Erhan Kozan | QUT - Academia.edu (original) (raw)

Papers by Erhan Kozan

Research paper thumbnail of Australian public hospital surgical case study

This data set includes information regarding a case study of a large Australian public hospital. ... more This data set includes information regarding a case study of a large Australian public hospital. This includes the size of the surgical department, details on surgical duration (assuming surgical duration is lognormally distributed), an initial waiting list, surgeon availability, and the average number of patients arriving per week.

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Research paper thumbnail of Operations research from theory to real life : the 15th National Conference of the Australian Society for Operations Research inc. incorporating ASOR Queensland Branch and ORSJ Hokkaido Chapter Joint Workshop

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Research paper thumbnail of Mathematical modelling of container transfers and storage locations at seaport terminals

Springer eBooks, Aug 3, 2007

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Research paper thumbnail of Waiting list management through master surgical schedules: A case study

Operations research for health care, Sep 1, 2016

Abstract In this paper we address the problem of generating master surgical schedules (MSSs) that... more Abstract In this paper we address the problem of generating master surgical schedules (MSSs) that adhere to staff and equipment restrictions whilst ensuring patients are treated in a timely manner. We simultaneously address the master surgical scheduling problem (MSSP) and the surgical case assignment problem (SCAP). Stochastic surgical durations are considered in order to produce more robust schedules and reduce unexpected overtime. Also incorporated into the model are several constraints regarding patient wait targets that are set by the Australian government. The problem is formulated using a mixed integer nonlinear programming (MINLP) approach and solved using a variety of hybrid metaheuristics. The metaheuristics implemented are inspired by simulated annealing (SA) and reduced variable neighbourhood search (RVNS). In particular, we present an adaptive SA and hybridise SA and RVNS to greatly improve solution quality. The solution neighbourhoods used by the metaheuristics are based on the hierarchical structure present in the combined MSSP SCAP. We consider a case study of an Australian public hospital with a large surgical department and compare the performance of our model to historical data.

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Research paper thumbnail of Energy efficient scheduling of open-pit coal mine trucks

Science & Engineering Faculty, 2017

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Research paper thumbnail of A Blocking Parallel-Machine Job-Shop-Scheduling Model for the Train Scheduling Problem

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Research paper thumbnail of An integrated model of an open-pit coal mine: improving energy efficiency decisions

International Journal of Production Research, Nov 25, 2015

This article contributes an original integrated model of an open-pit coal mine for supporting ene... more This article contributes an original integrated model of an open-pit coal mine for supporting energy-efficient decisions. Mixed integer linear programming is used to formulate a general integrated model of the operational energy consumption of four common open-pit coal mining subsystems: excavation and haulage, stockpiles, processing plants and belt conveyors. Mines are represented as connected instances of the four subsystems, in a flow sheet manner, which are then fitted to data provided by the mine operators. Solving the integrated model ensures the subsystems’ operations are synchronised and whole-of-mine energy efficiency is encouraged. An investigation on a case study of an open-pit coal mine is conducted to validate the proposed methodology. Opportunities are presented for using the model to aid energy-efficient decision-making at various levels of a mine, and future work to improve the approach is described.

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Research paper thumbnail of The reactive multiple operating room surgical case sequencing problem

arXiv (Cornell University), Aug 30, 2018

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Research paper thumbnail of Reducing post-surgery recovery bed occupancy with a probabilistic forecast model

arXiv (Cornell University), Aug 30, 2018

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Research paper thumbnail of Profile-based application assignment for greener and more energy-efficient data centers

Future Generation Computer Systems, Feb 1, 2017

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Research paper thumbnail of The Direction of Operations Research in Australia

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Research paper thumbnail of An integrated rolling horizon approach to increase operating theatre efficiency

arXiv (Cornell University), Aug 30, 2018

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Research paper thumbnail of Adapting Ant Colony Optimization to a Real Machine Layout Problem

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Research paper thumbnail of A multi-criteria approach for hospital capacity analysis

European Journal of Operational Research, 2016

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Research paper thumbnail of Planning Seaport Container Terminals

IFAC Proceedings Volumes, 1995

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Research paper thumbnail of Modeling Single-Line Train Operations

Transportation Research Record, 1995

Scheduling of trains on a single line involves the use of train priorities for the resolution of ... more Scheduling of trains on a single line involves the use of train priorities for the resolution of conflicts. First, a mathematical programming model is described. The model schedules trains over a single line of track when the priority of each train in a conflict depends on an estimate of the remaining crossing and overtaking delay. This priority is used in a branch-and-bound procedure to allow the determination of optimal solutions quickly. This is demonstrated with the use of an example. Rail operations over a single-line track require the existence of a set of sidings at which trains can cross or overtake each other. Investment decisions on upgrading the numbers and locations of these sidings can have a significant impact on both customer service and rail profitability. Sidings located at insufficient positions may lead to high operating costs and congestion. Second, a model to determine the optimal position of a set of sidings on a single-track rail corridor is described. The sid...

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Research paper thumbnail of A new constraint programming approach for optimising a coal rail system

Optimization Letters, May 14, 2016

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Research paper thumbnail of A Constraint Programming Approach to Optimise Sugarcane Rail Operations

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Research paper thumbnail of A short-term production scheduling methodology for open-pit mines

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Research paper thumbnail of Experimental dataset for optimising the freight rail operations

Data in Brief, Dec 1, 2016

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Research paper thumbnail of Australian public hospital surgical case study

This data set includes information regarding a case study of a large Australian public hospital. ... more This data set includes information regarding a case study of a large Australian public hospital. This includes the size of the surgical department, details on surgical duration (assuming surgical duration is lognormally distributed), an initial waiting list, surgeon availability, and the average number of patients arriving per week.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Operations research from theory to real life : the 15th National Conference of the Australian Society for Operations Research inc. incorporating ASOR Queensland Branch and ORSJ Hokkaido Chapter Joint Workshop

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Mathematical modelling of container transfers and storage locations at seaport terminals

Springer eBooks, Aug 3, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Waiting list management through master surgical schedules: A case study

Operations research for health care, Sep 1, 2016

Abstract In this paper we address the problem of generating master surgical schedules (MSSs) that... more Abstract In this paper we address the problem of generating master surgical schedules (MSSs) that adhere to staff and equipment restrictions whilst ensuring patients are treated in a timely manner. We simultaneously address the master surgical scheduling problem (MSSP) and the surgical case assignment problem (SCAP). Stochastic surgical durations are considered in order to produce more robust schedules and reduce unexpected overtime. Also incorporated into the model are several constraints regarding patient wait targets that are set by the Australian government. The problem is formulated using a mixed integer nonlinear programming (MINLP) approach and solved using a variety of hybrid metaheuristics. The metaheuristics implemented are inspired by simulated annealing (SA) and reduced variable neighbourhood search (RVNS). In particular, we present an adaptive SA and hybridise SA and RVNS to greatly improve solution quality. The solution neighbourhoods used by the metaheuristics are based on the hierarchical structure present in the combined MSSP SCAP. We consider a case study of an Australian public hospital with a large surgical department and compare the performance of our model to historical data.

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Research paper thumbnail of Energy efficient scheduling of open-pit coal mine trucks

Science & Engineering Faculty, 2017

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Research paper thumbnail of A Blocking Parallel-Machine Job-Shop-Scheduling Model for the Train Scheduling Problem

Bookmarks Related papers MentionsView impact

Research paper thumbnail of An integrated model of an open-pit coal mine: improving energy efficiency decisions

International Journal of Production Research, Nov 25, 2015

This article contributes an original integrated model of an open-pit coal mine for supporting ene... more This article contributes an original integrated model of an open-pit coal mine for supporting energy-efficient decisions. Mixed integer linear programming is used to formulate a general integrated model of the operational energy consumption of four common open-pit coal mining subsystems: excavation and haulage, stockpiles, processing plants and belt conveyors. Mines are represented as connected instances of the four subsystems, in a flow sheet manner, which are then fitted to data provided by the mine operators. Solving the integrated model ensures the subsystems’ operations are synchronised and whole-of-mine energy efficiency is encouraged. An investigation on a case study of an open-pit coal mine is conducted to validate the proposed methodology. Opportunities are presented for using the model to aid energy-efficient decision-making at various levels of a mine, and future work to improve the approach is described.

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Research paper thumbnail of The reactive multiple operating room surgical case sequencing problem

arXiv (Cornell University), Aug 30, 2018

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Research paper thumbnail of Reducing post-surgery recovery bed occupancy with a probabilistic forecast model

arXiv (Cornell University), Aug 30, 2018

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Research paper thumbnail of Profile-based application assignment for greener and more energy-efficient data centers

Future Generation Computer Systems, Feb 1, 2017

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Research paper thumbnail of The Direction of Operations Research in Australia

Bookmarks Related papers MentionsView impact

Research paper thumbnail of An integrated rolling horizon approach to increase operating theatre efficiency

arXiv (Cornell University), Aug 30, 2018

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Research paper thumbnail of Adapting Ant Colony Optimization to a Real Machine Layout Problem

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A multi-criteria approach for hospital capacity analysis

European Journal of Operational Research, 2016

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Planning Seaport Container Terminals

IFAC Proceedings Volumes, 1995

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Modeling Single-Line Train Operations

Transportation Research Record, 1995

Scheduling of trains on a single line involves the use of train priorities for the resolution of ... more Scheduling of trains on a single line involves the use of train priorities for the resolution of conflicts. First, a mathematical programming model is described. The model schedules trains over a single line of track when the priority of each train in a conflict depends on an estimate of the remaining crossing and overtaking delay. This priority is used in a branch-and-bound procedure to allow the determination of optimal solutions quickly. This is demonstrated with the use of an example. Rail operations over a single-line track require the existence of a set of sidings at which trains can cross or overtake each other. Investment decisions on upgrading the numbers and locations of these sidings can have a significant impact on both customer service and rail profitability. Sidings located at insufficient positions may lead to high operating costs and congestion. Second, a model to determine the optimal position of a set of sidings on a single-track rail corridor is described. The sid...

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Research paper thumbnail of A new constraint programming approach for optimising a coal rail system

Optimization Letters, May 14, 2016

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Research paper thumbnail of A Constraint Programming Approach to Optimise Sugarcane Rail Operations

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A short-term production scheduling methodology for open-pit mines

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Experimental dataset for optimising the freight rail operations

Data in Brief, Dec 1, 2016

Bookmarks Related papers MentionsView impact