Month: March 2007

Categories
Semantics

Big boom

Kurt Cagle wrote an excellent essay on semantics, Some Thoughts on Semantics.

He talks about the technologies associated with the building of the semantic web, and how each technology builds on the previous to provide greater degrees of accuracy. RDF can be used to make assertions and ontologies can be used to ensure the accuracy and validity of such assertions, and eventually other heuristics can be discerned and codified leading to greater accuracy in both search and discovery. This is the good that we all seek. However, as we writes, it is also the Sword of Damocles: the threat of being undone by the very systems we seek fervently to create:

Of course, this also raises some very disturbing questions about the ethics of using such systems, something I think as a society we are woefully inadequately prepared for. If a murder is committed and the use of an inferential engine can make a strong circumstantial case that a given person is the guilty party, is the use of such an engine admissible as evidence? If the performance of a query implicates a politician in a scandal inadvertently, can a news organization use this information to bring down that politician – can his opponents? Is it ethical to use such a tool to find not only terrorists, but those people who may become terrorists but aren’t at this point? The benefits of such systems are obvious, but just as the use of search engines is raising whole new levels of questions about the ethics of such search, so too will inference engines change the nature of how we interact with one another.

Semantics, as S.I. Hayakawa himself indicated, is a duel edged sword…it underlies the very nature of communication and what it means to be intelligent, yet when semantics is codified and computerized, it also takes meaning and turns it into a manipulatable construct that can be used for good or ill. We have taken philosophy and turned it into engineering …

It is ever so, in science and technology both, to explore such issues after the Big Boom rather than before.

Categories
Technology Weblogging

WordPress and categories

WordPress has some really serious flaws in its post management. It flips posts to private, it resets categories, it returns 404 for pages that are found. If you have a post up in one window and forget and open it into another window, the auto-saving will overwrite your changes, even after the item is published.

The most serious for me is how it handles using categories as part of the URI. I never cared for using a date, but just using the title provides no classification. A good compromise seems to me to use categories. However, lots of problems with WordPress and categories in the URI.

For instance, if you pick multiple categories, you have no way of specifying which category should be used to form the permalink. If you end up adding a category after the post is published, it’s just as likely to be assigned the permalink and you end up with multiple permalinks for the same post.

I am in the process of basically gutting WordPress’ management of permalinks and rewrite rules. What I’ve started doing is using the custom metadata fields for ‘categories’, and including these in the feeds. I need to add in ways of searching on these when people click the links so that all related posts are returned.

I’m then just using WordPress’ category feature as a way of picking a domain, or more properly, subdomain or major classification for the individual posts.

This makes sense: how you want a page organized on your site has little to do with how you want it categorized or ‘tagged’ when it comes to search and external groupings.

It’s been frustrating making these moves. I redirected several folders to ‘gone’, or 410. Google treats these are errors, rather than communication, and just keeps reporting them in the Webmaster tools as such. And it keeps showing thousands of pages as 404, yet they’re served just fine. I believe this has to do with the WordPress 404 errors.

Just as with the move to XHTML, this is a work in progress. I’m not sure I can encapsulate all the changes as plug-ins for others to use. I’ll try, but I may end having to do what one person suggested: grabbing my own copy of the source code for WP through source code control, and when a new release is made, doing compares between my modifications and the new source and adjusting accordingly.

Categories
Critters

The cardinal

The weather has been so warm, I’ve left my windows open at night.

This morning, at 3 in the morning (I checked), a cardinal sat on my window sill and let forth with glorious song for the next 53 minutes (I checked that also).

It was very disconcerting. Oh, not the noise; or being woken up out of an exhausted sleep, well aware that I must be up no later than 6 in order to meet this day’s tasks.

No it was the strange feeling I experienced, made up of equal parts charmed delight and murderous rage.

Categories
Environment

Environmental wacko? Or urban intellectual

Black River News reports on the Ameren/FERC meeting yesterday that discussed rebuilding the Taum Sauk reservoir. I thought the following interesting:

The public comment part of the meeting consisted of about a dozen local citizens. For the most part is was an Ameren love fest, with everyone imploring FERC of approve the dam rebuild because the Ameren taxes were so important to the Lesteville area. One person did make a lot of comments about the problems in the East Fork and problems with past decisions that were made by Ameren. Another speaker asked FERC to ignore the “environmental wackos and urban intellectuals” and only listen to the real local people. The meeting only lasted half the allowed time.

(emph. mine)

I’m not sure if I qualify as an environmental wacko, or an urban intellectual. Frankly, I find both labels to be flattering, so I would be happy to claim both.

Thing is, anything to do with a river is not just a local event. River quality can have major impact on an entire region, state, or even multiple states and countries. Water is the great connector, and Missouri is connected by lots and lots of water.

I thought it interesting that Ameren’s FERC meeting came about at the exact same time as the more publicly compelling meetings about utilities rates. The St. Louis Post-Dispatch and most other media were full of the latter, and never a mention of the former. That’s short sighted, and not particularly thorough.

The only ones who seem to be discussing anything related to Taum Sauk and Ameren are Black River News and me, and I don’t think my comments are necessarily appreciated in Lesterville.

I think I’m going to hit the DNR up for a photo tour of the Shut-Ins. I wonder if the freedom of information act would cover such? Since nothing is coming out about the state of the clean-up from either Ameren or the DNR, and the media is too busy covering utility rates.

Categories
Photography

Sensor cleaning, part ouch

I wrote a post about camera sensor cleaning a few months back. It would seem that the concept of sensor cleaning is a little more complex than I originally thought. Maybe I was right to be paranoid.

Doug Pardee sent me an email with a warning about sensor cleaning, type of camera, and fluid used, and he gave me permission to re-produce:

Once upon a time, the front of the sensor assembly in every DSLR model was glass. You could just go in there and clean it with anything suitable for cleaning glass. The big concern was not making things worse by leaving spots and streaks.

In the past couple of years, however, some DSLR models have been designed with sensor assemblies that have exposed coatings on the front. Cameras that I know do this are the Canon EOS 5D and three cameras with dust-shakers on their sensors: the Sony Alpha DSLR-A100, the Canon EOS Digital Rebel XTi aka Kiss Digital X aka 400D, and the new Canon EOS 1D mark III.

This design change is basically a cost-saving measure, but the manufacturers seem to be spinning it as a “feature”. From what I can tell, the exposed coating in the cameras listed above is the dichroic “hot mirror” that keeps the sensor from being overly sensitive to infrared. The hot mirror coating is typically something like indium tin oxide, which is electrically conductive by nature. I believe that the manufacturers are spinning this exposed hot mirror coating as being an “anti-static” coating for dust control.

Ordinary Eclipse fluid has been known to attack hot mirror coatings. In the past, this only occurred when the sensor assembly was incorrectly assembled at the factory, accidentally resulting in exposed coatings. But now, sensors on some DSLR models are *designed* to have the hot mirror coating exposed.

Accidental removal of some of the hot mirror coating would cause the sensor to be overly sensitive to IR in those parts of the sensor where the coating was stripped away. In most photos that would not be noticeable. But some materials are particularly reflective of IR, notably clothing made of some synthetic fabrics. Some white paints also reflect a lot of IR. Photos of subjects with those materials can be subject to false color if the hot mirror is missing.

Photographic Solutions has developed a new cleaning fluid called Eclipse “E2” for sensors with exposed coatings. This was apparently done at the behest of Sony, who wanted a safe wet-cleaning fluid for the DSLR-A100. Sony has approved E2 for the A100.

Photographic Solutions recommends E2 for all four of the camera models mentioned above. But I was surprised to find four other camera models on that list: the Leica M8 and the Nikon D70, D70s, and D80.

Here’s the list.

I don’t know what coating(s), if any, are exposed on those four additional camera models. The Leica M8 sensor doesn’t even *have* a dichroic hot mirror coating – the photographer needs to use a separate hot mirror filter on the lens.

For an example of what the IR “false color” issue looks like, go to this article and scroll down about halfway. There are two photos there comparing a Canon 5D with a Leica M8. As I mentioned, the M8 doesn’t have a hot mirror coating on its sensor. Also note the other M8 photos that came out fine even without the hot mirror… er, well, now that you know what to look for, you might spot some less obvious false color in some of the other photos.

As I said, I don’t know what the situation is on the Nikon D70. But my recommendation would be to switch to E2 fluid. Photographic Solutions says that E2 is good on all sensors, with or without exposed coatings, so you could also use it on the D200. Or use your existing supply of Eclipse fluid on the D200.

Check ve-e-ry carefully about which sensor cleaning fluid you can safely use with your camera. Thanks muchly to Doug for heads up.