• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권1호
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• pp.406-425
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• 2012

Deploying advanced home networking technologies and modern home-networked devices in residential environments provides a playground for new home applications and services. Because home multimedia entertainment is among the most essential home applications, this paper presents an appealing home media content sharing scenario: home-networked devices can discover neighboring devices and share local media content, as well as enormous amounts of Internet media content in a convenient and networked manner. This ideal scenario differs from traditional usages that merely offer local media content and require tedious manual operations of connection setup and file transfer among various devices. To achieve this goal, this study proposes a proxy gateway architecture for home multimedia content distribution. The proposed architecture integrates several functional mechanisms, including UPnP-based device discovery, home gateway, Internet media provision, and in-home media content delivery. This design addresses several inherent limitations of device heterogeneity and network interoperability on home and public networks, and allows diverse home-networked devices to play media content in an identical and networked manner. Prototypical implementation of the proposed proxy gateway architecture develops a proof-of-concept software, integrating a BitTorrent peer-to-peer client, a UPnP protocol stack, and a UPnP AV media server, as well as media distribution and management components on the OSGi home gateway platform. Practical demonstration shows the proposed design and scenario realization, offering users an unlimited volume of media content for home multimedia entertainment.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 하계종합학술대회논문집
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• pp.38-41
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• 1998

Due to the increasing demand to multimedia services over wireless communication network, LMDS(Local Multipoint Distribution Service) has been proposed as an alternate approach for broadband wireless access network. But LMDS, Which uses the mmwavelength radio spectrum, has been limited for unknown microwave frequency characteristics. In this paper, we analyze the parameters related to the system design on 28GHz frequency: Propagation path loss and rainfall attenuation. Based on these analytical results, the proper cell size in Korea is determined. We also analyze the bit error rate and frame loss rate for various kinds of digital modulation schemes(QAM 4, 16, 64, 256). Finally, we apply to ㅍ service to evaluate a call blocking rate, efficiency and channel capacity.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 ITC-CSCC -1
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• pp.322-325
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• 2000

In a batch scheduling policy being different from real video system, the requests are not served immediately due to grouping user's requests upon every scheduling points. Such waiting delays by inefficient managements makes an unfair service to users and increases the possibility of higher reneging rates. This paper proposes an adaptive batch scheduling scheme which reduces the average waiting time of user’s requests and reduces the starvation problem for requesters of less popular movies. The proposed scheme selects dynamically multiple videos in given intervals based on the service patterns which reflect the popularity distribution and resource utilizations. Experimental simulation shows that proposed scheme improves about 20-30 percent of average waiting time and reduces significantly the starving requesters comparing with those of conventional methods such as FCFS and MQL.

• 전기학회논문지
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• 제66권3호
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• pp.575-580
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• 2017

In these days, the big-size and high resolution multimedia file is widely used through networks. To transfer and service effectively, the internet network technology is necessary to substitute broadcasting. Normally Content Delivery Network(CDN) is widely used in conventional internet for multimedia services. But it has a small bandwidth to service. So to solve this problems, many researchers have suggest the protocol for download, content distribution/saving, server synchronization, caching, pushing rate, and streaming etc. But all of these has some defects like low resolution, packets loss and delay, real application implementations etc. So, this paper suggests a new method of network protocol based on P2P collaboration and user's content using information. And it evaluated the performance of suggested method. As the results, it showed the effectiveness of 4 performances indices : download speed, decreasing rate of connected user in same time, adaptive hit ratio, traffic decreasing rate.

• 한국정보처리학회논문지
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• 제4권12호
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• pp.3097-3110
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• 1997

초고속 통신망의 구축과 컴퓨터 기술의 발전으로, 컴퓨터 기술과 통신망이 통합된 정보통신 인프라 (Infra-structure)를 객체 지향 소프트웨어 구조의 시스템으로 모델화한 개방형 정보 통신망 구조위에서 멀티미디어 서비스를 제공하는 연구 활동이 활발히 전개되고 있다. 본 논문에서는 멀티미디어 서비스의 기본이 되는 화상 회의 서비스를 선정하여, 개방형 정보 통신망 구조에서 서비스 세션 관리 기능을 객체 모델링 하였다. 또한 화상 회의 서비스를 통하여 서비스 세션 객체와 물리적 통신망을 제어하는 연결 관리 객체간 접속을 세션 그래프와 연결 그래프로 개념화 하였으며, 이들 간의 세션 관리 객체 모델링과 매핑 및 객체 정보 공유에 대한 기술을 검증하였다.

• 전자공학회논문지CI
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• 제46권2호
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• pp.52-57
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• 2009

최근 T-DMB의 정식 서비스는 수신기의 급속한 보급을 만들었다. T-DMB의 보급으로 T-DMB 콘텐츠의 불법 배포에 대한 문제는 커지고 있다. 본 논문에서는 T-DMB 콘텐츠의 불법 배포 방지를 위한 복사 및 재생 제어 정보를 암호화하여 T-DMB 비트스트림에 워터마킹 하는 방법을 제안하고 T-DMB 수신기를 내장한 PMP(portable multimedia player)에 이를 구현한다. 제안한 방법은 전송 스트림을 분석하여 PMT(Program Map Table) 및 PAT(Program Association Table)의 패딩 데이터 부분을 찾아 암호화된 복사 및 재생제어 정보를 워터마킹한다. 구현 결과 복사 및 재생제어 정보에 따라 콘텐츠의 사용이 제어됨을 볼 수 있었다. 제안한 방법은 이동형 T-DMB 단말기에서 T-DMB 콘텐츠의 불법 배포를 막을 수 있는 콘텐츠 보호용 소프트웨어로 활용될 수 있을 것이다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -3
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• pp.2075-2078
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• 2002

Internet became the most popular network in spite of its weakness in realtime multimedia service. Many experts believe that the Internet has the potential to become the main multimedia distribution network of the near future. Currently, it does not provide any (BoS guarantees and, even when it does, guaranteed quality delivery of video may turn out to be too expensive. Unavoidable packet losses and delay jitter caused by congestion in a best effort delivery environment require use of intelligent transport techniques for effective video delivery. According to market needs of better quality of service (QoS) fur realtime multimedia services over Internet, they have been standardizing RSVP, IntServ, and DiffServ This paper combines the benefits of QoS mechanisms such as RSVP/IntServ with scalable video encoding. We propose that more important bit stream is given more priority such that limited network resources are guaranteed far the stream. Various prioritizing approaches are proposed and compared to normal approach by using Network Simulator. The calculated QoS parameters such as packet loss rate are used to calculate degree of degradation in video quality. In this Paper, proposed methods can be implemented adaptively to Von protocol, such as H.323, SIP.

• 디지털융복합연구
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• 제12권10호
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• pp.253-258
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• 2014

최근 스마트폰 사용이 증가하면서 빅 데이터 서비스를 제공하는 클라우드 컴퓨팅 기술이 발달하고 있으며, 빅 데이터 서비스를 제공받으려는 사용자 또한 증가하고 있다. 빅 데이터 서비스 중 하둡 프레임워크는 데이터 집약적인 분산 어플리케이션을 지원하는 하둡 파일 시스템과 하둡 맵리듀스로 서비스를 제공하고 있으나, 하둡 시스템을 이용하는 스마트폰 서비스는 데이터 인증시 보안에 매우 취약한 상태이다. 본 논문에서는 스마트폰 서비스를 제공하는 하둡 시스템의 초기 과정의 인증 프로토콜을 제안한다. 제안 프로토콜은 하둡 시스템의 안전한 다중 데이터 처리를 지원하기 위해서 대칭키 암호 기술과 함께 ECC 기반의 알고리즘을 조합하였다. 특히, 제안 프로토콜은 사용자가 하둡 시스템에 접근하여 데이터를 처리할 때, 초기 인증키를 대칭키 대신 타원 곡선 기반의 공개키를 사용함으로써 안전성을 향상시켰다.

• 산업공학
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• 제17권1호
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• pp.121-127
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• 2004

In this paper, we present the base station(BS) processing capacity to provide the multimedia services in IMT-2000 wireless communication network. The IMT-2000 services are classified into two types, circuit and packet services, and user‘s environments such as indoor, pedestrian and vehicle are considered. Using the parameters of service economics and wireless technology, the user's reference traffic and BS‘s traffic are computed. The traffic is measured by throughput(kbps). Based on the measured traffic, the accommodating users in BS are also evaluated. In addition to, the BS design capacity is presented for varying the number of users and traffic distribution in different user's environments.

• 한국멀티미디어학회논문지
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• 제23권2호
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• pp.328-342
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• 2020

As the cloud-based ICT(Information & Communication Technology) infrastructure matures, the existing monolithic software development method is evolving into a micro-service structure based on cloud native computing. To develop and operate the services efficiently under the cloud native environment, DevOps-based application development plans through MSA(Micro Service Architecture) design based are essential. A cloud native environment is an approach to developing and running applications that take advantage of cloud computing models such as automation of source distribution, container-based virtualization, application scalability, resource efficiency, and flexible maintenance through object independence. To implement this approach, the utilization of key elements such as DevOps, continuous delivery, micro service, and containers is essential, but there are not enough previous studies on case analyses or application methods of these key elements. Therefore, in this paper, we analyze the cases of application development in cloud native environment and propose the optimized application development process and development method through small and medium-sized SI projects.