• International Journal of Internet, Broadcasting and Communication
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• 제7권1호
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• pp.30-35
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• 2015

The most important factor within the wireless sensor network is to have effective network usage and increase the lifetime of the individual nodes in order to operate the wireless network more efficiently. Therefore, many routing protocols have been developed. The LEACH protocol presented by Wendi Hein Zelman, especially well known as a simple and efficient clustering based routing protocol. However, because LEACH protocol in an irregular network is the total data throughput efficiency dropped, the stability of the cluster is declined. Therefore, to increase the stability of the cluster head, in this paper, it proposes a stochastic cluster head selection method for improving the LEACH protocol. To this end, it proposes a SH-LEACH (Stochastic Cluster Head Selection Method-LEACH) that it is combined to the HEED and LEACH protocol and the proposed algorithm is verified through the simulation.

• 전자공학회논문지S
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• 제35S권8호
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• pp.21-31
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• 1998

본 논문에서는 복사 네트워크의 멀티캐스트 셀을 적절하게 분배할 수 있는 새로운 분배 알고리즘을 제안한다. 합산기, 분배기, 가상 주소 부호기, 방송 네트워크가 이원적으로 구성된 복사 네트워크는 제안된 분배 알고리즘에 의하여 낮은 번지와 높은 번지가 양분되어 동시에 동작하기 때문에 입력된 셀이 균등하게 처리되어 셀 지연율과 입력 공정성이 개선되고 복잡도가 감소된다. 또한 방송 네트워크로 이진 트리와 Banyan 네트워크로 구성된 확장 Banyan 네트워크를 사용하여 오버플로우 발생 확률을 1/2로 감소 시킨다. 분석 결과 제안된 알고리즘은 입력 버퍼에서 셀 지연율이 확연하게 감소됨을 알 수 있었다.

• 정보처리학회논문지A
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• 제15A권2호
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• pp.95-100
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• 2008

본 논문에서는 Folded 하이퍼-스타 연결망을 기반으로 하는 새로운 상호연결망, 계층적 Folded 하이퍼-스타 연결망 HFH($C_n,\;C_n$)을 제안한다. 그리고 본 논문에서 제안한 HFH($C_n,\;C_n$)가 Folded 하이퍼-스타 연결망과 기존에 제안된 계층적 연결망인 HCN(m,m), HFN(m,m)보다 망비용(지름${\times}$분지수) 측면에서 우수한 연결망임을 보인다. 또한 HFH($C_n,\;C_n$)의 여러 가지 망 성질(연결도, 라우팅 알고리즘, 지름, 방송)을 분석한다.

• 한국인터넷방송통신학회논문지
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• 제19권3호
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• pp.41-51
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• 2019

본 연구는 미국에서 제작되고 있는 엔터테인먼트 장르의 OTT(Over The Top) WWE Network의 구조와 콘텐츠를 탐구한다. 오늘 날 전 세계의 많은 회사들은 인터넷 스트리밍 서비스를 OTT를 제공하고 있으며, 가장 대표적인 예로는 Netflix가 있다. 본 연구에서는 WWE(World Wrestling Entertainment)의 WWE Network를 집중적으로 조사한다. WWE Network는 스포츠와 엔터테인먼트를 결합한 프로레슬링을 기반으로 하는 특징이 있으며, 범위가 지나치게 광범위하지 않기 때문에 연구에 적합하다고 판단된다. 이를 통해, WWE Network의 구조와 콘텐츠 를 연구할 뿐만 아니라, 전반적인 OTT 시장에 대해서도 탐구한다.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2009년도 정보통신설비 학술대회
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• pp.309-313
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• 2009

In this paper, the network performance of a turbo coded optical code division multiple access (CDMA) system with cross-layer, which is between physical and network layers, concept is analyzed and simulated. We consider physical and MAC layers in a cross-layer concept. An intensity-modulated/direct-detection (IM/DD) optical system employing pulse position modulation (PPM) for satellite broadcasting communications is considered. In order to increase the system performance, turbo codes composed of parallel concatenated convolutional codes (PCCCs) is utilized. The network performance is evaluated in terms of bit error probability (BEP). From the simulation results, it is demonstrated that turbo coding offers considerable coding gain with reasonable encoding and decoding complexity. Also, it is confirmed that the performance of such an optical CDMA network can be substantially improved by increasing the interleaver length and the number of iterations in the decoding process. The results of this paper can be applied to implement the satellite broadcasting communications.

• 정보처리학회논문지A
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• 제11A권5호
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• pp.341-346
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• 2004

최근에 병렬처리를 위한 새로운 위상으로 하이퍼-스타 그래프 HS(m, k)가 제안되었다. 하이퍼-스타 그래프는 하이퍼큐브와 스타 그래프의 성질을 가지고 있으면서, 같은 노드수를 갖는 하이퍼큐브 보다 망비용이 우수한 그래프이다 본 논문에서는 하이퍼-스타 그래프 HS(m, k)가 하이퍼큐브의 서브그래프임을 증명한다. 그리고 정규형 그래프인 하이퍼-스타 HS(2n, n)가 제안된 매핑 기법에 의해 노드 대칭임을 보이며, 최소 높이를 갖는 스패닝 트리를 이용한 일-대-다 방송 기법을 제안하고, 방송 수행 시간이 2n-1임을 보인다.

• 한국멀티미디어학회논문지
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• 제8권12호
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• pp.1613-1622
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• 2005

Broadcasting is fundamental and effective data dissemination mechanism for route discovery, address resolution, and many other network services in mobile ad hoc networks. Although many approaches for broadcasting have been proposed to minimize the number of retransmissions, none of them guarantee the best-suited bounds of retransmissions. Appropriate use of probabilistic method can lower the chance of contention and collision among neighboring nodes, so that it reduces the number of rebroadcasts. In this paper, we propose a probabilistic approach that dynamically adjusts the rebroadcasting probability according to the distance between the sender and the receiver. While the rebroadcast probabilities of a mobile node close to sender will be set lower, the rebroadcast probabilities of a mobile node far away from sender wi1l be set to higher, The rebroadcast probability of a node wi1l be set according to the distance from sender. We evaluate the performance of proposed approach by comparing it with flooding as well as a fixed probabilistic broadcast approach. Simulation results showed that the performance of proposed scheme outperforms by about $70\%$ than flooding scheme and outperforms by about $20\%$ than fixed probabilistic scheme.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.475-478
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• 1998

The matrix hypercube MH(2,n) is the interconnection network which improves the network cost of the hypercube. In this paper, we propose an algorithm for one-to-all broadcasting in the matrix hypercube MH(2,n). The algorithm can broadcast a message to 22n nodes in O(n) time. The algorithm uses the rich structure of the matrix hypercubes and works by recursively partitioning the original matrix hypercubes into smaller matrix hypercubes.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 신호처리소사이어티 추계학술대회 논문집
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• pp.509-512
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• 2003

On-going convergence between broadcasting and communication is currently bringing in lots of drastic changes to multimedia services to the home. The FTTH-based home networks will be the interface among the digital home appliances for broadcast digital contents as weil as for broadband data connection. In this paper, we discuss several design issues for home gateway architecture that effectively distributes realtime broadcasting contents (from either the headend in the access network or the satellite/terrestrial broadcasts) to heterogeneous devices in the home network.

• ETRI Journal
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• 제28권5호
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• pp.561-573
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• 2006

In this paper, we present a practical implementation of the MPEG-21 multimedia framework for broadcasting and communication convergent services. MPEG-21 standard technology was exploited to build a convergent service framework. Using this framework, a service model and several scenarios have been successfully designed and implemented. In addition, interoperability, which is the main objective of a multimedia framework, especially in a convergent environment consisting of heterogeneous networks and various types of devices, has been addressed in detail. The experimental results show that the implemented test bed provides a next-generation multimedia service; that is, universal multimedia access (UMA), meeting the requirements of a broadcasting and communication convergent environment.