Yazar "Birgoren, Burak" için listeleme
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Brass alloy blending problem from quality and cost perspectives: A multi-objective optimization approach
Birgoren, Burak; Sakalli, Umit Sami (GAZI UNIV, FAC ENGINEERING ARCHITECTURE, 2021)Brass alloy is a composition of copper and zinc and it also includes lead, iron, tin, aluminum, nickel, antimony if necessary. One of the basic problems in brass casting is to determine which pure and scrap materials will ... -
Confidence interval estimation of Weibull lower percentiles in small samples via Bayesian inference
Yalcinkaya, Meryem; Birgoren, Burak (Elsevier Sci Ltd, 2017)Weibull distribution has been vastly used for modeling fracture strength of ceramic and composite materials. Confidence interval estimation of Weibull parameters and percentiles in small samples has been an important concern ... -
Design optimization of cutting parameters when turning hardened AISI 4140 steel (63 HRC) with Al2O3+TiCN mixed ceramic tool
Aslan, Ersan; Camuscu, Necip; Birgoren, Burak (Elsevier Sci Ltd, 2007)Due to their high hardness and wear resistance, Al2O3-based ceramics are one of the most suitable cutting tool materials for machining hardened steels. However, their high degree of brittleness usually leads to inconsistent ... -
Estimating confidence lower bounds of Weibull lower percentiles with small samples in material reliability analysis
Yalcinkaya, Meryem; Birgoren, Burak (Pamukkale Univ, 2020)Weibull distribution is widely used in the modeling of mechanical properties such as tensile strength of ceramic and composite materials. The 95% one-sided confidence lower bounds on the 1st and 10th Weibull percentiles, ... -
Estimation algorithms for Weibull parameters and percentiles
Danaci, Mehmet Akif; Birgoren, Burak; Ersoz, Suleyman (Gazi Univ, Fac Engineering Architecture, 2009)This study concerns the use of Weibull distribution in statistical component reliability. Recently, estimation of confidence intervals and confidence lower bounds for Weibull parameters and percentiles in small samples has ... -
Joint optimization of quality and cost in brass casting using stochastic programming
Sakalli, Umit Sami; Birgoren, Burak (Taylor & Francis Ltd, 2019)A critical process in brass casting is the blending of pure and scrap materials to satisfy specified metal ratios. The primary focus in such blending problems has always been cost minimization. The optimal blends produced ... -
Modeling and analyzing customer data in customer relationship management with artificial neural networks
Ersöz, Süleyman; Yaman, Nevra; Birgoren, Burak (Gazi Univ, Fac Engineering Architecture, 2008)Customers must keep customer satisfaction as a top priority in order to keep up with increasing competition. In order to achieve, they need to be able to analyze their customers properly and pay attention to their individual ... -
A possibilistic aggregate production planning model for brass casting industry
Sakalli, Umit Sami; Baykoc, Omer Faruk; Birgoren, Burak (Taylor & Francis Ltd, 2010)This article discusses a possibilistic aggregate production planning (APP) model for blending problem in a brass factory; the problem computing optimal amounts of raw materials for the total production of several types of ... -
A spreadsheet-based decision support tool for blending problems in brass casting industry
Sakalli, Umit Sami; Birgoren, Burak (Pergamon-Elsevier Science Ltd, 2009)This paper has discussed development and implementation of spreadsheet-based decision support tools for modeling and solving blending problems in a large-scale brass factory in Turkey. The user interfaces have been designed ... -
A statistical design optimization study of a multi-chamber reactive type silencer using simplex centroid mixture design
Secgin, Erkan; Arslan, Hakan; Birgoren, Burak (Sage Publications Ltd, 2021)This study aims to optimize the acoustic performance of a silencer with baffles having extension tubes. It considers the position, the number and the extension geometry of the baffles as design variables and sound transmission ... -
Stochastic optimization for blending problem in brass casting industry
Sakalli, Umit Sami; Baykoc, Omer Faruk; Birgoren, Burak (Springer, 2011)A critical process in brass casting is blending of the raw materials in a furnace so that the specified metal ratios are satisfied. The uncertainties in raw material compositions may cause violations of the specification ...