossible to give the temporary watching right in the present broadcasting environment, adopting an access-control system. In this paper, the access-control technology being used for pay-contents in the present broadcasting environment and the reason for not being able to give temporary watching right, will be examined. After the examination, the solution for delegation of watching right by using an additional key on the basis of currently used access-control technology, will be proposed.

• Proceedings of the Korean Information Science Society Conference
• /
• 2012.06a
• /
• pp.16-17
• /
• 2012

본 논문에서는 클라우드 컴퓨팅 환경에서 N-스크린 서비스를 위한 동영상 콘텐츠의 분산 인코딩 기법을 제안한다. 이 기법은 Hadoop에 기반하여 인코딩 작업을 여러 가상머신에서 분산 실행하는데 각 가상머신의 작업량을 가상머신의 성능에 따라 다르게 할당한다. 성능에 따른 차등할당으로 가상머신의 유휴(idle)시간을 최소화하여 총인코딩시간을 단축시키고, 자원 활용도를 높일 수도 있다. 실험을 통하여 제안한 인코딩 기법이 균등분할 방식보다 짧은 시간에 인코딩을 완료함을 보인다. N-스크린 서비스는 같은 동영상을 다양한 디바이스 특성에 맞추어 여러 가지 해상도로 스트리밍 해야 하기 때문에 인코딩 소요시간을 단축함으로써 서비스의 성능 향상을 기대할 수 있다.

• Journal of Digital Convergence
• /
• v.11 no.11
• /
• pp.775-781
• /
• 2013

N-screen is a Service that can be provide for One Service Multi Device. If the network is changed or if the device is changed after authentication the device fits seamlessly send footage. Security threats that occur here have a problem with user authentication. In this paper proposes available in a multi-device the authentication system. Homomorphic Encryption Algorithm of authentication scheme used. Among the authentication mechanism that already exists is a simple and lightweight authentication mechanism. In addition, N-screen service that uses multiple devices is simple authentication process of the device. Review the results of proposed authentication protocol, encryption algorithm to process a small storage capacity and is easy to work in low processor. And was suitable for use with multiple devices.

• Electronics and Telecommunications Trends
• /
• v.27 no.5
• /
• pp.126-133
• /
• 2012

멀티비전이라 함은 하나의 영상을 확대시키거나 축소할 수 있고 이것을 다수대의 영상표시기기 등 영상출력수단을 연결 디스플레이하는 시스템을 말한다. 이와 같은 멀티비전 시스템은 최근 각광받는 디지털 사이니지용 스크린을 이용한 광고, 전시 홍보에 널리 사용되며 N-스크린 서비스와 같이 다양한 스크린 단말에서의 연동 서비스로서 활용될 수 있다. 본고에서는 디지털 사이니지의 멀티비전 서비스나 감시 보안용 멀티비전으로 사용되는 서비스 시스템에 대해 유형별로 조사해보고 장 단점을 비교해 보고 이와 같은 멀티비전을 활용하는 국내외 서비스 동향에 대해 살펴본 뒤 보다 개선된 멀티비전 시스템의 나아갈 방향을 제시하고자 한다.

• Journal of Digital Contents Society
• /
• v.16 no.1
• /
• pp.79-83
• /
• 2015

This paper suggested a cyber collaboration platform based on web for food safety service. We implemented the cyber collaboration platform for food safety service so that the users participated in collaborative work may refer shared media objects as the same view to others. In this paper, we discussed a model for increasing reliability of food safety data through N screen server and client model. This paper explained a performance analysis of a system with function comparison running on multimedia collaboration work based on web and N screen techniques.

• Journal of Digital Contents Society
• /
• v.15 no.3
• /
• pp.339-346
• /
• 2014

VOD Service, which has established a solid foothold as a profit model of digital broadcasting companies, is emerging as a key application of the N-screen technologies and services. In the circumstance, broadcasting companies are trying to promoting their VOD services by providing mobile services for improving the VOD service usability. The paper introduces a VOD mobile app (of a domestic digital cable broadcasting), which includes the functions of promoting the VOD programs and events printed on a VOD guide book, directly transmitting the information (e.g., book-marking and remote-control signals) to a set-top box, and watching the video contents stored in the mobile device on TV.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2013.11a
• /
• pp.193-195
• /
• 2013

N-스크린 환경에서 방송사들을 포함한 사업자들은 온라인을 통해TV 프로그램을 시청자들에게 제공하고 있다. 사업자들은 N-스크린 서비스를 운영하면서 광고를 통해 수익을 창출하고 있는데, 모바일 이용이 활성화 되면서 N-스크린 광고 시장 규모도 증가하고 있다. 모바일 환경에서는 화면 크기의 제약으로 인해 기존의 이미지, 베너 형태의 광고 보다 동영상 광고방식이 유리하여 이에 대한 수요가 높은데, N-스크린 환경에서 다양한 화면 사이즈를 가진 기기에 동영상 광고를 제공하기 위해서는 광고 소재 관리가 필수적이다. 또한 온라인 광고 제공에 관여하는 광고주, 광고 대행사, 플랫폼 사, 매체 사 간에 협업이 가능한 시스템 개발이 요구된다. 본 논문에서는 N-스크린 환경에서 동영상 광고를 효율적으로 제공하고 운영하기 위한 시스템을 제안한다.

• Journal of the Korea Society of Computer and Information
• /
• v.19 no.9
• /
• pp.11-19
• /
• 2014

In this paper, we propose a real-time video transcoding scheme for N-Screen service based on cloud computing. This scheme creates an intro-block and several playback blocks by splitting the original video. And there is the first service request, after transmitting the intro-block, transmits the playback blocks that converting the blocks on real-time. In order to completing trans-coding within playback time of each block, we split and allocate the block to node according to performance of each node. Also, in order to provide real-time video playback service, the previous scheme convert original video into all format and resolution. However we show that the proposed scheme can reduce storage usage by converting original video into format with proper resolution suitable to device and platform of client. Through simulation, we show that it is more effective to real-time video playback for N-screen service than the previous method. We also show that the proposed scheme uses less storage usage than previous method.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.20 no.12
• /
• pp.2267-2273
• /
• 2016

In this paper, WiMedia Distributed-MAC protocol is adopted for development of an OSMU (One Source Multi Use) N-screen wireless multicast service. But, when considering wireless communication environment where channel error rate is time-variant, N-screen high-speed data is vulnerable to be lost. For this problem, a multicast relay scheme is proposed by analyzing Distributed-MAC protocol. In proposed multicast relay scheme, Multicast-free DRP Availability IE is combined and the relay node suitable for N-screen multicast transmissions is selected. Through this operation, it can avoid wireless channel with high errors and can transmit N-screen high-speed data. In simulation results, the proposed multicast relay scheme is compared with conventional Distributed-MAC multicast scheme in view points of throughput and energy consumption according to various numbers of multicast nodes and BER (Bit Error Rate) values in wireless channel. Through simulation results, it is explained that proposed multicast relay scheme should be adopted in WiMedia Distributed-MAC protocol to realize OSMU N-screen wireless multicast services.