摘要:

Within the Division of Medical Electrical Engineering of the Eindhoven University of Technology, a portable microprocessor-controlled actuator for an environmental control system has been developed. It allows severely physically disabled persons to remotely control up to 16 different electrical appliances using only a single switch. The actuator, the‘Monoselector’, actuates the Busch Timac X-10 remote control system. The complete system is very easy to install, transportable, flexible, easy to use and has extensive control possibilities. Since its introduction at the Hannover Trade Fair in 1987 the Monoselector has been commercially available.

ISSN:0309-1902    

DOI:10.3109/03091908909030193

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0309-1902    

DOI:10.3109/03091908909030194

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0309-1902    

DOI:10.3109/03091908909030195

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

This paper deals with the design of systems of sensory substitution of vision in case of blindness. Using the rules of man-machine interactions, one proposes the following optimal design for sensory substitution systems. A model of the visual system might process visual information similarly to its natural counterpart in order to deliver a signal comparable to the one reached in polysensory nervous structures. Then this artificial signal might reach these associative structures through a substitutive sensory system. To achieve this aim, one might model this substitutive system, reverse the information flow, and then trust the natural substitutive system with the stimuli generated by this inverse model. As a result, this artificial system consists of a model of vision connected to an inverse model of the substitutive sensory system. It would first process visual information up to a complex level. Then it would translate this complex signal into coded substitutive stimuli. These stimuli, after processing by the sensory substitutive system, would evoke a vision-like perception.

ISSN:0309-1902    

DOI:10.3109/03091908909030196

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0309-1902    

DOI:10.3109/03091908909030197

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

In addition to retinal magnification, the reading field is an important concept for understanding the influence of the use of hand-held magnifiers on the reading process. Three possible horizontal reading fields can be distinguished: the monocular reading, field; the binocular reading field; and the composite reading field. In order to learn about the strategies that subjects use when reading with the aid of a magnifier, magnifier displacement was measured while subjects read texts under conditions that provided a variety of reading-field widths and text widths. It was found that individual subjects use different strategies (i.e. they use the monocular, binocular or composite reading-field width).In a following experiment for a large number of reading magnifiers the monocular field width was determined. In this experiment subjects were asked to define that part of the reading-field width which is free of aberrations. From these data the optimal width for reading magnifiers with different focal length can be specified.

ISSN:0309-1902    

DOI:10.3109/03091908909030198

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

ISSN:0309-1902    

DOI:10.3109/03091908909030199

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

A brief survey is given on the current development of tactile stimulation systems for profoundly., deaf people. The problems that exist in the current state of the art are analysed, and our philosophy for making a tactile stimulation device is explained. An applied psychophysical study of the tactile sense is in progress, and the preliminary results of an investigation into the ability of the tactile sense to recognize graphic shapes are presented.

ISSN:0309-1902    

DOI:10.3109/03091908909030200

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

An experimental system for a tactile hearing aid using a digital signal processor (DSP) is being developed. This system can be used to test and evaluate not only the familiar techniques for a tactile hearing aid, such as energy level display, filterbank analysis, etc., but also novel techniques. The system is being developed especially to try out new recognition strategies, because the currently available strategies are not satisfactory. A portable tactile hearing aid that can recognize certain environmental sounds (alarm sounds) and certain features from the speech signal (such as pitch, voiced/voiceless, or even complete phonemes), being a good support for lipreading, should be the final result of the experiments.

ISSN:0309-1902    

DOI:10.3109/03091908909030201

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor

摘要:

It has been claimed that computed urea kinetic (UK) modelling in haemodialysed patients for the estimation of protein intake and of the relation between total dialyser urea clearance and distribution volume (Kt/V) leads to an overestimation of protein catabolic rate (PCR). In the present study three different methods of kinetic modelling for the determination of PCR and Kt/V are compared in 15 patients. The first method (MI) is the direct quantification method based on the collection of all urea eliminated from the body. The two other methods are based on an iterative computed calculation. The second method (MII) is the urea kinetic modelling method as described by Sargent. Dialyser clearances were measured directly and not estimated by theoretical extrapolation. The third method described here (MIII), is based on the indirect calculation of urea distribution volume (Vw) according to Watson and of dialyser clearances from this Vwand from pre-and post-dialysis urea concentrations. All three methods result in PCRs that are not significantly different (MI:1·04±0·29; MII:1·07±0.28; MIII:1·05±0·24 mg/kg BW per 24 h; p>0·05). When the results are correlated, the following results are obtained: MIvs MII: r =0·76, p>0·001; MIvs MIII: r = 0·78, p>0·001; MIIvs MIII: r =0·90, p<0·001. For Kt/V virtually identical results were obtained for each of the methods under study. In conclusion, all methods under study seem equally reliable in determining mean PCR. The present data, obtained with directly measured dialyser urea clearances, do not confirm the earlier held opinion that computed modelling results in an Overestimation of PCR.

ISSN:0309-1902    

DOI:10.3109/03091908909030202

出版商:Taylor&Francis    

年代:1989

数据来源: Taylor