Jan Helge Bøhn

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An inexpensive device was created for computed tomographic (CT)-guided stereotactic biopsy of the canine brain. The accuracy of the device was tested using 16, formalin-perfused, canine head specimens. For each dog, a 6-inch biopsy needle was guided into pituitary gland and caudate nucleus targets. Needle tracks were measured using the CT computer and(More)
This thesis demonstrates the feasibility of using a medial surface transformation as a tool to rapidly approximate the solidification patterns of convex faceted solid models of castings. The medial surface transformation is used to automate the greatest included sphere approach to solidification pattern approximation. The experimental software of this(More)
(Abstract) The goal of this dissertation is to present a systematic approach to integrating the multidisciplinary design process in power electronics through the integration of existing CAD tools, multidisciplinary modeling and system optimization. Two major benefits are expected from the utilization of the proposed integrated design methodology. Firstly,(More)
Existing layered manufacturing systems fabricate parts using a constant build layer thickness. Hence, operators must compromise between rapid production with large surface inaccuracies, and slow production with high precision, by choosing between thick and thin build layers, respectively. Adaptive layered manufacturing methods alleviate this decision by(More)
STEP, or ISO 10303, is a unique and innovative solution to the problem of product data representation and communication. This paper focuses on information modeling in STEP. The data description language EXPRESS is presented, along with a discussion on the modeling of information rather than just data. The process for the construction of Integrated Resources(More)
In recent years, there has been significant attention given to improved methods and tools for engineering design. While advances for the latter stages of design have been impressive, this has not been the case for the early stages of design. In general, advances have provided for either a top-down or a bottom-up approach to design; ignoring the requirements(More)
With the increase dependency on electricity to provide correct form of electricity for lightning, machines, and home and office appliances, the need for the introduction of high reliability power electronics in converting the raw form of electricity into efficient electricity for these applications is uprising. One of the most common failures in power(More)