Marcin Kardas

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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)
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt età la diffusion(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)
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