İstanbul Sağlık ve Teknoloji Üniversitesi Kurumsal Akademik Arşivi
DSpace@İSTÜN, Üniversite mensupları 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
Impact of structural and CFD analysis on the cost of biogas-fueled gas engine exhaust pipes
(Ahmet ÇALIK, 2025) Kaymaz, Rabia; Ak, Mine; Tanrıver, Kürşat
In this study, the effects of exhaust pipe design used in biogas-fueled cogeneration systems on engineering performance and cost were investigated. First, the existing system was analyzed by field work, and then structural analysis was applied with CFD (Computational Fluid Dynamics). The exhaust pipe route, pipe diameter, and material thickness of the existing system were evaluated, and design improvements were suggested. It was determined that the shorter pipeline application with the changes made in the pipe route and layout reduced pressure losses. Despite the use of an exhaust pipe with a smaller diameter and made of thinner material in the proposed new design, compliance with the standards was ensured, and it was shown to be safe against wind loads with finite element analysis. Considering the calculated maximum wind load of 5.52 kN and the weight of the system, the maximum stress value was calculated as 108.691 MPa as a result of the Von Mises stress analysis applied to the exhaust pipe system in the finite element analysis. This value showed that the system was 1.56 times safer. In the deformation analysis, the maximum displacement value was measured as 0.13 mm, and this value is ideal. In the cost analysis, it was determined that the proposed new system provides a cost reduction of approximately 53% compared to the existing system. The results obtained emphasize the importance of engineering analysis in exhaust pipe design, and show the applicability of the approach to increase economic and environmental sustainability in industrial facilities.
Suicide risk in psychiatric patients: An analysis of demographic and psychosocial factors
(SOCIAL SCIENCES STUDIES JOURNAL, 2025) Er, Filiz; Duyan, Veli; Özkan, Cengiz; Taymur, İbrahim
The aim of this study is to assess the likelihood of suicide in patients diagnosed with psychiatric disorders and currently receiving treatment, and to examine the relationship between this likelihood and demographic data, as well as psychosocial factors. Using a descriptive and cross sectional model, the data from 165 participants were collected and evaluated through a personal information form and the Suicide Probability Scale (SPS). The study revealed significant relationships between suicide risk and variables such as age, education level, marital status, place of residence, and types of social support. It was also highlighted that the participants generally had a negative perception of their psychological health, and individuals lacking emotional social support showed higher levels of hopelessness and negative self-concept. Furthermore, individuals receiving low social support were found to have a higher suicide risk. The findings indicate that social work professionals can play a significant role in identifying individuals at risk for suicide and developing preventive measures. These results point to the necessity of strengthening social support systems and improving psychological health services.
Anatomy based computer assisted evaluation for aesthetic new navel formation
(Springer Nature Link, 2025) Gövsa, Figen; Nteli Chatzioglou, Gkionoul; Biçer, Ahmet; Gökmen, Gökhan
Background This study aimed to determine the typical position and shape of the umbilicus among young individuals to guide the repositioning of the new umbilicus during abdominoplasty. Methods Standardized photographs of 63 young volunteers were analyzed to evaluate parameters such as the vertical and horizontal positions, length, ratio, and shape of the umbilicus. The study also established the mathematical relationships between the umbilicus and nearby anatomical structures like the xiphoid process, pubic symphysis, anterior superior iliac spine, iliac crests, and body mass index (BMI) to identify the ideal geometric shapes and positions. In two patients with abdominal skin sagging, abdominoplasty was performed with a new umbilicus designed according to these anatomical measurements. Results The umbilici were categorized by shape: vertical oval with superior hooding (29%), round (27%), vertical lozenge (21%), and protruded (11%). Ratios between anatomical points were measured, such as the ratio of the distance between the xiphoid process and the upper edge of the umbilicus to the distance between the lower edge of the umbilicus and the sym physis pubis, which was 1.64±0.40. Post-operative evaluation emphasized achieving a xiphoid-umbilicus/pubic symphysis ratio of 1.6:1 for the new umbilicus, with an aesthetically ideal ratio considered to be 1:1. A strong correlation was found between BMI and all umbilical ratios. Conclusions The most aesthetically pleasing navel position aligns with the golden ratio between xiphoid and umbilicus compared to the umbilicus and abdominal crease. Weight control is also crucial in achieving optimal belly aesthetics.
The association of exhaled nitric oxide level with respiratory muscle strength, pulmonary function, exercise capacity, sleep quality, functional status, and health-related quality of life in patients with pulmonary arterial hypertension
(Amer Thoracic So, 2025) Naci, Baha; Demir, Rengin; Önder, Ömer Önder; Sinan, Ümit Yaşar; Küçükoğlu, Mehmet Serdar
The Association of Exhaled Nitric Oxide Level With Respiratory Muscle Strength, Pulmonary Function, Exercise Capacity, Sleep Quality, Functional Status, and Health-Related Quality of Life in Patients With Pulmonary Arterial Hypertension
