Yazar "Görgünoglu, Salih" seçeneğine göre listele

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    Cropped quad-tree based solid object colouring with cuda
    (2013) Çavuşoğlu, Abdullah; Şen, Baha; Özcan, Caner; Görgünoglu, Salih
    In this study, surfaces of solid objects are coloured with Cropped Quad-Tree method utilizing GPU computing optimization. There are numerous methods used in solid object colouring. When the studies carried out in different fields are taken into consideration, it is seen that quad-tree method displays a prominent position in terms of speed and performance. Cropped quad-tree is obtained as a result of the developments seen with the frequent use of this method in the field of computer sciences. Two different versions of algorithm which operate recursively on CPU and at the same time which use GPU computing optimization are used in this study. Besides, OpenGL is used for graphics drawing process. Within the setting of the study, results are obtained via CPU and GPU's, at first using Quad-Tree method and then Cropped Quad-Tree method. It is observed that GPU computing is obviously faster than CPU computing and Cropped Quad-Tree method produces rapid results compared to Quad-Tree method as a result of performance. GPU computing method boosted approximately performance by up to 20 times compared to only CPU usage; furthermore, cropped quad-tree method boosted approximately performance of algorithm by up to 25 times on average dependent on screen and object size.
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    Düşük maliyetli 8-bitlik bir mikrodenetleyici kullanarak 3-fazlı indüksiyon motor hız denetleyicisinin tasarımı ve gerçekleştirilmesi
    (2009) Bay, Ömer Faruk; Görgünoglu, Salih
    AA indüksiyon motorları endüstriyel uygulamalarda yaygın olarak kullanılmaktadır. Bu motorlar genellikle değişken hızlarda çalıştırılmaktadırlar. AA motorların hızlarının kontrolu DA motorlarla kıyaslandığında, hızlarının ayarlanması daha karmaşıktır. Bu çalışmada, 3 fazlı bir indüksiyon motor hız kontrol devresi 8 bitlik bir mikrodenetleyici kullanılarak tasarlanmakta ve gerçekleştirilmektedir. Bir bakış tablosu kullanılarak, mikrodenetleyici tarafından üretilen PWM sinyalleri ile altı anahtarlı inverter kontrol edilmekte ve inverter çıkışındaki gerilimin etkin değeri ve frekansı değiştirilerek hız ayarı yapılmaktadır. Tasarlanan sistem, 8 bitlik bir mikrodenetleyici ile geliştirildiğinden, düşük maliyetli ve uygulanması kolay bir sistemdir.
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    Motion clustering on video sequences using a competitive learning network
    (2014) Görgünoglu, Salih; Açar, Şafak Altay
    It is necessary to track human movements in crowded places and environments such as stations, subways, metros, and schoolyards, where security is of great importance. As a result, undesired injuries, accidents, and unusual movements can be determined and various precautionary measures can be taken against them. In this study, real-time or existing video sequences are used within the system. These video sequences are obtained from objects such as humans or vehicles, moving actively in various environments. At first, some preprocesses are made respectively, such as converting gray scale, finding the edges of the objects existing in the images, and thresholding the images. Next, motion vectors are generated by utilizing a full search algorithm. Afterwards, k-means, nearest neighbor, image subdivision, and a competitive learning network are used as clustering methods to determine dense active regions on the video sequence using these motion vectors, and then their performances are compared. It is seen that the competitive learning network significantly determines the classification of dense active regions, including motion. Moreover, the algorithms are analyzed in terms of their time performances