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Posts Tagged ‘technologies’

Support information

1 What is information medium?

2 Which means that the media have a way of sequential or random access to information?
3 How we rank them according to the technology used in your configuration?
4) Make a list of at least 8 media find an image of each show its capacity for data storage and gives some general characteristics.
5) Find some images that show how to perform reading and writing data on magnetic media, in an electronic and an optical.

1 – With the constant evolution of computers in recent years, it is necessary that the information already developed by the computer to be memorized or stored in large capacity drives. These units are known as mass storage and are internal or external devices to the computer for storing large volumes of information, both programs and data.
These devices have a fundamental characteristic: the recorded information characters are not volatile, that remains even if power is disconnected.
The stored information will be treated later by another computer with similar characteristics to that was the source of information.

2-Sequential access: sequential access, the reading element of the device must pass through the space occupied by the totality of the data previously occupied space physically stored data comprising the set of information to be accessed.
Random access: the random access mode, the scan element can directly go to the address where the information is stored physically to be located without having to pass through to the stored between the start of the recording surface and the point where stores the information sought.

3-in computer keyboard is an input peripherals or devices, in part inspired by the keyboard of typewriters, which uses an arrangement of buttons or keys, to act as mechanical levers or electronic switches that send information to the computer. After the punch cards and paper tapes, the interaction through the ticker-style keyboards became the primary means for computer input.

4 – The characteristics that must be taken into account on a hard drive are:
* Access Time: Average time it takes the needle on the track and placed in the desired sector, is the sum of average seeks time (on the track), while read / write and the average latency (seen in the sector).
* Average Seek Time: Average time it takes for the needle placed in the desired track is half the time taken for the needle to go from the track more peripheral to more central disk.
* Time read / write: Average time it takes for the disk to read or write new information, the time depends on the amount of information you want to read or write, the block size, the number of heads, lap time and the number of sectors per track.
* Average Latency: Average time it takes for the needle placed in the desired sector, is half the time spent on a full disk rotation.
* Speed: revolutions per minute of the dishes. The higher the speed of rotation, lower average latency.

In addition to acquiring and expanding access to information and communication technologies (ICTs), countries should assess and strengthen their ability to use these tools, according to a new study by the Inter-American Development Bank (IDB).

Latin America and the Caribbean should improve the skills of its population, physical infrastructure and its institutions and its regulations, so that ICT can have a positive impact on development, the study concluded.

“With appropriate policies, governments can take full advantage of ICT tools to promote development. These technologies can improve the dissemination of information and help solve market failures, “said Alberto Chong, chief economist of the IDB and the study coordinator.”But it is important to note that, by itself, increased access to ICTs will not cause development. Countries should also focus on how to apply these tools. “

The book Connections development: the impact of new information technologies examines how ICTs have contributed to the success of 46 development projects in Latin America and the Caribbean in six areas: finance, health, institutions, education, poverty and environment. This study is the first in the region systematically applying rigorous statistical methods to measure how information and communication technologies had an impact on the results of the projects.

Based on randomized control trials and economic studies, researchers found that 39 percent of the reviewed projects benefited greatly from the adoption of new technologies, while others only partially or minimally benefited from the application of ICT.