Igor Hut | University of Belgrade, Faculty of Mechanical Engineering (original) (raw)

Papers by Igor Hut

Energy and Buildings, 2016

Detection of specific terrain features and vegetation, referenced as a landscape classification, ... more Detection of specific terrain features and vegetation, referenced as a landscape classification, is an important component in the management and planning of natural resources. The different land types, man-made materials in natural backgrounds and vegetation cultures can be distinguished by their reflectance. Although remote sensing technology has great potential for acquisition of detailed and accurate information of landscape regions, the determination of land-use data with high accuracy is generally limited by the availability of adequate remote sensing data, in terms of spatial and temporal resolution, and digital image analysis techniques. Therefore, remote sensing with multi-spectral or/and hyperspectral data derived from various satellites in combination with topographic variables is a valuable tool in landscape type classification. The different methods based on reflectance data from multi-spectral Landsat satellite image sets are used for automatic landscape type recognition. In order to characterize reflectance of landscape types represented in an image, construction of a multi-spectral descriptor, as a vector of acquired reflectance values by wavelength bands, is proposed. The applied algorithms for landscape type classification (artificial neural network, support vector machines and logistic regression) have been analysed and results are compared and discussed in terms of accuracy and time of execution.

Contemporary Materials

In order to further investigate performance of Optomagnetic Imaging Spectroscopy in cervical canc... more In order to further investigate performance of Optomagnetic Imaging Spectroscopy in cervical cancer detection, deep learning algorithm has been used for classification of optomagnetic spectra of the samples. Optomagnetic spectra reflect cell properties and based on those properties it is possible to differentiate normal cells from cells showing different levels of dysplasia and cancer cells. In one of the previous research, Optomagnetic imaging spectroscopy has demonstrated high percentages of accuracy, sensitivity and specificity in cervical cancer detection, particularly in the case of binary classification. Somewhat lower accuracy percentages were obtained in the case of four class classification. Compared to the results obtained by conventional machine learning classification algorithms, proposed deep learning algorithm achieves similar accuracy results (80%), greater sensitivity (83.3%), and comparable specificity percentages (78%).

Contemporary Materials

Cervical cancer screening with Papanicolaou test and liquid based cytology relies on the expertis... more Cervical cancer screening with Papanicolaou test and liquid based cytology relies on the expertise of the pathologist. Liquid based cytology is proven to be more efficient than conventional Papanicolaou test when it comes to sample preparation and possibility of conducting several tests on the same sample. However, specificity and sensitivity of the test are in the range of the Papanicolaou test accuracy metrics, with false negative results still being the main drawback of these manually performed tests. Advances in technology and availability of digital data have enabled succesfull application of machine learning models in diagnostics. Images of cervical cells are now used as input to different deep learning models currently tested in studies concerning computer aided diagnostic systems. This study explores different architectures of convolutional neural network for cervical cancer detection based on Optomagnetic imaging spectroscopy and liquid based cytology samples. The proposed ...

Beograd : Mašinski fakultet Univerziteta u Beogradu; Akademska misao, 2015

MATLAB i LabVIEW su popularna razvojna programska okruženja koja su proizvod američnih kompanija ... more MATLAB i LabVIEW su popularna razvojna programska okruženja koja su proizvod američnih kompanija MathWorks (Natick, MA, USA) i National Instruments (Austin, TX, USA), a danas se koriste na skoro svim svetskim univerzitetima i u najvećem broju inženjerskih istraživačkih ustanova. Zajednička karakteristika za MATLAB i LabVIEW je user‐friendly pristup, koji omogućava čak i korisnicima sa ograničenim iskustvom u programiranju da pišu programe i testiraju rešenja značajno brže nego što je to slučaj sa konvencionalnim programskim alatima. MATLAB (MATrix LABoratory) je programsko okruženje specijalizovano za numeričke proračune primenom posebno prilagođenog sekvencijalnog kôda. LabVIEW (Laboratory Virtual Instrument Engineering Workbench) se bazira na programiranju pomoću G kôda, koji se realizuje grafičkim slaganjem i povezivanjem blokova koji izvršavaju delove kôda. Studenti, inženjeri i naučnici širom sveta koriste oba okruženja u različitim fazama dizajna, modeliranja, simulacija, testiranja prototipa i razvoja novih tehnologija. MATLAB se najčešće koristi za simulacije i kompleksne numeričke proračune zbog velikog broja pridruženih biblioteka koje sadrže složene funkcije specijalizovane za primenu u različitim oblastima tehnike. LabVIEW je najčešći izbor u slučaju potrebe za intuitivnim i nešto kompleksnijim korisničkim interfejsom za kontrolu programa i posmatranje rezultata, kao i u slučaju interakcije sa hardverom (akvizicija tj. merenje ili generisanje signala za upravljanje eksternim uređajima). Iskusni korisnici se često odlučuju da kombinuju MATLAB i LabVIEW. Podaci iz jednog programa mogu biti eksportovani u drugi program radi dalje obrade, dok LabVIEW čak omogućava implementaciju postojećeg MATLAB kôda u okviru MathScript Function modula. Ova knjiga će vam pomoći da zakoračite u svet programiranja u okruženjima MATLAB i LabVIEW uz niz korisnih saveta i rešenih primera. Primeri su pažnjivo birani iz domena biomedicinskog inženjerstva, ali tako da čitaoca upoznaju sa osnovnim tehnikama programiranja koje se mogu lako primeniti i u drugim domenima inženjerstva

The results of mechanical properties and fatigue crack propagation tests, performed with high str... more The results of mechanical properties and fatigue crack propagation tests, performed with high strength 8090 Al-Li alloy, are presented in this paper. High level of strength properties is accompanied with acceptable level of fatigue threshold values, offering an alloy of superior characteristics in application, compared to other high strength aluminium alloys. The obtained results of tensile tests and fatigue crack propagation values, are discussed and compared for underage and peak-aged tempers in T-L and L-T orientation of 10 mm thick plates. Keywords: Al-Li 8090 alloy, crack growth rate, fatigue threshold 1. INTRODUCTION In recent years lithium-containing aluminium alloys have been introduced because of their superior mechanical properties such as combination of high stiffness and high strength with low density and potentially low unit cost. Due to their high strength-to-weight ratio lithium-containing aluminium alloys attract the attention of designers, producers and users of air...

Biomaterials in Clinical Practice, 2017

Polymeric biomaterials represent large and very adaptable class of biomaterials, which makes them... more Polymeric biomaterials represent large and very adaptable class of biomaterials, which makes them very suitable for diversity of biomedical applications. Polymers can be synthesized to have a variety of structures and suitable chemical, physical, biomimetic and surface properties. An overabundance of polymeric biomaterials with different compositions and physicochemical properties have already been developed and investigated; however, there are still many active studies about these materials. This chapter ensures a structural review of biodegradable polymers and discusses their physicochemical characteristics, structure property, applications and limitations in medicine. It is the authors’ intent to provide an insight over the available synthetic and natural polymer classes. Some types of polymer materials are less discussed than the other more relevant. A biocompatible, degradable polymer, polylactic acid is very popular so called green ‘eco-friendly’ material with a most promising development prospect. Besides biocompatibility and biodegradability, natural polymer, chitosan, possess outstanding properties. Hydrogels are super absorbent polymeric materials with one of the main role in health care. For these biopolymers, reviews are referenced to present guidance for further reading.

Contemporary Materials, 2013

Nanotechnology is a common word these days, although only 15 years ago it was a quite obscure ter... more Nanotechnology is a common word these days, although only 15 years ago it was a quite obscure term used almost exclusively in scientific community. It is a fact that nanotechnology is widely present today with numerous applications, especially regarding novel materials. This is a technology that draws a lot of attention not only in the scientific community but also among investors, governments and industry. There is a great deal of expectations connected with it and especially, amongst others, concerning sustainable energy production. This paper briefly explores some of possible implementations of nanotechnology for new and improved energy conversion methods, considering a need for this to be done without doing harm to our environment. Focus is placed on advanced photovoltaic and hydrogen production technology.

Commercialization of Nanotechnologies–A Case Study Approach, 2017

Nano-engineered materials are playing an ever growing role in the rapidly developing field of sus... more Nano-engineered materials are playing an ever growing role in the rapidly developing field of sustainable energy production. Besides providing numerous opportunities for innovations in this domain, utilisation of nanostructured materials raises numerous doubts regarding their impact on the environment and possible adverse effects on human health. Providing reliable methods for analysis, evaluation and dealing with the environmental and health effects of nanotechnology is therefore crucial. In this article we will try to give an outline of possible approaches to deployment of Life Cycle Assessment (LCA) tools to nanomaterials used in certain applications for sustainable energy production. Use of such methods should also provide the possibility of comparing these new, emerging, technologies with that of already existing conventional ones in terms of their environmental, health and safety impacts.

Contemporary Materials, 2016

We have investigated transport properties of higher acenes pentacene and hexacene and compared it... more We have investigated transport properties of higher acenes pentacene and hexacene and compared it with the transport properties of their BN analogues. Charge hopping from one structure to another was investigated through calculations of reorganization energies based on DFT and Marcus semiempiric approach, while the investigation of charge transport along the investigated structures was based on DFT calculations and non-equilibrium Green's function (NEGF) method. Attention was also paid to the energy separation between the lowest excited singlet (S1) and triplet (T1) state, which is quantity that is important for the field of thermally activated delayed fluorescence (TADF). The obtained results indicate that both groups of investigated structures have certain advantages and drawbacks. According to the reorganization energies and I-V characteristics, pentacene and hexacene have better properties, while from the aspect of TADF, BN analogues of pentacene and hexacene have better pro...

There are a lot of cosmetic products on the market based on nanotechnology. Those products contai... more There are a lot of cosmetic products on the market based on nanotechnology. Those products contain nanomaterials since they have many advantages such as improved delivery of active ingredients, stability and photostability of potentially unstable cosmetic ingredients, increased efficacy and tolerance of the skin for various UV filters. Nanomaterials contribute to easiness of application and aesthetic appearance of final products. Although they offer many possibilities, their use demands caution. Nanoparticles have a large surface to volume ratio leading to their reactivity and alteration in biological activity compared to the parent bulk materials. The shape and size of the particles are the cause if their toxic effects, rather than their chemical properties. There are various nanosystems currently in use, in pharmaceutical and cosmetic industry, and many new ones, waiting to be applied. In this article we are going to introduce those who find an application in personal care product...

Biomaterials in Clinical Practice, 2017

The hip joint is one of the largest joints in the body and is a major weight-bearing joint. The f... more The hip joint is one of the largest joints in the body and is a major weight-bearing joint. The function of the hip is to withstand body weight during standing and walking; during single leg stance the hip joint must carry a load three times greater the body weight. However, Joint degeneration is the final phase of the joint cartilage destruction, leading to severe pain, loss of mobility, and sometimes even angular deformity of the limbs. The primary reasons for a large number of total hip replacements are osteoarthritis and osteoporosis of the femoral neck, which often leads to hip fractures. One of the most successful techniques to restore function of a degenerated joint is the total joint replacement. In this surgical procedure, diseased cartilage and parts of the bone are removed and replaced with an appropriate joint prosthesis. Several types of materials and techniques have been developed for this purpose: glass, polymer, metal alloy, ceramics, etc. Earliest prosthesis designs and biomaterials that have been developed to treat osteoarthritic hip degenerated joint surfaces were for the most part empirical and unsuccessful. Joint replacement heralded a revolution after the materials and replacement procedures developed by Sir John Charnley. A modern total hip prosthesis consists of a femoral and acetabular component, where the femoral head is made of cobalt-chrome alloy, alumina or zirconium, and the stem component is now usually made of Ti- or Co-Cr-based alloy. The search for improved designs and new hip implant biomaterials with better biocompatibility and more desirable mechanical properties is still underway.

Zastita materijala, 2015

The use of nanotechnology to develop a suite of sustainable energy production schemes is one of t... more The use of nanotechnology to develop a suite of sustainable energy production schemes is one of the most important scientific challenges of the 21st century. The challenge is to design, to synthesize, and to characterize new functional nanomaterials with controllable sizes, shapes, and/or structures. Nanotechnology is generating a lot of attention these days and therefore building great expectations not only in the academic community but also among investors, the governments, and industry. This paper, explores some of the possible implementations of nanotechnology for new and improved methods of energy conversion, considering a need for this to be done without compromising our environment. Its unique capability to fabricate new structures at atomic scale has already produced novel materials and devices with great potential applications in a wide number of fields. Focus is given to important role of nanomaterials, preparation and characterization some of nanomaterials important for sustainable energy, dye sensitized solar cels and hydrogen production technology.

2011 15th IEEE International Conference on Intelligent Engineering Systems, 2011

In this paper is presented an example of experimental analysis of biomaterials based on optical m... more In this paper is presented an example of experimental analysis of biomaterials based on optical measurement methodology. GOM optical system and Aramis software were used to perform 3D experimental optical analysis of titanium alloys for biomedical applications. The possibilities of using this method for analyzing materials for biomedical applications are discussed, and having in mind that the system used in

Advanced Materials Research, 2013

Magnetic Force Microscopy (MFM) and Opto-Magnetic Spectroscopy (OMS) were used to characterize HT... more Magnetic Force Microscopy (MFM) and Opto-Magnetic Spectroscopy (OMS) were used to characterize HTCV stainless steel and aluminum. Both materials were immersed in 1.0M HCl and 1.0M CH3COOH solutions for two hours. From the OMS method it was discovered that treated materials showed differences in peak wavelengths. Topographical and magnetic features for steel plate samples showed better resistance to an aggressive medium compared to aluminum. The results and analysis of these investigations are compared and presented in this paper.

Contemporary Materials, 2013

In this paper the comparative studies were conducted of the surface areas of nanophotonic contact... more In this paper the comparative studies were conducted of the surface areas of nanophotonic contact lens and contact lens made from base material, measured by Nanoprobe Atomic Force Microscope. Nanoprobe atomic force microscopy (AFM) provides information on the size structure on nano scale level, the form of recorded structures (cavities), their distribution of the surface, and the total roughness of the scanned area. The atomic force microscope used in this study is a SPM-5200 of JEOL, Japan. AFM consists of a cantilever with a sharp tip (probe) at its end that is used to scan the specimen surface. Images of the specimen surface are created by measuring the deflection of the cantilever. The cantilever used in this study is produced by MikroMasch (Estonia) by trade name NCS18/Co-Cr. This AFM probe is silicon etched probe tip that has conical shape. It is coated with Co and Cr layers. Images of surface topography were obtained for each type of contact lenses. The base material of contact lens was made from PMMA and the nanophotonic contact lens was made of fullerene doped PMMA. Fullerenes were used because of their good transitive characteristics in ultraviolet, visible and near infrared light spectrums. Measurements were done at room temperature. Results of topography for both materials are presented and compared.

FME Transaction, 2014

To obtain new knowledge about structure of liquid water and interaction between constituents in w... more To obtain new knowledge about structure of liquid water and interaction between constituents in water and water molecules a new approach has been attempted using Opto-magnetic imaging spectroscopy (OMIS), a method based on a light-matter interaction. Opto-magnetic imaging spectroscopy is a novel method which takes into account a ratio of electrical and magnetic forces of chemical bonds, and therefore collects data of both classical and quantum actions of water molecules and other constituents. Here, we used OMIS combined with techniques of multivariate analysis and neural networks to extract data from spectra of different waters. We have investigated this method for characterization and discrimination of different waters with special interest in para-diamagnetic properties which can give clues about organization of water molecules. It is shown that the use of OMIS together with multivariate techniques and neural networks approach can be proved as a valuable asset in characterizing water from the aspect of its structural organization.

Stomatoloski glasnik Srbije, 2012

Emerging technologies and new nanoscale information have potential to transform dental practice b... more Emerging technologies and new nanoscale information have potential to transform dental practice by improving all aspects of diagnostics and therapy. Nanocharacterization allows understanding of oral diseases at molecular and cellular levels which eventually can increase the success of prevention and treatment. Opto-magnetic spectroscopy (OMS) is a promising new technique based on light-matter interaction which allows insight into the quantum state of matter. Since biomolecules and tissues are usually paramagnetic or diamagnetic materials it is possible to determine the dynamics of para-and diamagnetism at different teeth structures using that method. The topography of the surface of a sample can be obtained with a very high resolution using atomic force microscopy (AFM), which allows observation of minimal changes up to 10 nm, while magnetic force microscopy (MFM) is used to record the magnetic field gradient and its distribution over the surface of a sample. The aim of this study w...

Contemporary Materials, 2015

Nano-engineered materials are playing an ever growing role in the rapidly developing field of sus... more Nano-engineered materials are playing an ever growing role in the rapidly developing field of sustainable energy production. Besides providing numerous opportuni-ties for innovations in this domain, utilisation of nanostructured materials raises numerous doubts regarding their impact on the environment and possible adverse effects on human health. Providing reliable methods for analysis, evaluation and dealing with the environ-mental and health effects of nanotechnology is therefore crucial. In this article we will try to give an outline of possible approaches to deployment of Life Cycle Assessment (LCA) tools to nanomaterials used in certain applications for sustainable energy production. Use of such methods should also provide the possibility of comparing these new, emerging, technologies with that of already existing conventional ones in terms of their environmental, health and safety impacts.

Energy and Buildings, 2016

Contemporary Materials

Beograd : Mašinski fakultet Univerziteta u Beogradu; Akademska misao, 2015

Biomaterials in Clinical Practice, 2017

Contemporary Materials, 2013

Commercialization of Nanotechnologies–A Case Study Approach, 2017

Contemporary Materials, 2016

Biomaterials in Clinical Practice, 2017

Zastita materijala, 2015

2011 15th IEEE International Conference on Intelligent Engineering Systems, 2011

Advanced Materials Research, 2013

Contemporary Materials, 2013

FME Transaction, 2014

Stomatoloski glasnik Srbije, 2012

Contemporary Materials, 2015

Nano-engineered materials are playing an ever growing role in the rapidly developing field of sus... more Nano-engineered materials are playing an ever growing role in the rapidly developing field of sustainable energy production. Besides providing numerous opportuni-ties for innovations in this domain, utilisation of nanostructured materials raises numerous doubts regarding their impact on the environment and possible adverse effects on human health. Providing reliable methods for analysis, evaluation and dealing with the environ-mental and health effects of nanotechnology is therefore crucial. In this article we will try to give an outline of possible approaches to deployment of Life Cycle Assessment (LCA) tools to nanomaterials used in certain applications for sustainable energy production. Use of such methods should also provide the possibility of comparing these new, emerging, technologies with that of already existing conventional ones in terms of their environmental, health and safety impacts.