báo cáo hóa học:" Research Article Design and Implementation of a Testbed for IEEE 802 15 4 (Zigbee) Performance Measurements" doc

... linearprogramming. We h ave proposed 2 different analytical ap-proximations of the state-check node update, one based on a Gaussian approximation and one very simple based on anerasure channel approach. The ... parameter along the decoding iterations.It is also known that an accurate single parameter is themutual information between the variables associated withthe variable nodes and their messages ... Article ID 748 90, 10 pagesdoi:10. 1155 /2007/ 748 90 Research Article Characterization and Optimization of LDPC Codes for the 2-User Gaussian Multiple Access ChannelAline Roumy1 and David Declercq21Unit´e...

... efficiency at an acceptable packetdelay and minimal energy consumption. In this context,among all IEEE 802 standards available today, the IEEE 802. 15. 4 (802. 15. 4) [3] is regarded as the technology of choice ... outp erforms IEEE 802. 15. 4 MAC in 43 .31% for a payload length packet of 50 bytes;(iii) BSN-MAC outperforms IEEE 802. 15. 4 MAC in7.20% for payload length packet of 80 bytes;(iv) DQ-MAC outperforms ... Model Validation and Performance EvaluationThe performance of the previously studied DQ-MACenergy-efficiency analysis is validated first with an analyticalrepresentation of the proposed model and...

... A. Piva and M. Barni 3 (a) (b)Figure 2: The BOWS interface to upload the attacked images and run the detector, as it appears before a successful attack (a) , and after a successful attack ... I.J.Cox,M.L.Miller,andJ .A. Bloom,Digital Watermarking,Morgan Kaufmann, San Francisco, Calif, USA, 2001.[5]S .A. Craver,I.Atakli,andJ.Yu.,“HowwebroketheBOWSwatermark,” in Security, Steganography, and Watermarking ... original form.By looking at the quality of the attacked images, we cansee that often the attacks concentrated on very small areas of the image (see Figure 5, where a particular of an attackedimage...

... timers of mobile nodesto the initialization phase and ask to broadcast theirlocation information locally.After the initialization phase, it is assumed that static and mobile nodes manage to have ... twwewelw@syr.eduReceived 25 April 2010; Revised 15 January 2011; Accepted 4 February 2011Academic Editor: Amiya NayakCopyright © 2011 T. Wimalajeewa and S. K. Jayaweera. This is an open access article distributed ... Proceedings of the 13th Annual ACM InternationalConference on Mobile Computing and Networking, pp. 39–50,Montral, Canada, 2007.[ 14] A. Verma, H. Sawant, and J. Tan, “Selection and navigation of mobile...