Articole din publicaţii internaţionale: Recent submissions

Now showing items 521-540 of 3232

Optical electronic computer systems design in stationary and dynamic modes

PERJU, Veacheslav L. (SPIE, 2001)

The theory of designing the optical-electronic image processing computer systems has been presented. A model of parallel image processing system has been considered, that is based on the principle of function decomposition. ...
Experimental estimation of the recognition reliability in the optical pattern recognition systems

PERJU, Veacheslav L.; CASASENT, David P.; MARDARE, Igor A.; CHIRCA, Oleg V. (SPIE, 2007)

A method of the recognition reliability estimation in the optical pattern recognition systems (OPRS) is described, based on of the similarity measures differences (SMD). It was theoretically justified and experimentally ...
Optical-electronic moments feature-based recognition system controlled by parameters of the input images

PERJU, Veacheslav L.; CASASENT, David P.; PERJU, Veacheslav V.; ZAVROTSCKI, Serghei N. (SPIE, 2003)

The new methods of invariant pattern recognition (IPR), based on the effective calculation of image moment features are presented. It is described the special purpose multiprocessor computer system, which realizes the ...
Design of the optoelectronic computer systems for image processing in stationary and dynamic modes

PERJU, Veacheslav L.; CASASENT, David P. (SPIE, 2004)

The theory of designing the optical-electronic image processing computer systems has been presented. A model of parallel image processing system has been considered, that is based on the principle of function decomposition. ...
The systems for persons' identification and verification on the basis of face correlation recognition

PERJU, Veacheslav L.; CASASENT, David P.; GALBEN, Andrei I.; CIUBOTARU, Octavian P. (SPIE, 2006)

In the article it is presented a PC based system for persons' identification and verification on the basis of face correlation recognition. There are described the structure and the functions, the software, the interfaces, ...
Optical-electronic technologies in materials analysis

PERJU, Veacheslav L.; CASASENT, David P.; FESHCHENKO, Valeriy S.; FESHCHENKO, Lubov V. (SPIE, 2005)

It is proposed a new optical electronic approach for effective, simple and non expensive testing of the materials. An optical correlator is used for high speed features extraction, which characterize the distribution of ...
Special-purpose optical-electronic computer systems controlled by image parameters

PERJU, Veacheslav L. (SPIE, 2000)

Are presented the results of elaboration and investigation of the new class of the optical-electronic reconfigurable image processing computing systems (IPCS), based on the conception of the computing means with the ...
Characterization of strained quantum well InGaAs/AlGaAs buried heterostructure lasers using internal second-harmonic generation

IACOVLEV, Vladimir P.; LUPU, Anatol T.; SYRBOU, Alexei V.; SURUCEANU, Grigore I.; KRAVETSKY, I. V.; CULIUC, Leonid L.; CHAND, Naresh (SPIE, 1994)

In this paper the investigation of internal optical second harmonic generation (SH) of buried heterostructure (BH) InGaAs/AlGaAs strained quantum well laser diodes is performed for additional characterization of these ...
Kinetic characteristics of SnO2 thin-film gas sensors for environmental monitoring

KOROTCHENKOV, Ghennadii S.; BRYNZARI, Vladimir I.; DMITRIEV, Sergei V. (SPIE, 1998)

In this report we presented results of gas sensitivity' kinetics analysis for undoped SnO2 thin films, deposited by spray pyrolysis method, using SnCl4x5H2O alcohol solution. The comparison of gas sensitivity's kinetics ...
Medium-power stabilized laser diode

SMEU, Emil; PUSCAS, Niculae N.; POPESCU, Ion M.; SURUCEANU, Grigore I.; ISPASOIU, Radu G. (SPIE, 1998)

Power stabilized DL's represent today convenient sources for radiometric applications, as transfer laboratory standards. Stability measurements were carried out and reported by other authors for different time intervals, ...
Enhanced internal second harmonic generation in InGaAs/GaAs/AlGaAs strained single-quantum-well buried-heterostructure laser diodes

ISPASOIU, Radu G.; PUSCAS, Niculae N.; SMEU, Emil; BOTEZ, C. E.; IACOVLEV, Vladimir P.; MEREUTZA, Alexandru Z.; SURUCEANU, Grigore I. (SPIE, 1998)

In this paper we report an indirect method based on photomultiplier response calibration to measure the radiant power of the internal second harmonic generation (ISHG) from InGaAs/GaAs/AlGaAs strained single quantum well ...
Analysis of phase-matching conditions for internal second-harmonic generation in InGaAs quantum well laser diodes

FRUNZA, M.; SMEU, Emil; PUSCAS, Niculae N.; POPESCU, Ion M.; SURUCEANU, Grigore I. (SPIE, 2001)

In this paper we present an analysis of the phase-matching conditions for internal second-harmonic generation in InGaAs quantum-well laser diodes in order to enhance the conversion efficiency. We have characterized the ...
UV radiation sensors with unitary and binary superficial barrier

DOROGAN, Valerian; VIERU, Tatiana; KOSYAK, V.; DAMASKIN, I.; CHIRITA, F. (SPIE, 1998)

UV radiation sensors with unitary and binary superficial barrier, made on the basis of GaP - SnO2 and GaAs - AlGaAs - SnO2 heterostructures, are presented in the paper. Technological and constructive factors, which permit ...
Optimization of thin-film gas sensors for environmental monitoring through theoretical modeling

BRYNZARI, Vladimir I.; KOROTCHENKOV, Ghennadii S.; SCHWANK, Johannes W. (SPIE, 1999)

The task of optimization of gas sensor characteristics such as absolute value and temperature range of sensitivity, time response and selectivity is one of the most important problems of gas sensor design. Unfortunately, ...
Quadrant detector based on InGaAsP heterostructures

DOROGAN, Valerian; BRYNZARI, Vladimir I.; VIERU, Tatiana; KOSYAK, V. (SPIE, 1998)

A new device called selective quadrant-detector, realized on the basis of InGaAsP heterostructures, is presented in the paper. It consists of a circular photodiode-quadrant with protective peripheric ring, having selective ...
Multilayer porous structures on GaN for the fabrication of Bragg reflectors

BRANISTE, Tudor; MONAICO, Eduard; MARTIN, Denis; CARLIN, Jean-François; POPA, Veaceslav; URSAKI, Veaceslav V.; GRANDJEAN, Nicolas; TIGINYANU, Ion M. (SPIE, 2017)

We report on the development of electrochemical etching technology for the production of multilayer porous structures (MPS) allowing one to fabricate Bragg reflectors on the basis of GaN bulk substrates grown by Hydride ...
Blue-red electroluminescence from hybrid Eu:phosphors/ZnO-nanowires/p-GaN LED

VIANA, B.; PAUPORTE, T.; LUPAN, O.; DEVIS, L.; GACOIN, T. (SPIE, 2021)

Nanowire (NW) based light emitting diodes (LEDs) have drawn great research interest due to many advantages compared to thin film based devices. Marked improved performances are expected from nanostructured active layers ...
Optical-electronic multiprocessors computer systems controlled by input images parameters

PERJU, Veacheslav L.; CASASENT, David P. (SPIE, 2005)

We present a new class of optical-electronic reconfigurable image processing systems, controlled by the parameters of the input image. The systems use multiprocessors and are distributed. We describe two different optical ...
The intellectual processor on basis of 2nd order objects in restoration of images

MARDARE, Igor; PERJU, Veacheslav L.; CASASENT, David P. (SPIE, 2007)

This paper deals with the problem of intellectual restoration of images. It is suggested to represent various objects and stages as objects of the first and second orders. Representation of dominant object as second order ...
Nanofabrication and diffractive and microrefractive optics element applications in compact sensor systems

CONSTANTINOV, Boris I. (SPIE, 2021)

The development of dynamical surface of viscous liquid with electrical charge is researched in the periodical restoring process of spatial deformation type crater. The possibility of obtaining of optical elements on PTPC ...

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