liu.seSearch for publications in DiVA
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Pulp fact, not fiction
Linköping University, Department of Mathematics, Optimization. Linköping University, The Institute of Technology.
Billerud AB, Skärblacka, Sweden.
Linköping University, Department of Mathematics, Optimization. Linköping University, The Institute of Technology.
2005 (English)In: OR/MS Today, ISSN 1085-1038, Vol. 32, no 2, p. 42-47Article in journal (Refereed) Published
Abstract [en]

By taking the guesswork out of the equation, operations research-based process control system helps cut costs, reduce environmental impact at Swedish paper mill.

Place, publisher, year, edition, pages
2005. Vol. 32, no 2, p. 42-47
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-85522OAI: oai:DiVA.org:liu-85522DiVA, id: diva2:571190
Available from: 2012-11-21 Created: 2012-11-21 Last updated: 2023-07-28
In thesis
1. Application of operations research in operative planning in the forest industry
Open this publication in new window or tab >>Application of operations research in operative planning in the forest industry
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The focus of this thesis is the use of Operations Research for pplications in the forest industry. Optimization models and methods have been developed for problems in the forest supply chain and they have been integrated in decision support systems. The problems considered in this thesis are operative with a planning horizon of less than a month. Short solution times for the methods and the feasibility of the models used are important aspects. The body of this thesis consists of eight research papers where six of them consider operative problems and follows the forest supply chain. The industrial applications include routing of forwarders, routing of logging trucks, a process control problem, and roll cutting problems. The other two papers consider an operative planning problem in the home care sector. They are spin offs from one of the other projects in this thesis. In these applications both linear and nonlinear problems occur.

The forwarding problem is to decide routes for forwarders to pick up the small piles of logs the harvesters have left in the harvest areas. The forwarders then put the logs adjacent to forest roads. The logging truck problem is to decide routes for logging trucks to pick up the piles created by the forwarders and transport them to demand points, for example pulp or paper mills. The process control problem appear in the bleaching stage of a pulp mill where the control variables are the bleaching chemical charges. The cost of bleaching chemicals is minimized while a finishing brightness within target values is ensured. Mainly two roll cutting problems are studied. One is to minimize the number of cutting patterns and one is to minimize the number of reels when defects in the papper reels are considered. The solution methods developed for the forwarding problem have also been applied to a routing problem which appears in staff planning for home care operations.

The different DSS developed and implemented have been tested and several are in daily industrial use. In each of the papers, we have developed robust OR models and quick and effective OR methods. The savings from using the systems vary but are typically in the range 5-20%.

Place, publisher, year, edition, pages
Matematiska institutionen, 2007. p. 31
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1104
Keywords
operative planning, routing, forestry, modelling, Decision Support System, optimization, OR in practice
National Category
Computational Mathematics
Identifiers
urn:nbn:se:liu:diva-8806 (URN)978-91-85831-91-3 (ISBN)
Public defence
2007-05-30, C3, Hus C, Campus Valla, Linköpings Universitet, Linköping, 10:10 (English)
Opponent
Supervisors
Available from: 2007-12-04 Created: 2007-12-04 Last updated: 2012-11-22

Open Access in DiVA

No full text in DiVA

Other links

Link to full article

Authority records

Flisberg, PatrikRönnqvist, Mikael

Search in DiVA

By author/editor
Flisberg, PatrikRönnqvist, Mikael
By organisation
OptimizationThe Institute of Technology
In the same journal
OR/MS Today
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 147 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf