Thomas Kunz
Systems and Computer Engineering
23
Effects of device portability
nPower consumption
–limited
computing power, low quality displays, small disks due to limited battery capacity
–CPU: power
consumption ~ CV2f
nC: internal capacity, reduced by integration
nV: supply voltage, can be reduced to a certain
limit
nf: clock frequency, can be reduced temporally
nLoss of data
–higher
probability, has to be included in advance into the design (e.g., defects, theft)
nLimited user interfaces
–compromise
between size of fingers and portability
–integration
of character/voice recognition, abstract symbols
nLimited memory
–limited
value of mass memories with moving parts
–flash-memory
or ? as alternative