One great advantage electronic media have over printed media is quick and easy corrections. Someone may capture screenshots or save printouts, but you don’t have to send your delivery guys all over a city to retract a headline. The PG was able to correct on their website in short order, but the printed copies had already flooded the streets.
This is a serious mea culpa:
via Digg
The Software for Starving Students CD enhances the Windows and Mac desktop computing experiences by providing an easy way to install free, high-quality software titles via a user-friendly interface. It includes popular open source programs like Firefox and OpenOffice, intended to help students learn about and benefit from open source and free software programs. The SSS team put all the most commonly used free programs onto one CD to make it easier for students to install useful software (including fully-featured office suites, 3D graphic editors and much more) for free. To preview the new SSS interface, check out some screenshots of the latest release.
Full info at http://mirror.softwarefor.org/index.html.
via Digg
O'Reilly Media's latest book, Asterisk: The Future of Telephony, written by Jim Van Meggelen, Jared Smith, and Leif Madsen is the most complete book on the Asterisk PBX system to date. The new book, announced at Astricon 2005 covers many of the new features of Asterisk 1.2. In the spirit of open source, O'Reilly has licensed the book under the creative commons license making it free to download and distribute. If you are looking for the ultimate Asterisk book, you can now download the entire book as a PDF file!
Find it at http://voipspeak.net/index.php?/content/view/33/2/.
I was recently paid by a client, so I took the opportunity to add a little hardware to my home network:
My home network consists of two laptops (mine and Wifey’s, via w-fi), and my desktop (wired to the base station). I needed to be able to access the same files from my laptop and my desktop. These include my iTunes library, and source code stored in my VSS repository. Wifey needed to back up iTunes, and I needed to make sure she can access the thousands of images from the flower shop’s weddings and funeral work. Netgear’s “toaster” seemed like it would fit the bill, so I ordered it and a pair of Maxtor 200 GB IDE hard drives. Total cost was under $400, significantly less than for a full file server. One of the reasons this is so much cheaper than a full file server is that this is more of a networkable hard drive, and this particular model is meant for the home network. Technically, this device is a SAN, not NAS (http://kbserver.netgear.com/kb_web_files/n101547.asp). Similar products on the market are Iomega’s StorCenter hard drives or the lower-end Snap Servers. One advantage this device has over the other competitors is that you can determine how much storage you have. You have to buy the drives separately, but you can start with one and add another one later. You can also upgrade the drives for more storage down the road.
Setup was very easy—I literally opened the side of the SC101, dropped in the two drives and connected the power and ribbon cables to each. The side needed a little more force to get back on than I wanted to use, and the lock is spring loaded, so I had to use both hands, one to keep the lock unlocked until the side was back in place, and the other to press the side into place. It’s like they needed to leave a few mm more space than they did, and the side still doesn’t fit back perfectly. I then attached the network cable and plugged the unit in, and it started its self configuration. You do need to have your network running with DHCP, which is the default for most home networking gear. If you haven’t fiddled with the DHCP settings, you’re probably good to go.
Next step was to install the software, which you must use in order to make this work. Installation was quick, and it even prompts you to check for an update first. Good thing, as there was a minor version upgrade since my unit shipped. Once the software is installed, your first task is to configure the drives, and I was pleasantly surprised as to how the drives can be configured. During configuration, you’re prompted to check for a firmware upgrade, and this too had a minor version upgrade. The firmware upgrade was the only glitch in installation—the installer program crashed after the update finished, and I couldn’t reconnect to the device with the client software until I power cycled it. After the power cycle, I could configure the drives, and everything progressed normally.
I was most interested in having my drives mirrored for data protection reasons (http://kbserver.netgear.com/kb_web_files/n101543.asp), but you do have some options in how you divide the physical drives into logical drives. You can define the physical storage media into a number of logical drives, and each drive can be mirrored or not. I could have two drives, each of 190 GB (representing the two physical volumes), or one 150 GB mirrored and two 40 GB non-mirrored (one on each physical volume). I ended up with a 150 GB and a 40 GB drive, each mirrored. Total time was maybe 20 minutes from when I started unpacking to finishing configuration.
In the Amazon reviews, you’ll see people complain about the speed of the device. Part of this may have to do with the network speed, part may have to do with the speed of the physical drives (try to buy faster ones if you can), and part may have to do with the size of the logical drives. I use a Microsoft MN-500 base station running at 100 Mbps (the speed of most corporate networks), and it took 2–3 minutes to copy 1300+ files (894 MB) from my desktop to the SC101. You will probably get better performance by partitioning into smaller logical volumes, and by using a wired connection (the laptops connect at 10 Mbps via wi-fi, but newer wi-fi networks can connect at 54 Mbps). On the larger volume, it does seem to take a few moments longer to load folder and file listings than on the smaller volume, so I would suggest several smaller logical drives, rather than one monster drive.
There are a couple considerations/downsides. One thing you definitely need to make sure of is that if you’re using a wi-fi home network, you should definitely secure it with WEP or WPA, especially if you’ll be storing sensitive files on the SC101. If you don’t, there’s a chance someone could access your files. I suspect this device uses some form of embedded Linux, and it doesn’t support NTFS or Windows security—it just uses a simple password to access the volume (if you set one). There does not seem to be any client for Macs or Linux machines, only Windows. Since I bought two new drives off the shelf at Staples, I can’t say if older drives work or not (you can find a list of tested drives at http://kbserver.netgear.com/kb_web_files/n101554.asp). Also, Netgear’s website says that the device is compatible with Windows XP SP1, but the box and product insert both say that XP SP2 is the minimum system. I had to upgrade Wifey’s laptop to SP2 in order to make the client software connect, and the software worked fine after the upgrade to SP2. Also, SFS bypasses the Windows cache, so folder and file information must be reloaded each time you access your drives. This absoluetly slows the interface down, and can get annoying if you have to keep accessing different folders in a short amount of time.
All in all, I’m very pleased after several days of use. One cool feature is that the drives do not need to be defragged. The controller software uses SAN File System (SFS), which is self-optimizing (to oversimplify). Even though it’s not a Windows-based device, I haven’t noticed any incompatibilities at all, and the speed seems fine for normal file operations. And, you can choose to share the logical drives, or keep them private. This allows you to have a central family place for photos or whatever, and private drives for each family member.
<update 2006–01–01>
I noticed today that for some reason the Windows Installer is painfully slow when I have drives attached. When using the Add/Remove programs, or when installing a new application, the installation takes forever. To remedy this, I ran the drive wizard and detached the drive. Then, installation was pretty normal.
Wifey came through with a seriously cool find this Christmas–I didn’t even know these existed:
Logitech Wireless Headphones for iPod
These are Bluetooth-enabled headphones that connect to my iPod with a tiny transmitter. There are 5 buttons on the right earpiece (play/pause, FF, REW, vol up, vol down). Both the headphones and transmitter are rechargeable. The volume buttons are easily distinguished from the FF/REW by small dimples in the buttons, and the play/pause doubles as the power button on the headphones.
So far, I’m really pleased. These are not the lightest headphones you’ll ever wear, and people with melon heads may find them a little tight on the ears (especially if they wear glasses). The sound quality is surprisingly good–in fact, some of the best I’ve heard through headphones (not as good as my Etymotic ER-6i earbuds, but that’s to be expected). The Bodeans are crisp and clean, and my classical selections are full-bodied. The bass response is quite good, without sacraficing treble or suffering distortion. If I didn’t know these were from Logitech (which I still think of as a mouse company), I’d believe the speaker portions were from an audio company such as Shure or Sony. The headband goes behind your head, not on the top, so it won’t mess up your big hair. The headphones/transmitters are paired, so I don’t know if the signal can be shared. I’m the only one I know with these headphones, so I can’t test it, either.
For me, the best part is the wireless control. I’m no longer chained to a 4–foot radius in my office. I can move about freely, and still have control over the songs I listen to with the FF/REW buttons. It’s kind of Trekkie to press a button on the side of my head when a coworker stops by. Remember these control an iPod, not iTunes, so if you’re listening at home, you’ll need to use your iPod. At the end of the day, I just plug in the headphones and transmitter and let them charge overnight. I’m ready to go the next morning!
I would still recommend the Etymotic ER-6i earbuds for lawnmowing (snowblowing for the next few months) or plane travelling, but Logitech’s Bluetooth headphones are awesome for the office.
<update 2006-01-06>
Here’s the transmitter mounted on my iPod. USB-powered lava lamp not included.
Now playing: Southern Culture On the Skids – House of Bamboo
It’s been three years since the release of DotNetNuke, and today Shaun announced the DotNetNuke Benefactor Program. Basically, you can make a donation to support the project, and get some extra benefits in return. DNN will remain open source and free, and becoming a benefactor is optional.
The DotNetNuke Benefactor Program was created with the intent to preserve the delicate balance between the needs of the open source community, the serious business ecosystem it has fostered, and the on-going management of the project. The Benefactor Program provides the ability for community members to gain access to a premium set of layered benefit packages; with each level designed to satisfy the needs of a specific stakeholder group.
Full information at http://www.dotnetnuke.com/Home/tabid/894/Default.aspx.
Now playing: Pearl Jam – You’ve Got to Hide Your Love Away
If you were to take all of the chromosomal DNA in a single human cell, unwind the strands and lay them end to end, you’d have about 6-8 feet of DNA. If you were to take all of the chromosomal DNA out of a human body and lay it out the same way, you’d have a strand long enough to reach to the sun and back again (http://hypertextbook.com/facts/1998/StevenChen.shtml).
Let me repeat that. You have enough chromosomal DNA in your body to reach all the way to the sun and back! That’s some serious distance all wrapped up inside of us. It’s that wrapping I want to talk about in this post. This will be a bit of a simplification, but you’ll get the point.
DNA exists as a double helix. A corkscrew is an example of a single helix—there’s only one strand that is twisted up to form the helical shape. A nautilus shell is another example of a helix. In the case of DNA, there are two strands twisted around each other, forming a double helix. Imagine a ladder, with the legs secured at one end. You’re holding the legs at other end, and you start twisting the ladder—that’s pretty much what DNA looks like in its simplest form.
The example I used in my lab classes involved shoelaces. Take two shoelaces and hold them closely together. Secure one end (in a desk drawer, tape on the bench, or under that thick bio book). Then, while pinching both ends together, slowly and gently twist the shoelaces around each other to form a double helix. Stop when you have a helix all the way down the shoelaces. This is your basic double helix.
Now, start gently twisting again, leaving a little slack. After a few twists, the shoelaces will start coiling around themselves, forming irregular loops. The more you twist, the more loops will be formed, and the more compact your shoelace helices will become. This is how meters of DNA fit into each cell—very tight winding, around and around and around. As you can imagine, the irregular coils-upon-coils could cause problems for DNA replication, since they may end up in knots.
Instead of forming irregular structures, DNA in higher animals is wound around proteins called histones (follow the link for a good illustration). Wrapping DNA around histones helps keep in in regular structures, which are then wrapped around themselves, and so on. When time to replicate, the DNA is easily uncoiled from its regular structures. Much like your shoelaces, DNA does not coil and uncoil on its own accord—there is a system of proteins that perform this task, and the deeper science is truly intriguing. It’s a very elegant and amazing system, and it has to be to pack millions of miles of DNA inside my 6’ 4” frame. Elegant and amazing is the take-home message for this post.
On a similar note, if you want to see some really cool images of cells and DNA, check out the Invitrogen-Molecular Probes gallery at http://probes.invitrogen.com/servlets/gallery?id=18&company=probes. These are examples of cells stained with fluorescent dyes for various proteins, organelles and nucleic acids. These photos are as cool as the Hubble images, IMHO, and very similar in some cases.
Now playing: Budapest Strings – 2. Alla Hornpipe (Water Music Suite #2 In D, HWV 349)
In an effort not to write a Toltsoy-esqe blog post, I’m breaking some background information out into separate posts. There’s a point, I promise, it’ll just take me a couple posts to get there.
The Scientific Method is a standard process which is used to properly frame an experiment and guide the experimenter (at least it should be, but there’s a lot of junk being done these days). Various descriptions of the Scientific Method give it a variable number of steps–from 4 to 7. Those with fewer steps combine a few things that others break out into separate steps–there’s no big divergence in process. For the sake of discussion, we’ll use the description at http://www.sciencebuddies.org/mentoring/project_scientific_method.shtml.
One step, in this case #3, is always stating your hypothesis. Classically, one wouldn’t just make a single statement and test against it; one would make several statements, each predicting a different outcome of the experiment. Usually there is a statement of no difference, called the Null Hypothesis, and abbreviated H0 (that’s H sub zero). One would then offer Alternate Hypotheses predicting different effects, and abbrevizted Ha, Hb, etc.
Let’s look at a simple example: will fertilizer help us grow bigger tomato plants? We’ve made our observation that Farmer Brown grows nice tomatoes, and he uses fertilizer. Our hypotheses would be:
H0: Fertilizer will have no effect
Ha: Fertilizer will help our plants grow
Hb: Fertilizer will hinder our plants’ growth
Simple, and easily tested.
Not every hypothesis can be tested. The human lifespan is too short, and the vastness of space and time and the complexity of our own bodies (let alone the ethical considerations) make some hypotheses virtually untestable. In these circumstances, even with some solid evidence, the discussion is more academic and philosophical than scientific, especially if there are equally strong (or preposterous) interpretations of the same evidence.
Additionally, another important component of the Scientific Method is repeatability. Performing an experiment numerous times, and getting the same (or wtihin statistical probablity) answer each time is essential. In our tomato experiment, we can easily reproduce this hundreds or thousands of times under very controlled conditions. Referring again to vastness and complexity, some experiments can’t feasibly be repeated.
Quod erat demonstratum (“that which is to be proven”) sometimes always remains as such.
<background information>
For anyone who’s new to the conversation, I hold a BS in Environmental Science and an MS in Biological Sciences. I earned my MS studying the genetics of pollution-degrading bacteria and the external proteases of a pathogenic bacterium. While in graduate school, I was both a teaching and research assistant; I was awarded two teaching awards, and was rated “excellent” by my students when I taught MCAT prep classes for The Princeton Review. After graduation, I worked as a molecular biologist in medical research for many years before switching to computer programming.
</background information>
Now playing: BoDeans – True Devotion
This is for people who get the following error either immediately after you create a WSS site, or when you try to access a WSS site or SPS portal:
You are not authorized to view this page
You do not have permission to view this directory or page using the credentials that you supplied.
——————————————————————————–Please try the following:
Contact the Web site administrator if you believe you should be able to view this directory or page.
Click the Refresh button to try again with different credentials.
HTTP Error 403 – Forbidden: Access is denied.
Internet Information Services (IIS)——————————————————————————–
Technical Information (for support personnel)
Go to Microsoft Product Support Services and perform a title search for the words HTTP and 403.
Open IIS Help, which is accessible in IIS Manager (inetmgr), and search for topics titled About Security, Authentication, and About Custom Error Messages.
If you are using SPS, try to access http://<portalname>/default.aspx instead of http://<portalname>/. If you can access the URL with the pagename, then the problem may be in your application pool settings. Likewise, if you try to access a WSS site and get this error, see if you can add default.aspx to the URL. If that works, same problem. You might also get this error immediatelyt after you create a WSS site, at the point where you are supposed to pick the site template.
Fortunately, the fix is really easy. You need to open up the IIS manager on the server, and the open the properties for your virtual server. On the Home Directory tab, you probably need to change the Application Pool the site is running under. There’s probably one named SpsAppPool or something like that. If there are several and you’re unsure, try choosing them one by one, and trying to access the URL (the one without the default.aspx) after each change.
For more technical information, I recommend
Now playing: The Calling – Wherever You Will Go
We’re happy to announce the lauch of the completely revamped Designer Display Cakes (http://www.displaycakes.com/). Designer Display Cakes is a local creator of artifical wedding, occasion and everyday cakes, and her cakes have been featured in commercials for Saturn and on the TV Show “Ed”. The new website is powered by CandyPress shopping cart, with some tweaks and modifications. The photo gallery is nGallery with a customized theme. If you’re looking for a fake wedding cake, Designer Display Cakes is the place to find one!
Now playing: BoDeans – True Devotion
