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排序方式: 共有304条查询结果,搜索用时 0 毫秒
1.
方俊芳 《安徽水利水电职业技术学院学报》2010,10(1):71-72,78
一种组合式多功能可移动病床,包括床外框和床芯,它既可以作为固定病床使用,又可以作为推床使用,还可以变换为轮椅使用。 相似文献
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Mirosaw 《Robotics and Autonomous Systems》2009,57(9):889-900
This study addresses the problem of controlling an omni-directional vehicle with both state and control dependent constraints. The task of the vehicle is to attain its desired final position given in the task space. The control constraints resulting from the physical abilities of actuators driving the vehicle wheels are also taken into account during the robot movement. The problem of collision avoidance is solved here based on an exterior penalty function approach which results in smooth vehicle velocities near obstacles. Provided that, a solution to the aforementioned vehicle task exists, the Lyapunov stability theory is used to derive the control scheme. The numerical simulation results carried out for the omni-directional vehicle operating in both a constraint-free task space and task space including obstacles, illustrate the performance of the proposed controllers. 相似文献
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《Behaviour & Information Technology》2012,31(3):187-203
Power wheelchair joysticks have be used to control a mouse cursor on desktop computers, but they offer no integrated text entry solution, confining users to point-and-click or point-and-dwell with on-screen keyboards. On-screen keyboards reduce useful screen real-estate, exacerbating the need for frequent window management, and impose a secondary focus of attention. By contrast, we present two integrated gestural text entry methods designed for use from power wheelchairs: one for use with joysticks and the other for use with touchpads. Both techniques are adaptations of EdgeWrite, originally a stylus-based unistroke method designed for people with tremor. In a preliminary text entry study of 7 power wheelchair users, we found that EdgeWrite with a touchpad was faster than the on-screen keyboard WiViK with a joystick, and EdgeWrite with a joystick was only slightly slower. These results warranted a multi-session comparison of text entry with EdgeWrite and WiViK using joysticks and touchpads, in which we found touchpads faster than joysticks, and EdgeWrite faster than WiViK with both devices after initial learning periods. 相似文献
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在支持向量机多分类方法基础上,提出了一种改进的有向无环图支持向量机( Directed
Acyclic Graph Support Vector Machine,DAGSVM) 手势识别方法。首先根据Kinect 采集到
的场景深度信息将前景和背景分开,分割得到手,然后提取其特征向量,利用特征向量训练多
个SVM 两分类器,采用DAG 拓扑结构构成DAGSVM 多分类器,并对其结构排序进行改进。
实验证明,与其他支持向量机多分类方法相比,改进后的DAGSVM 分类器能够达到更高的识
别率,并将这个手势识别方法用于智能轮椅的控制上,收到了良好的效果。 相似文献
8.
Felipe Espinosa Elena López Raúl Mateos Manuel Mazo Ricardo García 《Autonomous Robots》2001,11(2):137-148
This paper presents the theoretical support and experimental results of the application of advanced and intelligent control techniques to the drive control and trajectory tracking systems on a robotic wheelchair. The adaptive optimal control of the differential drive helps to improve the automatic guidance system's safety and comfort taking into consideration operating conditions such as load and distribution changes or motion actuator limitations. Furthermore, the incorporation of an optimal controller to minimize location errors and a fuzzy controller to adapt the linear velocity to the characteristics of the trajectory, provide the vehicle with a high degree of intelligence and autonomy, even when faced with obstacles. The global control solution implemented increases the features of the wheelchair for handicapped people, especially for those with a high degree of disability. 相似文献
9.
基于分离参数标定的鱼眼镜头成像模型研究 总被引:1,自引:0,他引:1
鱼眼图像具有大视场角,但在应用方面存在严重畸变,为了探索鱼眼镜头的成像规律,本文提出一种基于分离参数标定的鱼眼镜头成像模型研究方法。对相机的物理参数进行分离标定,设计靶标,拟合径向、切向畸变系数,从而得到鱼眼镜头成像模型。比较由成像模型反推出的物点与真实物点的位置,实验结果表明,经本文提出的成像模型得到的成像点与真实物点的入射角和偏移角的误差均值分别为0.011 5和0.019 4。采用基于分离参数标定的鱼眼镜头成像模型研究方法可以较好地反映鱼眼镜头的成像规律,为更广泛地应用鱼眼镜头奠定基础。 相似文献
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