• The KIPS Transactions:PartA
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• v.9A no.4
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• pp.603-614
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• 2002

Delivery efficiency of e-learning media can be influenced by authoring processes. Generally, a moving picture recorded by video camera can be delivered to student by multimedia streaming service, using media server technology. A e-learning media authored by lecture authoring tool is played in a student application by download-based delivery system. Recently, some animation know-how are applied to author e-learning media by hand-operation. In this paper, we suggest a client-based streaming service for the e-leaning media consists of media files and integration data The lecture of e-learning media nay be divided into some time-based small blocks. Each blocks can be located distributed site. The student system gather those blocks by download-scheduling. This is a valid method for QoS guarantee streaming services. In addition to our study, lecturers can author composite e-learning media includes media files and dynamic web pages simply, The distributed e-learning media files of our study is managed by multi-author and updated rapidly.

• The KIPS Transactions:PartB
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• v.15B no.6
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• pp.585-594
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• 2008

The issues that we should consider in the process of providing mobile web service using a mobile device are seamless service and QoS-guaranteed service. HMIPv6 has MAP because of improving packet loss and transmission delay due to disconnection. However, a load is concentrated on HMIPv6 because of receiving and delivering packet for MN. Owing to this, real time data fails to be processed quickly, and also adaptive mobile service is required for QoS guaranteed service. However, this method demands the response time cost of contents service owing to the hardware differences of various devices. Therefore, we improve the process performance of real time data by applying a queue in MAP for seamless service in this paper. For decreasing response time cost, we propose mobile web service method which has reusable cache of contents using the elements of contents. The result of a numerical formula and simulation shows that our proposed method is superior under various system conditions.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.34 no.9B
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• pp.900-907
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• 2009

With the introduction of the concept such as QoS, QoE, and MOS for the multimedia services over the high-speed network the user's concern about the degradation in the perceived quality of service for the conventional data service has become a new problem to the Internet service providers. In this work we propose a method to evaluate the subjective QoE such as MOS for the high-speed Internet service, where the round trip time for the data transfer is taken into account as a performance parameter for the experienced delay. We develop a tool to evaluate an MOS that enables us to investigate the behavior of users for diverse delay times for the web access service, via which we analyze the sensitivity of users with regard to MOS as a function of delay.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.5
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• pp.25-38
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• 2013

Future wireless systems will be required to support the increasingly nomadic lifestyle of people. This support will be provided through the use of multiple overlaid networks which have very different characteristics. Moreover, these networks will be required to support the seamless delivery of today's popular desktop services, such as web browsing, interactive multimedia and video conferencing to the mobile devices. Thus one of the major challenges in the design of these mobile systems will be the provision of the quality of service (QoS) guarantees that the applications demand under this diverse networking infrastructure. We believe that it is necessary to use resource reservation and adaptation techniques to deliver these QoS guarantee to applications. However, reservation and pre-configuration in the entire service region is overly aggressive, and results in schemes that are extremely inefficient and unreliable. To overcome this, the mobility pattern of a user can be exploited. If the movement of a user is known, the reservation and configuration procedure can be limited to the regions of the network a user is likely to visit. Our proposed Proxy-UMP is not sensitive to increase of the search cost than other schemes and shows that the increasing rate of total cost is low as the SMR increases.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.736-738
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• 2014

As part of real-time streaming service, which is one of the latest QoS technology has become the issue. But the current majority of streaming services are specific S/W I a separate setup program supports real-time streaming service a reality, will be stored until the end of the video, save for a video about editing and is not available. In this paper, a video about multi-threaded and distributed processing system applied to the Storm technique based on separate software or installation of programs without the H T M L 5-based Web content is produced by each device using a Web browser, real-time streaming system you want, no. This is a streaming service that provides users with real-time editing and the footage is stored as about and respond in real time between the server and the client and content sharing that need training and will be utilized in the field of multimedia streaming.

• Journal of the Korea Society of Computer and Information
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• v.10 no.6 s.38
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• pp.219-226
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• 2005

This paper describes the open API with integration of semantic web service with PARLAY X based open API in 4G mobile network. It can be expected that the intelligence such as the context-awareness, adaptation and personalization in 4G mobile network will be deployed. But the existing PARLAY based network lacks in considering context-awareness, adaptation and personalization. Therefore, the object of this paper is to support the architecture and the Application Programming Interface (API) of the network service for the context-awareness, adaptation and Personalization in 4G mobile network The open API is to provide users with the adaptive network service to the changing context constraints as well as detecting the changing context and user's Preference. For instance, the open API can Provide users with QoS in network according to the detected context and user's preference, after detecting the context such as location and speed and user's preference.

• Proceedings of the IEEK Conference
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• 2003.07a
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• pp.149-152
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• 2003

All-IP 망에서는 core 망 뿐만 아니라 무선망 모두 IP 공유패킷망 (shared packet network)으로 구성된다. 특히 유선망에 비해 대역폭이 제한적인 무선패킷망에서 사용자의 QoS 요구를 만족시키면서 성능을 최대화시키는 것은 매우 중요하다. 본 논문에서는 Web-browsing 과 같은 대화형 (interactive) 데이터 사용자를 위한 무선공유패킷망을 모델링하고 사용자 관점의 성능 분석 결과와 시뮬레이션 결과를 보인다.

• The Magazine of the IEIE
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• v.31 no.3
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• pp.88-97
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• 2004

최근 통계에 따르면 현재 셀룰러 이동 통신 사용자는 전 세계적으로 수십 억 명에 달하고 있으며, 증가량도 매년 7%에 이른다고 한다. 무선 이동통신은 단순히 편하다는 것 이상의 의미를 지니고 있다. 범지구적인 관점에서 살펴보면 보다 많은 사람들이 무선 기술을 이용하여 인터넷에 접속하려 하고 있다. 따라서 우리가 오늘날 World Wide Web - 스트리밍 서비스, 단문 메시지, 전자상거래, P2P- 을 이용하여 얻는 모든 이득들이 무선으로 확장되고 있는 상황이다.(중략)

• Proceedings of the Korean Information Science Society Conference
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• 2010.06d
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• pp.380-383
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• 2010

본 논문은 원격에서의 의료 기술이나, 대용량을 요구하는 실시간 협업 등에서 사용자의 요구에 따라 빠르게 요구 대역폭을 할당하고 보장하기 위한 Dynamic Circuit Network 구현 방법을 기술 하였다. 이를 위해 QoS, MPLS, RSVP 기술을 기반으로 2계층의 LSP을 동적으로 할당할 수 있도록 하였으며, 사용자는 이를 웹 기반의 인터페이스(web-based user interface)를 통해 쉽게 서비스 받을 수 있도록 하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10c
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• pp.253-255
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• 2001

본 논문은 급속한 인터넷의 성장에 따라 사용자의 서비스 질을 보장하기 위한 Q-PID라는 제어기를 새롭게 제안한다. 이러한 제어기는 사용자 요청에 대한 응답시간을 보장하기 위하여 모든 웹 요청에 대해서 입장 허용 가능한지를 조사하고 이게 근거하여 입장 허용된 요청은 서버 지연 응답시간을 보장해 줄 수 있도록 한다. 이러한 Q-PID 제어기를 사용함으로서 복잡한 사용자의 요구를 충족시킬 수 있다. 이러한 Q-PID를 설계하고 구현하였으며 실험결과와 함께 제어성에 대해서 토의하였다.