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  • Küçük Resim
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    Ahp Model For Transition From IPv4 TO IPv6
    (Gazi Univ, Fac Engineering Architecture, 2011) Aydogan, Emel Kizilkaya; Soylu, M. Yekta; Gencer, Cevriye; Cetin, Suna; Soysal, Murat; Bektas, Onur; Sagiroglu, Seref
    In this study, one of multi criterion decision making methods, Analytic Hierarchy Process (AHP), was used to decide the best transition mechanism from IPv4 to IPv6 based on "National IPv6 Protocol Infrastructure Design and Transition" Project. The contributions of this study are summarized as being the first study in the field, establishing the parameters for this transition, defining criteria sets to this field for the first time and applying AHP to this problem. In addition to those, questionnaires were prepared and applied to define the best transition strategies. The results were then obtained from Super Decisions 1.6.0 software package for achieving suitable transition mechanisms. It is expected that this study will help and contribute to the state organizations to decide suitable transition mechanisms to IPv6, to use the country resources more effective, to shorten the transition time and finally to present systematic and scientific approach to this transition.
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    Öğe
    Influence of some knitting and finishing parameters on the snag resistance of polyethylene terephthalate (PET) knit fabric
    (Sage Publications Ltd, 2022) Yibar, Mehmet Fahri; Ogut, Hamdi; Cingu, Neslihan; Cetin, Suna; Yatikci, Tugce Koroglu; Yildirim, Kenan
    To assess the effects of fabric take-up, yarn tension, feeder position, and yarn feeder material on the occurrence of snagging, fabrics produced with two different finishing processes, were subjected to longitudinal or transversal 100, 300, and 600 revolutions, and the degree of snagging was measured and compared afterwards with gray fabric. Our results showed that, during the knitting process, the use of ceramic yarn feeders resulted in significantly fewer snags compared with metal yarn feeders. The gray fabric, having no finishing, was fragile and easily snagged, whereas the fabric treated by a finishing process - either drying in relaxed condition (Treatment A) or under stress conditions (Treatment B) - was more resistant to snagging. Moreover, the snagging property of the gray fabric tended to increase with increasing longitudinal or transversal 100, 300, or 600 revolutions. Slight increases in snagging were also present in fabrics having Treatment A or Treatment B at the same revolutions, but the differences were not statistically important (P > 0.05). Frequency of snags was higher when revolutions were transversal rather than on longitudinal direction. Yarn tension and feeder position had no effect on snagging degree, while fabric take-up had limited effect. For acquiring a fabric resistant to snagging, the gray fabric produced with ceramic yarn guiders during the knitting process should be subjected to drying under relaxed condition. We also suggest that quality control tests be carried out taking the results of our study into consideration.
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    Öğe
    İş Sağlığı ve Güvenliği’nde Sürdürülebilir Kişisel Koruyucu Donanım Politikalarının Uygulanması
    (2021) Cetin, Suna; Beğik, Vesile
    İş kazaları ve meslek hastalıklarına ilişkin istatistiki veriler, iş sağlığı ve güvenliği (İSG) koşulları hakkında bilgi veren kaynaklardır. Türkiye’de yapılan çalışmalar, iş kazaları oranının son yıllarda azaldığını ancak bu azalmanın henüz yeterli düzeyde olmadığını göstermektedir. Hem meslek hastalıklarının hem iş kazalarının firmalara getirdiği mali yük düşünüldüğünde, önleyici ve koruyucu faaliyetlerin önemi bir kez daha ortaya çıkmaktadır. İSG çalışmaları kaynakta koruma, ortama yönelik koruma ve kişisel koruyucu donanımlar olarak 3 aşamada ele alınmaktadır. İş yerinde tanımlanan tüm İSG yaklaşımlarının uygulanabilir ve sürdürülebilir faaliyetler olması, bilançonun ağır olup olmamasında büyük önem arz etmektedir. Bu çalışmada İSG yaklaşımlarından biri olan kişisel koruyucu donanımların (KKD) uygulamadaki sürdürülebilirliği araştırılmıştır. Ankara’da faaliyet gösteren ısı cihazları üreten bir firmada kullanılması gereken kişisel koruyucu donanımların neler olduğu, bunların kullanımı ile ilgili alınan eğitimlerin düzeyi ve kullanım oranını etkinliği ile ilgili incelemeler yapılmıştır. Kullanım oranlarının yüksek olarak hesaplanmıştır. Kullanım oranlarının yüksek olması verilen İSG kapsamında verilen eğitimlerinin yeterli olduğunu, çalışanların KKD kullanımı konusunda bilinçli olduğunu, İSG konusunda farkındalığa sahip olduklarını göstermiştir.
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    Öğe
    The Position Of Turkish Air Transportation In Europe
    (Stef92 Technology Ltd, 2016) Camurdan, Burak; Cetin, Suna; Gurgen, Selim; Kushan, Melih Cemal
    Turkish civil aviation has been rapidly grown in recent years. Particularly, today Turkish Airlines is one of Europe's largest airlines. This rapid growth realizes with the competition among the companies both in Turkey and the world. Due to this growth, Turkish air transportation connects many places to each other in the world. In this study, Turkish air transportation was discussed in terms of quantity and quality.
  • Küçük Resim
    Öğe
    Vehicle routing problems with hard time windows and simultaneous pick up and delivery: a mathematical model
    (Gazi Univ, Fac Engineering Architecture, 2010) Cetin, Suna; Gencer, Cevriye
    In this study, vehicle routing problems with hard time windows and simultaneous pick up and delivery are determined and mathematical model is developed. Generally the goal of vehicle routing problems is minimization of travelling distance or travelling cost. In the literature it is observed that vehicle routing problems with time windows have also the same goals with vehicle routing problems. However, waiting time resulted from time windows must be considered for vehicle routing problems with time windows. In this study, objective function of the mathematical model of the determined problem is chosen as waiting time minimization. Solomon Benchmark Problems are revised to adapt for the problem structure and results are obtained by using GAMS.