Operating room planning and scheduling: A literature review

Driven by new laws and regulations concerning the emission of greenhouse gases, carriers are starting to use electric vehicles for last-mile deliveries. The limited battery capacities of these vehicles necessitate visits to recharging stations during delivery tours of industry-typical length, which have to be considered in the route planning to avoid inefficient vehicle routes with long detours. We introduce the electric vehicle-routing problem with time windows and recharging stations E-VRPTW, which incorporates the possibility of recharging at any of the available stations using an appropriate recharging scheme. Furthermore, we consider limited vehicle freight capacities as well as customer time windows, which are the most important constraints in real-world logistics applications. As a solution method, we present a hybrid heuristic that combines a variable neighborhood search algorithm with a tabu search heuristic. Tests performed on newly designed instances for the E-VRPTW as well as on benchmark instances of related problems demonstrate the high performance of the heuristic proposed as well as the positive effect of the hybridization.

The Electric Vehicle-Routing Problem with Time Windows and Recharging Stations

The Electric Vehicle Routing Problem with Time Windows and Recharging Stations

A survey of healthcare facility location

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Operations research: applications and algorithms / Wayne L. Winston

Recticel Bedding Hulshout is a mattress manufacturer. The company intends to build a new packing line as a final step in their production lay-out redesign project. The objective of this study consists in answering the question whether, given the production volumes, the mix of mattresses (without packing, once wrapped or double wrapped) is operationally feasible within different scenarios. The new lay-out of the packing line can be modelled as a typical multi product job shop with general arrivals and general processing. The products (units of different modes of mattresses, a mode being a typical packing form of a mattress) enter the system individually and are processed as such at all manipulation steps. The mode depends on the upstream production line and is characterised by a deterministic routing. A general open queueing network and a parallel simulation model have been developed. We are able to show that the new lay-out is feasible, taking into account the different scenarios. Methodologically, we reveal that both an approximated queueing network and simulation are suitable approaches to give an answer to the managerial questions. However, the queueing model has the advantage of being a much more flexible, in terms of conducting 'what-if' scenarios and computational efficient approach. 

A queueing based analysis of a packing line

The assembly of components is a key element in manufacturing facilities. Nevertheless, literature analysing them remains scarce. The paper narrows this gap by studying a generic first-come first-serve assembly system, consisting of two generally-distributed component input streams. The field of probability theory serves as a means to derive good approximations for the waiting time of the components for a kit and the inter-arrival time of the kits at the assembly facility. Apart from providing insight in generally accepted managerial principles, this analysis also constitutes a required step in obtaining the performance of an open queueing network including assemblies.

Analytical analysis of a generic assembly system

This chapter examines the coordination of converging material (component) flows in supply chains under conditions of uncertainty. It is well known that such flows complicate regular material flows. They entail that the components should wait for each other (synchronization time of components) and induce a modified arrival process on the part of the sets of components at the assembly operation (arrival process of kits). As such, they play a major role in supply chain performance. In order to improve this performance, one can rely on some important generic managerial insights: if component flows are independent renewal processes and warehouses have enough (infinite) capacity, the flows do not get synchronized; more variable component flows degrade system performance; more frequent component supply (keeping the level of variability fixed) does not change the synchronization time but improves productivity; more components degrade system performance and, finally, component flows need coordination. This chapter develops approximations in order to underpin these managerial insights and concludes by extending these insights to practical guidelines.

Coordination of Converging Material Flows Under Conditions of Uncertainty in Supply Chains

This paper presents and compares two different solution approaches to optimize the glass collection process at a single intermunicipal authority in Belgium. First, a model enhancement approach is proposed to solve a shift scheduling optimization problem integrating the construction of glass collection routes. Second, a simulation based rolling horizon procedure is designed to determine the possible benefits of providing the glass containers with fill level sensors. The performance of both solution approaches is evaluated and compared using real-life data.

Optimizing the workforce schedule and collection routes for glass containers

This paper presents an Integer Programming (IP) model for solving an online energy supply game. Instead of a traditional approach in which students are given a problem statement and asked to develop an IP model, both the problem and data are hidden in the game. Next to developing IP modeling skills, students also become familiar with the properties of several energy supply systems. A classroom experiment proves that the game component, together with the use of a current topic such as energy supply, motivates students more to build IP models when compared to classical approaches.

Liesje De Boeck

Papers

A queueing based analysis of a packing line

Analytical analysis of a generic assembly system

Coordination of Converging Material Flows Under Conditions of Uncertainty in Supply Chains

Optimizing the workforce schedule and collection routes for glass containers

An Integer Programming Model for an Energy Supply Game