1,014 research outputs found

    Estimation of Number of Flight Using Particle Swarm Optimization and Artificial Neural Network

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    The number of flight (NF) is one of the key factors for the administration of the airport to evaluate the apron capacity and airline companies to fix the size of the flight. This paper aims to estimate the monthly NF by performing particle swarm optimization (PSO) and artificial neural network (ANN). Performed PSO-ANN algorithm aims to minimize the proposed evaluation criterion in the training stage. PSO-ANN based on the proposed evaluation criterion offers satisfying fitness values with respect to correlation coefficient and mean absolute percentage error in the training and testing stage

    Organizational Justice Perception of Work Performance and Relationship of Work Performance with the Organizational Opposition Level: A Study on Physical Education and Sports Teachers (Istanbul Province Example

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    The aim of this study is to examine the relationship between the job performance of physical education and sports teachers and their level of organizational justice and opposition. The study group was composed of 575 physical education and teachers of sports who were selected by the simple random method among individuals who worked as physical education and sports teachers in the state schools affiliated to the Istanbul Provincial Directorate of National Education in the 2019-2020 academic year. Data collection methods and tools used in this research; personal information sheet, job performance, organizational justice and organizational opposition scales were implemented. The obtained data were recorded with IBM SPSS 22.0 (version) package program and the all analyzes were accomplished with this statistics program. Descriptive information, subtitles and total scores of the scales were given by determining the frequency (f) and percentage (%) values. Correlation analysis was used as a statistical procedure. As a result, while there was no correlation between physical education and teachers of sport job performance and procedural justice, one of the subtitles of perception of justice, a low level of negative correlation was found between interaction, distributive justice and attitude towards organizational justice total score. Again, no relationship was found between job performance and the total score of vertical and horizontal opposition and organizational opposition which are sub-headings of organizational opposition. This may be due to the fact that administrators do not adequately reward the job performances of physical education and sports teachers due to increasing interest of managers towards teachers who conduct lessons for exams important in terms of students. In addition, it is thought to be caused that physical education and sports teachers do not have any difficulties in expressing themselves due to both their professional competencies and their self-expression and high communication skills that physical education and sports bring them

    elastography in primary open-angle glaucoma

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    Objective: The aim of this study was to compare sonoelastographic findings in the retina-choroid-sclera (RCS) complex and vitreous in glaucomatous and healthy eyes.Methods: For this cross-sectional comparative study, 20 patients with primary open-angle glaucoma and 20 healthy volunteers were recruited. Ultrasound elastography measurements were taken with a sonographic scanner of the RCS complex, anterior vitreous (AV), posterior vitreous (PV), retrobulbar fat tissue (RFT), optic disc (OD) and optic nerve (ON) in each eye.Results: The elasticity index of the RCS complex, RFT, OD, ON, AV and PV was similar in both groups (p > 0.05), although the AV/PV strain ratio in the group of patients with glaucoma was significantly higher (p = 0.04).Conclusion: Glaucoma increases the AV/PV strain ratio. In providing reproducible and consistent values, the real-time elastography (RTE) technique may be helpful in elucidating the mechanisms of glaucoma in some aspects.Advances in knowledge: This study can help to evaluate the elasticity of the RCS complex and vitreous in glaucomatous eyes with RTE

    Assessment of optic disc and ganglion cell layer in diabetes mellitus type 2

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    The purpose of this study was to compare the optic disc parameters, retinal nerve fiber (RNFL), and macular ganglion cell layers between patients with diabetes mellitus (DM) type 2 and healthy controls. In this cross-sectional study, 69 eyes of 69 diabetic patients without diabetic retinopathy and 47 eyes of 47 healthy controls were included. Optic disc parameters (i.e., rim area, disc area, cup to disc ratio, cup volume), RNFL, and macular ganglion cell-inner plexiform layers (GCL+IPL) thickness were measured by means of spectral domain optical coherence tomography. There were not statistically significant differences between the diabetic patients and healthy controls in terms of RNFL thickness (P=.32), rim area (P=.20), disc area (P=.16), cup volume (P=.12), and average macular GCL+IPL thickness (P=.11). Nevertheless, binocular RNFL thickness symmetry percentage (P=.03), average cup to disc ratio (P=.02), and superior-nasal macular GCL+IPL thickness (P=.04) were statistically significantly different in the diabetic and control groups. Diabetic patients without retinopathy have more binocular RNFL thickness asymmetry, higher cup to disc ratio, and thinner sectoral macular GCL+IPL when compared to healthy controls. Our results may support the statement that DM causes inner retinal neurodegenerative changes. © 2017 the Author(s). Published by Wolters Kluwer Health, Inc

    Effects of some acids, bases and salts on the morphology of polyurethane nanofibres

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    The polyurethane nanofibres have been prepared by electrospinning and the effects of different types of acids, bases, and salts on nanofibre diameters within the polyurethane solutions are studied. Nanofibre diameters are measured with the SEM and the changes in nanofibre morphology are investigated by considering the electrical conductivity, viscosity, and surface tensions of dopants. Deterioration is observed in the nanofibre morphology in the presence of acid, whereas the nanofibres obtained in the presence of salt are found smoother, longer and thinner. Homogeneous, fine and smooth nanofibres are obtained from salt-doped polyurethane solutions

    Effects of some acids, bases and salts on the morphology of polyurethane nanofibres

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    65-71The polyurethane nanofibres have been prepared by electrospinning and the effects of different types of acids, bases, and salts on nanofibre diameters within the polyurethane solutions are studied. Nanofibre diameters are measured with the SEM and the changes in nanofibre morphology are investigated by considering the electrical conductivity, viscosity, and surface tensions of dopants. Deterioration is observed in the nanofibre morphology in the presence of acid, whereas the nanofibres obtained in the presence of salt are found smoother, longer and thinner. Homogeneous, fine and smooth nanofibres are obtained from salt-doped polyurethane solutions

    ARE SCIENCE TEACHERS REALLY AWARE OF THE IMPORTANCE OF EDUCATIONAL RESEARCH?

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    Teachers are expected to consider the implications of recommendations made in educational research. In-service teachers are primary actors who play a leading role in education, so their attitudes towards educational research and researchers are more important than those of pre-service or trainee teachers. This study aims to find out in-service science teachers’ attitudes towards education research and some the factors that affect them such as gender, teacher’s subject area, seniority, and postgraduate research area. The research data was obtained using a Likert-type scale developed by Ilhan, Şekerci, Sözbilir & Yildirim (2013). The study sample included 108 in-service high school science teachers from Turkey. The results show that in-service science teachers find educational research applicable and necessary but of limited value. Teachers who graduated from education faculties have more positive attitudes towards educational research and teachers who are newly appointed to the profession have a better understanding of the utilities and value of educational research. This study emphasizes and underlines that science teachers’ attitudes towards the value of educational research are under the targeted level. In order to adequately support science teachers and provide them with the intended competencies of their curricula, this study provides some implications for both teachers and researchers in science education.  Article visualizations

    EVALUATION OF ADMINISTRATIVE EFFECTIVENESS LEVELS OF ACADEMICIANS: FACULTY OF SPORT SCIENCES AND SCHOOL OF PHYSICAL EDUCATION AND SPORTS EXAMPLE

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    Background/Objective: The purpose of this study is to examine the managerial effectiveness levels of the academicians who work in the sports science faculty and School of Physical Education and Sports.Methods: In the study, a descriptive scanning method aimed at revealing the current situation has been used. For the purposes of this study, the academicians population of Turkey in the research universities working in sports science and sports colleges with the faculty of physical education, from which a sample is chosen, which is determined by simple random sampling method, which consists of volunteer academicians (n=178) working at the faculties of sport sciences and school of physical education and sports of universities such as Erciyes, Selçuk, Ömer Halisdemir, Gaziantep, Dumlupınar, Uşak, Karamanoğlu Mehmet Bey, Fırat, Süleyman Demirel, Sakarya, Balıkesir, Gelişim, Esenyurt, Muğla Sıtkı Koçman ve Bingöl universities. A managerial efficacy scale developed by Murry (1993) and implemented in the Turkish version by İra and Şahin (2010) was used to measure managerial effectiveness. The obtained data was recorded with the package program "IBM SPSS 22". Kruskal Wallis analysis was applied as statistical process.Results: The level of managerial effectiveness of academicians is moderate and advanced, the level of managerial effectiveness is related to age, department, title and professional experience, and also there is a relation between the progress of age, title and professional experience of academicians and the development of managerial effectiveness. It can be assumed that this situation originated from the situations such as the maturity of academicians' knowledge and experience, efforts to improve their skills, the adoption of the management concept of modern life, self-evaluation and autonomy as well as being able to adapt to scientific, cultural and social changes. The development of managerial effectiveness perceptions and managerial skills of young academics can be supported by managerial development seminars. Determining the managerial perceptions of the faculty members who work in different faculties and higher schools may contribute to the updating of the managerial perspective.  Article visualizations

    Ocular complications of diabetes mellitus

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    Diabetes mellitus (DM) is a important health problem that induces ernestful complications and it causes significant morbidity owing to specific microvascular complications such as, retinopathy, nephropathy and neuropathy, and macrovascular complications such as, ischaemic heart disease, and peripheral vasculopathy. It can affect children, young people and adults and is becoming more common. Ocular complications associated with DM are progressive and rapidly becoming the world's most significant cause of morbidity and are preventable with early detection and timely treatment. This review provides an overview of five main ocular complications associated with DM, diabetic retinopathy and papillopathy, cataract, glaucoma, and ocular surface diseases

    EVALUATION OF THE CORRELATION BETWEEN TIME MANAGEMENT PERCEPTIONS AND TIME MANAGEMENT BEHAVIORS OF SPORT MANAGEMENT STUDENTS

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    The aim of this study is to examine the correlation between the future perceptions of the students of the sports management department and their time management behavior. For this purpose, Gazi, Selçuk, Muğla and Fırat University Sports Sciences Faculty, Sports Management students (n = 770) participated in the questionnaire voluntarily. The socio-demographic information form of the volunteers was applied to the future time perception scale developed by Husman and Shell (1996) and the Time Management Behavior Scale developed by Britton and Tesser (1991). The obtained data was recorded with the package program "IBM SPSS 22". Mann Whitney U, Kruskal Wallis, Spearman Correlation Analysis for the Correlation between future time sense and time management behavior were applied as a statistical process. As a result, there was a significant Correlation between gender, university and class, time management behaviors, gender, university and class variables. Furthermore, a too weak Correlation was found between the future time sense and the time management behavior on the positive side. This may be due to the students' personal development, social circles, socioeconomic status difference and the missions and visions of the students differ.  Article visualizations
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