Colloquium- Dr. Brian Hassard
Grading from scanned exams with mark-recognition recorded scores:
4:00PM, Thu Nov 15 2018, Math 250
This talk will discuss scanning and grading exams, as implemented in two
courses Fall 2018.
- the grader works on pdfs, one per problem, and records scores by
marking on a "scoring bar" at the bottom of each page
- in each reassembled exam, images of all scoring bars are copied to the
- a pdf of all front pages (now containing scoring bar images) is written
- mark-recognition converts scoring bar images to numeric scores and a
file with scores for the class is written
- the instructor edits the file of scores while viewing the front page
images to check and possibly correct the scoring
- based on the edited file of scores, versions of the student exams are
created with summary tables of scores stamped on the front pages next to the
scoring bar images and with problem scores stamped on the individual problem pages
Issues encountered and the amount of time involved in each step will be discussed.
Bülent Tosun (Alabama)
Contact surgeries, symplectic fillings and Lagrangian discs
4:00PM, Fri Nov 16 2018, 122 Math
It is well known that all contact 3-manifolds can be obtained from the standard contact structure on the 3-sphere by contact surgery on a Legendrian link. Hence, an interesting and much studied question asks what properties are preserved under various types of contact surgeries. The case for the negative contact surgeries is fairly well understood. In this talk, we will discuss some new results about positive contact surgeries and in particular completely characterize when contact (r)- surgery is symplectically/Stein fillable for r∈(0,1]. This is joint work with James Conway and John Etnyre.
Jacob Russell (CUNY)
4:00PM, Fri Nov 30 2018, 122 Math