• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.41 no.3
• /
• pp.359-364
• /
• 2016

As cable TV networks have a media feature that is a broadband wire network, they can provide not only TV broadcasting services but also communication services. Accordingly, the cable TV network is mentioned as the optimal network for convergence of broadcasting and communication services. Recently, Available frequencies of the cable TV network have become insufficient as enhancement of video quality, increment of VoD service, and growth of high-speed internet service. This paper presents a new implementation method of switched digital video (SDV) technology that is introduced for obtaining additional frequency band. In the SDV system, only TV channels requested from viewer are sent and non-requested channels are dropped. The presented SDV uses a sharing method of TV broadcasting and communication service in a same frequency band. This method shows increase of spectrum efficient from switching of TV service channels without building a complex system.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2018.01a
• /
• pp.211-212
• /
• 2018

본 논문에서는 문화콘텐츠 캐릭터를 3D모델링 도구를 이용하여 디자인하고 3D 프린팅 기술을 접목하여 출력하여 판매하고자 하는 창업에 대한 교육과정을 제시하고자 한다. 이를 위해 첫 단계로서 3D 모델링 도구의 전반적인 특성을 살펴보고 3D 캐릭터 모델링 교육을 위한 교육과정으로 어떠한 교과목들이 제시되어야 하는지 제시해보고자 한다.

• Proceedings of the KIEE Conference
• /
• 2004.11c
• /
• pp.304-306
• /
• 2004

With the developing of current multimedia broadcasting, user will be provided for lots of various content through the various channel and media. Content provider and consumer want the various service using content with the better quality which is fit to users' preference. For transmitting this content in the limited transmission channel capacity, it needs to transmit the highly compressed content. The content of 3D mesh model-based on MPEG-4 enables the various content service that provides the lower size and the resonable quality, and Personalize(Targeting) service just provide the contents that user more wants and likes. This paper presents the study on the targeting service using compression of 3D mesh model-based on MPEG-4 and the adaptation of Embedded Graphic application program using it.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.8 no.5
• /
• pp.205-210
• /
• 2008

In previous paper, we introduced 3d acquisition system with CCD cameras, but it was not distinguished from other 3d acquisition system with PSD camera. In this paper, we introduce the 3d data acquisition system using by stereo method with two cameras, show the calibration method of two cameras, and present 3d acquisition methods. we tried to improve the accuracy of 3d data acquisition and implemented the proposed methods. According to the result, we found that the proposed algorithms can boost the accuracy highly against the previous works. The proposed methods are to remove distortion on input images and adjust z axis. We describes the performance in the result.

• Electronics and Telecommunications Trends
• /
• v.36 no.4
• /
• pp.72-80
• /
• 2021

Multimedia broadcast multicast services (MBMS) have evolved to accommodate broadcasting services in 3GPP standards. One long-standing approach is to comprise the multimedia broadcast multicast service single-frequency network based on the cellular networks of mobile operators, and another approach adds a broadcasting network to 3GPP standards. In this paper, we overview the MBMS architecture and key entities in MBMS services. In addition, the trends of MBMS are discussed in terms of technology and 3GPP standards, where MBMS functionality is described according to 3GPP releases. Finally, we discuss its capability through a comparison with ATSC 3.0, which is the latest terrestrial broadcasting standard, and then we present the current status and future perspectives of MBMS in 3GPP.

• International Journal of Internet, Broadcasting and Communication
• /
• v.6 no.2
• /
• pp.13-16
• /
• 2014

This study aims to examine the effects of watching 2D and 3D images on the blink rate. Regarding the image watch, their blink rate for 2D and 3D images was separately checked for 1 minute in the 1m distance, before the watch, after 15 minutes of watch, and after 30 minutes of watch. About the change of their blink rate in the 2D image watch, it tended to become higher than that before watching the image; however, there was no statistical significance (paired t-test, p=0.106, p=0.062). And in the 2D image watch, it tended to increase in comparison between after 15 minutes and after 30 minutes, but there was no statistical significance (paired t-test, p=0.623). Meanwhile, about the change of their blink rate in the 3D image watch, it tended to decrease statistically significantly both after 15 minutes and after 30 minutes when compared with that before watching the image (paired t-test, p=0.000, p=0.000). In the 3D image watch, it tended to increase in comparison between after 15 minutes and after 30 minutes; however, there was no statistical significance (paired t-test, p=0.867).

• Broadcasting and Media Magazine
• /
• v.15 no.2
• /
• pp.81-87
• /
• 2010

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2004.11a
• /
• pp.211-214
• /
• 2004

본 논문에서는 사용자의 입력에 따라 3차원 오디오 장면을 재구성하여 전달할 수 있는 대화형 오디오 방송단말의 구현 예를 제시한다. MPEG-4 AudioBIFS 규격에 따라 계층적으로 표현한 오디오 장면의 속성을 사용자의 입력에 따라 갱신하고, 주어진 속성을 참조하여 오디오 데이터를 3차원 공간상에 재합성하는 방식을 취한다 속성을 갱신하는 모듈은 MPEG-4 Audio 프로파일을 지원하게 하되 AudioBIFS 노드 유형에 따른 사용자 인터페이스를 미리 정의하여 단말 측에 저장해 두고 이용함으로써 대화형 방송 서비스를 구현했다. 3차원 오디오 데이터를 재생하는 기능은 사용자의 입력에 대한 피드백을 풍부하게 하여 대화형 방송의 효과를 극대화하고, 사실감을 제고하는 데 중요한 역할을 담당한다. 요소기술로 음상의 위치, 지향성, 모양, 잔향특성 등을 구현하기 위한 3차원 오디오 기술에 대해 소개한다. 또한 대화형 3차원 오디오 방송단말을 이용한 서비스의 예로 대화형 합주 및 합창 프로그램을 소개한다.

• International Journal of Internet, Broadcasting and Communication
• /
• v.14 no.3
• /
• pp.22-29
• /
• 2022

Recently, with the development of mobile computing power, mobile-based VR and AR services are being developed. Due to network performance and computing power constraints, VR and AR services using large-capacity 3D content have limitations. A study on an efficient 3D content load method for a mobile device is required. The conventional method downloads all 3D content used for AR services at the same time. In this paper, we propose an active 3D content load according to the user's track. The proposed method is a partitioned 3D object load. Edge servers were installed for each area and connected through the MESH network. Partitioned load the required 3D object in the area referring to the user's location. The location is identified through the edge server information of the connected AP. The performance of the proposed method and the conventional method was compared. As a result of the comparison, the proposed method showed a stable Mobile AR Service. The results of this study, it is expected to contribute to the activation of edge server-based AR mobile services.

• International Journal of Internet, Broadcasting and Communication
• /
• v.8 no.1
• /
• pp.73-82
• /
• 2016

The computational thinking refers to the ability to solve the complex and a variety of problems by utilizing a computer in core of the software education. It create a model through data collection and analysis and realize that the computer can understand to solve problems. Recently, the educational application of 3D printer appears in importance, which is one method to improve the computing thinking. In this paper, we propose the data analysis framework to stretch the computing thinking of learner that can incorporate 3D printing technology to the current elementary school curriculum and apply in a case study.