IST 195 Exam 2 Study Guide

IST 195 Exam 2 Study Guide - IST 195 Exam 2 Study Guide...

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Unformatted text preview: IST 195 Exam 2 Study Guide Lossy Compression Our ears can detect certain frequencies and certain patterns Discard what we cannot hear Difference between WAV and MP3 Time (seconds) x Sampling Rate x Number of Channels More??? Bits & Bytes 1 bit = 2 values (1 or 0) 2 bits = 4 values (10 01 11 00) 3 bits = 8 values (000 010 001 011 100 110 111 101) 4 bit = 16 values 5 bit= 32 values 6 bit = 64 values 7 bit =128 values 8 bit = 256 values also known as a byte Decimal vs. Binary Decimal – Base 10 Binary – Base 2 256 128 64 32 16 8 4 2 1 Storage Capacities Binary Arithmetic ASCII vs. UNICODE Unicode represents all characters, not just English ASCII 7 bit (128 values) Takes care of 0-9 A-Z, a-z and punctuation Unicode More than 100,00 characters Universal Character Set Includes ASCII Prefixes Kilo Mega Giga Tera Peta Exa Need to know values? Functions of Operating systems CPU Managements Program Management Memory Management File System Management Device Management User Management Operating Systems Manage hardware and software resources Acts as an intermediary between the two Kernel Central component of an OS and manages memory, order of processes are executed, and how information is received and sent to devices (i.e., keyboard) GUI – graphical user interface More? Layers User Application Operating System Hardware Types of O/S Single-user Home system Multi-user Corporate Server Environment Mutli-tasking vs. Single-tasking Single Tasking – user intervention required to change from task to task Mobile O/S iOS, Android, Windows Phone, Blackberry People behind Operating Systems Bill Gates – Windows Ken Thompson – Unix Steve Jobs – Apple Linus Torvalds – Linux Ken Thompson Co-invented the UNIX O/S and the C programming language “led to enormous advances in computer hardware, software, and networking systems and stimulated growth of an entire industry, thereby enhancing American leadership in the Information Age” Multitasking Cooperative Multi-Tasking – processes voluntarily give up CPU control to other processes from time to time Pre-Emptive Multi-Tasking – the OS kernel guarantees each process some operating...
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This note was uploaded on 02/07/2012 for the course IST 195 taught by Professor Staff during the Spring '08 term at Syracuse.

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IST 195 Exam 2 Study Guide - IST 195 Exam 2 Study Guide...

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