This study proposed a novel hybrid dynamic balancer and vibration absorber that is cheaper than active dampers and more effective than passive dampers. The proposed damping system does not need to be altered structurally to deal with different damping targets. Rather, the proposed vibration absorber is capable of self-adjustment to the optimal damping location in order to achieve balance and, thereby, optimize damping effects. The proposed device includes a groove under the damping target with inertial mass hung from a coil spring beneath. This allows the device to bounce vertically or rotate in order to reduce vibrations in the main body. The coil spring vibration absorber can also slide along the groove in order to adjust its location continuously until the vibrations in the system are minimized and the main body is balanced. Experiments verify the efficacy of the proposed device in improving damping performance beyond what has been achieved using conventional devices. We also provide an explanation of the theoretical underpinnings of the design as well as the implications of these findings with regard to future developments.
In this paper, a circle object recognition method based on monocular vision for the home security robots is proposed. This vision system is able to process image and recognize a colored ball rapidly. The proposed method consists of two submodules, which are the object segmentation module and the circle detection module. In order to implement the object segmentation, the color feature is applied to find out the region of the object. After the region of the object is determined, a fast randomized circle detection method is used by checks if there have enough number radius which are the same in a circle in the region. Because of the double recognition, this system can improve the precision for detecting a colored ball. The proposed method is tested on a home security robot to find a ball. The experimental results illustrate the effectiveness of the proposed method.
The purpose of this study was to focus on the survey of the prevalence rate of dental trauma for Taiwanese children aged below six years. A total sample of 4,620 children was collected by stratified cluster sample design, and Probability Proportion to Size. The sample examined was 4,037 children and the completion rate was 87.38%. Training for the oral examination was provided to improve the coordination and reliability of the examiners to enhance consistency. A database was designed by Microsoft Access and data analyzed by statistics software SAS and JMP after data entry. Comparison between categorical variables was performed by using Pearson's chi-square test and between numerical variables by using t-test analysis. The prevalence rate of dental trauma to deciduous teeth for the 0-6 year-ld children was 0.94%, boys had 1.12% and girls 0.68% prevalence rate of dental trauma. There was no significant difference between boys and girls in dental trauma prevalence. The prevalence rate of dental trauma by age showed that the highest peak occurred at 3 years old (1.19%), followed by 4 (0.95%) and then 5 year-old (0.92%) children. In our study, upper central incisors occupied 0.99% prevalence of dental trauma among primary dentition. Upper lateral incisors and lower central incisors only occupied a very small prevalence rate, less than 0.05%. A low prevalence rate of dental trauma occurred to the children aged below 6 years in Taiwan, which may be caused by different study and sampling method, different definition of dental trauma, and different care attitude of parents to children. Considering the high frequency of dental trauma in the 3-5 year-old children, the safety of kindergartens and the prevention of dental trauma to deciduous teeth should be considered.
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