We study the problem of energy-efficient target tracking in underwater wireless sensor networks (UWSNs). Since sensors of UWSNs are battery-powered, it is impracticable to replace the batteries when exhausted. This means that the battery life affects the lifetime of the whole network. In order to extend the network lifetime, it is worth reducing the energy consumption on the premise of sufficie...

Risk and cost are important factors in Hazmat routing problem. While the local authorities try to minimize risk, transport companies plan to reduce cost. In emergency situation, time is an important issue and should be minimized to carry vital substances of Hazmat. This is a serious concern when petrol and other fuels should be transported to the areas which are probably affected by heavy rain ...

A new inventory model that considers both cost and emission functions is proposed for environments where temperature-controlled items need to be stored at a certain, non-ambient temperature and to do so modular temperature-control units are used. Transportation unit capacity and storage unit capacity are considered, which results in non-linear, non-continuous cost and emissions functions. A set...

In this paper we focus on the problem of assigning uncertainties to single-point predictions. We introduce a cost function that encodes the tradeoff between accuracy and reliability in probabilistic forecast. We derive analytic formula for the case of forecasts of continuous scalar variables expressed in terms of Gaussian distributions. The Accuracy-Reliability cost function can be used to empi...

We consider the problem of reduction of computation cost by introducing redundancy in the number of ports as well as in the input and output sequences of computation modules. Using our formulation, the classical “communication scenario” is the case when a computation module has to recompute the input sequence at a different location or time with high fidelity and low bit-error rates. We then co...

Imagine a resource allocation scenario in which the interested parties can, at a cost, individually research ways of using the resource to be allocated, potentially increasing the value they would achieve from obtaining it. Each agent has a private model of its research process and obtains a private realization of its improvement in value, if any. From a social perspective it is optimal to coor...

The quality of operational processes is an important driver of hospital performance. In particular, processes that reliably deliver both evidence-based and patient-centered care, which we refer to conformance and experiential quality, respectively, have been argued to result in better clinical outcomes. However, hospitals, in general, struggle to perform well on these process quality dimensions...

We study scheduling problems on a machine of varying speed. Assuming a known speed function (given through an oracle) we ask for a cost-efficient scheduling solution. Our main result is a PTAS for minimizing the total weighted completion time on a machine of varying speed. This implies also a PTAS for the closely related problem of scheduling to minimize generalized global cost functions. The k...