Yazar "Kepekçi, Haydar" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    INVESTIGATION OF RISK POTENTIALS IN OPERATING ROOMS FOR WORK SAFETY AND THE IMPACT OF LIGHTING CONDITIONS ON THE VISUAL ATTENTION OF THE EMPLOYEES
    (Rüştü UÇAN, 2020) Kepekçi, Ali Bestemi; Kepekçi, Haydar
    Aim: Occupational health, ensuring that employees are physically, socially and mentally healthy; making both working conditions and tools more suitable for human health; It covers all work done to protect employees from harmful effects from the workplace and to ensure harmonious work among employees. Protecting employees against potential risks in all workplaces is a basic approach. Operating rooms are also working areas where there are certain risks for employees. This risk is higher for anesthesiologists working in operating rooms for longer periods and shifts. In this study, it was aimed to determine the effect of lighting conditions in the operating room on the visual and sustainable attention level of the employees. Material and Method: Within the scope of the application, a working group consisting of 38 men and 27 women, who were between 20 and 47 years of age, who did not have any health problems in periodic health examinations, was formed. Each person in the study group was subjected to a 25-question visual attention test at 1000, 500, 250, 100 and 50 lux levels at different times, respectively, and the number of correct and incorrect answers given by each participant in each lighting condition was obtained. In addition, each person in the study group was exposed to 100 lux for an 8-hour period, and during this process, a visual attention test was performed at the end of the 1st, 2nd, 4th and 8th hours, and the results were recorded. The analyzes were carried out using the IBM SPSS Statistics 25.0 program. Results: While a significance was observed for the negative effect of age increase in relation to the level of illumination on visual attention, no significance was found for the gender factor. While the negative effect of illumination level on visual attention was significant at levels of 250 lux and below, it was not detected at 500 and 1000 lux levels. In each slice of exposure examined, a meaningfulness is observed in the name of its negative effect on visual attention. Conclusion: The level of visual attention has a direct relationship with the success of the work. The negative effect of illumination level on visual attention at 250 lux and below was found significant and this significance became more certain as the exposure time increased. The attention level of those who are in the operating room environment, especially the anesthesia team, may affect the work accidents and complications that may develop in the operating room.
  • Küçük Resim Yok
    Öğe
    Modeling Study and Performance Investigation of a Thermoelectric Refrigerator
    (2021) Kosa, Ergin; Kepekçi, Haydar; Ezgi, Cüneyt
    Thermoelectric refrigerators are widely used in electronics, medical, and food industry application areas. A refrigeration effect can also be achieved without using any moving parts by merely passing a small current through a closed circuit made up of two dissimilar materials. This effect is called the Peltier effect, and a refrigerator that works on this principle is called a thermoelectric refrigerator. They consist of several thermoelectric legs sandwiched between two thermally conductive plates, one cold and one hot. Thermoelectric refrigerators presently cannot compete with the vapor-compression refrigeration system because of their low- coefficient of performance (COP). However, some applications have been preferred because of their small size, simplicity, quietness, and reliability. In this study, a thermoelectric cooler having a maximum cooling power of 50 W, having a dimension of 40mmx40mmx3.6 mm, is modeled in multi-physics software. Also, the performance of a thermoelectric refrigerator is investigated. It is computed the temperature difference between ceramics plates versus electric current and COP for a temperature difference between ceramics plates. The simulation results are compared with experimental data. The data obtained from the analyses have been compared with the experimental results and found to agree with each other. For the surface temperatures of 25 oC and 50 oC, the maximum coefficients of performance have been computed to be 1.091 and 1.445, respectively. In general, as the temperature of hot surfaces has increased for the same temperature differences, the COP of the thermoelectric cooler has increased.