9,122 research outputs found

    Estimating biomass of Macrocystis in the Hopkins Marine Life Refuge (edited by James M. Watanabe)

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    Do private equity buyouts represent value for target shareholders? Premiums in the boom of the early 2000s

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    This study compares the takeover premiums for 55 private equity buyouts with 59 takeovers involving a public acquirer, from the US takeover market between 2004 and 2007. This investigation takes place amidst accusations of anti-competitive behavior against some of the most active private equity groups in the US. While controlling for several other factors that might affect the takeover premium, we find weak evidence that bid premiums are significantly lower for target firms undergoing a private equity takeover than those subject to takeovers by public companies. We also demonstrate that abnormal returns earned by targets around takeover announcements can be a biased and misleading proxy for takeover premium.

    Accidental immersion and unintentional drowning of rural children: An investigation for the Child Accident Prevention Foundation of New Zealand

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    In New Zealand drowning amongst preschoolers is one of the leading causes of death. The monetary and emotional costs to society are devastating and cannot be underestimated . The need to reduce the high number of deaths and the monetary and emotional costs prompted this research. This research presents the possibility for proactive measures to be taken in this area. In addition, it provides insightful knowledge for parents and educators alike. Ultimately, it seeks to reduce the number of child drownings that occur in the rural environment

    Two Statements on the Bouvia Case

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    Gradient-like observer design on the Special Euclidean group SE(3) with system outputs on the real projective space

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    A nonlinear observer on the Special Euclidean group SE(3)\mathrm{SE(3)} for full pose estimation, that takes the system outputs on the real projective space directly as inputs, is proposed. The observer derivation is based on a recent advanced theory on nonlinear observer design. A key advantage with respect to existing pose observers on SE(3)\mathrm{SE(3)} is that we can now incorporate in a unique observer different types of measurements such as vectorial measurements of known inertial vectors and position measurements of known feature points. The proposed observer is extended allowing for the compensation of unknown constant bias present in the velocity measurements. Rigorous stability analyses are equally provided. Excellent performance of the proposed observers are shown by means of simulations

    An Equivariant Observer Design for Visual Localisation and Mapping

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    This paper builds on recent work on Simultaneous Localisation and Mapping (SLAM) in the non-linear observer community, by framing the visual localisation and mapping problem as a continuous-time equivariant observer design problem on the symmetry group of a kinematic system. The state-space is a quotient of the robot pose expressed on SE(3) and multiple copies of real projective space, used to represent both points in space and bearings in a single unified framework. An observer with decoupled Riccati-gains for each landmark is derived and we show that its error system is almost globally asymptotically stable and exponentially stable in-the-large.Comment: 12 pages, 2 figures, published in 2019 IEEE CD
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