Baris Tan | Koç University (original) (raw)
Papers by Baris Tan
Annals of Operations Research, 2011
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International Journal of Production Economics, 2009
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Annals of Operations Research, 2000
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OR Spectrum, 2005
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Annals of Operations Research, 2011
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In this study, we investigate the strategy of increasing the production capacity temporarily by m... more In this study, we investigate the strategy of increasing the production capacity temporarily by means of contingent contractual agreements. These agreements are viewed as capacity options. A continuous material flow production system that supplies materials to meet a random demand that switches randomly between a high level and a low level is considered. The production system does not have enough capacity to meet the demand by production when the demand is high. Therefore, it either produces to stock in advance or uses a subcontractor. The contractual agreement with the subcontractor gives the right to receive additional production capacity when needed. The problem of determining the policies for production and subcontracting is formulated as an optimal control problem and analyzed analytically.
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This paper assesses the competitiveness of the Turkish Textile and Apparel Industry from the pers... more This paper assesses the competitiveness of the Turkish Textile and Apparel Industry from the perspective of public and company policies that affect global sourcing decisions. It is argued that the geographic position of Turkey and quick response capabilities of the producers create a competitive advantage for Turkey against low labour-cost producers in China and other countries. Moreover, it is also possible to compete with basic goods if the producers take a place in the European textile-apparel-retail channel of replenishment products. However, the public policies that affect international trade are also very important and affect the competitiveness of the companies. The paper also gives descriptive statistics on the structure of the Turkish textile and apparel industry.
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EFMD Insights into Business Education: case studies from business schools world, 2013
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Math Comput Modelling, 1997
We seek efficient techniques to evaluate the performance of multistation production systems with ... more We seek efficient techniques to evaluate the performance of multistation production systems with limited interstation buffers and station breakdown. Our ultimate objective is to develop a practical computer implementation that can be used for analysis and design. Practically implies two design considerations: flexibility and computational efficiency. The approach must be flexible enough to be applicable to production systems with various topologies and station characteristics. These include series arrangements of production systems, as well as network topologies and rework (feedback) systems. Similarly, the technique must be computationally expedient. Our approach is based on a framework to model single-buffer subsystems to be used within a decomposition technique to evaluate the performance of the entire system. The first part presents a quasi-birth-death process model for the subsystems. Exploiting the spectral characteristics of the associated matrix polynomial, we develop a novel solution procedure for the steady-state probabilities where the computational effort is independent of the buffer size. The solution procedure is applicable to quasi birth-death processes. The efficient solution procedure developed in this part is used as a building block in decomposing and analyzing multistation production systems with various topologies in the second part of the study.
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Iie Transactions, 2015
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Annals or, 2004
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Or Spektrum, 2005
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Annals of Operations Research, Aug 27, 2009
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This paper characterizes the business cycle as a recurring Markov chain for a broad set of develo... more This paper characterizes the business cycle as a recurring Markov chain for a broad set of developed and developing countries. The objective is to understand differences in cyclical phenomena across a broad range of countries based on the behavior of two key economic times series – industrial production and employment. The Markov chain approach is a parsimonious approach that allows
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IIE Transactions, 2014
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International Series in Operations Research & Management Science, 2013
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International Series in Operations Research & Management Science, 2003
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Business Schools and Their Contribution to Society, 2011
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We consider production systems that can be modeled as Markov chains. A methodology to determine t... more We consider production systems that can be modeled as Markov chains. A methodology to determine the exact distribution of the number of parts produced by a production system during a fixed time interval and also the exact distribution of the time to produce a given number of parts is presented. These distributions can beused to set due-dates according to the desired service level, to evaluate the due-time performance of production systems, and to derive other performance measures related to the variability of the output.
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Annals of Operations Research, 2011
Bookmarks Related papers MentionsView impact
International Journal of Production Economics, 2009
Bookmarks Related papers MentionsView impact
Annals of Operations Research, 2000
Bookmarks Related papers MentionsView impact
OR Spectrum, 2005
Bookmarks Related papers MentionsView impact
Annals of Operations Research, 2011
Bookmarks Related papers MentionsView impact
In this study, we investigate the strategy of increasing the production capacity temporarily by m... more In this study, we investigate the strategy of increasing the production capacity temporarily by means of contingent contractual agreements. These agreements are viewed as capacity options. A continuous material flow production system that supplies materials to meet a random demand that switches randomly between a high level and a low level is considered. The production system does not have enough capacity to meet the demand by production when the demand is high. Therefore, it either produces to stock in advance or uses a subcontractor. The contractual agreement with the subcontractor gives the right to receive additional production capacity when needed. The problem of determining the policies for production and subcontracting is formulated as an optimal control problem and analyzed analytically.
Bookmarks Related papers MentionsView impact
This paper assesses the competitiveness of the Turkish Textile and Apparel Industry from the pers... more This paper assesses the competitiveness of the Turkish Textile and Apparel Industry from the perspective of public and company policies that affect global sourcing decisions. It is argued that the geographic position of Turkey and quick response capabilities of the producers create a competitive advantage for Turkey against low labour-cost producers in China and other countries. Moreover, it is also possible to compete with basic goods if the producers take a place in the European textile-apparel-retail channel of replenishment products. However, the public policies that affect international trade are also very important and affect the competitiveness of the companies. The paper also gives descriptive statistics on the structure of the Turkish textile and apparel industry.
Bookmarks Related papers MentionsView impact
EFMD Insights into Business Education: case studies from business schools world, 2013
Bookmarks Related papers MentionsView impact
Math Comput Modelling, 1997
We seek efficient techniques to evaluate the performance of multistation production systems with ... more We seek efficient techniques to evaluate the performance of multistation production systems with limited interstation buffers and station breakdown. Our ultimate objective is to develop a practical computer implementation that can be used for analysis and design. Practically implies two design considerations: flexibility and computational efficiency. The approach must be flexible enough to be applicable to production systems with various topologies and station characteristics. These include series arrangements of production systems, as well as network topologies and rework (feedback) systems. Similarly, the technique must be computationally expedient. Our approach is based on a framework to model single-buffer subsystems to be used within a decomposition technique to evaluate the performance of the entire system. The first part presents a quasi-birth-death process model for the subsystems. Exploiting the spectral characteristics of the associated matrix polynomial, we develop a novel solution procedure for the steady-state probabilities where the computational effort is independent of the buffer size. The solution procedure is applicable to quasi birth-death processes. The efficient solution procedure developed in this part is used as a building block in decomposing and analyzing multistation production systems with various topologies in the second part of the study.
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Iie Transactions, 2015
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Annals or, 2004
Bookmarks Related papers MentionsView impact
Or Spektrum, 2005
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Annals of Operations Research, Aug 27, 2009
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
This paper characterizes the business cycle as a recurring Markov chain for a broad set of develo... more This paper characterizes the business cycle as a recurring Markov chain for a broad set of developed and developing countries. The objective is to understand differences in cyclical phenomena across a broad range of countries based on the behavior of two key economic times series – industrial production and employment. The Markov chain approach is a parsimonious approach that allows
Bookmarks Related papers MentionsView impact
IIE Transactions, 2014
Bookmarks Related papers MentionsView impact
International Series in Operations Research & Management Science, 2013
Bookmarks Related papers MentionsView impact
International Series in Operations Research & Management Science, 2003
Bookmarks Related papers MentionsView impact
Business Schools and Their Contribution to Society, 2011
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We consider production systems that can be modeled as Markov chains. A methodology to determine t... more We consider production systems that can be modeled as Markov chains. A methodology to determine the exact distribution of the number of parts produced by a production system during a fixed time interval and also the exact distribution of the time to produce a given number of parts is presented. These distributions can beused to set due-dates according to the desired service level, to evaluate the due-time performance of production systems, and to derive other performance measures related to the variability of the output.
Bookmarks Related papers MentionsView impact