Write an essay of 400 to 500 words on The Business Impact of COVID-19 in Taiwan. You will be graded based on the number of words, content, organization, grammar, vocabulary, paragraphing, punctuation, as well as style.（100%）

1. (10%) What would be the output of the following C program? (Note that the line numbers are for reference only.)

(a) (2%) FCFS

(b) (2%) LOOK

(c) (2%) C-LOOK

(d) (2%) SCAN

(e) (2%) C-SCAN

3. (10%) A computer whose processes have 2048 pages in their address spaces keeps its page tables in memory. The overhead required for reading a word from the page table is 500 nsec. To reduce this overhead, the computer has a TLB, which holds 32 (page, frame) pairs and can do a lookup in 50 nsec. What hit rate is needed to reduce the mean overhead to 150 nsec or less, assuming that TLB is looked up first before the page table is read?

(a) (5%) What would be the size of the smallest file allowed in bytes?

(b) (5%) What would be the size of the largest fle allowed in bytes?

(a) (5%)  

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