In this paper, according to the randomness of students ’ arrival in the canteen and the randomness of dining time, a queuing model of canteen service is established. The students ’ arrival rate and service time are randomly simulated, and the students ’ multi-queue dining service is dynamically simulated. So got the queuing time, busy rate of dining windows and other factors. Considering the waiting cost of students and the operating cost of canteen, and effectively combining the epidemic prevention, the optimal number of canteen windows is obtained. It puts forward the optimization scheme for students to eat, and provides feasible suggestions for canteen managers and schools.

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Objective: The cotton textile industry, as a competitive industry in China's international competition, is confronting new opportunities and challenges brought by the growing process of mechatronics. To further improve the traditional drive control of combing machines made in China and the automatic level of machines as a whole, some of our cotton textile enterprises have undertaken necessary technical transformations on the combing machines so as to raise the operational efficiency and production technology of domestic textile equipments. Methods: This paper focuses on the basic status and dynamic characteristics of the drive part of the domestic new comber, and analyzes the operation process of the comber and the prominent problems from the production practice. Results: The technically improved drive control system uses an industrial control computer (IPC) as the core of the system, which effectively improves the overall working efficiency of the comber, and improves the production accuracy and production efficiency. Conclusion: The combers that are textile machinery equipments with comprehensive application of machines, electricity, gases and instruments, play a vital role in enhancing product quality and production efficiency. Highly intelligent and integrated process control, real-time monitoring and accurate data acquisition and data analysis have become the mainstreams in the development of auto-control. Therefore, the commitment of high technology to transform the traditional production mode has also been an important research.