Adrian Lita

Articles

Below you can find a brief description of my articles. Some of them are scientific papers, some of them are application notes, reviews and other publications.

# Year Type Publisher Title
1 2018 Conference Proceeding ISSE Microcontroller based magnetometer for smart meters used in electrical energy measurement
2 2018 Conference Proceeding ISSE FPGA implementation quantum computation structures
3 2018 Conference Proceeding ISSE Embedded system for real time analysis of thermal images for prevention of water stress on plants
4 2018 Conference Proceeding ISSE Digital modem for distributed data acquisition and control systems used in intensive fruit farming
5 2017 Conference Proceeding SIITME Line encoder with serial data transmission for automotive applications
6 2017 Conference Proceeding SIITME Door automation system for smart home implementation
7 2017 Conference Proceeding SIITME Current consumption monitoring and analysis system for energy management improvement in an industrial complex
8 2017 Conference Proceeding ISSE Microcontroller based thermal enclosure for electronic boards testing
9 2017 Conference Proceeding ECAI Virtual instrumentation based acquisition and synthesis module for communication signals
10 2017 Conference Proceeding ECAI Conditioning and transmission module for resistive bridge sensors
11 2017 Book Chapter Springer Power Conversion and Energy Management for Mission-Critical Systems
12 2017 Book Chapter Springer Power Architectures and Power Conditioning Unit for Very Small Satellites
13 2016 Conference Proceeding SIITME Remote communication interface for sound and vibration sensors
14 2016 Conference Proceeding SIITME Real time system for extraction and playback of an instrumental sound
15 2016 Conference Proceeding ISSE Simulation of signals in digital television using LabView
16 2016 Conference Proceeding ISSE Remote measurements in education laboratories using LabView and DAQ cards
17 2016 Conference Proceeding ISSE Reconfigurable signal generator and simulator for testing the digital transmission circuits
18 2016 Conference Proceeding ISSE Real time system for instrumental sound extraction and recognition
19 2016 Conference Proceeding ISSE GSM based remote control for distributed systems
20 2016 Conference Proceeding ECAI LabView application used for remote control of a mobile robot with xBee
21 2016 Conference Proceeding ECAI Delta encoder for fiber optic based data transmission of signals from sensors
22 2015 Conference Proceeding SIITME Realtime system for shape extraction from an image
23 2015 Conference Proceeding SIITME Real time pcb diagnosis using FPGA implemented video analysis tool
24 2015 Conference Proceeding NER Open source oscilloscope for hobby users
25 2015 Conference Proceeding ISSE Realtime system for image acquisition and pattern recognition using Boolean neural network
26 2015 Conference Proceeding ISSE Fully integrated artificial intelligence solution for realtime route tracking
27 2015 Conference Proceeding ECAI Mobile system with realtime route learning using hardware artificial neural network
28 2015 Conference Proceeding ECAI Image search algorithms
29 2015 Conference Proceeding APEC A high efficiency wireless DC-DC converter
30 2014 Conference Proceeding SIITME Rocket data logger
31 2014 Conference Proceeding AFASES Multiprocessor system dedicated to multi-rotor mini-UAV capable of 3D flying
32 2012 Application Note Microchip Sensorless BLDC control with Back-EMF filtering using a majority function

Microcontroller based magnetometer for smart meters used in electrical energy measurement

Year: 2018 | Type: Conference Proceeding | Publisher: ISSE

In this paper is presented the implementation of a versatile magnetometer which is designed for applications in the field of electrical energy measurement, especially for smart meters used in advanced metering infrastructure. The magnetometer is the key element in a smart meter, performing contactless current sensing for precise power consumption computation. The proposed system uses a magnetic sensor with a sensitivity of 2.5 mV/Gauss and a measurement domain of 0−1000 Gauss. All the initial processing of the signal generated by the magnetic sensor, as well as other specific functionalities required by the magnetometer’s operation, like calibration and self testing, are realized with PIC16F876A microcontroller and few other complementary analog conditioning circuits. The connectivity of the equipment is ensured by a local RS232 interface and a Telit GE864 GSM/GPS module that allows the integration of the proposed microsystem into a larger smart grid. The innovative design of the proposed magnetometer relies on the intrinsic flexibility and reconfigurability offered by the microcontrollers technology, correlated with the advantages of the GSM interface which resulted in a efficient implementation solution that facilitate the development of intelligent electricity metering networks.

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FPGA implementation quantum computation structures

Year: 2018 | Type: Conference Proceeding | Publisher: ISSE

The use of quantum computation, according to theory, can bring substantial improvements to future computing systems. The problem is the still experimental and hardly accessible technology of their implementation. The article presents an original solution for implementing a quantum computing structure emulator. Unlike other types of emulators of this kind, the proposed solution is not only a qualitative assessment of the performance of the quantum algorithms, but also a method of their effective implementation using existing technologies. The paper will present the solution of representation of the qubit, quantum gates implementation as well as the quantum interferometer for a system with two qubits. To illustrate the proposed solution, we will also present the method of implementing a search algorithm: determining the parity of a Boolean function.

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Embedded system for real time analysis of thermal images for prevention of water stress on plants

Year: 2018 | Type: Conference Proceeding | Publisher: ISSE

Given the evolution of electronics technology and electronics equipment, their price has fallen, thus making them affordable for the use in new branches: industry, security, agriculture. In this paper we propose a complete integrated analysis system that can learn – through deep learning algorithm – several templates for one parameter (spatial temperature evolution) for the occurrence of water stress and can then recognize these preconditions in the real environment. The system can then generate alarms to farmers / researchers about the occurrence of water stress. The system uses a FLIR camera sensor and capture the spatial arrangement of temperature at plant level, make an local intelligent analysis and return different levels of alarm. Thus, instead of transmitting the image to the central station on a conventional channel, the system will perform an on-site analysis over a period, identify potential water stress by recognizing templates, and will only convey indications of the crop state.

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Digital modem for distributed data acquisition and control systems used in intensive fruit farming

Year: 2018 | Type: Conference Proceeding | Publisher: ISSE

The aim of this paper is to present the results regarding the simulation and implementation of a digital modem that is intended to be integrated in multipoint data acquisition and control systems which are used for intensive fruit farming applications. For increased efficiency the proposed design is based on the well-known quadrature phase shift keying technique (QPSK). The improved architecture of the modulator and demodulator that compose the modem ensures a very good robustness to the external perturbations allowing transmission speeds of around 250 kbit/s at signal-to-noise ratios above 5 dB. The novelty of the proposed work is given mainly by the particular development of the modem. In comparison with classical solutions, the proposed approach relying on spectral efficient and synchronous operated communication modules in conjunction with the advantages offered by the multipoint data acquisition and control methods allows a significant increasing of the efficiency and sustainability for the intensive fruit growing systems.

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Line encoder with serial data transmission for automotive applications

Year: 2017 | Type: Conference Proceeding | Publisher: SIITME

In this paper are presented the results regarding the implementation of a reliable encoder that is intended to be used in automotive applications for accurately transferring digital signals from different types of sensors, control elements and other peripheral components to a central processing unit. The designed module is capable to operate with various line coding schemes such are: NRZ (non-return-to-zero), RZ (return-to- zero), AMI (alternate mark inversion) and Manchester (phase encoding). During extensive simulations and practical measurements it was revealed that the maximum data communication speed achieved by the designed system is around 1 Mb/s, when the signal-to-noise ratio is maintained above 10 dB. The enhanced implementation of the proposed encoder, based on synchronized line-codes, offers good performances regarding the resistance to perturbations as well as an improved spectral shaping and clock recovering capabilities for obtaining efficient internal data transmission systems for vehicles.

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Door automation system for smart home implementation

Year: 2017 | Type: Conference Proceeding | Publisher: SIITME

In this paper is presented the design and the prototype implementation of a pneumatic door automation system intended to be used for access control in smart homes. The structure of the developed application is realized around the PIC 16F877A microcontroller which operates together with a pneumatic actuator based on a double acting cylinder controlled through an air distributor with solenoid valve. In the basic mode, the door opening and closing actions can be initiated manually by the user, through password authentification. The main parameters of the system can be configured locally, but an in- depth diagnoses and reconfiguration can be performed only through the serial interface which ensure the communication between the main module of the system and an external PC. Compared with other similar systems, the proposed implementation solution allows a high operation speed and very good reliability due to the pneumatic actuation. In addition, the door automation module can be integrated in a centralized access control system dedicated to the smart homes that has all the appliances and other electricity based equipments connected into a local network.

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Current consumption monitoring and analysis system for energy management improvement in an industrial complex

Year: 2017 | Type: Conference Proceeding | Publisher: SIITME

This paper presents a non-invasive and completely autonomous solution for monitoring the current consumption of an industrial complex. The solution is based on the use of self- harvesting current sensors and wireless data transmission to a local radio network, a gateway from local radio network to LoRa (low power - wide range) as well as to a server that receives and analyses data. Based on this analysis, a power management plan (consumer scheme) can be built for a manufacturing process. The system allows reducing global energy consumption by implementing a dynamic consumer scheme that can accommodate to one or more energy providers.

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Microcontroller based thermal enclosure for electronic boards testing

Year: 2017 | Type: Conference Proceeding | Publisher: ISSE

In this paper is presented a new approach for implementing a versatile temperature control and monitoring system for thermal enclosures based on Peltier thermoelectric elements. The system is intended to be used for temperature testing of equipped or unequipped electronic printed circuit boards (PCB). These types of tests regarding thermal aging and endurance are very important for verifying the long term reliability of the PCBs because they must be designed for different categories of applications which impose certain operational time periods in various thermal conditions. The control module of the thermal enclosure described in this paper is realized with PIC16F877 microcontroller that communicates through serial interface with a dedicated software application running on PC. The functional parameters of the system can be monitored either on a local LCD or on PC’s display. The testing procedures can be configured only from the software application. The power of the heating and cooling elements is around 36W allowing an effective temperature control in the range [-15 – 100] ̊C. Compared with classical implementations, the design using Peltier elements has the important advantage of been capable to operate within a wide range of temperatures, including negative values, which allows more accurate tests and a realistic characterization of the electronic boards.

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Virtual instrumentation based acquisition and synthesis module for communication signals

Year: 2017 | Type: Conference Proceeding | Publisher: ECAI

This paper presents a versatile implementation of a reconfigurable module for acquisition and synthesis of modulated signals that are specific to the modern communication equipments. The hardware structure of the system is elaborated mainly around the TDA 8702 high speed video digital-to-analog converter and ADC 0820 analog-to-digital converter, both connected in a configuration that is controlled by a dedicated virtual instrumentation application realized in LabVIEW. The external module of the system is connected to a PC through the parallel port. The designed structure can operate with a wide range of modulation techniques including double-sideband with suppressed or conserved carrier, frequency and phase modulations. In addition, the proposed module offers the possibility to acquire and study complex waveforms that are specific to various communications systems and also to test different circuits and configurations using the synthesized signals as input stimuli. Besides the intrinsic advantages resulting from the usage of virtual instrumentation based on LabVIEW graphical programming, the conversion hardware of the proposed module is relatively simple and can be implemented with low costs.

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Conditioning and transmission module for resistive bridge sensors

Year: 2017 | Type: Conference Proceeding | Publisher: ECAI

This paper presents an enhanced conditioning and transmission unit aimed for interfacing resistive bridge sensors with remote data acquisition and control systems. The proposed module uses a simple but reliable communication technique based on a combination between frequency and pulse width modulations. This design, based on two transmission methods, ensures the multiplexing on a single carrier of the information regarding the temperature and the unbalance of a resistive bridge sensor. The circuit is practically implemented around a relaxation oscillator architecture, having a central frequency of operation of 8kHz. The polarization of the sensor is realized with a pair of constant current sources for alleviating the influences introduced by the parasitic resistance of the connection wires but also for reducing the influences of the electrical noise. The immunity against perturbations is also inherently increased by the robust transmission method which allows easy and accurate recovering of the measured signals using a proper receiver structure. Compared with existing solutions, the proposed circuit has an improved architecture which makes it compatible with the implementation in integrated circuits technology for improved linearity, stability and compactness.

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Power Conversion and Energy Management for Mission-Critical Systems

Year: 2017 | Type: Book Chapter | Publisher: Springer

The need for high power density has been the trend of the power conversion industry for many years. The key to obtain a high power density is to increase system’s efficiency. In the case of space applications, there is the same need for high power density but with the very important note that the reliability of the system must not be compromised. In order to increase system’s efficiency while maintaining reliability, the latest soft switching converter topologies, high power density packaging, improved heat extraction and planar magnetics are used. Other key parameters are: the digital loop control and the digital energy management through microcontrollers, and digital signal controllers.

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Power Architectures and Power Conditioning Unit for Very Small Satellites

Year: 2017 | Type: Book Chapter | Publisher: Springer

Space agencies all over the world are interested today in very small satellites because of their advantages compared to heavier satellites. This chapter starts with the general characteristics, Earth orbits, eclipses and current missions of very small satellites. It continues with a brief summary of the component parts of the electrical power system: the array of solar cells, batteries for space applications, 3 power architectures and 19 maximum power point tracker’s algorithms. Authors’ attention is mainly focused on designing, simulation and practical demonstration of a prototype with a flexible hybrid proposed architecture of the power conditioning unit for very small satellites, whose component blocks are the battery charge unit (BCU) including the dc–dc converter, the digital controller, the BCU sensors circuitry and the BCU prototype) and the battery charge/discharge monitor unit (BCDMU) including the microcontroller, the BCDMU sensors circuitry, the battery switch, the battery heater and the telemetry system.

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Remote communication interface for sound and vibration sensors

Year: 2016 | Type: Conference Proceeding | Publisher: SIITME

In this paper are presented the results regarding the implementation of a communication interface dedicated for conditioning and remote transmission of measurement signals acquired from sound and vibration sensors. The interface contains two parts, an analog section, responsible with long distance signal transmission and a digital section that realize demodulation and analog-to-digital conversion of the received signal. The analog part of the interface uses the frequency modulation technique that is well known for its ability to operate in environments characterized by high levels of electrical perturbations, even when are realized high speed data transmissions. The acquisition of signals from sensors is realized with a resolution of 16 bits with a maximum speed of 200kS/s. In order to ensure the compatibility with various communication media and different types of sensors, the proposed circuit has adjustable carrier frequency in the range [0,01 – 0,5] MHz and offers also the possibility to select the carrier signal waveforms: square or sinusoidal wave. In addition, for increased versatility, the communication interface combines two alternative configurations, one based on phase-locked-loop (PLL) structure and the second based on quadrature oscillator with analogue multipliers. Both configurations were thoroughly tested for evaluating the performances of the proposed design. In comparison with other structures, the remote communication interface proposed in this work revealed good stability, accuracy and reliability. Also, the robustness and simplicity of the interface due to the use of frequency modulation technique represent other significant advantages.

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Real time system for extraction and playback of an instrumental sound

Year: 2016 | Type: Conference Proceeding | Publisher: SIITME

This paper presents an acquisition system for sound recording, typical spectral component identification and extraction of particular instruments from a soundtrack, based on each instrument's spectral components. This system is also capable of sound reproduction (playback) and its main feature consists of minimizing the delay between the recorded sound and the playback sound below 100ms. To achieve all these objectives, the proposed system consists of several components which will operate in parallel: the acquisition module which outputs the digital waveform of the sound and its FFT transform used for spectral representation; the comparison module, composed of associative modules which compares the closeness of the sound sample to certain templates which contain spectral representation of pre-recorded instruments, used to identify whether certain instrument is present; the spectral form extraction module which isolates a certain instrument from the original sound-mix, based on filtering the spectral components that don't belong to the respective instrument; the last module is the inverse FFT module, which converts the sound from spectral domain back to time domain. With the exception of the microphone, the analog-to-digital converter (ADC) and the digital-to-analog converter (DAC) capable of outputting the sound, all other operations are done by an SoC integrated system (Xilinx Zynq 7000).

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Simulation of signals in digital television using LabView

Year: 2016 | Type: Conference Proceeding | Publisher: ISSE

This paper presents an application for generating of all the signals in case of digital televisions corresponding to standard colour bar patterns, from primary RGB signals to YCbCr colour space digital signals. It was implemented in LabVIEW and can represents D1 and D2 format for DTV signals on 8 and 10 bits resolution. The application can be used for DTV signals teaching and analysing in case of different image patterns.

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Remote measurements in education laboratories using LabView and DAQ cards

Year: 2016 | Type: Conference Proceeding | Publisher: ISSE

This paper presents an application used in educational laboratory for multiple waveform measurement and display, for analysing of the operation of electronically circuits. It was implemented as virtual instrument in LabVIEW and uses a data acquisition card for electrical signals acquisition. The application can be used in educational laboratory for multiple signals measurement, record and time correlated displaying to help students to better understand the operation of the complex electronic circuits. Using the facilities offered by LabVIEW, this application was implemented to be accessed remotely for online measurement.

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Reconfigurable signal generator and simulator for testing the digital transmission circuits

Year: 2016 | Type: Conference Proceeding | Publisher: ISSE

In this article is presented the implementation of a new type of reconfigurable signal generator and simulator used for testing digital transmission circuits that requires complex modulated waveforms. In our experiments we choose as an example the quadrature amplitude modulation or quadrature phase shift keying (QAM/QPSK) signals. The proposed solution is based on a high-speed NI-USB-6251M data acquisition board connected to a computer running a LabVIEW application. The analog outputs of the board are used for applying the predefined test signals to the circuits that are under test. The response of the tested circuit is monitored using the inputs of the data acquisition board. The novelty of the proposed system is given by the association between a very flexible and user friendly graphical programming environment such as LabVIEW and a general purpose data acquisition board which lead to an attractive implementation solution for a virtual instrument capable to simulate, generate, and also test a multitude of circuits using various signals. Compared with the classical approaches, the system presented in this paper represents a versatile platform, with large spectrum of applications because, with proper configuration of the software application, can be generated a broad range of modulated signals, including arbitrary waveforms, the only limitation being the speed of the data acquisition/generation module.

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Real time system for instrumental sound extraction and recognition

Year: 2016 | Type: Conference Proceeding | Publisher: ISSE

This article presents a "smart sound sensor" solution. More specifically it is a system on a chip capable of extracting sound patterns from an input signal captured by a microphone, patterns that correspond to certain musical instruments. The aim is to identify sounds like: voices, ambient sounds or musical sounds. Such applications generally involve the presence of a computer that analyzes offline the audio sequence. There are also smartphone security applications that rely on voice recognition templates that were previously stored and which work by processing the input sequence offline, after recording. Unlike these methods, our solution enables online real time identification of a group of musical instruments and allows extracting of certain sound sequences that belong to a particular instrument so that it can be isolated for sole playing. The solution was implemented in an integrated system "sound sensor" that analyzes the input signal in real time and can give output data without additional elements.

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GSM based remote control for distributed systems

Year: 2016 | Type: Conference Proceeding | Publisher: ISSE

In this paper are presented the results regarding the implementation and testing of a novel type of remote control based on the data transmission facilities offered by the GSM network infrastructure and the processing power achieved by new generation of microcontrollers. The system is intended to be used in the development of complex distributed control applications that are specific to various automated industrial processes, including the manufacturing of printed circuit boards and electronic modules. The proposed control system was designed using a prototype board equipped with Atmega 328 microcontroller. For implementation of data communication between the remote modules that compose the distributed control system a Quectel M10 quad-band GSM/GPRS radio modem was used. The quality of the proposed design was evaluated through extended performances analysis focused on the delay time, maximum transfer rate, failure tolerance and reliability. The system allows versatile configuration of command’s structure and can operate with an extended set of commands for the remote modules. Also, compared with other implementation solutions the proposed design can be used almost in any location due to the large availability of the GSM infrastructure.

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LabView application used for remote control of a mobile robot with xBee

Year: 2016 | Type: Conference Proceeding | Publisher: ECAI

This paper presents an application for remote control of a mobile robot with XBEE wireless communication. The control of the mobile robot is realized by a PC within a software interface or by using a user mobile remote control. The application is implemented in LabVIEW and can be used for robot control and robot movement tracking.

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Delta encoder for fiber optic based data transmission of signals from sensors

Year: 2016 | Type: Conference Proceeding | Publisher: ECAI

In this paper are presented the results regarding the design and the implementation of a efficient delta encoder that is intended to be used for conditioning of signals from analogue sensors. In addition is proposed a dedicate circuit architecture for transmission of digitally encoded signals from sensors to remote measurement systems using a very reliable communication media that is represented by the optical fiber. The advantage of a reduced bit rate generated by the delta encoder correlated with the intrinsic advantages of the optical fibers, especially the immunity to electric perturbations, leaded to a attractive implementation solution for a conditioning interface that can be used in complex acquisition and measurement systems. Also, the proposed delta encoder and the fiber optic based transmission system can be used in didactical laboratories for teaching advanced communication techniques.

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Realtime system for shape extraction from an image

Year: 2015 | Type: Conference Proceeding | Publisher: SIITME

This paper presents a system of “image sensor” for recognition and counting of shapes present in an image. Result information is provided as identified object, position relative to the lower left corner of the image and the number of objects detected in a certain type of image. In other words, the system functions as a sensor, the image is the entry and the items extracted from it represent the output data. Experiments aimed basic shapes: rectangle, triangle, circle, but the work can be extended to other more complex forms. The system was implemented on a Zynq SOC 7000 (Xilinx) and can be used in many applications involving pattern recognition in real time.

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Real time pcb diagnosis using FPGA implemented video analysis tool

Year: 2015 | Type: Conference Proceeding | Publisher: SIITME

This paper presents a solution to diagnosis printed circuit boards in terms of wiring crossing, based on real-time image analysis. The image is captured using an ordinary video camera (web cam) that is placed above the board while a light source is placed under. The image is processed locally in the FPGA, and bright spots which indicate board cross are isolated. Through an Ethernet interface, the system allows the input “pattern” (correct PCB cross positions) to be compared to the processed image. The comparison can determine the exact position of the cross points and if it corresponds to the expected pattern. The system is meant to be an effective method of real time checking of the printed circuit boards' quality. For this paper we use the SoC circuit Zynq 7000 (XC7Z010).

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Open source oscilloscope for hobby users

Year: 2015 | Type: Conference Proceeding | Publisher: NER

The Internet of Things era is making hardware projects more accessible than ever to hobby and beginner users. As may of them work on their projects from home, there is a growing need for accessible tools, or even tools that they can build themselves for later use in other hardware projects. The main purpose of this paper is to present an open source solution for a portable oscilloscope, customized to meet the hobby working requirements. The small oscilloscope is very easy to use and communicatates via USB port for processing, logging and display. This oscilloscope is very useful in any electronics applications, being a very handy tool for students and hobbyists. The 2MSPS sampling speed and 8-bit resolution are considered to be enough for general-purpose hobby applications.

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Realtime system for image acquisition and pattern recognition using Boolean neural network

Year: 2015 | Type: Conference Proceeding | Publisher: ISSE

The system presented in this paper consists of an image acquisition module from a video camera, an image processing module, which performs conversion to monochrome format, and a neural network that takes the acquired images and performs the extraction of patterns from them. The system proposed by the authors is used for recognizing the orientation of objects in real time by analyzing images from a common video camera. The acquisition module is based on three high-speed AD converters. The remaining components: the digital image processor and the neural network used to classify the shapes of objects are both integrated into a FPGA circuit. All these ensure integration in one chip and a high speed response - typical requirements for a real-time system.

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Fully integrated artificial intelligence solution for realtime route tracking

Year: 2015 | Type: Conference Proceeding | Publisher: ISSE

In this paper the authors propose a solution in which an intelligent algorithm – genetic algorithm in our case – is used to generate commands for a robot in real time, so that the robot can determine the optimal moves considering several aspects: route tracking and low power consumption. Genetic algorithms are intelligent solutions for multi–criteria optimization and using them to find solutions to the optimization problems containing constrictions. However, they were designed as algorithms running on computer and therefore cannot ensure rapid generation of the solutions. On the other hand, the problem of determining the optimal response to command a robot requires real time response. The paper presents a method for hardware implementation and integration in a FPGA circuit of a genetic algorithm, in order to accelerate the convergence and to generate solutions in real time.

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Mobile system with realtime route learning using hardware artificial neural network

Year: 2015 | Type: Conference Proceeding | Publisher: ECAI

This article presents a solution for tracking a mobile system using an artificial neural network. The mobile system collects data from the environment using an ultrasonic transmitter and receiver then data is processing using a binary artificial neural network. Some templates have been pre-loaded into the system to avoid blockages or additional routes. The solution is implemented on a SOC manufactured by Xilinx: Zync7000 Artix which consists of an FPGA and an ARM processor. The FPGA contains hardware neural network, command units and acquisition unit, while the processor contains the interface that provides patterns for learning process and communication interface (Ethernet interface).

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Image search algorithms

Year: 2015 | Type: Conference Proceeding | Publisher: ECAI

The color is one of the most important factors for an image description is a comparative study of color spaces RGB, HSV, XYZ, l1l2l3, color image processing and analysis using main methods of transformation and exploitation of color type visual information from images, sets, color space appropriate for the purposes of information retrieval as accurate. The results are shown graphically processing statistically but not least through images. One of the most basic operations you can do with images is to ask "how similar are two pictures?" If we can reasonably answer such a question, the possibility of very many applications open: Internet image search, digital libraries or object recognition (by comparison with a prototype picture), which in turn allows then more sophisticated applications. Algebra provides us with some very simple tools with which we can solve very effective even part of the problem. For every image "measure" in some way a number of parameters that seem important for classification.

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A high efficiency wireless DC-DC converter

Year: 2015 | Type: Conference Proceeding | Publisher: APEC

This paper will present a converter design targeted to push the performance in respect of efficiency and power density for a 50W Wireless Charger for portable devices. The innovation will come from the topology, magnetic structure and the control method.

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Rocket data logger

Year: 2014 | Type: Conference Proceeding | Publisher: SIITME

The developed module was created to record data during the flight of a rocket and to permit to the user to retrieve the data after it was recovered. The entire structure was designed to withstand high accelerations and an unfriendly environment. The measure parameters are: rocket engine pressure, atmospheric pressure, acceleration and GPS indication on speed and height. A second important function of this logger is to count time and to trigger the ejection of the parachutes after a set time. The value of the time interval between launch and parachute ejection is set from a PC GUI. After recovering the rocket the data from the data logger is retrieved by connecting it to PC thought USB and on the PC side a GUI is used to control the data transfer and store the values in CSV format.

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Multiprocessor system dedicated to multi-rotor mini-UAV capable of 3D flying

Year: 2014 | Type: Conference Proceeding | Publisher: AFASES

The paper describes an electronic multiprocessor system that assures functionality of a miniature UAV capable of 3D flying. The apparatus consists of six independently controlled brushless DC motors, each having a propeller attached to it. Since the brushless motor requires complex algorithms in order to achieve maximum torque, efficiency and response time a DSP must be used. All the motors are then controlled by a main microprocessor which is capable of reading sensors (Inertial Measurement Unit (IMU)-orientation and GPS), receiving input commands (remote controller or trajectory plan) and sending independent commands to each of the six motors. The apparatus contains a total of eight microcontrollers: the main unit, the IMU mathematical processor and one microcontroller for each of the six brushless DC motors. Applications for such an apparatus could include not only military, but also search-and-rescue, geodetics, aerial photography and aerial assistance.

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Sensorless BLDC control with Back-EMF filtering using a majority function

Year: 2012 | Type: Application Note | Publisher: Microchip

The BLDC motor is used for both consumer and indus- trial applications due to its compact size, controllability and high efficiency. Increasingly, it is also used in auto- motive applications to eliminate belts and hydraulic systems, to provide additional functionality and to improve fuel economy, while reducing maintenance costs to zero. Since the electrical excitation must be synchronous to the rotor position, the BLDC motor is usually operated with one or more rotor position sensors. For reasons of cost, reliability, mechanical packaging and especially if the rotor runs immersed in fluid, it is desirable to run the motor without position sensors, which is commonly known as sensorless operation.

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