İstanbul Gedik Üniversitesi Kurumsal Akademik Arşivi
DSpace@Gedik, İstanbul Gedik 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
The acute effects of motor imagery combined with action observation breathing exercise on cardiorespiratory responses, brain activity, and cognition: a randomized, controlled trial
(Wiley-Hindawi, 2025) Atak, Ebrar; Ataç, Amine
Breath and brain activity have been integral to daily life since time immemorial. Cognition and cardiorespiratory responses are closely interlinked, necessitating further investigation into their dynamics. The potential benefits of combining motor imagery (MI) and action observation (AO) based breathing exercises in rehabilitation have not been fully explored. This study was aimed at assessing the acute effects of MI combined with AO on cognitive function and cardiorespiratory responses. Thirty-three healthy adults were randomized into MI combined with AO breathing (MI+AO), active respiratory exercise (ARE), and control groups, with equal distribution across groups. Electroencephalography (EEG) data were collected using a Muse EEG headband, and cognitive function was assessed using the Montreal Cognitive Assessment (MoCA) while imagining activities were measured via the Kinesthetic and Visual Imagery Questionnaire (KVIQ). Significant improvements in the Timed Up and Go (TUG) test and systolic blood pressure were observed in the ARE group (p < 0.05), alongside improvements in MoCA and KVIQ scores (p < 0.05). EEG data revealed significant decreases in delta and theta power at the temporoparietal (TP) location in the ARE group (p < 0.05). These findings suggest that MI and AO, when combined with respiratory exercises, may serve as effective passive strategies to support cognition and cardiorespiratory function, particularly in individuals who struggle to actively participate in pulmonary rehabilitation.
Lactate kinetics and fatigue dynamics in elite taekwondo athletes during a 30-second continuous jump protocol
(Projack, 2025) Kaya, Mehmet Zeki; Shahidi, Seyed Houtan
Background: This study examines lactate kinetics and performance declines during a 30- second BOSCO jump protocol in elite Taekwondo athletes, providing insights into anaerobic performance and recovery. Methods: Anthropometric data, including age, height, and weight, were collected, with averages of 21.2 years (+/- 2.0), 181.4 cm (+/- 4.8), and 70.6 kg (+/- 4.3). Fatigue-induced changes were assessed by measuring jump heights, contact times, and power outputs using the Witty Jump Mat (Italy) during the first and last 5 seconds of the protocol. Blood lactate concentrations were measured with the Lactate Scout 4 (Germany) at baseline, immediately postexercise, and at 3, 6, and 9 minutes post-exercise. Results: Significant declines were observed in jump height (mean decrease = 13%, p = 0.01) and power output (mean decrease = 15%, p = 0.02), alongside an increase in contact time (mean increase = 18%, p = 0.03), reflecting the impact of fatigue on explosive performance. Athlete B showed the greatest reduction in jump height (31.36%), revealing notable inter-individual variability in fatigue resilience. Blood lactate levels increased significantly from baseline (mean = 0.78 +/- 0.08 mmol/L) to peak post-exercise (mean = 3.16 +/- 1.19 mmol/L, p < 0.001) and subsequently declined. Lactate clearance rates were calculated as 40.5% at 3 minutes, 60.5% at 6 minutes, and 65.5% at 9 minutes post-exercise. Athlete D exhibited the fastest clearance rate (72%, p = 0.02), while Athlete C demonstrated delayed recovery. Conclusions: The findings underscore the need for tailored conditioning programs to optimize anaerobic performance and recovery in Taekwondo athletes. Future research should explore the effects of targeted training on anaerobic capacity and competition readiness in combat sports.
Orta güçte bir kalıcı mıknatıslı senkron motorun performans karakteristiklerinin deneysel olarak elde edilmesi
(Institute of Electrical and Electronics Engineers Inc., 2024) Demir, Onur; Kuyumcu, Feriha Erfan; Kep, Yusuf
Dünya çapında, kalıcı mıknatıslı senkron makinelere (KMSM) olan ilgi, uygulama alanlarının genişlemesiyle, bilhassa yenilenebilir enerji kullanımının artması ve ulaşımın elektrifikasyonu ile birlikte sürekli artmaktadır. KMSM'nun yüksek performans gerektiren robot uygulamalarında da giderek daha fazla kullanıldığını ve bu uygulamaların sadece doğruluk ve yüksek performans değil, aynı zamanda tasarım sürecinde ve uygulamada esneklik ve verimlilik sağlayan hız kontrolörleri gerektirdiğini göstermektedir. Son on yılda, hızla ilerleyen teknolojik çalışmalarla birlikte bahsedilen motor yapısına entegre edilen güç elektroniği kısmının gelişmesiyle modern teknolojide enerji verimliliği ve çevresel sürdürülebilirlik konuları da önemini korumaktadır. Orta güçte (110kW) bir Kalıcı Mıknatıslı Senkron Motorun performans değerlerini incelemek üzere, FOC (Alan Yönlendirmeli Kontrol) yöntemi ile laboratuvar ortamında yapılan dinamik testlere ilişkin sonuçlar bu çalışmada sunulmaktadır.
Sustainability in international trade: the importance of political risk analysis
(Springer Nature, 2024) Köseoğlu, Ahmet Murat
SustainabilitySustainability in international tradeInternational trade is increasingly an important factor for companies. Political risk analysisPolitical risk analysis has great importance in this context. Political risk analysisPolitical risk analysis supports companies’ decision-making processes in international tradeInternational trade. This analysis helps them to determine the countries that are riskier to do business in and contributes to making strategic decisions to increase sustainabilitySustainability. Political risk analysisPolitical risk analysis also guides companies in identifying markets that align with their sustainabilitySustainability goals. Companies need to make decisions based on political risk analysisPolitical risk analysis results to minimize risks and carry out their business projects sustainably. Managing political risks positively affects the financial performance of companies. Minimizing risks increases confidence in long-term decision-making processes and makes businesses more attractive to investors. Companies can use political risk analysisPolitical risk analysis to protect their supply chains against political risks that could threaten sustainabilitySustainability. Political risk analysisPolitical risk analysis affects not only financial sustainabilitySustainability but also social and environmental sustainabilitySustainability. Within this scope the aim of this study is to examine the role and importance of political risk analysisPolitical risk analysis for the sustainabilitySustainability of international tradeInternational trade. Political risk, political risk factors, the dimensions of political risk factors, and the relationship between political risk and sustainabilitySustainability in international tradeInternational trade have been examined in detail in this context. This relationship has been handled globally depending on the political risk comparison of countries. The study found that the most significant political risks are political instability, changing political regulations, and customs and trade restrictions. In addition, it has been observed that some countries have better policies and regulations on environmental and social sustainabilitySustainability issues. As a result, political risk analysisPolitical risk analysis is a critical tool to help companies achieve sustainabilitySustainability goals in international business. It has also been considered that political risk analysisPolitical risk analysis is very important in identifying potential risks, guiding decision-making processes, and increasing sustainabilitySustainability.
Effects of lower extremity isoinertial strength training on shooting speed, dynamic balance, and dribbling skills in adolescent football players
(Editura Universitatii din Pitesti, 2025) Kaya, O.; Tutar, Murat; Çağlayan, Atakan; Korkmaz, Halil
Purpose. Research indicates that the quadriceps muscle group significantly influences jumping, balance, and ball-striking speed, while the hamstrings play a crucial role in maintaining knee stability during running and twisting movements. This study aims to evaluate the impact of isoinertial strength training, which is believed to enhance hamstring strength in young football players, on dynamic balance, dribbling skills, and shooting speed. Materials and Methods. Forty-two U-16 football players from amateur team academies participated in the study and were divided into an experimental group (EG, n = 21) and a control group (CG, n = 21). In this study, young football players in the EG engaged in a 15-min isoinertial strength training program, incorporated into their warm-up routine twice a week for 8 weeks, before standard football training sessions. In contrast, the CG adhered to their usual warm-up and football training practices during the study period. The research design involved pre-test assessments, a 6-week isoinertial training intervention, and post-test evaluations. Pre-test data were collected from all participants before the training period, and post-test data were collected upon completion of the program. Various performance measures were evaluated, including height, body weight, body mass index (BMI), the Y-balance test for dynamic balance, dribbling skills, and shooting speed. These assessments provided a thorough analysis of both physical and skill-related factors pertinent to football performance. The CG maintained their standard training regimen without the addition of isoinertial strength exercises, facilitating a comparison of the effects of the isoinertial training intervention on the selected outcomes. Results. The data presented in this study indicate the potential of eccentric training to significantly enhance shooting speed (p < 0.001), balance (p < 0.001), and skill performance (p < 0.004) in adolescent athletes (p < 0.001). Conclusions. Improving skill-related performance during adolescence is crucial for creating effective movement patterns early in athletic development, thereby preparing athletes for more complex movements in the future.
