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    Incorporating AI in foreign language education: An investigation into ChatGPT's effect on foreign language learners
    (Springer, 2024) Karatas, Fatih; Abedi, Faramarz Yasar; Ozek Gunyel, Filiz; Karadeniz, Derya; Kuzgun, Yasemin
    ChatGPT, an artificial intelligence application, has emerged as a promising educational tool with a wide range of applications, attracting the attention of researchers and educators. This qualitative case study, chosen for its ability to provide an in-depth exploration of the nuanced effects of AI on the foreign language learning process within its real-world educational context, aimed to utilize ChatGPT in foreign language education, addressing a gap in existing research by offering insights into the potential, benefits, and drawbacks of this innovative approach. The study involved 13 preparatory class students studying at the School of Foreign Languages at a university in Turkey. The students were introduced to ChatGPT through learning experiences over a span of four weeks by the researcher as a language teacher. The qualitative data collected from the interviews were analysed using thematic analysis. The findings suggest that ChatGPT positively affects students' learning experiences, especially in writing, grammar, and vocabulary acquisition, and enhances motivation and engagement through its versatile and accessible nature in various learning activities. These insights contribute to understanding the utility and constraints of employing ChatGPT technology in foreign language instruction and can inform educators and researchers in developing effective teaching strategies and in designing curricula.
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    The relationship of preoperative and postoperative serum CEA and CA 19-9 levels with tumor localization, stage and overall survival in patients with colorectal cancer
    (2021) Inci, Fatih; Karatas, Fatih
    Aim: To evaluate the prognostic value of pre/postoperative serum levels of Carcinoembryonic antigen (CEA), Carbohydrate antigen 19-9 (CA 19-9), and their relationship with primary localization and stage of colorectal cancer (CRC) patients. Materials and Methods: 255 patients who underwent curative or palliative surgery with the diagnosis of CRC between 2015 and 2020 were included in the study. The patients were divided into groups as right colon tumor and left colon tumor based on the region of the primary tumor. Baseline data on age, sex, location of primary tumor, disease stage, histological differentiation, BRAF and RAS mutation situations and serum CEA and CA 19-9 levels were recorded before and after surgery. Individuals were followed for at least sixty months or until they died. Overall survival (OS) and Disease Free Survival (DFS) rates were estimated using the Kaplan–Meier method.Results: 103 patients had right sided (41.4%) and 152 patients (59.6%) had left sided CRC. Most of the patients were in the early stage (71%). DFS and OS patients with left colon tumors were longer than the right. [(DFS, 32.18 (6-60) vs. 34.25 (6-60) months, p=0.332) and (OS, 41.16 (6-60) vs. 49.05 (11-60) months, p=0.002]. An assessment of the prognosis showed that the OS was significantly worse in the patients with a high CEA level (p=0.001) and in the patients with a high CA 19-9 level (p=0.001). In multivariate analysis, normal serum CA 19-9 levels (p=0.002), RAS wild type tumor (p0.001), early stage disease (p=0.004) were identified as a good prognostic factors for OS of these patients.Conclusion: It was determined that left colon tumors had a longer life span than right side. Elevated levels of CEA and CA 19-9 pre and postoperative in CRC have a worst prognosis than those with normal levels of these markers.