15 uppsatser
… planning and follow-up of logging operations. The decision-support involves linear programming in order to minimize the cost of cross cutting losses, delivery bonus-losses and moving the logging machines from on logging unit to another. The aim is to increase the adaptability …
… and interviews of knowledgeable people within the sector. A mixed integer linear programming model is developed in order to find the most profitable strategy. The results that emerge from this study indicate economic feasibility of farm-based grain handling facilities when seed …
… GAMS och reMIND. GAMS baseras på optimeringsmetoden Mixed Integer Non Linear Programming (MINLP) och reMIND baseras på Mixed Integer Linear Programming (MILP). Resultatet från modellen visar att systemet kunnat spara in cirka 1 MSEK under 1 februari 2012 genom att göra …
Denna uppsats behandlar en algoritm som löser linjära optimeringsproblem. Algoritmen bygger på en liknande idé som simplexalgoritmen men i denna kan startvärdet även vara en punkt inom tillåtet område eller på randen till detta område. Det behöver inte nödvändigtvis vara en …
… flight control system for the entire flight envelope has been carried out. Linearization of the dynamic model and programming design environment are used as development tools. The control system has been tested and verified in real-time simulator. Linear quadratic optimization …
… routine is based on Green-Ampt, groundwater is modelled assuming a linear reservoir and the flow routing is done with the kinematic wave equation combined with Manning’s equation. The GIS and the hydrologic model are embedded in one another, allowing calculation of each …
… discharge changes among other things. The first model is a mixed integer linear model (MILP) where the power production is expressed in integers and continuous variables. Minimal discharge, prohibited intervals and non decreasing marginal production equivalent are also included …
… when loading a truck and potential costs for drying. This study is based on linear programming where the crops and grain handling systems constitute the activities. Crop rotation effects are also considered in the model. The results show that two handling alternatives emerges as …
en fallstudie på Holmen Skog
… problem was divided into a hierarchy of two problem levels. For each level, a linear programming problem was formulated. The top level included the entire area, and the lower level was applied for each of a number of subareas. A number of different problems were solved, with …
… membranes. In the membranes there are motion sensitive receptors, detecting linear accelerations of the head. A requirement of the model was to make it so that it could be implemented in the user interface. The work started by examining previous articles concerning this field of …
… not been found. The relations between prices and volumes are now described via linear functions that could be transformed to nonlinear functions in future versions of the model in case empirical data supporting such functions will become available. Finally the model itself is a …
Sönderdelning och transport av GROT (grenar och toppar) kräver dyra maskinsystem samtidigt som efterfrågan av sortimenteten varierar kraftigt under året. Det är därför svårt att planera flöden av GROT-flis effektivt och samtidigt välja rätt maskinsystem. AB Karl Hedin är en …
a sunny story?
In Sweden there is a large interest in renewable energy but the market for solar power is still small compared to other countries such as Germany. Here many farmers produce their own electricity. The Federation of Swedish farmers have acknowledged the potential for Swedish …
Optimering av avfallsbränsleblandning och lagerhållning av importerat avfallsbränsle vid Vattenfalls fjärrvärmeverk i Uppsala
Fjärrvärmebranschen i Sverige har sedan mitten av 1990-talet varit i en stagnationsfas, där mängden producerad och förbrukad energi i stort sett varit konstant, trots stora investeringar i fjärrvärmenätet. Samtidigt har den höga andelen återvinning gjort att det råder brist på …
… fjärrvärmenät måste optimeras. I denna rapport presenteras en ”Mixed integer linear programming” modell över Skogsbacka kraftvärmeverk, dess ackumulatortank, extrapannor och Lyckseles fjärrvärmenät tänkt att kortsiktigt optimera energiproduktionen. Kraftvärmeverket har en …
