Wednesday, October 12, 2005

Avoiding computer-related health problems

If you work on a computer for more than an hour a day, you need to be careful about mainly three things - your eyes, your hands and your back.

Eyes
Health risk: Computer vision syndrome. The most common symptoms are: eye fatigue, dry eyes, burning eyes, light sensitivity, blurred vision, headaches.
Prevention:

* Position your monitor so there is no glare in your eyes — either direct, or reflected in the computer screen
* Adjust the screen brightness, contrast and colour to comfortable levels
* Rest your eyes every 30 minutes
* Refocus your eyes occasionally by looking at a distant object
* The distance from your eyes to the monitor should be 18 to 30 inches
* The top of the screen should be slightly below eye level
* Use an anti-glare screen
* When staring at a computer, people blink less frequently — about five times less than normal, according to studies. Look away often to induce blinking, or close your eyes briefly from time to time

Hands and wrists
Health risk: Repetitive stress syndrome. The common symptoms are tightness, discomfort, stiffness, soreness or burning in the hands, wrists, fingers, forearms, or elbows; tingling, coldness, or numbness in the hands; clumsy or awkward hands.
Prevention:

* Your keyboard should be at or slightly below elbow height (90 to 110 degrees)
* Your elbows should be close to your body, with your forearms relaxed
* Your wrists should not be extended, flexed or bent to either side
* Tilt your keyboard so that the front of the keyboard is higher than the back. Most keyboards have tiny pullout stands that help you do this
* Use the keyboard lightly. Don’t hammer it
* Use two hands to perform double-key operations like Ctrl-C or Alt-F
* Keep your mouse near and at the same level as your keyboard
* Avoid holding your mouse tightly and for prolonged periods
* Most important — don’t indulge in computer games that require long periods of intense keyboard or mouse activity

Back and shoulders
Health risk: Back and shoulder pain
Prevention:

* Choose a comfortable chair that provides back support. Rather than an upright position, recline at a 100- or 110-degree angle. Adjust the lumbar support so it conforms to the curve in the small of your back
* Keep your head and neck as straight as possible
* Avoid overreaching
* Chair arms should be used only if they do not obstruct your sitting position and posture
* Position your monitor, keyboard and chair in a straight line
* Your shoulder and neck muscles should be relaxed. Your upper arms should hang comfortably at your sides
* Your thighs should be parallel to the floor

More tips

* Break-up activities that require repetition
* Use a document holder to view documents and keep the holder near your monitor
* Your work surface should be large enough to accommodate computer equipment and work materials
* Keep frequently used items within easy reach
* Do not cradle your phone between your shoulder and chin. Use a headset if you use the phone and computer at the same time often
* Maintain a comfortable temperature in your work area


ooooooooooooo End of the post oooooooooooooooo

Tuesday, October 04, 2005

Apache Configuration

Key files in apache
/etc/rc.d/init.d/httpd start/stop/restart file
/etc/httpd/conf/httpd.conf Apache configuration file
/var/log/httpd Error and Access log files

Setting of multiple aliases in an apache server.

Code from the httpd.conf file

#
# Aliases: Add here as many aliases as you need (with no limit). The format is
# Alias fakename realname
#
# Note that if you include a trailing / on fakename then the server will
# require it to be present in the URL. So "/icons" isn't aliased in this
# example, only "/icons/". If the fakename is slash-terminated, then the
# realname must also be slash terminated, and if the fakename omits the
# trailing slash, the realname must also omit it.
#
# We include the /icons/ alias for FancyIndexed directory listings. If you
# do not use FancyIndexing, you may comment this out.
#
# destination Actual directory in system(this line is added by narendra)
Alias /icons/ "/var/www/icons/"


Options Indexes MultiViews
AllowOverride None
Order allow,deny
Allow from all

Note: If you put slash after destination than you have to put a slash after actual directory path also.


How to remove following error in postgres

# ERROR: language "plpgsql" does not exist

Solution: Issue the following command on console (command interpreter):

$ createlang plpgsql


ooooooooooooo End of the post oooooooooooooooo

Design thinking at work (Book summary)

Key things to keep in mind The essence of design thinking, in many ways, involves identifying problems by seeing things that other peo...