Prof. Dr. AYŞE SEVTAP KESTEL

HACETTEPE JOURNAL OF MATHEMATICS AND STATISTICS , cilt.1, sa.1, ss.1-20, 2022 (SCI-Expanded, Scopus, TRDizin)

17. Optimal premium allocation under stop-loss insurance using exposure curves

Yilmaz B., Hekimoglu A. A., Kestel A. S.

HACETTEPE JOURNAL OF MATHEMATICS AND STATISTICS , cilt.51, sa.1, ss.288-307, 2022 (SCI-Expanded, Scopus, TRDizin)

18. Default and prepayment options pricing and default probability valuation under VG model

JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS , cilt.399, 2022 (SCI-Expanded, Scopus) Sürdürülebilir Kalkınma

19. Assessment of longevity risk: credibility approach

Kulekci B. Y., Kestel A. S.

JOURNAL OF APPLIED STATISTICS , cilt.48, sa.13-15, ss.2695-2713, 2021 (SCI-Expanded, Scopus)

20. CD-vine model for capturing complex dependence

Ozan Evkaya O., Yozgatlıgil C., Kestel S. A.

JOURNAL OF APPLIED STATISTICS , cilt.48, sa.13-15, ss.2406-2420, 2021 (SCI-Expanded, Scopus)

21. The Impact of Macro-Economic Drivers in Housing Markets: The US Cas

YILMAZ B., YERLİKAYA ÖZKURT F., KESTEL A. S.

İzmir Journal of Economics , cilt.36, sa.2, ss.259-273, 2021 (TRDizin)

22. Time dependent stop-loss reinsurance and exposure curves

Yılmaz B., Yerlikaya Özkurt F., Kestel A. S.

JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS , cilt.389, 2021 (SCI-Expanded, Scopus)

23. Forecasting house prices in Turkey: GLM, VAR and time series approaches

Journal of Business Economics and Finance , cilt.9, sa.4, ss.274-291, 2020 (Hakemli Dergi)

24. FORECASTING MORTALITY RATES WITH A GENERAL STOCHASTIC MORTALITY TREND MODEL

HASGÜL E., Kestel A. S., YOLCU OKUR Y.

COMMUNICATIONS FACULTY OF SCIENCES UNIVERSITY OF ANKARA-SERIES A1 MATHEMATICS AND STATISTICS , cilt.69, sa.1, ss.910-928, 2020 (ESCI, TRDizin) Sürdürülebilir Kalkınma

25. Computation of Hedging Coefficients for Mortgage Default and Prepayment Options: Malliavin Calculus Approach

Yılmaz B., Selcuk-Kestel A. S.

JOURNAL OF REAL ESTATE FINANCE AND ECONOMICS , cilt.59, sa.4, ss.673-697, 2019 (SSCI, Scopus)

26. The estimation of adopted mortality and morbidity rates using model and the phase type law: the Turkish case

Akat F., Selcuk-Kestel A. S., Tank F.

Communications in Statistics: Simulation and Computation , cilt.48, sa.9, ss.2552-2565, 2019 (SCI-Expanded, Scopus)

27. Drought analysis using copula approach: a case study for Turkey

Evkaya Ö. O., Yozgatlıgil C., Kestel A. S.

Communications in Statistics Case Studies Data Analysis and Applications , cilt.5, sa.3, ss.243-260, 2019 (Scopus) Sürdürülebilir Kalkınma

28. Quantitative hazard assessment for Zonguldak Coal Basin underground mines

Erdogan H. H., Duzgun H. S., Selcuk-Kestel A. S.

INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY , cilt.29, sa.3, ss.453-467, 2019 (SCI-Expanded, ESCI, Scopus) Sürdürülebilir Kalkınma

29. ASSESSMENT OF SUPPLIER RISK FOR COPPER PROCUREMENT

Buzdogan-Lindenmayr E., Kara G., Selcuk-Kestel A. S.

COMMUNICATIONS FACULTY OF SCIENCES UNIVERSITY OF ANKARA-SERIES A1 MATHEMATICS AND STATISTICS , cilt.68, sa.1, ss.1045-1060, 2019 (ESCI, TRDizin)

30. AGGREGATE CLAIM ESTIMATION USING BIVARIATE HIDDEN MARKOV MODEL

Oflaz Z. N., Yozgatlıgil C., Selcuk-Kestel A. S.

ASTIN BULLETIN , cilt.49, sa.1, ss.189-215, 2019 (SCI-Expanded, SSCI, Scopus)

31. Measuring Dependence Between Electricity Consumption And Contributing Indicators Via Copulas: Turkish Case

Yilmaz B., Selcuk-Kestel A. S.

Gazi University Journal of Science , cilt.31, sa.4, ss.1284-1296, 2018 (Scopus, TRDizin) Sürdürülebilir Kalkınma

32. A STOCHASTIC APPROACH TO MODEL HOUSING MARKETS: THE US HOUSING MARKET CASE

NUMERICAL ALGEBRA CONTROL AND OPTIMIZATION , cilt.8, sa.4, ss.481-492, 2018 (ESCI, Scopus)

33. Constant proportion portfolio insurance in defined contribution pension plan management

Temoçin B. Z., Korn R., Selcuk-Kestel A. S.

ANNALS OF OPERATIONS RESEARCH , cilt.266, ss.329-348, 2018 (SCI-Expanded, Scopus)

34. Preface: Advances of OR in commodities and financial modelling

KESTEL S. A., Yolcu-Okur Y., Weber G.

ANNALS OF OPERATIONS RESEARCH , cilt.260, ss.1-2, 2018 (SCI-Expanded, Scopus)

35. Measuring Dependence between Electricity Consumption and Economic Indicators via Copulas: Turkish Case

Evkaya O. O., Yozgatlıgil C., Selcuk-Kestel A. S.

GAZI UNIVERSITY JOURNAL OF SCIENCE , cilt.31, sa.4, ss.1284-1296, 2018 (ESCI, Scopus, TRDizin) Sürdürülebilir Kalkınma

36. Constant proportion portfolio insurance in defined contribution pension plan management under discrete-time trading

Temoçin B. Z., Korn R., Selcuk-Kestel A. S.

ANNALS OF OPERATIONS RESEARCH , cilt.260, ss.515-544, 2018 (SCI-Expanded, Scopus)

37. Diversification benefit and return performance of REITs using CAPM and Fama-French: Evidence from Turkey

Coskun Y., Selcuk-Kestel A. S., Yılmaz B.

BORSA ISTANBUL REVIEW , cilt.17, sa.4, ss.199-215, 2017 (SSCI, ESCI, Scopus)

38. Analysis of training sample selection strategies for regression-based quantitative landslide susceptibility mapping methods

Erener A., Sivas A. A., Kestel S. A., Duzgun H. S.

COMPUTERS & GEOSCIENCES , cilt.104, ss.62-74, 2017 (SCI-Expanded, Scopus)

39. Assessment of Index-based Drought Insurance

Evkaya Ö. O., Yıldırak Ş. K., Kestel A. S.

Ekonomik Yaklaşım , cilt.28, ss.1-18, 2017 (Hakemli Dergi) Sürdürülebilir Kalkınma

40. Analyses on the Causality in Carbon Emission with respect to Economic Growth and Education

ÜNLÜ K. D., KESTEL A. S.

GAZI UNIVERSITY JOURNAL OF SCIENCE , cilt.30, sa.3, ss.161-179, 2017 (ESCI, Scopus) Sürdürülebilir Kalkınma

41. Simulation of large earthquakes and its implications on earthquake insurance rates: a case study in Bursa region (Turkey)

Ünal B., Askan A., Selcuk-Kestel A. S.

NATURAL HAZARDS , cilt.85, sa.1, ss.215-236, 2017 (SCI-Expanded, Scopus)

42. The impact of crude oil prices on financial market indicators: copula approach

Kayalar D. E., Küçüközmen C. Ç., Kestel S. A.

ENERGY ECONOMICS , cilt.61, ss.162-173, 2017 (SSCI, Scopus) Sürdürülebilir Kalkınma

43. Estimation of earthquake insurance Premium rates Turkish catastrophe insurance pool case

Temoçin B. Z., Kestel A. S.

AÜÜF Communications: Series A1: Mathematics and Statistics , cilt.65, ss.161-173, 2016 (Hakemli Dergi)

44. Adjusting SPI for crop specific agricultural drought

Yıldırak Ş. K., Kestel A. S.

ENVIRONMENTAL AND ECOLOGICAL STATISTICS , cilt.22, sa.4, ss.681-691, 2015 (SCI-Expanded, Scopus) Sürdürülebilir Kalkınma

45. Analysis of portfolio diversification between REIT assets

Rees P., Selcuk-Kestel A. S.

JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS , cilt.259, ss.425-433, 2014 (SCI-Expanded, Scopus)

46. A GIS-based software for lifeline reliability analysis under seismic hazard

Kestel A. S., Düzgün H. Ş., Oduncuoğlu L.

COMPUTERS & GEOSCIENCES , cilt.42, ss.37-46, 2012 (SCI-Expanded, Scopus)

47. Stochastic modeling of accident risks associated with an underground coal mine in Turkey

Sari M., Selcuk A. S., Karpuz C., Duzgun H. S. B.

SAFETY SCIENCE , cilt.47, ss.78-87, 2009 (SCI-Expanded, Scopus) Sürdürülebilir Kalkınma

48. Length biased Inverse Gaussian Hazard Rate Estimation A Predictive Density Approach

Akman O., Kestel A. S.

Advances and Applications in Statistics , cilt.6, ss.217-233, 2006 (ESCI)

49. Accident analysis of two Turkish underground coal mines

Sarı M., Duzgun H., Karpuz C., Selcuk A.

SAFETY SCIENCE , cilt.42, ss.675-690, 2004 (SCI-Expanded, Scopus) Sürdürülebilir Kalkınma

50. Compulsory Earthquake Insurance Scheme for Residences In Turkey And Its Implications

Kestel A. S., Gülkan H. P.

Journal of International Insurance , cilt.1, ss.447-457, 2001 (Hakemli Dergi)

51. Nonnormal regression. II. Symmetric distributions

Tiku M., Islam M., Selcuk A.

COMMUNICATIONS IN STATISTICS-THEORY AND METHODS , cilt.30, sa.6, ss.1021-1045, 2001 (SCI-Expanded, Scopus)

52. Reliability of lifeline networks with multiple sources under seismic hazard

Kestel A. S., Yucemen M. S.

NATURAL HAZARDS , cilt.21, sa.1, ss.1-18, 2000 (SCI-Expanded, Scopus)

53. Reliability of Lifeline Networks under Seismic Hazard

Kestel A. S., Yucemen M. S.

Reliability Engineering Safety , cilt.65, ss.213-227, 1999 (SCI-Expanded, Scopus)

54. The Turkish Insurance Market Land of Opportunity

KESTEL A. S.

Journal of International Insurance , cilt.1, ss.77-90, 1999 (Hakemli Dergi)

Hakemli Bilimsel Toplantılarda Yayımlanmış Bildiriler 74

1. Spatio-temporal crop yield prediction using time-varying copula and actuaries climate index

Yavrum C., Kestel A. S., Garrido J.

Climate Change and Insurance 2025, Edinburgh, İngiltere, 10 - 12 Eylül 2025, ss.1, (Özet Bildiri)

2. Insurance Fraud Detection via Clustering-Based Fuzzy Classification On Noisy Unbalanced Datasets

Koç O., Başer F., Kestel A. S.

the European Actuarial Journal Conference (EAJC) 2024, Lisbon, Portekiz, 9 - 11 Eylül 2024, ss.28-29, (Özet Bildiri)

3. Assessing the applicability of the Actuaries Climate Index within weather derivatives framework

Yavrum C., Kestel A. S.

Workshop "Climate Change and Insurance", Vienna, Avusturya, 4 - 06 Eylül 2024, ss.19, (Özet Bildiri)

4. Stop-loss reinsurance pricing and exposure curves under jump influence

Familly Workshop (Financial and Actuarial Mathematics in Liverpoold, Leeds, York), Liverpool, İngiltere, 07 Aralık 2023, ss.1, (Özet Bildiri)

5. TIME DEPENDENT STOP-LOSS REIUNSURANCE AND EXPOSURE CURVES VIA STOCHASTIC JUMP DIFFUSION

AKARSU ŞENGÖZ G., KESTEL A. S.

26th International Congress on Insurance: Mathematics and Economics, Edinburgh, Saint Helena, 4 - 07 Temmuz 2023, ss.86, (Özet Bildiri)

6. Time Varying Approach to Stochastic Reserve Prediction

26th International Congress on Insurance: Mathematics and Economics, Edinburgh, Saint Helena, 4 - 07 Temmuz 2023, ss.13, (Özet Bildiri)

7. Life Insurance Valuation under Pandemic Risks: Covid-19

Yavrum C., Kestel A. S.

26th International Congress on Insurance: Mathematics and Economics, Edinburgh, İngiltere, 4 - 07 Temmuz 2023, ss.144, (Özet Bildiri)

8. Optimal Dynamic Ruin Probabilities for Heavy-Tailed Losses Under Reinsurance Strategies

Yildirim Külekci B., Korn R., Kestel A. S.

25th (2022) International Congress on Insurance: Mathematics and Economics, Guangzhou, Çin, 12 - 15 Temmuz 2022, cilt.1, ss.114, (Özet Bildiri)

9. Ruin Probability in Heavy-Tailed Claims with Extreme Value Theory

Yildirim Külekci B., Karabey U., Kestel A. S.

24th International Congress on Insurance: Mathematics and Economics, Illinois, Amerika Birleşik Devletleri, 5 - 09 Eylül 2021, cilt.1, sa.1, ss.101, (Özet Bildiri)

10. Time Dependent Stop-Loss Reinsurance and Exposure Curves

Virtual 24th International Congress on Insurance: Mathematics and Economics, Illinois, Amerika Birleşik Devletleri, 5 - 09 Temmuz 2021, ss.145-146, (Özet Bildiri)

11. Impact of Outliers in Mortality Rates on the Valuation of Life Annuities

Yavrum C., Kestel A. S.

Virtual 24th International Congress on Insurance: Mathmeatics and Economics, Illinois, Amerika Birleşik Devletleri, 5 - 09 Temmuz 2021, ss.174, (Özet Bildiri)

12. Time Dependent Stop-Loss Reinsurance and Exposure Curves

Yildirim Külekci B., Kestel A. S., Karabey U.

Virtual 24th International Congress on Insurance: Mathematics and Economics, Amerika Birleşik Devletleri, 05 Temmuz 2021, (Özet Bildiri)

13. Backtesting in Time Varying Extreme Value Copulas for Dependent Risks

Online International Conference inActuarial Science (OICA), Lyon, Fransa, 28 - 29 Nisan 2020, (Özet Bildiri)

14. Assessment of Longevity Risk on PensionFunds: Credibility Approach

YILDIRIM KÜLEKCİ B., KESTEL A. S.

11th International Statistics Congress (ISC11), Bodrum, Türkiye, 4 - 08 Ekim 2019, (Özet Bildiri)

15. Exposure Curve for the Sum of Dependent Risks

AKARSU G., Centeno M. d. L., KESTEL A. S.

23.International Congress on Insurance: Mathematics and Economics, Munich, Almanya, 10 - 12 Temmuz 2019, ss.58, (Özet Bildiri)

16. Ischemic Heart Disease Morbidity Rates Estimation using Hidden Markov Model Regression

Oflaz Z., Yozgatlıgil C., Kestel S. A.

23rd International Congress on Insurance: Mathematics and Economics (IME), Munich, Almanya, 10 Temmuz 2019, ss.53, (Özet Bildiri)

17. Ischemic heart disease mortality rate estimation using hidden markov regression model

OFLAZ Z., KESTEL A. S., YOZGATLIGİL C.

23rd International Congress on Insurance: Mathematics and Economics (IME 2019), Munich, Almanya, 10 - 12 Temmuz 2019, (Özet Bildiri)

18. Risk Classification with Artificial Neural Networks Models in Motor Third Party Liability

YILDIRAK Ş. K., KESTEL A. S., GÜR İ.

International Conference on Data Science, Machine Learning and Statistics - 2019(DMS-2019), Van, Türkiye, 26 - 29 Haziran 2019, (Özet Bildiri)

19. Assessment of Longevity Risk via CredibilityApproach

YILDIRIM KÜLEKCİ B., KESTEL A. S.

4th National Insurance and Actuarial Sciences Congress (USAK), Ankara, Türkiye, 24 - 25 Haziran 2019, (Özet Bildiri)

20. Single-Family Houses Portfolio Optimization under Impact of Large Investors in Housing Markets

Yılmaz B., Korn R., Kestel S. A.

9th General AMaMeF Conference, Paris, Fransa, 11 - 14 Haziran 2019, ss.54-55, (Özet Bildiri)

21. Hydro Inflow Forecasting and Virtual Power Plant Pricing in the Turkish Electricity market

Çabuk S., Kestel S. A., Kalaycı E.

7th Multinational Energy and Value Conference, Ankara, Türkiye, 23 - 25 Mayıs 2019, ss.13, (Özet Bildiri)

22. Analyzing Housing Market Dynamics using Linear and non-Parametric Models

YILMAZ B., YERLİKAYA ÖZKURT F., KESTEL A. S.

11. International Statistics Days Conference, Muğla, Türkiye, 3 - 07 Ekim 2018, (Özet Bildiri)

23. Extreme Value Theory on Valuation of Actuarial Risk

YILDIRIM KÜLEKCİ B., KESTEL A. S., KARABEY U.

11. International Statistics Days Conference, BODRUM, Türkiye, 3 - 07 Ekim 2018, (Özet Bildiri)

24. Understanding Drought with Copula Functions: Case Study for Konya Province

11. International Statistics Days Conference, Muğla, Türkiye, 3 - 07 Ekim 2018, ss.300, (Özet Bildiri) Sürdürülebilir Kalkınma

25. Default and Prepayment Risk Management Using Option Based Mortgage Contract PricingMethod

YILDIRIM KÜLEKCİ B., KESTEL A. S., KARABEY U.

4th European Actuarial Journal Conference, Leuven, Belçika, 9 - 11 Eylül 2018, ss.71, (Özet Bildiri)

26. Multivariate Extreme Value Theory on the Valuation of Tail Behavior in Actuarial Science

4th European Actuarial Journal Conference, Leuven, Belçika, 9 - 11 Eylül 2018, (Özet Bildiri)

27. Optimal Stop-Loss Reinsurance: A Dependence Analysis of Aggregate Claims under Certain Distributions

Oflaz Z., Yozgatlıgil C., Kestel S. A.

4th European Actuarial Journal Conference, Leuven, Belçika, 9 - 11 Eylül 2018, ss.61, (Özet Bildiri)

28. Data sharing under confidentiality

Başer E., Hülagu T., Akyıldız E., Bilgen A., Cenk M., Keskinkurt-Paksoy İ., et al.

Ninth IFC Conference , Basel, İsviçre, 30 - 31 Ağustos 2018, ss.1057-1072, (Tam Metin Bildiri)

29. Estimation Of Claim Amounts Using Bivariate Hidden Markov Models

31. International Congress of Actuaries, Berlin, Almanya, 3 - 08 Haziran 2018, ss.121, (Özet Bildiri)

30. Drought Forecasting with Time Series and Machine Learning Approaches

10.International Statistics Congress (ISC2017), Ankara, Türkiye, 6 - 08 Aralık 2017, ss.200, (Özet Bildiri) Sürdürülebilir Kalkınma

31. Dependence Analysis with Normally Distributed Aggregate Claims in Stop Loss Insurance

YILDIRIM B., KESTEL A. S., KARABEY U.

10th Internatioanal Statistics Congress (ISC2017) Ankara, Ankara, Türkiye, 6 - 08 Aralık 2017, (Özet Bildiri)

32. Risk Measurement Using Extreme Value Theory: The Case of BIST100 Index

10th International Statistics Congress, Ankara, Türkiye, 6 - 08 Aralık 2017, (Özet Bildiri)

33. Stochastic risk assessment of an insurance portfolio underrenewal process with VaR and CVaR as initial capital

ŞİMŞEK M., UĞUR Ö., KESTEL A. S.

2nd International Conference on Computational Finance, 4 - 08 Eylül 2017, (Özet Bildiri)

34. Finite Mixture of C-vines for Complex Dependence.

20th Europen Young Statistician Meeting, Uppsala, İsviçre, 14 - 18 Ağustos 2017, (Tam Metin Bildiri)

35. Multivariate Analysis of Drought Characteristics using Vine Copula Approach.

Copulas and Their Applications to Commemorate the 75th Birthday of Professor Roger B. Nelsen, Almeria, İspanya, 3 - 05 Temmuz 2017, (Özet Bildiri) Sürdürülebilir Kalkınma

36. Determination of Sensitivities for Mortgage Default and Prepayment Options

8th General AMaMeF Conference, Amsterdam, Hollanda, 19 - 23 Haziran 2017, ss.58, (Özet Bildiri)

37. The Effect of Macro-Economic Factors on Housing Markets: US Case

YILDIRIM B., KESTEL A. S.

IRSYSC 2017 – 3RD INTERNATIONAL RESEARCHERS, STATISTICIANS AND YOUNG STATISTICIANS CONGRESS, Konya, Türkiye, 24 - 26 Mayıs 2017, ss.228, (Özet Bildiri)

38. The Influence of Longevity Risk on Pension Funds: Turkish Case

3RD INTERNATIONAL RESEARCHERS, STATISTICIANS AND YOUNG STATISTICIANS CONGRESS, Konya, Türkiye, 24 - 26 Mayıs 2017, (Özet Bildiri)

39. Mixture of Vine Copulas for Complex and Hidden Dependence

HASGÜL E., KESTEL A. S., YOLCU OKUR Y.

Recent Developments in Dependence Modeling and Applications in Finance and Insurance, Island of Aegina, Yunanistan, 22 - 23 Mayıs 2017, (Özet Bildiri)

40. An Alternative Stochastic Mortality Trend Model

PARTY 2017, 8 - 13 Ocak 2017, (Özet Bildiri)

41. Actuarial present value and variance for changing mortality and stochastic interest rates

Yıldırım B., Selcuk-Kestel A. S., Coşkun-Ergökmen N. G.

3rd International Conference on Dynamics, Games and Science, DGS 2014, Porto, Portekiz, 17 - 21 Şubat 2014, cilt.195, ss.495-512, (Tam Metin Bildiri)

42. DIVERSIFICATION BENEFIT AND RETURN PERFORMANCE OFREITS USING CAPM AND FAMA FRENCH EVIDENCES FROM TURKEY

YILMAZ B., COŞKUN Y., KESTEL A. S.

2ND INTERNATIONAL CONFERENCE on Applied Economics and Finance, Girne, Kıbrıs (Kktc), 5 - 06 Aralık 2016, (Özet Bildiri)

43. A Stochastic Model Approach to Determine the Pattern in House Prices

ŞİMŞEK M., UĞUR Ö., KESTEL A. S.

Vienna Congress on Mathematical Finance - VCMF 2016, Viyana, Avusturya, 12 - 14 Eylül 2016, (Özet Bildiri)

44. Ruin Analysis of Takaful Insurance Using Multiple Threshold Model

ACHLAK A., KESTEL A. S., TANK F.

3rd European Actuarial Association Conference, Lyon, Fransa, 4 - 08 Eylül 2016, (Özet Bildiri)

45. Stochastic surplus process and constrained portfolio optimization with VaR and CVaR

3. European Actuarial Journal Conference, Lyon, Fransa, 4 - 08 Eylül 2016, (Özet Bildiri)

46. Stochastic Surplus Process and Constrained Portfolio Optimisation with VaR and CVaR

ŞİMŞEK M., UĞUR Ö., KESTEL A. S.

EAJ 2016 & IA Summer School, 5 - 08 Temmuz 2016, (Özet Bildiri)

47. Assessment of Multivariate Drought Index via Vine Copula

Dependence Modeling inFinance, Insurance and Environmental Science, Munich, Almanya, 17 - 19 Mayıs 2016, (Özet Bildiri) Sürdürülebilir Kalkınma

48. Determination of Nonlinear Dependency on Solvency II Requirements using Copulas

HASGÜL E., KESTEL A. S.

Dependence Modeling in Finance, Insurance and Environmental Science, 17 - 19 Mayıs 2016, (Özet Bildiri)

49. FUZZY CLUSTERING FOR EARTHQUAKE INSURANCE RISK ASSESSMENT

BAŞER F., KESTEL A. S., APAYDIN A.

International 9. Statistics Congress, Antalya, Türkiye, 27 Ekim - 01 Kasım 2015, (Özet Bildiri)

50. Energy ConsumptionAnd Economic Growthİn Turkey Is CopulaFramework Possible