D. Navikas

D. Navikas
Kaunas University of Technology · Department of Electronics Engineering

PhD

About

71
Publications
21,261
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426
Citations
Additional affiliations
February 2012 - present
Kaunas University of Technology
Position
  • Professor

Publications

Publications (71)
Article
Full-text available
Intelligent transportation systems represent innovative solutions for traffic congestion minimization, mobility improvements and safety enhancement. These systems require various inputs about vehicles and traffic state. Vehicle re-identification systems based on video cameras are most popular; however, more strict privacy policy necessitates depers...
Article
Full-text available
This paper focuses on the operational analysis of wireless power transfer (WPT) system, while the topology of the secondary side rectifier represents the main element, for which the properties of WPT system are being investigated. Initially the system description and technical specifications are given. Because WPT systems are designed for a certain...
Article
Full-text available
In Intelligent Transportation Systems the identification and tracking of vehicles play an important role in enhancing traffic management, security, and overall road safety. Traditional means for vehicle re-identification rely solely on video-based systems which are not resilient to harsh environment conditions, suffer from visual obstructions, and...
Article
Full-text available
The growing population and lack of change in resources of cultivated land have led to the search for more efficient farming solutions. The recovery of soil is facilitated by using chemicals designed for the enrichment of cultivated soil. Fertilisers are made of a combination of various substances that determine not only the chemical but also the sh...
Preprint
Full-text available
This paper focuses on the operational analysis of wireless power transfer (WPT) system, while the topology of the secondary side rectifier represents the main element, for which the properties of WPT system are being investigated. Initially the system description and technical specifications are given. Because WPT systems are designed for a certain...
Article
Full-text available
The increasing presence of vehicles on roads necessitates intelligent traffic management solutions in areas where video cameras cannot be utilized. Currently, there are limited choices for depersonalized vehicle reidentification systems. This paper introduces a system that later will be used for vehicle reidentification. The system uses anisotropic...
Article
Full-text available
Magnetic field sensors installed in the road infrastructure can be used for autonomous traffic flow parametrization. Although the main goal of such a measuring system is the recognition of the class of vehicle and classification, velocity is the essential parameter for further calculation and it must be estimated with high reliability. In-field tes...
Article
Full-text available
The optimal water flow in fish breeding tanks is one of the crucial elements necessary for the well-being and proper growth of fish, such as salmon or trout. Considering the round tanks and the uneven distribution of water-flow velocity, ensuring a nearly optimal flow is an important task that may be performed using various sensors installed to mon...
Article
Full-text available
Nonclinical measurements of a seismocardiogram (SCG) can diagnose cardiovascular disease (CVD) at an early stage, when a critical condition has not been reached, and prevents unplanned hospitalization. However, researchers are restricted when it comes to investigating the benefits of SCG signals for moving patients, because the public database does...
Article
Full-text available
This article deals with the treatment and application of cardiac biosignals, an excited accelerometer, and a gyroscope in the prevention of accidents on the road. Previously conducted studies say that the seismocardiogram is a measure of cardiac microvibration signals that allows for detecting rhythms, heart valve opening and closing disorders, and...
Article
Full-text available
Reliable cost-effective traffic monitoring stations are a key component of intelligent transportation systems (ITS). While modern surveillance camera systems provide a high amount of data, due to high installation price or invasion of drivers’ personal privacy, they are not the right technology. Therefore, in this paper we introduce a traffic flow...
Article
Full-text available
Piezoelectric energy harvesters have been extensively researched for use with wireless sensors or low power consumption electronic devices. Most of the piezoelectric energy harvesters cannot generate enough power for potential applications. In this study, we explore the parameters, including gap and proof mass, that can affect the damping of the ca...
Article
Full-text available
In this paper, the near-field radiated susceptibility pre-mapping method is proposed using the improved near-field probe power radiation profile assessment. The modelling of the electromagnetic field strength in 80–3000 MHz range in the proximity of the near-field probe was performed. The -6 dB aperture boundaries of the near-field probe and their...
Article
Full-text available
With rapidly increasing traffic occupancy, intelligent transportation systems (ITSs) are a vital feature for urban areas. This paper analyses methods for estimating long (L > 10 m) vehicle speed and length using a self-developed system, equipped with two anisotropic magneto-resistive (AMR) sensors, and introduces a method for verifying the results....
Conference Paper
Piezoelectric energy harvesters have been extensively researched for use with wireless sensors or low power consumption electronic devices. Most of piezoelectric energy harvesters cannot generate enough power for potential applications. In this study, we explore parameters, including gap and proof mass, that can affect the damping of cantilever to...
Conference Paper
Teaching engineering today is a challenging task due to many issues, mainly the dynamic nature of the subject, the scope of the learning material, and the information overload in lives of students. The expectations of a quality graduate is that not only that he or she will have good fundamental knowledge of the subject, but so called "soft" compete...
Conference Paper
This paper investigates GTEM cell field uniformity and provides TEM mode verification for GTEM 1000 cell in the frequency range from 30 MHz to 1000 MHz. Field uniformity is essential in electromagnetic compatibility immunity tests. Uneven field distribution might lead to test mistakes and decrease measurement accuracy. Verification of TEM mode and...
Conference Paper
In this paper, the improved near-field probe power radiation profile investigated. The modelling of the electromagnetic field strength in 80-3000 MHz frequency range in the proximity of the near-field probe was performed. The-6 dB aperture boundaries of the magnetic near-field probe were determined for adaptive scanning height systems in the distan...
Article
Full-text available
Growing population and decreasing amount of cultivated land conditions the increase of fertilizer demand. With the advancements of computerized equipment, more complex methods can be used for solving complex mathematical problems. In the fertilizer industry, the granulometric composition of products matters as much as the quality of production of c...
Article
Full-text available
Seeking an effective method for estimating the speed and length of a car is still a challenge for engineers and scientists who work on intelligent transportation systems. This paper focuses on a self-developed system equipped with four anisotropic magneto-resistive (AMR) sensors which are placed on a road lane. The piezoelectric polyvinylidene fluo...
Article
Full-text available
Fertilizer manufacturing in the chemical industry is closely related with agricultural production. More than a half of raw materials for food products are grown by fertilizing plants. The demand of fertilizers has been constantly increasing along the growth of human population. Fertilizer manufacturers face millions of losses each year due to poor...
Article
Full-text available
In this paper, the Internet of Vehicles approach is used to develop a novel low cost sensor based system for road safety applications in intelligent transportation systems. It was found that major hazards that compromise road safety include weather related factors, poor road surfaces and presence of sharp turns. A wireless sensor network based solu...
Article
Cross-correlation is an accurate method which can be used to find time shift between two signals. However, this method necessitates a high usage of microcontroller (MCU) resources. This situation occurs in a microprocessor system dedicated to evaluate speed values of cars driving on roads. Cross-correlation and the other computational methods aimin...
Article
Full-text available
The proper operation of computing resources in a microprocessor-embedded system plays a key role in reducing computing time. Processing the variable amount of collected data in real-time improves the performance of a microprocessor-embedded system. In this regard, a vehicle’s speed measurement system is no exception. The computing time for evaluati...
Article
This paper presents technologies and experiments of a wireless sensors using two thermocouples network. It was established that the energy consumption during sensor measurements is usually up to 10 times lower compared to the energy consumption at the time of establishing wireless connection for most protocols. For this reason, new simplified wirel...
Article
Full-text available
This article explores a non-invasive method to determine interstitial fluid level and pressure in tissue. Interdigital electrodes were chosen by simulated results in software “Comsol multiphysis 4.3a”. Environment model similar to human body was created. Measurements were carried out at different situations which can occur during preoperative and a...
Article
Full-text available
This paper presents techniques for initial design and quick fundamental and harmonic operation analysis of surface acoustic waves ultra-wideband hyperbolically frequency modulated (HFM) interdigital transducer (IDT). The primary analysis is based on the quasi-static method. Quasi-electrostatic charge's density distribution was approximated by Cheby...
Article
Full-text available
Methods for estimating a car's length are presented in this paper, as well as the results achieved by using a self-designed system equipped with two anisotropic magneto-resistive (AMR) sensors, which were placed on a road lane. The purpose of the research was to compare the lengths of mid-size cars, i.e., family cars (hatchbacks), saloons (sedans),...
Conference Paper
The computer vision systems are mainly devoted for production monitoring in quality inspection systems. It is the fastest growing and most popular non-invasive product defects detection method. The productivity of electronic components growth and their prices decline creates favorable conditions for the development of image processing systems for i...
Article
Full-text available
A mini volume loading test (mVLT) method is used for decision making in our prototype semi-closed loop infusion system (SCLIS). The mVLT fluid protocol consists of hemodilution response-guided mini fluid challenges. Each mini fluid challenge (MFC) consists of a 2.5 ml kg-1.5 ml kg-1 crystalloid bolus infused over 2 min.5 min and followed by a 5 min...
Article
Full-text available
The vehicle detection process plays the key role in determining the success of intelligent transport management system solutions. The measurement of distortions of the Earth’s magnetic field using magnetic field sensors served as the basis for designing a solution aimed at vehicle detection. In accordance with the results obtained from research int...
Article
The road transport of dangerous goods (RTDG) arouses more and more attentions in recent years. Vehicle location devices only based on GPS technology have played an important role on the current market. However, there are obvious shortcomings by using a simple GPS method in the aspect of positioning accuracy and coverage. In the blind area of GPS, a...
Article
Full-text available
An In Silico testing of our novel automated clinical decision support system (ACDSS) in a prototype semi-closed loop (SCL) infusion system was previously reported. The decision making therein is based on the evaluation of hemodynamic and hemodilution parameters in compliance with an algorithm that implies interchangeable application of fluid infusi...
Article
Full-text available
Goal directed fluid therapy (GDFT) implies the flow-related parameters guided infusion of fluids. It requires adherence to complex clinical algorithms and fluid protocols, as well as simultaneous monitoring of several parameters and evaluation of their fluid responsiveness or actual response to fluid challenges. Automated clinical decision support...
Article
The road transport of dangerous goods (RTDG) arouses more and more attentions in recent years. Vehicle location devices only based on GPS technology have played an important role on the current market. However, there are obvious shortcomings by using a simple GPS method in the aspect of positioning accuracy and coverage. In the blind area of GPS, a...
Conference Paper
Deaths from high blood pressure account for nearly thirteen percent of all deaths in the world population. Elevated blood pressure is a sign that radical changes in life are needed. People need to know why there is an increase in blood pressure and to take measures to monitor and control it. The paper analysed the invasive and non-invasive blood pr...
Article
Full-text available
This article deals with a method of vehicle detection in a parking space by measuring the Earth's magnetic field alteration. The magnetic field measurements were performed by the means of three axis anisotropic magneto-resistive magnetic field sensors. Research was performed on how to detect a vehicle in a parking space even when the vehicle enters...
Article
Full-text available
Anisotropic magneto-resistive sensors (hereinafter - AMR) react to the Earth's and vehicles' magnetic field, whereas variation disturbances of magnetic field allow detecting the vehicles in the parking space. Having known exactly how the magnetic field varies in the parking space and having measured it with sensor LSM303DLH AMR, an assumption can b...
Article
Due to its simplicity and efficiency peristaltic drips [1] are widely used in a wide variety of treatments in medical practice [2]. Drip sensors used along with the drips provide step-infusion of medications and reduce the influence of the human factor. Infusion rate of medication plays one of the key roles in the treatment process [3], [4], so it...
Article
Full-text available
Closed loop systems are the ultimate solution to ensure that optimal therapies are delivered in a timely manner. A concept of a semi-closed loop infusion system for perioperative semi-automated optimisation of blood pressure and haemodilution is proposed. The key variable for the latter objective is the noninvasively and continuously measured blood...
Article
Full-text available
This article explores a possibility to determine blood glucose level in a non-invasive way. Environment similar to human body was simulated in software "Comsol Multiphysics 4.3a" and most suitable topology of interdigital electrodes was chosen. These electrodes were used to carry out investigation of blood glucose levels in several test subjects. N...
Article
Full-text available
The article covers analysis of magnetic field sensor LSM303DLH with auxiliary components (R, C). A pair of Helmholtz coils were designed and examined. Experimental equipment able to create magnetic field of magnitude up to 1000G was produced. Research determined that residual offset in measurement of magnetic field is observed at magnitudes of exte...
Article
Full-text available
Light emitting diodes have many positive features comparing with incandescent and fluorescent lamps like its small size; high luminous efficiency, long lifetime and reliability. That features increases the popularity of LEDs using in lighting. However there are many cheap, non-certified light emitting diodes bulbs in the market, where the parameter...
Article
Full-text available
During geological soil examination humidity of the soil was decided to be measured using interdigital capacitance sensors. Using software "COMSOL v4.2" the sensors were modelled and optimal sizes for use with AD 5933/34 chip were selected. Electrical impedance has proven to be the most suitable parameter for humidity measurement. Optimal probing fr...
Article
Full-text available
Typical risk reduction measures are not sufficient to reduce the probability of errors resulting from operator mistakes. Improvement of the device software and hardware, adding more alerts and alarms is not enough to significantly reduce the risk of such type of hazards, so there is a need of new methods to improve the safety of medical devices. On...
Article
Full-text available
This paper presents a model of stereo vision system for intelligent vehicles to avoid forward car collision. Approached vehicle extraction and distance estimation algorithm based on dense edge map calculation and ROI filter. Primary experiments have been executed modeling vision system in a virtual computer reality. Special developed software has b...
Article
Full-text available
While designing embedded systems with magnetic resistance sensors, the influence of components inducted magnetic field should be estimated. The modeling of inductor, power and RS485 lines was performed using COMSOL. The modeling results allow set minimal distances between investigated components and AMR sensor. The modeling results were experimenta...
Article
Full-text available
There are presented experimental research results of AMR sensors (Honeywell HMC1022, MEMSIC MMC314xMS and STMicroelectronics LSM303DLH) thermo-stability. The experiment results show that not all sensors have temperature characteristics that are declared by manufacturer. Adaptive thermo-compensation algorithm pas proposed. Proposed method avoids nee...
Article
Full-text available
Abstract – Cone penetration testing (CPT) is a fast and reliable means for exploring soils and soft ground (to 40 m depth) for support of buildings, retaining walls, pavement subgrades, and bridge foundations. A cone can deviate from verticality due to misalignment, a bent push rods, soil layering, or by being pushed off a vertical course during pe...
Article
Here is presented a temperature compensation technique of cone penetration probe sensors (CPT). Probe internal temperature influence to accuracy of ADC and sensors bridge output voltage was investigated. There are presented theoretical results of bridge calibration and strain measure errors.
Article
Full-text available
In most cases when developing biotronics systems (BTS) it falls to seek maximum efficiency of these systems, despite the required input of material ant time resources. Several methods applicable when improving the efficiency of hazardous BT technologies (HT) were discussed. It was proved, that HT efficiency depends on the modularity or these techno...
Conference Paper
Full-text available
There is presented patient risk management aspects using syringe infusion pump (SIP) infusion management system. System hardware and software influence to patient risk is estimated. There are presented experiment results of IrDA channel reliability. Reliability assurance using CRC, data string inversion and data transfer repeat aspects were investi...
Article
Full-text available
There are analyzed properties of syringe infusion pumps (SIP) control system user interface that allows reducing patient risk during the infusion. Also there are analysed main reasons of SIP security problems for the patient. Patient risk variation evaluation method according to statistical SIP reliability and personel human mistake factor during t...
Conference Paper
Full-text available
Functional and hardware structures of integrated syringe pumps control system (ISPCS) are presented. ISPCS efficiency evaluation in consideration of economic factors is analyzed. Necessity of such system is analyzed and motivated. Operator errors and error reduction possibilities using ISPCS are considered. Main features of integrated syringe pumps...
Article
Full-text available
Approximation of magnetic field of deflection system using power polynomials and approximation influence on electron trajectories modeling accuracy is analyzed here. For investigation analytically calculated single-wire deflection system and measured real deflection system magnetic fields are used. Approximation of these fields by 3(rd) and 5(th) o...
Article
Algorithm and program was created in MATLAB environment by using splines and which is intended for interpolation of electric field potential created by electronic optical system (EOS). Initial electric potential distribution may be known at the nodes of regular or irregular coordinate mesh and potential values can be found at any selected point of...
Article
Full-text available
Principles of electronic optical system (EOS) modeling using finite element method are presented. Modeling precision dependence on finite element mesh density is investigated. Modeling precision of electric field potential created by EOS is analyzed by calculating electron trajectories and scattering of their traces on the screen
Conference Paper
Using finite element method, model of design of electronic optical system was made. Libraries of electronic optical system components and presumable electron trajectories were made. Analysis of finite element mesh creation was completed and finite element mesh spacing was determined in the zones of presumable electron trajectories. There are presen...
Conference Paper
This paper presents the concept of electronic device persistence. The main electronic system features that determine persistence are singled out. In addition, the paper shows how to estimate some indexes of these features.
Article
Full-text available
There is shown diff erence between digital electronic device no-f ailure traditional calculation and exploitation results. There are signed out two areas of dynamic actions inf luence: ability of digital electronic device f unctioning and information distortion. The conception of dynamic reliability and main trend of research are formulated. Three...
Article
Full-text available
There are presented two color TV-tube shadow mask surface modeling methods. Technique offered in this work is based on electron trajectory modeling in measured or modeled electric and magnetic fields, created by developed TV-tube. In order to reduce calculation duration electron trajectories deflection centers coordinates are approximated using pow...
Article
Full-text available
Quality of color gamut reproduced by color TV-tubes with planar electronic-optical system (EOS) strongly depends on geometrical parameters of shadow mask surface slit, which are typically found during empirical experiments. Such method requires lots of expenses and lasts for a long time. Technique offered in this work is based on electron trajector...

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