Index 355
Querying
information-driven sensor, 98, 136,
146–152, 187
physical environment, 195–197
standardized query language for, 190, 195
R trees, 220
Radiofrequency signals, 7
Range queries
definition of, 213
description of, 199–200
example of, 228
Range searching
nonorthogonal, 221–223
orthogonal, 217–221
partial data aggregation for, 217
Ranging, 119–120
Real-Time A*, 179
Received signal strength, 119, 125–126
Receiver operating characteristic, 60
Recursive algorithm, 124
Recursive geographic forwarding, 91
Reference broadcasts, 115–117
Refresh packets, 100
Region, energy-aware routing to, 87–91
Relative neighborhood graph, 79–80
Representation
discrete samples, 41–42
distributed, 38–45
measurement-based, 40–41
parametric, 39–40
selection of, 38–42
Responsible trigger, 281
Restricted flooding, 91
RFIDs, 295–296
Root-mean-squared amplitude, 52
Routing
to a region, 87–91
attribute-based, 91–100
clustering algorithm before, 75–76
compass, 72
convex perimeter, 76
definition of, 18
description of, 70–72
directed diffusion, 92–96
energy-minimizing broadcast, 83–87
geographic hash tables, 99–101
geographical and energy-aware, 88–89
graph planarization, 76–80
greedy distance, 72
greedy perimeter stateless, 76
multistep information-directed, 174–179
on a curve, 81–83
perimeter, 77–78
rumor, 97–98
unicast geographic, 72–81
Routing tree, 207
Rumor routing, 97–98
Security and surveillance applications,
299–300
Self-localization, 118
Sensing
global phenomena, 185–187
methods of, 138
purpose of, 167
task-driven, 136–138
Sensing model, 28–30
Sensing principal, 281
Sensor
definition of, 17
high-data-rate, 303–304
networking of. See Networking sensors
selection of, 142–146, 144f, 321–322
signal processing modules on, 192
Sensor group management, 179–185
Sensor net stack, 44
Sensor networks
advantages of
detection, 8–9
energy, 7–8
overview of, 6–7

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