3669233
Description
Mind Map by chong.lee.soong, updated more than 1 year ago
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Created by Haha_fizul
about 9 years ago
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Copied by chong.lee.soong
about 9 years ago
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DATA_v1
- Data Checking
- Data Verification - It is to check the data for error
- Proof-Reading
- The person entering the data simply
reads through what they have entered
to check it is correct or not. Usually
checked with the original copy.
- The person entering the data simply
reads through what they have entered
to check it is correct or not. Usually
checked with the original copy.
- Double-Entry
- The data is entered twice. The
computer compares the data, and
anything that doesn't match is
questioned.
- The data is entered twice. The
computer compares the data, and
anything that doesn't match is
questioned.
- Proof-Reading
- Data Validation - it is to check the data
input is incomplete or unreasonable
- Presence- Check
- It is a check to see if
the data is entered.
- E.G: You forgetting to type
ponylover43@yahoo.com.sg
in the E-mail section. Then
there is a warning that says
you need to type it in.
- E.G: You forgetting to type
ponylover43@yahoo.com.sg
in the E-mail section. Then
there is a warning that says
you need to type it in.
- It is a check to see if
the data is entered.
- Format-Check
- It checks whether the
data is in the correct
format.
- E..G:date should
be in DD/MM/YYYY
(Not like USA)
- E..G:date should
be in DD/MM/YYYY
(Not like USA)
- It checks whether the
data is in the correct
format.
- Check-Digit
- Used for numerical data. An extra
digit is added to a number which is
calculated from the digits. The
computer checks this calculation
when data are entered
- Used for numerical data. An extra
digit is added to a number which is
calculated from the digits. The
computer checks this calculation
when data are entered
- Character-Type
Check
- Character type
check is a check to
make sure only
certain types of
characters are in
the data.
- E.G: A name should
not have numbers.
- E.G: A name should
not have numbers.
- Character type
check is a check to
make sure only
certain types of
characters are in
the data.
- Range-Check
- A range check is a check
to make sure a number is
within a certain range.
- E.G: A driver's age should be 17 to 99.
- E.G: A driver's age should be 17 to 99.
- A range check is a check
to make sure a number is
within a certain range.
- Parity check
- Use the last digit of a set of data to check the correctness of data. In a
set of data,, the last digit is used as parity digit. If there are even
number of 1 in this set of data, the parity digit is set to 0. If there are
odd number of 1 in this set of data, the parity digit is set to 1.
- Use the last digit of a set of data to check the correctness of data. In a
set of data,, the last digit is used as parity digit. If there are even
number of 1 in this set of data, the parity digit is set to 0. If there are
odd number of 1 in this set of data, the parity digit is set to 1.
- Presence- Check
- Data Verification - It is to check the data for error
- Data Process
- Batch Processing
- Batch processing is where the data is
collected first, and then at a certain
period of time, usually after a month,
the data will be updated.
- Adv - The data can be processed at a later time so that
the resources can be used to perform other tasks
- Adv - The data can be processed at a later time so that
the resources can be used to perform other tasks
- Batch processing is where the data is
collected first, and then at a certain
period of time, usually after a month,
the data will be updated.
- Real-time Process
- Real-time Processing is where
the data is collected and
updated on the spot.
- Adv - the data will be updated immediately
- Adv - the data will be updated immediately
- Real-time Processing is where
the data is collected and
updated on the spot.
- Batch Processing
- Data Collection
- Open-Loop
- The sensor detects a change in
value. Then, it will send a signal
to the ADC, which will convert
the signal from analog to digital
for the computer to interpret.
Then it will send a signal to the
computer. The computer will
display the signal, showing that
there is a change in the value.
- Sensor
- Analog to Digital
Converter(ADC)
- Computer
- Computer
- Analog to Digital
Converter(ADC)
- Sensor
- The sensor detects a change in
value. Then, it will send a signal
to the ADC, which will convert
the signal from analog to digital
for the computer to interpret.
Then it will send a signal to the
computer. The computer will
display the signal, showing that
there is a change in the value.
- Close Loop
- The sensor detects a difference in the
system. Then, it will send a signal to the ADC,
which will convert the signal from analog to
digital for the computer to interpret. Then, it
will send a signal to the computer. The
computer will compare the original value
with the current value. Then, it will send a
signal to the DAC, which converts the signal
from digital to analog. Then, it will send a
signal to the actuator which will change the
current value to its original value.
- Sensor
- Analog To Digital Converter(ADC)
- Computer
- Digital To Analog Converter(DAC)
- Actuator
- Sensor
- Sensor
- Actuator
- Digital To Analog Converter(DAC)
- Computer
- Analog To Digital Converter(ADC)
- Sensor
- The sensor detects a difference in the
system. Then, it will send a signal to the ADC,
which will convert the signal from analog to
digital for the computer to interpret. Then, it
will send a signal to the computer. The
computer will compare the original value
with the current value. Then, it will send a
signal to the DAC, which converts the signal
from digital to analog. Then, it will send a
signal to the actuator which will change the
current value to its original value.
- Open-Loop
- Data Transfer
- Network Topology (for sharing of resources
and easy communication with each other)
- Star
- Adv - Easy to modify (add
or reduce no of computer)
- Disadv - More expensive because
all computers need to link to a
central location using cables
- Adv - Easy to modify (add
or reduce no of computer)
- Ring
- Adv - Reduce chances
of collision of data
- Disadv - If one computer fails, the
whole network is affected
- Adv - Reduce chances
of collision of data
- Bus
- Adv - Simple and easy to set up
- Disadv - Heavy traffic can slow
down the network because all
computers shares the main line
- Star
- Network Topology (for sharing of resources
and easy communication with each other)
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