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During the construction of the unbound pavement layers of Corridors X and XI in Serbia, a problem was detected regarding the evaluation of cleanliness of the available materials. The European standard for the sand equivalent from 1999 to 2015 had significant changes related to the test procedure. A mass correction has been taken into account. It consists of replacing a part of the fines with rinsed...
The often neglected problem in the service availability analysis is mapping between ICT-infrastructure and service-level availability. We present an approach which allows to map ICT-infrastructure elements to services, and to analytically assess steady-state, interval and user-perceived service availability, based on failure distributions of ICT-elements that implement a composite service. In case...
Simulation and testbeds are frequently used for the validation of wireless networking protocols, but several assumptions regarding node placement, wireless signal propagation, and traffic type must be made. We compare common models with the measurements made in Berlin’s and Leipzig’s free multihop wireless networks. It is shown that the properties observed in reality are different than in commonly...
Wireless mesh networks (WMN) are a low-cost technology that can be easily deployed in factories without costly production breaks. This makes them an excellent networking technology for M2M applications, but so far, their penetration in industries was marginal.
Wireless ad-hoc networks are typically deployed in a decentralized way, without an authority that determines the location of nodes or the time they join the network. Additionally, existing nodes may fail during network lifetime. Consequently, the geographical span (area) of the network is irregular and unknown. However, if known, this information can be used to improve efficiency of many wireless...
Measurement noise and unreliability of communication in wireless sensor networks (WSNs) make event detection a non-trivial and error-prone task. In order to reduce errors in the event detection, collaborative event detection was introduced.
We have developed a mathematical model for calculation of expected value of share of edges being dropped while constructing a Gabriel or a relative neighborhood graph starting from a random geometrical graph created by a homogeneous Poisson point process on a plane. The expressions for the expected values of number of faces and face size are derived as well. All expressions are given as functions...
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