• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.6
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• pp.1185-1192
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• 2015

A wireless bridge is essential to transmit control and managing information to sensors or instruments from a central integrated ship area network station. In this paper, a WPAN protocol is adopted for development of a seamless N-screen wireless service in Indoor and Ship Area Networks. Furthermore, to provide the OSMU (One Source Multi Use) N-screen service through P2P streaming in the seamless WPAN protocol, a Grid-based WPAN networking technology is proposed and analyzed. The proposed Grid-based WPAN networking technology supports multi-path and fast path-setup functions for N-screen communications. The simulation results demonstrate that the proposed Grid-based WPAN networking technology outperforms the IEEE 802.15.4 based network in terms of N-screen transmission delay.

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

• Broadcasting and Media Magazine
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• v.17 no.1
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• pp.51-58
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• 2012

최근 부각되고 있는 N-Screen 기술은 서버에 저장된 콘텐츠를 PC, TV, 휴대폰을 통해 끊김 없이 이용할 수 있도록 하는 기술이다. 이와 달리, 본 고에서는 사용자가 항상 휴대하고 다니는 스마트폰이 제공하는 다양한 서비스를 사용자 주변에 있는 외부 디스플레이 장치를 활용해 보다 편리하게 제공하는 새로운 개념의 N-Screen 기술을 소개한다. 또한, 이러한 스마트폰 중심의 N-Screen 기술의 핵심인 적응형 디스플레이 전환 방법(Adaptive Display Switching Method)에 대해 소개하고, 이를 안드로이드 모바일 플랫폼에 적용한 사례를 보인다.

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

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.3
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• pp.99-104
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• 2014

In this paper, the authors propose a multi-transmission mechanism of heterogeneous network environment which is applicable to the SMART screen services over wire and wireless convergence network. This paper presents study results including a SMART screen handover algorithm among multiple collaborative devices under wire and wireless convergence and heterogeneous network environment, and a service operation and management system and a NAS system providing SMART services of AV streaming and contents files. These validate implementation feasibility of a call processing engine for seamless SMART screen collaborative services, AV streaming services and SMART screen collaborative services supporting mobility management and multiple users/multiple streams.

• Journal of Broadcast Engineering
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• v.18 no.5
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• pp.749-757
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• 2013

This study aims to find out the influences of user behavior, content characteristics, functional factors and user's perception in cost on user satisfaction and continuous intention in N-Screen service. Web survey was conducted for 498 users who have used N screen service. The results show that the most influential factor contributing to user satisfaction is user interface. VOD diversity, payment system, cost, channel diversity are also meaningful factors. Identifying the critical factors which impact on user satisfaction, this study can provide the basic data for activating OTT service in smart media environment.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.5
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• pp.950-956
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• 2015

In this paper, a WiMedia Distributed-MAC (D-MAC) protocol is adopted for development of a seamless N-screen wireless service in Indoor and Ship Area Networks. Furthermore, to provide the OSMU (One Source Multi Use) N-screen service through P2P streaming in the seamless D-MAC protocol, a ATMT (Asynchronous Traffic Multi-hop Transmission) technology is proposed and analyzed. In this system, a WiMedia ATMT D-MAC bridge transmits control and managing information to various sensors and instruments, from a central integrated ship area network station. For this technology, a time slot allocation scheme for WiMedia asynchronous traffic and a multi-hop resource reservation scheme are combined to evaluate the performance of each scheme. From simulation results, the proposed ATMT scheme enhances performances in viewpoints of N-screen asynchronous data latency and throughput, compared to the conventional WiMedia D-MAC system.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06d
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• pp.433-435
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• 2012

N-스크린 서비스는 하나의 서비스를 다양한 스크린에서 콘텐츠를 효과적으로 공유하기 위한 기술로 하나의 서비스 및 콘텐츠를 여러 개의 방식으로 제공하는 3-스크린 서비스와는 차별화된다. 가정 내의 모든 단말기기들이 네트워크로 연결되는 지금의 현실에서 다양한 기기들 사이에서 자연스럽게 연결되고 데이터를 쉽게 공유할 수 있는 연계 기술에 대한 기술 요구는 당연한 현상이다. UI/UX 관점에서 자연스러운 입/출력과 더불어 제어 프로그램의 단순화는 서비스 적용과 많은 응용 서비스 개발을 위해서 꼭 필요한 기술이다. 본 논문에서는 이러한 스크린간의 공유 서비스를 제공하기 위해서 다수의 스크린을 가지는 단말들이 하나의 프로그램이 수행하는 것과 같이 동작하기 위해서 하나의 프로그램을 분할하고 이를 실행하는 방법에 대해 연구하고 그 가능성을 제시 한다.

• Communications of the Korean Institute of Information Scientists and Engineers
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• v.29 no.7
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• pp.45-54
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• 2011

• Journal of the Korea Society of Computer and Information
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• v.18 no.3
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• pp.11-18
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• 2013

In this paper, we propose a new design scheme of N-Screen emulator based on Cloud and then implement the emulator, in order to solve the critical point of N-Screen emulator based on Cloud. This method, without the emulator in the server, will be able to confirm the features of the emulator with a browser using Web Service. This means that the identical service is possible without regard to personal computer or mobile environment. Also, in order to emulating each different web browser engine of the various devices separately, we revise and manage the WebKit engine to be suitable to the characteristics of each device. In the previous design method, the number of emulators which can be shown in a monitor is restricted to 2 or 3. However, we show that the proposed design method can improve the performance of server to the extent that this method could operate more than 100 emulators per each server.