Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
An assessment of a two-echelon inventory system againstalternative systems
Download
index.pdf
Date
2011
Author
Özpamukçu, Serkan
Metadata
Show full item record
Item Usage Stats
76
views
23
downloads
Cite This
In this study, we focus on a real life problem that involves a single item which is used in military operations. The items in use fail according to a Poisson process and lead times are deterministic. Four alternative inventory control models are developed. Among these models, a two-echelon system consisting of a depot in the upper and several bases in the lower echelon is operated currently. This system is compared to a single-echelon system that consists of several bases. The comparison reveals the importance of the holding cost incurred for the items intransit between the depot and the base which is ignored in most of the studies in literature. Both the two and single-echelon models are also extended to have repair ability. A continuous-review base-stock policy is used for all models. Exact models are formulated. The results are obtained under various lead time, unit costs and demand parameters. Results of four different settings are compared and the findings are reported.
Subject Keywords
İnventory control.
URI
http://etd.lib.metu.edu.tr/upload/12613949/index.pdf
https://hdl.handle.net/11511/20818
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Detailed modeling and control of a 2-DOF gimbal system
Poyrazoğlu, Erhan; Leblebicioğlu, Mehmet Kemal; Department of Electrical and Electronics Engineering (2017)
Gimbal systems are used in various engineering applications such as military systems. Their configurations are designed according to the types of application and desired performance requirements. The essential aim of these systems is to compensate the disturbance effects in order to stabilize LOS and positioning to the desired point. In this thesis, first, a detailed mathematical model of a 2-DOF gimbal system containing some nonlinear dynamic effects such as friction, static and dynamic mass unbalance is obt...
Element-free galerkin method for plane stress problems
Akyazı, Fatma Dilay; Oral, Süha; Department of Mechanical Engineering (2010)
In this study, the Element-Free Galerkin (EFG) method has been used for the analysis of plane stress problems. A computer program has been developed by using FORTRAN language. The moving least squares (MLS) approximation has been used in generating shape functions. The results obtained by the EFG method have been compared with analytical solution and the numerical results obtained by MSC. Patran/Nastran. The comparisons show that the mesh free method gives more accurate results than the finite element appro...
Development of interior ballistic simulation software
Danış, Faik; Aksel, Mehmet Haluk; Ak, M. Ali; Department of Mechanical Engineering (2014)
In this study, an interior ballistic simulation program is constructed for solid propellant conventional guns. In accordance with this purpose, interior ballistic calculations are studied numerically and two numerical models are produced: zero dimensional model and one dimensional model. Zero dimensional model, which is based on lumped parameter approach, examines variation of ballistic parameters with ignition of propellant grains in order to find muzzle velocity. In one dimensional code, the problem is mo...
Successive target cancelation for radar waveform sidelobe reduction
Haliloğlu, Onur; Yılmaz, Ali Özgür; Department of Electrical and Electronics Engineering (2006)
Many radars suffer from masking of weaker targets by stronger ones due to range sidelobes of pulse compression codes. We propose a method to prevent this by successively detecting targets and canceling their effects. Performance of the proposed method will be investigated in various scenarios with regard to existence of noise, targets, and the Doppler effect.
An Approach for determining process economy parameters of multivariate loss functions
Özkan, Gökçe; Köksal, Gülser; Department of Industrial Engineering (2016)
The aim of this study is to provide an effective method for determining parameters of multivariate loss functions, which are related with process economics. The loss functions are widely used in product and process design and other quality engineering applications. Although there are several studies about different types of loss functions, there is a lack of studies on determining cost matrix parameters of these functions. For this purpose, we propose a method based on multi-objective decision making tools....
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
S. Özpamukçu, “An assessment of a two-echelon inventory system againstalternative systems,” M.S. - Master of Science, Middle East Technical University, 2011.
