Contoh Pervasive DS

Q: We already gave some examples of distributed pervasive systems: home systems, electronic health-care systems, and sensor networks. Extend this list with more examples.
Distributed Pervasive Systems
• Observation
Emerging next-generation of distributed systems in which nodes are small, mobile, and often embedded in a larger system.
• Some requirements
1. Contextual change: The system is part of an environment in which changes should be immediately accounted for.
2. Ad hoc composition: Each node may be used in a very different ways by different users. Requires ease-of-configuration.
3. Sharing is the default: Nodes come and go, providing sharable services and information. Calls again for simplicity.
• Examples
1. Home Systems
Justifications
o Rapid advances in component technologies
 Smart gadgets, wearable sensors and actuators, robotic helpers, mobile devices
 Wireless, wideband interconnects
o Increasing critical needs due to
 Aging baby-boom generation
 Long life expectancy
 New safety, security, and privacy concerns

2. Electronic health systems
3. Sensor networks
Characteristics
Environment
o Connect to physical environment (large numbers, dense, real-time)
o Sensor nodes are prone to failures, non-deterministic
o Wireless communication
o Massively parallel interfaces (to users and applications)
o Limited resources: battery, bandwidth, memory, CPU (power management critical)

Network
o Topology changes dynamically
o Sporadic connectivity
o New resources entering/leaving
o Large amounts of redundancy
o Self-configure/re-configure


Answer :
- cellular telephone system
resources shared : radio frequency, transmission time in a single frequency mobile
- Laptop computers, ubiquitous computing
- Handheld devices, PDA, etc