The Research On Graphic Problem-solving Characteristics Of Different Skilled Numerical Control Learners

At present, the numerical control technology is one of the four big industries in which talent gap is the biggest in our country. Therefore, developing the applied NC technology talented person who has both knowledge and ability is the top priority of higher vocational education. How to convert the two-dimensional drawing into the three-dimensional stereogram, and to process it into the work piece, is one of the important contents which are needed to master for every NC talented person. Based on this, this research mainly analyzes the characteristics in solving graphic problems for NC learners, and then discusses factors that influence NC skill learning, to expect to offer some educational advice to undertake NC skill-based courses in higher vocational colleges.This paper discusses eye movement characteristics when different skilled NC learners deal with the problem of general graphics and professional graphics from the empirical perspective. It includes two parts:The first research which adopts 2(skill levels: high and low) x 2(graphical structures: 2 D and 3D) mixed experimental design of two factors, which the skill levels are variables between the inter group while graphical structures are variables between the intra group, exploring eye movement characteristics when subjects who have different skill levels solve the general graphic problems.The second research which adopts 2(skill levels: high and low) x 2(task difficulty: easy and difficult) mixed experimental design of two factors, which the skill levels are variables between the inter group while task difficulty is a variable between the intra group, exploring eye movement characteristics when subjects who have different skill levels solve the professional graphic problems.According to the analysis and discussion of experimental data, it draws the following conclusions: ①the duration and the times of total fixation in high level subjects are less than those in low level subjects, while the information extraction and the organization ability in high level subjects are stronger than those in low level subjects; ②the average fixation time of high level subjects is shorter than that in low level subjects, while average saccadic distance of high level subjects is less than that in low level subjects, which illustrates that the graphical representation ability of high level subjects is stronger than that of low level subjects; ③the times of blink in high level subjects are less than those in low level subjects, and high level subjects can focus on the task related content, thus the level of self-monitoring skill of high level subjects is higher; ④when the complexity of the graphics problems increases, the subjects will show different eye models. The subjects cope with the complex cognitive processing tasks by increasing the average fixation time and reducing the average saccadic distance; ⑤the eyes scanning path of high level subjects is more effective and they can quickly locate to the key information in the graphics, finding out the answer to the question. The eye movement trajectory of low level subjects is disorderly and they fail to adopt effective eye models.According to the results, this paper puts forward the following suggestions in the aspect of NC professional teaching: ①reducing the reading time to establish a good habit of reading; ②cultivating the habits of graphics scanning to form the correct initial characterization; ③increasing the saccadic distance to improve the breadth of knowledge for graphic reading; ④ developing monitoring skills to improve the efficiency of graphic reading; ⑤strengthening the exchange of learning to improve the ability of graphic representation.