For the arraylist's underlying data storage mechanism you will use the built-in python list, constrained so that only the following operations (as would be supported by a primitive array) are available: lst[i] for getting and setting a value at an existing, positive index i len(lst) to obtain the number of slots lst. append(none) to grow the list by one slot at a time del lst[len(lst)-1] to delete the last slot in a list constrained least to keep us honest, we've defined an api-constrained sub-class of the built-in list -- constrained set -- an instance of which is assigned to the data attribute of each arraylist. you should not change the definition of constrainedlist, and ensure that your arraylist implementation never assigns a regular python list to its data attribute. so long as you use constrainedlist in your implementation, you can be certain you're not performing any "illegal" operations (i. e., outside the constraints established above). if you invoke a disallowed operation, an appropriate exception will be raised.

Consider a slotted aloha system, where the time slot equals the fixed duration of each packet. assume that there are 4 stations a, b,c, d sharing the medium. (a) stations a, b,c, d receive one packet each from higher layers at times 1.3, 1.5, 2.6,5.7 respectively. show which transmissions take place when, according to the slottedaloha protocol; describe all transmissions until all four packets have been successful. when needed, each station has access to the following sequence of random number, provided by a random number generator and drawn uniformly between 0 and 1: (1) station a draws numbers: 0.31, 0.27, 0.78, 0.9, 0.9, 0.11, 0. (2) station b draws numbers: 0.45, 0.28, 0.11, 0.83, 0.37, 0.22, 0. (3)station c draws numbers: 0.1, 0.2, 0.3, 0.4, 0. (4) station d draws numbers: 0.36, 0.77, 0.9, 0.1, 0.1, 0.1, 0.1, 0. (b) in slotted aloha, a station transmits in each time slot with a given probability. what probabilities would you assign to each of the four stations so as to: (i) maximize the efficiency of the protocol? (ii) maximize fairness among the four stations? (c) will the efficiency increase or decrease if we modify slotted aloha as follows: (i) get rid of slots and allow stations to transmit immediately? (ii) implement carrier sensing? (iii) implement collision detection? (iv) implement collision avoidance?

List the five on-board vehicle subsystems

What is used to analyze and summarize your data without graphical support