WorldCat Identities

Mortensen, John

Overview
Works: 30 works in 40 publications in 3 languages and 204 library holdings
Genres: Commentaries  Academic theses 
Roles: Editor, Author
Classifications: BS2665, 227.107
Publication Timeline
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Most widely held works about John Mortensen
 
Most widely held works by John Mortensen
Commentary on the letter of Saint Paul to the Hebrews by Thomas( Book )

3 editions published in 2012 in English and held by 78 WorldCat member libraries worldwide

Commentary on the letter of Saint Paul to the Romans by Thomas( Book )

1 edition published in 2012 in English and held by 76 WorldCat member libraries worldwide

Sæt dig et mål spejder- og gildesange by Kolding Kammerkor( Recording )

3 editions published in 1993 in Danish and held by 6 WorldCat member libraries worldwide

Classification of certain non-simple C*-algebras by J Mortensen( Book )

3 editions published in 1996 in English and held by 5 WorldCat member libraries worldwide

Rutelægning med tidsrestriktioner v.h.a. variable splitting( Book )

1 edition published in 1986 in Danish and held by 4 WorldCat member libraries worldwide

Skatteydernes A.B.C. Hvad en Skatteyder bør vide( Book )

1 edition published in 1923 in Danish and held by 3 WorldCat member libraries worldwide

Skatteyderens A.B.C. : Hvad en Skatteyder bør vide by J Mortensen( Book )

2 editions published in 1924 in Danish and held by 3 WorldCat member libraries worldwide

Sveriges national-litteratur 1500-1900 : Carl Jonas Love Almquist by C. J. L Almqvist( Book )

1 edition published in 1909 in Swedish and held by 2 WorldCat member libraries worldwide

Virtual light fields for global illumination in computer graphics by J Mortensen( Book )

2 editions published in 2011 in English and held by 2 WorldCat member libraries worldwide

This thesis presents novel techniques for the generation and real-time rendering of globally illuminated environments with surfaces described by arbitrary materials. Real-time rendering of globally illuminated virtual environments has for a long time been an elusive goal. Many techniques have been developed which can compute still images with full global illumination and this is still an area of active flourishing research. Other techniques have only dealt with certain aspects of global illumination in order to speed up computation and thus rendering. These include radiosity, ray-tracing and hybrid methods. Radiosity due to its view independent nature can easily be rendered in real-time after pre-computing and storing the energy equilibrium. Ray-tracing however is view-dependent and requires substantial computational resources in order to run in real-time. Attempts at providing full global illumination at interactive rates include caching methods, fast rendering from photon maps, light fields, brute force ray-tracing and GPU accelerated methods. Currently, these methods either only apply to special cases, are incomplete exhibiting poor image quality and/or scale badly such that only modest scenes can be rendered in real-time with current hardware. The techniques developed in this thesis extend upon earlier research and provide a novel, comprehensive framework for storing global illumination in a data structure - the Virtual Light Field - that is suitable for real-time rendering. The techniques trade off rapid rendering for memory usage and precompute time. The main weaknesses of the VLF method are targeted in this thesis. It is the expensive pre-compute stage with best-case O(N 2) performance, where N is the number of faces, which make the light propagation unpractical for all but simple scenes. This is analysed and greatly superior alternatives are presented and evaluated in terms of efficiency and error. Several orders of magnitude improvement in computational efficiency is achieved over the original VLF method. A novel propagation algorithm running entirely on the Graphics Processing Unit (GPU) is presented. It is incremental in that it can resolve visibility along a set of parallel rays in O(N) time and can produce a virtual light field for a moderately complex scene (tens of thousands of faces), with complex illumination stored in millions of elements, in minutes and for simple scenes in seconds. It is approximate but gracefully converges to a correct solution; a linear increase in resolution results in a linear increase in computation time. Finally a GPU rendering technique is presented which can render from Virtual Light Fields at real-time frame rates in high resolution VR presentation devices such as the CAVETM
C[arl] J[onas] L[ove] Almquist by Johan Mortensen( Book )

2 editions published between 1922 and 1925 in Swedish and held by 2 WorldCat member libraries worldwide

Fantastiske Æventyr fra Svendborg og Omegn, fortalte af J. Mortensen( Book )

1 edition published in 1898 in Danish and held by 2 WorldCat member libraries worldwide

1800-talets äldre prosadiktare II : Emilie Flygare-Carlén, August Blanche, Orvar Odd, Onkel Adam( Book )

1 edition published in 1922 in Swedish and held by 2 WorldCat member libraries worldwide

Exploring novel objective functions for simulating muscle coactivation in the neck( )

1 edition published in 2018 in English and held by 1 WorldCat member library worldwide

Abstract: Musculoskeletal modeling allows for analysis of individual muscles in various situations. However, current techniques to realistically simulate muscle response when significant amounts of intentional coactivation is required are inadequate. This would include stiffening the neck or spine through muscle coactivation in preparation for perturbations or impacts. Muscle coactivation has been modeled previously in the neck and spine using optimization techniques that seek to maximize the joint stiffness by maximizing total muscle activation or muscle force. These approaches have not sought to replicate human response, but rather to explore the possible effects of active muscle. Coactivation remains a challenging feature to include in musculoskeletal models, and may be improved by extracting optimization objective functions from experimental data. However, the components of such an objective function must be known before fitting to experimental data. This study explores the effect of components in several objective functions, in order to recommend components to be used for fitting to experimental data. Four novel approaches to modeling coactivation through optimization techniques are presented, two of which produce greater levels of stiffness than previous techniques. Simulations were performed using OpenSim and MATLAB cooperatively. Results show that maximizing the moment generated by a particular muscle appears analogous to maximizing joint stiffness. The approach of optimizing for maximum moment generated by individual muscles may be a good candidate for developing objective functions that accurately simulate muscle coactivation in complex joints. This new approach will be the focus of future studies with human subjects
Informationssøgning på Esbjerg Tekniske Bibliotek : hefte 1 : søgning i bøger by J Mortensen( Book )

1 edition published in 1989 in Danish and held by 1 WorldCat member library worldwide

Kompendium i hydraulik by J Mortensen( Book )

1 edition published in 1976 in Danish and held by 1 WorldCat member library worldwide

Fantastiske Æventyr fra Svendborg og Omegn by J Mortensen( Book )

1 edition published in 1898 in Danish and held by 1 WorldCat member library worldwide

Teaching World Englishes and English in the world: : a teaching module for an upper secondary school class in Denmark( )

1 edition published in 2016 in English and held by 1 WorldCat member library worldwide

Modeller af komplicerede systemer 1-2 + bilag + appendices( Book )

1 edition published in 1991 in Danish and held by 1 WorldCat member library worldwide

Geoteknik, fundering og havnebygning. Bd. 2-3( Book )

1 edition published in 1963 in Danish and held by 1 WorldCat member library worldwide

 
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Audience level: 0.56 (from 0.45 for Commentary ... to 0.98 for Skatteyder ...)

Associated Subjects
Languages
Danish (14)

English (11)

Swedish (6)