Employing multiple base stations is an attractive approach to enhance the lifetime of wireless sensor networks. In this paper, we address the fundamental question concerning the limits on the network lifetime in sensor networks when multiple base stations are deployed as data sinks. Specifically, we derive upper bounds on the network lifetime when multiple base stations are employed, and obtain...

We investigate the optimum reachability problem for MultiPriced Timed Automata (MPTA) that admit both positive and negative costs on edges and locations, thus bridging the gap between the results of Bouyer et al. (2007) and of Larsen and Rasmussen (2008). Our contributions are the following: (1) We show that even the location reachability problem is undecidable for MPTA equipped with both posit...

Wireless multi-hop relay systems are important technologies in mobile communications. These systems ensure high-speed data transfer and extended coverage area at a low cost. This paper investigates the position of a relay problem for the maximum capacity enhancement of a twoway Relay Node (RN) to achieve an efficient and scalable Long Term Evolution-Advanced (LTE-A) wireless network design. The...

This paper exploits the different properties between the local neighborhood of global optimum and those of local optima in image registration optimization. Namely, a global optimum has a larger capture neighborhood, in which from any location a monotonic path exists to reach this optimum, than any other local optima. With these properties, we propose a simple and computationally efficient techn...

This paper suggests a new method for designing an optimum deformation monitoring network using genetic algorithms. Optimization using genetic algorithms needs neither linearization nor differentiation of the object function or the constraint equations. As genetic algorithm uses simple mathematical computations it is easy to implement. In constraint problems one can use penalty functions to rede...

Four isozymes of alkaline phosphatase (AP) were purified from Elephas trogontherii (Steppe elephant) from different locations in the bone (outer and inner peripheral, cytosolic, and integral) using Sephadex G-200 gel filtration and TEAE-cellulose anion-exchange chromatography. The specimen was obtained from Erzurum Museum and its age was approx. 0.3-0.5 million years old. No fungi or bacteria w...