• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.4
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• pp.1000-1006
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• 2014

This study focuses on the fact that a OTT service is vigorously used for smart phones, and suggests a design of method to trace the experiences of watching television contents. For this purpose, we developed logging functions and embedded them into existing OTT service application to record flow and pattern of watching context. This paper suggests a log file format which can accurately and precisely record watching actions of users per-second methodology rather than former per-minute methodology. Moreover, this study shows that the application can trace watching attitude according to occurring events by characteristics and playing modes of realtime broadcasting, VOD, advertisement contents. In addition, based on the result of the study, this paper discusses educational, operational meaning of the method such as methodological application in mobile ethnography field or survey for total screening rate.

• Journal of Digital Convergence
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• v.15 no.9
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• pp.471-477
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• 2017

This paper deals with the viewing rate trends of digital media service special reference to terrestrial real time broadcasting of IPTV. In a few years, TV viewership of young people is decreasing, the audience viewing rate of the terrestrial broadcasting which is the representative of the media decreases, and the change of the broadcasting industry is progressing. Especially after the terrestrial broadcaster 's VOD holdback was extended, the viewer' s movement on the competitive channel & mobile media was rapidly progressing. Researcher assumed that the viewing rate of the terrestrial real-time broadcasting has influenced the comprehensive channel, CJ E&M subsidiary channels. As a result, researcher verified using statistical methodological time series analysis and regression analysis. Based on these results, researcher expects media players to prepare policies for viewers' satisfaction and symbiotic growth of markets.

• The Journal of the Korea Contents Association
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• v.15 no.5
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• pp.36-46
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• 2015

The purpose of this study is to investigate the characteristics of diverse contents service of EBS providing on the multi-platform in the era of smart media. This study investigated contents service of EBS in order to seek and suggest EBS's competitiveness in the era of smart media environment. As a result, EBS is providing real-time service, VOD and e-learning, but its current contents service is concentrated on providing e-learning service. This study recommended that EBS need to reinforce contents suitable for various multi-platform uses. It also suggested EBS need to cooperate with diverse webs service and SNS service in order to widen openness of its platform, and to provide not only diverse contents, but also applications by offering mobile and on-demand contents and services. Finally, this study proposed that EBS is needed to move towards a more public and comprehensive media portal.

• Proceedings of the Korea Contents Association Conference
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• 2008.05a
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• pp.494-497
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• 2008

DIMPEC, Direct Interactive Motion Picture Electronic Commerce technique is not only that gain additional detail information on the entry properties and actor custom by seeing and hearing VOD and TV drama with internet but also source technology which can buy product using electronic commerce. Also, this is enable to construct in variety platform environment like internet, PDA, MOBILE, Settop box, and this is a technology where competition is very high due to application is possible to satellite DMB, and DMB for ground which is high technology IT. DIMPEC is expected that next generation business model will be formed by combining to user participation, consumption magnification of mobile contents, advancement and intelligence of internet service which is next generation internet business model which combines this technique.

• 한국HCI학회:학술대회논문집
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• 2006.02b
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• pp.175-178
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• 2006

1990 년대부터 본격적으로 시작된 국내 휴대폰의 역사는 불과 10 년 사이에 전체 인구 중 3600 만명 이상의 가입자가 휴대폰을 사용하고 있는 모바일 강국으로 발전하였다. 국내 이동통신사들의 다양한 서비스 전략과 단말 제조사들의 다양한 기술의 발전으로 휴대폰은 단순한 전화기능만을 담당하는 커뮤니케이션 디바이스(Communication Device)에서 다양한 VOD, AOD 서비스들의 도입으로 엔터테인먼트 디바이스(Entertainment Device)로 발전했고, DMB, TV, MP3, 카메라 등 다양한 디바이스들이 결합된 컨버전스 기능성 기기(Functional Device)로 발전해 가고 있다. 이런 과정에서 사용자들은 휴대폰에서 다양한 경험을 하게 된다. 본 연구는 다양한 매체와 디바이스가 결합 된 모바일 환경 속에서 이동통신사와 제조사의 관점에서 분석한 자료를 바탕으로 하나의 통합된 경험을 사용자들에게 제공할 수 있는 방법을 고찰해 보고자 한다. 휴대폰을 만드는 제조업체가 수행하는 경험 디자인은 이동통신사에 상관없이, 자사의 경험 통일성(identity)을 강조하게 되고, 이동통신사는 제조업체와 상관없이 자사의 경험 통일성을 강조하게 된다. 통일성 뿐만 아니라 기능이나 직무(task)의 중요성도 다르기 때문에 경험 디자인을 위한 우선순위도 다르게 된다. 이것의 결과는 모두 사용자가 떠 앉게 된다. 즉 사용자의 경험이 복잡해지게 되고 이것은 장기적으로 제조업체 및 이동통신사 모두에게 불이익을 주게 된다. 본 논문에서는 제조사와 이통사를 위한 사용자 경험 모형을 세웠고, 각 요소별로 접근 방법의 차이에 대해 논의를 하였다. 사용자가 휴대폰 경험에서 혼돈을 적게 하기 위해서는 제조사와 이통사의 인터랙션은 서로 일관성이 있어야 하고, 스타일 부문에서는 서로간의 입장차이가 좁히기 쉽지 않으므로 둘 다 사용자의 선택의 폭을 넓혀주는 방향으로 진행을 한다. 기획단계에서 부터 협력을 함으로써 양사의 갭을 줄일 수 있다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.4B
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• pp.183-190
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• 2007

The cdma2000 mobile network covers a wide area but its characteristics are high cost and low bandwidth. On the other hand, WLAN covers a small area like a hot spot area but its characteristics are large bandwidth and low cost. Thus we can provide efficient services when we employ an integration network between WLAN and cdma2000 mobile networks. In this paper, we propose an integration scheme between WLAN and cdma2000 mobile networks. In addition, we design and implement the dual mode terminal which receives seamless data services in the integrated network. The proposed dual mode terminal manages connections by monitoring the signal strength of WLAN and selecting a proper network. We validate the functions through the implementation of VOD and show the effectiveness through the performance measurement.

• Journal of Korea Multimedia Society
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• v.14 no.1
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• pp.54-75
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• 2011

PoC(Push-to-talk Over Cellular) is an integrated technology of group voice calls, video calls and internet based multimedia services. If a PoC user can not participate in the PoC session for various reasons such as an emergency situation, lack of battery capacity, then the user can use the PoC Box which has a similar functionality to the MM Box in the MMS(Multimedia Messaging Service). The RTSP(Real-Time Streaming Protocol) method is recommended to be used when there is a transmission session between the PoC box and a terminal. Since the existing VOD service uses a wired network, the packet size of RTSP-based VOD service is huge, however, the PoC service has wireless communication environments which have general characteristics to be used in RTSP method. Packet loss in a wired communication environments is relatively less than that in wireless communication environment, therefore, a buffering latency occurs in PoC service due to a play-out delay which means an asynchronous play of audio & video contents. Those problems make a user to be difficult to find the information they want when the media contents are played-out. In this paper, the following techniques and methods were proposed and their performance and superiority were verified through testing: cross-over dual reception buffering technique, advance partition multi-reception buffering technique, and on-demand multi-reception buffering technique, which are designed for effective picking up of information in media content being transmitted in short amount of time using RTSP when a user searches for media, as well as for reduction in playback delay; and same-priority packetization transmission method and priority-based packetization transmission method, which are media data packetization methods for transmission. From the simulation of functional evaluation, we could find that the proposed multiple receiving buffering and packetizing methods are superior, with respect to the media retrieval inclination, to the existing single receiving buffering method by 6-9 points from the viewpoint of effectiveness and excellence. Among them, especially, on-demand multiple receiving buffering technology with same-priority packetization transmission method is able to manage the media search inclination promptly to the requests of users by showing superiority of 3-24 points above compared to other combination methods. In addition, users could find the information they want much quickly since large amount of informations are received in a focused media retrieval period within a short time.

• Journal of Broadcast Engineering
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• v.16 no.1
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• pp.23-32
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• 2011

Design and Implementation of Clipcast Service via Terrestrial DMB This paper outlines the system design and the implementation process of clipcast service that can send clips of video, mp3, text, images, etc. to terrestrial DMB terminals. To provide clipcast service in terrestrial DMB, a separate data channel needs to be allocated and this requires changes in the existing bandwidth allocation. Clipcast contents can be sent after midnight at around 3 to 4 AM, when terrestrial DMB viewship is low. If the video service bit rate is lowered to 352 Kbps and the TPEG service band is fully used, then 320 Kbps bit rate can be allocated to clipcast. To enable clipcast service, the terminals' DMB program must be executed, and this can be done through SMS and EPG. Clipcast service applies MOT protocol to transmit multimedia objects, and transmits twice in carousel format for stable transmission of files. Therefore, 72Mbyte data can be transmitted in one hour, which corresponds to about 20 minutes of full motion video service at 500Kbps data rate. When running the clip transmitted through terrestrial DMB data channel, information regarding the length of each clip is received through communication with the CMS(Content Management Server), then error-free files are displayed. The clips can be provided to the users as preview contents of the complete VOD contents. In order to use the complete content, the user needs to access the URL allocated for that specific content and download the content by completing a billing process. This paper suggests the design and implementation of terrestrial DMB system to provide clipcast service, which enables file download services as provided in MediaFLO, DVB-H, and the other mobile broadcasting systems. Unlike the other mobile broadcasting systems, the proposed system applies more reliable SMS method to activate the DMB terminals for highly stable clipcast service. This allows hybrid, i.e, both SMS and EPG activations of terminals for clipcast services.