Ioana Adochiei

• Doctor of Engineering
• Lecturer at Military Technical Academy of Bucharest

The increasing prevalence of autism spectrum disorder (ASD) underscores its significant impact on individuals and the importance of early intervention. ASD affects various aspects of life, including education, emotional development, and social interactions. Besides traditional therapeutic approaches, a novel strategy incorporating digital games has...

This paper presents an indoor air quality (IAQ) monitoring system designed for a better end-user experience. The monitoring system consists of elements, from the monitoring sensor to the monitoring interface, designed and implemented by the research team, especially for the proposed monitoring system. The monitoring solution is intended for users w...

Individuals who are deaf or hard of hearing encounter many difficulties in their daily lives, especially when it comes to receiving important information during emergencies or disasters. Relying on others for updates can create a dependency that may hinder their ability to respond independently and effectively in critical situations. To address thi...

In this article, we discuss improving navigation accuracy by refining signals achieved from the inertial navigation system’s (INS) detection unit. The accuracy of navigation depends on inertial sensors to a large extent. However, their errors can cause interference with signals. Researchers have developed different calibration procedures to address...

The paper presents a solution for a positioning device for urban life mobility improvement based on MEMS- INS and GPS data fusion. Two stages are used to process the MEMS-INS and GPS data. At a first stage, which runs off-line, the data fusion uses a method coming from the bio-signal processing domain, i.e. an extension of the Partial Directed Cohe...

With the development of unmanned aerial vehicle (UAV) systems for a multitude of real-time applications, 3D printing technologies have been developed to make thermoplastic structures by fusing filament Fused Deposition Modeling (FDM) or Fused Filament Fabrication (FFF). However, we consider that the realization of new technologies of experimental m...

We present a way to integrate real-time multi-intensity transfer functions in a web browser environment using WebGL. We apply a two-pass rendering in order to establish the opacity and color of the given MRI recording. This pipeline helps viewing high resolution voxel domains and the adjustment of a transfer function for highlighting specific featu...

To achieve a positioning mechanism for urban life mobility improvement, a signal processing algorithm was tuned, using an ANFIS (Adaptive-Neuro-Fuzzy-Inference System) data fusion algorithm, with the experimental data collected from platforms equipped with Inertial Measurement Units (IMU) based on MEMS sensors and GPS receivers. In the paper’ secti...

The degradation of navigation accuracy and integrity of GPS in the presence of radio frequency interference, hostile jamming and high dynamical situations, when the satellite signals may get lost due to signal blockage, led to the development of MEMS-INS/GPS integrated navigation systems for various applications of the positioning and navigation te...

Developing Artificial Intelligence is a labor intensive task. It implies both storage and computational resources. In this paper, we present a state-of-the-art service based infrastructure for deploying, managing and serving computational models alongside their respective data-sets and virtual environments. Our architecture uses key-based values to...

In lumbar disc herniation a possible functional problem in the ambulation is the Foot-drop syndrome caused by radicular nerve pinching. This causes a dramatic loss in gait cycle efficiency. In the rehabilitation process patients may benefit from wearing a foot orthosis that prevents them from falling and secondary injuries. Evidence in the literatu...

In this paper, we propose a two electrodes configuration for noncontact long-term cardiac monitoring. Our system was designed as an alternative to Holter devices. Unlike a traditional long-term monitoring equipment, our system is stationary and non-contact, the cardiac signal is acquired through a capacitive coupling between the sensor and the subj...

Eye-tracking devices are currently used for improving communication and psychosocial status among patients with neuro-motor disabilities. This paper presents the experimental implementation of a control system for a robotic platform using eye tracking technology. The main system is based on an eye tracking subsystem that uses the circular Hough tra...

This paper presents an implementation of Direct Torque and Flux Control (DTC) scheme for Permanent Magnet Synchronous Motor (PMSM) drive, focusing on the development of the digital control. The control was designed so that to allow accurate sampling related to control update time, considering in addition a measurement scheme common to the low power...

Statistic data suggest that in 2040 a third of Europeans will be more than 70 years old and that falling is responsible of 75% of accidental deaths in people over 75 years old. This problem leads to a continuous concern for developing an advanced fall detection systems. We are proposing a module for human fall detection based on a miniaturized iner...

This paper presents the implementation of a research project focused on the use of robotics as an effective tool in teaching technical disciplines to dyslexic children. Dyslexia is the most common learning disability and affects between 5 and 12 percent of all students. The goal of this project is to develop educational programs which will boost sc...

The article is dedicated for identifying a mathematical model which describes the ensemble "pilot-aircraft" as an integrated system, being pointed out the pilot's particularities for aircraft command. In the paper are presented two compensatory models, based on the aircraft dynamics. Several approaches of the pilot models (transfer function gain, l...

This paper describes the implementation and experimental validation of a new 3D miniaturized inertial navigator developed for human indoor and outdoor monitoring applications. Accuracy is a major concern, especially during GPS outages and indoor applications. In order to increase the inertial navigation system (INS) standalone operation period with...

The paper exposes the experimental validation of a synergic INS/GPS navigator with direct application in the assistive positioning of the old people. The data fusion algorithm used in the integration procedure of the two navigators is based on a Kalman filter. For the experimental testing, the detection platform was boarded on a land vehicle and th...

In the last three decades many research teams have been doing advanced researches to develop accurate positioning and telemonitoring technologies. We developed an experimental model, a very light and ergonomic mobile platform, to identify cases with high human risk factor inside buildings. For positioning we designed an advanced INS/ GPS integrated...

In this paper is presented a mathematical model of the flow around the vertical tail of an airplane, based on the general elements of the aerodynamic design, with details leading to the separate formulation of the Fourier coefficients in the series solution of the Prandtl's lifting-line equation. Numerical results are obtained in Maple soft environ...

This paper focuses on the analysis of the longitudinal mechanical properties of Glass Fibre Reinforce Plastic (GFRP) plates with different fibre volume fraction, Vf, by considering both analytical and experimental methods. The laminate is 0/90 E-glass/epoxy woven composite material made by hand lay-up technique. Fiber volume fraction, determined by...

The paper present a new way to denoise the inertial sensors signals based on the wavelet functions tuned with Directed Transfer Function method. The method is applied in a bi-dimensional inertial navigator, and a GPS system is used to provide the reference signals used in the tuning process. Shown are: the basic principle of the wavelet tuning meth...

The here presented work refers to the development of a new bi-dimensional strap-down inertial navigator based on an algorithm that reduces their sensors noise by using a tuning method of the wavelet transform assisted by a GPS system. In this way is increased the INS standalone operation period with acceptable accuracy during the GPS outages. The t...

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 tra...

The paper exposes a wavelet filtering mechanism related to the noise suppression in the acceleration sensors, with direct application in the strap-down inertial navigation systems. The presented procedure is related to the actual trend in the inertial navigation field to use miniaturized inertial measurement units, which includes MEMS or NEMS senso...

In the current paper we propose a new software procedure for processing data from an inertial navigation system boarded on a moving vehicle, in order to achieve accurate navigation information on the displacement of the vehicle in terms of position, speed, acceleration and direction. We divided our research in three phases. In the first phase of ou...

At European level, we witness an increasing emphasis on the internationalization of higher education. The most important universities have as objective the development of student, teaching staff and researchers' mobility, as well as the compatibility of bachelor, MBA and PhD study programs. In this context, crossing national borders by universities...

There are few aircraft other than lighter-than-air vehicles that have the payload carrying capability, short field take-off, and slow speed ranges afforded by a powered parafoil. One very interesting aspect of the powered parafoils or paramotors, is their tendency to fly at a constant airspeed whether it is climbing, descending, or flying straight-...

The current article is aimed at implementing and validating software procedures by investigating the flying effects on pilots, algorithms that receive data from physiological data acquisition equipment and provide information on how the pilots' body reacts and adapts to various conditions of stress during flight. In particular, our concern was to i...

The main goal of this paper is to provide the latest developments in high level integrating of two different sides of a software system for pilots' performances enhancing, focusing on the data extraction and communication aspects concerning the assessment of the contribution of the lateral component of the virtual flight in the optimizing process....

The paper presents various structures conceived for acceleration detection based on optical principles. In this technological segment the efforts are usually concentrated on the development of fiber optic accelerometers and of fiber Bragg grating accelerometers. Principled, fiber optic accelerometers may encounter in different architectures. One of...

In medicine, there is a growing interest in gaining new insights into the main physiological control mechanisms functioning and interactions, both in health and in disease. Recently, we developed a new method, the Normalized Short Time Partial Directed Coherence (NSTPDC) method, for analyzing complex dynamic systems couplings. In this study, the re...

This paper provide the latest developments in high level integrating of two different sides of pilots' performances optimizing in virtual environment. First one focuses on the assessment of the contribution of the longitudinal component of the virtual flight in the performance optimizing process. The other one is oriented to modeling the contributi...

Partial Directed Coherence (PDC) method and its extensions proved to be useful tools in analysing couplings in multivariate dynamic systems. We introduced the normalised short time PDC method (NST-PDC), to investigate the dynamic behaviour of couplings. First simulated signals obtained from coupled oscillators were analysed and information about th...

Recently, methods have been developed to analyse couplings in dynamic systems. In the field of medical analysis of complex cardiovascular and cardiorespiratory systems, there is growing interest in how insights may be gained into the interaction between regulatory mechanisms in healthy and diseased persons. The couplings within and between these sy...

The paper presents a redundant strap-down attitude system which uses three miniaturized gyro sensors linear clusters in the detection unit. The data from the sensors in each of the three clusters are fused by using a Kalman filter, in order to improve the useful angular speed signal measured by the detection unit. In the paper are successively expo...

The paper presents a way to improve the transient regime of a tunnelling accelerometer by using a fuzzy controller to close its loop. The fuzzy controller replaces an electronic amplification and filtering block of proportional-derivative (PD) type, used on the feedback path of the classical architecture. For the proposed controller, proportional-d...

This article presents a new method to obtain a miniaturized intelligent gyro sensor. The proposed method uses a fuzzy logic controller to realize an online correction of the error due to the gyro sensor's bias variation with temperature. In the first phase, gyro experimental testing is performed for various speeds ranging from -150 to 150 /s and te...

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A torque motor is a special electric motor that is able to develop the highest possible torque in a certain volume. A torque motor usually has a pancake configuration, and is directly jointed to a drive system (without a gear box). A limited angle torque motor is a torque motor that has no rotary electromagnetic field - in certain papers it is refe...

In this paper are presented, compared and analyzed two of the most frequently used methods for the ECG signal filtering: the Wavelet denoising method and the Adaptive filtering method. There were highlighted the features, performances and selection capabilities achieved by the filters. For the research efficiency and completeness, over our simulate...

The paper presents an adaptive algorithm for the statistical filtering of the miniaturized inertial sensors noise by building redundant networks of sensors in the same navigator, followed by each sensors network data fusion. The proposed method offers the advantage of having a redundant inertial navigator in terms of the detection unit. The sensors...

The paper presents a fuzzy logic based algorithm to reduce the noise of the miniaturized inertial sensors used in strap-down inertial navigation systems (SDINS) in linear redundant configurations. The algorithm idea is to establish a weight for each sensor from an SDINS axis (measuring acceleration or angular speed) as a function of the standard de...

In this paper we emphasize the main methods of data fusion with potential applications in navigation systems with micro and nano sensors. In the introduction are outlined some basic features of data fusion process. Further the work is structured as it follows: 2) Architectures for sensor data fusion, 3) Models for sensor data fusion; 4) Sensor data...

The paper is a study of the error models for the acceleration sensors used in the strap-down inertial navigation systems. Two categories of errors models, presented in the literature, are described: IEEE standardized models, and un-standardized derived models. Generally the models contains the scale factor error, the asymmetric scale factor error,...