báo cáo hóa học:" A power efficient MAC protocol for wireless body area networks" pot

... power efficient MAC. A TDMA-based approach has many advantages over other similar techniques such as CSMA/CA and FDMA. Authors of [12] have provided a comparison between TDMA and CSMA/CA as shown ... 5 Figure 6 A power efficient MAC protocol for wireless body area networks Moshaddique Al Ameen 1 , Niamat Ullah 1 , M Sanaullah Chowdhury 1 , S M Riazul Islam 1 an...

Ngày tải lên: 21/06/2014, 17:20

... scheme. MACA employs a RTS/CTS (request to send/clear to send) handshake between a transmitter and a receiver. In MACA, when a transmitter wants to send data packets, it begins with sending a RTS packet ... adjusted to an approximately similar value in two ways. One is to adopt an appropriate power level for tr ansmitting DATA/ACK, de- pending on the average distance from the tr...

Ngày tải lên: 22/06/2014, 22:20

... Journal on Advances in Signal Processing Table 2: Parameters used to calculate the probability of collision in the Channel MAC. Symbol Parameter a Propagation delay a Normalised propagation delay ... SIFS, ACK, and MAC- PHY header values of Channel MAC use similar values of IEEE 802.11 (basic access mode) for comparison purposes (the MAC- PHY header and ACK sizes are 400 and 240 b...

Ngày tải lên: 21/06/2014, 22:20

... nongaussianity since Gaussian variable has the largest en- tropy among all random variables of equal variance [16]. Be- cause it is difficult to calculate negentropy, an approximation is usually ... ram Counter x i 16 Clock Estimation process MUL MUX Random number generator MUL MUL ADD Data ram MUL ADD MUL DEC NORM CMP Data ram Output process Data ram Counter w out 16 (a) Read in process Data...

Ngày tải lên: 22/06/2014, 22:20

... before proceeding to transmit, then an ( H + P)/R amount of time to for an interface to transmit a packet consisting of H header and trailer bits and P pay- load bits at a data rate R,thenaτ amount ... 2011:131 http://jwcn.eurasipjournals.com/content/2011/1/131 Page 5 of 15 RESEARCH Open Access A QoS guaranteeing MAC layer protocol for the “underdog” traffic Mahasweta Sarkar 1*...

Ngày tải lên: 20/06/2014, 22:20

... now adopted AUC for evaluating predictive ability of classifiers owing to the fact that AUC is a better performance metric than accuracy [31]. In this study, AUC was used as a value to compare the ... as testing data and different nine-tenths of the data as training data. Finally, the average estimate over all runs was reported by running the above regular 10-fold cross-validation for...

Ngày tải lên: 18/06/2014, 15:20

... inter-pore distances and length. Surface modification and structural characterisation of prepared AAO The coating of ultra-thin metal films Au onto AAO (Au-AAO) was performed by metal vapour deposition ... based on a nanoporous AAO platform is simple, easy to miniaturise, inexpensive and has great potential for the development of gas sensing devices for a range of medical and e...

Ngày tải lên: 20/06/2014, 04:20

... (terry.chow@mail.mcgill.ca) Ayoub Nahal (ayoub.nahal@muhc.mcgill.ca) Chantal Seguin (chantal.seguin@muhc.mcgill.ca) ISSN 1749-799X Article type Research article Submission date 11 March 2011 Acceptance date ... examined according to the criteria of Arlet et al. namely presence of degeneration, necrosis, and disappearance of marrow cells as well as the nuclear disappearance and hypochromasia...

Ngày tải lên: 20/06/2014, 07:20

... extracted from the BWHHS database and recoded into binary categorical variables. This model derived from the BWHHS data was repli- cated using data from the “usual care” arm of a large Kamaruzzaman ... proposeafrailtymodeldevel- oped from factor analysis (FA), a rob ust analytical tech- nique which uses latent variables as a means of data reduction to represent a wide range of attribu...

Ngày tải lên: 20/06/2014, 15:20

... degree of approximation by Karamata summability method Hare Krishna Nigam and Kusum Sharma * * Correspondence: kusum31sharma@rediffmail.com Department of Mathematics, Faculty of Engineering and Technology, ... is a positive increasing function and using second mean value theorem for integrals, Nigam and Sharma Journal of Inequalities and Applications 2011, 2011:85 http://www.journalofineq...

Ngày tải lên: 20/06/2014, 22:20