Classifying latent profiles of adolescents’ use of daily time and testing the effect of influence factors and differences in virtual reality orientation

In the case that a real operator drives a virtual human in real-time using the motion capture method and performs complex products assembling and disassembling simulation, a very high driven accuracy is needed to meet the quality requirements of interactivity and simulation results. In order to improve the driven accuracy in virtual reality environment, a method is put forward which analyzes the influence factors of virtual human real-time driven accuracy and optimize the factors. A systematical analysis of factors affecting the accuracy is given. The factors can be sorted into hardware factors and software factors. We find out that the software factors are the main ones affecting the accuracy, and it is very hard to analyse their influence separately. Therefore, we take the virtual human kinematic system as a fuzzy system and improve the real-time driven accuracy using an optimization method. Firstly, a real-time driven model is built on dynamic constraints and body joint rotation information and supports personalized human driven. Secondly, a function is established to describe the driven error during interactive operations in the virtual environment. Then, based on the principle of minimum cumulative error, we establish an optimization model with a specified optimization zone and constraints set according to the standard Chinese adult dimensions. Next, the model is solved using genetic algorithm to get the best virtual human segment dimensions matching the real operator. Lastly, the method is verified with an example of auto engine virtual assembly. The result shows that the method can improve the driven accuracy effectively.

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Virtual Reality Orientation Game for Alzheimer’s Disease Using Real-Time Help System

Brain Function Assessment in Learning - Lecture Notes in Computer Science ◽

10.1007/978-3-030-60735-7_2 ◽

2020 ◽

pp. 13-23

Author(s):

Manish Kumar Jha ◽

Hamdi Ben Abdessalem ◽

Marwa Boukadida ◽

Alexie Byrns ◽

Marc Cuesta ◽

...

Keyword(s):

Alzheimer’S Disease ◽

Alzheimer's Disease ◽

Virtual Reality ◽

Real Time ◽

Reality Orientation ◽

Help System

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Influence Factors and Life Satisfaction of Types of Older Adults’ Daily Time Use Using Latent Profile Analysis

Innovation in Aging ◽

10.1093/geroni/igaa057.1607 ◽

2020 ◽

Vol 4 (Supplement_1) ◽

pp. 497-498

Author(s):

Joosuk Chae ◽

Seok In Nam ◽

Haesol Won ◽

Juyoung Lee

Keyword(s):

Older Adults ◽

Life Satisfaction ◽

Chronic Disease ◽

Time Use ◽

Latent Profile Analysis ◽

Profile Analysis ◽

Influence Factors ◽

Work Status ◽

Daily Time ◽

Significant Factors

Abstract The purpose of this study is to divide the daily time use of older adults into types, examine the influence factors of each type, and verify the difference in life satisfaction between types. We used a total of six variables, three variables (essential, compulsory, and leisure time use) for weekdays and the same three variables for weekends. We used data from the sixth wave of the Korea Retirement and Income Study (n=3,993). Latent Profile Analysis was used to classify the older adults’ (aged 65 and over) types of daily time use, resulting in a division into three types: essential activity-centered (16%), leisure-centered (26%), and balanced (58%). The weekend and weekday activities of each group did not differ. Compared with the balanced type, the significant factors of the essential activity-centered type were age (p<.01), work status (p<.001), and chronic disease (p<.001). In addition, the significant factors of the leisure-centered type were age (p<.05), gender (p<.05), subjective health (p<.001), work status (p<.001), and chronic disease (p<.001). Life satisfaction was lowest in the essential activity-centered type and highest in the balanced type; differences between the groups were identified (p<.000). Based on the results, we discuss practical interventions and the development of psychosocial programs for older adults. For the essential activity-centered type, living support is required because they spend more time sleeping and eating. In addition, we proposed the preparation of leisure programs applicable to the needs of older adults’ of the leisure-centered type, since their life satisfaction was lower than the balanced type.

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A Virtual Reality Orientation and Mobility Test for Inherited Retinal Degenerations: Testing a Proof-of-Concept After Gene Therapy

Clinical Ophthalmology ◽

10.2147/opth.s292527 ◽

2021 ◽

Vol Volume 15 ◽

pp. 939-952

Author(s):

Tomas S Aleman ◽

Alexander J Miller ◽

Katherine H Maguire ◽

Elena M Aleman ◽

Leona W Serrano ◽

...

Keyword(s):

Gene Therapy ◽

Virtual Reality ◽

Proof Of Concept ◽

Retinal Degenerations ◽

Mobility Test ◽

Orientation And Mobility ◽

Reality Orientation

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Detection of neuronal response in a new mechatronics equipment with virtual reality images

Electroencephalography and Clinical Neurophysiology ◽

10.1016/s0013-4694(97)89078-9 ◽

1997 ◽

Vol 103 (1) ◽

pp. 223

Author(s):

A Rovetta

Keyword(s):

Virtual Reality ◽

Neuronal Response

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Top-Down Processing and Visual Reorientation Illusions in a Virtual Reality Environment

Swiss Journal of Psychology ◽

10.1024/1421-0185.63.3.143 ◽

2004 ◽

Vol 63 (3) ◽

pp. 143-149 ◽

Cited By ~ 3

Author(s):

Fred W. Mast ◽

Charles M. Oman

Keyword(s):

Virtual Reality ◽

Visual Processing ◽

Line Length ◽

Perceptual Cues ◽

Virtual Reality Environment ◽

Top Down ◽

Test Conditions ◽

The Subject ◽

Processing Mechanisms

The role of top-down processing on the horizontal-vertical line length illusion was examined by means of an ambiguous room with dual visual verticals. In one of the test conditions, the subjects were cued to one of the two verticals and were instructed to cognitively reassign the apparent vertical to the cued orientation. When they have mentally adjusted their perception, two lines in a plus sign configuration appeared and the subjects had to evaluate which line was longer. The results showed that the line length appeared longer when it was aligned with the direction of the vertical currently perceived by the subject. This study provides a demonstration that top-down processing influences lower level visual processing mechanisms. In another test condition, the subjects had all perceptual cues available and the influence was even stronger.

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Laparoscopic Cholecystectomy

Swiss Surgery ◽

10.1024/1023-9332.8.6.250 ◽

2002 ◽

Vol 8 (6) ◽

pp. 250-254

Author(s):

Vogelbach ◽

Bogdan ◽

Rosenthal ◽

Pfefferkorn ◽

Triponez

Keyword(s):

Virtual Reality ◽

Laparoscopic Cholecystectomy ◽

Neue Technik

Fragestellung: Die dieser Untersuchung zugrunde liegende Frage war, ob das angewandte Ausbildungskonzept geeignet war, um am Beispiel der Einführung der laparoskopischen Cholezystektomie eine neue Operationsmethode in einer universitären Ausbildungsklinik mit einer grossen Anzahl Chirurgen zu etablieren. Patienten und Methodik: Seit Einführung der ersten laparoskopischen Cholezystektomie wurden alle Cholezystektomien während zwei Jahren (Mai 1990 bis Mai 1992) prospektiv erfasst. Ein Ausbildungskonzept wurde gewählt, bei dem jeweils ein Operateur durch einen Tutor geschult wurde und so 15 konsekutive Eingriffe durchführte, um dann die Technik einem weiteren auszubildenden Chirurgen zu instruieren. Resultate: In zwei Jahren wurden 355 Patienten cholezystektomiert. 60% der Operationen wurden laparoskopisch durchgeführt oder begonnen. 40% der Operationen wurden offen durchgeführt. In den ersten zwei Jahren konnten 13 Operateure (durchschnittlich 16 Operationen / Operateur , range 1 - 60) in die neue Technik eingeführt werden. Es traten keine schweren Komplikationen, insbesondere keine Gallenwegsverletzungen in dieser Einführungsphase auf. Diskussion: In der Literatur wird dieses Vorgehen bei der Einführungsphase seit 1992 wiederholt vorgestellt, diskutiert und empfohlen. Zwischenzeitlich gibt es Richtlinien von Fachgesellschaften und nationalen Institutionen, welche die Ausbildung zur Ausführung neuer chirurgischer Techniken reglementieren. In den letzten Jahren verlagern sich die ersten Ausbildungsschritte in Richtung Trainingskurse an skill-stations und virtual reality Trainer. Schlussfolgerung: Das beschriebene Ausbildungskonzept bewährte sich in der Einführungsphase der laparoskopischen Cholezystektomie zu Beginn der 90er-Jahre.

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