Design Of Automatic Evaluation System For Teaching Platform Of Traffic Organization In Marshalling Station

In recent years,China’s railway has developed rapidly,especially in terms of technology integration,speed and operation scale,and has taken the lead in the world.The high-speed railway has become a business card of China,with broad prospects for development.With the development of China’s railway,the demand for railway professionals is increasing.To transport a lot of railway talents for China,many transportation colleges have opened railway-related courses and built many virtual simulation experimental platforms.While implementing teaching,it is necessary to evaluate students’ knowledge mastery.With the expansion of the enrollment scale,teachers’ work tasks are increasing,classroom assessment work is time-consuming and labor-intensive,and it is difficult to grasp the degree of students’ knowledge mastery.To comprehensively,objectively,and fairly evaluate students’ knowledge mastery,this thesis designs an automatic evaluation system for train organization teaching platform of marshalling station.The main work of this thesis includes the following four parts:(1)A word semantic similarity calculation method based on Cilin and How Net is proposed,which expands the range of the computable words.The Pearson coefficient of0.944 is obtained on the MC30 dataset.Based on the word semantic similarity calculation method,an automatic scoring method for subjective questions is designed by constructing the railroad domain dictionary and railroad domain Cilin and using Chinese word segmentation,part-of-speech tagging,keyword extraction,and other technologies.Single-process mode and multi-process mode are designed for the automatic scoring system of subjective questions,which can be selected according to the actual situation.(2)A flowchart-based scoring method for practical operation questions is proposed,which can manually set parameters such as steps,arrow weights,and step scores in the standard operation flowchart according to the actual situation.The method is improved according to the actual situation to make it more suitable for scoring operation questions in the railroad field.This paper designs an immediate scoring mode and a unified scoring mode for the scoring system of practical questions,which can be flexibly adjusted according to the actual situation.(3)This thesis participated in the construction of the train organization teaching platform of marshalling station,completed the design of the basic functions of the platform(notice announcement,message management,experimental management,performance management),the station dispatching system and the station monitoring module,and designed the online examination system,the client software of the subjective automatic scoring system and the client software of the practical operation scoring system.(4)The experimental results show that the average deviation rate of subjective automatic scoring results and manual scoring results is 5.459 %.When the amount of data is large,the multi-process mode of the subjective automatic scoring system can effectively shorten the automatic scoring time,and the automatic scoring time is inversely proportional to the number of available threads.This thesis contains 65 figures,21 tables and 61 references.