Baris Tan | Koç University (original) (raw)

Papers by Baris Tan

Research paper thumbnail of Introduction to the special issue on Advances in Manufacturing Systems

Annals of Operations Research, 2011

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Research paper thumbnail of Analysis of a general Markovian two-stage continuous-flow production system with a finite buffer

International Journal of Production Economics, 2009

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Research paper thumbnail of Production and Subcontracting Strategies for Manufacturers with Limited Capacity and Volatile Demand

Annals of Operations Research, 2000

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Research paper thumbnail of Stochastic models for the design, coordination, and control of manufacturing systems

OR Spectrum, 2005

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Research paper thumbnail of Modelling and analysis of Markovian continuous flow systems with a finite buffer

Annals of Operations Research, 2011

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Research paper thumbnail of Options-Based Sourcing Strategies for Producers with Limited Capacity and Volatile Demand

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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Research paper thumbnail of Global Sourcing and the Competitiveness of the Turkish Textile and Apparel Industries

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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Research paper thumbnail of Towards Europe: Koç Business School

EFMD Insights into Business Education: case studies from business schools world, 2013

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Research paper thumbnail of Analysis of multistation production systems with limited buffer capacity part 1: The subsystem model

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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Research paper thumbnail of On the Exact Inter-departure and Cycle Time Distribution of Closed Queueing Networks Subject to Blocking

Iie Transactions, 2015

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Research paper thumbnail of Production and Subcontracting Strategies for Manufacturers with Limited Capacity and Volatile Demand

Annals or, 2004

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Research paper thumbnail of A multiperiod stochastic production planning and sourcing problem with service level constraints

Or Spektrum, 2005

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Research paper thumbnail of Modelling and analysis of Markovian continuous flow systems with a finite buffer

Annals of Operations Research, Aug 27, 2009

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Research paper thumbnail of Variance of the Output as a Function of Time: Production Line Dynamics

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Research paper thumbnail of Cyclical Dynamics of Industrial Production and Employment: Markov Chain-based Estimates and Tests

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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Research paper thumbnail of On the Exact Inter-departure, Inter-start, and Cycle Time Distribution of Closed Queueing Networks Subject to Blocking

IIE Transactions, 2014

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Research paper thumbnail of Modeling and Analysis of Output Variability in Discrete Material Flow Production Systems

International Series in Operations Research & Management Science, 2013

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Research paper thumbnail of State-Space Modeling and Analysis of Pull-Controlled Production Systems

International Series in Operations Research & Management Science, 2003

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Research paper thumbnail of The Legitimacy and Future of Business Schools in Turkey

Business Schools and Their Contribution to Society, 2011

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Research paper thumbnail of Analysis of the Variability of the Output from Production Systems

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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Research paper thumbnail of Introduction to the special issue on Advances in Manufacturing Systems

Annals of Operations Research, 2011

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Research paper thumbnail of Analysis of a general Markovian two-stage continuous-flow production system with a finite buffer

International Journal of Production Economics, 2009

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Research paper thumbnail of Production and Subcontracting Strategies for Manufacturers with Limited Capacity and Volatile Demand

Annals of Operations Research, 2000

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Research paper thumbnail of Stochastic models for the design, coordination, and control of manufacturing systems

OR Spectrum, 2005

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Research paper thumbnail of Modelling and analysis of Markovian continuous flow systems with a finite buffer

Annals of Operations Research, 2011

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Options-Based Sourcing Strategies for Producers with Limited Capacity and Volatile Demand

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

Research paper thumbnail of Global Sourcing and the Competitiveness of the Turkish Textile and Apparel Industries

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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Research paper thumbnail of Towards Europe: Koç Business School

EFMD Insights into Business Education: case studies from business schools world, 2013

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Research paper thumbnail of Analysis of multistation production systems with limited buffer capacity part 1: The subsystem model

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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Research paper thumbnail of On the Exact Inter-departure and Cycle Time Distribution of Closed Queueing Networks Subject to Blocking

Iie Transactions, 2015

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Research paper thumbnail of Production and Subcontracting Strategies for Manufacturers with Limited Capacity and Volatile Demand

Annals or, 2004

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Research paper thumbnail of A multiperiod stochastic production planning and sourcing problem with service level constraints

Or Spektrum, 2005

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Research paper thumbnail of Modelling and analysis of Markovian continuous flow systems with a finite buffer

Annals of Operations Research, Aug 27, 2009

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Research paper thumbnail of Variance of the Output as a Function of Time: Production Line Dynamics

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Cyclical Dynamics of Industrial Production and Employment: Markov Chain-based Estimates and Tests

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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Research paper thumbnail of On the Exact Inter-departure, Inter-start, and Cycle Time Distribution of Closed Queueing Networks Subject to Blocking

IIE Transactions, 2014

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Research paper thumbnail of Modeling and Analysis of Output Variability in Discrete Material Flow Production Systems

International Series in Operations Research & Management Science, 2013

Bookmarks Related papers MentionsView impact

Research paper thumbnail of State-Space Modeling and Analysis of Pull-Controlled Production Systems

International Series in Operations Research & Management Science, 2003

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Legitimacy and Future of Business Schools in Turkey

Business Schools and Their Contribution to Society, 2011

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Analysis of the Variability of the Output from Production Systems

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