Search results for "Dean"

Lung CT Image Registration through Landmark-constrained Learning with Convolutional Neural Network

2020

Accurate registration of lung computed tomography (CT) image is a significant task in thorax image analysis. Recently deep learning-based medical image registration methods develop fast and achieve promising performance on accuracy and speed. However, most of them learned the deformation field through intensity similarity but ignored the importance of aligning anatomical landmarks (e.g., the branch points of airway and vessels). Accurate alignment of anatomical landmarks is essential for obtaining anatomically correct registration. In this work, we propose landmark constrained learning with a convolutional neural network (CNN) for lung CT registration. Experimental results of 40 lung 3D CT …

An overdetermined problem for the anisotropic capacity

2015

We consider an overdetermined problem for the Finsler Laplacian in the exterior of a convex domain in \({\mathbb {R}}^{N}\), establishing a symmetry result for the anisotropic capacitary potential. Our result extends the one of Reichel (Arch Ration Mech Anal 137(4):381–394, 1997), where the usual Newtonian capacity is considered, giving rise to an overdetermined problem for the standard Laplace equation. Here, we replace the usual Euclidean norm of the gradient with an arbitrary norm H. The resulting symmetry of the solution is that of the so-called Wulff shape (a ball in the dual norm \(H_0\)).

Continuity of the radon transform and its inverse on Euclidean space

1983

Design of a VR application for pilots as a complementary tool for procedure training of Abnormal Operations

2021

Master's thesis in Multimedia and educational technology (MM506) The aviation industry has been amongst the early adopters of VR for educational purposes, even since the very beginning of VR’s technology establishment and throughout its further development. Flight simulators are invaluable as they let pilots and instructors replicate any situation for learning full control over the plane and improve situational awareness without paying the price of life-safety if using an actual aircraft. Abnormal operations and their procedures are a key subject of safety training, where pilots have to understand and memorize particular orders of actions in order to solve a dangerous situation on board. A …

VR formidling av en kunstnerisk opplevelse : Dette prosjektet er en interaktiv kunstinstallasjon laget i VR for Sørlandets Kunstmuseum

2021

Master's thesis in Multimedia and educational technology (MM506) I denne masteroppgaven har vi laget en VR-simulering for Sørlandets Kunstmuseum i Kristiansand. Ønsket med denne formidlingen var å vekke kunstinteressen hos publikum og undersøke om dette kan være et medium som kan bidra til økt museumsbesøk. Prosjektet har tatt utgangspunkt i fire verk som er malt av den norske kunstneren Reidar Aulie. Det har blitt utført en metodetriangulering brukeranalyse med VR-simuleringen og tradisjonell kunst, som har vært med på å dra sammenligninger mellom de to ulikeformidlingene. Dette har vært med på å bekrefte eller avkrefte vår hypotese; Bruk av VR i formidling av kunst vil bidra til større in…

Investigating Motion Sickness in Racing Simulators using Virtual Reality and a Motion Platform

2021

Master's thesis in Multimedia and educational technology (MM506) Motion sickness has been a downside of virtual reality since its beginning. According to the "Sensory conflict" theory, simulation sickness and cybersickness often occurs due to the feeling of self-motion. This thesis aimed to investigate if a motion platform could mitigate simulation sickness. By using commercial available motion platform and virtual reality headset, the experiment had three conditions, one without any added motion, one with motion and the last with increased motion. Participants were put in a complete racing set to drive an Edge 6D motion simulator in Asseto Corsa. The participants drove a high-speed car for…

Real-time video transmission in UMTS

2001

Masteroppgave i informasjons- og kommunikasjonsteknologi 2001 - Høgskolen i Agder, Grimstad Universal Mobile Telecommunication System is denoted as a 3rd cellular system and has been designed with the objective to be a system with global coverage. With the major improvement of in bandwidth capability the Universal Mobile Telecommunications System will be able to support real time multimedia services. This thesis starts with a presentation of the possible video services that can be exploited in third generation cellular systems. Video services are known to be bandwidth consuming and have rigid requirements to the real time requirements. Though the major increase in available bandwidth in the…

A Monge-Kantorovich mass transport problem for a discrete distance

2011

This paper is concerned with a Monge-Kantorovich mass transport problem in which in the transport cost we replace the Euclidean distance with a discrete distance. We fix the length of a step and the distance that measures the cost of the transport depends of the number of steps that is needed to transport the involved mass from its origin to its destination. For this problem we construct special Kantorovich potentials, and optimal transport plans via a nonlocal version of the PDE formulation given by Evans and Gangbo for the classical case with the Euclidean distance. We also study how these problems, when rescaling the step distance, approximate the classical problem. In particular we obta…

A New Iterative Estimation Procedure for the Localization of Passive Stationary Objects from Received RF Signals in Indoor Environments

2019

This paper deals with the localization of passive stationary objects from the received radio- frequency (RF) signals in 3-dimensional (3D) indoor environments. Each object located in the 3D indoor environment is modelled by a single point scatterer. The propagation space is equipped with a multiple-input multiple-output (MIMO) wireless communication system. The employed channel model is flexible and allows to have a line-of-sight (LOS) component as well as single- and double- bounce scattering components. Here, we present a new accurate iterative estimation technique for computing the optimal coordinates as well as the number of the main stationary objects (scatterers) in indoor areas. The …

A New Iterative Procedure for the Localization of a Moving Object/Person in Indoor Areas from Received RF Signals

2019

This paper presents a new iterative estimation method to localize a single moving object or person in non-stationary 3-dimensional (3D) indoor environments from received radiofrequency (RF) signals. The moving object/person is modelled by a moving single point scatterer. The indoor space is equipped with a multiple-input multiple-output (MIMO) communication system. This work starts by introducing a new geometrical channel model which considers the effects of the line-of-sight (LOS) component, the fixed objects located in a room, and the moving object (point scatterer). Then, we present an iterative estimation technique for computing the time-variant (TV) coordinates of the moving scatterer.…