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In this paper, we developed a simple and efficient method for identifying and automatic detection of the position of the optic disc and also the optic nerve in retinal images. The detection is performed by applying a gliding-box type algorithm and a decision criterion based on the extreme of the selected features. The size of the windows considered as sub-images was taken so that they include the...
The medical ultrasound images are usually tainted by a kind of noise called “speckle”. This noise is caused by the logical nature of the spreading occurrence. A simple hybrid scheme (combining Wiener and Mean filters) was designed in previous work [1] for denoising the medical ultrasound image. A performance comparison was made between the designed hybrid scheme and other filters (Wiener, Wavelet,...
This paper aims in evaluating the efficiency of magnetic stimulators capable of stimulating neural tracts of the spinal cord in healthy subjects. Our previous preliminary tests had shown that the commercial clinical magnetic stimulator Magstim Rapid2 was unable to activate nerve structures located in the spinal cord, with its maximum deliverable energy. In this study we evaluate the characteristics...
The work presents the errors induced by some geometrical imperfections underlying in the experimental realization of a 1st and 2nd order SQUID gradiometer with electronic subtraction. It will be discus the effect of the non identity coils of the magnetometer channels and the signal noise ratio for 1st and 2nd order magnetic field gradients for two different magnetic sources, one of disturbance and...
In order to achieve precise navigation information on the displacement of a vehicle in terms of position, speed, acceleration and direction we are suggesting the use of a new software procedure for processing data received from miniaturized inertial navigation systems. A new method for establishing the optimum decomposition level of the Wavelet transform is proposed. This method was used for filtering...
This paper presents a new technique of Reactive Power Optimization called Random Selection Paths RSP, where a new implementation depending on limit the region search and choosing the candidates of the control variables randomly has been applied. The objective function of the proposed algorithm is to minimize the system active power loss. The control variables are generator bus voltages, transformer...
A solution for better controlling the number of equipments which can be powered from photovoltaic panels is presented in this paper. A hardware and software system is used for acquiring environmental data. These data are then sent to a fuzzy logic software which decides the number of equipments that will be powered directly from the photovoltaic panels, with the rest beeing pluged into the national...
In this paper the authors present an analysis of the influence of different geometrical dimensions of the cross section of a permanent magnet synchronous motor to drive a bicycle on the size of its cogging torque. Thus are modified the stator slots isthmus width, the stator slots isthmus height, the stator teeth width (keeping slot pitch) and the width of the permanent magnet rotor (keeping the same...
Planar transformers are mainly used in power electronics but they can be also found in electric vehicles, medical applications, power sources, rectifiers and other devices. They have a lot of advantages like low profile, which leads to low core losses, higher efficiency, manufacturing repeatability, and reduced electromagnetic interferences. On the other side, there are a few aspects which must be...
In this paper, an algorithm aiming for reliability in wireless sensor networks (WSN) will be discussed. Reliability optimization in WSN is obviously an important problem, because a more reliable network can secure a correct, durable, and complete communication. Power consumption optimization in WSN is highly necessary in order to have a reliable sensor network because consumption of power by WSN is...
In this paper is optimized by numerical simulations a dc to dc boost converter with two parallel stages using the interleaved command technique. A comparative study between three converter topologies — one stage, two parallel stages and two interleaved stages is presented. First, the interleaved command converter is modeled in MULTISIM and is tested under many output loads. For comparison, simulations...
The paper presents a PWM control system of a sinusoidal voltage using a single-phase inverter that comprises at the output a LC low-pass filter with resistive load. The PWM control strategy of a sinusoidal voltage and the optimization of the control loop via the modulus criterion, for step input signals, are presented. The steady-state error of the PWM control system is analyzed for sinusoidal input...
This paper describes 2 mathematical models used to stabilize the behavior of the unstable loops of a superheated steam boiler operating on a constantly changing blast furnace gas fuel, and an on-line determination of the blast furnace gas calorific value. The superheated steam temperature loop, with dead times of 5–10 minutes, was modeled to obtain the shortest and most robust response time from the...
Present time is characterized by important changes, determined by significant advances in technology. The modern society is information oriented, technology dependent and collaborative-network active. The paper discusses the existing conditions of the transition period from the old meters to the smart meters, in terms of its impact and considering the different types of electricity consumers. It also...
Information technology changes and gives shape to networked society all over the world today and its solutions are becoming main drivers in almost all fields of human life activity. One of those solutions is the empowerment of e-government technologies through mobile solutions. Although the acceptance rate of e-government applications is increasing, e-voting is hardly accepted as main tool in its...
With the tremendous expansion of the Internet and devices connecting to computer networks, cyber security has become critical in information protection, data storage and use in the virtual environment. A system for detecting the user behavior in a network is a tool for Security Information and Event Management (SIEM). This technology provides real-time analysis of security alerts generated by applications...
This paper presents the driving system of a linear magnetostrictive motor (LMM) that operates in a wide range of frequencies of up to 16 kHz, which is intended for space applications. Accordingly, the design and control of the LMM differs from the classical version, causing changes in electrical driving conception. The LMM drive has two units Pulse Width Modulators (PWM) for the control of the activation...
Highlighting the inadequacies in terms of flicker indicators and proposals for overcoming them are the paper principal aims. High level sensitivity of the visual perception at luminance fluctuations as well as at flicker requires increased attention to this phenomenon, and also to the causes that produce them, careful highlighted in the paper.
Nowadays it is very important to use non-oriented electrical alloys, which must have a very good quality and must be cut through a proper method that leads to a minimum energy loss value. The manufacturers of the electrical machines want to minimize the damage of the magnetic properties during the cutting process, in order to produce high efficiency motors or generators. In this paper are presented...
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