Wireless sensor networks

 

“Security enhancement of wireless sensor networks to enhance network lifetime using routing algorithms”

 

Sample Solution

Wireless sensor networks

Wireless sensor network (WSN) brings a new paradigm of real-time embedded systems with limited computation, communication, memory, and energy resources that are being used for a huge range of application. WSN is a group of spatially dispersed dedicated sensors to monitor/record an environment`s physical conditions and to organize collected data at a central location (Xiao 2004). Clustering in WSNs is an effective way to minimize the energy consumption of sensor nodes. In clustering, a sensor node in a cluster is elected Cluster Head (CH) and relays data from a sensor to a remote receiver. CH performs aggregation function on data received and sends it to BS where it is needed. Low Energy Adaptive Cluster Hierarchy (LEACH) is a popular routing protocol using cluster based routing to reduce energy consumption. LEACH divides communication into rounds with a round including a set-up phase and a steady-state phase.

While a set of frameworks complement and build on each other, the delineation of the concept focuses heavily on vertical versus horizontal dimensions in a time-sliced fashion. That is, time dimension in accountability has not been of primary importance. However, it is worth noting that the time dimension is closely interrelated with a series of conceptual distinctions made in previous literature, and it may cover complementary aspects of the question concerning two sequential lines represented by administrative responsibility versus political accountability. First, the positioning of accountability actors depends on the time dimension. Civil servants usually have longer terms to serve the public interest over the long term. At the same time, they are responsible to the elected representatives of the public who tend to have “a limited time horizon” and “prefer policies that yield tangible benefits for constituents in the near term” (Posner, 2004: 137). For this reason, the priorities expressed by elected officials may be far more related to short-term issues and temporal problems instead of long-term solutions, whereas the long-lasting forms of civil service personnel would prioritize sustainable solutions to secure a long-term perspective of the citizens, both current and in the future. Second, the time frame is essential to distinguishing between two main streams of accountability. Accountability mechanisms focus predominantly on retroactive accountability for the past outcomes, while accountability as a virtue takes a proactive approach to ensuring ethical behaviors in the future. The timeline is also useful to distinguishing between ex ante accountability of the decision-making process leading up to the decision and ex post accountability where the results available from the decision already taken or where questions of compliance are identified and addressed. In other words, ex ante accountability refers to being accountable for the decision before an administrator act, while ex post accountability is suggestive of situations where administrators are accountable for the outcome of their decisions. For example, the focus of traditional bureaucratic administration is very much

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