DEVELOPING IT&C DOMAIN PREMISE OF SUSTAINABLE DEVELOPMENT IN ROMANIA
In the information society, economic fields with advanced technology represent the main vector of development in consonance with the sustainable development of human society. The paper examines the evolution of economic sectors with high technology as the main component of the information society in Romania compared to EU countries, both in terms of number of companies and also production value, value added at factor cost, gross operating surplus, etc.. It is used to analyze statistical data from the years 2008-2012 from Eurostat databases, Undata and the National Institute of Statistics.
Comparative Analysis on the Inluence of the Economic Crisis on Education in some European Countries
Purpose – This study intends to present some inluences developed during the economic crisis related to the education area in some European countries. The study wants to present a comparative analysis among these European countries. Design/Methodology/Approach – This study is based on the Eurostat data series and is designed due to the statistical data processing. Findings – The study revealed some information and ideas about certain aspects as: changes of population structure by educational attainment level, evolutions of the shares with irst and second stage of tertiary education, investments in education and training, age distributions for teachers and trainers, participation rates in education. Research Limitations/Implications – This research is based on Eurostat data series considered relevant by the authors and on some other related analyses or research studies. The paper describes case studies from most of European countries but focuses only on few of them. Practical Implications – This study clariies the inluences of the economic crisis on education in some European countries in order to present a real image related to the evolution of education among Europe. Originality/Value – Even though different studies in the education ield were developed, this subject was not analyzed in the manner carried out in this paper.
LYAPUNOV-BASED TRANSFER BETWEEN ELLIPTIC KEPLERIAN ORBITS
We present a study of the transfer of satellites between elliptic Keplerian orbits using Lyapunov stability theory specific to this problem. The construction of Lyapunov functions is based on the fact that a non-degenerate Keplerian orbit is uniquely described by its angular momentum and Laplace (- Runge-Lenz) vectors. We suggest a Lyapunov function, which gives a feedback controller such that the target elliptic orbit becomes a locally asymptotically stable periodic orbit in the closed-loop dynamics. We show how to perform a global transfer between two arbitrary elliptic orbits based on the local transfer result. Finally, a second Lyapunov function is presented that works only for circular target orbits.