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October 2005 – Stephen Skory

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Month: October 2005

Comparison Photos

Comparison Photos

Continuing on my previous post I'm posting some more photos with my new camera. This time I've made some 4-up comparison JPGs showing my new SLR versus my old pocket digital.


The main point of the comparison photos is to see how the range of lenses compare. I've scaled down the SLR's photos and cut the aspect ratio of the Canon's shots, so image quality is not the main focus of this comparison. I also didn't play with the advanced features of the SLR because the Canon doesn't have the range of variability like the SLR. But I did take photos in two different modes just to see if I could discern any changes.

Overall the lens supplied with the SLR has about the same range as the Canon, while the telephoto lens & 1.4x multiplier attachment goes where the Canon can't. I took the photos on a partly-cloudy day so the ambient light changed between various shots, which diminishes the comparison value of color & exposure. One thing that is clear is the Canon suffers from the usual problem of depth of field. Even when I'm taking a photo of something close, the background tends to be in focus. In the above photo you can see that the Canon does have the background out of focus somewhat, but not nearly as much as the SLR.

One thing the Canon has going for it is portability, so I don't think I'll be abandoning it yet. It still takes great snapshots, and sometimes all I want is a snapshot.

New Digital SLR!

New Digital SLR!

My father gave me for my birthday a shiny new digital SLR. It's a Konica Minolta Maxxum 5D digital SLR. I already own a Minolta 35mm film camera, so I have a few lenses and accessories that are compatible with the new camera.

I'm still playing around with all the fancy features, and I really don't know how to use it to it's full potential now.

My Research

My Research

For the better part of half a year now I've been working slowly on a project with Mike Norman, my advisor. I'm basically implementing a test of the efficiency & accuracy of the cosmological simulation code his group uses. I do this by sticking a ring of gas into the simulator and watching the gas spread out. I compare the computer simulation to how it should go if all things were perfect (which the simulation is not). The two plots below are a culmination of my accelerating efforts.

Above is a 3D plot of the gas density. The two horizontal coordinates are the x-y position, while the vertical gives the density at that point. I'm doing my simulation in two dimensions right now, eventually I'll go to three.

The white line above (hidden by the red line) is a sideways slice of the density, starting at the center going out. The red line is a best curve fit of the white line. The curve fit is very good because the white line was generated by the same function I'm using for the best fit, but the picture shows my fitting technique works, and that's what matters.

I hope to make further, faster progress! I'll post things here as I go along.

Cycling Track Nats Addendum

Cycling Track Nats Addendum

A few more things to add to my post from yesterday about Track Nationals.

Here are some photos I took at Nationals that I posted on the UCSD Cycling website. Photos on the Velodromes website and photos another rider took which are actually very decent and have a surprisingly large number of photos of UCSD. I don't actually know who took them, but thank you! (Update: They were taken by Steve McFarland of Tufts.)

Choice quotes from the weekend:

"Are you too good for your home?" - A slightly delirious Ashley trying to fit her rollers in a bag.

"I don't wanna be a cowboy." - Stephen before both points races (copying Joe Merlone, who probably copied it from someone else).

"Awesome!" - What Ashley yelled at me almost every lap of the points race final.

I'll edit this entry when I think of more...

Track Nationals

Track Nationals

I just returned from Chicago where I participated in my first national-level cycling competition. It was the 2005 NCCA Championships held at the Northbrook Velodrome (Google Maps), in Northbrook, a leafy suburb Northwest of Chicago. I participated as member of the UCSD Cycling Team.

My goals for the event were fairly modest because of my relative lack of track racing experience. My two individual events were the 3 kilometer pursuit and the points race. The 3k pursuit is a time trial, from a standing start. Alone you try to ride the distance as fast as possible. It's comparable to running a mile in terms of duration. If you go too fast in the beginning you'll be suffering at the end. It's about metering out your effort such that just as you cross the finish line you are at your breaking point. Two weeks ago I raced in San Jose and did a 4:06 pursuit, so my goal at nationals was to simply get below 4 minutes.

The points race is something like a criterium on the road, but usually much more brutal. Every five laps there is a sprint, and only the first four riders across the finish line get points. The field size is usually over 20 so obviously people go very fast for sprints. Each sprint, including the final, is worth the same points: 5,3,2 and 1 point(s) for first, second, third and fourth. The rider with the most points at the end wins. I have raced a bunch of points races this summer locally, and it was my best event, so I was looking forward to it.

I also raced in two team events, the Italian Pursuit and the Team Pursuit. The Team Pursuit is a four man, 4 kilometer race to the fastest time. Each rider takes turns at the front where riding is most difficult. The other three sit in the draft and work significantly less hard. Time is taken when the third man crosses the finish line, meaning only one of the riders can drop out of the race (usually because of exhaustion).

The Italian Pursuit is an interesting race because it's the only race with both genders. There is a minimum of three riders and a maximum of six. One rider has to be female and there can be no more than four males. Each rider leads the group for a lap, or two, and then leaves the race. The next teammate then does the wind-cutting duties until they leave. Time is taken when the last rider crosses the line for six laps. And a woman has to lead for two of those six laps (but it doesn't have to be the same woman). You can see that if a team has less than six riders, someone is going to go for two laps.

The team had a goal of reaching the podium on team rankings, meaning top five of all the teams. The way team rankings work is every race gives team points to each team based on how well their member raced. All the races and all the team points are added up together and the team omnium is decided. We wanted to be one of the five best teams. The team events I outlined in the previous paragraph are very important in the team omnium.

The racing was held for three days, September 29 to October 1, with a morning session at 9 am and an evening session at 6 pm both days. But you need to realize that for each session racers need to show up at least an hour before the start and often leave half an hour after the end of each session. I & my team were getting up at six each morning and retiring after 11 pm, which makes for very long days.

Did I meet my goals? I think I did. I raced a 3:59.4 pursuit. Of course I had aero wheels & an aero helmet, unlike in San Jose, which certainly helped. But it was still me pushing the pedals so I was happy. That time put me in 20th place (out of ~40 riders), which is the lowest place that gives team points, and that is what I was hoping for.

The points races were on the final day. Because so many men signed up for the points race, there were two qualifying races in the morning, and the best 13 of each would advance to the final in the evening. By the third day of racing I had developed a sore throat and persistent congestion, making everything unhappy. Leading up to the qualifying race I was very anxious about my ability to race in my condition, but I raced anyway.

The qualifying race was 45 laps, or about 17 kilometers (on a 383 meter track). Let me point out that the longest points race I had ever done up to that point was 45 laps here in San Diego, on a 333 meter track, or 15 kilometers. Luckily for me, despite my condition, I was still able to read a race. I guessed that the large rider in front of me (~6' 4") was about to make a dash for the sprint with about a lap and a half to go. Thinking that such a big guy makes a nice draft, I grabbed his wheel (figuratively), and sure enough, he went. After he pulled me around for a lap I went around him and ended up taking third on that sprint. It turned out that those two points were enough to advance me into the final.

The final was 75 laps, or nearly 29 kilometers. After racing the longest points race of my life in the morning, I raced one 77% longer 10 hours later. At this rate I'll be doing double century points races. Ouch.

Because I knew that with my sickness I was under full strength, my goal for the points race was to not get dropped and sprint for high placing in the final sprint. The finishing order in a points race is ranked by those who have points first, and then by finishing order. I knew that if I went for points during the race I would get dropped after the huge effort, so I had to save up for the end and get ahead of other guys without sprint points.

My plan worked pretty well because I got lucky, twice. With four laps to go a rider crashed in front of me. He was sliding from my left to my right with one foot still attached to his bike, and his bike was in front of him in the slide (imagine the bike is dragging him by his right foot up the banking of the track). In the microseconds I had to make a choice I aimed for that leg thinking it would be a better target than his body or his bike. Just as I was about to hit his ankle his foot separated from his bike and I went right between. The officials shot the gun twice to halt the race while the crashers were taken off the track, and during the lull in action I advanced about 20 places in the pack and settled in at about 6th or 7th place. When racing resumed I just had to hold on for four laps and sprint hard for the line, where I eventually placed 20th after the orderings were worked out.

If you had asked me the morning of the points races if I would even advance to the final, I would have been doubtful. I'm happy I pushed through my discomfort and did respectably. Now I want to come back and do the race healthy. I think I could do some damage if I was healthy!

The Italian Pursuit was a very successful race for our team. The way qualifying works in this event is the teams race in the morning alone for a qualifying time. Then, the two fastest teams face each other on the track at the same time in the evening for the gold and silver medal, and the 3rd and 4th for bronze. All the teams 5th and lower in qualifying are given that place in the final rankings. This means often your hardest effort is in the qualifying because you are guaranteed certain placing after that. We rode a very good race and qualified second.

In the final we raced a very skilled team from Penn State, which had no fewer than three 'ringers,' people I who I consider more bike racer than college student. Two of them only register in the fall to race at collegiate nationals. One of them I know for a fact spent most of last year in Australia racing, which is a goodly distance from Pennsylvania. This is to basically point out that we knew we had no chance of beating Penn State in the final, so we didn't race quite as hard as the qualifying race. Additionally, one of our members, Tona, was doing other races during the same session, so we wanted to keep him from over exerting himself. But we were very happy with second, especially because everyone on our team earned the second place.

The Mens Team Pursuit had a similar qualifying system, and we qualified fifth. We raced a very good, disciplined race - something I'm proud of. Looking back I think we could have gone a bit faster and qualified fourth (0.6 seconds away), and that's something to remember next time we do that race. Qualifying fifth was a good and a bad thing. It was good because it meant we didn't have to race again (this was the same day as the points races), but it was bad because fifth isn't nearly as nice as fourth. We were in a tight battle for second place in the team omnium with Marian College and every little placing mattered.

Speaking of the team omnium, we ended up the weekend in third place overall, behind Penn State and Marian College. After Penn State, we had the most talented riders. Marian had over twice as many racers as UCSD, but beat us 800 points to our 792, a 1% difference. Marian also has cycling scholarships and a velodrome on their campus. They beat us with quantity over quality. This was the first year for UCSD going to Track Nats as a team, and we really made an impression around the country (well, to those who pay attention to Collegiate Track Cycling).

It was a grand adventure and really taught me about how hard I can push myself. Now I want more!