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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Firefly Clock Synchronization in an 802.15.4 Wireless Network | Hindawi Publishing Corporation EURASIP Journal on Embedded Systems Volume 2009 Article ID 186406 17 pages doi 10.1155 2009 186406 Research Article Firefly Clock Synchronization in an 802.15.4 Wireless Network Robert Leidenfrost1 and Wilfried Elmenreich2 1 Institute of Computer Engineering Vienna University of Technology 1040 Vienna Austria 2 Mobile Systems Group Institute of Networked and Embedded Systems University of Klagenfurt 9020 Klagenfurt Austria Correspondence should be addressed to Robert Leidenfrost robert.leidenfrost@gmx.at Received 2 September 2008 Revised 19 February 2009 Accepted 30 March 2009 Recommended by Volker Turau This paper describes the design and implementation of a distributed self-stabilizing clock synchronization algorithm based on the biological example of Asian Fireflies. Huge swarms of these fireflies use the principle of pulse coupled oscillators in order to synchronously emit light flashes to attract mating partners. When applying this algorithm to real sensor networks typically nodes cannot receive messages while transmitting which prevents the networked nodes from reaching synchronization. In order to counteract this deafness problem we adopt a variant of the Reachback Firefly Algorithm to distribute the timing of light flashes in a given time window without affecting the quality ofthe synchronization. A case study implemented on 802.15.4 Zigbee nodes presents the application of this approach for a time-triggered communication scheduling and coordinated duty cycling in order to enhance the battery lifetime of the nodes. Copyright 2009 R. Leidenfrost and W. Elmenreich. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction In South-East Asia huge swarms of fireflies synchronously emit light flashes to attract mating partners 1 . This paper describes the adaption .
