The design and implementation team of computer automation systems for the Polish power industry faced many difficult problems connected with the lack of experience in this domain in the country. Another kind of problems was implied by different levels of information and communication technology in that country and in well developed ones. The differences were generated by both internal (importat...

Purpose: The study aims to investigate the impact of financial derivatives use on bank risk. For this purpose, banks operating in D-8 countries, are investigated. 
 Design/Methodology: While relationship between risk and derivative utilize is examined, some bank-specific control variables added model. Due sample structure endogeneity problem study, hypotheses were tested again by using Gen...

We study the (parameterized) complexity of SHIFT BRIBERY for multiwinner voting rules. We focus on the SNTV, Bloc, k-Borda, and Chamberlin-Courant, as well as on approximate variants of the Chamberlin-Courant rule, since the original rule is NP-hard to compute. We show that SHIFT BRIBERY tends to be significantly harder in the multiwinner setting than in the single-winner one by showing setting...

The goal of this paper is to propose and study properties of multiwinner voting rules (with a particular focus on rules based in some way on single-winner scoring rules). We consider, e.g., SNTV, Bloc, k-Borda, STV, and several variants of Chamberlin–Courant’s and Monroe’s rules, identify two natural approaches to defining multiwinner rules, and show that many of our rules can be captured by on...

Research background: Having a similar background before the 1990, ex-communist countries in Europe started to differentiate one from another terms of social and economic development. Nowadays, many aspects socio-economic environment, differences between them are significant. There factors be considered when analysing patterns evolution each country is taxation. The level taxation can lead struc...