İstanbul Gelişim Üniversitesi Kurumsal Açık Erişim Arşivi
DSpace@Gelişim, İstanbul Gelişim 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
Brief skin cooling modulates the refexes generated by whole‑body vibration
(SPRINGER, ONE NEW YORK PLAZA, SUITE 4600 , NEW YORK, NY 10004, UNITED STATES, 2025) Kalaoğlu, Eser; Alayoğlu, Orhun; Sezikli, Selim; Atasoy, Mücahit; Türker, Kemal Sıtkı; Karacan, İlhan
Background Whole-body vibration (WBV) is a popular exercise method known for its neuromuscular benefts, though the underlying mechanisms remain unclear. WBV activates distinct refexes based on vibration amplitude and voluntary muscle activity: low-amplitude vibration or voluntary contraction typically triggers the tonic vibration refex (TVR), whereas highamplitude vibration or quiet standing activates the bone myoregulation refex (BMR). Muscle spindles, which are sensitive to sympathetic input, may exhibit increased responsiveness to vibration during brief skin cooling. Objectives This study investigated the refex mechanisms activated by WBV during quiet standing and their modulation by skin cooling. Methods Thirty healthy young adults participated. The latency of the soleus TVR, induced by Achilles tendon vibration, and the latency of the soleus BMR, induced by WBV, were measured. These assessments were repeated during the cold pressor test (CPT), involving left-hand immersion in cold water. Results The soleus TVR latency was 36.2 ±5.1 ms, while the soleus BMR latency was 40.4 ±5.0 ms. During CPT, Achilles tendon vibration latency remained unchanged (36.2 ±5.7 ms, p= 0.319). However, the WBV-induced refex latency with CPT (36.0 ±6.1 ms, p< 0.0001) was signifcantly shorter than the soleus BMR latency and aligned with the TVR latency (p= 0.711). Conclusion WBV activates BMR in a quiet standing position, but with skin cooling, the TVR predominates, likely due to heightened spindle sensitivity. These fndings ofer valuable insights into developing targeted WBV programs.
Evaluation of Simulation Results of HEC-RAS Coupled 1D/2D and 2D Modeling Approaches Through Scenario-Based Analysis
(MDPI, MDPI AG, Grosspeteranlage 5, CH-4052 BASEL, SWITZERLAND, 2025) Spor, Pınar; Paşa, Yasin; Doğan, Emrah
While 1D, 2D, and coupled 1D/2D models are widely used in flood extent mapping, a significant research gap remains in comparative analyses of 2D and coupled 1D/2D approaches. Study of the Dinsiz Stream Basin is of critical importance due to its proximity to industrial zones and residential areas, as well as its susceptibility to flood risk. Due to the lack and insufficiency of flow data in the basin, only long-term rainfall data were used in the analysis. Rainfall return periods of 50, 100, 200, and 500 years were estimated using statistical methods, and these values were utilized to generate flood hydrographs for this study. These values were then transferred to HEC-HMS, and the resulting hydrographs were input into HEC-RAS to establish coupled 1D/2D and 2D models for comparison. Flood mapping was performed for different return periods to evaluate the flood impact. This study revealed that maximum water levels in the 1D/2D models were higher than in the 2D models. The results showed that Dinsiz Stream could cause major losses for the second organized industrial zone located nearby when it overflows. The accuracy of the model was ensured with photographs of the flood event that occurred in 2021, ensuring the reliability of the findings.
Understanding the Association Between Bitcoin Mining and Environmental Sustainability in Light of the Sustainable Development Goals Through the DARDL and KRLS Methods
(WILEY, 111 RIVER ST, HOBOKEN 07030-5774, NJ, 2025) Çelik, Ali; Özırmak, Metehan
Assuring environmental sustainability is essential for the continuity of the ecosystem. Every sector of the economy has some degree of impact on environmental sustainability. The United Nations (UN)’ Sustainable Development Goals (SDGs) have placed these objectives within a broader global framework, offering a global plan aimed at ensuring environmental sustainability. This study assesses the role of cryptocurrency mining on environmental sustainability, incorporating monthly data for the period from 2015 to 2023. In this context, the impact of the electrical energy consumed in Bitcoin mining, which has the largest transaction volume among cryptocurrencies, and the climate policy uncertainty on Bitcoin greenhouse gas (GHG) emissions are examined by applying dynamic stimulated autoregressive distributed lag (DARDL) and kernel-based regularized least squares (KRLS) methods. The results of the empirical analysis indicate that the increase in Bitcoin electricity consumption and climate policy uncertainty have a significant negative impact on Bitcoin GHG emissions. Put another way, cryptocurrency mined using fossil fuels and climate policy uncertainty poses a considerable threat to environmental sustainability. These findings are crucial for policy makers and all stakeholders who want to achieve environmental sustainability goals to develop proactive proposals. It is also highlighted that Bitcoin mining should bring environmental regulations that can mitigate environmental degradation.
The mediatory role of challenge and threat in the relationship between positive thinking skills and perception of excellent performance: a study on football players
(FRONTIERS MEDIA SA, AVENUE DU TRIBUNAL FEDERAL 34, LAUSANNE CH-1015, SWITZERLAND, 2025) Pepe, Osman; Koç, Mustafa Can; Ayhan, Cihan; Talaghir, Laurentiu Gabriel; Bentea, Cristina Corina
Purpose: The present study aims to examine the mediating role of challenge and threat between positive thinking skills and perception of excellent performance in football players competing in the regional amateur league, which is referred to as a semi-professional league in Turkey. Methods: The study population consisted of football players competing in regional amateur leagues in the 2023–2024 season, and the sample consisted of 388 athletes selected using the simple random method. In addition to the demographic information form developed by the researcher, the Positive Thinking Skills Scale, the Challenge and Threat in Sport Scale and the Performance Perfectionism Scale for Sport were applied to the participants. The data were analyzed digitally through the SPSS 25 package program. The Pearson Correlation analysis was used to determine the correlations between the variables and a regression analysis of the indirect effect approach based on the Bootstrap method through PROCESS v4.2 macro was used to determine the mediating effect of challenge and threat in the relationship between positive thinking and perception of excellent performance. PROCESS Macro Model Option 4 developed by Hayes was used to examine the mediating effect. While conducting this analysis, the 5,000 resampling option was selected in the Bootstrap method. Results: The study found that positive thinking had a positive, moderate, and statistically significant effect on the perception of challenge (a = 0.439, p < 0.01) and excellent performance (c’ = 0.484, p < 0.001), with approximately 32% of the variance in challenge explained by positive thinking (R2 = 0.319, p < 0.01). Additionally, challenge played a mediating role. Positive thinking also had a negative, moderate effect on threat (a = −0.425, p < 0.01), explaining 7% of the variance in threat (R2 = 0.070, p < 0.01). However, the threat had a negative and low-level impact on the perception of excellent performance (b = −0.244, p < 0.001). Conclusion: In conclusion, it was found that the positive thinking skills of the football players positively affected their perceptions of excellent performance, and the feelings of challenge and threat they experienced on the field played a mediating role in the relationship between these positive thinking skills and perceptions of excellent performance.
Promoting sustainable health and safety in post-pandemic disaster risk management in Istanbul, Turkey
(FRONTIERS MEDIA SA, AVENUE DU TRIBUNAL FEDERAL 34, LAUSANNE CH-1015, SWITZERLAND, 2025) Agboola, Oluwagbemiga Paul
In line with Sustainable Cities and Communities (SDG 11), the COVID-19 pandemic has exposed the vulnerabilities of urban environments, emphasizing the critical need for robust strategic planning. Effective strategies are essential for mitigating the impacts of pandemics, enhancing the city’s resilience, and safeguarding the wellbeing of city inhabitants. Thus, more strategic measures are needed to ensure the health and safety of urban populations for future occurrences. This empirical study explores how environmental planning practices can mitigate health risks, especially in the post-COVID-19 pandemic era in Turkey. The study objectives include i) investigating factors influencing the built environment and the reduction of public health risks in the wake of the COVID-19 pandemic, and ii) exploring adaptable methods to improve the built environment in the wake of the COVID-19 pandemic. The results of the responses were assessed through Structural Equation Modeling (SEM) analysis of the SmartPLS four program. Results indicated positive path significant values of <0.005 to build community resilience after the post-COVID-19 pandemic. Other significant factors include sustainable built environment practices; Public Health risks, Sustainable City Planning; and Public Health improvement strategies. The positive relationships suggest that these factors are critical in promoting a
sustainable COVID-19 pandemic-free built environment in the future. Findings emphasize the importance of incorporating these significant variables into environmental planning and design as a strategy to achieve improved public health and an adaptable built environment.
