Karahan, Mehmet Oğuz

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Profile URL
https://gcris.yasar.edu.tr/handle/123456789/12220
Name Variants
Job Title
Doç.Dr.
Email Address
Main Affiliation
01.01.06.04. Uluslararası Ticaret ve Finansman Bölümü
Status
Current Staff
Website
ORCID ID
0000-0003-0959-5824
Scopus Author ID
57212778785
Turkish CoHE Profile ID
Google Scholar ID
1u2ZOicAAAAJ
WoS Researcher ID
AAD-6137-2020
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mehmet.oguz.karahan.jpg (7.74 KB)

Sustainable Development Goals

NO POVERTY1
NO POVERTY
0
Research Products
ZERO HUNGER2
ZERO HUNGER
0
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GOOD HEALTH AND WELL-BEING3
GOOD HEALTH AND WELL-BEING
1
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QUALITY EDUCATION4
QUALITY EDUCATION
0
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GENDER EQUALITY5
GENDER EQUALITY
0
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CLEAN WATER AND SANITATION6
CLEAN WATER AND SANITATION
0
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AFFORDABLE AND CLEAN ENERGY7
AFFORDABLE AND CLEAN ENERGY
0
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DECENT WORK AND ECONOMIC GROWTH8
DECENT WORK AND ECONOMIC GROWTH
2
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INDUSTRY, INNOVATION AND INFRASTRUCTURE9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
1
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REDUCED INEQUALITIES10
REDUCED INEQUALITIES
0
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SUSTAINABLE CITIES AND COMMUNITIES11
SUSTAINABLE CITIES AND COMMUNITIES
0
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RESPONSIBLE CONSUMPTION AND PRODUCTION12
RESPONSIBLE CONSUMPTION AND PRODUCTION
0
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CLIMATE ACTION13
CLIMATE ACTION
0
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LIFE BELOW WATER14
LIFE BELOW WATER
0
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LIFE ON LAND15
LIFE ON LAND
0
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PEACE, JUSTICE AND STRONG INSTITUTIONS16
PEACE, JUSTICE AND STRONG INSTITUTIONS
0
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PARTNERSHIPS FOR THE GOALS17
PARTNERSHIPS FOR THE GOALS
0
Research Products
Documents

4

Citations

35

h-index

4

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Documents

7

Citations

30

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Scholarly Output

8

Articles

3

Views / Downloads

0/0

Supervised MSc Theses

5

Supervised PhD Theses

0

WoS Citation Count

10

Scopus Citation Count

18

Patents

0

Projects

0

WoS Citations per Publication

1.25

Scopus Citations per Publication

2.25

Open Access Source

3

Supervised Theses

5

JournalCount
Bogazici Journal1
Bogazici Journal: Review of Social, Economic and Administrative Studies1
International Journal of Financial Studies1
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  • Thumbnail Image
    Master Thesis
    Kurumsal yönetim ilkelerinin hisse getirilerine etkisi: Borsa İstanbul'da bir araştırma
    (2020) Temiz, Deniz; Karahan, Mehmet Oğuz
    Dünya genelinde etkisini hızla arttıran ve yatırım tercihlerine bir kıstas olarak kabul edilen kurumsal yönetim kavramı ve bu kavramın şirket performansı üzerindeki etkisi son yıllarda üzerinde birçok araştırma yapılan bir konu olmuştur. Çıkış noktası itibarı ile şirket riskini azaltmak ve yönetimsel başarısızlıkları sıfırlayarak şirketleri yatırımcıya daha cazip yatırım aracı olarak sunmayı amaçlayan kurumsal yönetim anlayışı kavram itibarı ile dünya borsalarının dengeli ve tahmin edilebilir olması, volatilitenin dengelenmesi, efektif pazar fiyatlamasının yapılabilmesi ve yatırımcı için yeterli bilgilendirmeyi sunması açısından önemli görülen bir yaklaşımdır. Bu araştırmada Borsa İstanbul'da SPK tarafından kurumsal yönetim ilkelerinin benimsenmesi ve 2007 yılında kurumsal yönetim endeksinin (XKURY) oluşturulmasından itibaren SPK tarafından yayınlanan kurumsal yönetim ilkelerine uyan ve şirketlerin hisse senedi performansı ile bağımsız denetim şirketleri tarafından yayınlanan kurumsal yönetim notu arasındaki ilişki tespit edilmeye çalışılmıştır. Bu amaçla 2008-2019 yılları arasında kurumsal yönetim notu hesaplatmış 52 BIST 100 şirketinin hisse performansı ile kurumsal yönetim final ve alt kategori notlarının ilişkileri panel veri yöntemiyle analiz edilmiştir. Analizde aynı dönem içindeki BIST 100, XKURY endeksi performansları ve A.B.D. Doları kurundaki değişim kontrol değişkenleri olarak kullanılmıştır. Analizde aynı dönem içindeki BIST 100, XKURY endeksi performansları, kur değişimi kontrol değişkenleri olarak kullanılmıştır. Veri analizi sonucunda şirketlerin aldığı kurumsal yönetim final notu ve kamuyu aydınlatma & şeffaflık, yönetim kurulu ve pay sahibi alt kategorilerinde herhangi bir anlamlılık tespit edilememiş, menfaat sahipleri alt kategorisindeki puan artışı ile şirketlerin hisse getiri artışı arasında ise olumlu yönde bir anlamlılık tespit edilmiştir.
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    Review
    Citation - Scopus: 4
    Forecasting daily residential natural gas consumption: A dynamic temperature modelling approach
    (Bogazici Universitesi bjournal@boun.edu.tr, 2019) Ahmet Göncü; Mehmet Oğuz Karahan; Tolga Umut Kuzubaş; Kuzubaş, Tolga Umut; Karahan, Mehmet Oğuz; Göncü, Ahmet
    In this paper we propose a new methodology to forecast residential and commercial natural gas consumption which combines natural gas demand estimation with a stochastic temperature model. We model demand and temperature processes separately and derive the distribution of natural gas consumption conditional on temperature. Natural gas consumption and local temperature processes are estimated using daily data on natural gas consumption and temperature for Istanbul Turkey. First using the derived conditional distribution of the natural gas consumption we obtain confidence intervals of point forecasts. Second we forecast natural gas consumption by using temperature and consumption paths generated by Monte Carlo simulations. We evaluate the forecast performance of different model specifications by comparing the realized consumption values with the model forecasts by backtesting method. We utilize our analytical solution to establish a relationship between the traded temperature-based weather derivatives i.e. HDD/CDD futures and expected natural gas consumption. This relationship allows for partial hedging of the demand risk faced by the natural gas suppliers via traded weather derivatives. © 2020 Elsevier B.V. All rights reserved.
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    Master Thesis
    Hoshin Kanri sisteminin şirket karlılığına etkisi: Metal üretim sektörü üzerine bir vaka analizi
    (2020) Topaç, Sezgin; Karahan, Mehmet Oğuz
    Hoshin Kanri is a methodology that was developed in Japan in the late 1960s. Now, it has become an essential component in numerous institutions that are implementing new management systems and concepts such as Balanced Scorecard (BSC), TQM, and Lean Management or Six Sigma. Hoshin Kanri is a management method used for reinforcing strategic work. The aim of the study is to make a positive contribution to the company's current financial turnover with the hoshin kanri methodology. Another purpose is; to implement the strategies determined in this process and to direct all departments within the company from the top to the bottom towards these targets. As a result of the analyzes, it has been observed that the cost items determined by the company have positive effects on the profitability of the Hoshin Kanri system, which is used to connect to the performance indicators, to spread to the teams and to align the departments.
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    Master Thesis
    An Analysis on the Effect of Stock Split Announcements on Stock Returns in Borsa İstanbul
    (2019) Gürler, Buğrahan; Celen, Remzi Cihan; Karahan, Mehmet Oğuz
    In this study, the effects of the announcements of stock splits to stock returns in Borsa İstanbul between 2015-2017 are analyzed using event study methodology. For the analysis, the event window is determined as 5 days before and 5 days after the announcement of the stock splits. The findings of the research suggests that it is not possible to obtain statistically significant abnormal returns after the announcements. Consistent with semi-strong form efficiency, statistically significant abnormal returns are observed only in announcement date. Additionally, statistically significant cumulative abnormal returns are observed on the day of and after the announcement.
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    Master Thesis
    Borsa İstanbul'da firma büyüklüğü etki analizi
    (2021) Erdoğan, Melisa; Karahan, Mehmet Oğuz
    Bu çalışmada, 01/03/2011 - 30/09/2020 tarihleri arasında Borsa İstanbul'un BIST endekslerinde yer alan 331 firmanın hisse senedi getirilerindeki firma büyüklüğü anomalisi panel veri analizi kullanılarak analiz edilmiştir. Çalışmada bağımlı değişken olarak hisse senetlerinin getiri fazlası kullanılmıştır. Bağımsız değişken olarak piyasa değeri, Piyasa Defter Değeri oranı, halka açıklık oranı, hisse başına kazanç, piyasa fazla getirisi ve 10 yıllık Türkiye tahvil getirisi verileri kullanılmıştır. Panel veri analizi sonuçları, Borsa İstanbul BISTTÜM endeksinde yer alan hisse senetleri için piyasa kapitalizasyonunun hisse senedi getirilerini olumlu etkilediğini göstermektedir. Ancak bu olumlu etkinin BIST100 endeksinde yer alan hisse senetleri için daha düşük olduğu görülmektedir.
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    Master Thesis
    Global finansal krizin BİST 50 şirketlerinin sermaye yapıları etkileri üzerine bir inceleme
    (2020) Öztaşkan, Berk; Karahan, Mehmet Oğuz
    In this study, the consequences of international capital flows which ocurred after the 2008 global financial crisis, due to the unconventional monetary policies were implemented by four major Central Banks which is the European Central Bank (ECB), the Federal Reserve of America (FED), the Bank of England (BOE) and the Bank of Japan (BOJ) and the Central Bank of the Republic of Turkey, on capital structures of non-financial firms listed on Borsa Istanbul BIST50 index. In the study, the factor which effect the long-term financial leverage ratios of 40 non-financial firms which are included in BIST50 index are examined by a panel regression model. Findings indicate that changes in the foreign exchange rates have significant effects on long-term financial leverage ratios. Keywords: Capital structure theories, Quantitative Easing (QE), BIST50, Financial Leverage Ratio
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    Article
    Citation - WoS: 10
    Citation - Scopus: 14
    Exploring Online Payment System Adoption Factors in the Age of COVID-19—Evidence from the Turkish Banking Industry
    (MDPI, 2022) Melih Coskun; Ebru E. Saygılı; Mehmet Oğuz Karahan; Karahan, Mehmet Oguz; Coskun, Melih; Saygili, Ebru
    Turkey’s e-commerce market is rapidly expanding and the country is ranked first in the world in monthly mobile purchases. The purpose of this study is to determine the factors that influence the adoption of online payments systems among the customers of a Turkish bank during the COVID-19 pandemic. The research model extends the technology acceptance model (TAM) by further examining the impact of 11 factors on attitude behavioral intention and actual usage. The results suggest a strong influence of these factors on attitude and behavioral intention. Relative advantage perceived trust perceived usefulness personal innovativeness perceived integrity perceived ease of use health and epidemic effects income private sector employment and self-employment all have a positive effect on actual online payment system usage. However perceived risk and age have a negative impact on the actual online payment system usage. © 2022 Elsevier B.V. All rights reserved.
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    Article
    Forecasting Daily Residential Natural Gas Consumption: A Dynamic Temperature Modelling Approach
    (2019) Kuzubaş, Tolga Umut; Karahan, Mehmet Oğuz; Goncu, Ahmet
    In this paper, we propose a new methodology to forecast residential and commercial natural gas consumption which combines natural gas demand estimation with a stochastic temperature model. We model demand and temperature processes separately and derive the distribution of natural gas consumption conditional on temperature. Natural gas consumption and local temperature processes are estimated using daily data on natural gas consumption and temperature for Istanbul, Turkey. First, using the derived conditional distribution of natural gas consumption we obtain confidence intervals of point forecasts. Second, we forecast natural gas consumption by using temperature and consumption paths generated by Monte Carlo simulations. We evaluate the forecast performance of different model specifications by comparing the realized consumption values with the model forecasts by the backtesting method. Our analysis establishes a relationship between the traded temperature-based weather derivatives, i.e. HDD/CDD futures, and expected natural gas consumption. This relationship allows for partial hedging of the demand risk faced by natural gas suppliers via traded weather derivatives.