• Physical Therapy Rehabilitation Science
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• v.8 no.2
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• pp.79-85
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• 2019

Objective: The purpose of this study was to investigate the relationship between physical features, strength, function, and upper extremity musculoskeletal pain during rehabilitation of manual wheelchair users with spinal cord injuries. Design: Cross-sectional study. Methods: The degree and frequency of upper extremity musculoskeletal pain were measured in persons with spinal cord injuries using manual wheelchairs with the use of questionnaires. The pain scores of the hand, wrist, and shoulder joints were calculated by multiplying the seriousness and frequency of pain. We collected data on the manual muscle test, Spinal Cord Independent Measure-III, and the Body Mass Index. Statistical analysis was performed by descriptive analysis and Pearson's correlation analysis. Results: A total of 47 patients participated in this study and the neurological level of the injuries ranged from C2 to S5. Pain in the shoulder joints was the most common in persons with tetraplegia and paraplegia. Pain was experienced as mild to moderate, and occurred one or more times a week. Of the 32 persons with paraplegia, the most common area of complaint was the shoulder. Of the 15 persons with paraplegia, the shoulder joints were the most common site of pain. The independence levels of the persons with spinal cord injuries were highly correlated to muscle strength levels (p<0.05). Conclusions: This study investigated upper extremity musculoskeletal pain during rehabilitation of manual wheelchair users with spinal cord injuries and the relationship between physical features, strength, and function. In most persons with spinal cord injuries, pain and frequency of shoulder joints were high and pain levels were also related to functional levels.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.1495-1499
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• 2003

There is some equipment that helps user to exercise and to walk. But almost all equipments require some physical strength of their muscles. So we developed a system that could assist walking action of the people with lower-limb disability. The system called as walking stand adopted the balancing mechanism which assures the stable walking, and the 4 link-based mechanism that had 2 degrees of freedom on each leg. The walking stand uses four motors and has two sets of the special link-structure to simulate the human walking mechanism. With our system, even serious disabled with lower-limb disability may enjoy walking rehabilitation. And by adjusting the power, it can be used as the walking assistant mechanism instead of conventional wheelchairs. Experiments showed that our walking stand is applicable to the rehabilitation and also to the mobile device in our daily life for those people who do not have enough physical ability to walk by themselves.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.8
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• pp.3360-3365
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• 2011

This paper deals with method to measure the user's driving-will force and to control the power-assisted wheelchair. To solve this problem, we extract the user's driving-will by using the mathematical motor model. And then, we get the linear and angular velocity at the center of the vehicle. Wheel velocities are also measured from center velocity. Finally, power-assisted electric wheelchairs are controlled by these data. Here all processes are verified by simulation.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1976_1977
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• 2009

The number and percentage of people in need of a wheelchair are increasing every year, both manual and power wheelchair users express an interest in monitoring their weight. However, frequent measurements are not possible when relying on hospital scales and models designed for home use are expensive. So the goals of this study became to create a product that's relatively inexpensive, portable, and precise, which means varying little between measurements. Secondary goals were ease of use, compatibility with different kinds of wheelchairs, and accuracy, which means achieving proximity to an actual value and isn't as important when trying to monitor increases or decreases in weight.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.23 no.57
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• pp.77-85
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• 2000

The purpose of this study is to analyze problems of KS measurement of the wheelchair and a pair of crutches and to propose proper measurements of the wheelchair and a pair of crutches for the posteriori handicapped. Research method is as following ; First, it is compared that Anthropometry of Korean and Japanese adults relevance with design measurement of the wheelchair and a pair of crutches. Second, we compared measurements of KS wheelchairs with measurements of the wheelchair manufactured by the T aids company and the D aids company, and then compared and analyzed differences of measurements about each part of the wheelchair. Third, we compared measurements of a pair of crutches of an fixed and an elastic type with anthropometry and analysis. The result, measurements of KS wheelchair and KS a pair of crutches shows unsuitable to Korean adults. It may cause handicapped. We proposed measurements of the aids(the wheelchair and a pair of crutches) proper to the handicapped of Korean adults with improvement of these problems.

• International Journal of Precision Engineering and Manufacturing
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• v.7 no.3
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• pp.66-71
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• 2006

Some wheelchair users with neuromuscular disorders experience involuntary extensor thrusts, which may cause injuries via impact with the wheelchair, cause the user to slide out of the wheelchair seat, and damage the wheelchair. Knowledge of the human-generated forces during an extensor thrust is of great importance in devising safer, more comfortable wheelchairs. This paper presents an efficient method for identifying human-generated forces during an extensor thrust. We used an inverse dynamic approach with a three-link human body model and a system for measuring human body motion. We developed an experimental system that determines the angular motion of each human body segment and the force at the footrest, which was used to overcome the mathematical indeterminacy of the problem. The proposed method was validated experimentally, illustrating the force-identification process during an extensor thrust.

• Proceedings of the KSR Conference
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• 2001.10a
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• pp.416-421
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• 2001

The subway station platform is designed in high platform for quick getting in/out which is against ordinary train platform. Out of 370 Metropolitan subway station platforms, subway stations which have cured platform are about 38％. In these cases, as the distance between subway and platform would become longer, handicapped people's wheelchairs, baby carriers and old and feeble people can feel uncomfortable when they are getting in and out Also, passengers often fall into track because of the height difference between high platform and track. And if passengers go down on track to pick up something fallen, they sometime fail to climb up and happen to hit against subway. To solve out these kind of inconveniences and prevent accidents, we have developed subway station high platform safety system and finished tests. This safety system is consisted of safety block, screened door and safety wall. This study explained the composition and function of this system and presented the test result to identify its performance.

• Proceedings of the KIEE Conference
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• 1988.07a
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• pp.723-726
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• 1988

This paper is a study about the automatic control of wheelchairs. This is realized by joystick, and is simulated by voice signal recognition. The control system by joystick is designed as follows: joystick paddle is connected with a timer and this timer ouput is high only when the joystick is moved. A computer reads the duration of this high state, and ouputs motor control word decided from this value using look-up table. The control system by voice signal is designed as follows: partial autocorrelation coefficients are computed from A/D converted signals and these values are compared with referance patterns. From this, the motor control word is decided on by the neareast neighbor rule.

• Journal of the Korea Safety Management & Science
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• v.13 no.2
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• pp.211-217
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• 2011

The government has been operating the long-term care insurance since 2008. In June 2010, the government manual wheelchairs, electric beds, manual beds, mattresses prevent pressure ulcers, mobile tub, bath lifts, including six items were changed to rental-only item. For the successful settlement of welfare equipment rental system, The efforts to prevent inconvenience of welfare equipment user's and improvement of the system for the activation is needed. The main object of this study is to identify the factors affecting satisfaction of welfare equipment rental and seek to proposals of revitalizing equipment rental system.

• Proceedings of the KIEE Conference
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• summer
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• pp.908-910
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• 2004

Disabled people have benefited greatly from the developments in technology over the last twenty years. Systems have been developed and refined to help them overcome, or cope with, difficulties they experience as a result of their disabilities. As technology has become cheaper, more powerful and easier to use, disabled people have taken to using them to an ever increasing degree. In this paper, we propose novel hybrid mobility devices which use a combination of human power and electric power. This paper deals with the design of a direct-drive wheel Axial-flux permanent magnet motor. This type motor prove to be the best candidate for application in electric vehicles, as in comparison with conventional motors they allow design with higher compactness, lightness. A prototype vehicle for an application as a hybrid wheelchair is designed, built, and tested.