oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Pilot study for quantifying driving characteristics during power wheelchair soccer  [PDF]
Amit Kumar, MS, PT,Amol M. Karmarkar, PhD,Diane M. Collins, PhD,Ana Souza, MS, PT
Journal of Rehabilitation Research and Development , 2012,
Abstract: This study determined the driving characteristics of wheelchair users during power wheelchair soccer games. Data for this study were collected at the 28th and 29th National Veterans Wheelchair Games. Nineteen veterans who were 18 years or older and power wheelchair soccer players completed a brief demographic survey and provided information about their power wheelchairs. A customized data-logging device was placed on each participant’s wheelchair before power soccer game participation. The data logger was removed at the end of the final game for each participant. The average distance traveled during the games was 899.5 +/– 592.5 m, and the average maximum continuous distance traveled was 256.0 +/– 209.4 m. The average wheelchair speed was 0.8 +/– 0.2 m/s, and the average duration of driving time was 17.6 +/– 8.3 min. Average proportion of time spent at a speed >1 m/s was 30.7% +/– 33.8%, between 0.5 and 1 m/s was 16.2% +/– 34.4%, and <0.5 m/s was 21.4% +/– 24.3%. The information from this descriptive study provides insight for future research in the field of adapted sports for people with high levels of impairments who use power wheelchairs for their mobility.
Improvement of a Joystick Controller for Electric Wheelchair User  [PDF]
Masatomo Shibata, Chao Zhang, Takakazu Ishimatsu, Motohiro Tanaka, Joel Palomino
Modern Mechanical Engineering (MME) , 2015, DOI: 10.4236/mme.2015.54013
Abstract: The electric wheelchair is an effective machine for people with lower limb disability. The user controls the wheelchair by a joystick that helps the user to navigate the wheelchair along the desired path. Suppose the user on the wheelchair wants to operate the computer for his jobs or enjoyment, it is preferable for the user to be able to operate the computer without transferring from the wheelchair to a computer desk. Of course, some computer input devices are available for wheelchairs. One reasonable idea is to use the familiar joystick on the wheelchair as a computer input device. In this paper a joystick controller is proposed, which enables the user on the wheelchair to operate the computer settled on a nearby table. The proposed joystick controller can be achieved by mounting the sensor unit on the joystick without any modification of the conventional wheelchair controller. The principle of the sensing unit is to measure the inclination angle and the direction of the joystick with an acceleration and gyro sensor. Then the sensing unit sends the control data to the computer via an infrared or wireless signal. This proposal is based on a request done by the wheelchair users.
User evaluation of three wheelchair securement systems in large accessible transit vehicles  [PDF]
Linda van Roosmalen, PhD,Patricia Karg, MS,Douglas Hobson, PhD,Michael Turkovich, MS
Journal of Rehabilitation Research and Development , 2011,
Abstract: Ease of use, comfort, security, and independent use of three types of wheelchair securement systems were evaluated in a large accessible transit vehicle by 20 wheelchair and scooter users. The securement systems included a 4-point tie-down system, a prototype autodocking system, and a prototype rear-facing wheelchair passenger (RF-WP) system. Study participants took a 15-minute city ride and completed a survey. Participants responded positively to the autodocking and RF-WP systems that were quicker and easier to use and allowed more independent use than the 4-point tie-down system (p < 0.001). There was concern regarding the RF-WP system that rear-facing travel made it more difficult to see upcoming stops and was less comfortable than a forward-facing ride and that the system may damage wheelchair wheels during use. The majority of participants preferred using an autodocking system because it allowed secure and independent forward-facing travel. Participants found it undesirable, however, that a wheelchair-mounted docking adaptor was needed to use the autodocking system. Study results indicate a need for improved securement systems for forward-facing use that do not require a wheelchair adaptation and can be easily and independently used by wheelchair and scooter users.
Interface shear and pressure characteristics of wheelchair seat cushions  [PDF]
Jonathan S. Akins,Patricia E. Karg, MS,David M. Brienza, PhD
Journal of Rehabilitation Research and Development , 2011,
Abstract: Pressure ulcer incidence rates have remained constant despite advances in support surface technology. Interface shear stress is recognized as a risk factor for pressure ulcer development and is the focus of many shear reduction technologies incorporated into wheelchair cushions; however, shear reduction has not been quantified in the literature. We evaluated 21 commercial wheelchair seat cushions using a new methodology developed to quantify interface shear stress, interface pressure, and horizontal stiffness. Interface shear stress increased significantly with applied horizontal indenter displacement, while no significant difference was found for interface pressure. Material of construction resulted in significant differences in interface shear stress, interface pressure, and horizontal stiffness. This study shows that the existing International Organization for Standardization (ISO) 16840-2 horizontal stiffness measure provides similar information to the new horizontal stiffness measure. The lack of a relationship between interface shear stress and the overall horizontal stiffness measure, however, suggests that a pressure and shear force sensor should be used with the ISO 16840-2 horizontal stiffness measure to fully quantify a cushion's ability to reduce interface shear stress at the patient's bony prominences.
Personality characteristics of Serbian male wheelchair and professional basketball players [Charakteristika osobnosti srbskych basketbalist -vozí ká a profesionálních basketbalist ]
Kasum Goran,Ljubi?a Lazarevi?,Sa?a Jakovljevi?,Ljubica Ba?anac
Acta Universitatis Palackianae Olomucensis : Gymnica , 2012,
Abstract: BACKGROUND: Sport, as social phenomena, may achieve a very positive influence on health and the social state of people with disability who practice it. In sport activities of athletes with disability, team sports may take a very important place. OBJECTIVE: The aims of this study were: a) to investigate personality characteristics of male professional basketball players and wheelchair basketball players, b) to compare these characteristics of two kinds of athletes. METHODS: For the purposes of this study, professional basketball players (N = 29) and wheelchair basketball players (N = 25) had completed a Cattell 16PF questionnaire which estimated personality characteristics. Differences between two groups of participants were calculated by t-test for small samples. RESULTS: Results demonstrated the existence of differences in the expression of certain forms of behaviour within certain dimensions of personality between these two groups. Wheelchair basketball players had higher scores at factor M – edness (t = -1.889; p = 0.046), which means that they are more preoccupied by themselves and their inner mental life. Wheelchair basketball players had lower scores, on factors: C – Emotional Stability (t = 2.097; p = 0.041), E – Dominance (t = 3.530; p = 0.001), F – Liveliness (t = 2.658; p = 0.010) and N – Privateness (t = 2.527; p = 0.015). CONCLUSIONS: Wheelchair basketball players are, compared with professional basketball players, more emotive; they have a lack of self-esteem, less ready for teamwork and collaboration; they are naive and unpretentious. Considering these results, coaches who are involved in work with wheelchair basketball players have to adjust their methods of trainings, especially those coaches who were working with basketball players without disability. Also, coaches' influence can stimulate eventual changes in some above mentioned characteristics of wheelchair basketball players in more desirable course. [VYCHODISKA: Sport jak sociální fenomén m e mít velmi pozitivní vliv na zdraví a sociální situaci osob s posti ením, které jej provozují. Velmi d le ité místo mezi aktivitami posti enych sportovc mohou zaujímat kolektivní sporty. CíLE: Studie měla tyto cíle – a) pro et it charakteristiku osobnosti profesionálních basketbalist a basketbalist -vozí ká ; b) porovnat tyto charakteristiky dvou druh sportovc . METODIKA: Pro ú ely této studie profesionální basketbalisté (N = 29) a basketbalisté-vozí ká i (N = 25) vyplnili dotazník Cattell 16PF, v něm jsou ohodnoceny charakteristiky osobnosti. Rozdíly mezi oběma skupinami ú astník byly spo
Combination of the DVZ Method, Particle Filter, and Fuzzy Controller for Electric Wheelchair Navigation  [PDF]
Malek Njah,Mohamed Jallouli
International Journal of Navigation and Observation , 2014, DOI: 10.1155/2014/137891
Abstract: Electric wheelchair is one of the many engines used for the movement of aged and disabled people. This paper introduces an obstacle avoidance using deformable virtual zone (DVZ), particle filter to improve localization and fuzzy controller to join desired target. This controller is developed to increase the independence of disabled and aged people, specifically those who suffer not only disability in the lower limbs but also visual disturbances. To overcome these problems, different perceptive abilities or sensors were introduced. In this context, we developed a control system composed by fuzzy controller to join a target, DVZ method for obstacle avoidance, and particle filter for localization. Also, we present the simulation results of the wheelchair navigation system. 1. Introduction Several works have been developed in this context. The publication of Lapierre et al. [1] threatened the DVZ method combined with the path followed, and the work of Gil Pinto et al. [2, 3] provides an active approach to planning based on the DVZ method. This control strategy is based on the GPS sensor and ultrasonic sensors for generating an optimal trajectory to ensure cooperation between nonholonomic robots in an unknown environment. The particulate filter is a probabilistic method allowing the multisensor data fusion and localization. The coordination of these strategies results in an automatic obstacle avoidance navigation to reach a target point [4, 5]. This paper presents control system based on the DVZ method for obstacle avoidance. The principle of this method is to define the robot/environment interaction as a risk zone surrounding the wheelchair (Figure 2). The DVZ characterizes the deformable zone geometry and depends on the wheelchair speed. When the risk zone is disturbed by an obstacle, it can be reformed by modifying the velocities of the wheelchair [1, 6]. In addition we will detail the use of the particle filter method for localization. This method uses a probabilistic approach [4, 7]. It generates a set of possible positions in each sampling period. This data fusion method gives the estimated position of the chair using distance between wheelchair and obstacles. Also, we use a fuzzy controller already developed in previous work that allows the wheelchair to reach the desired position [8, 9]. In the following we will detail the used methods and the simulation of the control system. 2. Using Fuzzy Controller for Electric Wheelchair to Join Target In this paper the fuzzy controller permits reaching the target position from any position . The considered
User Characteristics、User Involvement and Technology Acceptance in Library Automation System Usage  [PDF]
Piching Chu
Journal of Library and Information Studies , 2002,
Abstract: This paper looks into the relationship of user characteristics, user involvement and technology acceptance, also try to find the relationship of the above three variables and library automation system usage. By interview and questionnaire study, the results are described, according to the analysis of the relative literature and the main conclusions, the researcher offers some suggestions for improving the system usage.[Article content in Chinese]
A robotic wheelchair trainer: design overview and a feasibility study
Laura Marchal-Crespo, Jan Furumasu, David J Reinkensmeyer
Journal of NeuroEngineering and Rehabilitation , 2010, DOI: 10.1186/1743-0003-7-40
Abstract: To improve accessibility to training, we developed a robotic wheelchair trainer that steers itself along a course marked by a line on the floor using computer vision, haptically guiding the driver's hand in appropriate steering motions using a force feedback joystick, as the driver tries to catch a mobile robot in a game of "robot tag". This paper provides a detailed design description of the computer vision and control system. In addition, we present data from a pilot study in which we used the chair to teach children without motor impairment aged 4-9 (n = 22) to drive the wheelchair in a single training session, in order to verify that the wheelchair could enable learning by the non-impaired motor system, and to establish normative values of learning rates.Training with haptic guidance from the robotic wheelchair trainer improved the steering ability of children without motor impairment significantly more than training without guidance. We also report the results of a case study with one 8-year-old child with a severe motor impairment due to cerebral palsy, who replicated the single-session training protocol that the non-disabled children participated in. This child also improved steering ability after training with guidance from the joystick by an amount even greater than the children without motor impairment.The system not only provided a safe, fun context for automating driver's training, but also enhanced motor learning by the non-impaired motor system, presumably by demonstrating through intuitive movement and force of the joystick itself exemplary control to follow the course. The case study indicates that a child with a motor system impaired by CP can also gain a short-term benefit from driver's training with haptic guidance.Independent mobility is crucial for children' cognitive, emotional, and psychosocial development [1-5]. Providing a child with self-controlled, powered mobility provides motivation for learning since the chair becomes a tool for explora
Use of manual and powered wheelchair in children with cerebral palsy: a cross-sectional study
Elisabet Rodby-Bousquet, Gunnar H?gglund
BMC Pediatrics , 2010, DOI: 10.1186/1471-2431-10-59
Abstract: A cross-sectional study was performed including all children aged 3-18 years with CP living in southern Sweden during 2008. Data was extracted from a register and health care programme for children with CP (CPUP). There were a total of 562 children (326 boys, 236 girls) in the register. Information on the child's use of manual and powered wheelchair indoors and outdoors and the performance in self-propelling or need for assistance were analysed related to age, CP subtype and gross motor function.Wheelchairs for mobility indoors were used by 165 (29%) of the 562 children; 61 used wheelchair for independent mobility (32 using manual only, 12 powered only, 17 both) and 104 were pushed by an adult. For outdoor mobility wheelchairs were used by 228 children (41%); 66 used a wheelchair for independent mobility (18 using manual only, 36 powered only, 12 both) and 162 were pushed. The use of wheelchair increased with age and was most frequent in the spastic bilateral and dyskinetic subtypes. Most powered wheelchairs were operated by children at GMFCS level IV.In this total population of children with CP, aged 3-18 years, 29% used a wheelchair indoors and 41% outdoors. A majority using manual wheelchairs needed adult assistance (86%) while powered wheelchairs provided independent mobility in most cases (86%). To achieve a high level of independent mobility, both manual and powered wheelchairs should be considered at an early age for children with impaired walking ability.Cerebral palsy (CP) has been defined as a group of permanent disorders of the development of movement and posture, causing activity limitation, that are attributed to non-progressive disturbances that occurred in the developing fetal or infant brain [1]. The severity of impairments varies greatly and the children's mobility ranges from independent walking to totally dependent wheelchair mobility and almost one third is non-ambulant [2].Mobility is important for the cognitive and psychosocial development of c
电动轮椅坐垫舒适性的研究初探
Preliminary Study on Comfortableness of Motorized Wheelchair Cushion
 [PDF]

王殊轶,孙昌英,王秉操
- , 2016, DOI: 10.7507/1001-5515.20160054
Abstract: 本文研究不同蒙皮材质的热舒适性对轮椅坐垫舒适度的影响, 并建立电动轮椅坐垫舒适度数学模型。测量蒙皮材质分别为黑尼龙布、皮革、渔网布的轮椅坐垫与人体接触面的温度、相对湿度及被测试者的坐姿调整时间, 并对轮椅坐垫热舒适性进行主观问卷调查。实验结果表明蒙皮材质为渔网布的坐垫最舒适, 尼龙布的次之, 皮革的最差, 实验得出客观数据分析结果与主观得分具有一致性。本文基于反向传播神经网络(BP神经网络)算法建立了温度、相对湿度与舒适度主观评分之间的数学模型, 可以为轮椅设计及使用者选择轮椅提供客观参考。
This paper aims to explore the thermal feelings of different cover materials effect on wheelchair cushion comfortableness, and to build a mathematical model for motorized wheelchair cushion comfortableness. By measuring temperature and humidity between the contact face of motorized wheelchair cushion and human body as well as the setting posture adjustment time while cushion cover materials are nylon cloth, leather, fishnets cloth. At the same time, each volunteer took a questionnaire about the comfort of different cushion cover materials. Results showed that fishnets cloth was most comfortable, leather was worst, while nylon cloth was in between the two. The experimental objective data were consistent with the subjective data. We built a back propagation (BP) neural network mathematical model for motorized wheelchair cushion comfortableness. This study will provide objective reference to motorized wheelchair for the designers and users.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.