Form Discrimination: Features or Invariants?

1988 ◽  
Vol 67 (1) ◽  
pp. 311-317
Author(s):  
G. J. F. Smets ◽  
P. J. Stappers ◽  
B. J. A. Kröse
Keyword(s):  
The Other ◽  
Direct Approach ◽  
Feature Analysis ◽  
Form Discrimination ◽  
Geometrical Properties ◽  
Large Screen ◽  
Direct Theory ◽  
Large Screen Projection

Does form discrimination rely on feature analysis, as the indirect theory of perception supposes, or on affordances (behavioural meanings specified by invariant patterns), as direct theory states. Subjects were to indicate the position of a target in a perspective rendering of a plane, displayed for 100 msec. in a large screen projection. In one of the conditions the target disrupted the plane, in the other it did not. Although targets of the two conditions shared the same features, the disruptive targets were discriminated more often than the nondisruptive targets. This result supports the direct approach to perception which states that a perceiver discriminates behaviourally relevant patterns rather than geometrical properties.

Orosensory Perception, Speech Production, and Deafness

1973 ◽  
Vol 16 (2) ◽  
pp. 257-266 ◽  
Author(s):  
Milo E. Bishop ◽  
Robert L. Ringel ◽  
Arthur S. House
Keyword(s):  
High School ◽  
Speech Production ◽  
Poor Performance ◽  
Normal Hearing ◽  
The Other ◽  
Functional Disorders ◽  
Form Discrimination ◽  
School Subjects ◽  
Oral Form ◽  
Similarities And Differences

The oral form-discrimination abilities of 18 orally educated and oriented deaf high school subjects were determined and compared to those of manually educated and oriented deaf subjects and normal-hearing subjects. The similarities and differences among the responses of the three groups were discussed and then compared to responses elicited from subjects with functional disorders of articulation. In general, the discrimination scores separated the manual deaf from the other two groups, particularly when differences in form shapes were involved in the test. The implications of the results for theories relating orosensory-discrimination abilities are discussed. It is postulated that, while a failure in oroperceptual functioning may lead to disorders of articulation, a failure to use the oral mechanism for speech activities, even in persons with normal orosensory capabilities, may result in poor performance on oroperceptual tasks.

Study of a-Si:H/μc-Si:H Heterojunction as Photosensor for Large Screen Projection Display

1992 ◽  
Vol 258 ◽  
Author(s):  
Weiqiang Han ◽  
Gaorong Han ◽  
Jianmin Qiao ◽  
Pija Du ◽  
Danmei Zhao ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Glow Discharge ◽  
Device Performance ◽  
Blocking Layer ◽  
Large Screen ◽  
Cvd Method ◽  
Projection Display ◽  
Large Screen Projection ◽  
Deposition Conditions ◽  
Structure Properties

ABSTRACTLiquid crystal light valve(LCLV) using an a-Si:H/μc-Si:H heterostructure as the photosensor and the nematic liquid crystal as the modulator has been firstly presented for large screen projection display. The a-Si:H photoconductor and μc-Si:H light blocking layer were prepared by a modified glow discharge CVD method. The optoelectric and structure properties of the μc-Si:H films deposited at different deposition conditions have been studied. The a-Si:H film and the continuously deposited pc-Si:H film possibly form an a-Si:H/μc-Si:H heterojunction. The electrical and optoelectric properties of the heterojunction has been studied.LCLV using a-Si:H/μc-Si:H heterostructure has shown that the most aspects of the device performance can be improved.

A Few Good Men: It’s Not Easy Recruiting Male Hospice Palliative Care Volunteers

2018 ◽  
Vol 35 (12) ◽  
pp. 1532-1539
Author(s):  
Stephen Claxton-Oldfield ◽  
Willa McCaffrey-Noviss ◽  
Robert Hicks
Keyword(s):  
Palliative Care ◽  
Web Site ◽  
Family Members ◽  
The Other ◽  
Direct Approach ◽  
Community Based ◽  
Personal Story ◽  
Male Volunteers ◽  
Hospice Palliative Care ◽  
Different Levels

Two studies were conducted to explore how to engage male volunteers in hospice palliative care. Four male hospice palliative care volunteers were interviewed in study 1. The men agreed that a direct approach is best when it comes to recruiting male volunteers, especially a personal story or testimonial. Two different volunteer position descriptions were created for study 2: one description was similar to what might appear on a community-based hospice palliative care program’s web site or in a newspaper ad looking for visiting hospice palliative care volunteers; the other description was in the form of a personal testimonial ostensibly written by a male hospice palliative care volunteer describing his role through examples of interactions he has had with patients and patients’ family members. Twenty-five males responded to each description. Both of the descriptions generated low and nonsignificantly different levels of interest in becoming a hospice palliative care volunteer. Believing this work to be too emotionally demanding and not having enough time for volunteering were the two most commonly given reasons for not wanting to become a hospice palliative care volunteer. Suggestions for future recruitment efforts are discussed.

Viscous constraints on microorganism approach and interaction

2018 ◽  
Vol 851 ◽  
pp. 715-738 ◽  
Author(s):  
Mehdi Jabbarzadeh ◽  
Henry Chien Fu
Keyword(s):  
Reynolds Number ◽  
Near Field ◽  
Reynolds Numbers ◽  
Suspended Particles ◽  
The Other ◽  
Direct Approach ◽  
Low Reynolds Numbers ◽  
Physical Constraints ◽  
Low Reynolds ◽  
Viscous Hydrodynamics

Microorganisms must approach other suspended organisms or particles in order to interact with them during a host of life processes including feeding and mating. Microorganisms live at low Reynolds number where viscosity dominates and strongly affects the hydrodynamics of swimmer and nearby cells and objects. Viscous hydrodynamics makes it difficult for two surfaces to approach closely at low Reynolds numbers. Nonetheless, it is observed that microorganisms in fluid are still able to approach closely enough to interact with each other or suspended particles. Here, we study how the physical constraints provided by viscous hydrodynamics affects the feasibility of direct approach of flagellated and ciliated microorganisms to targets of different sizes. We find that it is feasible for singly flagellated swimmers to approach targets that are the same size or bigger. On the other hand, for squirmers, the feasibility of approach depends on near-field flows that can be controlled by the details of their swimming strokes.

scholarly journals Comparison of Different Technologies for Soft Robotics Grippers

Sensors ◽  
2021 ◽  
Vol 21 (9) ◽  
pp. 3253
Author(s):  
Silvia Terrile ◽  
Miguel Argüelles ◽  
Antonio Barrientos
Keyword(s):  
Comparative Study ◽  
Environmental Conditions ◽  
The Other ◽  
Soft Robotics ◽  
Geometrical Properties ◽  
Pneumatic Actuation ◽  
Specific Item ◽  
Wide Range ◽  
Soft Objects ◽  
Electromechanical Actuation

Soft grippers have experienced a growing interest due to their considerable flexibility that allows them to grasp a variety of objects, in contrast to hard grippers, which are designed for a specific item. One of their most remarkable characteristics is the ability to manipulate soft objects without damaging them. This, together with their wide range of applications and the use of novels materials and technologies, renders them a very robust device. In this paper, we present a comparison of different technologies for soft robotics grippers. We fabricated and tested four grippers. Two use pneumatic actuation (the gripper with chambered fingers and the jamming gripper), while the other two employ electromechanical actuation (the tendon driver gripper and the gripper with passive structure). For the experiments, a group of twelve objects with different mechanical and geometrical properties have been selected. Furthermore, we analyzed the effect of the environmental conditions on the grippers, by testing each object in three different environments: normal, humid, and dusty. The aim of this comparative study is to show the different performances of different grippers tested under the same conditions. Our findings indicate that we can highlight that the mechanical gripper with a passive structure shows greater robustness.

A pencil of four-nodal plane sextics

1981 ◽  
Vol 89 (3) ◽  
pp. 413-421 ◽  
Author(s):  
W. L. Edge
Keyword(s):  
Symmetric Group ◽  
The Other ◽  
Nodal Plane ◽  
Geometrical Properties ◽  
Index 2

Wiman, in 1895, found ((5), p. 208) an equation for a 4-nodal plane sextic W that admits a group S of 120 Cremona self-transformations; of these, 24 are projectivities, the other 96 quadratic transformations. S is isomorphic to the symmetric group of degree 5 and Wiman emphasizes that S does permute among themselves 5 pencils (4 pencils of lines and 1 of conics) and 5 nets (4 nets of conics and 1 of lines). But he gives no geometrical properties of W. The omission should be repaired because, as will be explained below, W can be uniquely determined by elementary geometrical conditions. Furthermore: W is only one, though admittedly the most interesting, of a whole pencil P of 4-nodal sextics; every member of P is invariant under S+, the icosahedral subgroup of index 2 in S, while the transformations in the coset S/S+ transpose the members of P in pairs save for two that they leave fixed, W being one of these. When the triangle of reference is the diagonal point triangle of the quadrangle of its nodes the form of W is (7.2) below. Wiman referred his curve to a different triangle.

scholarly journals A Besov algebra calculus for generators of operator semigroups and related norm-estimates

2019 ◽  
Author(s):  
Charles Batty ◽  
Alexander Gomilko ◽  
Yuri Tomilov
Keyword(s):  
Banach Spaces ◽  
Hilbert Spaces ◽  
Functional Calculus ◽  
The Other ◽  
Direct Approach ◽  
Operator Semigroups ◽  
Holomorphic Semigroups ◽  
Norm Estimates ◽  
Strict Extension ◽  
Bounded Holomorphic

Abstract We construct a new bounded functional calculus for the generators of bounded semigroups on Hilbert spaces and generators of bounded holomorphic semigroups on Banach spaces. The calculus is a natural (and strict) extension of the classical Hille–Phillips functional calculus, and it is compatible with the other well-known functional calculi. It satisfies the standard properties of functional calculi, provides a unified and direct approach to a number of norm-estimates in the literature, and allows improvements of some of them.

Large-screen projection displays with laser brightness amplifiers

1997 ◽  
Author(s):  
Gueorgii G. Petrash ◽  
Vladimir V. Chvykov ◽  
Konstantin I. Zemskov
Keyword(s):  
Large Screen ◽  
Large Screen Projection
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