Final

Question 1

embedded system

Answer 1

A computer system with a dedicated function within a larger electrical or mechanical system.

Question 2

Moore’s Law

Answer 2

The number of transistors on a chip doubles every 2 years

Question 3

Wireless Sensor Networks

Answer 3

• Sensor : converts physical phenomenon
• Sensor Node : basic unit, embedded system
• Sensor Network : large # of sensor nodes, implements protocols

Question 4

Characteristics of Wireless Sensor Networks

Answer 4

• mainly consist of sensors which are: low power, limited memory, energy constrained
• self-organized / healing

Question 5

Wireless Sensor Networks Design Challenges

Answer 5

• heterogeneity
• distributed processing
• low communication bandwidth

Question 6

Wireless Sensor Networks Operational Challenges

Answer 6

• energy efficiency
• limited storage
• low bandwidth
• errors are common
• scalability

Question 7

Trilateration

Answer 7

Determining absolute location using distance from three or more known locations

Question 8

System Characteristics

Answer 8

1. Real-time
2. Low Power
3. Low Cost

Question 9

Hard real time

Answer 9

Missing a deadline results in failure

Question 10

soft real time

Answer 10

missing deadline results in degraded performance

Question 11

design methodologies

Answer 11

1. requirements
2. specification
3. architecture
4. component design
5. system integration

Question 12

functional requirement

Answer 12

output as a function of input

Question 13

non-functional requirement

Answer 13

A requirement that does not relate to functionality, but to attributes such as reliability, efficiency, usability, maintainability and portability.

Question 14

requirements form

Answer 14

name
purpose
inputs
outputs
functions
performance
manufacturing cost
power
physical size/weight

Question 15

specification

Answer 15

more precise description of system, may include functional and non-functional elements