http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Active Contact Flange를 이용한 표면 가공 작업 도구 힘 제어에 관한 연구
윤진수(J. S. Yun),박용수(Y. S. Park),곽경신(K. S. Kwak),김성탁(S. T. Kim),박서준(S. J. Park),양순용(S. Y. Yang),안경관(K. K. Ahn),박진상 유공압건설기계학회 2020 유공압건설기계학회 학술대회논문집 Vol.2020 No.7
Active Contact Flange (Active Contact Flange) is a device installed between the robot arm end effector and the robot arm to maintain a constant force between the workpiece and the tool. ACF is able to maintain a constant force in the surface machining operation, which gives positive results for control. In the existing surface processing automation operation, the force and the position are controlled simultaneously, so performance degradation is predicted. In this paper, we propose an ACF device that can control unstable forces separately. ACF can be expected to have more positive effects in terms of economy, efficiency, and environment compared to hydraulic cylinders using hydraulic oil. Since there is non-linearity in the air, this paper controls the force using a suitable sliding mode control. In the case of the existing PID controller, it is simple and has excellent performance, but it is difficult to control the uncertainty of the disturbance due to the fixed gain. Therefore, the sliding mode controller was applied to increase the control performance of uncertainty in disturbance, and force control was performed. As a result, force control was implemented without using a servovalve, and it was confirmed that it is possible to maintain contact force for surface processing.
한국농수산대학 졸업생 영농정착 성공 사례집의 Text Mining - 주요단어의 빈도 분석 및 word cloud -
주진수,김종숙,박석영,송천영,Joo, J.S.,Kim, J.S.,Park, S.Y.,Song, C.Y. 국립한국농수산대학교 교육개발센터 2018 현장농업연구지 = Journal of practical agricultural resear Vol.20 No.2
In order to extract meaningful information from the excellent farming settlement cases of young farmers published by KNCAF, we studied the key words with text mining and created a word cloud for visualization. First, in the text mining results for the entire sample, the words 'CEO', 'corporate executive', 'think', 'self', 'start', 'mind', and 'effort' are the words with high frequency among the top 50 core words. Their ability to think, judge and push ahead with themselves is a result of showing that they have ability of to be managers or managers. And it is a expression of how they manages to achieve their dream without giving up their dream. The high frequency of words such as "father" and "parent" is due to the high ratio of parents' cooperation and succession. Also 'KNCAF', 'university', 'graduation' and 'study' are the results of their high educational awareness, and 'organic farming' and 'eco-friendly' are the result of the interest in eco-friendly agriculture. In addition, words related to the 6th industry such as 'sales' and 'experience' represent their efforts to revitalize farming and fishing villages. Meanwhile, 'internet', 'blog', 'online', 'SNS', 'ICT', 'composite' and 'smart' were not included in the top 50. However, the fact that these words were extracted without omission shows that young farmers are increasingly interested in the scientificization and high-tech of agriculture and fisheries Next, as a result of grouping the top 50 key words by crop, the words 'facilities' in livestock, vegetables and aquatic crops, the words 'equipment' and 'machine' in food crops were extracted as main words. 'Eco-friendly' and 'organic' appeared in vegetable crops and food crops, and 'organic' appeared in fruit crops. The 'worm' of eco-friendly farming method appeared in the food crops, and the 'certification', which means excellent agricultural and marine products, appeared only in the fishery crops. 'Production', which is related to '6th industry', appeared in all crops, 'processing' and 'distribution' appeared in the fruit crops, and 'experience' appeared in the vegetable crops, food crops and fruit crops. To visualize the extracted words by text mining, we created a word cloud with the entire samples and each crop sample. As a result, we were able to judge the meaning of excellent practices, which are unstructured text, by character size.