Results 261 to 270 of about 174,445 (306)
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A framework for dynamic position determination
Proceedings of the 6th International Conference on Mobile Technology, Application & Systems - Mobility '09, 2009This paper presents a brief survey of typical examples of systems in the field of position determination and identifies a need for a further research. This is followed by a description of a managed positioning environment for indoor and outdoor surroundings, in which accuracy and precision can be improved by using a mix of fixed sensors and the sensing
Saana Pauliina Liimatainen, David Grey
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Exploring the dynamic measurement of position
Proceedings. Sixth International Symposium on Wearable Computers,, 2003This paper describes the development of several methods for the dynamic measurement of error distribution for positioning systems. When a user moves along a path at an unknown speed, it is no longer feasible to calculate the distance between the measured and real positions. We outline three applications using different positioning systems and apply our
Randell, CN, Muller, HL
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On the dynamics of piezoactuated positioning systems
Review of Scientific Instruments, 2008Piezoelectric actuators (PEAs) are commercially available for producing extremely small displacements. If a PEA is used to drive a positioning mechanism, the combined dynamics is approximated empirically by that of a second-order system. However, the rationale for such an approximation is lacking in the literature, thus leaving some issues unaddressed,
X B, Chen +3 more
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Dynamic mooring-forces allocation in dynamic ship positioning
Journal of Optimization Theory and Applications, 1989The design of a dynamic positioning system for a multiply-moored vessel with active winches and thrusters is presented. The proposed positioning system is based on Kalman filter and linear optimal control. Its peculiarity is that it contains a scheme which allocates dynamically the control forces between moorings and thrusters.
AMBROSINO, GIUSEPPE +2 more
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Nonlinear positive observer design for positive dynamical systems
Proceedings of the 2010 American Control Conference, 2010In this paper, the observer design problem is considered for a class of positive dynamical systems. First, we establish a set of sufficient conditions for the design of a general class of positive nonlinear observers for nonlinear positive dynamical systems.
Brian, Ben, Wang, Jing, Qu, Zhihua
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On the Dynamical Interplay of Positive and Negative Affects
Neural Computation, 2017Emotional disorders and psychological flourishing are the result of complex interactions between positive and negative affects that depend on external events and the subject’s internal representations. Based on psychological data, we mathematically model the dynamical balance between positive and negative affects as a function of the response to ...
Jonathan Touboul +2 more
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Proceedings of the 5th Nordic conference on Human-computer interaction: building bridges, 2008
This paper describes the first steps of a research project directed towards human computer interaction (HCI) within the maritime environment and on maritime equipment. The focus is at this stage mainly on interaction with Dynamic Positioning Systems (DP) and how new interaction styles can be introduced to make the interaction more efficient and less ...
Frøy Birte Bjørneseth +2 more
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This paper describes the first steps of a research project directed towards human computer interaction (HCI) within the maritime environment and on maritime equipment. The focus is at this stage mainly on interaction with Dynamic Positioning Systems (DP) and how new interaction styles can be introduced to make the interaction more efficient and less ...
Frøy Birte Bjørneseth +2 more
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Tuning a dynamic positioning system
Automatica, 1993Abstract The tuning of a complex control system used in ships and semisubmersible oil drilling rigs was studied. A method was sought which minimizes the time needed to tune a manned ship. Three different methods were compared to estimate the parameters of the nonlinear state filters used in the control system.
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Reduced Dynamics Need Not Be Completely Positive
Physical Review Letters, 1994The reduced dynamics of a quantum system in contact with a reservoir is generally thought to be "completely positive"; this is certainly true if product initial conditions are used to define the dynamics. We show that with correlated initial conditions it need not be so.
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Dynamic Stability of a Dynamically Positioned Vessel
1971Dynamic stability is one of the basic requirements which must be satisfied if the dynamic positioning system is to be successful.
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