İstanbul Galata Üniversitesi Kurumsal Akademik Arşivi
DSpace@Galata, İstanbul Galata Üniversitesi tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor, araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, Üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Kings of the milky way: a homogeneous Gaia DR3 analysis of king open clusters and the galactic disc metallicity gradient
(2026) Yontan, Talar; Bilir, Selçuk; Çakmak, Hikmet; Plevne, Olcay; Soyduğan, Esin; Taşdemir, Seval; Canbay, Remziye; Çınar, Deniz Cennet; Koç, Seliz; Karagöz, Hülya; Öztürk, Burçin Tanık; Akbaba, Furkan; Çalışkan, Özcan; Banks, Timothy
This study aims to establish an internally homogeneous set of structural, astrophysical, and kinematical parameters for King open clusters and to assess their role as tracers of the Galactic thin disc. We present a homogeneous structural, astrophysical, and kinematical analysis of 27 King open clusters using high-precision Gaia DR3 astrometry, photometry, and spectroscopy. Probable members are selected through astrometric criteria, from which mean trigonometric parallaxes and proper motions are derived, while structural parameters are obtained by fitting King surface-density profiles. Cluster reddenings, distances, metallicities, and ages are determined via a homogeneous Markov Chain Monte Carlo isochrone-fitting approach applied to Gaia colour-magnitude diagrams. The derived parameters span (Formula presented) -(Formula presented) mag, metallicities of (Formula presented) to (Formula presented) dex, ages from 17 to 6166 Myr, and heliocentric distances between 739 and 6272 pc. A comparison between astrometric and isochrone-based distances yields a median parallax difference of (Formula presented) as, indicating a good level of internal consistency between the photometric and astrometric distance scales within the adopted homogeneous framework. Using the resulting homogeneous parameter set, we then investigate the spatial distribution and orbital properties of the King clusters within the Galactic disc.The radial metallicity behaviour of the King clusters is also examined using three complementary Galactic distance definitions and compared with the metallicity-radius relations obtained independently from 164 spectroscopically analysed open clusters from the literature. The King-cluster gradients are close to (Formula presented) dex kpc−1 and are broadly consistent with those of the external reference sample, indicating that the homogeneously analysed King clusters follow the negative metallicity-radius trend traced by the broader thin-disc open-cluster population. Flatter gradients are found for young clusters, suggesting more homogeneous chemical enrichment at recent epochs. When dynamical constraints are applied to reduce the effects of radial migration and orbital blurring, the inferred gradient remains close to (Formula presented) dex kpc−1. The use of a strictly homogeneous analysis framework reduces inter-study systematics and provides a consistent astrophysical, chemical, kinematical, and orbital reference dataset for the King open-cluster sample. © 2026 COSPAR. Published by Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
Stress distribution in titanium and zirconia implants with full-arch prostheses: a finite element analysis
(BMC, 2026) Saz, Bahattin; Özyılmaz, Özgün Yusuf; Özyılmaz, Özge Doğanay
Objective The stress distribution and mechanical properties of materials used in dental implants are critically important for implant success and long-term stability. The aim of this study was to evaluate the stress distribution on implant, prosthetic system, and peri-implant tissues when titanium and zirconia implants are used with different framework materials using three-dimensional finite element analysis (FEA). Methods A three-dimensional edentulous maxilla model was reconstructed from computed tomography data, and twelve finite element models were subsequently developed based on this anatomy to represent different implant and framework configurations. Within the scope of the study, titanium and zirconia implants were modeled in combination with cantilevered and noncantilevered prosthesis types and Co-Cr, PEKK, and zirconium framework materials. An oblique static load of 200 N was applied at a 45° angle in the palato-buccal direction to the central fossa of the first molar on the models. The Von Mises and principal stress distributions in the implant, abutment, screw, framework, and peri-implant bone were examined. Results The highest Von Mises value was recorded in the cantilevered PEKK framework zirconia implant model (378.388 MPa). Compared with the Co-Cr and zirconium framework, the PEKK framework resulted in higher Von Mises stresses and greater prosthesis displacement. The presence of a cantilever increased stress levels in all framework materials, and stress concentrations were observed particularly in posterior abutments and peri-implant bone. Furthermore, stress values in trabecular bone were recorded above the physiological threshold level in the cantilevered PEKK framework models. Conclusions Although zirconia implants exhibited greater stress than titanium implants, they remained within safe limits. Rigid framework materials and cantilever-free designs provide more balanced biomechanical results.
SOSYAL MÜŞTERİ İLİŞKİLERİ YÖNETİMİNİN BİBLİYOMETRİK ANALİZ YÖNTEMİ İLE İNCELENMESİ
(2025) Altaylı, Meriç; Sarıkaya, Fatma Nur
Dijitalleşmeyle birlikte müşteri ilişkileri yönetiminin dijital ortama taşınması önem kazanmıştır. Elektronik müşteri ilişkileri yönetimi (E-CRM )kavramı ilk olarak 1990’lı yılların sonunda ortaya çıkmıştır. Web 2 teknolojileri ve sosyal medyanın gelişmesiyle beraber sosyal müşteri ilişkileri yönetimi (sosyal CRM ) kavramı 2000’li yılların başında literatüre girmiştir. Bu kavram ile sosyal medya araçları, müşteri ilişkileri yönetimine entegre edilmiştir. Sosyal müşteri ilişkileri yönetimi ile elektronik ortamda gerçekleşen müşteri ilişkileri yönetimin etkileşimin yüksek, çift yönlü ve topluluk odaklı olması sağlanmıştır. Sosyal CRM, müşteriyi sadece veri tabanına kayıtlı biri olarak değil sosyal medyayla etkileşime giren, topluluklara katılan aktif bir birey olarak görmektedir. Müşteri ilişkileri yönetiminde sosyal medya etkileşimleri, yorumlar ve paylaşımlar önemli bir noktada yer almaktadır. Son yıllarda sosyal CRM’nin artan önemiyle birlikte bu alanda yapılan çalışmalar da artış göstermiştir. Bu bağlamda bu çalışma ile sosyal CRM konusuyla ilgili 2010-2025 yılları arasında yayınlanan makaleler “sosyal CRM” , “sosyal müşteri ilişkileri yönetimi” veya “CRM 2.0” anahtar kelimeleriyle, Scopus veri tabanından elde edilerek R programı ile incelenmiş ve analiz edilmiştir. Elde edilen verilerile yayın sayıları, en çok yayın yapan yazarlar, ülkeler arası karşılaştırmalar, anahtar kelime analizleri, yazarların işbirliği analizleri, kelime birlikteliği analizi gerçekleştirilmiştir. Sosyal müşteri ilişkileri yönetimi alanındaki çalışmaların 2021 yılında en yüksek sayıya çıktığı belirtilebilir. En fazla katkı sağlayan ülkenin ABD’de olduğu, ABD’yi Çin, Hindistan, Avustralya takip etmektedir. Ayrıca, çalışmaların büyük ölçüde “müşteri memnuniyeti”, “e-ticaret” , sosyal medya”, “sosyal ağlar”, temaları etrafında yoğunlaştığı belirtilebilir.
Anthropomorphism in Marketing
(2026) Sarıkaya, Fatma Nur
This study examines the concept of anthropomorphism from a bibliometric perspective, as it has become increasingly important in the field of marketing alongside advances in digital technologies. Virtual influencers, robots, mascots, and chatbots have started to display more human-like characteristics, leading to important changes in consumer-brand relationships. Anthropomorphism stands out as an important factor that shapes and transforms consumer responses through the attribution of human-like emotions and characteristics to non-human entities. The study presents the current state of academic research on anthropomorphism within the marketing literature. In this context, publications indexed in the Scopus database were analyzed through bibliometric analysis to identify publication trends, citation structures, country distributions, and thematic clusters within the field. The findings show that studies focusing on anthropomorphism have increased rapidly, particularly after 2019, together with the growing role of artificial intelligence in marketing. The results also indicate that anthropomorphism has become a multidimensional area of research within the marketing discipline. Chatbot interactions, brand personality, virtual influencers, and service robots are among the most prominent themes in the literature, while strong relationships are also observed with variables such as social presence, consumer engagement, and parasocial interaction. At the same time, issues such as perceptions and biases toward artificial intelligence, consumer vulnerability, ethical risks, and cross-cultural differences appear to receive relatively limited attention in the literature. This study aims to systematically map research on anthropomorphism within the marketing discipline, identify current research gaps, and provide guidance for future studies. In today’s rapidly evolving digital environment, understanding the effects of humanlike entities on individuals is important from both academic and managerial perspectives.
Correction: Dimensional and cross-sectional compatibility of contemporary nickel-titanium files and their corresponding gutta-percha cones: A micro-computed tomography study
(2026) Şarkan, Cem; Haznedaroğlu, Faruk; Keleş, Ali
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