Fast, Linear Time Hierarchical Clustering using the Baire Metric

The Baire metric induces an ultrametric on a dataset and is of linear computational complexity, contrasted with the standard quadratic time agglomerative hierarchical clustering algorithm. In this work we evaluate empirically this new approach to hierarchical clustering. We compare hierarchical clustering based on the Baire metric with (i) agglomerative hierarchical clustering, in terms of algorithm properties; (ii) generalized ultrametrics, in terms of definition; and (iii) fast clustering through k-means partititioning, in terms of quality of results. For the latter, we carry out an in depth astronomical study. We apply the Baire distance to spectrometric and photometric redshifts from the Sloan Digital Sky Survey using, in this work, about half a million astronomical objects. We want to know how well the (more costly to determine) spectrometric redshifts can predict the (more easily obtained) photometric redshifts, i.e. we seek to regress the spectrometric on the photometric redshifts, and we use clusterwise regression for this.Comment: 27 pages, 6 tables, 10 figure

Problematic online behaviors among adolescents and emerging adults: associations between cyberbullying perpetration, problematic social media use, and psychosocial factors

Over the past two decades, young people's engagement in online activities has grown markedly. The aim of the present study was to examine the relationship between two specific online behaviors (i.e., cyberbullying perpetration, problematic social media use) and their relationships with social connectedness, belongingness, depression, and self-esteem among high school and university students. Data were collected from two different study groups via two questionnaires that included the Cyberbullying Offending Scale, Social Media Use Questionnaire, Social Connectedness Scale, General Belongingness Scale, Short Depression-Happiness Scale, and Single Item Self-Esteem Scale. Study 1 comprised 804 high school students (48% female; mean age 16.20 years). Study 2 comprised 760 university students (60% female; mean age 21.48 years). Results indicated that problematic social media use and cyberbullying perpetration (which was stronger among high school students) were directly associated with each other. Belongingness (directly) and social connectedness (indirectly) were both associated with cyberbullying perpetration and problematic social media use. Path analysis demonstrated that while age was a significant direct predictor of problematic social media use and cyberbullying perpetration among university students, it was not significant among high school students. In both samples, depression was a direct predictor of problematic social media use and an indirect predictor of cyberbullying perpetration. However, majority of these associations were relatively weak. The present study significantly adds to the emerging body of literature concerning the associations between problematic social media use and cyberbullying perpetration

ICAR: endoscopic skull‐base surgery

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Adana bölgesi yeraltı su kaynaklarının kirletilme nedenlerinin incelenmesi

TEZ2461Tez (Yüksek Lisans) -- Çukurova Üniversitesi, Adana, 1997.Kaynakça (s. 128-131) var.xii, [20] 133 s. : rnk. res., hrt. ; 30cm.…Bu çalışma Ç.Ü. Bilimsel Araştırma Projeleri Birimi Tarafından Desteklenmiştir. Proje No: FBE- 95/ 83

Montessori yaklaşımında bütünleştirme uygulamalarına ilişkin Montessori okul öncesi öğretmenlerinin görüşlerinin incelenmesi

The purpose of the study was to investigatethe views of Montessori preschool teachers on inclusive education in Montessori approach. The views of 18 participants wereexamined in thisstudy. All participants wereselected from Ankara and İstanbul and they wereinvestigated by a semi-structured interview protocol thatwas developed by the researcherbased on the literature review.The protocol containedquestions in three major parts; these were demographic questions about participants, questions about views on inclusive education and questions about views oninclusive education inMontessori approach and its advantageous and disadvantageous for childrenwith disabilities. Phenomenologydesignwas employed inthe study and purposive sampling was used to reach the participants. According to findings of content analysis,Montessori teachers stated that they did not find themselves adequately educated and experienced in inclusive education but a large part of them thought that inclusive education is good for development of both disabled and non-disabled students.On the other hand, Montessori teachers expressed that enabling children to be independent and to encourage them to make their own vdecisions are the most important point of Montessori understanding. However, when considered in terms of disabled students, most teachers indicated that such liberal environment could constitute disadvantages for such students. Teachers stated that an educational environment which is structured and where influence of the teacher is more intensive would be better in terms of education of the disabled child, particularly when working with students with severe disabilities or students with attention deficit or autism.Thesis (M.S.) -- Graduate School of Social Sciences. Early Childhood Education