Papers by Alexandru Barleanu
Wearable Ballistocardiography system for heartbeat detection
2016 International Conference and Exposition on Electrical and Power Engineering (EPE), 2016
Solenoid-operated valve control under adverse mechanical conditions such as vibrations or shocks
2012 16th International Conference on System Theory Control and Computing, 2012
ABSTRACT
Circuits and Systems, 2013
The paper consists in the use of some logical functions decomposition algorithms with application... more The paper consists in the use of some logical functions decomposition algorithms with application in the implementation of classical circuits like SSI, MSI and PLD. The decomposition methods use the Boolean matrix calculation. It is calculated the implementation costs emphasizing the most economical solutions. One important aspect of serial decomposition is the task of selecting "best candidate" variables for the G function. Decomposition is essentially a process of substituting two or more input variables with a lesser number of new variables. This substitutes results in the reduction of the number of rows in the truth table. Hence, we look for variables which are most likely to reduce the number of rows in the truth table as a result of decomposition. Let us consider an input variable purposely avoiding all inter-relationships among the input variables. The only available parameter to evaluate its activity is the number of "l"s or "O"s that it has in the truth table. If the variable has only "1" s or "0" s, it is the "best candidate" for decomposition, as it is practically redundant.
Circuits and Systems, 2013
In this paper, the authors continue the researches described in , that consists in a comparative ... more In this paper, the authors continue the researches described in , that consists in a comparative study of two methods to eliminate the static hazard from logical functions, by using the form of Product of Sums (POS), static hazard "0". In the first method, it used the consensus theorem to determine the cover term that is equal with the product of the two residual implicants, and in the second method it resolved a Boolean equation system. The authors observed that in the second method the digital hazard can be earlier detected. If the Boolean equation system is incompatible (doesn't have solutions), the considered logical function doesn't have the static 1 hazard regarding the coupled variable. Using the logical computations, this method permits to determine the needed transitions to eliminate the digital hazard.
DC bus voltage efficient sinusoidal multiple-phase generation with adapted saturation handling
2014 18th International Conference on System Theory, Control and Computing (ICSTCC), 2014
Floating-point to fixed-point code conversion with variable trade-off between computational complexity and accuracy loss
This paper describes a method of converting floating-point expressions into equivalent fixed-poin... more This paper describes a method of converting floating-point expressions into equivalent fixed-point code in DSP software. Replacing floating-point expressions with specialized integer operations can greatly improve the performance of embedded applications. This is a new method that is developed for Direct-Form I filters with constant coefficients and input variables whose low/high bounds are known. Two conflicting objectives are considered simultaneously: computational complexity and accuracy loss. The algorithm presented here can construct multiple fixed- point solutions for the same floating-point code: from "high- complexity-high-accuracy" to "low-complexity-low-accuracy". A so-called cost function conducts the data flow transformation decisions. By changing the cost function coefficients, different fixed-point forms can be obtained. The data flow transformation takes very little time: less than 100 milliseconds for a 32-tap FIR filter. The generated fixed-poin...
— Spiking neural networks are designed for modeling the natural neural tissue physiology in order... more — Spiking neural networks are designed for modeling the natural neural tissue physiology in order to increase the biological plausibility of the artificial neural structures. The best option to obtain real time response of spiking neural networks is to implement the artificial neurons in analogue hardware. Despite the fast operation, a disadvantage of analogue spiking neural networks is the difficulty in prototyping of high complexity artificial neural areas because the connections between neurons, as well as, between neural areas should be hardwired. A solution that allows fast reconfiguration of spiking neural networks during prototyping represents wireless communication that also ensures communication at significant distance between artificial neural areas. This paper presents a method to implement wireless communication in RF range between areas of electronic neurons. Also, we tested using a microcontroller how this method affects the normal operation of the electronic neural network taking into account that wireless synapses implies conversion of voltage levels to digital values, data transmission delay and restoration of voltage levels. The results showed that the difference between the energies generated by the neural network with and without modeled wireless synapses is not significant and the delay induced by the digital data transmission is reduced by the neural network activity. (Abstract) Keywords—electronic spiking neuron; wireless synapse; neural areas; synaptic configuration.
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Papers by Alexandru Barleanu