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RISS 인기검색어
- 검색키워드
- 저자 : Chunming Qiao (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Improve Efficiency and Reliability in Single-Hop WSNs with Transmit-Only Nodes
Jia Zhao,Chunming Qiao,Sudhaakar, R. S.,Seokhoon Yoon IEEE 2013 IEEE transactions on parallel and distributed syst Vol.24 No.3
<P>Wireless Sensor Networks (WSNs) will play a significant role at the “edge” of the future “Internet of Things.” In particular, WSNs with transmit-only nodes are attracting more attention due to their advantages in supporting applications requiring dense and long-lasting deployment at a very low cost and energy consumption. However, the lack of receivers in transmit-only nodes renders most existing MAC protocols invalid. Based on our previous study on WSNs with pure transmit-only nodes, this work proposes a simple, yet cost effective and powerful single-hop hybrid WSN cluster architecture that contains not only transmit-only nodes but also standard nodes (with transceivers). Along with the hybrid architecture, this work also proposes a new MAC layer protocol framework called Robust Asynchronous Resource Estimation (RARE) that efficiently and reliably manages the densely deployed single-hop hybrid cluster in a self-organized fashion. Through analysis and extensive simulations, the proposed framework is shown to meet or exceed the needs of most applications in terms of the data delivery probability, QoS differentiation, system capacity, energy consumption, and reliability. To the best of our knowledge, this work is the first that brings reliable scheduling to WSNs containing both nonsynchronized transmit-only nodes and standard nodes.</P>
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Limei Peng,Chan-Hyun Youn,Chunming Qiao IEEE 2013 IEEE communications letters Vol.17 No.4
<P>This paper provides the first analysis of the impact of spectrum conversion on the lightpath blocking performance in the CO-OFDM optical networks. Two analytical models for the cases of using and not using spectrum convertors are developed for an H-hop end-to-end lightpath and a network, respectively. Numerical results show that the use of spectrum convertors can significantly improve the lightpath blocking performance.</P>
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Coordinated Locomotion and Monitoring Using Autonomous Mobile Sensor Nodes
Seokhoon Yoon,Soysal, O.,Demirbas, M.,Chunming Qiao IEEE 2011 IEEE transactions on parallel and distributed syst Vol.22 No.10
<P>Stationary wireless sensor networks (WSNs) fail to scale when the area to be monitored is unbounded and the physical phenomenon to be monitored may migrate through a large region. Deploying mobile sensor networks (MSNs) alleviates this problem, as the self-configuring MSN can relocate to follow the phenomenon of interest. However, a major challenge here is to maximize the sensing coverage in an unknown, noisy, and dynamically changing environment with nodes having limited sensing range and energy, and moving under distributed control. To address these challenges, we propose a new distributed algorithm, Causataxis, which enables the MSN to relocate toward the interesting regions and adjust its shape and position as the sensing environment changes. (In Latin, causa means motive/interest. A taxis (plural taxes) is an innate behavioral response by an organism to a directional stimulus. We use Causataxis to refer to an interest driven relocation behavior.) Unlike conventional cluster-based systems with backbone networks, a unique feature of our proposed approach is its biosystem inspired growing and rotting behaviors with coordinated locomotion. We compare Causataxis with a swarm-based algorithm, which uses the concept of virtual spring forces to relocate mobile nodes based on local neighborhood information. Our simulation results show that Causataxis outperforms the swarm-based algorithm in terms of the sensing coverage, the energy consumption, and the noise tolerance with a slightly high communication overhead.</P>
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A Novel Approach to Optical Switching for Intradatacenter Networking
Limei Peng,Chan-Hyun Youn,Wan Tang,Chunming Qiao IEEE 2012 Journal of lightwave technology Vol.30 No.2
<P>In this paper, we propose to apply a novel paradigm called labeled optical burst switching with home circuit (LOBS-HC) for intradatacenter networking to provide a high bisection bandwidth and significantly reduce the cost and energy consumption associated with electronic packet switching. The unique features of LOBS-HC that make it more suitable than either optical circuit switching (OCS) or optical packet/burst switching are exploited to enable all-to-all communications with a guaranteed lossless transmission bandwidth between any given pair of pods, while also supporting bursty transmissions through wavelength-sharing among home circuits (HCs) and statistical multiplexing. As a case study, hypercube-like topologies are considered for the interconnection among the pods within a datacenter. In particular, we first propose a simple but efficient HC assignment scheme called complementary HC for 2-D cube or ring, and then extend our works to n-cube and generalized hypercube by applying the concept of spanning balanced tree (SBT) for their HC assignment. Our analysis results show that with such datacenters, the minimum number of wavelengths needed in each case is significantly reduced from that needed with OCS and also, the network cost in terms of wires and transceivers needed is considerably reduced from that incurs with datacenters using electronic packet switching. We then evaluate the traffic performance of such hypercube-based datacenters using LOBS-HC through simulation experiments via the OPNET simulator. The performance results obtained for a variety of communication patterns and traffic models within a datacenter demonstrate the feasibility of the proposed approach.</P>
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