Applied Sciences

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Browsing Applied Sciences by Author "Albayrak, D."

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    Electronic excited states of the CP29 antenna complex of green plants: a model based on exciton calculations
    (Springer / Kluwer Academic Publishers, 2000) İşerı, E. İ.; Albayrak, D.; Gülen, D.
    We have suggested a model for the electronic excited states of the minor plant antenna, CP29, by incorporating a considerable part of the current information offered by structure determination, site-directed mutagenesis, and spectroscopy in the modeling. We have assumed that the electronic excited states of the complex have been decided by the chlorophyll-chlorophyll (Chl) and Chl-protein interactions and have modeled the Coulombic interaction between a pair of Chls in the point-dipole approximation and the Chl-protein interactions are treated as empirical fit parameters. We have suggested the Qy dipole moment orientations and the site energies for all the chlorophylls in the complex through a simultaneous simulation of the absorption and linear dichroism spectra. The assignments proposed have been discussed to yield a satisfactory reproduction of all prominent features of the absorption, linear and circular dichroism spectra as well as the key spectral and temporal characteristics of the energy transfer processes among the chlorophylls. The orientations and the spectral assignments obtained by relatively simple exciton calculations have been necessary to provide a good point of departure for more detailed treatments of structure-function relationship in CP29. Moreover, it has been discussed that the CP29 model suggested can guide the studies for a better understanding of the structure-function relationship in the major plant antenna, LHCII.
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    The impact of software development companies on software engineers' responses to incomplete requirements
    (International Journal of Information Studies, 2009) Albayrak, O.; Albayrak, D.
    It is commonly accepted that software requirements quality affects software product quality, and high-quality software products depend on complete requirements. With incomplete requirements, depending on the requirement software engineers attempt to fi ll gaps differently; either by getting feedback from the user or by making assumptions. Assumptions may be explicit or implicit. Explicit assumptions are preferable to implicit assumptions because explicit assumptions can be validated. We conduct an empirical study to determine whether the number of explicit assumptions made by software engineers is related to the companies that the engineers work for. Using data from eight companies we investigate the responses of 251 software engineers to the same incomplete software requirement. The results of the study show a signifi cant relationship between a software development company and the number of explicit assumptions made by the engineers who work for that company
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    Using social networking sites for teaching and learning: students’ involvement in and acceptance of Facebook as a course management system
    (Sage, 2015) Albayrak, D.; Yildirim, Z.
    This study investigates students’ involvement in Facebook as a course management system (CMS), Facebook acceptance, and the relationships between the two. The study used Facebook as a CMS in two freshman courses and employed mixed method as part of an action-research approach. Forty-two students participated in the study, and 12 of those students were selected for face-to-face interviews through maximum variation sampling. Quantitative data were collected through questionnaires and course Facebook page logs. Qualitative data were collected through the interviews. The quantitative data analysis consisted of descriptive statistics and correlation analyses. The findings indicate that the relationships between course Facebook page involvement and Facebook acceptance differed according to the course. The findings support that Facebook as a CMS has the potential to increase student involvement in discussions and out-of-class communication among instructors and students.