• 한국산업정보학회논문지
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• 제16권2호
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• pp.39-47
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• 2011

Adapting content services to the needs of the users requires content adaptation for context and sensibility. Adapting to context may necessitate distinguishing between video delivery to a PC versus a smart phone, while adapting to sensibility may necessitate between video delivery outside, in a quiet environment, or at home, or offering different movie choices on a sunny summer day, a cold winter day or a holiday season. One key area to address in providing adaptive content services is the design of the delivery system architecture of the adaptive content server. This paper describes several alternatives for this architecture, and outlines some additional concerns that must be considered when the chosen architecture is implemented.

• ETRI Journal
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• 제32권5호
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• pp.665-675
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• 2010

Recent research on mobile Internet protocol television and digital right management (DRM) interconnections has focused on multimedia technologies designed to enhance content scalability and adaptive content distribution. However, due to the architectural and scalable limitations, recent systems are not flexible and securable with respect to their adaptive content distribution and protective policy management. Therefore, we propose a content protective multi-agent platform that provides secure multimedia services, correlation management, pattern-based management, and multi-source multi-use (MsMu)-based services. Our architecture, supported by DRM, lets us create a rich set of MsMu-based content protection and seamless multimedia services through the extension of one source multi-use (OsMu)-based content services. We have verified our platform, which provides scalable and securable services with a 17% lower service response time by using a testbed.

• 한국컴퓨터정보학회논문지
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• 제9권3호
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• pp.149-155
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• 2004

본 논문은 응용수준 액티브네트워크(ALAN)상에서 자치 적응성(Self-Adaptation) 컨텐츠 서비스 네트워크(CSN)에 관하여 언급하였다. 최근에는 컨텐츠 전송에 초점을 둔 CDN(Content Delivery Network)기술과 더불어 서비스 전송에 초점을 둔 CSN(Content Service Network)이 등장하였다. 그리고 CSN과 관련하여 IETF(Internet Export Task Force)에서는 OPES(Open Pluggable Edge Service)표준의 표준화가 진행 중에 있다. 그러나 최근에 유비쿼터스 컴퓨팅 환경의 도래와 함께 망에서는 사용자의 자주 변화하는 제약조건에 맞는 서비스를 제공하기 위한 자치적응성(self-adaptation)이 요구되고 있다. 기존 CDN/CSN는 자치 적응성의 고려가 부족하다. 왜냐하면 기존 망이 이러한 기능을 현재 지원할 수 없기 때문이다. 그러므로 본 논문에서는 이러한 문제를 해결하기 위해서 망에서 기능성 제공이 가능한 액티브네트워크 상의 자치적응성 CSN의 구조를 제안하였다.

• 방송공학회논문지
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• 제22권1호
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• pp.95-106
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• 2017

디지털 방송 통신 기술의 발전에 따라 고화질 방송 서비스와 함께 컴패니언 스크린 서비스에 대한 관심이 높아지고 있다. 개인 모바일 디바이스 사용이 확산됨에 따라 주 스크린에서 양질의 방송을 제공 하는 것 뿐 아니라 세컨드 스크린에서 부가적인 가치를 창출하는 것도 중요하다. 본 논문에서는 사용자의 컨텍스트에 의거하여 적응적인 컴패니언 서비스를 만드는 플랫폼과 관련 저작 도구를 제안한다. 이를 위해 사용자의 상황에 기반하여 원격으로 리소스를 모으고 조합하여 적응적인 컴패니언 스크린 서비스를 공급하는 플랫폼을 설계하였고 실제 서비스 환경에 맞게 구현하였다. 제안하는 플랫폼은 사용자의 다양한 컨텍스트와 사업자의 요구를 고려하여 양질의 컨텐츠를 실시간 구성하고 사용자에게 제공할 수 있으며 플랫폼 기반 저작 도구는 숙련되지 않은 디자이너와 서비스 기획자도 적응적 컴패니언 스크린 서비스를 쉽고 빠르게 만들 수 있도록 한다. 설계한 플랫폼을 이용하여 인터랙티브 서비스 제공이 가능한 한국 UHD IBB 표준을 준수하는 컴패니언 스크린 서비스 컨텐츠를 만들고 시뮬레이션 하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권5호
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• pp.2544-2557
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• 2019

Adaptive bitrate streaming is a crucial element in the implementation of high-quality streaming of media content over the Internet. Dynamic adaptive streaming over HTTP (MPEG-DASH) has lately emerged as the de facto solution for over-the-top (OTT) video streaming services. In this paper, we perform macro-level analysis on a real-world MPEG-DASH-based Internet live broadcasting service to gain insight into its behavior throughout the end-to-end service-provision chain, from broadcasters to viewers. Based on this analysis, we propose methods to improve the quality-of-experience (QoE) of MPEG-DASH-based services, particularly with regard to reducing broadcasting delays between recording and viewing of videos, as well as synchronizing client terminals.

• 정보과학회 논문지
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• 제42권8호
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• pp.1039-1048
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• 2015

최근 웹 기반의 적응적 스트리밍 서비스인 DASH (Dynamic Adaptive Streaming over HTTP)가 주목 받고 있다. 그러나 기존 DASH 환경에서 네트워크와 버퍼 기반의 품질 조절 기법은 콘텐츠의 VBR (Variable Bit Rate) 특성을 고려하지 않아 세그먼트 처리량의 변화가 크며 이로 인해 잦은 품질 변화, 영상의 끊김과 같은 사용자 체감품질이 저하되는 문제점을 발생시킨다. 본 논문에서는 DASH 환경에서 사용자 체감품질을 향상시키기 위해 C-DASH (Content Characteristics based Dynamic Adaptive Streaming over HTTP) 기법을 제안한다. C-DASH 기법은 세그먼트의 처리량과 버퍼 상태, 그리고 콘텐츠의 세그먼트 크기를 고려하여 끊김 없고 비디오 품질 변화가 적은 품질 조절을 수행한다. 실험 결과를 통해 제안한 기법이 기존 품질 조절 기법들에 비해 사용자 체감품질을 향상시킴을 확인하였다.

• ETRI Journal
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• 제36권5호
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• pp.819-828
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• 2014

To solve the increasing popularity of video streaming services over the Internet, recent research activities have addressed the locality of content delivery from a network edge by introducing a storage module into a router. To employ in-network caching and persistent request routing, this paper introduces a hybrid content delivery network (CDN) system combining novel content routers in an underlay together with a traditional CDN server in an overlay. This system first selects the most suitable delivery scheme (that is, multicast or broadcast) for the content in question and then allocates an appropriate number of channels based on a consideration of the content's popularity. The proposed scheme aims to minimize traffic volume and achieve optimal delivery cost, since the most popular content is delivered through broadcast channels and the least popular through multicast channels. The performance of the adaptive scheme is clearly evaluated and compared against both the multicast and broadcast schemes in terms of the optimal in-network caching size and number of unicast channels in a content router to observe the significant impact of our proposed scheme.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권8호
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• pp.3804-3819
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• 2018

The increasing popularity of HTTP adaptive video streaming services has dramatically increased bandwidth requirements on operator networks, which attempt to shape their traffic through Deep Packet inspection (DPI). However, Google and certain content providers have started to encrypt their video services. As a result, operators often encounter difficulties in shaping their encrypted video traffic via DPI. This highlights the need for new traffic classification methods for encrypted HTTP adaptive video streaming to enable smart traffic shaping. These new methods will have to effectively estimate the quality representation layer and playout buffer. We present a new machine learning method and show for the first time that video quality representation classification for (YouTube) encrypted HTTP adaptive streaming is possible. The crawler codes and the datasets are provided in [43,44,51]. An extensive empirical evaluation shows that our method is able to independently classify every video segment into one of the quality representation layers with 97% accuracy if the browser is Safari with a Flash Player and 77% accuracy if the browser is Chrome, Explorer, Firefox or Safari with an HTML5 player.

• 한국멀티미디어학회논문지
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• 제8권6호
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• pp.814-826
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• 2005

The user-centric broadcasting environment includes the agent system and personalized broadcasting services for user-adaptive TV watching. In this paper, we propose broadcasting environment consisting of personalized broadcasting services and a multi-agent broadcasting system for the services. The proposed system employs the intelligent agent technology of the Foundation for Intelligent Physical Agents (FIPA) as well as metadata technology of MPEG-7 and TV-Anytime Forum (TVAF). To verify the usefulness of the proposed environment, we implemented a test-bed and demonstrated the proposed agent system with three services including intelligent user-information management service, information mobility service, and content retrieval service.

• 한국IT서비스학회지
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• 제8권4호
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• pp.187-199
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• 2009

Content services for silver users on the ubiquitous technologies are getting attention as a new business model, monitoring users in real-time on the real-world and/or cyber-world. A lot of business and service model have been developed to apply silver or elder user. This study explained a state-of-the-art silver IT service to innovative services for users, ranging from home and finance to support for healthcare and living. Due to the variation of subtle terminologies, this study was conducted to restructure an adaptive terminology including some definitions. Current silver IT service model has been evaluated from the technical, functional, and business analyst, and its suitability has also been expressed in a proposed model and service. The purpose of this study was to propose a systematic approach of new IT service business model for silver users. A proposed model was described to explain the feasibility of the silver IT industry.