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Yayın The development of a hybrid cutting model for workpiece temperature distribution via advection heat partition approach(Springer Science and Business Media Deutschland GmbH, 2023-04-15) Kara, Mehmet Emre; Kuzu, Ali Taner; Bakkal, MustafaThis paper presents a novel hybrid cutting model for the prediction of workpiece temperature distribution during the dry milling process of compacted graphite iron (CGI). The hybrid model consists of an analytical force model based on a mechanistic approach and finite element analysis (FEA) based on the thermal model. The heat generated during the milling process transferred to the workpiece is computed via the advection heat partition model. The workpiece temperature distribution obtained through the heat loads, using as boundary conditions in the FEA, was calculated by means of cutting forces. The developed force and thermal models have been experimentally validated, and good agreement between the measured and calculated results has been observed. The energy and active work calculations show that by doubling the feed during CGI milling, an energy saving of about 10% is achieved despite almost doubling the cutting forces.Yayın Extraction and selection of muscle based features for facial expression recognition(IEEE Computer Soc, 2014-12-04) Benli, Kristin Surpuhi; Eskil, Mustafa TanerIn this study we propose a new set of muscle activity based features for facial expression recognition. We extract muscular activities by observing the displacements of facial feature points in an expression video. The facial feature points are initialized on muscular regions of influence in the first frame of the video. These points are tracked through optical flow in sequential frames. Displacements of feature points on the image plane are used to estimate the 3D orientation of a head model and relative displacements of its vertices. We model the human skin as a linear system of equations. The estimated deformation of the wireframe model produces an over-determined system of equations that can be solved under the constraint of the facial anatomy to obtain muscle activation levels. We apply sequential forward feature selection to choose the most descriptive set of muscles for recognition of basic facial expressions.Yayın İfade tanıma için yüz anatomisine dayalı öznitelikler(IEEE, 2014-04-23) Benli, Kristin Surpuhi; Eskil, Mustafa TanerBu çalışmada yüz ifadesi tanıma için kas kuvvetlerine dayalı yeni öznitelikler öneriyoruz. Yüz üzerinde seçtiğimiz noktaların video üzerindeki hareketlerini izleyerek kas kuvvetlerini çözüyoruz. Yüz noktaları, ilk video çerçevesi üzerinde, kas kuvvet alanları üzerinde ilklendirilir. Bu noktalar optik akış algoritması ile izlenir. Noktaların devinimleri yüzün 3 boyutlu yönelimi ve yüz ifadesine dayalı bağıl devinimleri kestirmek için kullanılır. İnsan yüzünü yaylarla, artık-belirtilmiş doğrusal bir denklem sistemi olarak modelliyoruz. Bu sistemi yüz anatomisi kısıtı altında, kas kuvvetleri için çözüyoruz. Ardışık ileri seçim yaparak, temel yüz ifadeleri için en betimleyici kas kümesini belirliyoruz.Yayın An observation based muscle model for simulation of facial expressions(Elsevier Science BV, 2018-05) Erkoç, Tuğba; Ağdoğan, Didem; Eskil, Mustafa TanerThis study presents a novel facial muscle model for coding of facial expressions. We derive this model from unintrusive observation of human subjects in the progress of the surprise expression. We use a generic and single-layered face model which embeds major muscles of the human face. This model is customized onto the human subject's face on the first frame of the video. The last frame of the video is used to project a set of manually marked feature points to estimate the 3 dimensional displacements of vertices due to facial expression. Vertex displacements are used in a mass spring model to estimate the external forces, i.e. the muscle forces on the skin. We observed that the distribution of muscle forces resemble sigmoid or hyperbolic tangent functions. We chose hyperbolic tangent function as our base model and parameterized it using least squares. We compared the proposed muscle model with frequently used models in the literature.Yayın Günümüz sanatındaki yeni portre yaklaşımları: yüz ve maske(Işık Üniversitesi, 2013-05-30) Bağatur, Bulut; İslimyeli, Balkan Naci; Işık Üniversitesi, Sosyal Bilimler Enstitüsü, Resim Yüksek Lisans ProgramıYüz-Maske-Persona Keywords Form Face-Mask-Persona Bu tezin temel amacı, değişim ve dönüşüm unsuru olan maskenin ilkel toplumlardan günümüze kadar olan kullanımı, kullanım alanları, günümüz sanatına olan etkilerini örnekleriyle ortaya koymaktır. Bu tezde öncelikli olarak genel maske kavramından, ortaya çıkış nedenlerinden ve psikolojik temellerinden bahsedilmiştir. Daha sonraki bölümlerde ise maskenin eski ve Uzakdoğu kültürlerindeki yeri, işlevi ve önemi incelenmiştir. Daha sonra ise bu kültürlerin günümüzdeki yansımaları aktarılmıştır. Son olarak maskenin günümüz sanatındaki etkileşimleri ve yorumu sanatçı örnekleriyle ele alınmıştır.Yayın Examining psychological resilience and posttraumatic growth following terrorist attacks in Turkey(American Psychological Association, 2021-06) İkizer, Gözde; Özel, Ebru PelinActs of terrorism, being highly prevalent across the world, disrupt community and social functioning and can lead to negative psychological reactions in individuals. However, positive outcomes can also be evoked after adverse experiences. The current study aimed to explore two salutogenic or positive outcomes—resilience and posttraumatic growth (PTG)—following exposure to terrorist attacks. The sample included 331 university students who were exposed to a terrorist attack in Turkey during the last 18 months prior to data collection. Participants responded to the Connor-Davidson Resilience Scale, the Posttraumatic Growth Inventory, and a participant information form. The relationship between resilience and PTG was examined through correlation analysis and regression analyses with linear and quadratic components. Resilience and PTG were positively correlated. Tendency toward spirituality was the only resilience domain that was significantly correlated with all domains of growth. Total score of resilience was significantly associated with scores on all subscales of the Posttraumatic Growth Inventory except appreciation of life. Results indicated that only linear relationships existed between domains of resilience and PTG in the study sample. The positive and linear association between resilience and PTG suggests that resilience may be an important tool for facilitating growth. After terrorist attacks, mental health care planning should adopt a patient-centered approach that acknowledges the possibility of positive outcomes following traumatic events and focuses on the impact as well as recovery phases in traumatized individuals.
