Browsing by Author "Ahram, T."
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Item Blast performance of demining footwear: Numerical and experimental trials on frangible leg model and injury modeling(Springer, 2018) Ahram, T.; Karahan, Mehmet; Karahan, Nevin; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu.; AAK-4298-2021; 8649952500; 22034801200This study reveals the protective efficacy of a personal protective boot against mine blasts both experimentally and numerically. By employing analyses conducted with the use of different amounts of explosives, the protective efficacy of the developed boot is compared to a typical military boot as reference. Both for analysis and verification tests, a ballistic gelatin covered frangible leg model was used. Strain energy that is exerted on the leg was determined with numerical analyses and verified with data obtained from strain gauges that were placed on the leg model. By employing the dynamic finite elements method, the physical injury that occurred to the leg model was examined and compared with the results of the blast test. The type-2 boot decreased the strain energy by approximately 80% compared with the type-1 boot. This observation was also verified with measurements obtained from strain gauge sensors placed along the tibia bone. It was observed that the damage occurring on the tibia bone was limited to local injuries and concentrated at a single spot without causing any fractures with the type-2 boot. As a result of axial load, the leg with the type-1 boot demonstrated fractures at several points rather than a fracture at a single point based on deflection. Hence, the latter case yields irremediable injuries.Publication The sources of stress, the symptoms of stress and anger styles as a psychosocial risk at occupational health and safety: A case study on Turkish police officers(Elsevier Science, 2015-01-01) Aytaç, Serpil; Ahram, T.; Karwowski, W.; Schmorrow, D.; AYTAÇ, SEVİNÇ SERPİL; Uludağ Üniversitesi/İktisadi ve İdari Bilimler Fakültesi.; Ahram, T.; Karwowski, W.; Schmorrow, D.; I-7814-2019The present study aims at measuring the sources of stress, the symptoms of stress and anger styles of police officers as psychosocial risk factors. A survey was carried out on 5725 randomly selected police officers in a big city in Turkey. The questionnaire included some personal information. When collecting data, Mayerson's Stress Factor Scale was used to measure the sources of stress. The Psychological Symptom Checklist-SCL-90-R was used to measure the participants' psychological symptoms and the State Trait Anger Scale (STAS) is used to measure anger styles of police officers. When analyzing data, correlations and stepwise multiple regression analysis are used to examine the relationship.The findings of the present study have shown that there are meaningful relationships among the symptoms of stress, the sources of stress and anger. According to this pointing system, it has been found that the police officers got higher stress points from the Mayerson Stress Sources Scale when physical environment, job, social stress and self-expression are considered, and they were tended to have increased problems. Psychological symptoms are highly prevalent among Turkish Police officers. In the end, several suggestions have been made to the police departments to help the officers who are affected adversely by job stress. According to these findings, we suggest a more specific research to be performed in order to determine and prevent these stress factors among Turkish Police officers.