Araştırmacılar(1)

• Oğuz, Alparslan

• ArticleYayıncıda açık erişim2026/r/ebyu/11143
  Multidimensional Sustainability Performance Measurement in the Banking Industry: A Data-Driven Grey Decision-Support Framework

  Işık, Özcan; Shabir, Mohsin; Oğuz, Alparslan; Alkan, Okan

  Given the critical role that banks play in sustainable development through their financial intermediation and capital allocation functions, assessing their sustainability performance has become an increasingly important research issue. In response, this research introduces a data-driven grey decision-support framework for assessing multidimensional sustainability performance in the banking industry. Sustainability indicators are systematically identified through text-mining-based content analysis of banks' sustainability reports and annual activity reports. The empirical analysis covers nine banks continuously included in the BIST Sustainability Index over the 2020–2024 period. To reflect temporal variability in sustainability disclosures, the assessment is formulated under grey interval numbers. Within this decision-support framework, Grey LODECI is employed to identify criterion importance, while Grey SWI is utilized to rank bank performance in terms of sustainability. This manuscript also offers useful implications for bank managers, regulators, investors, and sustainability rating agencies by supporting more comprehensive sustainability benchmarking and more informed strategic and regulatory decision-making.

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• ArticleYayıncıda açık erişim2024/r/ebyu/19873
  Analyzing Profitability Performance with the Integrated MEREC-COBRA Method: The Case of BIST Retail Companies

  Oğuz, Alparslan; Satır, Haluk

  The purpose of this study is to evaluate the financial performance of retail trade enterprises whose shares are traded on Borsa Istanbul by using profitability ratios. Within the scope of the study, the data of ten retail trade enterprises covering the period 2021-2022 were used. The weight of the performance criteria used in the study was determined by the MEREC method. COBRA method was used to determine the performance ranking among the firms. A two-stage sensitivity analysis was conducted to determine the consistency of the analysis results. In the first stage, seven different multi-criteria decision-making methods were used to rank the firms according to their performance. The consistency between the results of the study and the results of other methods was determined by Spearman correlation coefficients. In the second stage, scenarios with different criteria weights were tested. Sensitivity analysis showed that the results were stable and consistent. According to the results of the study, MIPAZ ranked first in profitability performance for both years.

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• ArticleYayıncıda açık erişim2024/r/ebyu/19690
  Drone selection for agricultural enterprises with interval TYPE-2 fuzzy copras method

  Oğuz, Alparslan

  Technological advancements have led to changes in unmanned aerial vehicles, just as in all fields. These vehicles, known as drones, are used in many areas such as mapping, logistics, entertainment, and agriculture. Especially in agriculture, drones are widely used for various purposes such as mapping, detecting weeds, fertilization, and spraying. This situation has increased the market volume of drones and many companies have introduced their products for sale. Agriculture plays a significant role in the development of developing countries, and drone technologies are of great importance in increasing sector productivity. Drone technologies provide transparency and traceability in the cultivation process of products. Therefore, the aim of the study is to determine the selection criteria of agricultural drones for agricultural enterprises and to select the most suitable alternative among the alternatives. Nine criteria were determined through literature review and expert opinion. Seven alternatives from two companies selling in Türkiye were evaluated. Alternatives were analyzed using the Interval Type-2 COPRAS method. As a result of the evaluation by three experts, alternative A2 was determined as the most suitable alternative.

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• ArticleAçık Erişim2023/r/ebyu/20099
  E-ticaret yönetiminde kullanılan dağıtım araçlarının bütünleşik crıtıc ve edas yöntemi ile seçilmesi

  Oğuz, Alparslan

  E-ticaret hacmi son yıllarda ciddi artış göstermiştir. Müşterilerin e-ticaret platformları üzerinden aldığı ürünlerin ulaştırılması işletmeler için kritik süreçlerden biridir. Bu sürecin önemli bileşenlerinden biri de kent içi dağıtımda kullanılan araçlardır. Çalışmanın amacı, çok kriterli karar verme yöntemleri ile işletmeler için kent içi dağıtım aracı seçiminin analiz edilmesidir. Bu bağlamda kent içi dağıtımda yaygın olarak kullanılan dokuz scooter model çalışmaya dahil edilmiştir. Alternatif modellerin değerlendirilmesinde sekiz objektif kriter kullanılmıştır. Kullanılan kriterlere ait ağırlıklar CRITIC yöntemi ile belirlenmiştir. Alternatifler arasında sıralama ise EDAS yöntemi ile yapılmıştır. Analizler sonucu en yüksek öneme sahip kriterin servis ücreti olduğu belirlenmiştir. Çalışmaya dokuz model katılmış ve alternatifler arasında A4 modeli ilk sırayı almıştır.

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• ArticleYayıncıda açık erişim2022/r/ebyu/20522
  Tedarik Zinciri Entegrasyonu ve Dijitalleşmenin Performansa Etkisi: Alıcı-Tedarikçi Risk Yönetiminin Aracılık Rolü

  Oğuz, Alparslan; Perçin, Selçuk

  Çalışmanın amacı, tedarik zinciri entegrasyonu ve dijitalleşmenin performansa etkisinde tedarik zinciri risk yönetiminin aracı rolünü belirlemektir. Bunun için yapısal bir model oluşturulmuştur. Yapısal modelde yer alan ilişkiler, Gaziantep Organize Sanayi Bölgelerinde faaliyet gösteren 246 üretim işletmesinden elde edilen veriler ile analiz edilmiştir. Modelde yer alan ilişkilerin belirlenmesinde Yapısal Eşitlik Modeli yöntemi kullanılmıştır. Analiz sonucunda, alıcı-tedarikçi entegrasyonu, dijitalleşme ve alıcı-tedarikçi risk yönetimi faktörlerinin işletme performansı üzerinde anlamlı bir etkiye sahip olduğu belirlenmiştir. Ayrıca, alıcı-tedarikçi entegrasyonu ve dijitalleşmenin, alıcı-tedarikçi risk yönetimi üzerinde anlamlı etkisi olduğu belirlenmiştir. Çalışmada, aracı etkilerde araştırılmıştır. Buna göre, alıcı-tedarikçi entegrasyonu ve dijitalleşmenin işletme performansına etkisinde alıcı-tedarikçi risk yönetiminin kısmi aracılık etkisi bulunmaktadır. Sonuçlar, yapısal modeli desteklemektedir. Elde edilen sonuçların literatüre, işletmelere ve yöneticilere çeşitli katkılar sağlayabileceği ifade edilebilir.

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• ArticleAçık Erişim2021/r/ebyu/14082
  Determination of heavy metals in some tissues of four fish species from the Karasu River (Erzincan, Turkey) for public consumption

  Tanlr, Özge Zencir

  The study aimed at determining the concentration of heavy metals in muscle, liver, and gill tissues of four fish species (Acanthobrama marmid, Capoeta umbla, Capoeta trutta and Chondrostoma regium) collected from five sites in the Karasu River, Erzincan, between July 2019 and January 2020. The relationships between fish size (length and weight) and metal concentrations in the tissues were also investigated using Pearson correlation analysis. Concentrations of Al, Fe, Cu, Mn and Zn were higher than those of other metals in all tissue samples from four fish species. Fe and Al concentrations were very high, while the lowest Co, Cd and Pb concentrations were determined in the muscle, liver and gill tissues. The results of Pearson correlation analysis showed that significant relationships between heavy metal concentrations and fish size (length and weight) were positive (p < 0.01, p < 0.05), except for a few cases. Furthermore, heavy metal concentrations in the edible parts (muscle) of the studied fish species did not exceed the maximum acceptable concentrations (MACs) proposed by national and international food standards and were safe within human consumption limits, except for Cr.

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• ArticleYayıncıda açık erişim2018/r/ebyu/22498
  Determination of criteria weights for the winter tourism center selection using fuzzy ahp

  Oğuz, Alparslan

  The demand for winter tourism centers in Turkey has increased in recent years and therefore, many winter tourism centers have become operational. Having numerous of winter tourism centers makes difficult the choice of those who prefer it . In this study, it is aimed to determine the factors affecting the decision of the person in terms of winter tourism center selection and rank the alternatives by determining the most suiable alternative. In the hierarchy formed by the help of literature and experts, there are 5 criteria and 19 subcriteria related to these criteria. The weights of the criteria has calculated using the Fuzzy Analytical Hierarchy Process method. Using this method, linguistic expressions can be converted into numerical expressions. According to the results obtained, the price criterion was found to be the criterion with the greatest weight. In the subcriteria, it is found that the distance of accommodation has the greatest weight considering the general weight. Finally, some proposals have been made for some limitations of the study and for future studies.

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• ArticleAçık Erişim2016/r/ebyu/16749
  Density and biomass of fish populations in Kirmir stream of Sakarya river, Turkey; [Sakarya nehri’nin Kirmir çayı’ndaki balık populasyonlarının yoğunluğu ve biyoması]

  Zencir Tanir, Özge; Korkmaz, A. Şeref

  In this study, Zippin’s triple-catch removal method was used to estimate density and biomass of fish species in Kirmir Stream of Sakarya River, Central Anatolia Turkey. A total area of 1.5256 ha was sampled and 4167 fishes were caught using electrofishing between February 2007 and November 2007. A total of 9 fish species representing 2 families Cyprinidae and Cobitidae were recorded. Fish species identified are as follows: Chub (Leuciscus cephalus Linnaeus, 1758), barbel (Barbus plebelejus escherichi Heckel, 1843), Capoeta tinca Heckel, 1843, spirlin (Alburnoides bipunctatus Bloch, 1782), Capoeta capoeta sieboldi Steindachner, 1864, tirgis-nase (Chondrostoma regium Heckel, 1843), bleak (Alburnus orontis Sauvage, 1882), spined-loach (Cobitis taenia Linnaeus, 1758) and angora-loach (Noemacheilus angorae Steindachner, 1897). A. orontis was the most dominant species, constituting 1199 fish and 28.77% of the total fishes, followed by C. tinca (1173 fish and 28.15%), B. p. escherichi (584 fish and 14.01%), L. cephalus (454 fish and 10.90%), A. bipunctatus (322 fish and 7.73%), C. regium (245 fish and 5.88 %), N. angorae (107 fish and 2.57%) C. c. sieboldi (65 fish and 1.56%) and C. taenia (18 fish and 0.43%). The density and biomass values were estimated as 11456 fish ha-1 and 346.78 kg ha-1 in February 2007, 8982 fish ha-1 and 279.82 kg ha-1 in May 2007, 6320 fish ha-1 and 251.52 kg ha-1 in August 2007 and 2887 fish ha-1 and 168.87 kg ha-1 in November 2007, respectively. The lowest density and biomass values were observed in November 2007.

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• ArticleYayıncıda açık erişim2011/r/ebyu/17216
  Seasonal variation of phytoplankton composition in a medium-size river: The Kirmir and its tributaries Ankara, Turkey

  Zencir, O.; Fakioglu, O.; Demir, N.; Korkmaz, A.S.

  The aim of this study was to determine the seasonal variation of phytoplankton in a connected river system, the Kirmir and its tributaries the Suveri and the Ilhan. The samples were collected from a total of ten selected stations on the main river and tributaries in November 2006, February, May and August 2007. A total of 57 phytoplankton species from Bacillariophyta, Chlorophyta, Chrysophyta, Cryptophyta, Cyanobacteria, Euglenophyta and Pyrrophyta were identified. Bacillariophyta species were dominant in all stations during the research period. Caloneis bacillum, Cocconeis placentula, Cyclotetta meneghiniana, Diatoma vulgare, Gomphonema ventricosum, Nitzschia sigmoidea and Ulnaria ulna appeared at high densities in the samples. The maximum phytoplankton abundance was found in the Kirmir on all sampling dates. Furthermore, some species which are indicators of pollution were found in the Kirmir.

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