• Title/Summary/Keyword: Hybrid Video-on-demand

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Hybrid Multicast and Segment-Based Caching for VoD Services in LTE Networks

  • Choi, Kwangjin;Choi, Seong Gon;Choi, Jun Kyun
    • ETRI Journal
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    • v.37 no.4
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    • pp.685-695
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    • 2015
  • This paper proposes a novel video delivery scheme that reduces the bandwidth consumption cost from a video server to terminals in Long-Term Evolution networks. This proposed scheme combines optimized hybrid multicast with a segment-based caching strategy for use in environments where the maximum number of multicast channels is limited. The optimized hybrid multicast, allocation of multicast channels, and cache allocation are determined on the basis of a video's request rate, the related video's length, and the variable cost per unit size of a segment belonging to the related video. Performance evaluation results show that the proposed scheme reduces a video's delivery costs. This work is applicable to on-demand TV services that feature asynchronous video content requests.

Hybrid Video on Demand Using Dynamic Channel Allocation (동적인 채널할당을 이용한 결합형 주문형 비디오 서비스)

  • Lee Suk Won;Park Sung-Kwon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.1A
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    • pp.91-103
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    • 2005
  • In designing a video-on-demand (VoD) system, the major challenge may be how to reduce the channels concurrently used maintaining the client's waiting time. For this reason, the various architectures which integrate the multicast streams with the unicast streams were suggested in order to improve channel efficiency in recent years. In combining multicast with unicast, the ways to group the unicast channels together are important so that clients can share the multicast transmission channels. This paper proposes a hybrid video-on-demand system which gathers the unicast channels in new ways and shares multicast transmission channels efficiently by using dynamic channel allocation architecture. The numerical results demonstrate that the proposed architecture in some case achieves performance gain of $551{\%}$ compared to existing architecture. This paper presents procedure of channel release and reuse, performance analysis, and simulation results of the dynamic channel allocation architecture.

Study on the Photoelectric Composite Cable for Hybrid Interconnection Implementation (Hybrid 인터커넥션 구현을 위한 광전 복합케이블 제작에 관한 연구)

  • Kim, Jae-Yeol;You, Kwan-Jong;Park, Ryeok
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.16 no.3
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    • pp.138-145
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    • 2017
  • With the increasing use of smart electronic devices, the size of the related I/O interface market is increasing rapidly. Demand is also growing for the continuous increase of data and video signals-such as faster data processing speed and data storage capacity-in the smart electronic device input/output interface market. Currently, the POF hybrid cable used in the smart electronic device input / output interface market cannot transmit over a long distance because the optical loss is too large, and the GOF hybrid cable is both vulnerable to bending and other sudden outside changes, and expensive. Therefore, in this study, the design and fabrication of a GOF hybrid cable and fiber guide were carried out in order to develop a cable which can easily withstand external impact, has low optical losses, and meets the demand for continuous data and video signal increase in the smart electronic device input / output interface market.

Hybrid Video-on-Demand Service Using Dynamic Client Buffer (Dynamic Client Buffer를 이용한 결합형 Video-on-Demand 서비스)

  • Joe, Seong-Min;Kim, Yong-Hoon;Kim, Tae-Soo;Park, Sung-Kwon
    • 한국IT서비스학회:학술대회논문집
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    • 2006.11a
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    • pp.360-365
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    • 2006
  • VoD (Video-on-Demand) 서비스는 가입자가 원하는 컨텐츠를 실시간으로 전송하는 서비스의 형태이다. 오늘날은 방대한 양의 멀티미디어 데이터를 효율적으로 압축하고 보다 빠르게 전송할 수 있는 시스템의 발달이 가속화되고 있고 이는 VoD 서비스의 증가로도 이어지고 있다. 그러므로 가입자가 원하는 컨텐츠를 보다 효과적으로 제공할 수 있는 VoD 서비스의 방법을 찾는 것은 중요한 일이다. 본 논문에서는 기존의 NVoD (Near-VoD) 서비스 또는 TVoD (True-VoD) 서비스 만을 제공함으로서 생길 수 있는 단점을 없애고 장점만 살릴 수 있는 방법을 제안하였다. 이는 기존의 가입자단에 Buffer를 제공하여 NVoD를 TVoD화 함으로서 가능하게 하였다. 또한, 본 논문에서 제안한 방법이 필요한 버퍼의 크기를 제시하고 전체적인 알고리즘을 제시하여 이를 구체화 하였다.

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Design and Evaluation of a Reservation-Based Hybrid Disk Bandwidth Reduction Policy for Video Servers (비디오 서버를 위한 예약기반 하이브리드 디스크 대역폭 절감 정책의 설계 및 평가)

  • Oh, Sun-Jin;Lee, Kyung-Sook;Bae, Ihn-Han
    • The KIPS Transactions:PartB
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    • v.8B no.5
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    • pp.523-532
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    • 2001
  • A Critical issue in the performance of a video-on-demand system is the required I/O bandwidth of the Video server in order to satisfy clients requests, and it is the crucial resource that may cause delay increasingly. Several approaches such as batching and piggybacking are used to reduce the I/O demand on the video server through sharing. Bathing approach is to make single I/O request for storage server by grouping the requests for the same object. Piggybacking is th policy for altering display rates of requests in progress for the same object to merge their corresponding I/O streams into a single stream, and serve it as a group of merged requests. In this paper, we propose a reservation-based hybrid disk bandwidth reduction policy that dynamically reserves the I/O stream capacity of a video server for popular videos according to the loads of video server in order to schedule the requests for popular videos immediately. The performance of the proposed policy is evaluated through simulations, and is compared with that of bathing and piggybacking. As a result, we know that the reservation-based hybrid disk bandwidth reduction policy provides better probability of service, average waithing time and percentage of saving in frames than batching and piggybacking policy.

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An Optimized e-Lecture Video Search and Indexing framework

  • Medida, Lakshmi Haritha;Ramani, Kasarapu
    • International Journal of Computer Science & Network Security
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    • v.21 no.8
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    • pp.87-96
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    • 2021
  • The demand for e-learning through video lectures is rapidly increasing due to its diverse advantages over the traditional learning methods. This led to massive volumes of web-based lecture videos. Indexing and retrieval of a lecture video or a lecture video topic has thus proved to be an exceptionally challenging problem. Many techniques listed by literature were either visual or audio based, but not both. Since the effects of both the visual and audio components are equally important for the content-based indexing and retrieval, the current work is focused on both these components. A framework for automatic topic-based indexing and search depending on the innate content of the lecture videos is presented. The text from the slides is extracted using the proposed Merged Bounding Box (MBB) text detector. The audio component text extraction is done using Google Speech Recognition (GSR) technology. This hybrid approach generates the indexing keywords from the merged transcripts of both the video and audio component extractors. The search within the indexed documents is optimized based on the Naïve Bayes (NB) Classification and K-Means Clustering models. This optimized search retrieves results by searching only the relevant document cluster in the predefined categories and not the whole lecture video corpus. The work is carried out on the dataset generated by assigning categories to the lecture video transcripts gathered from e-learning portals. The performance of search is assessed based on the accuracy and time taken. Further the improved accuracy of the proposed indexing technique is compared with the accepted chain indexing technique.

Near Video on Demand system using Staggered-Staircase Scheme for Low User Buffer (Staggered - Staircase 방식을 이용한 유사 주문형 비디오 전송 방식)

  • Kim, Tae-Soo;Kim, Yong-Hoon;Joe, Seong-Min;Park, Sung-Kwon
    • 한국IT서비스학회:학술대회논문집
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    • 2006.11a
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    • pp.352-359
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    • 2006
  • VoD 전송 방식을 설계할 때 가장 중요한 요소들에는 정해진 대역폭에서 사용자 대기시간 (Viewer's Waiting Time)과 클라이언트에서 요구하는 최대 버퍼 요구량(Max Client Buffer Requirement)을 줄이는 문제를 꼽을 수 있다. 점점 더 복잡해지는 VoD 전송 기술의 개발로 인해 사용자 대기시간과 최대 버퍼 요구량의 관점에서 성능 향상과 반비례하는 시스템 복잡도를 줄이는 문제 또한 VoD 전송 방식을 설계 시 고려 해야 할 중요 사항 중의 하나이다. 이 논문에서는 시스템 복잡도를 낮추면서 사용자 대기시간과 최대 버퍼 요구량의 성능을 동시에 향상시키기 위한 방법으로 기존의 VoD 전송 방식들 가운데 가장 간단한 모델과 최대 버퍼 요구량의 성능을 가장 향상시킨 모델의 결합으로 구현 가능한 Hybrid 방식을 제안하고 있다. 이 논문은 결과적으로 사용자 대기시간은 기존 Staircase Broadcasting방식과 Fast Broadcasting 방식과 비교했을 때 동일한 성능을 나타내고 있고 최대 버퍼 요구량은 유사성능을 나타냄을 알 수 있다. 이 논문에서 제안한 방식은 사용자 대기시간이 짧아야 하고 저장공간이 많이 요구되지 않으며 사용자의 요청이 갑자기 증가될 수 있는 hot 비디오에 적용이 가능하다. 또한 다양한 환경에 따라 Staggered Broadcasting 방식과 Staircase Broadcasting 방식의 채널 수를 적절히 조정함으로써 데이터 송수신 효율을 극대화 시킬 수 있다. 이 논문의 구성은 제시한 방법에 적용된 방식들과 비교대상이 되는 방식들에 대해 살펴보고 제시한 방식의 성능 모델을 이용한 실험을 통해 각종 VoD 전송 방식들과 비교 분석하는 과정으로 기술하였다.

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A Study on Real-time Streaming System Using the Dual-Streaming Technique (듀얼 스트리밍 기법을 활용한 실시간 스트리밍 시스템)

  • Ban, Tae-Hak;Kim, Eung-Yeol;Yang, Xitong;Kim, Ho-Sung;Jung, Hoe-Kyung
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2015.10a
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    • pp.791-793
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    • 2015
  • Recently, UCC (User Created Contents) and VoD (Video on Demand), and multimedia content are growing, IP-TV, Smart TV, OHTV (Open Hybrid TV) various services such as multi platform (Multi-platform) environment, services and QoS issues. To solve this problem, the network efficiently, and improve the quality of content is necessary for the system. In this paper, the network of channels State and transmission of multimedia data based on dynamic resource usage, TCP and UDP, Adaptive dual-streaming system used for design and analysis. In addition, the existing TCP and UDP streaming system using a single protocol for analysis and verification of the effectiveness of the difference between and. This is a disaster, and medical/first aid system will be utilized in the field of feed, are ubiquitous.

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An Adaptive Fast Expansion, Loading Statistics with Dynamic Swapping Algorithm to Support Real Time Services over CATV Networks

  • Lo Chih-Chen, g;Lai Hung-Chang;Chen, Wen-Shyen E.
    • Journal of Communications and Networks
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    • v.8 no.4
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    • pp.432-441
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    • 2006
  • As the community antenna television (CATV) networks becomes ubiquitous, instead of constructing an entirely new broadband network infrastructure, it has emerged as one of the rapid and economic technologies to interconnecting heterogeneous network to provide broadband access to subscribers. How to support ubiquitous real-time multimedia applications, especially in a heavy traffic environment, becomes a critical issue in modern CATV networks. In this paper, we propose a time guaranteed and efficient upstream minislots allocation algorithm for supporting quality-of-service (QoS) traffic over data over cable service interface specification (DOCSIS) CATV networks to fulfill the needs of realtime interactive services, such as video telephony, video on demand (VOD), distance learning, and so on. The proposed adaptive fast expansion algorithm and the loading statistics with dynamic swapping algorithm have been shown to perform better than that of the multimedia cable network system (MCNS) DOCSIS.

Packet Scheduling in Interactive Satellite Return Channels for Mobile Multimedia Services Using Hybrid CDMA/TDMA

  • Lee Ki-Dong;Kim Ho-Kyom;Lee Ho-Jin
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2003.05a
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    • pp.744-748
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    • 2003
  • Developing an interactive satellite multi­media system, such as a digital video broadcasting (DVB) return channel via satellite (RCS) system, is gaining popularity over the world To accommodate the increasing traffic demand we are motivated to investigate an alternative for improving return channel utilization We develop an efficient method for optimal packet scheduling in an interactive satellite multimedia system using hybrid CDMA/TDMA channels. We formulate the timeslot-code assignment problem as a binary integer programming (BIP) problem, where the throughput maximization is the objective, and decompose this BIP problem into two sub-problems for the purpose of solution efficiency. With this decomposition, we promote the computational efficiency in finding the optimal solution of the original BIP problem Since 2001, ETRI has been involved in a development project where we have successfully completed an initial system integration test on broadband mobile Internet access via Ku-band channels using the proposed resource allocation algorithm.

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