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— Cooperative systems in transportation can bring new intelligence for vehicles, roadside systems, operators and individuals by creating a communications platform allowing vehicles and infrastructure to share information. The performance of this underlying communication system has a major impact on the effectiveness of the emerging applications for(More)
Although technology has not yet reached Weiser's predictions, progress to advance state-of-the-art in ubiquitous computing is well underway. In particular new software is being developed to implement intelligent environments that sense and adapt to changes in the physical environment and the user's task and context. Inside these smart worlds, doors open(More)
There are two basic ways to deploy wireless LAN access points in an indoor scenario: manual deployment using a site survey based on empirical measurements or planning using a software tool with built-in signal propagation models. In this paper advantages and disadvantages of both ways are discussed. The planning based on propagation modeling is recognized(More)
—It is known that Particle Filter and Map Filtering techniques can be used to improve the performance of positioning systems, such as Pedestrian Dead Reckoning (PDR). In previous research on indoor navigation, it was generally assumed that detailed building plans were available. However, in many emergency / rescue scenarios, there may be only limited(More)
Particle Filter (PF) techniques has been widely used in indoor localization systems. They are often used in conjunction with pattern matching based on Received Signal Strength Indication (RSSI) fingerprinting. Several variants of the particle filter within a generic framework of the Sequential Importance Sampling (SIS) algorithm have been described. The(More)
Localization systems will evolve towards autonomous system which will use any useful information provided by mobile devices taking the hardware specification and environmental limitations into account. This paper demonstrates the concept of opportunistic localization using a smart phone with the following sensor technologies: Wi-Fi, GSM, GPS and two(More)
  • Martin Klepal, Doc Ing, Pechač Pavel, D Ph, Pavel Pechač, Miloš Mazánek +2 others
  • 2003
In the 1980s, Prof. Novotný and Dr. Pechač put heads together at the Faculty of Electrical engineering at the Czech Technical University in Prague, and thought up first fundaments of easy and rapid method of ray propagation. After graduating, I started enthusiastically working on indoor propagation modelling based on semi-empirical models and on full ray(More)