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Can the Efficiency of a Haptic Display be Increased by Short-Time Practice in Exploration?

by Gunnar Jansson, Anna Ivås - Lecture Notes in Computer Science , 2001
"... The main aim was to investigate if short-term practice in exploration with a PHANToM can improve performance. A second aim was to find out if some exploration modes are more successful than other modes. Ten participants practiced exploration of nine blocks of 24 virtual objects distributed over thre ..."
Abstract - Cited by 14 (4 self) - Add to MetaCart
The main aim was to investigate if short-term practice in exploration with a PHANToM can improve performance. A second aim was to find out if some exploration modes are more successful than other modes. Ten participants practiced exploration of nine blocks of 24 virtual objects distributed over

Techniques for Haptic Display of Virtual Objects

by Cagatay Basdogan, Mandayam A. Srinivasan
"... Computer haptics, an emerging field of research that is analogous to computer graphics, is concerned with the generation and rendering of haptic virtual objects. In this paper, we propose an efficient haptic rendering method for displaying the feel of 3-D polyhedral objects in virtual environments ( ..."
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independent of the number of polygons that represent the object. We also propose efficient methods for displaying surface properties of objects such as haptic texture and friction. Our haptic-texturing techniques and friction model can add surface details onto convex or concave 3-D polygonal surfaces

Coil sensitivity encoding for fast MRI. In:

by Klaas P Pruessmann , Markus Weiger , Markus B Scheidegger , Peter Boesiger - Proceedings of the ISMRM 6th Annual Meeting, , 1998
"... New theoretical and practical concepts are presented for considerably enhancing the performance of magnetic resonance imaging (MRI) by means of arrays of multiple receiver coils. Sensitivity encoding (SENSE) is based on the fact that receiver sensitivity generally has an encoding effect complementa ..."
Abstract - Cited by 193 (3 self) - Add to MetaCart
complementary to Fourier preparation by linear field gradients. Thus, by using multiple receiver coils in parallel scan time in Fourier imaging can be considerably reduced. The problem of image reconstruction from sensitivity encoded data is formulated in a general fashion and solved for arbitrary coil

Self-determination and persistence in a real-life setting: Toward a motivational model of high school dropout.

by Robert J Vallerand , Michelle S Fbrtier , Frederic Guay - Journal of Personality and Social Psychology, , 1997
"... The purpose of this study was to propose and test a motivational model of high school dropout. The model posits that teachers, parents, and the school administration's behaviors toward students influence students' perceptions of competence and autonomy. The less autonomy supportive the so ..."
Abstract - Cited by 183 (19 self) - Add to MetaCart
revealed a significant main effect for school motivation, F(3.20, 14000) = 895.27, p < .0001. Newman-Keuls post hoc analyses revealed that the seven motivational subscales were significantly different from one another. The most important forms of motivation for participants in this sample were

Behavioral theories and the neurophysiology of reward,

by Wolfram Schultz - Annu. Rev. Psychol. , 2006
"... ■ Abstract The functions of rewards are based primarily on their effects on behavior and are less directly governed by the physics and chemistry of input events as in sensory systems. Therefore, the investigation of neural mechanisms underlying reward functions requires behavioral theories that can ..."
Abstract - Cited by 187 (0 self) - Add to MetaCart
from the primary reward to the CS (Pavlovian response transfer). In instrumental conditioning, a reward can become a goal for instrumental behavior if two conditions are met. The goal needs to be represented at the time the behavior is being prepared and executed. This representation should contain a

Visualization and Haptics For . . .

by Erik Vidholm - ACTA UNIVERSITATIS UPSALIENSIS UPPSALA , 2008
"... Modern medical imaging techniques provide an increasing amount of high-dimensional and high-resolution image data that need to be visualized, analyzed, and interpreted for diagnostic and treatment planning purposes. As a consequence, efficient ways of exploring these images are needed. In order to w ..."
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Modern medical imaging techniques provide an increasing amount of high-dimensional and high-resolution image data that need to be visualized, analyzed, and interpreted for diagnostic and treatment planning purposes. As a consequence, efficient ways of exploring these images are needed. In order

An Architecture For Haptic Control Of Media

by Karon MacLean, Scott S. Snibbe, Robert S. Shaw , 1999
"... Most haptic interfaces are designed with a desire to produce simultaneous perception across multiple senses, with haptic behaviors that complement the task at hand. However, software architectures for haptic interfaces often distribute a virtual model and tasks among multiple processes and CPUs. Thi ..."
Abstract - Cited by 12 (8 self) - Add to MetaCart
. This functional segregation can reduce the quality of haptic experience, by hiding important details of the dynamic model and reducing the communication bandwidth between the haptic controller and the application. We present a means of closely coordinating a haptic interface with a virtual model, application

Efficiency and the bear: short sales and markets around the world

by Arturo Bris, William N. Goetzmann, Ning Zhu - Journal of Finance , 2007
"... Abstract: We analyze cross-sectional and time series information from fortyseven equity markets around the world, to consider whether short–sales restrictions affect the efficiency of the market, and the distributional characteristics of returns to individual stocks and market indices. Using the app ..."
Abstract - Cited by 80 (0 self) - Add to MetaCart
the approach developed in Mørck et al. (2000) we find significantly more crosssectional variation in equity returns in markets where short selling is feasible and practiced, controlling for a host of other factors. This evidence is consistent with more efficient price discovery at the individual security level

Efficient Exploration and Recognition of Convex Objects Based on Haptic Perception

by Stefano Caselli, Corrado Magnanini, Francesco Zanichelli, Enrico Caraffi , 1996
"... The paper describes an efficient technique for recognition of convex objects from tactile sensing. The technique is based on the development of internal and external volumetric approximations of the unknown object, and exploits an effective feature selection strategy along with early pruning of inco ..."
Abstract - Cited by 13 (0 self) - Add to MetaCart
of incompatible objects to improve recognition performance. Exploration strategies conceived for a single-finger probing device rely on the developed volumetric approximations to guide sensing along directions where uncertainty about the explored object is larger, and can take into account exploration costs. 1

Longer-term effects of Head Start

by Eliana Garces , Duncan Thomas , Janet Currie Ucla , Nber - American Economic Review , 2002
"... Abstract Public early intervention programs like Head Start are often justified as investments in children. Yet nothing is known about the long-term effects of Head Start. This paper draws on unique data from the Panel Study of Income Dynamics to provide new evidence on the effects of Head Start on ..."
Abstract - Cited by 131 (5 self) - Add to MetaCart
life event, the more likely it is to be recalled; 6 participation in a Seminal work by Ebbinghaus (1894) and many subsequent studies in the survey research literature have shown that recall error tends to increase as a respondent is asked to stretch further back in time. If recall error seriously
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