Dokuma üretimi süresince oluşan kumaş hatalarının belirlenmesine yönelik istatistiksel bi̇r araştırma

Fabric defects that occur during weaving production causes wastage at garment production. If fabric defects can not be detected during garment production, causes separation of the finished product as second quality. In this study, in a weaving mill, raw fabrics were inspected during three weeks for defect detection after weaving operation and results were investigated using statistical methods. Detected fabric defects has been classified and noted on quality control charts. For statistical investigation of number of defects pareto analysis and p control charts were used from statistical process control methods

Foaming behavior of Ti6Al4V particle-added aluminum powder compacts

The foaming behavior of 5 wt.% Ti6Al4V (Ti64) particle (30–200 μm)-added Al powder compacts was investigated in order to assess the particle-addition effects on the foaming behavior. Al compacts without particle addition were also prepared with the same method and foamed. The expansions of Ti64 particle-added compacts were measured to be relatively low at small particle sizes and increased with increasing particle size. At highest particle size range (160–200 μm), particle-added compacts showed expansion behavior similar to that of Al compacts without particle addition, but with lower expansion values. Expansions studies on 30–45 μm size Ti64-added compacts with varying weight percentages showed that the expansion behavior of the compacts became very similar to that of Al compact when the particle content was lower than 2 wt.%. However, Ti64 addition reduced the extent of drainage. Ti64 particles and TiAl3 particles formed during foaming increased the apparent viscosity of the liquid foam and hence reduced the flow of liquid metal from cell walls to plateau borders. The reduced foamability in the compacts with the smaller size Ti64 addition was attributed to the relatively high viscosities, due to the higher cumulative surface area of the particles and higher rate of TiAl3 formation between liquid Al and Ti64 particles.TÜBİTAK for the grant #106M18

Controlled Synthesis Of Vinyl Amine Polymers By Raft Technique

Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2008Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2008Vinil amin polimerleri, amino gruplarının kolay dönüştürülebilme özelliğinden ötürü, gerek akademik araştırmalarda gerekse endüstride önemli bir yere sahiptir. Ancak vinil amin monomeri mevcut değildir. Vinil amin polimerleri, poli (N-vinil ftalimid) ve poli (N-vinil asetamid) benzeri polimerlerin hidrolizi ile elde edilir. Son yıllarda ticari hale gelen N-vinilformamid monomeri, poli (vinil amin)in en önemli çıkış maddesidir. N-vinil formamit radikal yolla polimerleşebilen bir monomerdir. Poli (vinil amin) blok kopolimerleri, fonksiyonel blok kopolimerlerin elde edilmesinde çok yararlıdır. Bu tür yapılar kontrollü radikal polimerizasyon teknikleri ile oluşturulabilir. Kontrollü radikal polimerizasyon teknikleri içinde ATRP, N-vinilformamidin polimerleştirilmesi için uygun değildir. Bir başka kontrollü radikal polimerizasyon tekniği olan RAFT bu monomerin polimerleştirilmesi için uygulanabilir görünmektedir. RAFT prosesinde transfer ajanının yapısı, zincir büyüme kontolünde çok önemli olduğu için bu çalışmada N-vinilformamidin kontrollü polimerizasyonunda yeni bir zincir transfer ajanı olan fenasil morfolinditiokarbamat kullanılması amaçlanmıştır. Bu çalışmada aynı zamanda N-vinilformamidin stiren ile blok kopolimerleri sentezlenmiştir. Elde edilen kopolimerler, bir bloğunun amin fonksiyonlu olması nedeniyle nano yapılı kompozitlerin önemli bir parçası olarak oldukça yararlıdır.Vinyl amine polymers are of great interest in academia and industry due to easy transformation of the amino group. However, vinyl amine monomer does not exist. Its polymers can be obtained by hydrolysis of poly (N-vinyl phtalimide) and poly (N-vinyl acetamide) etc. Recently commercialized N-vinyl formamide is the most important precursor for poly (vinyl amine) at this time. This is the monomer radically polymerizable. Block copolymer of poly (vinyl amine) would be very useful to obtain copolymers having functional blocks. Such structures can be designed by controlled radical polymerization techniques. Among those ATRP is not suitable for controlled polymerization of N-vinyl formamide. Another controlled radical polymerization technique RAFT seems to be applicable for polymerization of this monomer. Since structure of the transfer agent is crucial for the chain growth control in RAFT process, in this study we have targeted to employ a new chain transfer agent, phenacyl morpholindithiocarbamate for controlled polymerization of N-vinylformamide. In the study, its block copolymers with styrene were synthesized. The resulting copolymers would be very useful as integral part of nanostructured composite materials due to amine functionality of one block.Yüksek LisansM.Sc

A Case of Juvenile Ankylosing Spondylitis associated with Familial Mediterranean Fever

An eight year old male who was detected to have homozygous M694V mutation in the examinations for recurrent abdominal pain and familial history of Familial Mediterranean Fever (FMF) and who was then diagnosed with Juvenile Ankylosing Spondilitis (JAS) upon examination for hip joint pain was presented. This case was presented to emphasize the importance of high suspicion for JAS in FMF cases with atypical joint findings

An Analysis of Physical and Psychological Expectations of Earthquake Victims from Temporary Shelters: A Design Proposal

This study analyzes physical and psychological expectations of earthquake victims from temporary shelters and presents a design proposal. Interviews were conducted with earthquake victims in the city of Kocaeli in Turkey, and needs were identified. Also, user survey results from previous studies that have been conducted after the August 17th earthquake in 1999 were used to establish the design requirements for a temporary housing unit. While lack of space and issues of crowding, noise, and hygiene were mentioned as the most important problems in temporary earthquake shelters, suggestions to improve them included consideration of psychology and privacy needs of victims. The need for a "home" and not just a shelter has been identified and design guidelines have been examined.Publisher's Versio

SELFormer: Molecular Representation Learning via SELFIES Language Models

Automated computational analysis of the vast chemical space is critical for numerous fields of research such as drug discovery and material science. Representation learning techniques have recently been employed with the primary objective of generating compact and informative numerical expressions of complex data. One approach to efficiently learn molecular representations is processing string-based notations of chemicals via natural language processing (NLP) algorithms. Majority of the methods proposed so far utilize SMILES notations for this purpose; however, SMILES is associated with numerous problems related to validity and robustness, which may prevent the model from effectively uncovering the knowledge hidden in the data. In this study, we propose SELFormer, a transformer architecture-based chemical language model that utilizes a 100% valid, compact and expressive notation, SELFIES, as input, in order to learn flexible and high-quality molecular representations. SELFormer is pre-trained on two million drug-like compounds and fine-tuned for diverse molecular property prediction tasks. Our performance evaluation has revealed that, SELFormer outperforms all competing methods, including graph learning-based approaches and SMILES-based chemical language models, on predicting aqueous solubility of molecules and adverse drug reactions. We also visualized molecular representations learned by SELFormer via dimensionality reduction, which indicated that even the pre-trained model can discriminate molecules with differing structural properties. We shared SELFormer as a programmatic tool, together with its datasets and pre-trained models. Overall, our research demonstrates the benefit of using the SELFIES notations in the context of chemical language modeling and opens up new possibilities for the design and discovery of novel drug candidates with desired features.Comment: 22 pages, 4 figures, 8 table

The Effect of Project Based Learning Approach on Computational Thinking Skills and Programming Self-Efficacy Beliefs

The aim of this study is to reveal the effect of project use on students' self-efficacy beliefs towards programming and their computational thinking skills. A one-group pretest-posttest experimental design was used in the study. The research was conducted in 2018 with 14 12th-grade students in a Vocational and Technical High School in Izmir. In the research, the application of project use in programming teaching lasted 18 weeks. The research data were collected with the Self-Efficacy Scale for Programming (SESP) developed by Altun and Mazman (2012) and the Computer Thinking Skill Levels Scale (CTSLS) developed by Korkmaz, Çakır, Özden, Oluk, Sarıoğlu (2015). Wilcoxon Signed Ranks Test, one of the nonparametric tests, was used to analyze the research data. As a result of the study, it was observed that the use of projects in programming instruction had a positive effect on students' self-efficacy in programming, while it did not have a significant effect on their computational thinking skills. Based on the results of the research, it is recommended to teach block-based programming before text-based programming, to include game-themed activities, to ensure active participation of students, and to use multidimensional and alternative measurement tools to measure computational thinking skills to comprehend algorithm stages in programming instruction

Bilişim Etiği Öğretimi Uygulaması

The purpose of this study was to investigate effectiveness of “Information Technology (IT) Ethics Education Program” (BEÖP), to identify effects of this training on attitudes of students towards IT ethics and to evaluate attitudes of students towards this learning activity. A quasi-experimental pretest-posttest design was used in this study. For this study, a five-week education program consisting of subjects related to IT, ethics, IT ethics, privacy, intellectual property, copyright, patents, license agreements, freedom of speech and IT abuse was developed. Participants of the study were 48 students consisting of 26 girls and 22 boys from one middle school in Izmir in 2012-2013 Fall Semesters. In the study, in order to identify attitudes of students towards ethical use of IT, “IT Ethics with Real Life Case Studies Scale” (GYDSBE) was used. In order to find out the opinions of participants about this learning activity, “IT Ethics Education Program Questionnaire” (BEÖPÖG) was used. According to the research results, BEÖP has positive effects on attitudes of experiment group towards ethical use of IT. In addition to this, there is no significant difference between ethical use of IT and gender. Considering opinions of students about this learning activity, all students in experiment group stated that they all enjoyed participating in BEÖPBu araştırmanın amacı; hazırlanan “Bilişim Etiği Öğretim Programı”nın (BEÖP) öğrencilerin bilişim teknolojilerinin etik kullanımına yönelik tutumlarına etkisini belirlemek ve öğrencilerin bu uygulamaya yönelik görüşlerini değerlendirmektir. Bu araştırma, öntest-sontest kontrol gruplu yarı deneysel bir çalışmadır. Araştırma kapsamında bilişim teknolojisi, etik, bilişim etiği, mahremiyet, fikri mülkiyet, telif hakları, patentler, lisans anlaşmaları, ifade özgürlüğü ve bilişim suçları konularını kapsayan beş haftalık bir öğretim programı hazırlamıştır. Araştırmaya 2012–2013 eğitim öğretim yılında İzmir ilinde 6. sınıfta öğrenim görmekte olan 26 kız ve 22 erkek olmak üzere toplam 48 öğrenci katılmıştır. Araştırmada katılımcıların bilişim teknolojilerinin etik kullanımlarına yönelik tutumlarını belirlemek için “Gerçek Yaşam Durum Senaryolarıyla Bilişim Etiği (GYDSBE) Ölçeği”; öğretim programına yönelik görüşlerini değerlendirmek için ise “Bilişim Etiği Öğretim Programı Öğrenci Görüşleri (BEÖPÖG) Anketi” kullanılmıştır. Araştırma sonuçlarına göre BEÖP öğrencilerinin bilişim teknolojilerinin etik kullanımına yönelik tutumlarını olumlu yönde etkilerken cinsiyete göre anlamlı bir fark bulunmamıştır. Deney grubu öğrencilerinin tamamı BEÖP uygulamasına katılmanın hoşlarına gittiğini belirtmiştir