• Title/Summary/Keyword: 효율 성

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Clustering-based Cooperative Routing using OFDM for Supporting Transmission Efficiency in Mobile Wireless Sensor Networks (모바일 무선 센서네트워크에서 전송 효율 향상을 지원하기 위한 OFDM을 사용한 클러스터링 기반의 협력도움 라우팅)

  • Lee, Joo-Sang;An, Beong-Ku
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.10 no.6
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    • pp.85-92
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    • 2010

  • In this paper, we propose a Clustering-based Cooperative Routing using OFDM (CCRO) for supporting transmission efficiency in mobile wireless sensor networks. The main features and contributions of the proposed method are as follows. First, the clustering method which uses the location information of nodes as underlying infrastructure for supporting stable transmission services efficiently is used. Second, cluster-based cooperative data transmission method is used for improving data transmission and reliability services. Third, OFDM based data transmission method is used for improving data transmission ratio with channel efficiency. Fourth, we consider realistic approach in the view points of the mobile ad-hoc wireless sensor networks while conventional methods just consider fixed sensor network environments. The performance evaluation of the proposed method is performed via simulation using OPNET and theoretical analysis. The results of performance evaluation show improvement of transmission efficiency.

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An Adaptive FLIP-Levelset Hybrid Method for Efficient Fluid Simulation (효율적인 유체 시뮬레이션을 위한 FLIP과 레벨셋의 적응형 혼합 기법)

  • Lim, Jae-Gwang;Kim, Bong-Jun;Hong, Jeong-Mo
    • Journal of the Korea Computer Graphics Society
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    • v.19 no.3
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    • pp.1-11
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    • 2013

  • Fluid Implicit Particle (FLIP) method is used in Visual Effect(VFX) industries frequently because FLIP based simulation show high performance with good visual quality. However in large-scale fluid simulations, the efficiency of FLIP method is low because it requires many particles to represent large volume of water. In this papers, we propose a novel hybrid method of simulating fluids to supplement this drawback. To improve the performance of the FLIP method by reducing the number of particles, particles are deployed inside thin layers of the inner surface of water volume only. The coupling between less-disspative solutions of FLIP method and viscosity solution of level set method is achieved by introducing a new surface reconstruction method motivated by surface reconstruction method[1] and moving least squares(MLS) method[2]. Our hybrid method can generate high quality of water simulations efficiently with various multiscale features.

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