The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Jorge Angeles - One of the best experts on this subject based on the ideXlab platform.
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Experimental Validation of an Underactuated Two-Wheeled Mobile Robot
IEEE ASME Transactions on Mechatronics, 2009Co-Authors: Patrick Oryschuk, Alessio Salerno, Abdul M. Al-husseini, Jorge AngelesAbstract:Reported in this paper are the implementation and testing of the real-time control of a two-wheeled mobile robot. The robot is underactuated, its mobility and control inputs being three and two, respectively. The control challenge faced here is to reduce the oscillations of the intermediate body while following a desired path. A controller, introduced elsewhere, is implemented using a real-time operating system on a novel control architecture. The control algorithm was tested using three different test motions: translational, rotational, and uphill.
John Golias - One of the best experts on this subject based on the ideXlab platform.
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intelligent transportation systems and powered two wheelers traffic
IEEE Transactions on Intelligent Transportation Systems, 2016Co-Authors: Emmanouil N Barmpounakis, Eleni I Vlahogianni, John GoliasAbstract:Recently, a growing rate in powered two wheelers (PTWs) penetration to urban road networks has been observed with significant effects on traffic conditions. However, this increase is not consistent with either the research on the subject or the implementation of intelligent transportation systems (ITS) dedicated to congestion relief. First, we review the PTW research conducted with respect to the modeling parameters, data issues, and their effect on a multimodal environment. Then, a concise review on ITS services and applications emphasizing on cooperative driving for solving macroscopic traffic problems is conducted, followed by a PTW-oriented ITS review. Findings reveal that PTW-oriented ITS are mainly safety oriented, whereas similar systems for solving traffic issues have not yet been proposed. Other interesting aspects of PTW traffic integration to ITS are also discussed, such as the data acquisition and the manner new technologies may support the development of PTW-dedicated ITS research and applications for macroscopic traffic improvements through the optimization of vehicles' microscopic interactions.
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driver age and vehicle engine size effects on fault and severity in young motorcyclists accidents
Accident Analysis & Prevention, 2005Co-Authors: George Yannis, John Golias, Eleonora PapadimitriouAbstract:This paper reports a study of the combined effect of driver age and engine size on accident severity and at-fault risk of young riders of Two-Wheelers. Data from the national accident database of Greece are used to calculate accident severity and relative fault risk rates. The induced exposure technique is applied due to the lack of exposure data. A log-linear analysis is then used to examine first- and second-order effects within three-variable groups. Accident severity modelling revealed a significant second-order interaction between severity, driver age and Two-Wheeler engine size. On the contrary, no second-order effects were identified in fault risk modelling. Moreover, a significant effect of driver age on accident fault risk was identified. The effect of engine size was not significant.
Anne D Kloos - One of the best experts on this subject based on the ideXlab platform.
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assistive devices alter gait patterns in parkinson disease advantages of the four wheeled walker
Gait & Posture, 2013Co-Authors: Deb A Kegelmeyer, Sowmya Parthasarathy, Sandra K Kostyk, Susan White, Anne D KloosAbstract:Gait abnormalities are a hallmark of Parkinson's disease (PD) and contribute to fall risk. Therapy and exercise are often encouraged to increase mobility and decrease falls. As disease symptoms progress, assistive devices are often prescribed. There are no guidelines for choosing appropriate ambulatory devices. This unique study systematically examined the impact of a broad range of assistive devices on gait measures during walking in both a straight path and around obstacles in individuals with PD. Quantitative gait measures, including velocity, stride length, percent swing and double support time, and coefficients of variation were assessed in 27 individuals with PD with or without one of six different devices including canes, standard and wheeled walkers (two, four or U-Step). Data were collected using the GAITRite and on a figure-of-eight course. All devices, with the exception of four-wheeled and U-Step walkers significantly decreased gait velocity. The four-wheeled walker resulted in less variability in gait measures and had less impact on spontaneous unassisted gait patterns. The U-Step walker exhibited the highest variability across all parameters followed by the two-wheeled and standard walkers. Higher variability has been correlated with increased falls. Though subjects performed better on a figure-of-eight course using either the four-wheeled or the U-Step walker, the four-wheeled walker resulted in the most consistent improvement in overall gait variables. Laser light use on a U-Step walker did not improve gait measures or safety in figure-of-eight compared to other devices. Of the devices tested, the four-wheeled-walker offered the most consistent advantages for improving mobility and safety.
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Gait measures across all walking conditions: mean, (standard deviation).
2013Co-Authors: Anne D Kloos, Deb A Kegelmeyer, Susan E. White, Sandra K KostykAbstract:Abbreviations: no AD, no assistive device; StW, standard walker; 2WW, two wheeled walker; 3WW, three wheeled walker; 4WW, four wheeled walker; CV, Coefficient of Variation;*significantly different than no AD at p
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Coefficient of Variation of Gait measures across all walking conditions: mean, (standard deviation).
2013Co-Authors: Anne D Kloos, Deb A Kegelmeyer, Susan E. White, Sandra K KostykAbstract:Abbreviations: no AD, no assistive device; StW, standard walker; 2WW, two wheeled walker; 3WW, three wheeled walker; 4WW, four wheeled walker; CV, Coefficient of Variation;*significantly different than no AD at p
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Footfall Patterns.
2013Co-Authors: Anne D Kloos, Deb A Kegelmeyer, Susan E. White, Sandra K KostykAbstract:Footfall pattern recordings in one individual with HD under five conditions (A) no assistive device and using a (B) cane, (C) standard walker, (D) two-wheeled walker or (E) four-wheeled walker. The four-wheeled walker (E) produced a gait pattern with the least variability.
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Gait Parameters.
2013Co-Authors: Anne D Kloos, Deb A Kegelmeyer, Susan E. White, Sandra K KostykAbstract:Comparison of gait parameters: (A) velocity, (B) stride length, (C) percent time in swing, and (D) percent time in double support with standard deviation across 6 walking conditions: no AD, no assistive device; StW, standard walker; 2WW, two-wheeled walker; 3WW, three-wheeled walker; 4WW, four-wheeled walker. * * significantly different than no AD at p
L Jiang - One of the best experts on this subject based on the ideXlab platform.
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two wheeled mobile robot motion control in dynamic environments
Robotics and Computer-integrated Manufacturing, 2010Co-Authors: Mingcong Deng, A Inoue, K Sekiguchi, L JiangAbstract:In this paper, a feedback control scheme of a two-wheeled mobile robot is explored in dynamic environments. In the existence of local minima, the design of controller is based on Lyapunov function candidate and considers virtual forces information including detouring force. Simulation results are presented to show the effectiveness of the proposed control scheme.
Sandra K Kostyk - One of the best experts on this subject based on the ideXlab platform.
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assistive devices alter gait patterns in parkinson disease advantages of the four wheeled walker
Gait & Posture, 2013Co-Authors: Deb A Kegelmeyer, Sowmya Parthasarathy, Sandra K Kostyk, Susan White, Anne D KloosAbstract:Gait abnormalities are a hallmark of Parkinson's disease (PD) and contribute to fall risk. Therapy and exercise are often encouraged to increase mobility and decrease falls. As disease symptoms progress, assistive devices are often prescribed. There are no guidelines for choosing appropriate ambulatory devices. This unique study systematically examined the impact of a broad range of assistive devices on gait measures during walking in both a straight path and around obstacles in individuals with PD. Quantitative gait measures, including velocity, stride length, percent swing and double support time, and coefficients of variation were assessed in 27 individuals with PD with or without one of six different devices including canes, standard and wheeled walkers (two, four or U-Step). Data were collected using the GAITRite and on a figure-of-eight course. All devices, with the exception of four-wheeled and U-Step walkers significantly decreased gait velocity. The four-wheeled walker resulted in less variability in gait measures and had less impact on spontaneous unassisted gait patterns. The U-Step walker exhibited the highest variability across all parameters followed by the two-wheeled and standard walkers. Higher variability has been correlated with increased falls. Though subjects performed better on a figure-of-eight course using either the four-wheeled or the U-Step walker, the four-wheeled walker resulted in the most consistent improvement in overall gait variables. Laser light use on a U-Step walker did not improve gait measures or safety in figure-of-eight compared to other devices. Of the devices tested, the four-wheeled-walker offered the most consistent advantages for improving mobility and safety.
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Gait measures across all walking conditions: mean, (standard deviation).
2013Co-Authors: Anne D Kloos, Deb A Kegelmeyer, Susan E. White, Sandra K KostykAbstract:Abbreviations: no AD, no assistive device; StW, standard walker; 2WW, two wheeled walker; 3WW, three wheeled walker; 4WW, four wheeled walker; CV, Coefficient of Variation;*significantly different than no AD at p
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Coefficient of Variation of Gait measures across all walking conditions: mean, (standard deviation).
2013Co-Authors: Anne D Kloos, Deb A Kegelmeyer, Susan E. White, Sandra K KostykAbstract:Abbreviations: no AD, no assistive device; StW, standard walker; 2WW, two wheeled walker; 3WW, three wheeled walker; 4WW, four wheeled walker; CV, Coefficient of Variation;*significantly different than no AD at p
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Footfall Patterns.
2013Co-Authors: Anne D Kloos, Deb A Kegelmeyer, Susan E. White, Sandra K KostykAbstract:Footfall pattern recordings in one individual with HD under five conditions (A) no assistive device and using a (B) cane, (C) standard walker, (D) two-wheeled walker or (E) four-wheeled walker. The four-wheeled walker (E) produced a gait pattern with the least variability.
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Gait Parameters.
2013Co-Authors: Anne D Kloos, Deb A Kegelmeyer, Susan E. White, Sandra K KostykAbstract:Comparison of gait parameters: (A) velocity, (B) stride length, (C) percent time in swing, and (D) percent time in double support with standard deviation across 6 walking conditions: no AD, no assistive device; StW, standard walker; 2WW, two-wheeled walker; 3WW, three-wheeled walker; 4WW, four-wheeled walker. * * significantly different than no AD at p
