by T.E. Djaferis and S.K. Mitter. / Bibliography: p. [26-27] / "January 1982." / NSF Grant ECS-8006896 AFOSR grant AFOSR-80-0155

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1986. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING / Bibliography: leaf 84. / by Robert Gould Gibson. / M.S.

<p> The objective of this project was to construct pollen-climate transfer functions for the Western Interior of Canada and to apply these to dated fossil pollen records to obtain estimates of past climates.</p> <p> Climate curves from the calibration functions were constructed for summer precipitation and temperature, fall precipitation and temperature, winter temperature, and spring temperature.</p> <p> The palaeotemperature estimates suggest winter and fall temperatures were warmer during the mid-Holocene whereas the summer and spring temperatures suggest there was no significant difference in temperature between this time and the present. Results are not in accordance with the Milankovitch estimates of Holocene insolation variation or the conclusions of previous palaeoclimatic studies in the region.</p> <p> The palaeoprecipitation estimates constructed indicate decreased precipitation during the mid-Holocene. Increased aridity in the mid-Holocene is consistent with both the Milankovitch theory and the results of previous palaeoclimatic reconstructions from the study area. However, it is not clear if the high aridity reflects decreased precipitation or increased evapotranspiration.</p> <p> The theoretical and practical limitations of the pollen-climate transfer function approach to this approach to the estimation of paleoclimates are discussed.</p> / Thesis / Candidate in Philosophy

Direct volume rendering is an algorithm used for displaying three-dimensional scalar data, like image from Computed Tomography. This algorithm makes use of a concept of Transfer functions for assigning optical properties to the data values. We studied two dimensional transfer functions, that besides primary values have additional dataset as an input. In particular, we studied computation of this secondary dataset with respect to the primary image function shape. This was done by analysing eigenvalues of the Hessian matrix in each image point. We proposed one formula and implemented several others for computing the probability that image point belongs to the blood vessel. Powered by TCPDF (www.tcpdf.org)

Benjamin J. Dasher. / "November 20, 1951." / Bibliography: p. 48. / Army Signal Corps Contract DA36-039 sc-100, Project no. 8-102B-0. Dept. of the Army Project no. 3-99-10-022.

R.M. Fano. / "April, 13, 1950." / Army Signal Corps Contract No. W36-039-sc-32037 Project No. 102B. Dept. of the Army Project No. 3-99-10-022.

The effectiveness of direct volume rendered images depends on finding transfer functions which emphasize structures in the underlying data. In order to support this process, we present a spreadsheet-like constructive visual component-based interface, which also allows novice users to efficiently find meaningful transfer functions. The interface uses a programming-by-example style approach and exploits the domain knowledge of the user without requiring visualization knowledge. Therefore, our application automatically analysis histograms with the Douglas-Peucker algorithm in order to identify potential structures in the data set. Sample visualizations of the resulting structures are presented to the user who can refine and combine them to more complex visualizations. Preliminary tests confirm that the interface is easy to use, and enables non-expert users to identify structures which they could not reveal with traditional transfer function editors. / <p>Short paper</p>

Thesis--M. Phil., University of Hong Kong, 1984.

Thesis (PhD)--University of South Australia, 1995

Thesis (PhD)--University of South Australia, 1995