Questions and Answers of Principles Of Embedded Networked Systems Design

Multihop communications of images The agricultural monitoring system of Problem 13.1 also includes a user requirement by which processed images and data are communicated via multihop links to the
System management protocol For the previous problem, develop a protocol for system management that enables the user to update the system operating schedule via a remote communication to the network
Energy harvesting Consider that the agricultural monitoring system of Problem 13.2 is equipped with solar cell technologies providing 20% efficient photovoltaic solar cell systems.Consider also that
The Caesar code The Virgine`re family of codes for the alphabet is specified by ci ¼ mi þ ki mod 26 wheremi is the numerical index of the letter in the alphabet (e.g., B¼2), and ki is a component
Unicity distance The length of text required to decode enciphered text uniquely when keys are randomly generated is known as the unicity distance.Denoting byH(K) the entropy of the key and by D the
Euclid’s algorithm Euclid’s algorithm can be used to find the gcd of two integers a andb. Suppose a>b and let {qi} and {ri} be integer quotients and remainders respectively. The algorithm rests
Factoring products of primes Two ways to decode a public key system are to try out all possible keys and to attempt to factor n¼pq, where p and q are both primes. Let p(x) denote the number of
Hash functions and sensing In message authentication codes, a family of hash functions hk, where k is the secret key, are employed. The properties of good families are:(1) Ease of computation of
The noisy sensor Consider the situation in Figure 14.4. Sensor nodes are laid out on a square grid of spacingd. Propagation losses go as the second power of distance. The source to be detected is
Network reconfiguration The rectangular grid in Figure 14.4 is also used for relaying. For the electronics used, it costs twice the energy of a hop between nearest neighbors (separated by distance d
Fighting infection Suppose nodes face a constant probability p of being infected (e.g., malfunctioning, taken over) in every time epoch. A mobile agent can visit 1% of the nodes in each epoch and
Information theft The compression approach in a sensor network has implications both for scalability and vulnerability to information theft. Consider the network depicted in Figure 14.5.Tier 1
Physical security An important component in the overall security of a system is the difficulty of physical access for theft or tampering. A rule of thumb is that the electronic and physical security
People and data reliability Data reliability also depends on the users/applications just as security depends on human involvement. List the ways in which confidence (i.e., trust/reputation) is gained

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