• Title/Summary/Keyword: Assistive technology

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sEMG Signal based Gait Phase Recognition Method for Selecting Features and Channels Adaptively (적응적으로 특징과 채널을 선택하는 sEMG 신호기반 보행단계 인식기법)

  • Ryu, J.H.;Kim, D.H.
    • Journal of rehabilitation welfare engineering & assistive technology
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    • v.7 no.2
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    • pp.19-26
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    • 2013
  • This paper propose a surface EMG signal based gait phase recognition method that selects features and channels adaptively. The proposed method can be used to control powered artificial prosthetic for lower limb amputees and can reduce overhead in real-time pattern recognition by selecting adaptive channels and features in an embedded device. The method can enhance the classification accuracy by adaptively selecting channels and features based on sensitivity and specificity of each subject because EMG signal patterns may vary according to subject's locomotion convention. In the experiments, we found that the muscles with highest recognition rate are different between human subjects. The results also show that the average accuracy of the proposed method is about 91% whereas those of existing methods using all channels and/or features is about 50%. Therefore we assure that sEMG signal based gait phase recognition using small number of adaptive muscles and corresponding features can be applied to control powered artificial prosthetic for lower limb amputees.

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Design and Implementation of Mobiel Terminal with Multi Bio-signal Measurement for u-Healthcare System (u-헬스케어 시스템에서 멀티 생체신호 측정 무선 단말기 설계 및 구현)

  • Jang, M.S.;Eom, S.H.;Kim, P.S.;Lee, E.H.
    • Journal of rehabilitation welfare engineering & assistive technology
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    • v.7 no.2
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    • pp.27-34
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    • 2013
  • Most of existing biomedical signal measurement devices measure and evaluate biomedical signal only in a single device. Also, even if the device is multi-functional, those biomedical signals can be measured by selection of the user. In this paper, we implemented wristband-style biomedical signal measurement device for u-healthcare system to solve the problem above. Implemented device uses 4 infrared sensors to measure the pulse, 2 electrodes to measure the skin conductivity, and 3-axis accelerometer to measure momentum. Also, we propose a communication packet frame for transmitting biomedical signal data to PC or mobile device, using Zigbee. Studies show that our device has the error rate of less than twice for pulse measurement, 85.6%, 84.7% reliability for momentum measurement, and the skin conductivity has changed according to the user's physical status.

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Design and Optimization Study of Active Trasfemoral Prosthesis leg (대퇴 절단 환자를 위한 능동대퇴의지구조 설계 및 최적화 연구)

  • Lee, K.H.;Chung, J.H.;Lee, C.-H.
    • 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.

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Implementation of Motion Analysis System based on Inertial Measurement Units for Rehabilitation Purposes (재활훈련을 위한 관성센서 기반 동작 분석 시스템 구현)

  • Kang, S.I.;Cho, J.S.;Lim, D.H.;Lee, J.S.;Kim, I.Y.
    • 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.

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A Study on the Influence of Reasonable Accommodation on the Employment Probability and Job Retention of the People with Disabilities (정당한 편의(Reasonable Accommodation)가 장애인의 취업확률 및 직업유지에 미치는 영향)

  • Jun, Young Hwan
    • 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.

A Study on the Factors Influencing on Life Satisfaction of Industrially Injured Workers (산업재해 근로자의 생활만족도에 미치는 영향 요인에 관한 연구)

  • Ahn, Seong Ah;Yeum, Dong Moon
    • 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.

A Study of Gait Imbalance Determination System based on Encoder, Accelerometer and EMG sensors (인코더, 가속도, 근전도 센서 기반의 보행불균형 판단 시스템 연구)

  • Park, Yong-Deok;Kim, Sang-Kyun;Kwon, Jang-Woo;Lee, Sang-Min
    • 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.

Design of Signal Processing Circuit for Semi-implantable Middle Ear Hearing Device with Bellows Transducer (벨로즈형 진동체를 갖는 반이식형 인공중이용 신호처리회로 설계)

  • Kim, Jong Hoon;Shin, Dong Ho;Seong, Ki Woong;Cho, Jin-Ho
    • 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.

A Case of Interpretation for Audiological Evaluation in Preschool Child with Mild-to-Moderately Severe Asymmetric Ski-Slop Sensorineural Hearing Loss (학령 전기 경도 및 중등고도 대칭성 고음급추형 감각신경성 난청의 청각학적 평가 해석 증례)

  • Kim, Na-Yeon;So, Won-Seop;Ha, Ji-Wan;Heo, Seung-Deok
    • 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.

Factors Influencing the Quality of Life for the Elderly with Disabilities in the Aging Society (고령화 사회에서 장애 노인의 삶의 질에 영향을 미치는 요인)

  • Kim, Mi-Ae;Park, Hee-Joon;Suh, Chang-Kyo
    • 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.