TY  - JOUR
AU  - Kostić, Srđan
AU  - Stojković, Milan
AU  - Guranov, Iva
AU  - Vasović, Nebojša
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3956
AB  - Authors provide extensive analysis of groundwater level dynamics, in order to classify the observed data, to determine the role of contributing factors and to derive specific estimation models, based on the recordings made at four piezometric stations in Serbia: Leskovac, Kruševac, Negotin and Bogatić. Results obtained indicate the predominant impact of noise confirmed by surrogate data testing, determinism test and Box–Jenkins approach. It is shown that surface water level has a strong impact on the observed dynamics, while the effect of rainfall is almost statistically insignificant. Authors also propose different estimation models: as a combination of deterministic and stochastic components, as a nonlinear function of contributing factors and in a form of system of stochastic differential equations. At the end, authors illustrate simple application of some of derived models in engineering practice for slope stability analyzes.
PB  - Elsevier
T2  - Chaos, Solitons & Fractals
T1  - Revealing the background of groundwater level dynamics: Contributing factors, complex modeling and engineering applications
EP  - 421
IS  - October
SP  - 408
VL  - 127
DO  - 10.1016/j.chaos.2019.07.007
ER  - 

@article{
author = "Kostić, Srđan and Stojković, Milan and Guranov, Iva and Vasović, Nebojša",
year = "2019",
abstract = "Authors provide extensive analysis of groundwater level dynamics, in order to classify the observed data, to determine the role of contributing factors and to derive specific estimation models, based on the recordings made at four piezometric stations in Serbia: Leskovac, Kruševac, Negotin and Bogatić. Results obtained indicate the predominant impact of noise confirmed by surrogate data testing, determinism test and Box–Jenkins approach. It is shown that surface water level has a strong impact on the observed dynamics, while the effect of rainfall is almost statistically insignificant. Authors also propose different estimation models: as a combination of deterministic and stochastic components, as a nonlinear function of contributing factors and in a form of system of stochastic differential equations. At the end, authors illustrate simple application of some of derived models in engineering practice for slope stability analyzes.",
publisher = "Elsevier",
journal = "Chaos, Solitons & Fractals",
title = "Revealing the background of groundwater level dynamics: Contributing factors, complex modeling and engineering applications",
pages = "421-408",
number = "October",
volume = "127",
doi = "10.1016/j.chaos.2019.07.007"
}

Kostić, S., Stojković, M., Guranov, I.,& Vasović, N.. (2019). Revealing the background of groundwater level dynamics: Contributing factors, complex modeling and engineering applications. in Chaos, Solitons & Fractals
Elsevier., 127(October), 408-421.
https://doi.org/10.1016/j.chaos.2019.07.007

Kostić S, Stojković M, Guranov I, Vasović N. Revealing the background of groundwater level dynamics: Contributing factors, complex modeling and engineering applications. in Chaos, Solitons & Fractals. 2019;127(October):408-421.
doi:10.1016/j.chaos.2019.07.007 .

Kostić, Srđan, Stojković, Milan, Guranov, Iva, Vasović, Nebojša, "Revealing the background of groundwater level dynamics: Contributing factors, complex modeling and engineering applications" in Chaos, Solitons & Fractals, 127, no. October (2019):408-421,
https://doi.org/10.1016/j.chaos.2019.07.007 . .

TY  - CONF
AU  - Hasan, Mohammad Sakib
AU  - Svorcan, Jelena
AU  - Kostić, Ivan
AU  - Simonović, Aleksandar
AU  - Kostić, Srđan
AU  - Ivanov, Toni
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4303
AB  - Observation, maintenance, surveillance, monitoring, remote sensing and security tasks could be defined as the main application of UAVs (Unmanned Air Vehicle). In spite of the fact that all UAV systems have many elements other than the air vehicle, they are frequently classified by the capability or size of the UAVs that is required to perform the mission. Air forces are using HALE (High Altitude Long Endurance) UAVs from fixed bases which can carry out extremely long-range
reconnaissance and surveillance. Different types of wing are used in unmanned air vehicle. This paper represents preliminary aerodynamic performance estimation of HALE UAV wings.
PB  - Belgrade :  Military Technical Institute - VTI
C3  - Proceedings / 8th International Scientific Conference on Defensive Technologies OTEH 2018
T1  - Preliminary aerodynamic performance estimation of HALE UAV wings
EP  - 43
SP  - 39
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4303
ER  - 

@conference{
author = "Hasan, Mohammad Sakib and Svorcan, Jelena and Kostić, Ivan and Simonović, Aleksandar and Kostić, Srđan and Ivanov, Toni",
year = "2018",
abstract = "Observation, maintenance, surveillance, monitoring, remote sensing and security tasks could be defined as the main application of UAVs (Unmanned Air Vehicle). In spite of the fact that all UAV systems have many elements other than the air vehicle, they are frequently classified by the capability or size of the UAVs that is required to perform the mission. Air forces are using HALE (High Altitude Long Endurance) UAVs from fixed bases which can carry out extremely long-range
reconnaissance and surveillance. Different types of wing are used in unmanned air vehicle. This paper represents preliminary aerodynamic performance estimation of HALE UAV wings.",
publisher = "Belgrade :  Military Technical Institute - VTI",
journal = "Proceedings / 8th International Scientific Conference on Defensive Technologies OTEH 2018",
title = "Preliminary aerodynamic performance estimation of HALE UAV wings",
pages = "43-39",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4303"
}

Hasan, M. S., Svorcan, J., Kostić, I., Simonović, A., Kostić, S.,& Ivanov, T.. (2018). Preliminary aerodynamic performance estimation of HALE UAV wings. in Proceedings / 8th International Scientific Conference on Defensive Technologies OTEH 2018
Belgrade :  Military Technical Institute - VTI., 39-43.
https://hdl.handle.net/21.15107/rcub_machinery_4303

Hasan MS, Svorcan J, Kostić I, Simonović A, Kostić S, Ivanov T. Preliminary aerodynamic performance estimation of HALE UAV wings. in Proceedings / 8th International Scientific Conference on Defensive Technologies OTEH 2018. 2018;:39-43.
https://hdl.handle.net/21.15107/rcub_machinery_4303 .

Hasan, Mohammad Sakib, Svorcan, Jelena, Kostić, Ivan, Simonović, Aleksandar, Kostić, Srđan, Ivanov, Toni, "Preliminary aerodynamic performance estimation of HALE UAV wings" in Proceedings / 8th International Scientific Conference on Defensive Technologies OTEH 2018 (2018):39-43,
https://hdl.handle.net/21.15107/rcub_machinery_4303 .

TY  - GEN
AU  - Kostić, Srđan
AU  - Guranov, Iva
AU  - Vasović, Nebojša
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5396
T2  - Техничко решење категорије М82, прихваћено на VIII седници Матичног одбора за уређење, заштиту и коришћење земљишта, воде и ваздуха, 23.10.2017.г.
T1  - Нов поступак прорачуна стабилности косина у интактним чврстим стенским масама, стенским масама са једним предоминантним механичким дисконтинуитетом и стенским масама са развијеном кором површинског распадања
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5396
ER  - 

@misc{
author = "Kostić, Srđan and Guranov, Iva and Vasović, Nebojša",
year = "2017",
journal = "Техничко решење категорије М82, прихваћено на VIII седници Матичног одбора за уређење, заштиту и коришћење земљишта, воде и ваздуха, 23.10.2017.г.",
title = "Нов поступак прорачуна стабилности косина у интактним чврстим стенским масама, стенским масама са једним предоминантним механичким дисконтинуитетом и стенским масама са развијеном кором површинског распадања",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5396"
}

Kostić, S., Guranov, I.,& Vasović, N.. (2017). Нов поступак прорачуна стабилности косина у интактним чврстим стенским масама, стенским масама са једним предоминантним механичким дисконтинуитетом и стенским масама са развијеном кором површинског распадања. in Техничко решење категорије М82, прихваћено на VIII седници Матичног одбора за уређење, заштиту и коришћење земљишта, воде и ваздуха, 23.10.2017.г..
https://hdl.handle.net/21.15107/rcub_machinery_5396

Kostić S, Guranov I, Vasović N. Нов поступак прорачуна стабилности косина у интактним чврстим стенским масама, стенским масама са једним предоминантним механичким дисконтинуитетом и стенским масама са развијеном кором површинског распадања. in Техничко решење категорије М82, прихваћено на VIII седници Матичног одбора за уређење, заштиту и коришћење земљишта, воде и ваздуха, 23.10.2017.г.. 2017;.
https://hdl.handle.net/21.15107/rcub_machinery_5396 .

Kostić, Srđan, Guranov, Iva, Vasović, Nebojša, "Нов поступак прорачуна стабилности косина у интактним чврстим стенским масама, стенским масама са једним предоминантним механичким дисконтинуитетом и стенским масама са развијеном кором површинског распадања" in Техничко решење категорије М82, прихваћено на VIII седници Матичног одбора за уређење, заштиту и коришћење земљишта, воде и ваздуха, 23.10.2017.г. (2017),
https://hdl.handle.net/21.15107/rcub_machinery_5396 .

TY  - CONF
AU  - Guranov, Iva
AU  - Kostić, Srđan
AU  - Vasović, Nebojša
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3977
AB  - In this paper, authors examine the groundwater level oscillation at groundwater station 
Bogatić near Šabac (Serbia), for the period 2002-2014. Analysis is done by transforming the 
observation data into Fourier series within fundamental period of 5 years, and by deriving a 
model based on the autocorrelation properties of the recorded data. One should note that this 
is the first time that such analyzes are preformed for the groundwater level oscillation 
observed in Serbia. The derived model based on groundwater level periodicity is represented 
by a combination of sine and cosine waves. Analysis shows rather satisfying statistical 
accuracy of the model, with R
2=0.707 and mean absolute error of 0.34m, which fails to 
capture the highest values of the groundwater level for the analyzed period. Second model is 
expressed in a form of a simple correlation between the two successive observations, with a 
time delay τ=1 and 4. Both models are derived for the period 2003-2009, and their prediction 
accuracy is checked for the period 2010-2014. Both of these models provide more accurate 
predictions in comparison to the model based on the groundwater level periodicity.
PB  - Serbian Society of Mechanics
C3  - Proceedings of the The 6th International Congress of Serbian Society of Mechanics, Tara, June 19-21, 2017
T1  - Periodic and autoregressive models of groundwater level dynamics
EP  - 10
SP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_machinery_3977
ER  - 

@conference{
author = "Guranov, Iva and Kostić, Srđan and Vasović, Nebojša",
year = "2017",
abstract = "In this paper, authors examine the groundwater level oscillation at groundwater station 
Bogatić near Šabac (Serbia), for the period 2002-2014. Analysis is done by transforming the 
observation data into Fourier series within fundamental period of 5 years, and by deriving a 
model based on the autocorrelation properties of the recorded data. One should note that this 
is the first time that such analyzes are preformed for the groundwater level oscillation 
observed in Serbia. The derived model based on groundwater level periodicity is represented 
by a combination of sine and cosine waves. Analysis shows rather satisfying statistical 
accuracy of the model, with R
2=0.707 and mean absolute error of 0.34m, which fails to 
capture the highest values of the groundwater level for the analyzed period. Second model is 
expressed in a form of a simple correlation between the two successive observations, with a 
time delay τ=1 and 4. Both models are derived for the period 2003-2009, and their prediction 
accuracy is checked for the period 2010-2014. Both of these models provide more accurate 
predictions in comparison to the model based on the groundwater level periodicity.",
publisher = "Serbian Society of Mechanics",
journal = "Proceedings of the The 6th International Congress of Serbian Society of Mechanics, Tara, June 19-21, 2017",
title = "Periodic and autoregressive models of groundwater level dynamics",
pages = "10-1",
url = "https://hdl.handle.net/21.15107/rcub_machinery_3977"
}

Guranov, I., Kostić, S.,& Vasović, N.. (2017). Periodic and autoregressive models of groundwater level dynamics. in Proceedings of the The 6th International Congress of Serbian Society of Mechanics, Tara, June 19-21, 2017
Serbian Society of Mechanics., 1-10.
https://hdl.handle.net/21.15107/rcub_machinery_3977

Guranov I, Kostić S, Vasović N. Periodic and autoregressive models of groundwater level dynamics. in Proceedings of the The 6th International Congress of Serbian Society of Mechanics, Tara, June 19-21, 2017. 2017;:1-10.
https://hdl.handle.net/21.15107/rcub_machinery_3977 .

Guranov, Iva, Kostić, Srđan, Vasović, Nebojša, "Periodic and autoregressive models of groundwater level dynamics" in Proceedings of the The 6th International Congress of Serbian Society of Mechanics, Tara, June 19-21, 2017 (2017):1-10,
https://hdl.handle.net/21.15107/rcub_machinery_3977 .

TY  - JOUR
AU  - Kostić, Srđan
AU  - Guranov, Iva
AU  - Vasović, Nebojša
AU  - Kuzmanović, Dragoslav
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3957
AB  - Authors analyze stress-strain distribution within slope using the shear stress reduction technique based on finite element method, which was previously confirmed to provide approximately the same results as the Janbu's corrected limit equilibrium method. Results obtained indicate that the largest vertical displacements occur at the slope base and crest, while central part of the slope is exposed to the largest horizontal displacements. Normal and shear stress show maximum values in the middle part of the slope. It was also determined that separate stress-strain relations could be derived for the exact upper and lower part of the rupture surface.
PB  - Serbian Society of Mechanics
T2  - Theoretical and Applied Mechanics
T1  - Mechanics of weathered clay-marl rock masses along the rupture surface in homogeneous dry slopes
EP  - 98
IS  - 1
SP  - 85
VL  - 43
DO  - 10.2298/TAM160531005K
ER  - 

@article{
author = "Kostić, Srđan and Guranov, Iva and Vasović, Nebojša and Kuzmanović, Dragoslav",
year = "2016",
abstract = "Authors analyze stress-strain distribution within slope using the shear stress reduction technique based on finite element method, which was previously confirmed to provide approximately the same results as the Janbu's corrected limit equilibrium method. Results obtained indicate that the largest vertical displacements occur at the slope base and crest, while central part of the slope is exposed to the largest horizontal displacements. Normal and shear stress show maximum values in the middle part of the slope. It was also determined that separate stress-strain relations could be derived for the exact upper and lower part of the rupture surface.",
publisher = "Serbian Society of Mechanics",
journal = "Theoretical and Applied Mechanics",
title = "Mechanics of weathered clay-marl rock masses along the rupture surface in homogeneous dry slopes",
pages = "98-85",
number = "1",
volume = "43",
doi = "10.2298/TAM160531005K"
}

Kostić, S., Guranov, I., Vasović, N.,& Kuzmanović, D.. (2016). Mechanics of weathered clay-marl rock masses along the rupture surface in homogeneous dry slopes. in Theoretical and Applied Mechanics
Serbian Society of Mechanics., 43(1), 85-98.
https://doi.org/10.2298/TAM160531005K

Kostić S, Guranov I, Vasović N, Kuzmanović D. Mechanics of weathered clay-marl rock masses along the rupture surface in homogeneous dry slopes. in Theoretical and Applied Mechanics. 2016;43(1):85-98.
doi:10.2298/TAM160531005K .

Kostić, Srđan, Guranov, Iva, Vasović, Nebojša, Kuzmanović, Dragoslav, "Mechanics of weathered clay-marl rock masses along the rupture surface in homogeneous dry slopes" in Theoretical and Applied Mechanics, 43, no. 1 (2016):85-98,
https://doi.org/10.2298/TAM160531005K . .

TY  - CONF
AU  - Kostić, Srđan
AU  - Guranov, Iva
AU  - Vasović, Nebojša
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3976
AB  - In present paper we analyze dynamics of groundwater level oscillation recorded at two
piezometric stations in Pancevacki rit: ‘’Cuvarnica’’, and ‘’Borca’’ in period 2007-2013. Primary 
goal of the performed research was to determine the character of the main mechanism behind 
these oscillations, which could further serve as a solid base for creating an appropriate prediction
model. Dynamics of the recorded time series is examined using methods of nonlinear time series 
analysis and delay embedding theorem. After embedding the observed time series into three dimensional phase space with embedding delay τ=4, results of surrogate data testing showed that 
analyzed time series originate from a stationary Gaussian linear process that could be distorted by 
a monotonic, instantaneous, time-independent nonlinear function. This is further confirmed by
low values of determinism coefficient and corresponding vector field composed of vectors of 
different length, indicating high level of stochasticity in the observed data. The obtained results 
provide solid foundation for future research, with the final goal of creating an appropriate 
prediction model.
PB  - Serbian Society of Mechanics
C3  - Proceedings of the The 5th International Congress of Serbian Society of Mechanics, Arandjelovac, June 15-17, 2015
T1  - Nonlinear time series analysis of fluid dynamics: stohastic groundwater level oscillation
EP  - 8
SP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_machinery_3976
ER  - 

@conference{
author = "Kostić, Srđan and Guranov, Iva and Vasović, Nebojša",
year = "2015",
abstract = "In present paper we analyze dynamics of groundwater level oscillation recorded at two
piezometric stations in Pancevacki rit: ‘’Cuvarnica’’, and ‘’Borca’’ in period 2007-2013. Primary 
goal of the performed research was to determine the character of the main mechanism behind 
these oscillations, which could further serve as a solid base for creating an appropriate prediction
model. Dynamics of the recorded time series is examined using methods of nonlinear time series 
analysis and delay embedding theorem. After embedding the observed time series into three dimensional phase space with embedding delay τ=4, results of surrogate data testing showed that 
analyzed time series originate from a stationary Gaussian linear process that could be distorted by 
a monotonic, instantaneous, time-independent nonlinear function. This is further confirmed by
low values of determinism coefficient and corresponding vector field composed of vectors of 
different length, indicating high level of stochasticity in the observed data. The obtained results 
provide solid foundation for future research, with the final goal of creating an appropriate 
prediction model.",
publisher = "Serbian Society of Mechanics",
journal = "Proceedings of the The 5th International Congress of Serbian Society of Mechanics, Arandjelovac, June 15-17, 2015",
title = "Nonlinear time series analysis of fluid dynamics: stohastic groundwater level oscillation",
pages = "8-1",
url = "https://hdl.handle.net/21.15107/rcub_machinery_3976"
}

Kostić, S., Guranov, I.,& Vasović, N.. (2015). Nonlinear time series analysis of fluid dynamics: stohastic groundwater level oscillation. in Proceedings of the The 5th International Congress of Serbian Society of Mechanics, Arandjelovac, June 15-17, 2015
Serbian Society of Mechanics., 1-8.
https://hdl.handle.net/21.15107/rcub_machinery_3976

Kostić S, Guranov I, Vasović N. Nonlinear time series analysis of fluid dynamics: stohastic groundwater level oscillation. in Proceedings of the The 5th International Congress of Serbian Society of Mechanics, Arandjelovac, June 15-17, 2015. 2015;:1-8.
https://hdl.handle.net/21.15107/rcub_machinery_3976 .

Kostić, Srđan, Guranov, Iva, Vasović, Nebojša, "Nonlinear time series analysis of fluid dynamics: stohastic groundwater level oscillation" in Proceedings of the The 5th International Congress of Serbian Society of Mechanics, Arandjelovac, June 15-17, 2015 (2015):1-8,
https://hdl.handle.net/21.15107/rcub_machinery_3976 .