BACKGROUND The majority of pollen-tube growth in Arabidopsis occurs in specialized tissue called the transmitting tract. Little is currently known about how the transmitting tract functions because of a lack of mutants affecting its development. We have identified such a mutant and we used it to investigate aspects of pollen-tube growth. RESULTS Reverse genetics was used to identify mutations...

In a cognitive radio network, a primary user (PU) shares its spectrum with secondary users (SUs) temporally and spatially, while allowing for some interference. Consider the problem of estimating the no-talk region of the PU, i.e., the region outside which SUs may utilize the PU’s spectrum regardless of whether the PU is transmitting or not. And propose a adaptive boundary estimation algorithm ...

Today wireless networks are increasingly used to perform applications with Quality of Service constraints (QoS) such as delay, delivery ratio, and channel reliability. Especially, as demand for real-time transmissions increases, transmitting packets with hard delivery deadlines poses an important network control problem. In this thesis, we propose a framework for characterizing feasibility regi...