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This paper proposes a multiple predictive control strategy in order to control a combination of substrate concentrations inside of an anaerobic digestion process of microalgae. Based on the linear approximation of the original nonlinear model, an optimal control algorithm was developed and tested by simulation experiments. The obtained results validate the effectiveness and robustness of the proposed...
In the last years the European Space Agency (ESA) has developed several programs that support the creation of small satellites, called CubeSats, by different universities from within the member states. Because of their limited size, those satellites can pack, at most, very small attitude control devices which can generate only some limited torque. It is thus important for the designers to be able...
In this paper we present a C programming language implementation of a predictive control algorithm. The code was compiled and run under the same set of hypotheses using a standard open-source C compiler, and on three real time platforms, each with different technical specifications.
This paper discusses the technical and management experience gained in the day-by-day operation of the EuroPKI infrastructure. First the context where EuroPKI was born is explained, along with its certification philosophy. Then common certification practices are discussed, along with description of the services and applications offered by the EuroPKI partners. User-reported problems are also listed...
This paper presents our proposal for a change of paradigm in what concerns student education and evaluation. It is based on efficient use of technology to improve the practical skills of students. The main difference between mainstream higher education and this proposal consists in the combination of how information is disseminated plus the way knowledge absorption is validated by the educators.
Public-key infrastructures are increasingly being used as foundation for several security solutions, such as electronic documents, secure e-mail (S/MIME), secure web transactions (SSL), and many others. However, there are still many aspects that need careful consideration before these systems can really be used on a very large scale. In this respect, one of the biggest issues to solve is certificate...
This paper presents the modeling, estimation and control of an induction motor. Starting with the linear approximation of the original nonlinear model of the motor, an on-line parameter estimation algorithm was developed. The algorithm deals with stator windings variations due to temperature oscillations. The resulted linear model was used, in order to control the rotor speed of the induction motor,...
This paper presents efforts in the direction of teaching computer programming concepts to young students (kids in the range 8–15 years old). This work is both innovative and attractive for Romanian primary and secondary schools in the field of computer programming. The authors believe that involvement in this work field could prove beneficial for the national educational policy, and consequently,...
This paper presents our current effort in building a public-key infrastructure supporting security services within our university. Digital certificates are meant to provide authentication and confidentiality for entities engaging in electronic transactions, and flexible access control management for administrators of IT services.
This paper discusses some design and management issues in running an open PKI, based on the experience gained in the day-by-day operation of the EuroPKI infrastructure. The problems are discussed with an historical perspective that includes real-life lessons learnt in EuroPKI about certification practices, services and applications. User-reported problems are also discussed to identify problems that...
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