Opportunistic selection algorithms have grown in importance as next generation wireless systems strive towards higher data rates and spectral efficiencies. For example, in orthogonal frequency division multiple access(OFDMA), the system bandwidth is divided into many sub channels. For each sub channel, the user with the highest channel gain is opportunistically assigned to it. .Likewise, in a multi-source, multi-destination (MSD) cooperative relay system, a relay node must be assigned for every source-destination (SD) pair. The assignment decisions are based on local channel knowledge and must be fast so as to maximize the time available for data transmission. We develop novel multiple access based splitting-based selection algorithms for OFDMA and MSD systems. These systems are unique in that the same user and relay can be the most suitable one for multiple sub channels and multiple SD pairs, respectively. For OFDMA systems, we propose an algorithm called Split Select that assigns for every sub channel the user with the highest channel gain over it. For MSD systems, we propose a contention-based en masse assignment (CBEA) algorithm that assigns to each SD pair a relay that is capable of aiding it. Both Split Select and CBEA are fast and scale well with the number of nodes. For example, Split Select requires just 2.2 slots, on average, to assign a sub channel to its best user even when there are an asymptotically large number of contending users. Likewise, CBEA often takes far less than one slot, on average, to assign a relay to each SD pair.

SYNOPSIS This thesis covers partial universe of civic society organizations that provide social services in Pardubice region. The primary goal of the thesis is to explore, through a questionnaire research, whether the income generated by these organizations is a determining factor in their association with the concept of social economy and social enterprise. The secondary goal is to identify, using semi-structured interviews with the representatives of civic society organizations, how they fulfill principles of social enterprise based to the "softer definition" developed by EMES. The first two chapters introduce concepts of public sector and social economy as well as identify their similarities and differences. It is followed by a description of social services and support of civic society organizations from the view point of several parties. The third chapter is dedicated to the actual research.

(English) The purpose of this diploma thesis was to analyze a role of Sputnik Česká republika (Sputnik Czech Republic) website as an information source in the ecosystem of the so-called alternative media. The main research method was quantitative content analysis. In the practical part of the work - using available metadata sraped with Outwit Hub -, this thesis described content of articles published on Sputnik Česká republika and other selected alternative media. Next, with the use of online marketing tools and other sources, it compared similarities of content and user behaviour. Next, it compared similarities of content and user behaviour on a sample of selected websites. The result of this was evaluation of possible importance of Sputnik Česká republika in the ecosystem of alternative media and pointing out some new elements and connections within this system. Possible usage of this thesis comprises follow-up research and education in fields of information and media literacy, especially in the issue evaluation of information sources.