Rektörlük
Bu koleksiyon için kalıcı URI
Güncel Gönderiler
Öğe İş yaşamında gelecek zaman algısının demografik analizi: Artvin örneği(Türk Kooperatifçilik Kurumu, 2025) Öztürk, Tayfun; Dinç, ErtanBu çalışma, İş Yaşamında Gelecek Zaman Algısı’nın (İGZA) demografik değişkenlere göre nasıl farklılık gösterdiğini analiz etmeyi amaçlamaktadır. İGZA, bireylerin iş yaşamlarında geleceğe dair kalan zamanlarına yönelik algılarını, bu algıların kariyer hedefleri, motivasyonları ve davranışları üzerindeki etkileriyle birlikte ele almaktadır. Araştırma, Artvin ilinde çeşitli sektörlerde çalışan 334 pazarlama ve satış personeliyle gerçekleştirilmiştir. Veriler, Zacher ve Frese (2009) tarafından geliştirilmiş ve Türkçe uyarlaması daha önceki bir çalışmada (Birincioğlu, 2024) yapılmış olan İGZA ölçeği ile toplanmış; bağımsız örneklem t-testi ve tek yönlü varyans analizi (ANOVA) yoluyla analiz edilmiştir. İGZA’nın üç alt boyutu olan fırsatlara odaklanma, kısıtlara odaklanma ve algılanan kalan süre, katılımcıların cinsiyet, yaş, medeni durum ve kıdem sürelerine göre incelenmiştir. Bulgular, yalnızca algılanan kalan süre boyutunda anlamlı farklılıklar ortaya koymuş; genç, bekâr ve kıdemsiz çalışanların iş yaşamında kendilerine daha uzun süre kaldığını düşündükleri belirlenmiştir. Buna karşılık, fırsatlara ve kısıtlara odaklanma boyutlarında demografik temelli anlamlı bir ayrışma gözlenmemiştir. Sonuçlar, kariyer planlamasında bireylerin zaman algılarının yaş, sosyal roller ve kurumsal deneyimle şekillendiğini göstermekte; insan kaynakları stratejilerinin bu değişkenleri dikkate alması gerektiğini ortaya koymaktadır.Öğe Kırım’dan Tekfurdağı’na: 1860-1863 yılları arasında göç ve iskân(Serkan Yazici, 2025) Turan, MahmutKırım Savaşı’nın ardından Rus İmparatorluğu tarafından Kırım ve Kuzey Kafkasya’da uygulanan baskı ve zorunlu iskân politikaları, bölgedeki Müslüman nüfusu kitlesel göçe zorladı. Bu göç dalgası ile birlikte Osmanlı Devleti ciddi bir demografik hareketlilikle karşı karşıya bırakıldı. Bu çerçevede Tekfurdağı sancağı, Kırım’dan gelen muhacirler için önemli bir iskân merkezi olarak ön plana çıkmaktaydı. Göç ve iskân süreci, muhacirlerin arazi edinme, konut inşa etme ve tarımsal üretime katılma gibi temel alanlarda karşılaştıkları çeşitli zorluklar doğrultusunda şekillenmiştir. Devletin merkezi iskân politikaları, muhacirlerin akraba ve kabileleriyle birlikte yerleşme istekleriyle her zaman örtüşmedi. Bu durum, muhacirlerle devlet yetkilileri arasında zaman zaman anlaşmazlıklara neden oldu. Yerel idarenin ve halkın sınırlı ekonomik kaynaklara rağmen muhacirlere karşı gösterdiği dayanışma ve destek, muhacirlerin temel ihtiyaçlarının karşılanmasında belirleyici oldu. Ancak uzun süren barınma, iskân ve geçim sorunları, sürecin etkinliğini önemli ölçüde sınırlandırdı. Bu çalışma, 1860-1863 yılları arasında Tekfurdağı’na yönelik göç ve iskân süreçlerini arşiv belgeleri ve birincil kaynaklar ışığında incelemekte; muhacir yerleştirme politikalarının yerel düzeydeki uygulanış biçimlerini, karşılaşılan idarî ve iktisadî güçlükleri, muhacir topluluklarının adaptasyon dinamiklerini ve devlet-muhacir-halk ilişkilerini analitik bir yaklaşımla ele almaktadır. Böylelikle, Osmanlı muhacir siyasetinin yalnızca merkezî düzenlemelerden ibaret olmayıp taşra idaresinin imkân ve sınırlarıyla, ayrıca muhacirlerin kendi sosyal ağları ve talepleriyle nasıl şekillendiği ortaya konulmaya çalışılacaktır.Öğe Çıkar bağlılığının örgüt yararına etik olmayan davranışlar üzerindeki etkisi: Statü arzusu ve lider-üye etkileşiminin rolü(Karadeniz Teknik Üniversitesi, 2025) Dinç, Ertan; Birincioğlu, NihanBu çalışmada çıkar bağlılığının örgüt yararına etik olmayan davranışlara etkisinde statü arzusu (makyavelizm) ve lider-üye etkileşiminin etkileşmiş aracı etkisinin ortaya koyulması amaçlanmaktadır. Araştırmanın teorik altyapısı, sosyal mübadele kuramına dayanmaktadır. Bu çalışma, çalışmanın amacına uygun olarak nicel araştırma yöntemi ile yürütülmüştür. Çevrim içi anket formları aracılığıyla elde edilen veriler SPSS 22 programı kullanılarak bilgisayar ortamına aktarılmış ve verilerin analizinde SmartPLS 4 programı kullanılmıştır. Verilerin analizinde yapısal eşitlik modeli kullanılmıştır. Araştırmanın sonuçlarına göre, çalışma yaşamında pazarlama ve satış faaliyetinde bulunan bireylerin liderleriyle olan etkileşimleri, çıkar bağlılığı ve örgüt yararına etik olmayan davranışlar arasındaki dolaylı ilişkiyi negatif olarak etkilemiş ve bu etkileşmiş aracı etkiye statü arzusunun aracılık ettiği ortaya koyulmuştur.Öğe New results on negative-indexed pell numbers via matrix methods(SİVAS CUMHURİYET ÜNİVERSİTESİ, 2025) Gökcan, İbrahim; Çağlayan, Ümmügülsüm; Değer, Ali HikmetIn this study, we investigate the Pell and Pell–Lucas numbers sequences and construct matrices whose elements are defined using negative indices of these sequences through Binet’s formula. Identities involving negative- indexed Pell and Pell–Lucas numbers are derived using the determinants and traces of these matrices. Furthermore, we examine various powers of the constructed matrices and discuss related elementary matrix operations.Öğe Novel azo-substituted metallophthalocyanines (M: Co, Ni, Cu, Zn) bearing hydroxy, carbonyl, and methoxy groups: Synthesis and evaluation as pre-catalysts for the transfer hydrogenation of aldehydes and ketones(ELSEVIER, 2025) Namlı, Mesut; Işık, Uğur; Kantar, Cihan; Şaşmaz, Selami; Aydemir, MuratIn this study, four novel metallophthalocyanine (MPc) compounds derived from phthalonitrile ligands incorporating o-vanillin were synthesized, characterized, and evaluated as pre-catalysts in the acetophenone and benzaldehyde transfer hydrogenation (TH) reactions. The molecular structures of the complexes were confirmed by FTIR and UV-Visible spectroscopy and elemental analysis. Among the complexes, copper phthalocyanine compound (5) exhibited the highest catalytic efficiency, promoting the acetophenone and benzaldehyde transfer hydrogenation reactions in propan-2-ol under inert conditions, and the corresponding alcohols have a 98 % conversion rate within 1 h (A1) and 99 % conversion within 6 h (K1). The results show that both the electronic effects of substituents on the phthalonitrile ligands and the central metal nature play key roles in determining the catalytic performance of the MPc complexes in TH reactions.Öğe Novel bridged binuclear ruthenium-aminophosphine complexes for the transfer hydrogenation of ketones using isopropanol: Synthesis, catalytic performance, and electrochemical behavior(ELSEVIER, 2025) Tanrıverdi Gergin, Zuhal; Toksoy, Mahmut Ozan; Işık, Uğur; Baysal, Akın; Güzel, Remziye; Aydemir, Murat; Durap, FeyyazThe starting material N,N '-bis(diphenylphosphino) ethane-1,2-diamine (1) was prepared for the first time in this study by a one-step reaction of 1,2-ethylenediamine with one equivalent of diphenylchlorophosphine. The reaction of 1 with either [Ru(p-cymene)(mu-Cl)Cl](2) or [Ru(benzene)(mu-Cl)Cl](2) afforded a series of novel bridged binuclear complexes of [C2H4-{NHPPh2-Ru(benzene)Cl-2}(2)], 1a and [C2H4-{NHPPh2-Ru(p-cymene)Cl-2}(2)], 1b, respectively. All newly synthesized complexes were comprehensively characterized using various analytical and spectroscopic techniques. H-1-, C-13-, P-31{H-1} NMR, (HH)-H-1-H-1 COSY or (HC)-H-1-C-13 HETCOR correlation experiments were employed to validate the spectral assignments. Both complexes are appropriate catalyst precursors for transfer hydrogenation of acetophenone derivatives. In particular, the complex [C2H4-{NHPPh2-Ru(benzene)Cl-2}(2)], referred to as 1a, demonstrates outstanding catalytic efficiency, by producing the relevant alcohols in 99 % conversion at 82 degrees C (TOF similar to 1200 h(-1)) in 5 min, outperforming analogous complexes in transfer hydrogenation reactions. Furthermore, the chemical characterizations, electronic transitions, and electrochemical properties of the Ru(II) complexes were systematically investigated by experimental methods.Öğe Synthesis and characterization of triazole-based schiff bases as novel highly efficient organocatalysts for rapid H2 generation via NaBH4 methanolysis(ELSEVIER SCI LTD, 2025) Işık, Uğur; Gültekin, Ergün; Elma Karakaş, Duygu; Kaya, MustafaThe triazole skeleton is a fundamental building block in heterocyclic chemistry and has been widely investigated for its applications in various fields such as materials science, medicinal chemistry and organic synthesis. Despite this broad utility, the use of this building group as an organocatalyst for hydrogen production is a largely neglected and under-researched topic in literature. While Schiff base-metal complexes (M = Cu, Zn, Ni, etc.) have previously been employed in sodium borohydride (NaBH4) hydrolysis reactions, it is particularly noteworthy that, for the first time, only triazole-based organocatalysts have been utilized as catalysts for hydrogen generation via the NaBH4 methanolysis. In this work, we synthesized, characterized, and optimized triazolebased organocatalysts (MF-MB-PF) and focused on as an efficient catalyst for hydrogen evolution via the alcoholysis of NaBH4. The hydrogen production performance of the MF catalyst was systematically evaluated on the basis of parameters such as catalyst type and amount used, NaBH4 concentration, different solvent systems, various methanol-water ratios, temperature conditions and catalyst reusability. The MF-catalyzed NaBH4 methanolysis reaction was completed in just 0.8 min. Moreover, the hydrogen generation rate (HGR) for the MFcatalyzed reaction was calculated to be 20,540 mL min-1gcat-1 at 30 degrees C, which is comparable to, or better than, that of most metal-free catalysts used for similar purposes. In addition, we determined the activation energy for the MF-catalyzed reaction to be 16.98 kJ/mol. The MF catalyst exhibited remarkable reusability with no significant loss in the first three cycles in the catalytic activity used for the five-cycle reaction. Additionally, the possible mechanism of the MF catalyst in the NaBH4 methanolysis reaction is discussed. Overall, this study introduces MF as a novel metal-free catalyst for hydrogen generation and highlights its potential as an efficient material.Öğe Evaluating barriers to implementation of open innovation in SMEs: A case study in Ordu province(Awrak Thakafieh, 2025) Aytekin, Ahmet; Korucuk, SelçukApproaches such as innovation, innovation management, open innovation, and utilization of technology have become critical for almost all businesses to stay ahead of the competition in today's globalized corporate environment. Non-enterprise innovation applications, often known as open innovation in enterprises, are integrated by embedding them into internal systems. The production of innovative ideas in collaboration with non-enterprise partners can be classified as open innovation practices within small and medium-sized businesses (SMEs). As a result, they are critical components in assisting organizations, such as offering a competitive advantage to SMEs, cost reduction, improving customer service quality, and responding to market needs on time. Yet, SMEs have a number of challenges when it comes to open innovation applications. The elimination of these barriers and problems will also increase the agility of SMEs. In this context, the barriers to open innovation implementation in SMEs were investigated, and the criteria that prevent open innovation were identified. The weight coefficients representing the importance levels of the criteria were calculated using the Interval Valued Intuitionistic Fuzzy Ranking Comparison (RANCOM) technique. According to the findings, the most critical barrier in the fulfilment of open innovation was " inadequacy or lack of management support.".Öğe Cultural adaptation and Turkish version of the Late-Life Function and Disability Instrument for individuals with gonarthrosis: A validity and reliability study(Taylor and Francis Ltd., 2025) Hazar, Yağmur; Atıcı, Emine; Çağlıyan Erdoğan, Hande; Kardesş KübraPurposes: This study aimed to culturally adapt and assess the psychometric properties of the Turkish version of the Late-Life Function and Disability Instrument (LLFDI) in elderly individuals with knee osteoarthritis (gonarthrosis). Methods: A total of 240 participants aged ≥65 were selected using simple random sampling. The adaptation process followed Beaton’s guidelines and included translation, back-translation, and pilot testing. Reliability was assessed using Cronbach’s alpha, test-retest, and intraclass correlation coefficients (ICC), while validity was evaluated via exploratory and confirmatory factor analyses and convergent validity with established scales. As part of convergent validity, the relationship of the LLFDI with Barthe Index (BI) and the Functional Independent Measurement (FIM), the Lequesne Index were used. The correlations between the LLFDI scores and these scales were analyzed to determine the level of convergent validity. Results: The LLFDI demonstrated high internal consistency (Cronbach’s α > 0.70) and test-retest reliability (ICC = 0.734–0.899). Construct validity was supported by Exploratory Factor Analysis (KMO = 0.838–0.952) and significant Bartlett’s Test (p < 0.001), revealing appropriate factor structures. Convergent validity was confirmed through significant correlations with the BI, FIM, and Lequesne Index. Conclusion: This study demonstrated that the Turkish version of the LLFDI is a valid and reliable assessment tool for individuals diagnosed with gonarthrosis. Clinical Trials: NCT06858085.Öğe Evaluation of antibacterial, antioxidant activities and secondary metabolites profile of orchids with different dried methods(Marmara University, 2025) Özkan, Ahmet İsmail; Canbolat Gültekin, Deniz; Soruklu, Sudenaz; Işık, Uğur; Akmeşe, OsmanThe Central Black Sea region is a very dense region in terms of orchid diversity. As a consequence of the floral studies, 32 species of salep orchids were identified in the Central Black Sea Region. The aim of this current study was to identify the secondary metabolite profiles of leaves and tubers of two orchid species (Anacamptis palustris and Ophrys apifera) with different drying methods by HPLC analysis and to determine their antibacterial and antioxidant activities. For this purpose, different drying methods were applied to the roots and leaves of these two species. The species were dried by 3 different techniques: shade, lyophilizer and oven. After the aqueous extracts were obtained, their antibacterial and antioxidant activities were tested and HPLC analysis was completed. The data obtained from aqueous extracts as a result of drying techniques were compared with the data obtained from fresh plant aqueous extracts. Antibacterial properties were tested against Staphylococcus aureus ATCC 25923, Escherichia coli ATCC 25922 and Pseudomonas aeruginosa ATCC 27853 bacteria. No antibacterial activity was found in the study. Antioxidant properties were tested via DPPH and FRAP assays. As a result of DPPH free radical scavenging assay, the highest antioxidant efficiency in A. palustris was observed in leaves dried in lyophilizer (76.53%), in the shade (62.13%) and in the oven (54.12%), respectively. Nine different phenolic compounds were found in aqueous extracts of these species. Epicatechin, Gallic Acid, Rutin, Syringic Acid phenolic compounds were observed the most in HPLC analysis. The results of current study suggest that these extracts have antioxidant and phenolic contents and should be investigated in more comprehensive studies.Öğe Transformation of content consumption in the context of digitalization: A comparative analysis on traditional television broadcasting and online platforms(IGI Global, 2025) Yurdigül, Aslı; Ayaz, YusufThis study examines the transformative effects of digitalization on content consumption through traditional television broadcasting and online video platforms. To this end, interviews were conducted with 22 participants with different sociodemographic characteristics to understand the changes in media usage practices. The research findings reveal that traditional television viewing is based on habits and socialization. In contrast, it is understood that the diversity of content, ease of access, time-space flexibility, and personalization of digital platforms form the basis of new viewing habits. In conclusion, although television and digital platforms reveal a hybrid media consumption that complements each other, it is understood that digitization is the cause of change in viewing habits. This study reveals that the transformation in media consumption is not only technological but also has cultural and social dimensions; it contributes to the development of user-oriented strategies in the digitization process of the broadcasting sector.Öğe Rapid hydrogen production by NaBH₄ solvolysis: Synergistic effect of the methanol–propylene glycol solvent system with a novel biomass-derived N,O-doped catalyst(Elsevier Ltd, 2025) Işık, UğurThis study concentrates on the characterization and optimization of a novel biowaste-derived catalyst, N,O-doped Cat₁₃₁-700, synthesized from Laurus nobilis leaves (LnL), for hydrogen production by the sodium borohydride solvolysis. Optimization experiments were conducted to identify the most suitable conditions, including the ratio of potassium carbonate (PCK) to ammonium oxalate monohydrate (AO), as well as the carbonization temperature and time. A variety of techniques were used to characterize the catalyst, including SEM, SEM-EDS, FTIR, XRD, BET and XPS. The specific surface area of the N,O-doped Cat₁₃₁-700 catalyst was measured as 697.66 m²/g, indicating a moderately developed porous structure. Performance activities showed the efficiency of the catalyst in hydrogen production, with essential factors such as the catalyst amount, the NaBH₄ quantity and the temperature affecting the reaction kinetics. Remarkably, the NaBH₄ methanolysis reaction catalyzed by N,O-doped Cat₁₃₁-700 was completed in approximately 4 min, whereas the same amount of hydrogen was generated within just 20 s in a methanol/propylene glycol (5:5) solvent system. The hydrogen production rate for the N,O-doped Cat₁₃₁-700 catalyzed reaction was calculated as 300,000 mLmin⁻¹gcat⁻¹ at 30 °C. Furthermore, the activation energy of the catalyzed reaction was calculated as 11.99 kJ/mol, which is notably low compared to many other catalysts reported for similar applications. Overall, this study introduces N,O-doped Cat₁₃₁-700 as a promising, efficient, and reusable catalyst for sustainable hydrogen generation, particularly under mild reaction conditions.Öğe Effects of black garlic addition and cooking duration on nitrosamine levels and quality attributes of sucuk(Multidisciplinary Digital Publishing Institute (MDPI), 2025) Kaya, Mükerrem; Karayiğit, Asena; Yılmaz Oral, Zeynep Feyza; Öztürk, Kübra; Fencioğlu Çakır, Halenur; Akyol, Yağmur; Ulutaş Altaylı, Bilge; Sallan, Selen; Kaban, GüzinSucuk, a type of dry fermented sausage, is generally consumed cooked, unlike many fermented sausage types. Therefore, alternative applications to prevent nitrosamine formation in fermented sausages such as sucuk are of great importance. This study aimed to determine the effects of black garlic (BG) and cooking time (0, 1, or 3 min at 180 °C) in sucuk. For this purpose, four different sucuk batters were prepared: FG1 (1% fresh garlic-control), BG1 (1% BG), BG2 (2% BG), and BG3 (3% BG). After ripening, the samples were cooked for different durations and subjected to nitrosamine analysis. Additionally, the study investigated the effect of BG on the qualitative properties of the ripened samples (uncooked). The results showed that the use of BG in sucuk led to a decline in lactic acid bacteria and Micrococcus/Staphylococcus counts (p < 0.05). The pH and residual nitrite levels in BG2 and BG3 were lower than those in FG1 and BG1 (p < 0.05). The TBARS value increased with increasing usage rate of BG (p < 0.05). BG2 and BG3 increased N-Nitrosodimethylamine (NDMA) compared to FG1 and BG1 (p < 0.05). Garlic treatment had no significant effect on the N-Nitrosodiethylamine (NDEA) (p > 0.05). As the cooking time increased, the NDMA and NDEA content increased (p < 0.05). The interaction between treatment and cooking time affected only N-Nitrosopiperidine (NPIP), and at the 3 min cooking time, BG3 exhibited a higher NPIP content than FG1, BG1, and BG2 (p < 0.05). As a result, BG2 and BG3 had a negative effect on some quality properties of sucuk, while FG1 and BG1 generally showed similar results. Additionally, BG2 and BG3 showed similar increases in NDMA content. Nitrosamine content increased with increasing cooking time, but BG3 was more effective in NPIP formation than BG2 after 3 min of cooking.Öğe Investigation of determinants of fibonacci-hessenberg-lorentz matrices and special number sequences(Association of Mathematicians (MATDER), 2025) Gökcan, İbrahim; Değer, Ali HikmetThe research aims to construct a new type of matrix called the Fibonacci-Hessenberg-Lorentz matrix by multiplying Fibonacci-Hessenberg matrices with Lorentz matrix multiplication. The study will start by examining the properties of Hessenberg and tridiagonal matrices and then focus on developing the Fibonacci-Hessenberg matrix using Fibonacci sequences. By multiplication it with a Lorentz matrix multiplication, the resulting matrix, the Fibonacci-Hessenberg-Lorentz matrix, will be analyzed to obtain special number sequences through its determinants for n ≥ 1. The primary objective is to explore whether the determinants of these matrices can generate new or known number sequences, where the elements are expressed as functions of the matrix parameters. Furthermore, the research will attempt to generalize these sequences of using Fibonacci numbers to establish a generalized formula for their terms. Ultimately, the goal is to derive a mathematical representation that connects the characteristics of the newly defined matrices to well-known special sequences in mathematics.Öğe Zinc phthalocyanine as a heterogeneous catalyst for efficient H₂ generation from NaBH₄ methanolysis(Elsevier Ltd, 2025) Işık, Uğur; Namlı, Mesut; Kantar, Cihan; Elma Karakaş, DuyguPhthalocyanines have been extensively studied for their role in photodynamic therapy, sensors, optoelectronic devices etc.; however, their use as catalysts for hydrogen generation (HG) has remained a relatively unexplored area in scientific literature. This study is the first investigation into the catalytic potential of zinc phthalocyanine (ZnPc) complex in hydrogen production via methanolysis reaction of sodium borohydride (NaBH₄). The kinetic performance of the ZnPc catalyst was evaluated based on catalyst amount, NaBH₄ concentration, temperature, and reusability. The ZnPc-catalyzed NaBH₄ methanolysis completed in 5.7 min, with a hydrogen generation rate of 8993 mLmin⁻¹gcat⁻¹—comparable to or better than many similar catalysts—and an activation energy of 28.47 kJ/mol. The catalyst exhibited remarkable reusability with no significant loss in catalytic activity when used for the three-cycle reaction. Additionally, the ZnPc-catalyzed NaBH₄ methanolysis mechanism was also examined, revealing that –OH, –O–, and –N=N– groups play key roles in its notable HG efficiency. Overall, this study presents ZnPc as a promising catalyst for HG and emphasizes its catalytic efficiency and application potential in sustainable energy technologies.Öğe Synthesis of Phthalocyanine Compounds Utilizing Thymol and Carvacrol Azo Dyes as Catalysts in Transfer Hydrogenation of Aromatic Aldehydes and Ketones With 2-Propanol(John Wiley and Sons Ltd, 2025) Namlı, Mesut; Işık, Uğur; Kantar, Cihan; Şaşmaz, Selami; Aydemir, MuratHydrogen transfer reduction systems are attracting increasing interest from synthetic chemists because of their simplicity in functioning. In this work, eight new metallophthalocyanine (MPc) compounds ligated on phthalonitrile ligands, including thymol or carvacrol, have been structurally elucidated and used as precatalysts in the transfer hydrogenation (TH) of acetophenone. FT-IR and UV–vis spectroscopies, elemental analyses, and LC-MS spectrometry were used to establish the molecular structures of the new phthalocyanine complexes. The nickel compounds (1b and 2b) act as efficient catalysts, which bring about catalytic TH reactions of a broad array of ketones in propan-2-ol and inert conditions (99% conversion in 3.5 h for 1b and 97% conversion in 4 h for 2b, respectively). The electronic properties arising from the position of the groups on the ligand and the nature of the metals appear to regulate the catalytic performances of the complexes in transfer hydrogenation. Furthermore, the modular construction of these catalysts and their flexibility toward transfer hydrogenation (TH) make these systems to pursueÖğe A novel brain tumor magnetic resonance imaging dataset (Gazi Brains 2020): Initial benchmark results and comprehensive analysis(PeerJ Inc., 2025) Sagiroğlu, Şeref; Terzi, Ramazan; Çeltikci, Emrah; Börcek, Alp Özgün; Atay, Yılmaz; Arslan, Bilgehan; Şahin, Mustafa Çağlar; Nernekli, Kerem; Demirezen, Umut; Özdemir, Okan Bilge; Özdem Karaca, Kevser; Azgınoğlu, NuhThis article presents a new benchmark MRI dataset called the Gazi Brains Dataset 2020, containing MRI images of 100 patients, and introduces initial experimental results performed on this dataset in comparison with available brain MRI datasets. Furthermore, the dataset is analyzed using eight different deep learning models for high-grade glioma tumor prediction, classification, and detection tasks. Additionally, this study demonstrates the results of an explainable Artificial Intelligence (XAI) approach applied to the trained models. To demonstrate the utility of the proposed dataset, different deep learning models were applied to the problem, and these models were tested on various data and models applied for various tasks such as region of interest extraction, whole tumor segmentation, prediction, detection, and classification with accuracy, precision, recall, and F1-score. The experimental results indicate that the dataset is highly effective for multiple purposes, and the models reached significant results with successful F1-scores ranging between 93.2% and 96.4%. ROI and whole tumor segmentations were successfully performed and compared with seven algorithms with accuracies of 87.61% and 97.18%. The Grad-CAM model also demonstrated satisfactory accuracy across the tests that were conducted. Moreover, this study explores the application of XAI to the trained models, providing interpretability and insights into the decision-making processes. The findings signify that this dataset holds significant potential for various future research directions, including age estimation, gender detection, causal inference with XAI, and disease-related survival analysis.Öğe The reflections of the struggles between Armenian congregations in Adana(Osman Kose, 2025) Turan, MahmutDuring the Tanzimat Period, there were changes in the legal status of Christians in the Ottoman society. The aim of this study is to examine the effects of the changes that occurred during the Tanzimat Period on Christian Armenians in Adana. While the Christian sects recognized by the Ottoman Empire until the Tanzimat period were Orthodoxy and Gregorianism, Catholicism and Protestantism were also recognized during this period and members of these sects were given the right to represent and govern themselves. The recognition of new sects by the state caused political, social and economic conflicts between Armenian communities belonging to different sects in Adana. Adana, as a city that deeply felt the effects of Ottoman modernization, was a city where these conflicts intensified. In the study, the reasons why Armenians changed their sect and what kind of struggles these changes caused among Armenian communities were examined. The importance of the study is that it deals with what happened among the Christian Armenian communities in Adana in order to understand the change in Ottoman society. Archival documents, and literature of the period are the sources of the study. As a result, it has been determined that sectarian changes caused serious political and social struggles among the Armenian communities in Adana.Öğe Other orientation değişkeninin örgütsel vatandaşlık davranışı üzerindeki etkisi ve bir ölçek geliştirme çalışması(2024) Öztürk, Tayfun; Özcan, KerimBu çalışma Örgütsel Vatandaşlık Davranışı (ÖVD) üzerinde Other Orientation (OO) tutumunun doğrudan etkisinin olup olmadığını incelemektedir. Genelde düzenleyici değişken olarak ele alınan OO’nun, bağımsız değişken olarak bir başka değişken üzerinde etken bir role sahip olup olmadığının yanıtlanması amaçlanmaktadır. Diğer taraftan OO’nun belirleyiciliğinin ölçülmesinin yanında Türkiye’de yapılan çalışmalarda çok fazla ele alınmamış olan kavrama ilişkin ölçeğin geçerlilik ve güvenilirliğinin test edilerek yazına sunulması da hedeflenmektedir. Çalışmada veriler anket yoluyla toplanmış ve istatistiksel yöntemlerle analiz edilmiştir. Bankacılık sektöründe yapılan araştırmada, 397 banka çalışanından elde edilen verilerin analizi sonucunda ÖVD üzerinde OO etkisinin istatistiksel olarak anlamlı ve pozitif yönde ancak orta düzeyde olduğu görülmüştür. OO ölçeğinin geçerliliği ve güvenilirliği kanıtlanmış olup alanda kullanılabilir bir ölçek olacağı düşünülmektedir.Öğe Changing gatekeepers in the new media age: An analysis of Internet newspapers and Twitter(Erciyes Üniversitesi, 2024) Ayaz Hasançebi, Elif; Yılmaz, AdemThe study aims to reveal the relationship between the user, who has the role of "secondary gatekeeper" with social media, and online newspapers. Thus, this study provides information about the secondary gatekeeping role by helping us understand the relationship between online newspapers, social media and secondary gatekeepers. Thus, this study helps us to understand the relationship between online newspapers, social media and secondary gatekeepers and provides information about the role of secondary gatekeeping. In the study, the news published by media organizations that carry out journalistic activities on Twitter, a social media platform, and the rate and nature of the interaction given to this news by users were examined using qualitative research methods. Therefore, it includes findings that will help to determine the popularity of the news published by online newspapers on Twitter, the topics to which they direct interest, and what kind of reactions are generated by the users. The sample of the study consists of the news published on Twitter between 5-9 December 2022 by internet newspapers such as Aykırı, Ensonhaber, GZT and Pusholder, which actively publish on Twitter in Turkey. Numerical values related to the research findings are presented in frequency and percentage tables and graphs. According to the research findings, it has been determined that Twitter users influence online newspapers in the news publishing process and thus assume a secondary threshold watchdog role.
