Essays about: "Fredrik Hellman"

Found 2 essays containing the words Fredrik Hellman.

1. 1. Towards the Solution of Large-Scale and Stochastic Traffic Network Design Problems

   University essay from Institutionen för informationsteknologi

   Author : Fredrik Hellman; [2010]
   Keywords : optimization; traffic network design; implicit programming; mathematical programs with equilibrium constraints; cutting plane method; bilevel programming; stochastics; MPEC; SMPEC;

   Abstract : This thesis investigates the second-best toll pricing and capacity expansion problems when stated as mathematical programs with equilibrium constraints (MPEC). Three main questions are rised: First, whether conventional descent methods give sufficiently good solutions, or whether global solution methods are to prefer. READ MORE

3. 2. Basement-cover relationships in the Harkerbreen Group of the northern Ny Friesland Caledonides, Svalbard

   University essay from Lunds universitet/Geologiska institutionen

   Author : Fredrik Hellman; [1994]
   Keywords : Harkerbreen Group; geology; geography; Ny Friesland; Caledonides; Svalbard; basement-cover relationships; Earth and Environmental Sciences;

   Abstract : Mapping and isotopic work in the Instrumentberget area has shown that a granitic gneiss, previously referred to the Bangenhuk Formation, is unconformably overlain by a younger meta-sedimentary unit with a basal conglomerate horizon, previously included in the Rittervatnet Formation. In this paper it is suggested that the granitic gneiss, named the Instrumentberget Granitic Gneiss, occurs at a lower structural level than the Bangenhuk Formation and that this meta-sedimentary unit is the basal part of the Polhem Formation. READ MORE