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DEMETRA, the “DEMonstrator of Egnss services based on Time Reference Architecture”, is an European Project funded by the European Union in the Horizon 2020 program. The main aim of the project was to develop and test a prototype of Time Service Provider based the European Global Navigation Satellite System (GNSS) providing innovative or improved time services based on different technologies and embedded...
The H2020 research project, DEMETRA (DEMonstrator of EGNSS services based on Time Reference Architecture) is funded by the European Union and aims to develop and test several time services based on the European Global Navigation Satellite System (GNSS) and introducing important new features such as certified time stamping, improved accuracy, or integrity, not yet provided by GNSS systems. The demonstrator...
In 2015 and 2016 a European Consortium of 15 scientific and industrial partners from 8 different countries collaborates on the DEMETRA (DEMonstrator of EGNSS services based on Time Reference Architecture) project, funded by the European Union in the frame of the Horizon 2020 program, aimed at developing and experimenting time dissemination services based on the European GNSS. The project aims at being...
DEMETRA aims to be a prototype of an European time dissemination service, based on the timing signal of the European Galileo system, adding particular features like - among the others - certification, calibration, or integrity, that could be of interest to a wide range of users belonging to different sectors as traffic control, energy distribution, finance, telecommunication, and scientific institutions...
DEMETRA (DEMonstrator of EGNSS services based on Time Reference Architecture) is a project co-funded by the EU through the research and innovation programme “Horizon 2020”. The DEMETRA project started in January 2015 and lasts 24 months. Based on the current practice of national metrological laboratories, identifying the additional necessities of the timing users, DEMETRA will define and develop a...
The majority of extreme preterm infants require endotracheal intubation and mechanical ventilation (ETT-MV) during the first days of life to survive. Unfortunately this therapy is associated with adverse clinical outcomes and consequently, it is desirable to remove ETT-MV as quickly as possible. However, about 25% of extubated infants will fail and require re-intubation which is also associated with...
A computer-based automatic alternating current (ac) bridge for impedance measurement is proposed. The problem of impedance measurement is formulated as a linear-in-parameter estimation one, and a suitable algorithm is proposed that ensures high measurement accuracy under a high convergence rate. In particular, the optimum experimental conditions regarding the reference resistance and the sampling...
One of the means to detect intruderpsilas activity is to trace all unauthorized changes in a file system. Programs which fulfill this functionality are called file integrity checkers. This paper concerns modern approach to file system integrity checking. It reviews architecture of popular systems that are widely used in production environment as well as scientific projects, which not only detect intruders...
Last year, during MIXDES 2007 conference authors presented 3 articles devoted to new approach to the digital control of DC/DC converters. In this paper authors present results of first tests of Buck converter prototype controlled by algorithm that uses law of conservation of energy. Control algorithm is executed by DSP processor that’ usually used in energoelectronics.
In the paper the new, original concept of controlling output voltage of DC/DC converters by using law of conservation of energy is presented. This concept was invented specifically to be used in mixed analog-digital and digital converter control devices. Conducted research shown, that controllers based on this method, practically aren't vulnerable to changes of working point and converters working...
In the paper an example of implementation of new, original DC/DC converter controlling concept is presented. It is designed to be used in regulators with DSP processors. Control device keeps energy accumulated in converter at steady level, and in this way indirectly forces required value of output voltage. To check the possibility of using this method in real life devices, regulators algorithm was...
In the paper verification of new DC/DC converters control method, designed by authors with use of law of conservation of energy is presented. A comparison was made between classic DC/DC converters used widely in industry (for comparison LT1074 Linear Technology device was chosen), with converters equipped with analog-digital controller designed by authors. Results of conducted simulation research...
The paper describes a concept of new polyharmonic power calibrator with error-sampled feedback loop in voltage and current generation paths. Digital polyharmonic signal sources and digital feedback loop were realized by applying the LMS adaptive algorithm. Performance of the calibrator resulting from LMS algorithm was discussed. The main advantages of the LMS polyharmonic calibrator are (i) simplified...
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