Problems

• Nanda: KEEPING TRACK OF THE NUMBER OF ROTATIONS SINCE EACH ONE OF THEM DOESN'T TAKE THE SAME TIME AND WE WERE SUPPOSED TO SEE 5 OF THEM.

• Yaroslav: It is very tough telling from the screen when you reach 5 rotations.

• Yaroslav: Generally it has very hard to get reliable results because to each of us 5 rotations means something else, so if there were more robust ways of telling how much we need to let our model run, it would make results more consistent.

Problems

• Peter: A specific progression of parameter changes will end up with the spiral heading to the wall and dying out.

• Maisum: Once again, the simulation would run off the canvas several times. I found that the problem was worse with the fast computer.

Problems

• Anoopa: Rather than redo all the runs, I would have preferred to spend the day digesting what the data collected the day before meant.

• Rukhinda: The only problem I had was to add my files into dropbox and it took me a lot of time to do that.

• Katarzyna: We always seem to skip or misplace saved results. It's hard to keep track of the data from 3 computers.

Problems

• Maruf: The pc was so slow and i needed to run almost 90 values, I spent the whole day to run a test.

• Anoopa: Figuring out which naming conventions to use, which version of the program to use, how long to run each parameter change and what is expected of graphed data

Results

• Girish: As Gna increases, Ina increases. As Knaca increases, Inaca increases. As Gna increases, the pattern of the path become larger and fatter. Does increase of the current cause a wider spiral wave?

• Anoopa: The spiral became too chaotic when the parameter values were too high- from 140-180, the spiral threatened to go off canvas. The data may not be as reliable as those that didn’t become too chaotic

Results

• Girish: We saw that as you change one particular value and hold the other constant the tip path tends to move based on which one you changed. So If i changed the K1 value to 165% and kept Na at 105% then the graph would move more to the right.

Question: And if you changed in the other order it would move to the left?

Results

• Dan: If the value of Gna is 25%, no matter how big Knaca is, the pattern of the path is very small with a sharp shape. As, Gna increase, the pattern of the path becomes larger and fatter.

• Anoopa: Higher numbers give bigger, chaotic spirals most likely because the waves are sustained by the increase in calcium or sodium

Results

• Yaroslav: I have observed that whenever one parameter was very low and the other parameter was high the trajectory was very small and and symmetric.

Question: Which pair of parameters?

(Opposite) Results?• Rukhinda: Compared to yesterday when we used the

"reset" button for each new value, today we followed the guidelines told by Nancy and did not hit "reset" at all. For my part, I found waves generated in all cases and there was no empty/blank wave at all

• Katarzyna: In a few runs we got the wave disappear from the screen. This wouldn't be so surprising if this happened before, however in the first run (yesterday's run) we didn't get any waves disappearing from the screen. So this makes me wonder which run is more accurate or is this a result of approaching the specific increment from a different parameter.

Results

• Maruf: Some interesting flower pattern.• Rachel: Found some near epicyclic

spirals towards the top of the runs--will try to show these in the slide show

• Mark: The GCal affected how large of an area was traced out by the tip while Gk1 had more of an impact on the shape of the trajectory.

Comments

• Mark: Using the "super-computer" was actually a least favorite part of today. Although runs went by quickly, I often found myself looking away from the computer screen and by the time I returned the tip would have gone through 100 rotations

• Maisam: Peter's programs are very useful. I enjoyed the mini-discussion about problems people were encountering at the beginning of today's workshop

Comments

• Anoopa: I dont know if redoing the data was a good use of time, but could provide an interesting topic for discussion.

• Rukhinda: How do we analyze the wave pattern in a way that relates to atrial fibrilation?