Citation
Valentine, Stephanie, et al. "Mechanix: a sketch-based tutoring and grading system for free-body diagrams." AI Magazine 34.1 (2012): 55.
Summary
The paper introduces a tool named Mechanix which is used for teaching courses which require sketch based assignments. When number of students is very large, it becomes difficult for the instructor to review and grade individual's assignments. Also the final result doesn't really show if the student went through the right steps to come with the outcome. Mechanix provides instructors to create questions and expected sketched solution. Primary focus is drawing Truss and applying Forces and reaction forces at different points. From the students's sketch, first Truss is detected and forces are matched at different nodes. Then the student's response with instructor's expected solution using Hausdorff Distance, Modified Hausdorff Distance and Tanimoto Coefficient. Student's are also provided by a creative response if their response is wrong at certain step. Student has to go through all the required steps to complete the question.
Discussion
First the sketch is segmented into line segments. Then two nodes with shared edge and two paths between them are considered as Truss. To detect this Breadth First Search is used to first find the shortest path, and then if there exists any other path between the two nodes, that implies Truss is detected.
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