Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Akpinar, A.(2)
- Ayşegül Fidan(1)
- Baykan, Idris(1)
- Betül Karsli, Melek(1)
- Bülbül, Kenan(1)
- Ersoy, Hakan(1)
- Filiz, M.H.(1)
- Günay, Hamdi Furkan(1)
- K. Kasap, Ayşegül(1)
- Kaygusuz, K.(1)
- Kul, Bilgehan(1)
- Kurt, Burçin(1)
- Kömürcu, M.I.(1)
- Kömürcü, Murat Ihsan(1)
- Odaci, Hatice(1)
- Parsons, Robert L.(1)
- Saka, Fatih(1)
- Seda Sağlamyürek Taşdemir(1)
- Sefa Mızrak(1)
- Tavşan, F.(1)
- Türkkan, Tugba(1)
- Yüksek, Omer(1)
- Çavdar, Ahmet(1)
- Çavdar, Özlem(1)
- Çellek, Seda(1)
- Özölçer, I.H.(1)
- Şenol, A.(1)
Yayınlar
- MakaleAçık Erişim2025What is the relationship between fairness and trust in terms of tax compliance?
Günay, Hamdi Furkan
Two frequently researched factors in the tax compliance literature are perceptions of fairness and trust. Nevertheless, what is known about the relationship between the two variables is limited. Different findings in the literature have encouraged further research. This study aims to examine the relationship between fairness and trust in tax compliance and the role of these variables with multivariate statistical tests. In this direction, survey data were collected from 540 self-employed taxpayers in Istanbul/Turkey. As a result of the multivariate statistical tests carried out by dividing the data in two, the following conclusions were reached: (1) in line with the findings in the literature, perceptions of tax fairness and trust in tax authorities are essential determinants of tax compliance intention; (2) tax fairness positively affects trust in authorities and trust in authorities positively affects tax fairness; (3) both the mediating and moderating role of trust in tax authorities in the relationship between perceptions of tax fairness and tax compliance intention are confirmed; and (4) although there is a mediating effect of perceptions of tax fairness in the relationship between trust in tax authorities and tax compliance intention, the existence of a moderating effect could not be detected.
- MakaleAçık Erişim2025Exploring the Correlation of Physiological Stress Signals with Student Exam Performance: A Preliminary Study
K. Kasap, Ayşegül; Kurt, Burçin
Stress responses in real-world settings are less studied compared to controlled laboratory environments, limiting our understanding of their impact on cognitive performance. This study investigates the relationship between physiological stress signals and academic performance using an open-access dataset of 10 students assessed across three exam sessions (Midterm 1, Midterm 2, and Final Exam). Physiological measures, including electrodermal activity (EDA), heart rate (HR), and skin surface temperature (TEMP), along with exam grades, were analyzed using traditional hypothesis testing, bootstrap method, correlation analysis, and regression tree modeling. To address the small sample size, we validated traditional hypothesis test results with the bootstrap method, and both approaches were compatible. Hypothesis testing revealed no significant differences in physiological measures across exam sessions, supporting the null hypothesis. Grades differed significantly between the final exam and both midterms (p < 0.05). Stress fluctuations were also analyzed across three periods (beginning, middle, and end) for each exam, revealing temporal response variations. Correlation analysis showed a moderate negative relationship between EDA and HR (r = − 0.504, p < 0.01) and a weak positive relationship between EDA and TEMP (r = 0.417, p < 0.05), both intensifying during the final exam. Regression analysis explained 78% of the variance in grades (R2 = 0.78), with regression tree modeling identifying lower skin temperature (< 28 °C) and higher EDA (≥ 0.19) as predictors of poorer performance. These findings underscore the interplay between physiological stress responses and academic outcomes, emphasizing the need for further research and interventions to support student success.
- MakaleYalnız künye2024Availability of sedimentary and volcanic rock deposits on Northeastern Turkey as concrete aggregates
Çavdar, Ahmet; Çavdar, Özlem
Turkey has large aggregate deposits; however, these deposits cannot be used effectively due to a lack of controls. This can lead to fatal errors, as in the 6 February 2023 Turkey-Syria earthquakes. The main motivation of this study is to investigate the availability of existing and new aggregate deposits as concrete aggregates in northeastern Turkey. Thus, the quality of aggregates in this region will be studied comparatively. This research was carried out with aggregate samples taken from 30 different rock quarries in 10 different provinces in this region of Turkey. First, the locations of 30 crushed rock aggregates were identified, and their petrographic, mineralogical, physical, geometric and durability properties were determined. Fifteen different test procedures were applied to 30 crushed rock samples. It was concluded that these rocks are generally sedimentary rock types and that 18 of these 30 samples are of limestone origin. To obtain high-strength concrete, in addition to quality cement, the aggregates used must also be of high quality. The use of aggregate resources mentioned in this study for building concrete will contribute to the production of high-strength concrete. These samples, which generally have sufficient physical, mechanical and durability properties, meet the limitations of the standards much better than concrete aggregates. High-statistical-performance regression equations were obtained for the physical and durability properties.
- MakaleYalnız künye2022Do psychological resilience and life satisfaction affect happiness levels of individuals? A case study for Trabzon University
Bülbül, Kenan; Türkkan, Tugba; Odaci, Hatice
The aim of the research is to examine the effect of psychological resilience and life satisfaction on happiness. Accordingly, the research included students from different departments of Trabzon University in the spring semester of the 2018-2019 educational year and was completed with 558 students who accepted participation. Within the scope of the study, the demographic information form, Brief Resilience Scale, Satisfaction with Life Scale and Oxford Happiness Questionnaire-short form were used. As a result of the analyses, the happiness levels of students did not differ statistically significantly based on their gender and income levels, but differed statistically significantly based on department they studied and this difference was due to students attending the department of foreign languages education. Finally, according to multiple regression analysis, life satisfaction alone predicted 43% of happiness level, while including psychological resilience was included in the model, they both predicted 50%.
- Doktora TeziAçık Erişim2021Ülkelerin afetlere karşı dirençliliğine etki eden faktörlerin coğrafi ağırlıklı regresyon ile belirlenmesi
Sefa Mızrak
Doğal ve teknolojik afetlerin insan, çevre, ekonomi ve sosyal hayat üzerindeki etkileri bilim ve teknolojik gelişmeler yardımıyla önlenebilir. Özellikle uluslararası yapılan bilimsel çalışmalar afetlerin yapısının, özelliklerinin ve etkilerinin daha iyi anlaşılmasını sağlar. Böylece ulusal ve uluslararası düzeyde afetlerin zararları azaltılarak afet sonrası daha dirençli bir toplum inşa edilebilir. Bu çalışmanın amacı ülkelerin afetlere karşı dirençliliğine etki eden faktörleri araştırmaktır. Çalışmada 181 ülkenin 2018 ve 2019 yılındaki verileri analiz edilerek afetlerden toplam etkilenen kişi oranı bağımlı değişken olarak ve ülkelerin gelişmişlik düzeyini gösteren faktörler bağımsız değişken olarak kullanılmıştır. Veriler genel ilişkileri ortaya çıkaran En Küçük Kareler Regresyon Analizi ve bölgesel ilişkileri gösteren Coğrafi Ağırlıklı Regresyon Analizi kullanılarak ArcGIS 10.7 programı yardımıyla analiz edilmiştir. Sonuç olarak, genel modelde 2018 yılında zorunlu eğitim süresi afetlerden toplam etkilenen kişi oranını pozitif ve anlamlı olarak yordayan tek değişkendir. Afetlerden etkilenen kişi oranını 2019 yılında yeni doğan ölüm oranı ve işsizlik pozitif ve anlamlı olarak yorduyorken, kent nüfus oranı negatif ve anlamlı olarak yordamıştır. Bütün bağımsız değişkenlerin afetlerden etkilenen toplam kişi oranı üzerindeki etkisi zamana ve bölgeye bağlı olarak değişmektedir. Bu çalışmanın sonucunun afet risk azaltma çalışmalarında sorumlu olan ulusal ve uluslararası kuruluşların daha etkili ve verimli afet planları yapmalarına katkı sağlaması beklenilmektedir. Ayrıca, çalışmanın yöntemi ve yaklaşımı afetlerle ilgili çalışan bilim insanlarına fikir verecektir.
- Doktora TeziAçık Erişim2021Türkiye'de coğrafi bilgi sistemi tabanlı yatırım teşvik politikalarının oluşturulması
Seda Sağlamyürek Taşdemir
Teşvikler, ekonomi politikalarının yürütülmesinde en önemli araçlardandır. Uzun yıllardır yaygın bir şekilde uygulanan yatırım teşvikleri, Türkiye'deki teşvik sisteminin omurgasını oluşturmaktadır. Bu yüzden yatırım teşviklerinin iyi yönetilmesi ve finansal açıdan geri kazanımlar sağlayacak şekilde dağılımının yapılması gerekmektedir. Bu çalışmanın amacı CAR yöntemine göre Türkiye teşvik haritasının yeniden belirlenmesidir. Çalışmanın amacı doğrultusunda Türkiye'nin yürürlükteki teşvik politikaları değerlendirilerek oluşturulan teşvik haritaları ile teşvik alan illerin yatırım durumları analiz edilmiştir. Çalışmanın analizi için Türkiye'deki illerin 2018 ve 2019 yıllılarındaki verileri kullanılmıştır. İllerin 2020 yılı verilerinin bir kısmına pandemi nedeni ile ulaşılamadığından karşılaştırmalarda 2019 yılı verileri baz yıl olarak kullanılmıştır. Çalışmanın sonucunda illerin enerji, tarım ve ihracat teşvik haritaları mevcut yatırım teşvik haritası ile karşılaştırılarak öneriler sunulmuştur. Anahtar Kelimeler: Yatırım Teşvik Bölgeleri, Türkiye Yatırım Teşvik Haritası, Coğrafi Ağırlıklı Regresyon Analizi, Coğrafi Bilgi Sistemleri
- MakaleAçık Erişim2017Regionalisation of discharges having certain exceedance probabilities and Eastern Black Sea Basin sample
Saka, Fatih; Yüksek, Omer
In many of water engineering studies, it is necessary to determine the amount of water or the probability of discharge at a certain value. However, current discharge measurements are limited and located in discharge gauging stations (DGS). Flow duration curves (FDC) belonging to each DGS can be obtained, but it is necessary to estimate discharge values of the areas having no or insufficient discharge data. For this purpose, studies based on the regionalization of discharge values can be applied. In this study, discharge values of 39 DGS located on Eastern Black Sea Basin in Turkey, and temperature and precipitation of weather stations in the region have been obtained. Drainage areas have been determined. Total annual precipitation and temperature values of DGS have been obtained by using Thiessen method. Values having 20%, 30%, 50%, and 90% exceedance probabilities of annual FDC, have also been correlated with basin characteristics using 10-year average daily discharges. Drainage area, drainage density and mean slope of tributary values were chosen as topographic; and mean annual precipitation height and annual temperature values chosen as climatic parameters. As a result, in the ungauged areas, 20%, 30%, 50%, and 90% exceedance probabilities of annual FDC have been estimated by some basin properties and the results were examined.
- Yüksek Lisans TeziAçık Erişim2015Bankacılık sektörü spesifik değişkenlerinin mali baskınlığa etkileri: Türkiye uygulaması (1980-2012)
Ayşegül Fidan
Türkiye'de 1980'den itibaren bankacılık sektörü gelişmesini hızlandırarak finansal sistem içerisinde önemli bir yer edinmiştir. Finansal sistem içerisinde yer alan bankacılık kesimi işletmelerin fon ihtiyacını karşılayarak ekonomik hayatı olumlu yönde etkilerken mali baskınlık üzerinde de önemli etkilere sahiptir. Bankacılık sektörünün mali baskınlık üzerindeki etkileri ile ilgili literatürde çok az çalışma bulunmaktadır. Bu çalışma, bankacılık sektörünün mali baskınlık üzerindeki etkilerini incelemek amacıyla yapılmıştır. 1980-2012 yılları arasını kapsayan 32 yıllık veriler kullanılarak üç bağımlı değişken için üç ayrı model kurulmuş ve bunlarla on üç bağımsız değişken arasında regresyon analizi yapılmıştır. Çalışmanın sonucunda; tüketici fiyatları enflasyonu ve bankaların gelir-gider yapısı değişkenlerinin özel sektör mali baskınlığına; sermaye yeterliliğinin kamu sektörü mali baskınlığına ve GSYH deflatörü değişkeninin Türkiye'nin toplam mali baskınlığına herhangi bir etkisi bulunmamıştır. Sermaye yeterliliğinin özel sektör mali baskınlığına; döviz kuru ve mevduat faiz oranının kamu sektörü mali baskınlığına ve bankanın aktif kalitesi ve bazı karlılık değişkenlerinin Türkiye'nin toplam mali baskınlığa etkilerinin anlamlı ve negatif yönde olduğu saptanmıştır. Döviz kuru, mevduat faiz oranı ve kredi değişkenlerinin özel sektör mali baskınlığına; tüketici fiyatları enflasyonu, kredi, bankanın aktif kalitesi, likidite ve gelir-gider yapısının kamu sektörü mali baskınlığına ve döviz kuru, bankanın aktif kalitesi ve bazı karlılık değişkenlerinin Türkiye'nin toplam mali baskınlığına etkileri ise anlamlı ve pozitif yönlü olmuştur.
- MakaleAçık Erişim2013Estimation of the soil strength parameters in Tertiary volcanic regolith (NE Turkey) using analytical hierarchy process
Ersoy, Hakan; Betül Karsli, Melek; Çellek, Seda; Kul, Bilgehan; Baykan, Idris; Parsons, Robert L.
Costly and time consuming testing techniques and the difficulties in providing undisturbed samples for these tests have led researchers to estimate strength parameters of soils with simple index tests. However, the paper focuses on estimation of strength parameters of soils as a function of the index properties. Analytical hierarchy process and multiple regression analysis based methodology were performed on datasets obtained from soil tests on 41 samples in Tertiary volcanic regolith. While the hierarchy model focused on determining the most important index properties affecting on strength parameters, regression analysis established meaningful relationships between strength parameters and index properties. The negative polynomial correlations between the friction angle and plasticity properties, and the positive exponential relations between the cohesion and plasticity properties were determined. These relations are characterized by a regression coefficient of 0.80. However, Terzaghi bearing capacity formulas were used to test the model. It is important to see whether there is any statistically significant relation between the calculated and the observed bearing capacity values for model testing. Based on the model, the positive linear correlation characterized by the regression coefficient of 0.86 were determined between bearing capacity values obtained by direct and indirect methods.
- MakaleYalnız künye2012The total electricity energy production of the world, European Union, and Turkey: Projections and comparison
Akpinar, A.; Tavşan, F.; Kömürcü, Murat Ihsan; Filiz, M.H.; Kaygusuz, K.
This study aims to forecast the world's, European Union's (EU), and Turkey's electricity energy generation until 2030. For this purpose, the electricity energy sector of the world, EU, and Turkey was overviewed from past to present. The total electricity energy generation for the world, EU, and Turkey were then modelled by using historical energy generation data as years with regression analysis. Data from 1970 to 2004 for Turkey and data from 1980 to 2004 for the world and EU were used for the projections. Electricity energy productions have been forecasted up to year 2030. According to the results, it is determined that cubic (R2 = 0.997) and linear (R2 = 0.993) models for projection of the world's and EU's electricity energy generation, respectively, is fitness while the quadratic (R2 = 0.996) model fits for the projection of Turkey's total electricity energy generation and Turkey will have 0.995% of the world's electricity energy generation in 2030, while the EU will have 8.41% within the world's electricity energy generation in 2030 if the current trend continues.
- MakaleYalnız künye2011Total electricity and hydroelectric energy generation in Turkey: Projection and comparison
Akpinar, A.; Kömürcu, M.I.; Özölçer, I.H.; Şenol, A.
The main goal of this study is to forecast total electricity and hydroelectricity energy generation using historical electricity energy production data in order to determine the future level of electricity and hydroelectricity energy generation in Turkey. For this purpose, Turkey's electricity energy sector was reviewed during the period of 1940-2005. The total electricity and hydroelectricity energy generation were then modelled using historical energy generation data as years with regression analysis. Additionally, the portion that hydroelectric energy generation of Turkey has within total electricity energy production and probable meeting capacity of Turkey's hydroelectric potential of its future total demand was determined. According to the results, it is deduced that hydropower energy will have portion of 13.6% within the total electricity energy generation in 2030. In addition, it is concluded that the whole of Turkey's technical and economical hydroelectric energy potential that is equal 129.9 billion kWh will be used in the year of 2102 if the current trend continues.
