In this paper, we report our recent work on closed form solutions to the blocking and dropping probability in wireless cellular networks with handoff. First, we develop a performance model of a cell in a wireless network where the effect of handoff arrival and the use of guard channels are included. Fast recursive formulas for the loss probabilities of new calls and handoff calls are given. Alg...

The phytohormone abscisic acid (ABA) promotes plant water conservation by decreasing the apertures of stomatal pores in the epidermis through which water loss occurs. We found that Arabidopsis thaliana plants harboring transferred DNA insertional mutations in the sole prototypical heterotrimeric GTP-binding (G) protein alpha subunit gene, GPA1, lack both ABA inhibition of guard cell inward K(+)...

In this paper, we consider the cal1admission problem in cel1ular network with two classes of voice users. In the first part of paper, we introduce a two-threshold guard channel policy and study its limiting behavior under the stationary traffic. Then we give an algorithm for finding the optimal number of guard channels. In the second part of this paper, we give an algorithm, which minimizes the...

In the paper, we study a channel borrowzng scheme applzed zn a radzo cellular system where call queuezng and cutoff przorzty for handoff calls, whzch can zmprove the system performance, are also conszdered Because the tradeoff between the new call blockzng probabalzty and the forced termznatzon probabzlzty, we heurzstzcally define a cost function, whzch zs a lznear combznatzon of the new call b...

The molecular mechanisms by which higher plant cells take up K+ across the plasma membrane (plasmalemma) remain unknown. Physiological transport studies in a large number of higher plant cell types, including guard cells, have suggested that at least two distinct types of K(+)-uptake mechanisms exist, permitting low-affinity and high-affinity K+ accumulation, respectively. Recent patch clamp st...

The stomatal complex of Zea mays is composed of two pore-forming guard cells and two adjacent subsidiary cells. For stomatal movement, potassium ions and anions are thought to shuttle between these two cell types. As potential cation transport pathways, K(+)-selective channels have already been identified and characterized in subsidiary cells and guard cells. However, so far the nature and regu...

The effects of anion-channel blockers on light-mediated stomatal opening, on the potassium dependence of stomatal opening, on stomatal responses to abscisic acid (ABA), and on current through slow anion channels in the plasma membrane of guard cells were investigated. The anion-channel blockers anthracene-9-carboxylic acid (9-AC) and niflumic acid blocked current through slow anion channels of ...

iii ACKNOWLEDGEMENTS I would like to thank Cem Ersoy for his guidance throughout my PhD study, M. Ufuk Ça˘ glayan for being the model of an academician, Hakan Deliç for his comments on DS-CDMA systems, Abbas Yongaço ˘ glu for his short course on CDMA systems, Emre Çelebi for his valuable discussions and support in Linux, and Ian Anderson for the high spirits. I would also like to thank my wife ...

Previous studies have demonstrated that methyl jasmonate (MeJA) induces stomatal closure dependent on change of cytosolic free calcium concentration in guard cells. However, these molecular mechanisms of intracellular Ca(2+) signal perception remain unknown. Calcium-dependent protein kinases (CDPKs) function as Ca(2+) signal transducers in various plant physiological processes. It has been repo...