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Packing problems and project scheduling models: An integrated perspective

Hartmann, Sönke - 1999

This paper considers two problem classes that are important to researchers as well as practitioners, namely packing and … project scheduling problems. First, the two problem categories are described. This includes a classification of packing … application, similarities of their mathematical structures are examined. It is shown that all packing problems considered here are …

Persistent link: https://www.econbiz.de/10011558750

Output maximization container loading problem with time availability constraints

Castellucci, Pedro B.; de Toledo, Franklina Maria Bragion; … - In: Operations Research Perspectives 6 (2019), pp. 1-7

Research on container loading problems has helped increase the occupation rate of containers in different practical situations. We consider these problems within a context which might pressure the loading process, leading to sub-optimal solutions. Some facilities like cross-docks have reduced...

Persistent link: https://www.econbiz.de/10012662792

Optimization guided lower and upper bounds for the resource investment problem

Drexl, Andreas; Kimms, Alf - 1998

The resource investment problem deals with the issue of providing resources to a project such that a given deadline can be met. The objective is to make the resources available in the cheapest possible way. For each resource, expenses depend on the maximum amount required during the course of...

Persistent link: https://www.econbiz.de/10011558737

Sales force deployment by mathematical programming

Haase, Knut - 1999

The sales force deployment problem is considered which arises in many selling organizations. As a solution a novel mixed-integer formulation is introduced which is specifically characterized by an infinite number of variables. A column generation approach is proposed to obtain upper and lower...

Persistent link: https://www.econbiz.de/10011558749

Retail business staff scheduling under complex labor relations

Haase, Knut - 1999

The staff scheduling problem in the retail business is considered for which a new mathematical model and new solution methods are introduced. The problem is formalized as a set covering type problem. Columns represent feasible weekly working time patterns of one sales clerk. Rows correspond to...

Persistent link: https://www.econbiz.de/10011558751

Network decomposition-based lower and upper bounds for the discrete time-cost tradeoff problem

Akkan, Can; Drexl, Andreas; Kimms, Alf - 2000

In project management, the project duration can often be compressed by accelerating some of its activities at an additional expense. This is the so-called time-cost tradeoff problem which has been extensively studied in the past. However, the discrete version of the problem which is of great...

Persistent link: https://www.econbiz.de/10011558760

Lower bounds for the capacitated facility location problem based on column generation

Klose, Andreas; Drexl, Andreas - 2001

The Capacitated Facility Location Problem (CFLP) is a well-known combinatorial optimization problem with applications in distribution and production planning. A variety of lower bounds based on Lagrangean relaxation and subgradient optimization has been proposed for this problem. However, in...

Persistent link: https://www.econbiz.de/10011558775

Duty-period-based network model for airline crew rescheduling

Nissen, Rüdiger; Haase, Knut - 2004

Airline rescheduling is a relatively new field in airline Operations Research but increasing amounts of traffic will make disturbances to the original schedule more frequent and more severe, and thus the need to address the various problems arising from this situation with systematic,...

Persistent link: https://www.econbiz.de/10011558794

Long-term staffing based on qualification profiles

Drexl, Andreas; Mundschenk, Martin - 2005

Manpower still is one of the most expansive resources, in spite of increasing automation. While employee scheduling and rostering has been the topic of extensive research over the past decades, usually it is assumed that the demand for staff is either given or can be obtained without difficulty....

Persistent link: https://www.econbiz.de/10011558803

An exact algorithm for the vehicle and crew scheduling problem

Friberg, Christian; Haase, Knut - 1996

We present a model for the vehicle and crew scheduling problem in urban public transport Systems by combining models for vehicle and crew scheduling that cover a great variety of real world aspects, especially constraints for crews resulting from wage agreements and internal regulations. The...

Persistent link: https://www.econbiz.de/10011583007