ANSWER ALL THE QUESTIONS CAREFULLY

Section A

Operating Systems As nicely as storage and retrieval of facts, the capabilities of a submitting machine consist of: ? naming and call resolution ? get right of entry to manage ? lifestyles manipulate ? concurrency manage For every of the above (a) Briefly outline the function. [1 mark each] (b) Discuss how, and wherein submitting system factor, the feature may be furnished. Use examples from one or extra real operating systems to illustrate your solution. [4 marks each] 6 CST.Ninety eight.1.7 12 Operating Systems What is supposed with the aid of the term demand paging in a virtual memory control system, and how is it implemented? [5 marks] List 5 strategies which the running gadget can use to enhance the efficiency of demand paging. [5 marks] Suppose the page desk for the currently executing manner is as follows. All values are decimal, and indexes are numbered from zero. Addresses are reminiscence byte addresses. The page offset is 10 bits. Virtual Page # Valid bit Reference bit Modify bit Page Frame # 0 1 1 zero four 1 1 1 1 7 2 0 zero 0 - three 1 zero zero 2 4 zero zero zero - 5 1 0 1 zero Describe precisely how, in general, a virtual deal with generated through the CPU is translated right into a bodily cope with, with the useful resource of a diagram. [4 marks] To what physical deal with (if any) would the subsequent digital addresses correspond? (a) 1052 (b) 2221 (c) 5499 [6 marks]Consider the own family of 1-dimensional Gabor wavelets, parameterised for place x0, size ?, and frequency 0. Their functional shape is: f(x) = e ?i0x e ?(x?x0) 2 /?2 and their Fourier Transform is: F() = e ?ix0 e ?(?0) 2? 2 (a) Explain the dualities of: (i) modulation and moving; and (ii) similarity (reciprocal scaling), in phrases of the behaviour of the parameters in the expressions above for f(x) and F(). [4 marks] (b) What can you are saying about the Fourier transform of the sum of any two Gabor wavelets? [4 marks] (c) What can you say about the Fourier transform of the made of any Gabor wavelets, and why? [4 marks] (d) What is the Fourier transform of f (n) (x), the n th-spinoff of a Gabor wavelet? [4 marks] (e) Show that the set of all Gabor wavelets is closed under convolution: i.E., that the convolution of any two Gabor wavelets is itself a unmarried Gabor wavelet. [4 marks] 1 [TURN OVER CST.98.4.2 2 Concurrent Systems In a device which allocates sources dynamically (a) What are the aid allocation rules that make it important to recall the possibility of impasse? [3 marks] (b) If there is one instance of every resource type what's the important and sufficient circumstance for impasse to exist? [2 marks] Using the notation ? for an instance of a aid R ? ? > P method P has an example of useful resource R R ? ?

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2. Eastern and Western are countries that currently produce electronics and food. Each country has 100 million labor hours, and the amounts of labor required to produce each kilo of electronics or food are shown in the table below. Hours of Labor Required for Production Eastern Western Electronics (per kilo) 1.25 hours 1.50 hours Food (per kilo) 1.00 hours 2.00 hours Total Hours Available 100 million 100 million A. [1 point each] In autarky, What is the price of electronics relative to the 1.25/1.00 price of food (Pelectronics / Pfood) in Eastern? -1.25 Eastern produces and consumes 32 million 32*1.25 - 40 m hours producing kilos of electronics. How many kilos of food electronics, leaving 60 m to produce food does it produce and consume? amounting to 60/1 60 million food What is the price of electronics relative to the 1.50/2.00 price of food (Pelectronics / Pfood) in Western? -0.75 Western produces and consumes 30 million 30*2 -60 m hours producing food. kilos of food. How many kilos of electronics leaving 40 m to produce electronics does it produce and consume? amounting to 40/1.5 - 26.67 m electronics B. [1 point each] Eastern and Western begin to trade electronics and food. Each country specializes in the production of the good in which it has comparative advantage. Trade takes place at the exchange rate of 1:1. In other words, Pelectronics / Pfood - 1. After trade, 35 million kilos of electronics are traded for 35 million kilos of food. Fill in the table below showing production and consumption in Eastern and Western after free trade Eastern Western Production Consumption Production Consumption Electronics 0 35 100/1.5 66.67 -35 (millions of kilos) (from imports) 66.67 31.67 Food 100/1 100 -35 -65 0 35 (millions of kilos) 100 (from imports) search2. Eastern and Western are countries that currently produce electronics and food. Each country has 100 million labor hours, and the amounts of labor required to produce each kilo of electronics or food are shown in the table below. Hours of Labor Required for Production Eastern Western Electronics (per kilo) 1.25 hours 1.50 hours Food (per kilo) 1.00 hours 2.00 hours Total Hours Available 100 million 100 million A. [1 point each] In autarky, What is the price of electronics relative to the 1.25/1.00 price of food (Pelectronics / Pfood) in Eastern? -1.25 Eastern produces and consumes 32 million 32*1.25 - 40 m hours producing kilos of electronics. How many kilos of food electronics, leaving 60 m to produce food does it produce and consume? amounting to 60/1 60 million food What is the price of electronics relative to the 1.50/2.00 price of food (Pelectronics / Pfood) in Western? -0.75 Western produces and consumes 30 million 30*2 -60 m hours producing food. kilos of food. How many kilos of electronics leaving 40 m to produce electronics does it produce and consume? amounting to 40/1.5 - 26.67 m electronics B. [1 point each] Eastern and Western begin to trade electronics and food. Each country specializes in the production of the good in which it has comparative advantage. Trade takes place at the exchange rate of 1:1. In other words, Pelectronics / Pfood - 1. After trade, 35 million kilos of electronics are traded for 35 million kilos of food. Fill in the table below showing production and consumption in Eastern and Western after free trade Eastern Western Production Consumption Production Consumption Electronics 0 35 100/1.5 66.67 -35 (millions of kilos) (from imports) 66.67 31.67 Food 100/1 100 -35 -65 0 35 (millions of kilos) 100 (from imports) search5. A class at BCU contains 43 students. Each of them takes computing or electronics or both. 32 students take computing and 18 take electronics. In addition, 7 of the students have chosen to take an exciting new option, data analysis III. If 5 of these 7 take computing and another 5 take electronics, answer the following questions: How many students take all three subjects? (b) How many take both computing and electronics? (c) How many students take just one subject