Endüstri Mühendisliği Bölümü Yayın Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/279

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Start date: 2000End date: 2009

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  • Article
    Citation - Scopus: 12
    On Periodic Solutions of Linear Impulsive Delay Differential Systems
    (2008) Alzabut, Jehad; Akhmet, M.U.; Alzabut, J.O.; Zafer, A.; Matematik
    A necessary and sufficient condition is established for the existence of periodic solutions of linear impulsive delay differential systems. Copyright © 2008 Watam Press.
  • Article
    Citation - WoS: 18
    Citation - Scopus: 34
    Comparison of Globoid and Cylindrical Shearer Drums' Loading Performance
    (South African inst Mining Metallurgy, 2006) Eyyuboğlu, E.Mustafa; Ayhan, M; Eyyuboglu, EM; Endüstri Mühendisliği
    Drums of a modern longwall shearer are manufactured to include various constructional features conveying extracted material onto the face conveyor as efficiently as possible. Designing a drum with a conical shell or with reduced vane length, consequently with a stepper vane angle, is the most widely employed method in an attempt to increase loading efficiency. This study compares loading performances of two such drums, one having a conical shell with modified loading vanes, the other with a cylindrical shell with reduced vane length, Firstly, the loading performances of drums are predicted and the maximum haulage rate attainable with the drums are calculated. Then the performances of drum are compared by long-term comprehensive underground trials with coal shearers under similar conditions during the production operation of Park Termik Cayirhan coalmine in Turkey. Although higher loading performance is predicted for cylindrical drums, the in situ trials point out that Globoid drums have a slightly higher loading performance than cylindrical drums. Furthermore, the relationship between operational variables, i.e. extraction height, sumping depth, haulage rate and in situ loading performance, were investigated statistically on the basis of data gathered during the underground trials.
  • Conference Object
    Differential Algebraic Equations in Primal Dual Interior Point Optimization Methods
    (Amer inst Physics, 2004) Kasap, S; Kasap, Suat; Trafalis, TB; Endüstri Mühendisliği
    Primal dual Interior Point Methods (IPMs) generate points that lie in the neighborhood of the central trajectory. The key ingredient of the primal dual IPMs is the parameterization of the central trajectory. A new approach to the parameterization of the central trajectory is presented. Instead of parameterizing the central trajectory by the barrier parameter, it is parameterized by the time by describing a continuous dynamical system. Specifically, a new update rule based on the solution of an ordinary differential equation for the barrier parameter of the primal dual IPMs is presented. The resulting ordinary differential equation combined with the first order Karush-Kuhn-Tucker (KKT) conditions, which are algebraic equations, are called differential algebraic equations (DAEs). By solving DAEs, we find an optimal solution to the given problem.
  • Article
    Citation - Scopus: 1
    Enhanced Nutrients Removal in Conventional Anaerobic Digestion Processes
    (2009) Othman, M.Z.; Uludag-Demirer, S.; Demirer, G.N.
    One of the main challenges for one phase anaerobic digestion processes is the high concentration of NH 4 + and PO 4 3- ions in the digested sludge supernatant. This project focuses on enhancing the removal of nutrients during the anaerobic digestion process through fixing both NH 4 + and PO 4 3- ions in the form of struvite (magnesium ammonium phosphate, MAP, MgNH 4PO 4.6H 2O) within the anaerobic sludge. Batch anaerobic digestion tests showed that Mg 2+ concentration in the range 279 - 812 mg/L had insignificant effect on CGP but incurred a slight increase in COD removal. The reactor that had soluble Mg 2+:NH 4 +:PO 4 3- at a molar ratio of 1.28:1:00:1:00 achieved the best performance enhancement of 8% increase in COD removal and 32% reduction in NH 4 + in the reactor supernatant. Overall, the results show that there is a potential to optimise conventional anaerobic digestion such that supernatant lean in P and N, and sludge rich in nutrients are obtained.
  • Article
    The equivalence of discrete convexity and the classical definition of convexity
    (2006) Yüceer, Ümit
    This article presents a proof of the fact that the classical definition of convexity of nondecreasing (increasing) first forward differences for discrete univariate functions is actually a special case of the concept of discrete convexity for functions defined on a discrete space. Consequently proving the discrete convexity of separable functions is simplified and becomes simply showing each univariate function is convex in the classical sense. An illustrative example is provided.
  • Book
  • Article
    Marjinal Analiz Yoluyla Güvenilirlik Optimizasyonu
    (2005) Yüceer, Ümit
    Marjinal analizin güvenilirlik redandansı optimizasyonuna bir uyarlaması anlatılmaktadır. Amaç fonksiyonu ayrışık hale dönüştürülüp, konkav olduğu gösterilecek ve marjinal analiz metodunun çok seri ve hızlı bir şekilde, optimal olmasa bile, optimala çok yakın çözümler ürettiği bir örnekle gösterilecektir.
  • Conference Object
    TKİ-OAL çayırhan yeraltı işletmesinde hazırlık çalışmalarının değerlendirilmesi
    (2004) Eyyuboğlu, E. Mustafa; Bölükbaşı, Naci
    Orta Anadolu Linyitleri (OAL) ülkemizde tam mekanizasyonun uygulandığı ilk yeraltı işletmesidir. 1977 yılında ilk olarak Galeri Açma Makinaları'nm (GAM) kullanımı ile başlayan mekanizasyon çalışmaları 1985-1986 yıllarında yeraltı ocağında makinaların montajı ile devam etmiş ve 1987 yılında mekanize üretim başlamıştır. OAL'nin işletmecilik hakları 2000 yılından itibaren Park Termik A.Ş'ye devredilmiş olup kömür üretimi bu şirket tarafından yürütülmektedir. Bu çalışmada OAL'nin mekanize üretim için hazırlık çalışmalarını başlattığı 1977 yılından, işletme haklarını devrettiği 2000 yılına kadarki sürede yaptığı galeri açma çalışmalarının kapsamlı bir değerlendirilmesi sunulmuştur. Sonuçlar, işletmede özellikle son yıllarda yeterli performansa ulaşılamadığını göstermektedir.
  • Conference Object
    Sector Selection for Cluster Formation at OSTİM Industrial Zone: An AHP Application
    (2009) Çetinkaya, Ferda Can; Kandiller, Levent; Satır, Benhür; Umutlu, Mehmet
  • Conference Object