Yazar "Gürsoy M.H." seçeneğine göre listele

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    Actions of vector groupoids
    (Iranian Mathematical Society, 2014) Gürsoy M.H.
    In this work we deal with actions of vector groupoid which is a new concept in the literature. After we give the definition of the action of a vector groupoid on a vector space, we obtain some results related to actions of vector groupoids. We also apply some characterizations of the category and groupoid theory to vector groupoids. As the second part of the work, we define the notion of a crossed module over a vector groupoid. Finally, we show that the category VG of the vector groupoids is equivalent to the category CModVG of the crossed modules over a vector groupoid. © 2014 Iranian Mathematical Society.
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    The homomorphisms of topological groupoids
    (Institute of Mathematics, 2014) Gürsoy M.H.; İcen İ.
    The main purpose of this paper is to study topological groupoid homomorphisms and to give some kinds of special topological groupoid homomorphisms. Finally, some characterizations of these homomorphisms are given. © 2014, Institute of Mathematics. All rights reserved.
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    Injuries of large vessels in high stage neuroblastoma surgery. A case report
    (1999) Koltuksuz U.; Gürsoy M.H.; Aydinç M.; Özgen Ü.; Ege E.; Mutus M.
    Complete resection of the primary lesion in stage III neuroblastoma improves survival. Neuroblastoma has a tendency towards surrounding and infiltrating the large vessels, leading to injuries during tumor resection. We operated on a stage Ill neuroblastoma, which resulted in the right and left common iliac artery and vein damage. The right common iliac artery and, veins were repaired by end to end anastomosis. There was a long gap between the two ends of the left common iliac artery and it was repaired using a mesenteric vein (marginal vein of the colon) graft. Digital subtraction angiography performed 6 months after the operation did not reveal any stenosis or aneurysmatic changes in the anastomoses. We conclude that short segments of large vessels may be sacrificed during the resection of neuroblastomas invading the vessel wall, and the resulting defects may be repaired by end to end anastomosis, or even by substituting mesenteric vein grafts, for the purpose of total or near total removal.