PROBLEM-SOLVING PERFORMANCE AND MATHEMATICS ACHIEVEMENT: THE MEDIATING ROLE OF EYE TRACKING MEASUREMENTS

The purpose of the present study was to propose a model for mathematics achievement considering the mediating role of eye tracking measurements in the relationship between problem solving performance and mathematics achievement. In this sequential explanatory mixed method research design, a geometry test was conducted to 381 7th grade students. Their problem-solving process was recorded using eye tracking technology. Also, their mathematics achievement scores were acquired from their schools. Afterwards, semi-structured interviews were conducted to 15 students. Based on the results, it was observed that there was a positive relationship among problem-solving performance and mathematics achievement while eye tracking measurements were negatively correlated to problem solving performance and mathematics achievement. Qualitative findings also confirmed these results. Moreover, the hypothesized model could approximately express 22% of the variance on mathematics achievement

Ortaokul matematik ög retmeni adaylarının üçgenler konusunda tanım olus turma sürecindeki ög renmeleri

Bu çalışmanın amacı ortaokul matematik öğretmeni adaylarının üçgenlerle ilgili yaptıkları tanımları ve doğru üçgen tanımını oluşturmak için yaptıkları tartışmaları incelemektir. Adayların üçgenleri etkili bir şekilde anlamaları ve öğrenmelerinde başlangıç adımı olan ürettikleri üçgenlerin tanımlarını incelemeleri ve eksiklerini giderilerek doğru tanımı oluşturmaları sağlanmalıdır Böylelikle, üçgen tanımının anlaşılması üçgenlere ait özelliklerin ve teoremlerin öğrenilmesine katkıda bulunabilir. Bu amaçla, çalışmanın katılımcılarını amaçlı örnekleme yöntemiyle seçilen İlköğretim Matematik Öğretmenliği programına kayıtlı üçüncü sınıf 22 ortaokul matematik öğretmeni adayı oluşturmaktadır. Veri toplama süreci, yazılı dokümanların toplanması ve toplu sınıf tartışmalarının metin haline dönüştürülmesinden oluşmaktadır. Bu verilerin analizinde de içerik analizi ve betimsel analiz teknikleri kullanılmıştır. Araştırma sonucunda elde edilen bulgulara göre, katılımcıların oluşturdukları tanımların kritik özelliklerin tamamını içermediği ve bazen de bu özelliklerin doğru bir şekilde ilişkilendirilemediği görülmüştür. Fakat tartışma sürecindeki bu eksiklik ve hataların fark edildiği ve istenilen doğru üçgen tanımının oluşturulabildiği gözlemlenmiştir

Examining Students' Mathematical Understanding of Patterns by Pirie-Kieren Model

The purpose of this study is to investigate students' mathematical understanding of patterns. Three 7th grade students who enrolled in a public school solved the questions regarding the patterns. Semi-structured interviews were conducted with them about their solutions. The data were analyzed by using the Pirie-Kieren theory of mathematical understanding. The findings of this study revealed that students' mathematical understanding varied between first six levels from primitive knowing to observing and their mathematical understanding mostly occurred between Image Making and Formalising layers. In terms of theory, students were able to pass the first and second "Don't Need" boundaries but they could not progress their understanding over the third "Don't Need" boundary. The results also illustrated that all of the students had knowledge about the patterns. In order to find the general rule of the pattern, they mostly endeavored to determine a formula and check its correctness by writing initial three steps

Examining students' geometrical misconceptions by eye tracking

This study was conducted to reveal potential sources of students' difficulty and misconceptions about geometrical concepts with the help of eye tracking. In this study, the students' geometrical misconceptions were explored by answering the questions on the geometry test prepared based on the literature and test-taking processes and represented with the help of eye tracking data to make interpretations about their visual and cognitive attention. With this aim, the mixed method research design was used. The data were collected through the geometry test, eye tracking measurements, and the think aloud strategy. Geometry test scores were represented by descriptive statistics such as percentage. The quantitative eye tracking data were analysed by Kruskal-Wallis tests and Mann-Whitney U-tests among the choices for each question. The qualitative data collected through the think aloud strategy were analysed by the content analysis. In the findings, the students' geometrical misconceptions were examined and reported in detail from a different perspective with the help of data related to eye tracking. Then, eye tracking data and qualitative data showed the geometry misconception items on which the students had difficulty and cognitive conflict in addition to geometrical misconception based on the students' answers to the geometry questions

Matematik Öğretmeni Adaylarının Somut Materyalleri Kullanma Becerilerinin İncelenmesi

Somut materyallerin kullanımı, öğrenciyi aktif halde tutmakta ve daha zengin öğrenme imkânları sunmaktadır. Somut materyaller, matematik öğretimini zevkli hale getirmekte olup öğrencinin motivasyonunu arttırmaktadır. Matematik öğretiminde, matematiksel kavramların öğrenciler tarafından iyi bir şekilde anlaşılması için somut materyallerden yararlanmak gerekir. Bu çalışmanın amacı, ortaokul matematik öğretmeni adaylarının, matematik öğretiminde kullanılan somut materyalleri kullanma becerilerinin incelenmesidir. Çalışmada nitel araştırma yaklaşımına dayalı durum çalışması yöntemi kullanılmıştır. Çalışma grubu, amaçlı örnekleme yöntemi ile belirlenmiştir. Bu doğrultuda çalışmaya bir devlet üniversitesinin Eğitim Fakültesinin 2. sınıfında öğrenim görmekte olan ve Öğretim Teknolojileri ve Materyal Tasarımı dersini alan toplam 45 ortaokul matematik öğretmeni adayı dâhil edilmiştir. Verilerin analizinde, öğretmen adaylarının gözlem yoluyla toplanan ders anlatımlarına dair video kayıtları transkript edilmiştir. Oluşturulan dokümanlar nitel analiz edilmiştir. Çalışmanın bulguları ışığında, öğretmen adaylarının çoğunun somut materyalleri etkili ve amacına uygun olarak kullanamadıkları görülmüştür. Öğretmen adaylarının çoğu, konuyu öğretme amacıyla materyalleri kullanmak isteseler de pekiştirme amaçlı kullanmaktan öteye geçememişlerdir. Somut materyalleri etkili kullanan öğretmen adaylarının da sınırlı sayıda materyal kullandıkları görülmüştür

Results of observational study to determine K-ras mutation rates in 2458 patients with metastatic colorectal cancer in Turkey (TURKRAS Study).

Annual Meeting of the American-Society-of-Clinical-Oncology (ASCO) / Clinical Science Symposium on Predicting and Improving Adverse Outcomes in Older Adults with Cancer -- MAY 29-JUN 02, 2015 -- Chicago, ILWOS: 000358036902641Amer Soc Clin Onco

Evaluation of extensively drug-resistant gram-negative bacteremia among solid-organ transplant recipients: a multicenter study

Background/aim: The aim of this study is to evaluate the distribution, sources, clinical features, and mortality rates of bacteremia due to evaluation of extensively drug-resistant (XDR) gram negative among solid-organ transplant (SOT) recipients. Materials and methods: A retrospective study of SOT recipients with bacteremia due to XDR gram-negative pathogens in 11 centers between 2016 and 2018 was conducted. Patients' records were evaluated. Results: Of 171 bacteremia that occurred in 164 SOT recipients, 93 (56.7%) were liver, 46 (28%) kidney, 14 (8.5%) heart, and 11 (6.7%) lung recipients. Bacteremia episodes were recorded in the first year in 63.7% of the patients (n = 109), early-onset bacteremia was recorded in 45% (n = 77) of the episodes. In multivariate analysis, catheter-associated bacteremia was an independent risk factor for 7-day mortality (p = 0.037), and early-onset bacteremia was found as an independent risk factor for 30-day mortality (p = 0.017). Conclusion: Difficult-to-treat infections due to XDR bacteria in SOT recipients shadow the success of transplantation. Central venous catheters seem to be the main risk factor. Judicious use of medical devices is of pivotal importance

Deferasirox in children with transfusion-dependent thalassemia or sickle cell anemia: A large cohort real-life experience from Turkey (REACH-THEM)

Objectives To evaluate the long-term efficacy and safety of deferasirox therapy in a large observational cohort of children with transfusion-dependent thalassemia (TDT) and sickle cell anemia (SCA) in Turkey. Methods This was a multicenter, prospective cohort study including TDT and SCA patients aged 2-18 years with iron overload (>= 100 mL/kg of pRBC or a serum ferritin [SF] level >1000 mu g/L) receiving deferasirox. Patients were followed for up to 3 years according to standard practice. Results A total of 439 patients were evaluated (415 [94.5%] TDT, 143 [32.6%] between 2 and 6 years). Serum ferritin levels consistently and significantly decreased across 3 years of deferasirox therapy from a median of 1775.5 to 1250.5 mu g/L (P = 30 mg/kg/d (n = 120, -579.6 median reduction, P = 30 mg/kg/d) may be required to achieve iron balance

Original Article The prevalence and diagnostic criteria of health-care associated infections in neonatal intensive care units in Turkey: A multicenter point- prevalence study

Background: Healthcare-acquired infections (HAIs) in the neonatal period cause substantial morbidity, mortality, and healthcare costs. Our purpose was to determine the prevalence of HAIs, antimicrobial susceptibility of causative agents, and the adaptivity of the Centres for Disease Control and Prevention (CDC) criteria in neonatal HAI diagnosis