Browsing by Author "Demirel O."

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    The Role of Scientific and Technological Performance on Economic Growth: A Panel Data Analysis for OECD Countries; [Bilimsel ve Teknolojik Performansın Ekonomik Büyümeye Etkisi: OECD Ülkeleri Üzerine Bir Panel Veri Analizi]
    (Sosyoekonomi Society, 2022) Tekin A.; Demirel O.
    Non-physical factors such as education, knowledge, information, innovation, and research and development (R&D) are new sources for economic growth. The study analyses the effect of scientific and technological performance on GDP. Pedroni Cointegration Test, Vector Error Correction Model, and Granger Causality Analysis are applied to 21 OECD member countries for the 2003-2016 period. As the result of the analysis, it is determined that there is a long-term relationship between R&D expenditures used in the concretization of scientific and technological performance, the number of patents applied for innovation, and GDP. Further, the relationships’ directions are determined from patent applications to GDP and GDP to R&D expenditures. © 2022, Sosyoekonomi Society. All rights reserved.
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    The Effect of Centrifuge Duration on Fat Graft Survival
    (Georg Thieme Verlag, 2023) Demirel O.; Karakol P.; Bozkurt M.; Tuglu M.I.
    Background Although fat grafts are widely used for reconstruction and aesthetic purposes, their survival rates differ significantly. Centrifugation is one of the methods used to increase the survival of fat grafts. However, experimental studies examining the long-term outcomes of centrifugation duration are currently limited. Thus, in the present study, the effects of centrifugation duration on the survival of fat grafts were assessed using an animal model. Methods Thirty Sprague Dawley rats were included in the study and fat grafts were obtained from each specimen by excision from inguinal fat pads. Preparation protocols were administered as an en-bloc fat graft in Group 1, minced fat graft in Group 2, and fat graft centrifuged at 1,054 ×g for 2 minutes, 3 minutes, and 4 minutes in Group 3, 4, and 5, respectively. After 12 weeks of follow-up, grafts were harvested and were subjected to histopathological evaluation based on an established scoring system. Results En-block fat grafts were associated with necrosis, fibrosis, inflammation, vacuole formation, and alterations in adipocyte morphology. Among the three centrifugation groups, Group 3 demonstrated the best adipocyte viability and vascularity. However, graft weights decreased in all experimental groups. Conclusion The centrifugation process may have positive effects on adipocyte survival by means of purifying the fat graft and increasing adipocyte concentration. When the centrifugal durations were compared, 3-minute centrifuge yielded the most favorable results. © 2022. Association of Plastic Surgeons of India. All rights reserved.
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    The Rising Artificial Intelligence Revolution, Its Impact on Employment and Productivity; [Yükselen Yapay Zekâ Devrimi: İstihdam ve Verimlilik Üzerine Etkisi]
    (Sosyoekonomi Society, 2025) Tekin-Balci A.; Demirel O.
    Traditional sectors are being replaced by digitalisation in most areas of economic life. Artificial intelligence (AI) technologies are expected to leave their mark on the future. In the study, the effect of AI on employment and productivity is carried out using panel data for the 2002-2021 period for the ten countries that use the relevant technologies the most, and the Vector Error Correction Model, cointegration, Granger and Toda-Yamamoto causality tests. As a result of the analysis, a long-term positive relationship is determined between patent applications, R&D expenditures, high-tech product exports, and employment and productivity representing AI technologies, and according to the Toda-Yamamoto causality test results, there is a relationship between proxy variables representing artificial intelligence technologies and employment and productivity. It is concluded that there is” a multi-directional causality relationship. © 2025, Sosyoekonomi Society. All rights reserved.