Kasap, Yusuf; Köroğlu, Mustafa

This study investigates how student-level sample weights affect model performance in predicting achievement scores. The analyses employed Classification and Regression Tree (CART) and Random Forest (RF) methods with 34 independent variables from the 2018 PISA student survey. Since no prior data mining studies in Turkey have considered sample weights, this research provides an original contribution to the field. According to the findings, when sample weights were used, only one of the ten significant variables identified by the CART method differed, while the order of variable importance also shifted. In the models created with the RF method, only five variables remained common, and the others differed. When sample weights were included in both methods, a slight, statistically non-significant decrease was observed in the prediction performance of the models. These results indicate that sample weights are effective in variable selection but do not significantly affect overall model accuracy. Overall, the findings highlight the necessity of incorporating sample weights to ensure valid and reliable results in large-scale educational data mining.

Yildirim, Fatih; Durmazpinar, Emre

It is observed that the aviation sector plays an important role in the increase of international trade to Türkiye. In addition, the aviation industry offers important benefits in terms of sustainable development, social, political, environmental, and economic factors. In particular, as a service sector, the success of the aviation industry is mainly due to human resource efforts. Employees who are committed to their work and even engaged going beyond are therefore considered to make an important contribution to their organizations. Therefore, the purpose of this study is to determine how ethical climate and organizational control mechanisms affect work engagement. In this direction, data were collected from 387 employees working in an airline company, which is the most valuable brand of Turkey, through a questionnaire. The results of the regression analyses conducted show that the ethical climate dimensions, especially the benevolence and principledness climate dimensions, have a significant and positive impact on work engagement, while the egoistic climate has a significant and negative impact. On the other hand, organizational control dimensions, especially input control and behavioral control, were found to have a significant and positive impact on work engagement. Output control, on the other hand, did not have a significant impact on work engagement. Thus, the importance of the climate of benevolence or principledness to be created in organizations operating in the aviation sector has emerged.

Konyalılar, Nil; Yeter, Mesut

Günümüzde Sivil havacılık sektörünün hızla büyümesi tahmin edilemeyen büyük zorlukları da beraberinde getirmiştir. Bu koşullar altında, bilinen klasik liderlik modelleri daha sınırlı etki düzeyine sahip hale gelmişlerdir. Günümüzde şirketlerin en temel problemleri, rekabet ve performans oluşturmaya olanak tanıyan, etkili liderlere sahip olamamasıdır. Özellikle sektörde yaşanan hızlı büyümeler ve teknolojinin gelişmesi ile, büyük değişikliklere maruz kalan organizasyonlar, karşılaştığı zorlukların üstesinden gelebilmek için değişimi yöneten ve çalışan performansını etkileyebilecek liderlere ihtiyaç duymaktadır. Bu çalışmada havacılık sektöründe önemli bir yere sahip olan yer hizmetleri kuruluşlarında liderlik tarzlarının iş performansı üzerine olan etkisi incelenmiştir. Kapsayıcı liderlik, dönüştürücü liderlik ve iş performansı değişkenlerini kapsayan toplam yirmi sorudan oluşan ölçekler kullanılarak kapsayıcı ve dönüştürücü liderliğin iş performansı üzerindeki etkisi araştırılmıştır. Türkiye de farklı bölgelerde bulunan havalimanlarında yer hizmetleri kuruluşlarında görev yapan 213 çalışandan anket yöntemi ile veriler toplanarak Amos ve SPSS yardımı ile analiz edilmiştir. Yapılan analizler sonucunda kapsayıcı ve dönüştürücü liderlik yaklaşımlarının çalışanların iş performansını olumlu etkilediği, bu liderlik yaklaşımları sergilendiğinde çalışanların fikirlerini daha etkin bir şekilde ifade ettiği ve değişime ortak olarak organizasyon hedeflerini kendi hedefleri olarak benimsediği bu çalışma ile tespit edilmiştir

Bahar, Hüseyın Hüsnü; Öz, Recep; Kayalar, Murat Tolga

The views of lecturers carrying out real laboratory (RL) and virtual laboratory (VL) implementations were analyzed in this study. The descriptive phenomenology design as one of the qualitative research designs was used in the study. The study group was determined using the criterion sampling method. The study was carried out with six lecturers who voluntarily participated into the laboratory and virtual laboratory implementations of a university in the Eastern Anatolia Region. Participating faculty members carried out YÖK Virtual Laboratory implementations besides physics or chemistry laboratory implementations. Semi-structured interview form was used as the data collection tool. During the planning of the study, preliminary interviews were held with the faculty members in order to collect preliminary information and have information about the feasibility of the study. After completing the ethics committee process, a new interview was held with the faculty members making appointments. The interview records were written down after listening to several times, and the information out of the scope of the research was excluded. The answers were grouped categorically, and sub-themes related to each category were determined. The views related to the planning dimension of instruction and preparation for learning were possible to be discussed in three different groups as the views stating that VL was more advantageous, the views stating that RL was more advantageous, and the views that VL and GL provided sufficient opportunities to the lecturer. All the other participants except from one emphasized that RL was more advantageous in terms of correcting incomplete and incorrect learning.