An electromagnetic imaging system for remote sign language communication

Author(s):  
S. Dogramadzi ◽  
C.R. Allen ◽  
G.D. Bell ◽  
R. Rowland
Author(s):  
Χρήστος Γεωργοκωστόπουλος ◽  
Μαρία Τζουριάδου

In this study, we investigated the perceptual function of deaf/hard of hearing children. The sample of the study consisted of 58 pupils aged 8-13 years old (3rd-6th graders) with severe (60-90 db) or profound (90 db and above) neurosensory hearing loss – pre-lingual with or without cochlear implants. Children with co-morbidity (intellectual disabilities, syndromes, autism, motor disorders, etc.) and children with post-lingual deafness/hearing impairment were excluded. In order to investigate their perceptual function, the Perceptual Functionality Criterion was used. The results of the study show that deaf/hard of hearing participants exhibit a “sporadic” profile regarding the general perceptual functionality. In particular, the participants were found to perform similarly in terms of visual-perceptive skills, while there was one exception, i.e. their visual-motor skills were worse. Higher scores have been shown in the domain of kinesthetic and tactile perception and lower ones regarding vestigial perception, especially in terms of the sense of balance. In addition, the perceptual function was investigated among the cochlear implant participants and those with conventional hearing aids. The results showed no significant differences between the two groups regarding the perceptual function, although the visual perception was found to be significantly better among the users of conventional hearing aids relative to cochlear implant users. Finally, the perceptual function was investigated in terms of the main method of language/communication used. The data indicated that participants, regardless of whether they use sign language, total/bilingual or oral communication, performed roughly similarly on the test variables. Among the different types of main method of language/communication, statistically significant differences were absent, though regarding the visual and kinesthetic perception sign language users outperformed the users of oral communication.


2020 ◽  
Vol 3 (2) ◽  
pp. 97
Author(s):  
Johana Aprilia ◽  
Frieda Maryam Mangunsong

Children with hearing impairment or deafness experience cognitive function delays but not limited visual-spatial working memory, which is commonly used to solve mathematical problems. Previous studies have discovered that visual or spatial working memory in such children is different because of the communication methods that rely on vision. This study explores the visual-spatial working memory in children with deafness by measuring the memory of 70 elementary school children with deafness and identifying their communication methods through questionnaires. The questionnaires were completed by the children’s parents. The visual-spatial working memory measurement utilized the Lion Game through Zoom meetings. Consequently, it was found that there was no significant difference in visual-spatial working memory capacity in children with hearing impairment using oral, total communication, and sign language. It can be argued that in children with deafness, their visual-spatial working memory span with oral, total, and sign language communication methods have still not reached the maximum point. The use of hearing aids, popular among such children also did not significantly enhance visual-spatial working memory capacity. This research recommends parents be more attentive not only toward the communication methods of children with deafness but also to their cognitive function development. 


Author(s):  
Martha A. Sheridan ◽  
Barbara J. White

Effective social work practice with deaf and hard-of-hearing people requires a unique, and diverse, collection of knowledge, values, skills, and ethical considerations. Salient issues among this population are language, communication, and educational choices, interpreting, assistive devices, cochlear implants, genetics, culture, and access to community resources. Competencies at micro, mezzo, and macro levels with a deaf or hard-of-hearing population include knowledge of the psychosocial and developmental aspects of hearing loss, fluency in the national sign language, and an understanding of deaf cultural values and norms. In the United States, the use of American Sign Language (ASL) is the single most distinguishing factor that identifies deaf people as a linguistic minority group. This entry presents an overview of the practice competencies and intervention approaches that should be considered in working with deaf and hard-of-hearing people, their families, communities, and organizations. It introduces the knowledge base, diversity in community and cultural orientations, social constructions, and international perspectives, current research and best practices, interdisciplinary connections, trends, challenges, and implications for effective social work practice with this population. An integrative strengths-based transactional paradigm is suggested.


Sensors ◽  
2019 ◽  
Vol 19 (20) ◽  
pp. 4469
Author(s):  
Yanju Zhu ◽  
Shuguo Xie

The wideband electromagnetic imaging system using a parabolic reflector is a device for detecting and locating electromagnetic interference sources (EMIS). When multiple coherent interference sources are detected, the confusion will occur due to the coherent noise that is caused by interference phenomenons. Previous works have removed the coherent noise by using iterative techniques, but they face a limitation in removing noise in that the coherent noise pattern changes with frequency in a wideband. In this paper, an adaptive homomorphic filtering is proposed to overcome the limitations of conventional methods from 1 GHz–6 GHz. The coherent noise existing in the several electromagnetic images is studied, and it is confirmed that the variation of the coherent noise pattern is related to the position, the number, and the frequency of EMIS. Then, by analyzing the probability density of coherent noise intensity, an adaptive Gaussian filter is carefully designed to remove coherent noise. The filter parameters are selected by the minimum description length criterion (MDL) to apply to compute directly the local amount of Gaussian smoothing at each pixel of each image. The results of the experiments and simulations demonstrate that the proposed method can significantly improve the quality of electromagnetic images in terms of maximum sidelobe level (MSL) by 15 dB and dynamic range (DR) of the system over 20 dB, compared with conventional narrowband denoising methods.


Author(s):  
Dipali Dhake ◽  
Manisha P. Kamble ◽  
Shrushti S. Kumbhar ◽  
Sana M. Patil

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