Within the domain of molecular communications, researchers mimic the techniques in nature to come up with alternative communication methods for collaborating nanomachines. This work investigates the channel transfer function for molecular communication via diffusion. In nature, informationcarrying molecules are generally absorbed by the target node via receptors. Using the concentration functio...

In this paper we consider the problem of estimating the propagation delays of the transmitted signals in an asynchronous direct-sequence code division multiple access (DS-CDMA) system operating over a fading channel. Two estimators based on subspace techniques are compared and the Cram er-Rao Bound, a lower bound on the variance of any unbiased estimator, is derived. Special attention is paid t...

In this article, passive acoustic sensor network localization is presented and applied to geometry structure monitoring. The methodology relies on passive travel-time estimation, which is here defined as the retrieval of an inter-sensor propagation delay, using uncontrolled ambient sources in an homogeneous acoustic propagation medium. Our approach relates to passive linear systems identificati...

Airline delay costs are incurred both on the day of operations (tactical cost) and at the planning stage (strategic cost). The latter may take the form of buffer in schedules. Strategic and tactical costs are not independent. Passenger costs of delay to the airline, crew, fuel, maintenance and fleet costs are quantified. Cost trade-offs are presented as a 3D plot assessing the ‘break-even’ poin...

We present a model for the electrophysiology in the heart to handle the electrical propagation through the Purkinje system and in the myocardium, with two-way coupling at the Purkinje-muscle junctions. In both the subproblems the monodomain model is considered, whereas at the junctions a resistor element is included that induces an orthodromic propagation delay from the Purkinje network towards...

New techniques for superscalar instruction issuing are presented. It is shown that the data dependency check for both in-order and out-of-order issuing can be performed in O(logw) gate delay using O(w2) primitive gates, where w is the size of the instruction buffer. Furthermore, we present a new counting based technique for assigning instructions to resources. It requires a delay of O(logw+logm...

This paper presents a novel approach for identifying non-robustly unsensitizable paths using the bounded gate delay model. It is shown that many non-robust paths will remain undetected unless the delay values are calculated at the path level rather than considering calculations at the circuit level bounded delay. As an initial step a canonical data structure is generated where each circuit path...

Wireless sensor networks are employed in several applications, including military, medical, environmental and household. In all these applications, energy usage is the determining factor in the performance of wireless sensor networks. Consequently, methods of data routing and transferring to the base station are very important because the sensor nodes run on battery power and the energy availab...

Repeated modular additions and overflow detection are possible in redundant hybrid number systems (RHNS). In this paper a circuit is proposed that implements the overflow-detecting procedure in such systems and allows a mean addition time of about 10.5 gate delays for numbers having a magnitude order normally distributed in the range [−233, 233 − 1], versus a 14 gate delay required by 32-bit CL...

In this paper the efficient implementation of numerical software for solving delay differential equations is addressed. Several strategies that have been developed over the past 25 years for improving the efficiency of delay differential equation solvers are described. Of particular interest is a new method of automatically constructing the network dependency graph used in tracking derivative d...