TR Dizin İndeksli Yayınlar Koleksiyonu / TR Dizin Indexed Publications Collections
Permanent URI for this collectionhttps://hdl.handle.net/20.500.13091/4
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Article Relationship between Undergraduates’ Communication Skills and Their Negative Automatic Thoughts(2013) Izgar, Hüseyin; Şirin, Hatice DeveciAim of this study is to present relationships between undergraduates’ communication skill points and their negative automatic thinking frequency points in terms of some demographic variables. Sample of this study consisted of 478 undergraduates (191 females and 287 males) attending Düzce University. “Communication Skills Scale (ISS)” developed by Korkut (1996b), “Automatic Thoughts Scale” developed by Hollan and Kendall (1980) and adapted to Turkish by Şahin and Şahin (1992) and “Personal Information Form” were used in the study. According to the results of the study; it was determined that there is no significant difference between the undergraduates’ communication skill points and negative automatic thinking frequency points according to their gender, their grade and place where their families lived. While undergraduates’ communication skills points do not differ in terms of the department they attend, their negative automatic thinking frequency points differ in terms of their departments. That is, undergraduates attending the department of Nursing have relatively high negative automatic thinking frequency points. It was also observed that there is a medium-level, significant negative correlation between undergraduates’ communication skills and their negative automatic thoughts.Article Development and Performance Analysis of a Hybrid Filtering Method for IMU-Based Dynamic Tilt Sensor(2026) Dereli, İsmail; Erdogan, KemalAdvancements in MEMS (micro-electromechanical systems) technology have significantly improved the accuracy and integration potential of IMU (inertial measurement unit) based tilt sensors across various applications. However, in dynamic environments, external accelerations and vibrations adversely affect sensor performance and this leads to noise. This study proposes a dynamic tilt sensor device integrating a 6-axis IMU and implements multiple filtering strategies, that are Kalman Filter, Moving Average Filter, and Low-Pass Filter aimed at minimizing angle measurement errors. A custom test platform was developed to evaluate filter performance under dynamic conditions. The results, evaluated using RMSE (root mean square error) metrics, show that a specially designed hybrid filtering method combining the three filters achieves an average error of 0.017° in static and 1.178° in dynamic conditions. The findings demonstrate that the proposed hybrid approach offers a reliable alternative comparable to existing solutions in literature, enhancing measurement stability and accuracy in industrial applications.Article Coexistence of Behçet’s Disease and Ankylosing Spondylitis(2013) Karahan, A. Yavuz; Uğurlu, Hatice; Küçüksen, Sami; Bağçacı, Sinan; Şahin, MuhammedBehçet hastalığı (BH) farklı sistemler üzerine etkileri olan bir hastalıktır. Genital ülser, aftöz stomatit ve iritis, üçlü semp- tom kompleksi ile karakterizedir. BH sistemik bir vaskülit olarak kabul edilir. BH daha önceleri spondiloartropati (SSPA) grubu içerisinde kabul edilirdi, ancak BH yi SSPA grubu içerisinde sınıflandırmamak için pek çok neden vardır. Ankilozan spondilit (AS) özellikle aksiyal iskelet tutulumu ile seyreden seronegatif spondilartropati grubunun bir prototipidir. Bu yazıda BH na eşlik eden AS tablosuyla izlenen 33 yaşındaki bir kadın hastayı sunmayı ve bu iki hastalığın birlikteliğini tartışmayı amaçladık.Article A Surrogate Modeling Approach for Digital Hydraulic Valve Systems Using Model- Based Training Data(2026) Çetin, Muhammet Hüseyin; Özalp, Adem Fatih; Polat, RefikIn digital hydraulic systems, flow regulation is achieved by combining the discrete openings of multiple on/off valves. However, performing dynamic simulations for large digital flow control units (DFCU) is computationally intensive. A 16x4 DFCU, for instance, involves 65,536 possible valve states, each requiring separate dynamic evaluation. This work presents ValveNet, a data-based model that uses a feedforward artificial neural network (ANN)to estimate the cost value J, which reflects the pressure and velocity tracking errors. The network was trained on 2,048,000 physics-based samples (4000 random operating combination x 512 valve actions per state) and validated against a benchmark grid of 65,536 valve combinations derived from a simplified model-based type. The compact ANN architecture ([16–8], SCG training) achieved R2=0.998 on validation data and maintained strong correlation with the physical model (R2=0.78–0.99) while showing a 5.7x computational speed-up. ValveNet enables rapid evaluation of complex DFCU configurations. Also, it achieves real-time valve optimization and digital hydraulic control properly.Article “Schindlerin Listesi” Soykırım Öyküsünden Sinema-Mimarlık Arakesitinde “Berlin Yahudi Müzesi” Mekansal Çözümlemeleri(2019) Bala, Havva AlkanBu çalışmada insanlık tarihinin dramatik hallerinden soykırımı, sinema sanatında Schidlerin Listesi (Schindler's List, Steven Spielberg, 1993) filmi ve mimarlık sanatında Daniel Liebenskind ‘ın Yahudi müzesi üzerinden çözümlemeye çalışılmıştır. Diğer bir deyişle bu çalışma, Berlin Yahudi müzesini mimarı bir eser olarak Schidlerin Listesi, filmindeki bilişsel hafızası ile karşılaştırmayı ve desteklemeyi denemektedir. Mimarlık ve sinema sanatı yoluyla bellek kavramı bir anlatı ve ifade aracı haline dönüştürülerek benzerlik ve farklılıklar açığa vurulmaktadır. Yahudi müzesi inkâr edilen ve unutturulmak istenen hatıraların neredeyse bir reenkarnasyonu gibidir. Diğer bir deyişle, bu müze temsili bir mekânın üretimini açığa vurmaktadır. Bu dışa vurum “özür dileme eylemini” sergilemek ve ezilen insanların deneyimlerini empati olarak yeniden formüle etmekle sağlanmaktadır. Bina ve mekânsal kurgusu kolektif hafızayı canlı tutmaktadır. Bu canlılık ancak insanlık tarihi boyunca yapılan haksızlıkların, adaletsizliklerin neden olduğu yıkımlardan alınan derslerin sembolik uyarısıdır. Benzer hatalardan kaçınılması gerektiğine dair mekânsal bir vurgudur. Mimarlık, Yahudi müzesi yoluyla bir sanat olarak kendi payına düşeni yapmayı amaçlarken sinema sanatında Schindler’in listesi filmi ile katledilen Yahudilerin hikâyesini anlatarak sinematografik bir hafıza inşa etmiştir.Article Yeni bir geç Kapitaniyen (Orta Permiyen) foraminifer cinsi (Neodiscidae) Elmadağ Olistostromu, Orta Anadolu (Ankara, Türkiye)(2026-04-13) Akbas, MelikanÜst Kretase Elmadağ Olistostromu, çeşitli boyutlarda, tiplerde (platform tipi karbonat, pelajik tip karbonat ve çört) ve farklı periyot/serilere ait (Karbonifer, Permiyen ve Jura-Kretase) çok sayıda blok içeren, İntra-Pontid Okyanusu'nun önülke fliş çökelleriyle karakterizedir. Bu çalışmada, Elmadağ Olistostromu'ndan derlenen bol fosilli bir karbonat bloğu, foraminifer toplulukları açısından incelenmiştir. Çeşitli geç Kapitaniyen foraminifer topluluğunun yanı sıra, Praeglobidiscus adlı yeni bir cins tanımlanmış ve Globidiscus cinsinin olası atası olarak önerilmiştir. Bu iki cins morfolojik olarak benzerdir, ancak Praeglobidiscus'un son sarılımlarındaki keskin üçgen çıkıntılar tek taraflı iken, bu Globidiscus'ta çift taraflıdır.Article Tarihi minarelerin sismik davranışının incelenmesi: Şeyh Sadreddin Konevi Camii minaresi örneği(2026) Şakalak, Elifnur; Dondüren, Mahmud SamıMinarets, an integral part of mosques, have a thin and delicate structural form. Due to their structural form, they are very sensitive to dynamic loads, especially earthquakes. A detailed examination of the structural behaviors they exhibit under earthquake effects is of great importance for the protection of such historical and cultural heritage structures. In this study, the dynamic behavior of the historical Şeyh Sadreddin Konevi Mosque minaret in Konya under earthquake effects was evaluated. The 3D model of the structure was created using the SAP2000 V23.1 program. Modal analysis and nonlinear time history analysis were performed on the model. The analyzes were carried out in accordance with the 2018 Turkey Building Earthquake Code, and acceleration records of the 2023 Kahramanmaraş earthquakes (Pazarcık Earthquake and Elbistan Earthquake) were used. In line with the obtained results, the displacements and stresses occurring in the minaret were determined, and the regions with the highest these values were identified.Article Sonicated Mucilage from Defatted Flaxseed Meal as a Sustainable Natural Gum: Functional and Thermal Characterization(2026-03-16) Yaver, Elif; Kan, Yüksel; Kan, AsumanFlaxseed mucilage mainly consists of soluble fibers in the outermost layers of the seed. Because of its unique functional properties, such as water holding capacity, water absorption capacity, oil holding capacity and emulsion activity, it can be used as a natural gum in the food industry. Flaxseed mucilage can also exhibit certain health benefits, including anti-obesity, anti-diabetes, anti-cholesterol and antioxidant activities. In the current study, flaxseed mucilage was extracted from meal, which is a cold-pressed flaxseed oil by-product, by two different extraction methods: conventional extraction (3 h stirring at 50℃) and ultrasound-assisted extraction. The influences of ultrasound-assisted extraction at different durations (10, 20 and 30 min) on the yield, color, functional and thermal properties of flaxseed mucilage were compared with the conventional method. The maximum mucilage yield (17.46%) was obtained with ultrasound-assisted extraction for 30 min. Compared to the conventional method, ultrasound-assisted extraction elicited higher L* and whiteness index values in mucilage samples. Moreover, flaxseed mucilage extracted by ultrasound-assisted extraction for 30 min had greater water holding capacity, water absorption capacity and solubility than the other mucilage samples. Besides that, the water and oil absorption capacities of flaxseed mucilage extracted by ultrasound-assisted extraction for 30 min were comparable to xanthan gum, and its solubility was higher. Gelatinization enthalpy (ΔH) values of mucilage samples extracted by conventional and ultrasound-assisted extraction methods were similar (p>0.05). The findings elucidated that flaxseed mucilage extracted from flaxseed meal by ultrasound-assisted extraction (30 min) is a natural, non-toxic and sustainable option for commercial gums, with high yield and good functional properties.Article Investigation of Machinability and Tool Wear of Polymer Concrete(2026-03-01) Ekem, Hakkı; Koklu, Ugur; Şahin, Ömer SinanPolymer concrete, also known as mineral casting, is a composite material renowned for its exceptional mechanical properties and durability, and has garnered significant interest in various engineering applications. However, achieving optimal machinability—particularly in terms of thrust forces and tool wear—remains a critical challenge. This study investigates the relationship between processing parameters and machinability characteristics of polymer concrete, with a particular focus on thrust forces, chip formation, and tool wear. Hole drilling tests were carried out using a Quaser-MV 154C CNC 3-axis vertical machining center, and thrust forces were measured online using a Kistler 9257B force dynamometer. HSS and carbide drills were employed in the experiments. The results show that the use of a carbide drill resulted in lower thrust forces, reduced entry and exit damage, and minimal tool wear compared to the HSS drill. Higher thrust forces were observed at low spindle speeds when using the HSS drill. Overall, the findings indicate that drilling polymer concrete requires the use of a carbide drill, high spindle speeds, and a medium feed rate to minimize hole damage and tool wear.Article Elektromobilitede Tahmine Dayalı Modelleme: Bir Zaman Serisi Analizi(2026-03-03) Kaya, Ersin; Urfalı, Rana BedirBu çalışma, gelecekteki eğilimleri tahmin etmek amacıyla, bir ildeki elektrikli bisiklet kullanımını zaman serisi modelleri ile analiz etmektedir. Sürdürülebilir ulaşımın kritik bir parçası olan elektrikli bisikletler, kentsel hareketliliği ve talep tahminini iyileştirir; bu da elektrikli bisiklet paylaşım sistemleri yönetimi için hayati önem taşır. Tahminler ilk olarak yalnızca bisiklet kullanım verileriyle tek değişkenli modeller (ARIMA, Prophet, SSA) kullanılarak yapıldı. Ardından, sıcaklık, yağış ve rüzgar hızı gibi dış etkenleri dahil eden çok değişkenli yaklaşımlara (SARIMAX, Multivariate Prophet, MSSA) geçildi. Bu sayede veri seti, çevresel etkileri yakalamak için meteorolojik değişkenlerle birleştirildi. Model performansı RMSE ve MAE metrikleriyle değerlendirildi. Sonuçlar, doğrulukta bölgesel farklılıklar olduğunu gösterdi: ARIMA, tek değişkenli modeller arasında dört bölgede en iyisiydi, ancak SARIMAX ve Multivariate Prophet çoğu bölgede üstün tahminler üretti. Ayrıca MSSA, dış etkileri dahil etmenin faydasını vurgulayarak 13 bölgede SSA'yı sürekli olarak geride bıraktı. Genel bulgular, hava durumu verilerini entegre etmenin tahmin hassasiyetini artırdığını ve daha iyi operasyonel stratejileri desteklediğini ortaya koymaktadır. Bu yaklaşım, elektrikli bisiklet paylaşım hizmetlerini ve şehir içi ulaşım planlamasını optimize ederek daha verimli kaynak kullanımına ve yüksek kullanıcı memnuniyetine katkıda bulunmaktadır.