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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
Electronics and Telecommunications Research Institute
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Volume & Issues
Volume 26, Issue 6 - Dec 2004
Volume 26, Issue 5 - Oct 2004
Volume 26, Issue 4 - Aug 2004
Volume 26, Issue 3 - Jun 2004
Volume 26, Issue 2 - Apr 2004
Volume 26, Issue 1 - Feb 2004
Selecting the target year
An HDTV-Compatible 3DTV Broadcasting System
Hur, Nam-Ho ; Lee, Gwang-Soon ; You, Woong-Shik ; Lee, Jin-Hwan ; Ahn, Chung-Hyun ;
ETRI Journal, volume 26, issue 2, 2004, Pages 71~71
We introduce a high-definition three-dimensional television (3DTV) broadcasting system that is fully compatible with the existing transmission system of high-definition television (HDTV). Specifically, we developed high-definition 3DTV broadcasting subsystems including a 3DTV camera, 3DTV video multiplexer and demultiplexer, 3DTV receiver, and 3DTV outdoor broadcast van. To verify the developed subsystems, we performed experimental services of 3DTV broadcasting during the 2002 FIFA World Cup Korea/Japan. According to our subjective evaluation test, 88% of 273 viewers rated the perceived depth of 3DTV as “Good,” and 36% of the viewers preferred 3DTV to other digital broadcasting services.
Broadcasting System Compliant with MPEG-2/4 IPMPX
Cho, Yong-Ju ; Seok, Jong-Won ; Hong, Jin-Woo ; Ahn, Chie-Teuk ;
ETRI Journal, volume 26, issue 2, 2004, Pages 83~83
In this paper, we present an intellectual property management and protection (IPMP) system in a broadcasting environment to provide mechanisms for copyright and contents protection that are compliant with the MPEG-2 and MPEG-4 IPMP Extension (IPMPX) specifications. The technology for processing IPMP related information was exploited, and a terminal model has been successfully designed and implemented. In addition, interoperability, which is the main objective of MPEG-2/4 IPMPX, has been addressed in detail. The experimental results show that the implemented system performs the IPMP process well, meeting the requirements of a broadcasting environment.
ATSC Terrestrial Digital Television Broadcasting Using Single Frequency Networks
Lee, Yong-Tae ; Park, Sung-Ik ; Kim, Seung-Won ; Ahn, Chie-Teuk ; Seo, Jong-Soo ;
ETRI Journal, volume 26, issue 2, 2004, Pages 92~92
In this paper, we propose an efficient method to broadcast digital television signals using single frequency networks (SFNs) within the Advanced Television Systems Committee (ATSC) transmission systems. In implementing the SFNs of an 8-vestigial side band (8-VSB) Digital Television (DTV) system, the ambiguity problem of the trellis coder is unavoidable in a conventional ATSC transmission system. We propose a memory initialization of the trellis coder to resolve this ambiguity problem. Since the proposed scheme to synchronize multiple transmitters minimizes the changes from the conventional ATSC system, the hardware complexity for these changes is very low. Our simulation results show that the proposed scheme makes a less than 0.1 dB degradation at the threshold of visibility with a bit error rate of
in the additive white Gaussian noise (AWGN) channel. It is possible to reduce the performance degradation by increasing the initialization period of the proposed scheme.
Near-Optimum Blind Decision Feedback Equalization for ATSC Digital Television Receivers
Kim, Hyoung-Nam ; Park, Sung-Ik ; Kim, Seung-Won ; Kim, Jae-Moung ;
ETRI Journal, volume 26, issue 2, 2004, Pages 101~101
This paper presents a near-optimum blind decision feedback equalizer (DFE) for the receivers of Advanced Television Systems Committee (ATSC) digital television. By adopting a modified trellis decoder (MTD) with a trace- back depth of 1 for the decision device in the DFE, we obtain a hardware-efficient, blind DFE approaching the performance of an optimum DFE which has no error propagation. In the MTD, the absolute distance is used rather than the squared Euclidean distance for the computation of the branch metrics. This results in a reduction of the computational complexity over the original trellis decoding scheme. Compared to the conventional slicer, the MTD shows an outstanding performance improvement in decision error probability and is comparable to the original trellis decoder using the Euclidean distance. Reducing error propagation by use of the MTD in the DFE leads to the improvement of convergence performance in terms of convergence speed and residual error. Simulation results show that the proposed blind DFE performs much better than the blind DFE with the slicer, and the difference is prominent at the trellis decoder following the blind DFE.
A Framework for MPEG-4 Contents Delivery over DMB
Lee, Bong-Ho ; Yang, Kyu-Tae ; Hahm, Young-Kwon ; Lee, Soo-In ; Ahn, Chie-Teuk ;
ETRI Journal, volume 26, issue 2, 2004, Pages 112~112
Digital Multimedia Broadcasting (DMB) is an upcoming standard in Korea used to provide mobile multimedia broadcasting service based on the Eureka-147 Digital Audio Broadcasting (DAB) system. The current dominant multimedia coding standard, MPEG-4, is foreseen to play an important role in forthcoming DMB services. However, the current approaches for transporting MPEG-4 content over DMB networks are not optimized. To address this issue we propose a novel MPEG-4 stream multiplexer, called M4SMux, which provides better stream multiplexing and delivery over DMB networks. M4SMux features an MPEG-4 elementary-stream interleaving mechanism that reduces the multiplexing overhead and a multiplex configuration mechanism that utilizes M4SLinkTable for easy content access. In addition, we propose an error correction method which enhances transport efficiency.
Low-Complexity MPEG-4 Shape Encoding towards Realtime Object-Based Applications
Jang, Euee-Seon ;
ETRI Journal, volume 26, issue 2, 2004, Pages 122~122
Although frame-based MPEG-4 video services have been successfully deployed since 2000, MPEG-4 video coding is now facing great competition in becoming a dominant player in the market. Object-based coding is one of the key functionalities of MPEG-4 video coding. Real-time object-based video encoding is also important for multimedia broadcasting for the near future. Object-based video services using MPEG-4 have not yet made a successful debut due to several reasons. One of the critical problems is the coding complexity of object-based video coding over frame-based video coding. Since a video object is described with an arbitrary shape, the bitstream contains not only motion and texture data but also shape data. This has introduced additional complexity to the decoder side as well as to the encoder side. In this paper, we have analyzed the current MPEG-4 video encoding tools and proposed efficient coding technologies that reduce the complexity of the encoder. Using the proposed coding schemes, we have obtained a 56 percent reduction in shape-coding complexity over the MPEG-4 video reference software (Microsoft version, 2000 edition).
Agent-Based Intelligent Multimedia Broadcasting within MPEG-21 Multimedia Framework
Kim, Mun-Churl ; Lim, Jeong-Yeon ; Kang, Kyeong-Ok ; Kim, Jin-Woong ;
ETRI Journal, volume 26, issue 2, 2004, Pages 136~136
It is expected that an intelligent broadcasting service (IBS) will be able to provide broadcast programs based on user preference and program-associated information (metadata) in order to assist users in easy navigation of the program content being broadcast. In this way, users will be able to access program content anytime, anywhere, and in the manner they wish. This type of IBS will be a basis for future broadcasting services such as customized broadcasting or personal casting. In this paper, we introduce an agent-based multimedia broadcasting framework using the Foundation for Intelligent Physical Agents (FIPA) and MPEG-7 technologies within MPEG-21. We use a FIPA implementation called FIPA open source as a platform for exchanging user preferences and program information as FIPA messages between a server and its clients. The user preference is modeled as the User Preference description scheme in MPEG-7 multimedia description schemes. We discuss a framework structure and implementation for the IBS.
Development of Interactive Data Broadcasting System Compliant with ATSC Standards
Jeong, Jong-Myeon ; Lee, Yong-Ju ; Park, Min-Sik ; Choi, Ji-Hoon ; Choi, Jin-Soo ; Kim, Jin-Woong ;
ETRI Journal, volume 26, issue 2, 2004, Pages 149~149
In this paper, we present an interactive data broadcasting system compliant with the Advanced Television Systems Committee (ATSC) standards. The proposed system provides users not only with various data broadcasting services but also remote interactive services. For various data broadcasting services, we have adopted a synchronized data injector that calculates the transmission time of synchronized data accurately and multiplexes synchronized data with the data of an MPEG-2 audio-visual program according to the calculated transmission time. To support remote interactive services, we designed and implemented a return channel server connected on a bi-directional interaction channel. Test results show that the proposed system provides both an asynchronous and synchronized data broadcasting service and remote interactive service appropriately.
Impedance Spectroscopy of
-Conjugated Organic Materials
Kim, Seong-Hyun ; Chu, Hye-Yong ; Zyung, Taeh-Young ; Yang, Yong-Suk ;
ETRI Journal, volume 26, issue 2, 2004, Pages 161~161
AC electrical properties of organic light-emitting diodes with poly(2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylenevinylene) (MEH-PPV), poly[2,5-bia(dimethyloctylsilyl)-1,4-phenylenevinylene] (BDMOS-PPV), and tris-(8-hydroxyquinolate)-aluminum
as light-emitting materials are studied. The frequency-dependent real and imaginary parts of impedance were fitted using an equivalent circuit. We found that the conduction mechanism is a space-charge limited current with exponential trap distribution.
MaRMI-III: A Methodology for Component-Based Development
Ham, Dong-Han ; Kim, Jin-Sam ; Cho, Jin-Hee ; Ha, Su-Jung ;
ETRI Journal, volume 26, issue 2, 2004, Pages 167~167
As component-based development (CBD) rapidly spread throughout the software industry, a comprehensive methodology is needed to apply it more systematically. For this purpose, a new CBD methodology named Magic & Robust Methodology Integrated III (MaRMI-III) has been developed. The purpose of this paper is to present MaRMI-III by its constituent processes and claim that it can be used to support system developers conduct CBD in a consistent manner. First, we review the CBD approach to system development and the role of CBD methodology, and then we explain the several characteristics of MaRMI-III which are considered necessary to the CBD environment. Next, we explain a process model of MaRMI-III which separates the development process from the project management process and prescribes well-ordered activities and tasks that the developer should conduct. Each phase forming the Process Model is explained in terms of its objectives and main constituent activities. Some techniques and workproducts related to each phase are also explained. Finally, to examine the usefulness of MaRMI-III, an analytical comparison with other CBD methodologies and the results of a questionnaire survey are described.
Performance Evaluation of an XML-Based Conference Control Protocol for Centralized VoIP Conference
Kim, Eun-Sook ; Yi, Jong-Hwa ; Kang, Shin-Gak ; Park, Ki-Shik ;
ETRI Journal, volume 26, issue 2, 2004, Pages 181~181
For communication between heterogeneous conference systems, it is important to build a conference control protocol independent from signaling protocols. We simulate an XML-based conference control that is under consideration as a standard mechanism. We describe the framework and operations for easy implementation in heterogeneous conference systems. The simulation results show that the proposed control protocol provides a consistent service for an increasing number of conferences and participants in small to mid-size centralized conferencing.
A Two-Step Scheduling Algorithm to Support Dual Bandwidth Allocation Policies in an Ethernet Passive Optical Network
Lee, Ho-Sook ; Yoo, Tae-Whan ; Moon, Ji-Hyun ; Lee, Hyeong-Ho ;
ETRI Journal, volume 26, issue 2, 2004, Pages 185~185
In this paper, we design a two-step scheduling algorithm to support multiple bandwidth allocation policies for upstream channel access in an Ethernet passive optical network. The proposed scheduling algorithm allows us a simultaneous approach for multiple access control policies: static bandwidth allocation for guaranteed bandwidth service and dynamic bandwidth allocation for on-demand, dynamic traffic services. In order to reduce the scheduling complexity, we separate the process of the transmission start- time decision from the process of grant generation. This technique does not require the timing information of other bandwidth allocation modules, so respective modules are free from a heavy amount of timing information or complex processing.