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The IEEE 802.15.4 LR-WPAN specifies low cost, low energy, low rate transmission of 20~250kbps and mostly within 10 meters of diameter. Its specification of PHY and MAC layers can be used as the lower layers of ZigBee technology [4]. As many applications for short range, wireless networking environment have been developed, the need for voice transmission over the IEEE 802.15.4 LR-WPAN has been also...
It is well known that CSMA/CA shows good performance in case of a few devices and low traffic rate but the more the number of devices and traffic rate increase, the more the performance decreases dramatically because of too much contention among the devices. It leads to increasing the retransmission rate it, as a result, brings about high energy consumption and if there are hidden terminal, performance...
The IEEE 802.15.4 LR-WPAN specifies low cost, low energy, low rate transmission of 20~250 kbps and mostly within 10 meters of diameter. Its specification of PHY and MAC layers can be used as the lower layers of ZigBee technology. As many applications for short range, wireless networking environment have been developed, the need for voice transmission over the IEEE 802.15.4 LR-WPAN has been also increased...
A strong oxidative stress-inducible peroxidase (POD) promoter was cloned from sweetpotato (Ipomoea batatas) and characterized in transgenic tobacco plants and cultured cells in terms of environmental stress. A POD genomic clone (referred to as SWPA2) consisted of 1824 bp of sequence upstream of the translation start site, two introns (743 bp and 97 bp), and a 1073 bp coding region. SWPA2 had previously...
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