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Öğe Detection of tumor slice in brain magnetic resonance images by feature optimized transfer learning(Aksaray Üniversitesi, 2020) Çelik, Salih; Kasım, ÖmerThis study includes investigating the presence of tumor regions in Magnetic Resonance Imaging (MRI) slices. Since the MRI taken from a patient consists of many slices, it may take time for experts to review these images. The aim of the study is to evaluate the specialist's MRI slices more quickly. The image of each MRI slice taken from the patient was applied to the Alexnet transfer learning algorithm and the properties of the image were obtained. These features are optimized with the Relieff feature selection algorithm to achieve optimum success. The highest accuracy has been achieved with the support vector machine classifier, in which optimized features are used. The study was validated with 3 different combinations by training with two datasets and testing with the other. Thus, a method that can work under different conditions were obtained. The performance metrics of the study were obtained by taking the average of the successes obtained from each data set. MRIs were trained with Alexnet transfer learning model and performance analysis was performed on the obtained classification models. The feature optimization used both increased the success to 97.55% and reduced the processing time from 0.4064 to 0.3045 seconds. The proposed model with a high success rate and a rapid classification is expected to assist the expert in both diagnosis and treatment planning.Öğe Bir üretim sisteminde simülasyon uygulaması(Aksaray Üniversitesi, 2020) Özcan, Burcu; Yıldırak, EdanurSimülasyon yapılacak olan yatırımları, sistem değişikliklerini gerçek hayatta uygulamanın daha maliyetli ve zaman alıcı olduğu durumda değişikliklerin bilgisayar ortamında uygulanmasını ve analiz edilmesini sağlar. Aynı zamanda yeni veya mevcut sistemlere kaynak tahsisi için inceleme ve karar verme konusunda araştırmacılara ve uygulayıcılara yardımcı olmak için yaygın olarak kullanılan bir dizi araç ve yöntemdir. Simülasyon ile modelleme genellikle üretim sistemleri olmak üzere servis sistemleri gibi diğer alanlarda da kullanımı önemli sonuçlar verecek bir yöntemdir. Bu çalışmada ambalaj sektöründe faaliyet gösteren bir üretim işletmesinin ebat-ambalaj bölümünde mevcut durumun işleyişi Arena 14.0 programında modellenmiştir. Simülasyon modelinde 15 iterasyon yapılmıştır. Ambalajlama bölümündeki en büyük problemin ara stoklar olduğu bilinmektedir. Bu nedenle bu bölümde darboğazlara ve üretim karmaşıklığına yol açan durumların analiz edilip çıkan sonuçlara göre çevrim süresini azaltmak, çıkan parça adedini artırmak ve kaynak kullanım oranlarını yükseltmek amaçlanmıştır. Bu doğrultuda çeşitli alternatif senaryolar oluşturulmuştur. Oluşturulan senaryolar Arena 14.0 programında modellenerek birbirleriyle karşılaştırılmış bu senaryolardan en iyi sonuç vereni yeni operatör ve makine tahsisinin birlikte olduğu durum olarak belirlenmiştir. Bu sayede çevrim süresi, makine ve operatör kullanım oranlarında, kuyrukta bekleme sürelerinde önemli azalmalar meydana gelmiştir ve çıkan parça sayısı artmıştır.Öğe The optimum amount of waste glass aggregate that can substitute fine aggregate in concrete(Aksaray Üniversitesi, 2020) Zava, Aper E.; Apebo, Samson N.; Adeke, Paul T.The study that is reported in this paper was carried out to study the effects of glass sand on the properties of concrete and determine the optimum amount of waste glass aggregate that can effectively replace fine aggregate in cement concrete. The objectives of the study were to prepare concrete specimens containing various amounts of glass sand as partial replacement for fine aggregate and to determine the properties of fresh and hardened concrete specimens so produced. It was found that glass sand does not have significant effect on the workability of concrete. The density of concrete containing glass sand was slightly lower than the density of normal concrete by a factor of 1-2%. The presence of glass sand did not alter the established strength-time relation of concrete. The strength of concrete containing glass sand increased progressively with curing time. Glass sand had significant effect on the strength of concrete. A plot of concrete strength and glass sand content was a parabola curving downward. The peak strength, obtained at 10% glass sand content, was 1.2 times the target strength of 25 N/mm2. The study concluded that the optimum amount of glass sand that can effectively substitute river sand in grade C25 concrete is 16% of the proportion of fine aggregate in the concrete. For plain concrete, glass sand alone can be used as fine aggregate. It was recommended that supplementary cementitious materials should be incorporated in the concrete to suppress the deleterious alkali-silica reaction that may take place when glass concrete is exposed to moisture.Öğe Modeling of Ion effect on fermentation for bioethanol production using artificial neural network (ANN)(Aksaray Üniversitesi, 2020) Erdem, Fatma; Özçelik, Dilek; Ergün, MübeccelThe object of this study is modeling the effect of the interaction of Na, Ca and Mg ions on the ethanol fermentation process by using Artificial Neural Network (ANN). The obtained model results were compared with the optimised results by The Response Surface Method (RSM) and the experimental laboratory data obtained before. Model success criteria was measured via the parameters of Mean Squared Error (MSE) and the correlation coefficient (R). ANN model input variables were the concentration of ions Na, Ca and Mg (Ca: 69-2961 g/L, Na: 209-3621 g/L, Mg: 4-253 g/L) and output was percent ethanol yield. ANN training was done with the Levenberg–Marquardt feed forward algorithm and the data was categorised as 75% training, 15% validation and 15% testing. The maximum epoch value was determined as 14 iterations. R2 values of the system were determined as 99% for education, 99% for validation and 99% for the whole biosorption system. MSE value was 0.0004 for education, 0.00381 for validation and 0.0285 for testing. Different activation functions such as logsig, tansig, purelin and different transfer training algorithm such as trainrp, trainbfg, trainlm and others were tried, tansig and trainlm gave the best results with higher R2 value.Öğe Evaluating spatial legibility of the university campus using GIS(Aksaray Üniversitesi, 2020) Bozdağ, Aslı; Gümüş, Münevver Gizem; Gümüş, Kutalmış; Durduran, S. SavaşSpatial legibility is related to the obtainment of spatial information (2D and 3D) that is in the urban area according to the characteristics of the observer who perceives this space. The aim of this research is to examine the spatial legibility of the campus of Selçuk University which is located in Konya province according to the characteristics of the area and the observer. The spatial characteristics of the application area were determined with the analyzes that were conducted with the help of Geographical Information Systems (GIS) and the characteristics of the observer were determined with analyzes that reveal the understanding of the observer to the area (Lynch analysis, questionnaire application and statistical evaluations). When the conducted spatial analyzes and statistical evaluations are examined, it was determined that the spatial legibility of the campus has a statistically significant relationship with the characteristics of the area and the observer.Öğe On some properties of distance in TO-Space(Aksaray Üniversitesi, 2020) Can, ZeynepThe aim of this work is to investigate some properties of the truncated octahedron metric introduced in the space in further studies on metric geometry. With this metric, the 3-dimensional analytical space is a Minkowski geometry which is a non-Euclidean geometry in a finite number of dimensions. In a Minkowski geometry, the unit ball is a certain symmetric closed convex set instead of the usual sphere in Euclidean space. The unit ball of the truncated octahedron geometry is a truncated octahedron which is an Archimedean solid. In this study, first, metric properties of truncated octahedron distance, d_TO, in R^2 has been examined by metric approach. Then, by using synthetic approach some distance formulae in R_TO^3, 3-dimensional analytical space furnished with the truncated octahedron metric has been found.
