https://hdl.handle.net/20.500.12809/141 Sun, 05 Apr 2026 23:43:34 GMT 2026-04-05T23:43:34Z https://hdl.handle.net/20.500.12809/11022 Analysis of Burnout, Job Satisfaction, and Fatigue Among Yacht Crew: A Case Study of Turkish Yacht Crew Operating in the Southern Aegean Sea Şendilmen Danacı, Canan; Keçeci, Tuba An examination was conducted on the correlation between burnout, job satisfaction, fatigue levels, and the demographic characteristics of yacht crew. In March 2023, a survey was administered to 81 yacht crew of various ratings operating in the South Aegean. The Maslach Burnout Inventory, Minnesota Satisfaction Questionnaire, and Piper Fatigue Scale were used in the study, and the subdimensions of these scales analyzed in detail in relation to the yacht crew. Low burnout levels, moderate emotional exhaustion, low depersonalization and a lack of personal accomplishment was found among participants. Job satisfaction was moderate, primarily influenced by internal factors. Overall fatigue levels were moderate, with varying subscale levels. Deckhands had higher burnout and fatigue levels, whereas able seamen had the highest job satisfaction. Statistically significant relationships were found between participant age and years of service and burnout; between job satisfaction, competence, and years of service; and between fatigue and marital status. A statistically significant relationship was found between crew burnout and their levels of job satisfaction and fatigue. Another finding of the research was that males had higher job satisfaction than females, however, male crew members reported higher levels of burnout and fatigue. Furthermore, since there is dense yacht traffic in the Aegean Sea, the high levels of fatigue among yacht crew in the region could be affecting the safety of commercial vessel navigation. Excluding captains, this study is the first to research job satisfaction, burnout, and fatigue levels among yacht crew. Sun, 01 Jan 2023 00:00:00 GMT https://hdl.handle.net/20.500.12809/11022 2023-01-01T00:00:00Z https://hdl.handle.net/20.500.12809/10962 A Novel Membership Function Definition for Fuzzy Classification Uylaş Satı, Nur In this paper, a novel membership function is defined for fuzzy sets using a supervised learning approach. Firstly, the training dataset is separated using the previously defined polyhedral conic functions in a supervised learning approach. Then obtained polyhedral conic functions are used for defining a new membership function. After that, a new fuzzy classification algorithm is formed to classify fuzzy sets with a similar structure. The algorithm with all suggested methods is implemented on real-world datasets, and the performance values are compared with the state of art classification algorithms.; Bu çalışmada gözetimli öğrenme yaklaşımı kullanılarak bulanık kümeler için yeni bir üyelik fonksiyonu tanımlanmıştır. İlk olarak, gözetimli öğrenme yaklaşımında, eğitim veri kümesi, önceden tanımlanmış çokyüzlü konik fonksiyonlarla ayrılmış ve daha sonra elde edilen bu çokyüzlü konik fonksiyonlar yeni bir üyelik fonksiyonu tanımlamak için kullanılmıştır. Sonrasında ise bu fonksiyon kullanılarak benzer yapıda bulanık kümeleri sınıflandırmak için yeni bir bulanık sınıflandırma algoritması tanımlanmıştır. Önerilen tüm yöntemler bir algoritmada birleştirilerek, veri kümeleri üzerinde denenmiş ve performans değerleri, literatürde yer alan sınıflandırma algoritmalarıyla karşılaştırılmıştır. Sun, 01 Jan 2023 00:00:00 GMT https://hdl.handle.net/20.500.12809/10962 2023-01-01T00:00:00Z https://hdl.handle.net/20.500.12809/9691 Analytical and Numerical Analysis of the Strength Performance of a Novel Ship Construction Profile Taşdemir, Ahmet; Nohut, Serkan; Akman, Mehmet Construction profiles in different shapes such as bulb flats, tees, channels, and angles are widely used in the shipbuilding industry. During the ship construction process, these conventional profiles are joined to the plates as stiffeners and are dimensioned according to class rules. This article investigates the structural performance of a novel construction profile, the so-called TP profile, that can be used in the hull construction of ships and of which form is inspired by the human bone geometry. The cross-sectional area and the weight of the TP profile are designed to be equal to those of the conventional HP profile and commercial T profile. Strength performances of these profiles are compared via analytical and numerical analyses. The plate joint profiles are modeled under various loading and boundary conditions and the finite element method is used for the calculation of stress components and deflections. The TP profile has a high potential to be used in the shipbuilding industry. Fri, 01 Jan 2021 00:00:00 GMT https://hdl.handle.net/20.500.12809/9691 2021-01-01T00:00:00Z https://hdl.handle.net/20.500.12809/9472 Modeling and Comparison of Bodrum Gulets' Hull Forms with Round and Transom Sterns Turan, Bülent İbrahim; Akman, Mehmet Gulets built-in Bodrum region, known as Bodrum gulets, are special and unique yachts with a rich historical background and aesthetic designs. Besides aesthetics, the engineered design is important for such leisure crafts; thus, hull characteristics should be analyzed using a binary approach. In this paper, the hull form characteristics of Bodrum gulets with round and transom sterns are investigated, and parametric models based on geometrical dimensions are developed. In order to obtain reliable results, 20 round stern and 24 transom stern Bodrum gulets are used for the parametric evaluation. Hydrostatic parameters of these models are calculated, and general characteristics such as heaminess and fullness are obtained. Additionally, the Holtrop-Mennen method is also used to estimate the resistance performances of these displacement type hulls. The distinctive or similar characteristics of these types of yachts are presented and compared. Finally, a parametric framework is developed for use in the preliminary design stage of such yachts. Fri, 01 Jan 2021 00:00:00 GMT https://hdl.handle.net/20.500.12809/9472 2021-01-01T00:00:00Z