Browsing by Author "Altintas A."

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    A Turkish Gynecologic Oncology Group study of fertility-sparing treatment for early-stage endometrial cancer
    (John Wiley and Sons Ltd, 2012) Dursun P.; Erkanli S.; Güzel A.B.; Gultekin M.; Tarhan N.C.; Altundag O.; Demirkiran F.; Beşe T.; Yildirim Y.; Bozdag G.; Yarali H.; Simsek T.; Ozcelik B.; Ortaç F.; Taskin S.; Guvenal T.; Ozgul N.; Haberal A.; Vardar M.A.; Dede M.; Yenen M.; Altintas A.; Arvas M.; Ayhan A.
    Objective: To analyze the results of fertility-sparing treatment of early-stage endometrial cancer (EC) in patients treated at Turkish gynecologic oncology centers, and to present a review of the literature. Methods: Thirteen healthcare centers in Turkey were contacted to determine if they were eligible to participate in the study. Centers that were eligible and agreed to participate were sent a database form to record the demographic characteristics, clinicopathologic findings, and follow-up results for their EC patients. Results: Eleven Turkish healthcare centers provided data on 43 EC patients. Mean duration of treatment was 5 months and mean follow-up was 49 months. In total, 35 (81.4%) patients were tumor free following primary progesterone therapy. Mean time from the end of progesterone therapy to pregnancy was 10.6 ± 4.3 months (range, 3-18 months). Two patients had tumor recurrence during follow-up. The pregnancy rate among the 31 women who actively sought pregnancy was 41.9% (n = 13). Conclusion: Conservative management of early-stage EC in women of reproductive age using oral progestins was effective and did not compromise oncological outcome. Pregnancy in the study patients was achieved spontaneously and artificially. © 2012 International Federation of Gynecology and Obstetrics.
  • No Thumbnail Available
    Item
    Analysis of thin dielectric cylindrical reflector having an arbitrary conic section profile illuminated by complex line source: H-polarization case
    (IEEE Computer Society, 2014) Oguzer T.; Kuyucuoglu F.; Avgin I.; Altintas A.
    Arbitrary conic section profile and thin dielectric reflector is analyzed by using the Method of Analytical Regularization (MAR) technique based on Riemann-Hilbert problem and Fourier inversion procedures. The reflector surface is assumed to be illuminated by an H-polarized complex line source type feed antenna. The convergence of the solution is verified and some changes in the radiation patterns are obtained especially for rather thicker cases. © 2014 IEEE.
  • No Thumbnail Available
    Item
    Analysis of a thin, penetrable, and nonuniformly loaded cylindrical reflector illuminated by a complex line source
    (Institution of Engineering and Technology, 2017) Oğuzer T.; Kuyucuoglu F.; Avgin I.; Altintas A.
    A thin, penetrable, and cylindrical reflector is illuminated by the incident field of a complex source point. The scattered field inside the reflector is not considered and its effect is modelled through a thin layer generalised boundary condition (GBC). The authors formulate the structure as an electromagnetic boundary value problem and two resultant coupled singular integral equation system of equations are solved by using regularisation techniques. The GBC provides us to simulate the thin layer better than the resistive model which is applicable only for very thin sheets. Hence, the more reliable data can be obtained for high-contrast and low-loss dielectric material. The scattering and absorption characteristics of the front-fed and offset reflectors are obtained depending on system parameters. Also, the effects of the edge loading are examined for both E- and Hpolarisations. The convergence and the accuracy of the formulation are verified in reasonable computational running time. © The Institution of Engineering and Technology 2017.