William Leeson

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Work on levels of detail for human simulation has occurred mainly on a geometrical level, either by reducing the numbers of polygons representing a virtual human, or replacing them with a two-dimensional imposter. Approaches that reduce the complexity of motions generated have also been proposed. In this paper, we describe ongoing development of a framework(More)
This paper describes an efficient framework for implementing global illumination techniques, using object oriented and component object methods. This framework facilitates in the development of new techniques or the implementation of existing techniques. By providing a flexible but comprehensive geometric and numeric architecture. The framework abstracts(More)
This paper presents a rendering framework called EFFIGI (EEcient Framework For Implementing Global Illumination) that uses interfaces which express both geometric concepts and mathematical ones, using object-oriented and component object methods. EFFIGI accelerates the development of new techniques and the implementation of existing ones, by providing a(More)
A shadow of the moon, with a statistical significance of 5σ, has been observed in the underground muon flux at a depth of 2090 mwe using the Soudan 2 detector. The angular resolution of the detector is well described by a Gaussian with σ ≤ 0.3. The position of the shadow confirms the alignment of the detector to better than 0.15. This alignment has remained(More)
S.M. Kasahara, W.W.M. Allison, G.J. Alner, D.S. Ayres, W.L. Barrett , C.R. Bode, P.M. Border, C.B. Brooks, J.H. Cobb, D.J.A. Cockerill, R.J. Cotton, H. Courant, D.M. DeMuth, B. Ewen, T.H. Fields, H.R. Gallagher, M.C. Goodman, R.W.Gran, R.N. Gray, K. Johns, T. Kafka, W. Leeson, P.J. Litchfield, N.P. Longley, M.J. Lowe, W.A. Mann, M.L. Marshak, E.N. May, R.H.(More)
We report a measurement of the atmospheric neutrino flavor ratio, R, using a sample of quasi-elastic neutrino interactions occurring in an iron medium. The flavor ratio (tracks/showers) of atmospheric neutrinos in a 3.9 fiducial kiloton-year exposure of Soudan 2 is 0.64± 0.11(stat.)± 0.06(syst.) of that expected. Important aspects of our main analysis have(More)
A shadow of the moon, with a statistical significance of 5σ, has been observed in the underground muon flux at a depth of 2090 mwe using the Soudan 2 detector. The angular resolution of the detector is well described by a Gaussian with a sigma ≤ 0.3. The position of the shadow confirms that the alignment of the detector is known to better than 0.15 and has(More)
S.M. Kasahara, W.W.M. Allison, G.J. Alner, D.S. Ayres, W.L. Barrett , C.R. Bode, P.M. Border, C.B. Brooks, J.H. Cobb, D.J.A. Cockerill, R.J. Cotton, H. Courant, D.M. DeMuth, B. Ewen, T.H. Fields, H.R. Gallagher, M.C. Goodman, R.W.Gran, R.N. Gray, K. Johns, T. Kafka, W. Leeson, P.J. Litchfield, N.P. Longley, M.J. Lowe, W.A. Mann, M.L. Marshak, E.N. May, R.H.(More)
The absorption of cosmic rays by the sun produces a shadow at the earth. The angular offset and broadening of the shadow are determined by the magnitude and structure of the interplanetary magnetic field (IPMF) in the inner solar system. We report the first measurement of the solar cosmic ray shadow by detection of deep underground muon flux in observations(More)
We have searched for the proton decay mode p → ν K using the one-kiloton Soudan 2 high resolution calorimeter. Contained events obtained from a 3.56 kilotonyear fiducial exposure through June 1997 are examined for occurrence of a visible K track which decays at rest into μν or ππ. We found one candidate event consistent with background, yielding a limit,(More)