• Journal of rehabilitation welfare engineering & assistive technology
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• v.7 no.2
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• pp.41-46
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• 2013

IIn this paper, active trasfemoral prosthesis leg is designed for the handicapped who lost their legs upon knee. It is important to design proper knee joint to mimic walking motion of hyman. 1 degree-of-freedom active trasfemoral prosthesis leg is designed with knee joint. Operating angle and torque have been calculated using kinematics of three linkages in prosthesis leg. Finite element analysis of major components is performed to evaluate the safety under operating condition and to reduce weights. Minimum volumes of components are obtained by optimization as satisfying safety requirements. The results show that about 35% of weight of components is reduced.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.7 no.2
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• pp.47-54
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• 2013

In this paper, we present an inertial sensor-based motion capturing system to measure and analyze whole body movements. This system implements a wireless AHRS(attitude heading reference system) we developed using a combination of rate gyroscope, accelerometer and magnetometer sensor signals. Several AHRS modules mounted on segments of the patient's body provide the quaternions representing the patient segments's orientation in space. We performed 3D motion capture using the quaternion data calculated. And a method is also proposed for calculating three-dimensional inter-segment joint angle which is an important bio-mechanical measure for a variety of applications related to rehabilitation. To evaluate the performance of our AHRS module, the Vicon motion capture system, which offers millimeter resolution of 3D spatial displacements and orientations, is used as a reference. The evaluation resulted in a RMSE of 2.56 degree. The results suggest that our system will provide an in-depth insight into the effectiveness, appropriate level of care, and feedback of the rehabilitation process by performing real-time limbs or gait analysis during the post-stroke recovery process.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.10 no.2
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• pp.113-118
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• 2016

This study was aimed to analyze the Influence of Reasonable Accommodation on the Employment Probability and Job Retention of the People with disabilities. Survey on the employment discrimination of people with disabilities was utilized. The methodologies used in the study are logistic regression estimating job probability, multiple regression to evaluate job retention. As a result, reasonable accommodation for initial exam was not statistically significant on the employment probability. While, exam process reasonable accommodation was statistically significant on the employment probability. For job retention, recruit accommodation, workplace access accommodation were not significant on the job retention. While, company regulation and job adjustment was statistically significant on the job retention. It is necessary to be provided with reasonable accommodations in the direction of increasing the employment and strengthening job retention of people with disabilities. There is a need to support and expand the reasonable accommodation to the employer by the policy.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.10 no.2
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• pp.119-126
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• 2016

This study aimed to analyze the effects of psychological-social factors, economic factors and Health-related factors of industrially injured workers on life satisfaction. For this study, the data of the 2014 1st Korea Panel Study of work's compensation Insurance. From all the subjects study, 2000 industrially injured workers who were fit for the study purpose were chosen and analysis were implemented. Self efficacy, self esteem, old age preparations of psychological-social factors influenced on life satisfaction. Economic activity, socioeconomic status of economic factors influenced on life satisfaction. Subjective health status, with the help of others of Health-related factors influenced on life satisfaction. The model explained 34% of the valuables.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.10 no.2
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• pp.155-162
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• 2016

The purpose of this study was to determine the walking imbalance using the EMG(electromyogram). To confirm the effectiveness of the proposed encoder and acceleration, EMG sensor based gait imbalance determination system. This experiment was carried out to evaluation with a healthy adult male to 10 people. The Encoder device is attached to the hip and knee joint in order to measure the gait signal. The Accelerometer sensors are attached on the ankle. The EMG sensors are attached on the vastus lateralis and anterior tibialis. SI(Symmetry Index) was used as an index for determining the gait imbalance. To confirm if the judgment has been made correctly, the heel, regarded as the cause of unbalanced ambulation, was adjusted from 0 cm to 6 cm with intervals of 1.5 cm. In the cases of the encoder and the EMG, the difference of 0 cm and 1.5 cm is determined into normal walk but the other difference is distinguished into gait imbalance. In the case of the accelerometer, the difference of 0 cm, 1.5 cm and 3 cm is determined into normal walk but the other difference is distinguished into gait imbalance.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.11 no.1
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• pp.63-71
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• 2017

In this paper, a signal processing circuit for semi-implantable middle ear hearing device is designed using the TCBT which is recently proposed for a new middle ear transducer that can be implanted at round window of cochlea. The designed semi-implantable hearing device transmits digital sound signal from external device located at behind the ear to the internal device implanted under the skin using inductive coupling link methods with high efficiency. The coils and signal processing circuits are designed and implemented considering the total transmission and reception distance including skin thickness of temporal bone for the semi-implantable hearing device. And also, to improve the data transmission efficiency, the output circuits which can supply sufficient signal power is designed. In order to confirm operation of semi-implantable hearing device using inductive coupling link, the circuit analysis was performed using PSpice, and the performance was verified by implementing a signal processing board of an available size.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.11 no.1
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• pp.9-14
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• 2017

Preschool children to do production and acquisition of phonological system from birth to 8 years of age. If a child has hearing loss, he/she has a lot of difficulties to hear sound. The problem of auditory perception can causes limited speech acquisition, delayed language development, and communication disorders. It also affects learning, social and emotional development. Early detection and diagnosis of hearing loss are important for intervention. However, it may be difficult to detect if the degree of hearing loss are slight and/or it appears only on some frequencies. In cases of these kinds of hearing losses, it is often difficult to provide aural intervention. The goal of this study is to discuss the interpretation of audiological evaluation in case of mild-to-moderately severe asymmetric ski-slop sensorineural hearing loss, analyze communication problems, and concerning about audiological, and speech-language pathological rehabilitation.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.11 no.1
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• pp.37-44
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• 2017

This study was to identify the factors influencing the quality of life for the elderly with disabilities in the aging society. For this purpose, this study tried to examine the relationship between the factors which are Social support, Decrease in depression of the elderly with disabilities and Quality of life for the elderly with disabilities, and also identify the moderating effect of living independence. This study tested the research model based on panel data of the elderly with disabilities in Korea Welfare Panel Study. Th result are as follows: First, social support(family support and peer support) positively impact on depression of the elderly with disabilities. Second, decrease in depression of the elderly with disabilities positively impact on the quality of life for the elderly with disabilities. Finally, the higher living independence of the elderly with disabilities, decrease in depression of the elderly with disabilities positively impact on life support services and treatment services whereas does not impact on leisure life significantly.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.11 no.1
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• pp.29-35
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• 2017

It was hard for a conventional care-bed to be realized to a low-floor position due to a complex actuation mechanism installed under the mattress support platform. In this paper a mechanism design to set a low-floor position as well as to adjust back- and leg-rest angles was proposed. A dual motor was applied to the back- and leg-rest mechanism of which design parameters were determined by an optimal method. An elevation mechanism was also designed to enlarge a limited stroke range up to two times of its original stroke using a pulley mechanism. An evaluation test was performed by five healthy subjects ($24.4{\pm}0.5yrs.$) when going up from a floor position to a preset best position which was set to the 240mm height for a prototype low-floor bed and to the 600mm height for a conventional bed. As a result, the moving distance was 38% lower than the conventional bed when the subject used the low-floor bed. It showed that the low-floor care-bed reduced physical burdens and was effective to assist activities of daily living of the elderly people.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.11 no.1
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• pp.21-27
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• 2017

To guarantee the effectiveness of the HACCP(Hazard analysis and critical control points) system, it is necessary to develop of an ontology-based information system that can automatically manage the large amount of HACCP records or information derived from the HACCP operation results. In this paper, we construct a food information ontology which represents the relationships between ingredients, recipe, and features of food categories. Moreover, we develop HACCP automation application adopt the ontology to verify the semantic quality of the designed ontology model by performing HACCP processes such as HACCP diet classification. We expect to contribute to develop a food hygiene information and improve the accuracy of the HACCP data through the semantic system.