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  1. Re:They're a resource, not a "problem". on Google Suggests Separating Students With 'Some CS Knowledge' From Novices · · Score: 1

    Unfortunately, studying the solution is not the same as developing a solution. Students with less experience need time to figure out the solution themselves. Being given the solution hurts the weaker student more than it helps. I speak from experience, specifically as a professor who has taught an intro programming course (as well as senior design and graduate level courses, where the same concepts apply). In the intro programming course, students were paired with partners of similar strength, NOT strong with weak. Similar strength partnerships tends to lead to better learning experiences for all involved.

  2. Re:Bizarre advice on Mathematicians Are Chronically Lost and Confused · · Score: 1

    I don't think the author is suggesting that details don't matter. Rather, he is suggesting that on a first pass through material, it is often better to focus on learning the material on a conceptual level (where is this material taking me? What does this theorem really tell me?) rather than focusing on the mechanical details of the derivations and proofs. To a certain extent, this is already built into the curriculum: freshman and sophomore mathematics coursework tends to focus on concepts and computation, while junior and senior coursework chases after the fundamental reasons why the theory works. Consider, for example, the relationship between Calculus I (freshman course) and Intro to Real Analysis (sometimes called Advanced Calculus, typically in the senior year). These courses cover very similar material, but the mathematical maturity required for Real Analysis course is significantly higher. I believe the author is suggesting that students spend more time on understanding the "why" and less time on "how". You can go back and figure out the "how" much quicker a little later on. "How" is nevertheless important, because ultimately you need to learn how to prove your own results.

    The other important point is that the author's intended audience are individuals who are determined to master mathematics at a deep level, the sort who are determined to crank through all the details. The message makes much less sense outside of the intended audience.

  3. Re:What's wrong with keyboards? on The Leap: Gesture Control Like Kinect, But Cheaper and Higher Resolution · · Score: 1

    Check out the Evolve line of showerheads. You still have to turn on the shower to start the purge, but the showerhead cuts the flow once the water gets hot, and then you restart the flow by pulling a cord. That way you waste only the water that was sitting in the line, not the hot water.

  4. Re:What you actually did is more important on Ask Slashdot: Which Ph.D For Work In Applied Statistics / C.S.? · · Score: 2

    I agree with this. Average starting salaries for a PhD in CS will be higher than for a PhD in biology. This could matter during salary negotiation.

    For BS and MS degrees, the name of the university is important, because there is generally no guarantee that you spent significant time with a faculty member. For a PhD, the name of your thesis adviser takes precedence over the name of the university, especially if the adviser has a respected name in the field. For these reasons, I would opt for the CS degree from the (lesser known?) European university rather than the Biology degree from the American Ivy League university.

  5. Re:Filed in July 2005 on Nintendo Faces Patent Suit Over the Wii · · Score: 2
    The patent application didn't publish until Jul 13, 2006, four months before the release of the Wii to the public on Nov. 19, 2006. Nintendo would not have known about the patent application until after the publish date. (The original filing date is for the provisional patent, which is secret). The design of the Wii controller would have been locked down long before that, because developers need to have games ready at launch. According to Wikipedia, Nintendo settled on the controller design in 2005, though the design was not announced to the public. This timeline makes it seem possible that ThinkOptic submitted their provisional patent application when they heard rumors that Nintendo would use similar technology. (There was certainly a lot of speculation in 2005 about the novel controller that Nintendo was going to release.)

    Note that this is a United States patent case. Under US patent law (unlike international patent law), patent rights are assigned by first to invent, not first to file. This means the case depends on how long Nintendo and ThinkOptic were working on the devices before filing. This makes for really messy patent fights. I'm really surprised that Nintendo wouldn't have previous patents related to this technology. Then again, they probably do, but those patents aren't mentioned in the article, which is written from the ThinkOptic perspective without a response from Nintendo.

  6. Re:It's convenience and security. on Why the Fax Machine Refuses To Die · · Score: 1

    I think you've correctly identified most of the requirements
    1) requires minimal training
    2) secure and reliable
    3) provides point to point connection with verifiable delivery
    To which I'd add:
    4) backwards compatible with fax
    Since everyone in an industry is not going to switch from fax at once, it'd be best if the same device could be used for remote document delivery, whether it be over fax or IP. It seems like there could be an opportunity for a combination of an internet service and firmware to be licensed by scanner/fax OEMs. The scanner/fax/printer would be plugged into both network and phone line (or perhaps use a a VOIP connection through some service, so then just plugged into network). You would enter the phone number or Machine ID you want to send your document to. If it's a phone number, the document is routed over the phone line (or VOIP) as a tradition fax. If it's a Machine ID, it contacts the central server of the internet service, which tracks machines using unique static registered IDs. If the requested machine is available to receive, then the server provides a tunnel from one machine to the other (machine makes outbound connections to the server to get around firewall issues). All data on the network between the two machines would be encrypted. The received document could be immediately printed (if the machine includes a printer) or logged as a pdf file. (There could be several options for getting the pdf to somewhere useful. e.g. machine could appear as a network drive, could locally email the document, or could allow it to be copied to a usb thumb drive.) The server could provide receipt confirmation. The advantage over traditional fax would be that a separate phone line would not be needed, and much high quality scans could be transmitted as fast as you can scan them (in color even). A disadvantage is that the internet service knows who is faxing whom (though wouldn't be able to decrypt what was faxed), which might raise privacy concerns. This all seems very feasible. The tricky part would be getting buy-in from the OEMs.

  7. Re:A word processor? on Is Free Software Ready For E-publishing? · · Score: 1

    I've used both systems for small, medium, and large documents as well. For documents that are written by large numbers of authors in short amounts of time (like grant proposals), I like Word with Track Changes. I find the visual display of changes in the formatted document focuses attention and speeds up the writing process. I'm fine with non-WYSIWYG editing in general, but the visualization of changes is just really effective.

    I know how to return clicks from xdvi and yap to an editor. But it's the coauthors' edits that I'm interested in, not just finding my place in the source file or identifying who wrote a particular line.

    I've used versioning systems with latex documents as a single author as well as with coauthors. It worked great as a way to keep a centrally located authoritative version of the document. One thing I didn't like was that versioning systems often pay attention to whitespace, so trivial changes in the line wraps would be reported as large changes in the document. (This was with CVS. Perhaps newer systems understand text better.)

    With latex documents for which someone else is the primary author, I often end up writing comments on a printout, scanning, and returning. This generally ends up being a better use of my time than trying to teach a coauthor (often not a programmer) about versioning systems.

  8. Re:A word processor? on Is Free Software Ready For E-publishing? · · Score: 1

    The real magic of Word's Track Changes feature is the way it allows you to quickly see what's been changed and commented on in the *formatted* document. Marginal comments and changes pop out visually when you scroll through the document, and the displayed comments can be filtered based on the user who wrote them. This is an especially nice feature for giving feedback to the main author on collaborative writing projects. I can imagine a Latex package that would allow you to place comments in the margin with an arrow to some highlighted text with coloration based on, say, a username embedded in a field of the comment. A flag could optionally suppress the comments in the compiled document (so that the comments don't *have* to be removed.) If such a package existed, it would go a long way toward matching track changes (when combined with a versioning system). To my knowledge, there is nothing quite like this for latex at the moment?

  9. Re:Mojo back? on How America Can Get Its Tech Mojo Back · · Score: 1

    Manufacturing is not R&D, but the employees at a $4billion semiconductor fab are not exactly low wage labor. A lot of highly skilled engineers are employed in manufacturing, especially high tech manufacturing. There are efficiencies to be gained by co-locating R&D and manufacturing, since they motivate one another, e.g. atomic force microscopy was developed at IBM to analyze flaws that were too small to resolve with SEM in chips coming off the line.

    The separation between US R&D and China manufacturing persists because more of the qualified R&D workforce prefer to live in the US than in China. That won't necessarily always be the case.

  10. Read "Getting to Yes" on Ask Slashdot: How To Ask For Equity In a Startup? · · Score: 1

    I recommend reading the book "Getting to Yes". It's a fluffy business book, but by far the most useful such book that I've ever read. It presents a very nice way of understanding and approaching the process of negotiation. Basically it comes down to 1) identifying your personal interests and the mutual interests that you share with the negotiating party and 2) identifying your "Best Alternative to Fairly Negotiated Agreement (BAFNA), i.e. what your fallback plan is if the negotiation falls through. The negotiation process starts with a discussion of the various interests and possible arrangements that can satisfy the interests, while avoiding positional bargaining (I want this much. You can have this much. No, I want at least this much...) The strength of your negotiating position depends on the attractiveness of your BAFNA, (and the strength of the other party depends on their BAFNA). This may all sound like plain old common sense, but I find that this framework helps structure my thoughts and approach to negotiating, leading to more success and less pain...

  11. Re:The goal should be to research something releva on Reform the PhD System or Close It Down · · Score: 1

    Galois was significantly earlier than the study of symmetry of molecules.

  12. Re:And this... on Google Cuts Chrome Page Load Times In Half w/ SPDY · · Score: 1

    If Chrome is suddently twice as fast on Google websites then all other browsers, then gives the combination of Chrome+Google websites a huge advantage.

    Because the big bottleneck on the web is the time spent waiting for search results?

  13. Re:Another fossil fuel? on Researchers Develop Biofuel Alternative To Ethanol · · Score: 1

    In the current corn process, you grow a whole stalk of corn, take off the ear, shell and mill the grains, break the starches down to sugar and then ferment. A lot of energy went into growing an 8ft tall, rigid plant, but you only take energy from the grain. In comparison, converting cellulose directly to a usable fuel could yield much more energy from a given plant. The plant body is very high in cellulose, giving it a rigid structure. Even for corn, there is more energy stored in the stalk than in the ear, but previous processes for converting cellulose to a usable fuel are too energy inefficient, using up more energy in processing than you get out in fuel. The goal of the recent biofuel research is to find an energy-cheap conversion from cellulose to fuel. That would improve the overall energy balance (energy in the fuel minus all energy used to produce the fuel) for biofuels. The more net positive this balance is, the more benefit from biofuels. Moreover, hardier crops such as switchgrass and sorghum could be grown for cellulose. These crops can be grown on poorer land with less fertilizer and less care and easier harvesting.

  14. Re:High school chem? on Video Shows Why Recharging Kills Batteries · · Score: 2

    From the abstract of the associated article, the contribution is realtime visualization of the growth of the nanowire during charging. It's hard to get this sort of setup into a transmission electron microscope. If your institution has access, the full article can be obtained by following the link from the abstract. I can't imagine why the editor posted this without an appropriate link to the article. The video is otherwise meaningless.

  15. Re:How about "education"? on Aussie Kids Foil Finger Scanner With Gummi Bears · · Score: 1

    From what I read in the first article, these biometric sensors have been shown to accept gelatin molds by security researchers, but not necessarily by the students yet. As with any security measure, there are ways around the fingerprint biometric. You can also bump a lock open, but that doesn't mean that we've stopped using locks. Security measures are designed to set up a system of incentives that make the desired behavior (much) more probable than the undesired behavior. In this case, the goal is to reduce truancy. While it is technologically feasible to cast fingerprint molds from gelatin and where it on your finger to enter the building, will it really be worth the effort to do so on a regular basis? Gelatin is a relatively fragile material. I doubt these will hold up for long periods of time. Certainly it seems like considerably more work than swiping an extra card. I expect students who were selling "attendance" service by swiping extra cards (as described in other comments) will find it much more expensive in terms of time and resources with the biometric scanner in place. A security measure doesn't have to be perfect to be effective. A remaining question is whether the reduction in truancy rate is worth the cost of the sensors.

  16. Magnetic gears? on Programmable Magnets · · Score: 4, Informative

    The "frictionless" magnetic gear shown will still have friction in the bearing. The magnetic "teeth" will introduce a huge amount of backlash into the gear system. And you would run into problems if you tried to stack gears beside each other in a gearbox. The high pull-off force/low twist-and-pull force application is neat though. One limitation is that rare earth magnets tend to be brittle, and make a mess when they break.

    To be clear though, magnets have been made with multiple poles for a long time, for example those flexible fridge magnets will often have alternating poles across their surface. Also, the pull off application is in many ways similar to the "switchable magnetic bases" . In these devices, the orientation of the magnetic is changed to force the field lines to go through the surface underneath, or to be contained within the base. The innovation in the present work is the use of coding theory to design the patterns.

  17. Hover shoes! on Cooking With Your USB Ports · · Score: 1

    No. Everything on youtube is true. Especially hover shoes.

  18. Re:Don't listen to grad students (well except me) on Finding a Research Mentor? · · Score: 1

    That depends, at least in part, on whether the faculty at your institution show up for department socials. I recommend sending an email requesting a few minutes to meet with them to get advice about graduate school. The faculty member may suggest to stop by during office hours or to set up a appointment. (Or if you send the email the week of a social, perhaps to meet there.) If you don't get a reply to the first message, try again a week or two later. Faculty generally don't have time for long email exchanges, but a preliminary email helps focus the conversation once you do meet in person.

  19. Oops on Lost Ends · · Score: 1

    The last link was supposed to be this.

  20. Re:Was Not Impressed at All on Lost Ends · · Score: 1

    What was the main plot again? I think my plot summary would have been different after each season. The show contained an inordinate amount of feints and misdirection. Each of the above "answers" prompts more questions. Personally, I prefer fiction to follow the principle of Chekhov's gun. Serial writing can't often be so consistent because the story will told over an unknown number of episodes. But Lost had a known end date with three full seasons to complete the story. I think it could have been done better. This pretty well captures my gut reaction.

  21. Re:Was Not Impressed at All on Lost Ends · · Score: 1

    The finale did a fine job of explaining the alt-universe. That was fine. But the alt-universe only entered the story line in, what, Season 5? (After they knew the ultimate end date for the show.) The creators substituted answers about a cheep plot device that entered late in the show for answers about about the island itself .

    I watched, as I believe many did, because I was interested in the mythology of the island, which formed the core of Seasons 1-4. The writers have been promising that there was a deep explanation underlying the mythology since Season 1. In the end, very little was answered. Do we know anything about why the Dharma Initiative was there? Why food fell from the sky? Why the Egyptian symbolism was there? Where the island came from? What its purpose was? Why people were "studying" the island? The answers that were provided never really provided further insight. e.g. the numbers were the remaining candidates. Then why were they "bad luck"? Why were they written on the hatch? Each reveal promised that eventually a key would be provided that really made everything fit. But no. They could have left plenty of ambiguity while still fleshing out the backstory of the island. I suspect they had already written themselves into a corner and introducing and explaining the alt-universe was easier than trying to form something sensible out of what they had already written.

  22. Apples and Oranges on The Sad History and (Possibly) Bright Future of TiVo · · Score: 1

    Why would you even think to lead your submission with a comparison between TiVo and the iPod/iPhone. If you want to compare TiVo to an Apple product, how about the set-top box Apple TV. Or compare it to the Sling Box, or to a Windows Media PC, or MythTV, or something else serves an even remotely similar function to TiVo. Different markets perform differently.

  23. It's a capcitor! on New Material Transforms Car Bodies Into Batteries · · Score: 4, Interesting

    The device is a capacitor that can also support mechanical load. The first hint is that they call it energy storage, but never actually call it a battery (though it may "replace a battery"). In the linked video, they are using a custom device (indicated by the Imperial College in the upper left), that is also labeled as capacitor charge-discharge indicator. The storage device appears to be two sheets of carbon fiber mesh held together with a "multifunctional resin", i.e. a nonconductive material with a high dielectric constant that is also capable of supporting a large mechanical load (or rather, binding to the carbon fiber so that it supports a large mechanical load, i.e. a composite). The idea of using ultracapacitors to replace batteries has been around for a long while. Ultracapactiors usually use esoteric materials and have problems with leakage over long periods of time, but have met with success in some applications. The military has funded a lot of research for ultracapacitors to replace batteries for the electronics on missiles, an ideal application since missiles potentially sit on the shelf for years, and then need to function precisely for a very short period of time. (the cap would be charged as part of the launch procedure.)

    In the example mentioned in the video (GPS case made of the material), I'm not sure why it would reduce wiring, since the capacitor would still need to be charged, just as if it were being fed by the cars electrical system. I suspect there are some real advances in the work, but the interesting features don't come through in this video for public consumption.

  24. Mod parent up! on UCLA Profs Banned From Posting Course Videos · · Score: 1

    The link provides a very even-handed discussion of the issues involved.

  25. Re:Summary Is Confusing or Erroneous on UCLA Profs Banned From Posting Course Videos · · Score: 1
    I still believe a fair use argument would be on shaky ground, but as someone else pointed out below, Fair Use is not the most relevant section of copyright law in this instance. Sec110 - Exemption of certain performances or displays applies more directly. Certainly (1) seems to permit showing a full video so long as the instructor is present in the classroom and the video is directly relevant to the class. (I am now confused. We were advised to buy the "educational group licensed" version by the university, but I am not sure what further benefit this license provides, and I can't find one of the licenses right now to be more concrete.).

    Regarding the issues at UCLA, Sec110, (2) covers transmitting a work (as also pointed out below). The exemption in (2) applies to:

    the performance of a nondramatic literary or musical work or reasonable and limited portions of any other work, or display of a work in an amount comparable to that which is typically displayed in the course of a live classroom session, by or in the course of a transmission, if.... [more conditions]...

    Since a movie does not seem to be a nondramatic literary or musical work, the movie would fall under "any other work," so a "reasonable and limited [portion]" of the work may be performed if the subsequent conditions are also met. For the UCLA case, that seems to imply that you are limited to using a part of the work. The alternatives would be to show it live with an instructor present (but the faculty don't want to waste class time or schedule TAs for group showing) or to provide copies for individuals to check out (but the hours of the media center are inconvenient). (Hmmm, the educational license I mentioned may have allowed a group to watch for educational purposes without an instructor present, e.g. a group showing in a library media center). In any case, it seems that the problem can be solved by working out a different licensing agreement.