210,901 research outputs found
Haptic gas pedal feedback for active car-following support
No full textThe research presented in this dissertation focuses on supporting drivers in the longitudinal control of their vehicle during car-following. The goal of the research is the human-centred development of a haptic gas pedal interface that comfortably supports drivers in maintaining a safe separation with a leading vehicle during car-following. Two different approaches were found to be suitable for implementation as haptic information providers through the gas pedal. The first approach was to add a force to the gas pedal dynamics which would have to be related to the safe-field-of-travel ahead of the own vehicle and changes therein. The gas pedal dynamics, that is, the force/pedal-position relationship is not changed by this approach. The second approach was to change the stiffness of the gas pedal by adding a virtual stiffness to the inherent stiffness of the gas pedal. By doing so, the dynamics of the gas pedal are changed depending on the changes detected in the safe-field-of-travel. In both approaches, an electrical actuator provides the additional force or stiffness. The main hypothesis of this dissertation is the assumption that with the appropriate haptic feedback of longitudinal traffic information drivers will adopt a force-task in controlling the haptic gas pedal. Experimental verification leads to the conclusion that the stiffness feedback design with time-to-contact information scaled by time headway performs best in this respect.Aerospace Engineerin
Cybernetics of Tunnel-in-the-Sky Displays
No full textConsensus is growing that the flexibility gained with the introduction of programmable, electronic cockpit displays in the 1980s must be exploited to the full extent. An important candidate to become the primary flight display of future flight decks is the tunnel-in-the-sky display, a perspective flight-path display that shows the reference trajectory to be flown in a synthetic three-dimensional world. The usefulness of the tunnel display in the pilot manual aircraft control task is the subject of this thesis. The mainstream of tunnel display research is confined to empirical comparisons of the tunnel display with conventional displays. The approach taken in the present theoretical and experimental study is original and new as it is conducted from the perspective of cybernetics. A four-stage methodology is developed to study the fundamental characteristics of pilot/display interaction, based on a theoretical analysis of information, in particular the information used for control. The information analysis is conducted within the context of Gibson's ecological approach to visual perception. The information analysis provides novel insights into how the tunnel display geometric design variables can affect pilot behavior. To examine the validity of the theoretical hypotheses, six experiments have been conducted. Three experiments examined the effects of manipulating some of the main display design variables, such as the tunnel size, the viewing volume and the presence of guidance symbology. Another three experiments investigated the fundamental characteristics of the tunnel geometrical design in the tasks of following a trajectory that is either straight or circular, and in the task of conducting a curve-interception maneuver. The experiments show that the cybernetic, information-centered approach is indeed very successful in pin-pointing the important characteristics of pilot/display interaction. The experimental methodology employed in this thesis aimed at integrating the model-based approach with the common approach of collecting mainly performance-related data. It is described in detail how experiments can be designed with the objective of conducting a control-theoretic analysis. The limitations of some non-parametric identification methods in multi-axis, multiple loop tracking tasks are described. The use of criterion functions, in both the frequency and the time domain, in the parametric identification methods is also exemplified.Aerospace Engineerin
Parasyntax and the sentential level in axiomatic functionalism
No full textThis thesis is presented as a contribution to the St Andrews School
of Linguistics, Axiomatic Functionalism, as developed by Mulder and
Hervey. It is essentially a piece of Theoretical Linguistics which
outlines an approach to the hitherto undeveloped areas of Parasyntax
and the Sentential Level in Axiomatic Functionalism.
The theoretical arguments are supported by descriptive hypotheses
concerning the nature of Spoken English. These descriptions are
corpus-based.
The conclusion reached by the author is that not only are Parasyntax
and the Sentential Level distinct in theory (this is axiomatic), but
they are also distinct in their application as regards methodology
and description. This conclusion will undoubtedly prove to be
controversial in the light of recent developments in Axiomatic
Functionalism concerning the Postulates in particular (of which the
author was at the time of writing unaware), and in the light of
other Functionalist approaches to the nature of intonation and
sentences.
It is anticipated that this thesis will be of value to those
interested in Functionalism as well as those concerned with
intonation and the levels of language beyond syntax
Molecular Characterization of Nonpolypoid Colorectal Adenomas
Full text linkMeijer, G.A. [Promotor]Mulder, C.J.J. [Promotor]Carvalho, B. [Copromotor]Engeland, M. van [Copromotor
Capsule Endoscopy: The revolution of small bowel endoscopy
Full text linkMulder, C.J.J. [Promotor]Franchis, R. de [Promotor]Vecchi, M. [Copromotor]Jacobs, M.A.J.M. [Copromotor
Naschrift op artikel van Drs. M. Mulder De invloed van strategie op onder- nemingsprestaties
No full textNaschrift op artikel van Drs. M. Mulder De invloed van strategie op onder- nemingsprestatie
L. Betzig, M. Borgerhoff Mulder, P. Türke, eds., Human Reproductive Behavior. A Darwinian Perspective
No full textGuille-Escuret Georges. L. Betzig, M. Borgerhoff Mulder, P. Türke, eds., Human Reproductive Behavior. A Darwinian Perspective. In: L'Homme, 1990, tome 30 n°114. pp. 149-151
Macht en hulp in de theoretische hoogbouw. Een kritiek op de machtsexperimenten van M. Mulder
No full textA critique of 2 books by M. Mulder, a theoretical study, Groepstructuur, Motivatie en Prestatie (Group Structure, Motivation and Achievement, The Hague: COP, 1958) and a report on several experts, Mensen, Groepen, Organisaties (Men, Groups, Organizations, Assen, 1963). Mulder\u27s concept of help is vitiated by his treating psychol\u27al and sociological phenomena as interchangeable values; his exp\u27al studies of help suffer from his belief that his S\u27s are interchangeable. Experimental methods can, in any case, do little to determine the basic motivations of help; the most they can do is to study willingness to help as a social phenomenon. I. Langnas
Mulder (A. W. J.). Juliana van Stolberg. « Ons aller Vrouwe-Moeder ».
No full textVan Durme M. Mulder (A. W. J.). Juliana van Stolberg. « Ons aller Vrouwe-Moeder ».. In: Revue belge de philologie et d'histoire, tome 21, 1942. pp. 316-318
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