Burhanettin Ozdemir

• PhD
• Professor (Assistant) at Alfaisal University

In the present research, we consider a biological model of serum hepatitis disease. We carry out a detailed analysis of the mentioned model along with a class with asymptomatic carriers to explore its theoretical and numerical aspects. We initiate the study by using the piecewise fractal–fractional derivative (FFD) by which the crossover effects wi...

Background Due to the unmet need for valid instruments that evaluate critical components of simulation scenarios, this research aimed to develop and validate an instrument that measures the quality of healthcare simulation scenarios. Methods A sequential transformative mixed-method research design was used to conduct the study. The development and...

Textism, which refers to the special language used in text messaging, is widely used in several forms of communication, such as texting, online chatting and emails. This increased use of textism has alarmed the media and the public because this special language can impact the academic writing of the younger generation. This paper aimed at exploring...

This study aimed to unravel the complex dynamics among accountability, school climate, and teachers’ organizational identity perceptions in three different types of schools: elementary, middle, and high schools. Structural Equation Modeling (SEM) was employed to examine the relationships among accountability, school climate, and teachers’ perceptio...

This research manuscript is devoted to investigate a smoking tobacco cancer model by applying some advanced techniques based on second derivative. The snuffing class is included in the construction of our model. The stability of the spread of the cancer disease due to tobacco is examined using the reproductive number concept. It is also advisable t...

In this paper, we develop a new mathematical model for an in-depth understanding of COVID-19 (Omicron variant). The mathematical study of an omicron variant of the corona virus is discussed. In this new Omicron model, we used idea of dividing infected compartment further into more classes i.e asymptomatic, symptomatic and Omicron infected compartme...

The computerized adaptive tests (CAT) apply an adaptive process in which the items are tailored to individuals' ability scores. The multidimensional CAT (MCAT) designs differ in terms of different item selection, ability estimation, and termination methods being used. This study aims at investigating the performance of the MCAT designs used to meas...

The purpose of this study is to examine the distractors of items that exhibit differential item functioning (DIF) across gender to explain the possible sources of DIF in the context of large-scale tests. To this end, two non-linear logistic regression (NLR) models-based DIF methods (three parameters, 3PL-NLR and four-parameter, 4PL-NLR) were first...

This study determined the internet addiction profiles of university students with latent class analysis based on their responses to Internet Addiction Test (IAT). The study group consisted of 480 university students. The participants were classified into four groups according to their total score: “normal (0-30), mild (31-49), moderate (50-79) and...

Bu çalışmanın amacı, ölçme ve değerlendirme sürecinde kullanılan sınav türleri bağlamında; öğrencilerin sınava hazırlanma sürecinde benimsemiş oldukları öğrenme yaklaşımlarının (derinlemesine, yüzeysel ve stratejik) ve bu yaklaşımların benimsenmesine neden olan faktörlerin neler olduğu tespit etmektir. Çalışma nitel bir araştırma olup, veri analizi...

This study aims to determine the effect of case-based curriculum (CBC) on the cognitive and affective characteristics of the pre-service teachers. The case-based curriculum was developed within the scope of the "Introduction to Educational Science" course at the university level. It was applied to experimental groups by two different methods that a...

This study focused on to examine prevalence of nomophobia among university students; and the relationship among nomophobia, self-esteem, loneliness and self-happiness with respect to gender and year of study of the university students in Pakistan and Turkey. The study subjects consisted of 729 students 368 (50.5%) of which were from Turkey and 361...

Purpose of Study: The purpose of this study is to examine the psychological structure of self-compassion and to determine the relationship between the sub-dimensions (or factors) of the self-compassion-scale and the contribution of each factor to the construct. Although the self-compassion scale has been commonly used in the area of psychology, the...

The purpose of this study is to compare the performance of Between-item dimensionality-based Multidimensional CAT designs and to examine the effect of content balancing on different MCAT designs. For this purpose, real data set obtained from English Proficiency Test (EPT), which was administered by Hacettepe University between 2009 and 2013 academi...

The purpose of this study is to determine items which have differential item functioning (DIF) in TIMSS 2011 mathematics subtest with three different item response theory (IRT)-based DIF methods and compare results of these methods. For this purpose, DIF values obtained by Lord's Chi-Square, Raju's Area and Likelihood-Ratio Test methods were compar...

Commonality analysis is a method of partitioning the explained variance in a multiple regression analysis into variance constituents associated with each independent variable uniquely and variance associated with common effects of one or more independent variables in various combinations. By partitioning variance, commonality analysis helps to dete...

The aim of this study was to investigate relations between the factors related to Turkish students' reading abilities and the factors related to facilities that both students and families had, according to PISA 2009 results. The main reason that researchers do not employ canonical correlation analysis to determine relationship between the variables...