Background: Placed children have a higher risk of mental illness and negative development but it does not mean one can predict that it will go in a certain way for a certain child. Children belonging to a risk group can do well and vice versa, but it is the community and family care to balance the risk of a negative development Purpose: In this paper, the authors want to draw attention to the problems of children placed children's mental-being. The focus is on three different factors to get a broader picture of what may affect the mental health of foster children. Method: Descriptive literature review of scientific articles and literature. Results: The factors that form the basis of our study is continuous / discontinuous contact with the biological parents, interrupted foster placement and school outcomes for foster children. Theories selected to connect the various factors related theory and risk and protective factors. The results that have emerged show that foster children and young people feel worse than other children and young people who have not been children placed. School results are adversely affected by foster placement which has emerged in our study, and it is of great importance to the social, school, and family home cooperating to act against this. Conclusion: Reports and literature has been quite agree that foster children feel worse than other children in the community. The various factors that the study has highlighted, there was very little empirical data to collect, why did the authors broaden and think internationally. It would be desirable if it could be researched further in this area of ​​research the more there are, the more knowledge is given to social workers who work with disadvantaged children in their everyday lives.

This thesis presents basic structure and entities of mobile network GSM. It presents principles of signalling with focus on core network via signalling systems SS7 and SIGTRAN. Chosen protocol layers and signalling message types are presented. The thesis is concluded by the design and implementation of the application emulating home location register of mobile users.

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