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Distance measurement by ZigBee technology
Čepl, Josef ; Šporik, Jan (referee) ; Hanák, Pavel (advisor)
The master's thesis deals with problems which is associated with rough detection of distance between wireless modules based on ZigBee technology. In the first logical part it theoretically describes this technology and their characteristics. This section gives basic informations needed to understand the operation of wireless communications and also acquaint him with some of the terms from this sphere. Next thing is description of the medium access together with a detailed description of functions that are crucial for deter-mining the signal strength. The second part is devoted to describe the 1321XDSK-BDM development kit. Another section is devoted to the design of the user's interface for displaying measured data. It consists of a theoretical design, which describes the initial vision of the device accompanied by solution of communication between wireless module and the proposed device. Follows the design of the involvement in Eagle software and explanation of the various components. In the last two chapters of the whole logical structure is described construction of the device and simple user's guide. The following chapter talks about the selection of suited application, necessary changes and own implementation of source code. There is even a description of important features and components of the application. The penultimate chapter contains a distance measurement in terrain using wireless modules and designed device. Here are tested different influences on the final distance measurement accuracy. In conclusion there is a debate over the results achieved. Particular, this section includes an assessment of precision measuring methods and evaluates aplicability of this method in practice.
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Measurements in an 802.11n radio network with hidden nodes
Vágner, Adam ; Komosný, Dan (referee) ; Münster, Petr (advisor)
The current large concentration of wireless networks brings new horizons, but also new concerns. Failure to follow basic rules may produce far-reaching problems that could make more wrinkles to all affected managers and administrators. The aim of this thesis was to measure and compare the radio parameters of selected products and how they behave in neighboring interference and the speed they have while there are hidden nodes. The resulting values were measured in the laboratory network Wificolab and compared with the various support protocols. Possible effects on the specific situation are also analyzed in this thesis.
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Measurements in an 802.11n radio network with hidden nodes
Vágner, Adam ; Komosný, Dan (referee) ; Münster, Petr (advisor)
The current large concentration of wireless networks brings new horizons, but also new concerns. Failure to follow basic rules may produce far-reaching problems that could make more wrinkles to all affected managers and administrators. The aim of this thesis was to measure and compare the radio parameters of selected products and how they behave in neighboring interference and the speed they have while there are hidden nodes. The resulting values were measured in the laboratory network Wificolab and compared with the various support protocols. Possible effects on the specific situation are also analyzed in this thesis.
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Distance measurement by ZigBee technology
Čepl, Josef ; Šporik, Jan (referee) ; Hanák, Pavel (advisor)
The master's thesis deals with problems which is associated with rough detection of distance between wireless modules based on ZigBee technology. In the first logical part it theoretically describes this technology and their characteristics. This section gives basic informations needed to understand the operation of wireless communications and also acquaint him with some of the terms from this sphere. Next thing is description of the medium access together with a detailed description of functions that are crucial for deter-mining the signal strength. The second part is devoted to describe the 1321XDSK-BDM development kit. Another section is devoted to the design of the user's interface for displaying measured data. It consists of a theoretical design, which describes the initial vision of the device accompanied by solution of communication between wireless module and the proposed device. Follows the design of the involvement in Eagle software and explanation of the various components. In the last two chapters of the whole logical structure is described construction of the device and simple user's guide. The following chapter talks about the selection of suited application, necessary changes and own implementation of source code. There is even a description of important features and components of the application. The penultimate chapter contains a distance measurement in terrain using wireless modules and designed device. Here are tested different influences on the final distance measurement accuracy. In conclusion there is a debate over the results achieved. Particular, this section includes an assessment of precision measuring methods and evaluates aplicability of this method in practice.
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Vegetation and tree growth analysis along altitudinal and latitudinal gradients in mixed-oak forests in mountain ecosystems of southern part of Korean penninsula
ALTMAN, Jan
This study deals with the altitudinal and latitudinal changes in mountain-temperate vegetation of mixed-oak (Quercus mongolica) forests in southern part of Korean Penninsula. 108 forest relevés containing 283 vascular plant species were described at elevations from cca 400-1500 m in four mountains from Seorak Mts. (38°N, 1708 m a.s.l.) to Mt. Halla (33°N, 1950 m a.s.l.). Vascular plants were identified to species, and their total cover and covers of individual species in herb (< 1 m), shrub (1 - 5 m) and tree (> 5 m) layers estimated using Braun-Blanquet scale. Both classification and ordination methods (TWINSPAN cluster analysis and Dentrended and Canonical Correspondence Analyses) were used to analyze the variability in plant species composition and species-environment relationships. Redundancy analysis was used to analyze the variability in Raunkiaer life-form spectra in forest vegetation along the main gradients. Linear regressions were used to relate the species richness and diversity values to environmental variables. Finally, tree growth pattern in stem diameter (radial growth) was analyzed based on tree-ring data in major woody species co-occurring in two contrasting forest communities.
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