• Journal of Broadcast Engineering
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• v.23 no.6
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• pp.824-835
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• 2018

In this study, the impact on the number of cable TV subscribers as well as the profit of cable TV has been examined, and the impact on enlarging the digital broadcast viewing rights of cable TV subscribers and viewers' welfare has also been examined. We investigated the trends in the number of analog and 8VSB subscribers and revenue of cable TV operators by region and analyzed based on changes in the number of channels provided by each operator. The results show that analog subscribers and digital subscribers are delaying their departure through 8VSB conversion, and VOD subscription fees and home shopping transmission fees have a significant impact on operating profit. Subscribers, as they switched over to 8VSB, have become able to view channels of various genres with clear picture quality for a same subscription fee, and the program providers could offer programs to more customers. The government's deregulation policy due to the changes in broadcasting environment led to the facilitation of digital conversion of Pay-TV and improvement of viewers' welfare.

• Journal of Broadcast Engineering
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• v.7 no.2
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• pp.153-167
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• 2002

With the advent of digital broadcasting, a large number of program channels become available at the user terminals such as set-top-box or PC. Channel navigation and searching become more difficult at TV terminal sides using a conventional device such as a TV remote controller. The MPEG-7 MDS (Multimedia Description Scheme) and TV Anytime set up a standard about how to describe user preferences for genre, channel, actor/actress, keyword, etc. of the TV programs, and how to describe usage history for user's program consumption behaviors and preferences. But they do not describe how to use them. In this paper, we describe an IPG (Intelligent Program Guider) system that provides TV program and channel information based on user preferences and suggest easy access to TV program that user wants. The IPG monitors user's behaviors of interacting to programs and automatically updates the user's preference changes according1y. The IPG utilizes user preferences description scheme specified in both MPEG-7 MDS and TV Anytime metadata specifications.

• Convergence Security Journal
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• v.14 no.2
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• pp.11-16
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• 2014

Recently, request of IPTV was increase. It is a multi-screen service by used TV, PC, and smart-phones. Especially, IPTV and smart-phone linked multi-screen service are very growth by user's recommends. Now, IPTV have a security service partial and multi-screen service. But smart-phone and multi-screen service don't have security service. And authentication service for smart-phone and IPTV linked multi-screen service is don't.. Therefore, We propose that user authentication system for multi-screen service with IPTV and multi-device linked authentcation services. Our proposed system base on Kerberos, so proposal is easy and fast about user authentication. This have simple procedures and more secure services against of PKI. So, our system can support secure multi-screen services against various security threats in multi-screen environments.

• Journal of Broadcast Engineering
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• v.12 no.5
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• pp.435-444
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• 2007

In this paper, we presented the concept and some methods to watch online video clips related to a TV program on atelevision which is called lean-back media, and we simulated our concept on a PC system. The key point of this research is suggesting a new service model to TV viewers and the TV industry, which the model provides simple and easy ways to watch online video clips on a TV screen. The paper defined new tags for metadata and algorithm for the model, then showed simple example using those metadata. At the end, it mentioned the usage of the model in the digital broadcasting environment and discuss about the issues which should handle as future works.

• Journal of KIISE:Computer Systems and Theory
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• v.33 no.10
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• pp.709-721
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• 2006

The traditional broadcasting services over terrestrial, satellite and cable media have been unidirectional mass media regardless of TV viewer's preferences. Recently ich media streaming has become possible via the broadb and networks. Furthermore, since bidirectional communication is possible, personalcasting such as personalized streaming services has been emerging by taking into account the user's preference on content genres, viewing times and actors/actresses etc. Accordingly, personal media becomes an important means for content provision service in addition to the traditional broadcasting service as mass media. In this paper, we introduce a user profile reasoning method for target advertisement which is considered an important application in personalcasting service. The proposed user profile reasoning method predicts an unknown TV viewer's gender and ages by analyzing TV Viewing history data. Based on the estimated user's gender and ages, a target advertisement is provided with TV Anytime metadata. A proposed target advertisement system is developed based on the user profile reasoning and the target advertisement selection method. To show the effectiveness of our proposed methods, we present a plenty of experimental results by using realistic TV viewing history data.

• Journal of Broadcast Engineering
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• v.15 no.4
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• pp.563-581
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• 2010

In this paper, we perform subjective visual quality assessments on UHD video for UHD TV services and analyze the assessment results. Demands for video services have been increased with availabilities of DTV, Internet and personal media equipments. With this trend, the demands for high definition video have also been increasing. Currently, 2K-HD ($1920{\times}1080$) video have been widely consumed over DTV, DVD, digital camcoders, security cameras and other multimedia terminals in various types, and recently digital cinema contents of 4K-UHD($3840{\times}2160$) have been popularly produced and the cameras, beam projects, display panels that support for 4K-UHD video start to come out into multimedia markets. Also it is expected that 4K-UHD service will appear soon in broadcasting and telecommunications environments. Therefore, in this paper, subjective assessments of visual quality on resolutions, color formats, frame rates and compression rates have been carried to provide basis information for standardization of signal specification of UHD video and viewing environments for future UHDTV. As the analysis on the assessments, UHD video exhibits better subjective visual quality than HD by the evaluators. Also, the 4K-UHD test sequences in YUV444 shows better subjective visual quality than the 4K-UHD test sequences in YUV422 and YUV420, but there is little perceptual difference on 4K-UHD test sequences between YUV422 and YUV420 formats. For the comparison between different frame rates, 4K-UHD test sequences of 60fps gives better subjective visual quality than those of 30fps. For bit-depth comparison, HD test sequences in 10-bit depth were little differentiated from those in 8-bit depth in subject visual quality assessment. Lastly, the larger the PSNR values of the reconstructed 4K-UHD test sequences are, the higher the subjective visual quality is. Against the viewing distances, the differences among encoded 4K-UHD test sequences were less distinguished in longer distances from the display.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2016.11a
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• pp.184-186
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• 2016

기술의 발전으로 방송환경이 다양화되면서 전문가가 아니어도 단순한 제작 환경에서 직접 콘텐츠를 제공할 수 있는 개인 방송 산업 규모가 점차 증가하고 있다. 그로 인해 개인 방송 제작자들은 필요에 의해 선택적으로 최적의 시스템을 구성하기 위한 기술들을 요구하고, 개인 방송 시청자들은 PC뿐만 아니라 모바일 등의 선호하는 디스플레이 장치를 선택하여 언제 어디서나 시청하는 것을 원한다. 이를 위해서는 제작자와 시청자를 고려한 개인방송 서비스 모델 및 기술을 제공하는 것이 필요하다. 이에 본 논문에서는 IP 네트워크 및 클라우드 컴퓨팅 환경을 활용하여 제작에서부터 전송 및 표출에 대한 전체적인 시스템 기술과 서비스 모델에 대해 논한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.04a
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• pp.997-1000
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• 2015

스마트폰 및 태블릿 PC 보급의 빠른 확산으로 인해 e-learning 학습환경도 빠른 속도로 모바일 환경으로 전환되고 있다. 이러한 변화에 맞추어 e-learning 서비스업체들도 모바일 서비스를 앞다투어 제공하고 있으며 앞으로도 그 수는 계속 늘어날 것으로 예측된다. 하지만 아직까지는 PC에서 보던 학습 동영상을 단지 모바일 환경에 보는 수준이며 수강생이 온라인 강의를 시청하다 강사에게 실시간으로 질문을 하고 답변을 받는 등의 의사소통은 어렵다. 이러한 단점을 극복하고 강사와 수강생이 웹 환경에서 원활한 의사소통이 가능하며, 많은 수의 수강생이 동시에 접속할 수 있는 HTML5의 WebSocket과 Canvas를 기반으로 한 실시간 문제풀이 시스템을 제안하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.907-910
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• 2011

IPTV나 DTV에서 사용하는 CAS는 하나의 스트리밍으로 하나의 콘텐츠만을 전송하는 환경이지만 SVC와의 결합을 통해 사용자의 다양한 비디오 어플리케이션을 단일 스트리밍으로 지원하도록 개선할 수 있다. 이러한 환경에서는 효율성을 우선적으로 설계하여야 하며, 서비스 등급별 과금 정책을 위해 계층적 키 관리 기법의 적용이 필요하다. 본 논문에서는 CAS에 SVC를 적용함에 있어 발생할 수 있는 문제점들에 대해 살펴보고 CAS환경에서의 SVC 암호화기법에 대해 제안한다. 제안하는 기법의 안전성은 기존 CAS와 단방향 해시 함수의 안전성에 기반하며, 기존 CAS에 비교적 적은 오버헤드로 적용이 가능하다는 장점이 있다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2009.11a
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• pp.173-176
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• 2009

본 논문에서는 영상 정보와 오디오 정보 분석을 이용하여 TV 골프 방송 프로그램에서 중요 이벤트 구간을 검출하고 요약 하는 알고리즘을 제안한다. 제안하는 알고리즘에서는 입력되는 TV 골프 동영상을 영상 신호와 오디오 신호로 분리한 후에, 연속적인 오디오 스트림을 내용 기반의 오디오 구간으로 분류한 뒤 오디오 이벤트 구간을 검출하고, 이와 병렬적으로 영상정보에서 선수들의 플레이 장면을 검출한다. 플레이 장면 검출에 있어서는 방송 환경이나 날씨 등의 변화하는 다양한 조건에 대해 플레이 장면에 대한 오프라인 모델과 함께 경기 내에서 발생한 온라인 모델에 대한 학습을 혼합 적용함으로써 검출 성능을 높였다. 오디오 신호로부터 관중들의 박수소리와 스윙 사운드를 통해 검출된 오디오 이벤트와 플레이 장면은 이벤트 장면 검출 및 요약본 생성을 위해 사용된다. 제안된 알고리즘은 멀티 모달 정보를 이용하여 이벤트 구간 검출을 수행함으로써 중요 이벤트 구간 검출의 정확도를 높일 수 있었고, 검출된 이벤트 구간에 대한 요약본 생성을 통해 골프 경기를 시청하는 사용자가 원하는 부분을 빠르게 브라우징하여 시청하는 것이 가능하여 높은 사용자 만족도를 얻을 수 있었다.