Sökning: "petter ericson"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden petter ericson.

  1. 1. Complexity and expressiveness for formal structures in Natural Language Processing

    Författare :Petter Ericson; Henrik Björklund; Frank Drewes; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; graph grammars; formal languages; natural language processing; parameterized complexity; abstract meaning representation; tree automata; deterministic tree-walking transducers; mildly context-sensitive languages; hyperedge replacement; tree adjoining languages; minimally adequate teacher;

    Sammanfattning : The formalized and algorithmic study of human language within the field of Natural Language Processing (NLP) has motivated much theoretical work in the related field of formal languages, in particular the subfields of grammar and automata theory. Motivated and informed by NLP, the papers in this thesis explore the connections between expressibility – that is, the ability for a formal system to define complex sets of objects – and algorithmic complexity – that is, the varying amount of effort required to analyse and utilise such systems. LÄS MER

  3. 2. Order-preserving graph grammars

    Författare :Petter Ericson; Henrik Björklund; Frank Drewes; Sebastian Maneth; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Graph grammars; graph parsing; graph series; hyperedge replacement; uniform parsing problem; abstract meaning representation; semantic modelling; order preservation; reentrancy preservation; minimally adequate teacher; weighted graph grammars;

    Sammanfattning : The field of semantic modelling concerns formal models for semantics, that is, formal structures for the computational and algorithmic processing of meaning. This thesis concerns formal graph languages motivated by this field. LÄS MER

  4. 3. Simulation-Based Optimization of a Series Hydraulic Hybrid Vehicle

    Författare :Katharina Baer; Petter Krus; Liselott Ericson; Seppo Tikkanen; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Hybrid transmissions are characterized by their utilization of more than one form of energy storage. They have the potential to help reduce overall fuel consumption and vehicle emissions by providing the possibility of brake energy recuperation and prime mover operation management. LÄS MER

  5. 4. Fluid Power Pumps and the Electrification : With a Focus on Discrete Displacement Control in Load Handling Applications

    Författare :Samuel Kärnell; Liselott Ericson; Petter Krus; Maria Pettersson; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : More and more vehicles are being electrified. Mobile working machines and heavy trucks are not excluded, and these machines are often hydraulically intense. Electrification entails new requirements for the hydraulic system and its components, and these requirements must be taken into consideration. LÄS MER

  7. 5. On Electrified Fluid Power Systems in Mobile Machinery

    Författare :Samuel Kärnell; Liselott Ericson; Petter Krus; Rudolf Scheidl; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fluid power; Electrification; Variable displacement; Pump-controlled systems;

    Sammanfattning : High power density in combination with flexible power distribution possibilities and extreme robustness are reasons why fluid power has been the preferred technology in mobile machinery, such as excavators and cranes, since the mid-20th century. In principle, the machines have been powered by a combustion engine which powers a pump, with the output from the pump being distributed to different functions via valves. LÄS MER