WorldCat Identities

Gunnarsson, Helene

Overview
Works: 11 works in 26 publications in 4 languages and 28 library holdings
Genres: Criticism, interpretation, etc  Biographies 
Roles: Author
Classifications: PA8595.W65, 634.90151
Publication Timeline
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Most widely held works by Helene Gunnarsson
A combined terminal location and ship routing problem by Helene Gunnarsson( Book )

6 editions published between 2004 and 2006 in English and held by 7 WorldCat member libraries worldwide

Supply chain modeling of forest fuel by Helene Gunnarsson( Book )

4 editions published in 2001 in English and held by 4 WorldCat member libraries worldwide

Integrated production and distribution planning of the supply chain for Sodra Cell AB by Helene Gunnarsson( Book )

4 editions published in 2004 in English and held by 4 WorldCat member libraries worldwide

Detection of ground faults in distribution networks( Book )

2 editions published in 1998 in Danish and English and held by 3 WorldCat member libraries worldwide

Kongehyllest : skrifter av J.J. Wolf og H. Gunnarssøn by Jacob Jacobsen Wolf( Book )

1 edition published in 1991 in Norwegian and held by 2 WorldCat member libraries worldwide

Supply chain optimization in the forest industry by Helene Gunnarsson( Book )

2 editions published in 2007 in English and held by 2 WorldCat member libraries worldwide

The scope of this thesis is modelling and solving large-scale planning problems in the supply chain within the forest industry. Five research papers are included, the first three of which focus on the modelling, and the last two on the solution methods. All problems included are tactical multi-commodity problems expressed as mixed integer programming (MIP) models. The work has been done in collaboration with two Swedish companies within the forest industry. In Paper I, a problem concerning the supply chain of forest fuel for Sydved Energileveranser AB is modelled and solved. We study the problem of deciding when and where forest residues are to be converted into wood chips, and how the residues and chips are to be transported and stored in order to satisfy energy demand at heating plants. The company has long-term contracts with forest owners and saw mills. Decisions in the model include whether or not additional harvest areas and saw mills are to be contracted and which terminals to use. The planning horizon is one year and monthly time periods are used. Papers II--V are based on planning problems at Södra Cell AB. The planning horizon is normally one year. Papers II--III consider only one time period. In Paper II the supply chain from pulp mills to customers is modelled and the combined problem of deciding terminal locations and which ship routes to use is studied. Shipping vessels chartered on short or long term are used to transport products to terminals in Europe. From each terminal, the products are transported to customers by truck, train, or a combination of both. In addition, trains and trucks can be used for transports directly to customers from mills. In Paper III the entire supply chain, from harvest areas to customers, is considered. Decisions included are transportation of raw materials, production mix, the distribution of pulp products, and the selection of potential orders and their quantities at customers. The ship routes are considered as flow links. In Papers IV--V the problems in Papers II--III are combined into one model and several time periods are used. Lagrangian heuristics based on Lagrangian decomposition are used as solution methods in both papers. In Paper IV, the approach leads to subproblems for each time period, whereas in Paper V, another approach that results in subproblems for different parts of the supply chain is developed. All models are based on real data from the companies. The models are detailed and describe the problems accurately. The solution methods are developed such that the solution time is kept within practical limits. Results from Papers II--III have been used by Södra Cell AB to support the change of the terminal structure as well as in budget planning
Optimization approaches to tactical planning problems in the forest industry by Helene Gunnarsson( Book )

3 editions published in 2004 in English and held by 2 WorldCat member libraries worldwide

Optimering kan sänka produktionskostnaderna för skogsbränsle by Helene Gunnarsson( Book )

1 edition published in 2001 in Swedish and held by 1 WorldCat member library worldwide

Solving a multi-period supply chain problem for a pulp industry using Lagrangian heuristics based on physical stages by Helene Gunnarsson( Book )

1 edition published in 2007 in English and held by 1 WorldCat member library worldwide

Solving a multi-period supply chain problem for a pulp industry using Lagrangian heuristics based on time periods by Helene Gunnarsson( Book )

1 edition published in 2007 in English and held by 1 WorldCat member library worldwide

Solving a multi-period supply chain problem for a pulp company using heuristics--An application to Södra Cell AB by Helene Gunnarsson( )

1 edition published in 2008 in English and held by 1 WorldCat member library worldwide

In this paper, the integrated planning of production and distribution for a pulp company is considered. The tactical decisions included regard transportation of raw materials from harvest areas to pulp mills; production mix and contents at pulp mills; inventory; distribution of pulp products from mills to customers and the selection of potential orders and their levels at customers. The planning period is one year and several time periods are included. As a solution approach we make use of two different heuristic approaches. The main reason to use heuristics is the need for quick solution times. The first heuristic is based on a rolling planning horizon where iteratively a fixed number of time periods is taken into consideration. The second heuristic is based on Lagrangian decomposition and subgradient optimization. This provides optimistic bounds of the optimal objective function value that are better than the LP relaxation value, which can be used as a measure of the heuristic (pessimistic) solution quality. In addition, we apply the proposed rolling horizon heuristic in each iteration of the subgradient optimization. A number of cases based on real data is analysed which shows that the proposed solution approach is simple and provides high quality solutions
 
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Audience level: 0.93 (from 0.88 for Supply cha ... to 0.97 for Detection ...)

Alternative Names
Gunnarsson, H.

Gunnarsson, H. (Helene)

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