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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 24, Issue 6 - Dec 2002
Volume 24, Issue 5 - Oct 2002
Volume 24, Issue 4 - Aug 2002
Volume 24, Issue 3 - Jun 2002
Volume 24, Issue 2 - Apr 2002
Volume 24, Issue 1 - Feb 2002
Selecting the target year
Multimodal Approach for Summarizing and Indexing News Video
Kim, Jae-Gon ; Chang, Hyun-Sung ; Kim, Young-Tae ; Kang, Kyeong-Ok ; Kim, Mun-Churl ; Kim, Jin-Woong ; Kim, Hyung-Myung ;
ETRI Journal, volume 24, issue 1, 2002, Pages 1~1
A video summary abstracts the gist from an entire video and also enables efficient access to the desired content. In this paper, we propose a novel method for summarizing news video based on multimodal analysis of the content. The proposed method exploits the closed caption data to locate semantically meaningful highlights in a news video and speech signals in an audio stream to align the closed caption data with the video in a time-line. Then, the detected highlights are described using MPEG-7 Summarization Description Scheme, which allows efficient browsing of the content through such functionalities as multi-level abstracts and navigation guidance. Multimodal search and retrieval are also within the proposed framework. By indexing synchronized closed caption data, the video clips are searchable by inputting a text query. Intensive experiments with prototypical systems are presented to demonstrate the validity and reliability of the proposed method in real applications.
An Efficient Fault Tolerance Protocol with Backup Foreign Agents in a Hierarchical Local Registration Mobile IP
Hong, Choong-Seon ; Yim, Ki-Woon ; Lee, Dae-Young ; Yun, Dong-Sik ;
ETRI Journal, volume 24, issue 1, 2002, Pages 12~12
A Mobile IP allows IP hosts to move between different networks without changing their IP addresses. Mobile IP systems supporting local registration were introduced to reduce the number of times a home registration with the remotely located home agent was needed. The local registration Mobile IP scheme enhanced performance by processing registration requests of mobile nodes at a local agent. The local registration approach may affect other aspects of the Mobile IP systems such as fault tolerance. In this paper, we briefly review previous solutions for supporting fault tolerance in local registration Mobile IP systems and propose a fault tolerance protocol with a backup foreign agent in a hierarchical local registration mobile IP to enhance the efficiency of such systems against foreign agent failures. We also describe the specification of the proposed protocol using LOTOS and perform its validation using MiniLite. Finally, we analyze the performance of our proposed fault tolerance protocol through simulation.
Efficient Use of MPEG-7 Edge Histogram Descriptor
Won, Chee-Sun ; Park, Dong-Kwon ; Park, Soo-Jun ;
ETRI Journal, volume 24, issue 1, 2002, Pages 23~23
MPEG-7 Visual Standard specifies a set of descriptors that can be used to measure similarity in images or video. Among them, the Edge Histogram Descriptor describes edge distribution with a histogram based on local edge distribution in an image. Since the Edge Histogram Descriptor recommended for the MPEG-7 standard represents only local edge distribution in the image, the matching performance for image retrieval may not be satisfactory. This paper proposes the use of global and semi-local edge histograms generated directly from the local histogram bins to increase the matching performance. Then, the global, semi-global, and local histograms of images are combined to measure the image similarity and are compared with the MPEG-7 descriptor of the local-only histogram. Since we exploit the absolute location of the edge in the image as well as its global composition, the proposed matching method can retrieve semantically similar images. Experiments on MPEG-7 test images show that the proposed method yields better retrieval performance by an amount of 0.04 in ANMRR, which shows a significant difference in visual inspection.
Rain Attenuation and Doppler Shift Compensation for Satellite Communications
KimShin, Soo-Young ; Lim, Kwang-Jae ; Choi, Kwon-Hue ; Kang, Kun-Seok ;
ETRI Journal, volume 24, issue 1, 2002, Pages 31~31
In high-speed multimedia satellite communication systems, it is essential to provide high-quality, economical services by using efficient transmission schemes which can overcome channel impairments appearing in the satellite link. This paper introduces techniques to compensate for rain attenuation and the Doppler shift in the satellite communication link. An adaptive transmission technique with a control algorithm to adaptively allocate transmission schemes is used as a countermeasure to rain attenuation. We introduce a new rain attenuation modeling technique for estimating system performance and propose a novel Doppler shift compensation algorithm with reduced hardware complexity. Extensive simulation results show that the proposed algorithm can provide greatly enhanced performance compared to conventional algorithms. Simulation software and hardware which incorporate the proposed techniques are also demonstrated.
Flow-Based Admission Control Algorithm in the DiffServ-Aware ATM-Based MPLS Network
Lee, Gyu-Myoung ; Choi, Jun-Kyun ; Choi, Mun-Kee ; Lee, Man-Seop ; Jong, Sang-Gug ;
ETRI Journal, volume 24, issue 1, 2002, Pages 43~43
This paper proposes a flow-based admission control algorithm through an Asynchronous Transfer Mode (ATM) based Multi-Protocol Label Switching (MPLS) network for multiple service class environments of Integrated Service (IntServ) and Differentiated Service (DiffServ). We propose the Integrated Packet Scheduler to accommodate IntServ and Best Effort traffic through the DiffServ-aware MPLS core network. The numerical results of the proposed algorithm achieve reliable delay-bounded Quality of Service (QoS) performance and reduce the blocking probability of high priority service in the DiffServ model. We show the performance behaviors of IntServ traffic negotiated by end users when their packets are delivered through the DiffServ-aware MPLS core network. We also show that ATM shortcut connections are well tuned with guaranteed QoS service. We validate the proposed method by numerical analysis of its performance in such areas as throughput, end-to-end delay and path utilization.
Mergers and Acquisitions in the Telecommunications Industry: Myths and Reality
Park, Myeong-Cheol ; Yang, Dong-Hoon ; Nam, Chan-Gi ; Ha, Young-Wook ;
ETRI Journal, volume 24, issue 1, 2002, Pages 56~56
This paper investigates how market participants react to mergers and acquisitions (M&As) involving telecommunications companies. The empirical evidence suggests that such activities convey bad news to the market. This is consistent with the synergy trap hypothesis and extant empirical findings of value-reducing diversification strategies in recent literature. The evidence also indicates that a cross-border, rather than a domestic M&A deal, is the main driver of the negative market reaction. Further, our evidence of negative impacts on the bidder's business after an M&A reinforces our main finding that market participants, on average, perceive M&A activities to be detrimental to shareholder value. This suggests that value creation or synergy through an M&A deal is not warranted even though it can generate an increase in size of the firm.