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Bulunan: 20 Adet 0.001 sn
Atıf Dizini : Scopus ✕Koleksiyon : İnşaat Mühendisliği ... ✕
Koleksiyon [3]
İlgili Araştırmacılar [20]
Ambargo Durumu [1]
Tam Metin [1]
Yayın Türü [1]
Yazar/lar [20]
Atıf Dizini [2]
Konu Başlıkları [20]
Yayıncı [16]
Tez Danışmanı [1]
Yayın Tarihi [7]
Yayın Dili [3]
Erişime Açık

Forecasting of solar radiation using different machine learning approaches

DEMİR, Vahdettin | ÇITAKOĞLU, Hatice

In this study, monthly solar radiation (SR) estimation was performed using five different machine learning-based approaches. The models used are support vector machine regression (SVMR), long short-term memory (LSTM), Gaussian process regression (GPR), extreme learning machines (ELM) and K-nearest neighbors (KNN). Modeling of these approaches was carried out in two stages. In the first stage, VIF analysis was carried out to develop the model. Thus, the input parameters that decrease the performance of the model are removed. In the second stage, remaining input parameters such as meteorological ...Daha fazlası

Makale 2022 Neural Computing and Applications 6 Görüntülenme
Erişime Açık

Water level change of lakes and sinkholes in Central Turkey under anthropogenic effects

DEMİR, Vahdettin | ÜLKE KESKİN, Aslı

Determining water level changes in lakes is significant for sustainable water supply planning, flood control, water resource management, and economic development with ecosystem sustainability. Trend analysis is a commonly used tool for detecting changes in hydrologic time series of quantities such as lake level, precipitation and temperature. Trend analysis of meteorological variables is very important for assessing the long-term changes in lake levels. This study examines long-term changes in the lakes in the Central Anatolia region of Turkey. Kızören and Timraş sinkhole lakes and Lakes Tuz a ...Daha fazlası

Makale 2020 Theoretical and Applied Climatology 3 Görüntülenme
Erişime Açık

Static analysis of laminated composite beams based on higher-order shear deformation theory by using mixed-type finite element method

ÖZÜTOK, Atilla | MADENCİ, Emrah

In this paper, mixed finite element (MFEM) equations which are based on a functional are obtained by using the Gâteaux differential (GD) for laminated composite beams. Higher-order shear deformation theory (HOBT) including non-linear distribution of shear stress through thickness of laminated beam is presented. Differential field equations of composite beams are derived from virtual displacement principle. These equations were trans- formed into the operator form and using the mathematical advantages of the proposed the variational method, a functional with geometric and dynamic boundary condi ...Daha fazlası

Makale 2017 International Journal of Mechanical Sciences 3 Görüntülenme
Erişime Açık

Trend analysis of lakes and sinkholes in the Konya Closed Basin, in Turkey

DEMİR, Vahdettin

This study aims to investigate the trend of water-level changes in lakes (Lake Tuz and Lake Beyşehir) and sinkholes (Timraş and Kızören) in the Konya Closed Basin located in Turkey. Water-level changes in these lakes and sinkholes were investigated along with changes in meteorological parameters (precipitation, temperature, and evaporation) and groundwater trends that indicate the climate in the region. Several statistical tests can be used to determine the signifcance of hydrological trends over time. These tests are divided into two categories: parametric and nonparametric. In this study, th ...Daha fazlası

Makale 2022 Natural Hazards 4 Görüntülenme
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Trend Analyses of Meteorological Variables and Lake Levels for Two Shallow Lakes in Central Turkey

YAĞBASAN, Özlem | DEMİR, Vahdettin | YAZICIGİL, Hasan

Trend analyses of meteorological variables play an important role in assessing the long-term changes in water levels for sustainable management of shallow lakes that are extremely vulnerable to climatic variations. Lake Mogan and Lake Eymir are shallow lakes offering aesthetic, recreational, and ecological resources. Trend analyses of monthly water levels and meteorological variables affecting lake levels were done by the Mann-Kendall (MK), Modified Mann-Kendall (MMK), Sen Trend (ST), and Linear trend (LT) methods. Trend analyses of monthly lake levels for both lakes revealed an increasing tre ...Daha fazlası

Makale 2020 Water 8 Görüntülenme
Erişime Açık

Developing numerical equality to regional intensity–duration–frequency curves using evolutionary algorithms and multi‑gene genetic programming

ÇITAKOĞLU, Hatice | DEMİR, Vahdettin

This study aims to carry out regional intensity−duration−frequency (IDF) equality using the relationship with IDF obtained from point frequency analysis. Eleven empirical equations used in the literature for seven climate regions of Turkey were calibrated using particle swarm optimization (PSO) and genetic algorithm (GA) optimization techniques and the obtained results were compared. In addition, in this study, new regional IDF equations were obtained for each region utilizing MultiGene Genetic Programming (MGGP) method. Finally, Kruskal–Wallis (KW) test was applied to the IDF values obtained ...Daha fazlası

Makale 2022 Acta Geophysica 6 Görüntülenme
Erişime Açık

Macro and Polypropropylene fiber effect on reinforced concrete beams with insufficient lap splice length

AKIN, Süleyman Kamil | KARTAL, Saruhan | MÜSEVİTOĞLU, Abdullah | SANCIOĞLU, Sadrettin | ZIA, Ahmad Javid | İLGÜN, Abdulkerim

For longer spans of reinforced concrete elements, design codes dictate the use of sufficient lap splice length. Insufficient lap splice length decreases the flexural strength and ductility of reinforced concrete (RC) beams, while fiber addition improves their load-carrying capacity, ductility, and durability. The main purpose of this study was to examine the effects of micro and macro fibers on the lap splice length of RC beams. In this regard, the effect of fiber addition on RC beams having insufficient lap splice length under bending test has been studied in detail. Mixtures were prepared wi ...Daha fazlası

Makale 2022 Case Studies in Construction Materials 12 Görüntülenme
Erişime Açık

Experimental and analytical investigation of chemical anchors’s behaviour under axial tensile

MÜSEVİTOĞLU, Abdullah | ARSLAN, Musa Hakan | AKSOYLU, Ceyhun | ÖZKIŞ, Ahmet

In this study, to observe the behavior of chemical anchors embedded in concrete under the tensile effect,108 different anchor specimens were prepared with different parameters as concrete compressivestrength, reinforcement bar diameters, anchor depths, sizes of drilled holes, cleanliness of the drilledholes. Pull-out tests were conducted and obtained data were examined with the axial-load capacitiesand the failure situations. Finally, the depth of anchors, compressive strength and reinforcement diame-ter were observed to increase the axial-load-bearing capacity. The specimens cleaned with wate ...Daha fazlası

Makale 2020 9 Görüntülenme
Erişime Açık

Metaheuristics-based Pre-Design Guide for Cantilever Retaining Walls

URAY, Esra | TAN, Özcan | ÇARBAŞ, Serdar | ERKAN, İ.Hakkı

A pre-design guide for cantilever retaining walls and a detail parametric study of such walls is presented here. Mathematical models based on statistical methods were improved for calculating safety factors of sliding, overturning, and slope stability of those walls. The harmony search algorithm (HSA)-a metaheuristic method-was employed to realize reasonable results of the pre-design guide from all distinct cases. Through the design algorithm, the optimal design was determined for varied soil types differently from suggestions of design codes. Thus, an optimal pre-design guide for safe and eco ...Daha fazlası

Makale 2021 TAN, Özcan Teknik Dergi 3 Görüntülenme
Erişime Açık

Parametric investigation for discrete optimal design of a cantilever retaining wall

URAY, Esra | ÇARBAŞ, Serdar | ERKAN, İbrahim Hakkı | TAN, Özcan

In this paper, discrete design optimization of a cantilever retaining wall has been submitted associated with a detailed parametric study of the wall. In optimal design, the minimum wall weight is treated as the objective function. Through design algorithm, the optimal design variables (base width, toe width, thickness of base slab and angle of front face) yielded minimum structural weight of the wall and satisfied stability conditions have been determined for different soil parameter values. At the end, a detail parametric study searching the effect of change of soil parameters on the retaini ...Daha fazlası

Makale 2019 Challenge Journal of Structural Mechanics 2 Görüntülenme
Erişime Açık

Impacts of climatic variables on water-level variations in two shallow Eastern Mediterranean lakes

YAĞBASAN, Özlem | YAZICIGİL, Hasan | DEMİR, Vahdettin

Variations in temperature and precipitation have direct impacts on the physical, chemical and biological characteristics of the shallow lakes. This paper examines the possible linkages between climate variables and the water levels of shallow interconnected Lakes Mogan and Eymir, located 20 km south of Ankara in Central Anatolia. The variations in the lakes' water levels during 1996-2015 are studied and the impacts of climate variables on the lake levels are assessed to address the long-term consequences. The nonparametric Mann-Kendall test was used to quantify trends in the climate variables ...Daha fazlası

Makale 2017 ENVIRONMENTAL EARTH SCIENCES 8 Görüntülenme
Erişime Açık

Variational approximate for high order bending analysis of laminated composite plates

MADENCİ, Emrah | ÖZÜTOK, Atilla

This study presents a 4 node, 11 DOF/node plate element based on higher order shear deformation theory for lamina composite plates. The theory accounts for parabolic distribution of the transverse shear strain through the thickness of the plate. Differential field equations of composite plates are obtained from energy methods using virtual work principle. Differential field equations of composite plates are obtained from energy methods using virtual work principle. These equations were transformed into the operator form and then transformed into functions with geometric and dynamic boundary co ...Daha fazlası

Makale 2020 STRUCTURAL ENGINEERING AND MECHANICS 7 Görüntülenme
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