Manufacture is facing more furiously competition in the new century. It tends to be globalized. Rapid response and technology innovation have become the key factor to the success of manufacture enterprise. At present,...Manufacture is facing more furiously competition in the new century. It tends to be globalized. Rapid response and technology innovation have become the key factor to the success of manufacture enterprise. At present, internet-based manufacturing develops rapidly. With the development of engineering material and machining techniques, better cutting properties of metal cutting tools are required. The world is paying more attention to the study of indexable carbide inserts with three-dimensional complex grooves which can affect cutting properties directly and chip-controlling. So the variety and specification of indexable insert develop quickly and the application of insert with three-dimensional complex chip-former becomes wider and wider. Because milling is an interrupted cutting, the process of milling is complicated and the failure of the milling inserts is severe. It is important to choose suitable milling inserts groove for particular machining conditions before actual machining, it will extend tool life and raise productivity. Optimization and choice of inserts with complex groove via internet may serve for manufacture enterprises all over the world. The milling inserts with three-dimensional complex grooves are optimized and chosen via Internet in this paper. The face-milling process is studied, with the mathematics models of cutting force for different shape of cutting edges established, the cutting forces predicted and stress-fields of different insert grooves analyzed by FEM, according to the predictable results and the most suitable insert groove for particular machining conditions are optimized and chosen. The complex groove optimization and choice are based on a client/server model, with the client and server being on different machines across the internet. Communication between the client and server uses the TCP/IP. The result of optimization and choice will be sent to the users via Internet. Manufacturers all over the world can get the desired insert groove without paying for expensive experiments. Thus, the cost and lead time of products are reduced.展开更多
传统的引体向上测试主要通过裁判员进行人工测量计数,依赖裁判员的专业素质和业务能力,主观性较强且评判标准不统一,测试人员较多时会加大裁判员的工作负担,影响测试效率。针对上述问题,将物联网技术和3D体感技术应用于引体向上评测系...传统的引体向上测试主要通过裁判员进行人工测量计数,依赖裁判员的专业素质和业务能力,主观性较强且评判标准不统一,测试人员较多时会加大裁判员的工作负担,影响测试效率。针对上述问题,将物联网技术和3D体感技术应用于引体向上评测系统的设计,采用奥比中光摄像机获得人体实时骨骼图像数据流,通过分析引体向上的状态机,设计多个状态机之间的转换匹配算法,实现对引体向上的运动识别。系统以微软基础类(Microsoft Foundation Classes,MFC)为编程框架开发了上位机,综合引体向上识别和人脸识别功能,并使用网站开发技术将测试人员的个人信息和运动数据显示在Web端。经过多组实验测试和数据分析,系统对引体向上的识别率可以达到98%,能够满足体能训练和运动考核的引体向上测量计数任务需求。展开更多
香港地区中学文凭考试(Hong Kong Diploma of Secondary Education Examination,HKDSE)英语口语公开考试中的小组互动部分受疫情等多种因素的影响而无法正常开展,需要探索其他口试形式。本研究探讨使用基于网络的协作视频会议工具Zoom...香港地区中学文凭考试(Hong Kong Diploma of Secondary Education Examination,HKDSE)英语口语公开考试中的小组互动部分受疫情等多种因素的影响而无法正常开展,需要探索其他口试形式。本研究探讨使用基于网络的协作视频会议工具Zoom进行网考口试(Internet-delivered Speaking Test)的可能性方案。选取40名中学生进行网考口试的试测,由经验丰富的口试考官对考生表现进行评分,并使用基于学习者语料库的方法研究口试考生在话轮转换和语法准确性方面的表现。通过对考生话语的语言分析,以及从考生处和考官处分别收集的反馈结果,证实网考口试是可靠且可行的。展开更多
文摘Manufacture is facing more furiously competition in the new century. It tends to be globalized. Rapid response and technology innovation have become the key factor to the success of manufacture enterprise. At present, internet-based manufacturing develops rapidly. With the development of engineering material and machining techniques, better cutting properties of metal cutting tools are required. The world is paying more attention to the study of indexable carbide inserts with three-dimensional complex grooves which can affect cutting properties directly and chip-controlling. So the variety and specification of indexable insert develop quickly and the application of insert with three-dimensional complex chip-former becomes wider and wider. Because milling is an interrupted cutting, the process of milling is complicated and the failure of the milling inserts is severe. It is important to choose suitable milling inserts groove for particular machining conditions before actual machining, it will extend tool life and raise productivity. Optimization and choice of inserts with complex groove via internet may serve for manufacture enterprises all over the world. The milling inserts with three-dimensional complex grooves are optimized and chosen via Internet in this paper. The face-milling process is studied, with the mathematics models of cutting force for different shape of cutting edges established, the cutting forces predicted and stress-fields of different insert grooves analyzed by FEM, according to the predictable results and the most suitable insert groove for particular machining conditions are optimized and chosen. The complex groove optimization and choice are based on a client/server model, with the client and server being on different machines across the internet. Communication between the client and server uses the TCP/IP. The result of optimization and choice will be sent to the users via Internet. Manufacturers all over the world can get the desired insert groove without paying for expensive experiments. Thus, the cost and lead time of products are reduced.
文摘传统的引体向上测试主要通过裁判员进行人工测量计数,依赖裁判员的专业素质和业务能力,主观性较强且评判标准不统一,测试人员较多时会加大裁判员的工作负担,影响测试效率。针对上述问题,将物联网技术和3D体感技术应用于引体向上评测系统的设计,采用奥比中光摄像机获得人体实时骨骼图像数据流,通过分析引体向上的状态机,设计多个状态机之间的转换匹配算法,实现对引体向上的运动识别。系统以微软基础类(Microsoft Foundation Classes,MFC)为编程框架开发了上位机,综合引体向上识别和人脸识别功能,并使用网站开发技术将测试人员的个人信息和运动数据显示在Web端。经过多组实验测试和数据分析,系统对引体向上的识别率可以达到98%,能够满足体能训练和运动考核的引体向上测量计数任务需求。
文摘香港地区中学文凭考试(Hong Kong Diploma of Secondary Education Examination,HKDSE)英语口语公开考试中的小组互动部分受疫情等多种因素的影响而无法正常开展,需要探索其他口试形式。本研究探讨使用基于网络的协作视频会议工具Zoom进行网考口试(Internet-delivered Speaking Test)的可能性方案。选取40名中学生进行网考口试的试测,由经验丰富的口试考官对考生表现进行评分,并使用基于学习者语料库的方法研究口试考生在话轮转换和语法准确性方面的表现。通过对考生话语的语言分析,以及从考生处和考官处分别收集的反馈结果,证实网考口试是可靠且可行的。
