Suppose you want to send N 100-byte messages over 8 hops. In order to find the minimum message transmission time, you may need to break up each message into M number of packets. Each packet requires a 5-byte header. Assume it takes 1 ns to transmit 1 byte of data. Using your favorite programming language, write a program to calculate the transmission time for message size M = 1 to 50 packets(a) The packets in a message must end at a byte boundary.(b) For example, if M = 3, then the message will be split into two 33-byte packets and one 34-byte packet. It cannot have three 33 1/3 byte packets. Tabulate message size (# pkts) and transmission time (ns). Plot transmission time vs message size (# pkts) What is the minimum transmission time? What is the associated value of M?

Acommercial grade cubical freezer, 4 m on a side, has a composite wall consisting of an exterior sheet of 5.0-mm thick plain carbon steel (kst= 60.5 w/m k), an intermediate layer of 100-mm thick polyurethane insulation (kins 0.02 w/m k), and an inner sheet of 5.0- mm thick aluminium alloy (kal polyurethane insulation and both metallic sheets are each characterized by a thermal contact resistance of r 2.5 x 104 m2 k/w. (a) what is the steady-state cooling load that must be maintained by the refrigerator under conditions for which the outer and inner surface temperatures are 25°c and -5°c, respectively? (b) for power saving purpose, which wall material should be increased/reduced in. thickness in order to reduce 50% of the cooling load found in part (a)? redesign the thickness of the proposed material. 177 w/m-k). adhesive interfaces between the q=575.93 w