Marcin Kardas

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In this paper we investigate leader election protocols for single-hop radio networks from the perspective of energetic complexity. We discuss different models of energy consumption and their impact on time complexity. We also present some results about energy consumption in classic protocols optimal with respect to time complexity - we show that some very(More)
Motivation Algorithm Analysis Distributed Counting Wireless network of simple devices (e.g. sensors, mobiles), the number of devices is unknown and can change dynamically Some knowledge of the network size is crucial for establishing a productive communication (e.g. to set back-o times) Most of the size estimation algorithms are distributed versions of(More)
In a single-hop radio network, nodes can communicate with each other by broadcasting to a shared wireless channel. In each time slot, all nodes receive feedback from the channel depending on the number of transmitters. In the Beeping Model, each node learns whether zero or at least one node have transmitted. In such a model, a procedure estimating the size(More)
In this paper we consider the problem of listing all active stations in a single hop radio network in such a way that the outer adversary observing communication could not gain any significant information about the real number of stations. We also consider a counterpart of this problem such that only a good approximation of the number of activated stations(More)
—In this paper we consider a model of spreading information in heterogeneous systems wherein we have two kinds of objects. Some of them are active and others are passive. Active objects can, if they possess information, share it with an encountered passive object. We focus on a particular case such that active objects communicate independently with randomly(More)
The 90 Sr and 137 Cs contamination in Polish surface waters has been monitoring since 1994. Surface water samples from six lakes and the Vistula and Oder Rivers were collected in spring and autumn 2012 and 2013. The mean 90 Sr and 137 Cs concentrations were 3.92 ± 0.40 and 4.49 ± 2.00 mBq L-1 , respectively. Correlations were identified between the(More)
In this paper we discuss energetic complexity aspects of k-Selection protocols for the single-hop radio network (that is equivalent to Multiple Access Channel model). The aim is to grant each of k activated stations exclusive access to the communication channel. We consider both deterministic as well as randomized model. Our main goal is to investigate(More)
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