Vlatko CingoskiGoce Delcev University of Štip · Faculty of Electrical Engineering
Vlatko Cingoski
Doctor of Engineering
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88
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659
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Citations since 2017
Introduction
Additional affiliations
December 2012 - December 2016
April 1996 - March 1999
April 1993 - March 1996
Publications
Publications (88)
In the paper are presents the results of a practically realized on process Smart Power meter. The application is intended for data collection for the voltage, the current in processing plants. By processing them, data on power, energy, frequency and power factor are obtained. These quantities are visualized on an LCD display, stored in an excel log...
![Figure 1: Distribution of Earth's water Source: [11].](profile/Biljana-Petrevska/publication/354128566/figure/fig1/AS:1061152939335680@1630009984217/Distribution-of-Earths-water-Source-11_Q320.jpg)
![Figure 2: Geothermal temperature gradient Source: [6].](profile/Biljana-Petrevska/publication/354128566/figure/fig2/AS:1061152939339776@1630009984268/Geothermal-temperature-gradient-Source-6_Q320.jpg)
Rooftop photovoltaic (PV) power plants, which have grown in popularity in recent years, might soon generate over 25% of Europe's renewable energy. They might substantially contribute to sustainable electricity generation on small family structures, as well as medium and large-scale commercial buildings, due to several advantageous preconditions. Th...
Being consecutively ranked as one of the most polluted cities in the world, Skopje, the capital of Macedonia, serves as a suitable ground for introducing new, environmentally friendly public transport. The paper argues the justification of utilization of a monorail as technologically and operationally sound long-term sustainable transportation syst...
Many countries face environmental problems along with traffic jams, over-crowded traffic and poor public transportation system. The paper elaborates a project idea of introducing a new sustainable city transport in the capital of Macedonia, based on light and electricity driven monorail system. Yet, the research does not attempt to provide a detail...
Skopje, the capital of Macedonia recently has been enlisted as one of the most air polluted cities in the World. A large portion of this huge pollution came from traffic, unorganized and unbalanced public transportation system currently based on diesel buses. In this paper, the authors propose a new, long-term sustainable public transportation syst...
The study is focused on presenting some insights into the use of energy in the hotel industry in Macedonia. It aims at providing an assessment of managerial perception of energy resources and discussed more environmentally compatible and sustainable alternatives. The data were collected by means of an online survey conducted among hotel managers an...
Tourism is heavily affected by and contributes to negative impacts on the environment. Despite the effort of the accommodation sector to introduce many practices that enable environmental protection, it is still a profound factor that contributes to environmental footprint of tourism. The paper investigates the application of the environmental mana...
The boom of the tourism industry has led to a huge interest in investing largely in hotel lodgings. Tourists have become aware and started considering new and far from ordinary tourist issues, like environmental protection, waste treatment measures, energy efficiency, renewable energy, green-house gas emissions, etc. The aims of the study are three...
We have previously been proposed a novel adaptive finite-element method (FEM) based on a magnetic field conservation indicator and a non-conforming mesh-refinement technique. However, we have applied to a very simple model consisting of a single permanent magnet for basic verification of the proposed method. In this paper, we have improved an error...
Tourism is a fast growing business therefore developing a national brand can be part of an effective strategy in managing national growth in tourism. A positive national image is an essential ingredient for promotion that raises the issue for necessity of investing into national branding as part of the image-building strategy. The article draws on...
An immersive real-time visualization system of 3D magnetic field for educational purposes is presented. This immersive visualization system is based on augmented reality technology. The proposed system provides observation of a magnetic field distribution and its stereoscopic vision in 3D space using head mounted display. To improve the visualizati...
Mesh quality strongly affects the solution accuracy in electromagnetic finite element analysis. Hence, the realization of adequate mesh generation becomes a very important task. Several adaptive meshing methods for automatic adjustments of the mesh density in accordance with the shape and complexity of the analyzed problem, have been proposed. Howe...
Second-generation high-temperature superconducting (HTS) tapes have been examined for applications, such as NMR, MRI, and accelerators. Each of these applications requires a precise magnetic field profile. However, screening currents induced while charging an HTS magnet degrade its magnetic field quality. Techniques to reduce the screening current...
This paper provides information on the extent how the hotel industry in Ohrid meets the energy efficiency practices in terms of the current level of involvement. By undertaking an online survey in three, four and five-star hotels, the study assesses the attitudes and willingness of hotel managers concerning applying energy efficiency and environmen...
In this paper, a visualization system of immersion into 3D magnetic field based on the augmented reality technology using a head mounted display, for education purpose, is presented. By utilizing the proposed visualization method, a user can easily observe and perceive in real-time a magnetic field distribution generated by single/multiple sources...
Mesh quality strongly affects the solution accuracy in electromagnetic finite element analysis (FEA). Hence, the realization of adequate mesh generation becomes a very important task. Although highly experienced users with sufficient knowledge of the electromagnetic phenomenon could easily resolve this problem, to aid in these matters especially fo...
An adaptive meshing method based on element error estimation followed by suitable mesh refinement is a promising methodology for high-quality electromagnetic FEA. However, achieving suitable mesh refinement process is a hard and labor task, because very often during re-meshing process, an undesired flat-shape elements could be generated which stron...
This paper provides information on the extent how the hotel industry in Ohrid meets the energy efficiency practices in terms of the current level of involvement. By undertaking an online survey in three, four and five-star hotels, the study assesses the attitudes and willingness of hotel managers concerning applying energy efficiency and environmen...
This study aimed to investigate the nature of energy applied in hotel industry in Macedonia. It explored the indicators for resources application in three, four and five star hotels. The data were collected by means of an online survey conducted among 45 managers and department supervisors. It is found that large number of hotels lack measures to r...
Contemporary tourists are fully aware of numerous environmental concerns the tourism development is facing with, so they have shifted their accommodation preferences towards eco-friendly hotel establishments. They prefer green products and are willing to pay for “green” services. They expect an environmentally responsible hotel to meet their enviro...
Abstract: This paper presents performances of two different types of PV cells under various temperature clime of Stip, R. Macedonia.
Stip with geographical position 41 .742N, 22.1 94E has 2260 sun hours yearly with average temperature 25 °C during spring.
The types of cells examined in this study are: crystalline silicone (c-Si) and polycrystalline...
This paper presents performances of two different types of PV cells under various temperature clime of Stip, R. Macedonia.
Stip with geographical position 41 .742N, 22.1 94E has 2260 sun hours yearly with average temperature 25 °C during spring.
The types of cells examined in this study are: crystalline silicone (c-Si) and polycrystalline silicon (...
This paper gives an overview of a potential path that new hotels have to satisfy to improve their status from a hotel with smart rooms towards a full-scale smart hotel facility. It presents a possible transitional way including innovative applications based on modern information technology for ambient settings in the domain of hotel industry that a...
Contemporary tourists are fully aware of numerous environmental concerns the tourism development is facing with, so they have shifted their accommodation preferences towards eco-friendly hotel establishments. They prefer green products and are willing to pay for “green” services. They expect an environmentally responsible hotel to meet their enviro...
Hotels consume substantial quantity of energy, water and other non-durable products, thus provoking significant environmental impacts. On the other hand, they rely on clean nature and unpolluted environment as a core value for hotel industry. Tourists more often abandon tourism destinations in poor environmental condition and trace for hotels with...
The paper assesses the application of the concept of environmental protection and energy efficiency in hotel industry, by elaborating the case of Macedonia. It investigates the extent of environmental protection practices in terms of current level of involvement. For that purpose, the research was consisted of an online survey conducted among manag...
The visualization of magnetic flux lines is one of the most effective ways to intuitively grasp a magnetic field. The depiction of continuous and smooth magnetic flux lines according to the magnetic field is of paramount importance. Thus, it is important to adequately allocate the distribution of magnetic flux lines in the analyzed space. We have a...
The study evaluates the application of the energy efficiency practices in the hotel industry. It explores the determinants of energy consumption in three and four-star hotels in Macedonia. The research investigates the impacts of several elementary components of the energy practices, by measuring the current level of influence. The data were obtain...
In this paper, an extension of the previously developed 2-D dynamic bubble system for 3D
automatic mesh generation using tetrahedral finite elements is presented. Initially, a set of vertices in side the entire analysis region is generated using 3-D dynamic bubble system, followed by automatic mesh generation according to the Delaunay tessellatio...
In this paper, 3-D finite element analysis of a magneto-thermal coupled problem with moving conductors is presented. For improved accuracy and due to the different character of the approximated unknown variables, two appropriate solution spaces are considered as vectorial space using first-order, edge-based finite elements for analysis of the vec...
An automatic mesh generator for hexahedral elements has already been proposed. However, the application of this generator to a model with both the hexahedral and the cylindrical objects results with generated meshes with large number of flat finite elements. It is known that a large number of flat elements lead to much lengthy finite element analys...
We have proposed an automatic mesh generator for hexahedral elements previously. This technique can be applied to almost all models. However, if it is applied to a cylindrical model, its mesh, which contains many flat elements, is generated. Using such mesh, it is time consuming to perform finite element analysis (FEA) and its result may not have e...
This paper describes an interactive visualization system with force feedback device in three-dimensional (3-D) electromagnetics. We present an extension and improvement of the previously developed two-dimensional (2-D) interactive visualization system used for visualization of various 2-D field distribution maps with arbitrarily movable objects ins...
In this paper, an automatic hexahedral mesh generator for rotating machines is proposed. In the proposed method, hexahedral mesh with well-shaped elements is generated by means of transformation of coordinates of the analysis model. The main feature of this method is its applicability for meshing models with cylindrical shape due to provided coordi...
This paper presents the existing situation of the Macedonian power and metering system in the State owned Public Enterprise Electric Power Company of Macedonia (ESM). Harmonic measurements have been performed in the Macedonian power distribution network according national and international standards. Also the restructuring, privatization and deregu...
In this paper, a method for automatic hexahedral (Hex) mesh
generation for electromagnetic field analysis is presented. In this
method, the shape recognition technique and the tree method are used.
Utilizing the shape recognition technique, a mesh is generated in a
complicated analysis domain, and a high-quality Hex mesh is obtained. By
using the t...
In this paper, a method for automatic quadrilateral (Quad) mesh
generation using dynamic bubble system is presented. The proposed method
can be separated into three separate computational processes: the first
one generates nodes inside the analysis domain using physically-based
system of bubbles, the second one for automatic generation of Quad
fini...
In rolling systems with direct transmission it is strongly desired that the temperature distri-bution of the metal billet is uniform. For that purpose, an optimal induction heating system must be developed. In this paper, a new 2D simulation system for analysis of magneto-thermal coupled problem inside the billet is presented. This system comprises...
Animation of a time-varying 3-D scalar field distribution requires generation of a set of images at a sampled time intervals i.e. frames. Although, volume rendering method can be very advantageous for such 3-D scalar field visualizations, in case of animation, the computation time needed for generation of the entire set of images can be considerabl...
A new FEA approach utilizing the concept of visual computing is proposed. Conventional FEA is improved by a new visual computing method. This new method is based on rapid data interchange among program modules through the use of shared computer memory. The concept enables easy control of the analysis process through interactive user input. It also...
Although numerically very ecient the nite element method exhibits diculties whenever the remeshing of the analysis domain must be performed. For such problems utilizing meshless computation methods is very promising. In this paper, a kind of meshless method called the element-free Galerkin method is introduced for electromagnetic eld computation. T...
This paper deals with design improvements on graded insulation of power transformers using transient electric eld analysis and a visualization technique. The calculation method for transient electric eld analysis inside a power transformer impressed with impulse voltage is presented: Initially, the concentrated electric network for the power transf...
In this paper, the evaluation of the characteristics of a new type rotating eddy-current probe for nondestructive Eddy-Current Testing (ECT) is carried out using 3-D edge-based FEM. The changes of the induced electromotive force are monitored for various inner and outer types of thin cracks inside the metal plate. It was veri ed that although the i...
In this paper a fast multigrid solution method for edge-based
finite element magnetostatic field computation with nested meshes is
introduced and its efficiency is investigated. Special prolongation and
restriction matrices were constructed according to the nature of the
edge based field approximation. The comparison of the computation speed
betwee...
A new hybrid computational procedure utilizing the Element-free
Galerkin method (EFGM) and the finite element method (FEM) for
electromagnetic field computations is proposed. With the proposed
method, only a part of the analyzed domain is modeled using the EFGM,
while the rest of the analysis domain is discretized using the ordinary
FEM. The connec...
Stochastic searching algorithms such as the Genetic Algorithms
(GA's) are commonly used for shape optimization of electromagnetic
devices. Although very robust and easy applicable, the GA's are usually
time consuming. In this paper, we present a new improved method for
optimization of electromagnetic devices that utilizes the ordinary GA
with enric...
A new interactive visualization system for educational and design
purposes in 2D electromagnetics is proposed, The proposed system using
numerically obtained results for several typical model configurations
can display interactively electromagnetic field phenomena for any other
model configuration bounded with the previously computed ones. It uses...
This paper deals with design improvements on graded insulation of
power transformers using transient electric field analysis and a
visualization technique. The calculation method for transient electric
field analysis inside a power transformer impressed with impulse voltage
is presented: Initially, the concentrated electric network for the power
tr...
Investigation of the efficiency of the multigrid solution methods
for electromagnetic field computations using nested finite element
meshes is presented. Two type of multigrid algorithms, the V-cycle and
the W-cycle multigrids are investigated and the results for the
convergence rate of the iterative process and the computation time are
compared wi...
In this paper, a new dynamically adjustable genetic algorithm for
inverse shape optimization of electrical devices is proposed. The
algorithm starts with initial population which is not entirely randomly
defined and dynamically changes the position and the width of the
searching space as the searching procedure evolves with time and the
objective f...
Computer simulation of the operating characteristics of a
three-phase brushless synchronous generator with a self-exciter is
presented. A voltage driven nonlinear time-periodic FEA is utilized to
compute accurately the magnetic field distribution and the induced
voltages and currents simultaneously. A method for numerical modeling of
the diodes is...
One of the most challenging ideas in the calculation of EM fields
is to use an isosurface visualization for the post-processing of the
large amount of output data obtained from various numerical methods,
such as the finite element method (FEM). In this paper, the authors
present a newly developed multipurpose visual system for the 3-D display
of sc...
In this paper, an extension of the previously developed 2-D
dynamic bubble system for 3-D automatic mesh generation using
tetrahedral finite elements is presented. Initially, a set of vertices
inside the entire analysis region is generated using a 3-D dynamic
bubble system, followed by automatic mesh generation according to the
Delaunay tessellatio...
An improved method for the inverse shape optimization of magnetic
devices using genetic algorithms (GAs) with dynamically adjustable
parameters is presented. The proposed method starts from an initial
population using large number of bits per chromosome enabling searching
for the optimal solution in a wider region without aggravating the
computatio...
In this paper, a new adaptive method for finite element analysis using dynamic bubble system taking into account magnitude of magnetic flux density is proposed. The error estimation is performed according to the Zienkiewicz and Zhu error norm estimator and using improved solution of the problem instead of the unknown exact values which is both stra...
Although numerically very efficient the finite element method
exhibits difficulties whenever the remeshing of the analysis domain must
be performed. For such problems utilizing meshless computation methods
is very promising. In this paper, a kind of meshless method called the
element-free Galerkin method is introduced for electromagnetic field
comp...
Animation of a time-varying 3-D scalar field distribution requires
generation of a set of images at a sampled time intervals i.e. frames.
Although, volume rendering method can be very advantageous for such 3-D
scalar field visualizations, in case of animation, the computation time
needed for generation of the entire set of images can be considerabl...
To grasp the physical behavior of a three dimensional vector field
phenomenon, not only it's magnitude, but also its direction, loci and
the streamlines of the vector field should be visualized simultaneously.
In this paper, a new method for vector field visualization which
satisfies the above mentioned criteria is presented. The method employs
in...
In this paper, we discuss the properties of the mixed consistently and non-consistently linear (Whitney) edge nite elements for 3D eddy-current analysis. We report that by mixing these two types of nite elements the computational resources and ef-forts can be greatly reduced for the same accuracy of the results. Due to the nature of the edge-based...
In this paper the investigation of the ef-ciency of the multigrid method as a solution method for large systems of algebraic equations that arise from ordinary nite element analysis is presented. The mathematical background for multigrid methods and some points regarding deenition of restriction and prolongation matrices for multigrid nite element...
|In this paper, a new adaptive method for nite element analysis using dynamic bubble system is proposed. The error estimation is performed according to the Zienkiewicz-Zhu error norm estimator and using improved solution of the problem instead of the unknown exact values which is both straightforward and computationally cheap. Mesh density is easil...
In this paper, a new dynamically adjustable genetic algorithm for
inverse pole face optimization of rotating machines is proposed. The
algorithm starts with initial population which is not entirely randomly
defined and dynamically changes the position and the width of the
searching space as the searching procedure evolves with time and the
objectiv...
A surface integration method for modeling of permanent magnets in 3-D space using edge nite elements is presented, where the value of the coercive magnetic force H c is integrated only over the entire surface area of the perma-nent magnet. This allows direct computation of the equivalent source current values, which are afterwards assigned to the s...
A surface integration method for modeling of permanent magnets in three-dimensional space using edge finite elements is presented, where the value of the coercive magnetic force Hc is integrated only over the entire surface area of the permanent magnet. This allows direct computation of the equivalent source current values, which are afterwards ass...
In this article an improved automatic mesh generation method for finite element analysis (FEA) using a dynamic bubble system is presented. The proposed method features two separate routines; one for automatic generation of a set of nodes in accordance with the desired mesh density and the Second Newton’s Law of dynamics, and one for automatic gener...
A new FEA approach utilizing the concept of visual computing is
proposed. Conventional FEA is improved by a new visual computing method.
This new method is based on rapid data interchange among program modules
through the use of shared computer memory. The concept enables easy
control of the analysis process through interactive user input. It also...
In this paper, a novel method for generating tetrahedral
finite-element meshes suitable for the 3D finite element analysis of
rotating machines is presented. The proposed method enables the easy
development of 3D meshes for various rotating machines, especially in
the end-coil region and the surrounding air region. Tessellation of the
3D region is...
An improved method for interactive visualization of magnetic flux
lines in 3-D space is presented. The problem of determining the number
of flux lines and their starting position is treated and solved using a
simple and computationally efficient algorithm which incorporates the
intensity values of the magnetic flux-density and several appropriate
w...
In this paper, 3-D finite element analysis of a magneto-thermal
coupled problem with moving conductors is presented. For improved
accuracy and due to the different character of the approximated unknown
variables, two appropriate solution spaces are considered: a vectorial
space using first-order, edge-based finite elements for analysis of the
vecto...
Especially for higher frequencies, 3-d eddy current analysis usual requires a very fine division mesh, resulting in long computation time and high cost. In this paper the authors present an improved method for analyzing complex 3-D eddy current problems using an edge finite element method, which enables analysis to take place while using only a sma...
One property of the Hopfield neural network is the monotonous
minimization of energy as time proceeds. In this paper, this property is
applied to minimize the energy functional obtained by ordinary finite
element analysis. The mathematical representation and correlation
between finite element and neural network calculus are presented. The
selection...
A new mixed procedure for solving the system of algebraic
equations generated by the edge finite element method (EFEM) for
ungauged vector potential formulation is proposed. The singularity of
the matrix of the system obtained by ungauged vector formulation results
in unstable and nonuniform convergence rates of the Preconditioned
Conjugate Gradien...
To optimize the production of high-efficiency induction skull
melting furnace, we analyzed magnetic flux density, eddy current and
electromagnetic force distributions using the 3D edge-based finite
element method excited from a voltage source. Changing the number of
copper rods and, therefore, the distance between them, we analyzed both
the intensi...
Current parallel processing approaches in finite element analysis
can be roughly classified into two categories: In the domain method, an
analysis region is divided into subdomains and one CPU assigned to each
subdomain. Alternatively, one may calculate in parallel the matrix and
vector products which arise in the process of solving the set of
simu...
We propose a new analytical method for computation of magnetic
flux lines in 3-D space. Using the results obtained from finite element
analysis and the magnetic flux line equation in 3-D space, the sequence
of line segments that construct the magnetic flux line is computed
analytically. The proposed method reduces computational time by nearly
five...
Visualization of a magnetic flux density distribution in three-dimensional (3-D) finite element analysis (FEA) is very important in order to grasp the real behavior of the magnetic field, especially in the design process. In this paper, we present an improved method for visualizing magnetic flux density distributions calculated by 3-D first-order e...
The application of artificial neural network technique and particularly the Hopfield neural network in ordinary finite element analysis is presented. Due to the main property of the Hopfield neural network to minimize the stored network energy, this type of neural network can easily find application in finite element analysis. In this paper two spe...
Suitable fine mesh divisions are essential to obtain fast and accurate solutions in two-dimensional electric field analysis. However, the development of such fine division meshes always requires considerable technical knowledge and experience. A way of solution which proves highly effective is the application of adaptive methods for refinement of t...
In this paper, a brushless three-phase synchronous induction motor with two stators which can self-start as a wound-rotor induction motor without external secondary resistance is proposed. In the proposed motor, two excitation schemes, separately and self-ones, can be realized. In the separately excitation scheme, the proposed machine can operate a...
![Fig. 2. Eticheta schimbului computerizat de energie [6] Figure 2....](profile/Krste-Najdenkoski-2/publication/237652329/figure/fig2/AS:669329108508687@1536591903952/Eticheta-schimbului-computerizat-de-energie-6-Figure-2-Computerized-Energy-Exchange_Q320.jpg)
Deregulation changed the electrical industry from being a regulated priced structure to a market based pricing one. The deregulation of the market brought with it the concept of auctions and the word auction entered the electrical engineers dictionary for the first time. An auction can be defined as a game of incomplete instructions for determining...
Questions
Question (1)
Development of new gas network in such cases seems to be expensive, needs land expropriation, time, resources and closing of the traffic, etc. Could, for example make local gas storage for each building and establish a smaller and organized local gas networks for one or several buildings using special pipes placed along building's facade and could deliver gas to each and every household within the building(s)?
Something similar I have already seen in Japan, where a special company is responsible for gas distribution for such small local grids (one or several buildings closely placed or even a small block of buildings or houses) by means of trucks that deliver on regular basis to each local storage specific amount of gas cylinders, replacing empty ones with new ones.
Can somebody provide me with more information on establishing and operation of such distribution system lof natural gas or city gas to final customers?
Thank you.
