Category Archives: OldBlog

Endings

At the beginning of the semester, I wrote up my expectations for classes, so I would actually have them at the end of the semester to compare. The semester is over, so now it’s time to compare.

* Digital Controls (EE572) /Walcott
Expected: Its going to be hard. Its going to be a lot of work. Its going to teach me a whole new model for thinking about things, and make me actually learn the signals material I half-learned in Signals and Systems (EE421). Every expectation that it will be a good course.
Actual: I’m actually a little disappointed. I didn’t feel like I had the prerequisite knowledge for the class, and spent the whole semester struggling to catch up. Also, everything was abstract enough that it would be difficult to apply to the kinds of situations I wanted it for. I should have bailed to the applied controls class, the people who went that way showed me what they did and it was more applicable (and easier). Oh well, this was reasonably interesting anyway, and it’s good to stretch ones self.
* Solid State Electronics (EE661)/Hastings
Expected: The graduate version of EE360 “Introduction To Semiconductor Devices”, which I didn’t really feel like I absorbed as well as I should have. I’ve heard good things about the class and good things about Dr. Hastings’ handling, so I have high hopes.
Actual: I pretty much guessed right, I actually understand semiconductors reasonably well now. It’s a shame they try to sterilize the quantum mechanics out of the undergrad version, this are actually easier with limited portion of quantum than trying to hand-wave around it. It would have been nice if it got a little more into fabrication, but there isn’t time, and my interest is mostly because the way UK’s fabrication class is taught doesn’t appeal to me (boo industry focus).
* Introduction to Cognitive Science (CS585/CGS500) /Goldsmith
Expected: Definitely going to be a fun course. Lectures are going to be scattered, and the material may not be of much utility, but it will definitely be interesting and fun, and shouldn’t be too time consuming. Looking forward to being able to do some non-technical writing again.
Actual: Called this one pretty well too, it was really fun, Dr. Goldsmith is a VERY interesting and well connected person. I got play with things I can’t usually justify spending time on, and accelerated the expansion of my ever-growing reading list. I’d recommend this class to just about anyone reasonably smart and interesting.

In another ending, the assured broadcast run of Dollhouse also ended Friday. It was not a satisfying ending, but it was a perfectly good plot development episode. I’m sadly not hopeful that FOX will continue it. Maybe we’ll get a movie like last time this happened (to make the disclaimer I always feel the need to put on such comparisons, Dollhouse is no Firefly, but if you aren’t judging it against Firefly it’s a perfectly good show).

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Overcommitment…

Is a state of being and a way of life. Better to be interesting than sane, right?
I may have done myself in this time though, I don’t think I can get an honest feedback-employing controller running on my XY Table by Friday… but I can probably get something that sufficiently resembles one to get away with it. Again.

As far as the specific case of burying myself for fun, I designed and understand an algorithm, I’m just finding myself unable to implement it in a timely manner; I haven’t worked with an ATMega chip’s timers in too long. I know what I need is to run my pair of 8bit timer/counters so that the full 255 count is 2kHz (1uS high, 1uS low, 50% duty cycle square wave) set the output compare registers so it actually runs at about 1500Hz (toggle and reset on match), and use the (scaled) difference in the output pulse train and the pulses from the encoders to adjust the output compare registers up/down to accommodate missed steps. I’m just being dumb with BOTH the encoders and the timers, so it doesn’t work.

EDIT: Toggle at TWICE the desired output frequency, not half. Dumb.

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Passing Obsessions

I INTENSELY wanted to hear female-voice country/pop this weekend while studying. I’m not really sure why, I’ve been noticing that I did in fact grow up in the south lately, and it’s clearly a related phenomenon, but I only have nebulous suspicions as to what triggered it. Therefore, a playlist full of The Wreckers and Taylor Swift to assuage the urge. I need to go out and talk to (flirt with) a “Look at me, I’m a peach” sort of girl to remind me how irritating they are so I can put an end to this.

In a related note, listen to the melody of “Tears on my Guitar” (current single) then the melody of “Dear Lie” (single about a decade ago)… recycling plastics is good for the environment, what is recycling pop hooks good for? I’m pretty sure the same hook is in something else that was on the radio, maybe one of SR71’s singles?

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Stepper Drivers

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I got a set of RepRap Stepper Driver v.2.3 kits to use for my CNC project, and was having no end of trouble with them, but finally had a breakthrough that has two of the three working…and one definitely, definitely dead; the magic smoke escaped from #3. The trick: the SOIC packages were ever so slightly bent in shipping, and I was a little too conservative in the application of solder paste, so some of the contacts around the IC were intermittent. After I finally found it, which was a little difficult because the pressure of a test probe temporarily fixed the problem, all that was needed was punching down a couple pins with a hot soldering iron. With two boards working I’m now in business to finish off the XY table.

Because I’m getting proud of it, a picture of the framing and drive for the XY table in the state it was in the other night.
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All it (just for the table) really needs mechanically now are the bolts attaching the lower lead nut assembly to the middle crossbar, and the table itself to be attached to the rails and lead nut assembly on top (need to pick up some short flathead screws to countersink in for that). To be safe it should probably also have the bearing assembly/leadscrew protector/encoder mount tubes installed where the floating brass nuts are in that picture.
The workspaces in both images are noticeably horribly, horribly messy; both pictures were taken at the end of a couple hours of work, right before cleanup. I (unsurprisingly) tend to keep my workspaces compulsively clean.

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Culture Experiment

Last night I had the sudden realization that I had NO IDEA what the US Top 40 chart looked like, so I went and found a listing. Turns out I only recognized 5 tracks out of the 40. I then proceeded to ask around; of the 6 quick responses I got, individuals recognized an average of 4.5 tracks, with a spread from 0 to 11. Either I know very cultured people, or the Internet really is making radio irrelevant. Or some partial mixture thereof. I’d be curious how other people do.
The second part of the experiment was trying to listen through the whole list. It really is godawful, I ended up stopping over half the tracks before they finished because I just couldn’t stand it, and I only made it to about #30 before I gave up. Perhaps my generation is becoming old. Damn kids, get off my lawn?

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Civil Disobedience Kickball

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Some guys in Lexington arranged for a Kickball game in the centerpointe unsightly hole earlier today. This is a very cool idea for voicing public displeasure at the empty hole in our downtown, and there was a pretty good turnout.
The organizers however made one fatal mistake; they announced the event on facebook. All the cool kids may be on facebook, but you know who else is on facebook? — the cops. They were waiting for the event to start. I walked up about 5 minutes late just as the participants were being kicked off the field; thankfully the cops were reasonably cool about the whole thing and just told everyone to leave.

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Facebook TOS Revision Ploy

I find facebook really, really creepy, and refuse to open an account, despite a fair amount of prompting from friends. The idea of sharing information with peers like that is great. That is what blogs, email, IM, message boards, coffee houses and bars (all places where you mostly control your information. Except for the last one anyway.)are for. The idea of sharing information with Facebook, Inc. and their “trusted third parties” is not so great.
Their latest ploy to look open and concerned for the rights of their users is genuinely spectacular; I didn’t manage to figure out how it was going to work until I read around and saw it explained. This consumerist article is a pretty good overview. The current of posturing started over some unsolicited revisions to the TOS that were so objectionable that the normally uninterested complained. They quickly reverted the changes lest the “cool people” leave, and they end up like friendster. They then claimed they would “Open up the process” and produced a new draft terms of service (and a useless, totally nonbinding “Statement of Principles“). The draft TOS is actually, on a cursitory reading, substantally less objectionable than the old one, and they even made some cosmetic changes based on user input. However, there are two little problems.
1. The new “easy to read” terms don’t appear to be written in a legally rigorous way. If challanged, it should be easy to find/make loopholes for whatever happens.
and, far more interesting,
2. For the vote to count they are requiring 30% of users active in the last month to vote, and the estimates floating around the ‘net last night were more like 10%. The theory is that the whole arrangement is a ploy to be able to say “See? No one cares.” and go on with business as usual. This is actually a rather clever tactic if indeed that is the objective.
Accusations of not adequately publicizing the vote in order to make their point have already begun. It should be fun to watch, indignant hipsters vs. corporate entity desperately trying to look cool is usually a good show.

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Surprisingly Unregulated Substances

When going to order some Yerba Matè (the roasted stuff, I don’t like the green flavor) to mix up the tea-like beverage habit, I was reminded by the skeezy online botanical store that many surprising things are not regulated substances in the United States. I was subsequently compelled to order some goodies for after the semester is over. For those who don’t know me well, please note that I’m not in the habit of taking massive quantities of mind altering chemicals on a regular basis; I only go out in that sense maybe three times a semester, and am fairly disapproving of the pharmacological stuff, used therapeutically or otherwise. Also note that I’m not a believer in “It comes from nature, it must be safe/healthy(er),” the stuff discussed below is as well understood as anything to do with brain chemistry, and should be taken seriously. I tend to be pretty careful about my drug intake. Unless I’m drunk and someone cute hands things to me. The last line alone has made me stop arguing with “Boys are dumb” assertions. We are. We know it.

Because stuffing funny chemicals in one’s body is an interesting enterprise, and certainly one best shared with friends, the stuff I have on the way is(in order from tame to “I really shouldn’t do this”):

Yerba Matè (Ilex paraguayensis): A South American shrub who’s leaves can be infused much like a green tea (hot, but not boiling water). Very tasty stuff, earthy, smoky, chocolaty sort of flavor, and a nice deep orange color when brewed. It contains lots of delicious xanthines, including caffeine and a couple of its stimulant pals. It is often said to be a more desirable stimulant than coffee, inducing just as much energy but without the jitter, supposedly because of the wider, more evenly distributed variety of stimulants. I get it at coffee houses sometimes; it is a pleasant, energizing drink, and I have experienced its purported concentration improving effects. (erowid information)

Kava (Piper methysticum): A pepper plant native to several western pacific islands (Hawaii, Vantu, Fiji, etc.), Kava refers to both the plant and a cold infusion made from its root. The infusion is supposed to have effects sort of like alcohol, but more clearheaded. The agent for these effects are kavalactones, a class of psychoactive chemicals which affect a variety of neurotransmitters, providing anxiolytic (anxiety-reducing), anesthetic, and mildly sedative effects. Some kavalactones also supposedly act as a noradrenaline but not serotonin reuptake inhibitor, which is likely to enhance focus and clarity. All told, it sounds like excellent fun. I first heard about Kava as KavaJava, a mixture of kava infusion and coffee, which is mentioned frequently in the latter part of Kim Stanley Robinson’s Mars Trilogy, one of my perennial favorites. The combination is supposed to clip off the mild sedative effects of the Kava with caffeine, and leave only the (socially desirable) anxiolytic effects… which sounds like the perfect social beverage for me. (erowid information)

Salvia Divinorum – I’ve never tried hallucinogens (excepting one incident with a massive dose of food dyes to which I am allergic, but that wasn’t intentional or reproducible…), and this stuff seems like the perfect place to start. Salvia leaves can be smoked (at relativity high temperatures) for a short (~10 minutes) powerful effect, or chewed for a milder prolonged(~hour) effect. The short effective life is what makes it far more appealing to me than most hallucinogenic agents. The effects are said to often include uncontrollable laughter, and sometimes include vivid memories, visions, sensations of movement or becoming objects, and other surreal experiences. Neurochemically, it is a κ-opioid receptor agonist. Other κ-opioid receptor agonists have been studied medicinally as potential treatments for pain and mood disorders, but salvinorin A (the primary active chemical in Salvia Divinorum) has much more pronounced hallucinogenic effects than it’s peers, which is why it is of interest recreationally instead of therapeutically. This is interestingly NOT the same pathway by which “classical” (mescaline, LSD)hallucinogens function. The stuff I purchased is specifically a 10x standardized extractive (the leaves have had a known quantity of salvinorin A introduced, which is far more than occurs naturally), which apparently neatly situated between “strong enough to easily produce an effect” and “strong enough to easily hurt yourself.” It should be fun. Unfortunately, salvia a bit of a fad at the moment, so the expected horde of dumb teenagers and associated disapproving reactionaries have produced bans in several states, but not (yet?) in Kentucky. (erowid information)
Responsible friends are welcome to join me in playing with this stuff, the way the items are sold means I have far more of each than I am likely to use in a timely manner.
Writing this post is far, far better than thinking about my digital controls test tomorrow, which will eat me.

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Gui Boratto


(Come on Flatpress, let me do an embed…)
Excellent, accessible techno from Brazil, found from the recommended listening page of Questionable Content creator Jeph Jaques (yes, yes, webcomics are bad for you. I know.) I honestly didn’t get into any of the other things currently up there, but Gui Boratto is really excellent.
He strongly reminds me of Underworld, which is an old favorite, but Boratto is perhaps a bit more accessible. Like all accessible techno, it draws comparisons to Daft Punk, which is basically the golden standard for such things, even though the musical style is quite different. “No Turning Back”(embedded from youtube above) off the new album Take My Breath Away is my favorite track thus far. It’s subtle enough to work to, but interesting enough to keep you going, which is how techno should be.

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Caprica

I finally got to watching the Caprica pilot that has been sitting on my drive for most of the week after I ran out of drive to do useful things last night. It actually looks fairly promising, but it doesn’t grab and hold (a least for me) quite the same way the Galactica miniseries did.

***WARNING! SPOILERS! *****

The whole pilot had a very Idoru feel to it, with clever children/teens interacting and plotting in hacked parts of the Internet with virtual reality goggles. The uh… protagonist? Zoe Graystone even sort of reminds me of a composite of the Chia and Zona Rosa characters from Idoru. Smart girls doing daring things with technology is a good hook. The only downside to that premise is that it occasionally feels like one of those godawful shows about self-absorbed teens.

Like Galactica, it gets plenty of social commentary in the mix; there are lots of references to racism (apparently Tauron is a lot like Italy?) and one of the dominant themes is religious freedom; the primary conflict established so far is between the monotheist minority and the polytheist majority on Caprica.

aaand one last thought: Srsly? “The Cylons were created by man” sounded a lot better than “The Cylons were created by an angry dead girl and her deranged grieving father”

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