https://hdl.handle.net/20.500.12809/45 Sat, 20 Jun 2026 13:02:37 GMT 2026-06-20T13:02:37Z https://hdl.handle.net/20.500.12809/11205 Beyond Efficiency: Testing DEA -Selected Portfolios with Behavioral Utility and the Sharpe Ratio in BIST 100 Cenger, Hatice The study aims to empirically test the superiority of portfolios composed of stocks located on the DEA efficient frontier and introduces a multidimensional evaluation framework that integrates technical efficiency analysis with investor behavior. The risk-return space, based on Markowitz’s mean-variance model, is non-parametrically restructured using Data Envelopment Analysis (DEA). Portfolios constructed based on DEA super-efficiency scores are evaluated using a utility function representing investor preferences modeled within a behavioral finance framework (A = 1 and A = 5); performance is also compared via the Sharpe ratio. The analysis, conducted using BIST 100 data for the period 2016-2019, shows that the highest utility and Sharpe ratios are concentrated in portfolios identified by DEA as efficient. These findings suggest that technical efficiency and behavioral investment decisions can align, providing investors with a holistic framework for both rational and behaviorally consistent portfolio selection. Thu, 01 Jan 2026 00:00:00 GMT https://hdl.handle.net/20.500.12809/11205 2026-01-01T00:00:00Z https://hdl.handle.net/20.500.12809/11013 Organizational justice in the maritime industry Akgöl, Yasemin; Taşkın Eskici, Cemre Organizational justice is what the individuals who make up an organization expect to receive from the organization in return for the effort they put forth in order to reach the goals of the organization. Knowing the perceptions of employees about organizational justice in terms of job satisfaction and organizational commitment is important for organizational structures. Employees always compare themselves with others in the organizations they belong to. They expect the rules to be applied equally for each person in the organization, the wages to be paid equally for the same job descriptions, to have equal rights in leaves, and to benefit from social opportunities like everybody else. However, the basis of organizational justice perception is not only outputs and comparisons to these outputs, but also the interaction between the rules of the organization and the way these rules are applied and the people in the organization. The rules of the organization and the attitude in the implementation of these rules are important. One of the reasons for the angry behavior in the organization stems from the employees' perception of justice regarding the organization they are affiliated with. If employees realize that they are not treated fairly, they may display some negative and offensive behaviors in order to ensure justice. Such behaviors not only affect the workflow in the organizational structure, but also damage the relations between employees. Considering the labor-intensive structure of the maritime industry, the long working hours of the employees, the tiring and challenging conditions of working at sea, the fact that seafarers are often away from their families and cultures for a long time, and the emotional fatigue caused by all these conditions, it is very important to ensure organizational justice in maritime. Having a substantive organizational justice in the maritime sector is necessary to increase and maintain the qualifications and motivation of maritime workers. In this part of the book, firstly, the concepts of justice and organizational justice will be defined, the principles of organizational justice, its types and the details of the basic theories of organizational justice will be explained, the results of organizational justice will be specified and then the administration of organizational justice in maritime industry will be discussed. Sun, 01 Jan 2023 00:00:00 GMT https://hdl.handle.net/20.500.12809/11013 2023-01-01T00:00:00Z https://hdl.handle.net/20.500.12809/11012 Burnout in the maritime industry Koyuncu, Kaan Today's intense business relationships put a great deal of stress on employees both physically and mentally. Various occupational groups and organizational structures are faced with important levels of stress due to the difficulties created by working conditions. Because of the physical and environmental working conditions, the maritime industry is regarded as one of the most difficult in the world. In addition to being able to cope with these difficulties, seafarers are expected to be physically and mentally healthy, constantly ready, and able to adapt to the work environment. Consequently, employees suffer from a condition known as "burnout." Some of the causes of burnout are being away from home and loved ones, fatigue, long working hours, limited space, insufficient sleep, and international factors. Therefore, eliminating or minimizing the stress factors that may affect seafarers carries vital importance in terms of ensuring motivation in the organizational work environment. Stress includes the physiological and psychological responses of the individual to excessive and often undesirable stimuli and threatening incidents. Stress manifests itself with a burnout at the organizational level as well as at the individual level. In the maritime sector, it is essential that all maritime enterprises in the world, the education sector, the administrations, and shareholders think about burnout, develop, and implement applications to make the profession sustainable. In this part of the book, the definition and dimensions of burnout will be explained. After defining the concept of burnout, the details of burnout models will be examined, and the results of burnout syndrome will be explained. A conceptual framework will be presented to describe the effect of working conditions in the maritime sector on burnout and the causal relationship between burnout syndrome and accidents and incidents. Sun, 01 Jan 2023 00:00:00 GMT https://hdl.handle.net/20.500.12809/11012 2023-01-01T00:00:00Z https://hdl.handle.net/20.500.12809/9872 Evaluation of Turkish Coffee in the Scope of Gastronomy Tourism Kılınç Şahin, Songül; Taşdemir, S. Evaluation of Turkish Coffee Fri, 01 Jan 2021 00:00:00 GMT https://hdl.handle.net/20.500.12809/9872 2021-01-01T00:00:00Z