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ReferencesNavigation arrowAuthorsNavigation arrowDimitris Nathanael
May 23

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Dimitris Nathanael

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Publications by Dimitris Nathanael (bibliography)

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2010
 
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Papakostopoulos, Vassilis, Nathanael, Dimitris and Marmaras, Nicolas (2010): An explorative study of visual scanning strategies of motorcyclists in urban environment. In: Proceedings of the 2010 Annual European Conference on Cognitive Ergonomics 2010. pp. 157-160.

“Motivation -- To identify the objects/entities that determine the ontology of the motorcyclist's visual exploration activity, when driving in urban arterials. This ontology may form the basis for modelling the motorcyclists' visual activity in urban traffic as well as shed light in their interaction with automobile drivers. Research approach -- An explorative naturalistic field study was conducted, using the eye-tracking method, in which three experienced motorcyclists were asked to drive normally in a predefined route consisting of three road sections: motorway, avenue, local urban two way street. Immediately after driving an interview of each participant was conducted using the video assisted autoconfrontation method. Findings/Design -- The results suggest that (i) visual scan patterns of motorcyclists in urban arterials are much more vivid compared to those in motorway and extend well beyond formal signals, (ii) to minimize the cognitive effort of scanning motorcyclists seek for specific cues to monitor the future intentions of the other road users (iii) motorcyclists feel more vulnerable than car drivers, which leads them to recurring visual checks of the points of concern. Research limitations/Implications -- The results presented are based on a small sample of motorcyclists. In the near future we intend to extend our sample of participants and to perform formal protocol analysis of the a-posteriory, verbalizations. Originality/Value -- One of the very few naturalistic field studies of motorcyclist visual exploration activity in urban environment using eye tracking and autoconfrontation. Promises to offer fresh insights to safety measures for motorcyclists. Take away message -- Urban driving scan patterns of motorcyclists are very systematic and recurring across situations and participants. Fixation points are rarely directed to road elements as such. Fixations tend to be clearly directed at specific points (e.g. side mirrors, car wheels, rear edge of car roofs) that convey information about the other road users' state and intentions.”

© All rights reserved Papakostopoulos et al. and/or their publisher

 
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Papakostopoulos, Vassilis, Spanou, Eleana-Georgia, Nathanael, Dimitris and Gkikas, Kostas (2010): Understanding overtaking, beyond limitations of the visual system in making spatiotemporal estimations. In: Proceedings of the 2010 Annual European Conference on Cognitive Ergonomics 2010. pp. 169-172.

“Motivation -- To enrich our understanding of the factors that influence the decision to overtake against two way traffic, and this, beyond the limitations of the human visual system in making spatiotemporal estimations. Such understanding may be valuable for the design of future adaptive aid systems. Research approach -- An explorative naturalistic observation was conducted with a vehicle equipped with three cameras travelling at normal speed for a total distance of 300 km. 40 unobtrusive observations of overtaking episodes were recorded. Findings/Design -- The data is still at the analysis stage. There is however evidence that before the decision to overtake (i) there is a preparation phase prior to the initiation of the overtaking manoeuvre which deals with the intentions/state of the driver ahead and (ii) frequent users of the particular road will use their specific knowledge and initiate overtaking manoeuvres Research limitations/Implications -- The study has an explorative character mainly for generating hypotheses and cannot as such prove its findings without subsequent complementary methods. Originality/Value -- A contribution of the present paper is on the observation method which ensures the collection of data with a high degree of ecological validity. Take away message -- Spatiotemporal estimation just prior to manoeuvre initiation is only one of the factors influencing the decision to overtake. For understanding naturally occurring overtaking manoeuvres longer time frames of analysis are needed.”

© All rights reserved Papakostopoulos et al. and/or their publisher

 
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Nathanael, Dimitris, Vosniakos, George-Christopher and Mosialos, Stergios (2010): Cognitive task analysis for virtual reality training: the case of CNC tool offsetting. In: Proceedings of the 2010 Annual European Conference on Cognitive Ergonomics 2010. pp. 241-244.

“Motivation -- To examine if cognitive task analysis of expert machinists can be effective in developing a virtual reality based training system for CNC tool offsetting. Research approach -- A cognitive task analysis of expert machinists was conducted which informed the development of a VR training system for CNC tool offsetting. Subsequently the effectiveness of the analysis was evaluated by conducting an experiment with 31 mechanical engineering students. Findings/Design -- The virtual reality system demonstrated positive training transfer for the task of tool offsetting. The above indicates that the cognitive task analysis performed was effective in identifying a number of key skills of the tool offsetting task. Research limitations/Implications -- The study does not prove the superiority of cognitive task analysis over other approaches for specifying virtual reality training systems, since it does not compare the cognitively tuned system with another one. Originality/Value -- The present work provides evidence that skill transfer can be achieved even with low physical fidelity provided that the cognitive organization of a task is adequately mapped in the virtual reality system. Take away message -- Further and beyond fidelity issues, cognitive task analysis can provide important input in specifying effective VR training systems.”

© All rights reserved Nathanael et al. and/or their publisher

 
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May 23

“ Knowledge is commonly socially constructed, through collaborative efforts towards shared objectives or by dialogues and challenges brought about by different persons' perspectives. ”

-- G. Salomon (in "Distributed Cognitions: Psychological and Educational Considerations")

 
 

Featured chapter

Read the fascinating history of Wearable Computing, told by its father, Steve Mann

Read Steve's chapter !

 
 

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