• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.11
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• pp.2553-2562
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• 2013

It is difficult for TCP congestion control algorithm to ensure the bandwidth and delay bound required for media streaming services in broadband wireless network environments. In this paper, we propose the COIN TCP (COncave INcrease TCP) scheme for providing a high-quality media streaming services. The COIN TCP concavely increases the congestion window size by adjusting the increment rate of congestion window, that is inversely proportional to the amount of data accumulated in the router queue. As a result, our scheme can quickly occupy the available bandwidth and prevent the heavy congestion. It also improves the link utilization by adjusting the decrement rate of congestion window according to the packet loss rate with the random loss. Through the simulation results, we prove that our scheme improves the total throughput in broadband wireless network.

• Journal of the Institute of Electronics and Information Engineers
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• v.52 no.9
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• pp.135-140
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• 2015

Web-services employ XML that is the well-formed structure as a de-facto standard to represent data. SOAP or REST is one of the representative web-services using XML based massage passing systems. The XML parser can be divided into event driven and DOM tree. A streaming parser as an event driven is widely used for high-speed parsing. Since the streaming parser processes XML documents in sequence, they have any limitation to improve system performance. In order to improve speed of streaming XML parser, we present multibyte based streaming XML hardware parser using the element analyzer instead of the state machine. Compared to other parsers, the proposed MStreXHP can achieve about 2.72 times improvement in the number of clock cycles to be consumed in comparison of characters and sustain about 7.8Gbps throughput. Therefore, our MStreXHP is desirable for the streaming XML hardware parser on high-performance systems.

• Journal of the Korea Society of Computer and Information
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• v.15 no.3
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• pp.81-89
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• 2010

The research on peer-to-peer streaming schemes has largely focused on tree-push and mesh-pull structures. However, the tree-push structure has a defect that the tree restructuring time is long, and the mesh-pull structure has long startup delay and lag time from source servers. In this paper, we propose a new peer-to-peer live streaming scheme based on a push-mesh structure that takes advantages of tree-push and mesh-pull structure simultaneously. This structure basically provides the mesh-pull mechanism for data transmission and utilizes peers with high network upload capacity. It also supports the push mechanism along with paths from a source server, super peers, and selected general peers. By NS-2 simulation experiments, we finally show that our proposed scheme can achieve shorter startup delay than the mesh-pull structure, similar lag time to tree-push structure and best playback continuity among the three schemes.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.8
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• pp.1851-1856
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• 2013

An XML is widely used for web services, such as SOAP(Simple Object Access Protocol) and REST (Representational State Transfer), and also de facto standard for representing data. Since the XML parser using DOM(Document Object Model) requires a preprocessing task creating a DOM-tree, and then storing it into memory, embedded systems with limited resources typically employ a streaming XML parser without preprocessing. In this paper, we propose a new architecture for the streaming XML parser using an APSearch(Adaptive Parallel Search) on FPGA(Field Programmable Gate Array). Compared to other approaches, the proposed APSearch parser dramatically reduces overhead on the software side and achieves about 2.55 and 2.96 times improvement in the time needed for an XML parsing. Therefore, our APSearch parser is suitable for systems to speed up XML parsing.

• Journal of Broadcast Engineering
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• v.24 no.6
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• pp.1053-1063
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• 2019

Recently, tile-based streaming that transmits one 360 video in several tiles, is actively being studied in order to transmit these 360 video more efficiently. In this paper, for the transmission of high-definition 360 video corresponding to user's viewport in tile-based streaming scenarios, a system of assigning the quality of tiles at each tile by applying the saliency map generated by existing network models is proposed. As a result of usage of Motion-Constrained Tile Set (MCTS) technique to encode each tile independently, the user's viewport was rendered and tested based on Salient360! dataset, streaming 360 video based on the proposed system results in gain to 23% of the user's viewport compared to using the existing high-efficiency video coding (HEVC).

• Journal of the Korea Society of Computer and Information
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• v.29 no.6
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• pp.211-221
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• 2024

Live streaming commerce has emerged as an innovative e-commerce model. This study, based on the Elaboration Likelihood Model (ELM), aims to explore the impact of Key Opinion Consumers' (KOCs) attributes in live streaming commerce on purchase intentions on short video platforms. A survey was conducted with 411 consumers, and data analysis and hypothesis testing were performed using SPSS 24.0 and AMOS 23.0 software. Research has found that differences in consumers' information processing abilities lead to different pathway selections. Central route factors such as recommendation consistency, product involvement, and professionalism, as well as peripheral route factors such as recommendation timeliness, all have significant positive effects on consumers' purchase intention. However, visual cues in the peripheral route do not have a significant impact. This study aims to provide theoretical support and practical guidance for the development of the live streaming commerce industry, and to help companies adjust their promotion strategies based on differences in consumer information processing, thereby improving purchase conversion rates.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.655-657
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• 2005

지속적인 네트워크 환경의 개선과 기술의 비약적인 발전으로 인해 인터넷을 이용한 여러 가지 서비스가 등장하게 되었고, AOD, VOD 등과 같은 멀티미디어 데이터를 제공하는 스트리밍 서비스가 두각을 보이기 시작했다. 본 논문에서는 네트워크 상황에 따라 QoS를 향상시키기 위한 MPEG 비디오 스트림의 혼합 스케일링 방식을 이용한 신뢰성을 보장할 수 있는 TCP 전송 방식을 제안하여, 스케일러블 전송이 가능하면서 고화질의 영상을 서비스할 수 있도록 한다.

• Proceedings of the KAIS Fall Conference
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• 2010.11a
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• pp.443-446
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• 2010

최근 들어 데이터, 음성 위주의 통신 산업과 영상중심의 방송 산업이 빠르게 융합되고 있다. 따라서 본 논문에서는 IP 기반의 멀티미디어 스트리밍 전송이 가능하도록 네트워크 대역폭의 사용을 최소화하여 특정 채널에 대한 멀티미디어 서비스뿐만 아니라 여러 채널을 동시에 사용자가 서비스 받을 수 있도록 멀티 접근 방법을 제안하고자 한다. 또한 네트워크의 지연을 흡수 할 수 있는 버퍼링 기법, 안정적인 채널 대역폭 할당 및 유지를 위한 객체 모델을 설계 하고자 한다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10c
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• pp.313-315
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• 2003

멀티캐스트 기술은 인터넷 서비스에 필수불가결한 요소임에도 불구하고, 네트워크상의 구현에 어려움으로 인해 그 기술이 활용되지 못하고 있다. 멀티캐스트 기술의 장점을 활용하기 위하여 어플리케이션 레벨에서 멀티캐스트 기능을 구현한 응용 멀티캐스트 프로토콜들이 제안되고 있다[1,2]. 본 논문에서는 이기종 환경에서 다수의 송신자가 상이한 전송률을 갖는 수신자들에게 다양한 대역폭을 제공하고 보다 효과적인 실시간 스트리밍 전송 서비스를 지원하기 위한 멀티캐스트 기법을 제안한다. 본 연구에서 제안하는 멀티캐스트 기법의 통시구조는 소스기반의 전송트리가 내포되어 있는 n차 정다면체 구조를 갖으며, 서로 비슷한 전송률을 갖는 수신자들끼리 서브 그룹을 구성하므로 실시간 데이터 전송시 주어진 대역폭을 효과적으로 사용할 수 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06d
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• pp.94-96
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• 2012

최근 스마트폰과 같은 모바일 단말들의 확산 및 인터넷을 이용한 애플리케이션의 증가와 함께 데이터 트래픽 또한 급속도로 증가하고 있다. 이로 인하여 이동통신사들이 제공하는 통신 장비들에서 과부하가 발생하고 있으며, 모바일 단말들의 연결이 자주 끊어지는 등 QoS 측면에서 심각한 문제가 발생하고 있다. 본 논문에서는 모바일 단말들의 연결 상태 정보를 활용하여 최적화된 P2P 페어링을 제공함으로써 콘텐츠 스트리밍 서버의 트래픽을 감소시킬 수 있는 기법을 제시한다. 또한 기존에 고려되지 않았던 모바일 단말의 이동성, 다양한 네트워크 통신 방법 및 QoS를 고려함으로써 모바일 환경에서 기존 방식보다 멀티미디어 서비스 품질을 개선 할 수 있는 연결인지형(Connectivity-aware) P2P 미들웨어를 설계한다.