Computer World. Матросова Т.А. - 83 стр.

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82
Wrist angle. If your keyboard is positioned properly your wrists should be able
to rest comfortably on the table in front of it. Some keyboards are so «thick» that they
require you to bend your hands uncomfortably upward to reach the keys. If so, it will
help to place a raised wrist rest on the table in front of the keyboard. A keyboard that
requires you to bend your wrists is a common cause of CTS among computer users.
Elbow angle. With your hands resting comfortably at the keyboard and your
upper arms vertical, measure the angle between your forearm and your upper arm
(the elbow angle). If it is less than 90 degree, raise the seat of your chair. If the angle
is greater than 90 degree, lower the seat. Try to hold your elbows close to your sides
to help minimize «ulnar displacement» – the sideways bending of the wrist (as when
reaching for the «Z» key).
Waist angle. With your elbow angle at 90 degree, measure the angle between
your upper legs and your spine (the waist angle). This too should be about 90 degree.
If it is less than 90 degree, your chair may be too low (and your knees too high).
Otherwise, you may need to alter the position of the backrest or adjust your own
posture (nothing provides better support than sitting up straight). (Note: If making
your waist angle 90 degree changes your elbow angle, you may need to readjust the
height of your chair or table.)
Feet. With your elbows and waist at 90 degree angles, your feet should rest
comfortably flat on the floor. If they don’t, adjust your chair and table height and
repeat the steps above. If your table isn’t adjustable and your feet don’t comfortably
reach the floor, a raised footrest can help. Otherwise, you may need a different table.
TEXT 5
BUI ULDI NG A WEB-BAS ED EDUCATIO N SYS TEM
What is a Web-based classroom?
The use of computers and communication technologies in learning has a history
going back at least 30 years. In that time it has been called by many names, including
computer-mediated communication (CMC), computer conferencing, online learning,
Internet-based learning, and telematics. The advent of the Web provides a new and
interesting environment for CMC that offers a host of new possibilities together with
many of the advantages of previous incarnations but without some of the problems
that have dogged computer-based learning.
A Web-based classroom is an environment created on the World Wide Web in
which students and educators can perform learning-related tasks. A Web-based
classroom is not simply a mechanism for distributing information to students; it also
performs tasks related to communication, student assessment, and class management.
Your imagination and resources are the only limits to how you utilize the Web.
Many of the tools that provide the functionality of the Web-based classroom
have very little to do with the Web at all. A Web-based classroom may use Internet
applications such as e-mail. Usenet News, FTP, and a variety of other computer
applications such as databases. The Web provides the simple, familiar interface by
which the students and educators in a class can access and use these applications.

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