1. 도스와 유닉스 구조및 유사점과 차이점 2. 컴퓨터 네트워크 다중 송신 시스템(영어 리포트 - 영국)

소개

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영어로 assignment 작성에 어려움을 겪으시는 분들 많은 도움 되었으면 합니다.

(Task 1)
Describe the structure of MS-DOS and UNIX operating system. Comment on the similarities and differences between them.

(Task 2)
Transmission facilities are often expensive and communicating systems do not always use the fell capacity of the data channel. Therefore, significant economies can be achieved by sharing transmission facilities, a process called multiplexing. You should describe the principles of the three multiplexing schemes most commonly used in computer communication networks.

목차

Task 1 ① The Structure of UNIX …………………………….2
② The Structure of DOS …………………………….4
③ Differences between DOS and UNIX …………………………….6
④ Similarities between DOS and UNIX …………………………….7

Task 2 ① The Definition of Multiplexing …………………………….9
② The Principles of the three multiplexing schemes ……………………………11

⒜ FDM ……………………………11
⒝ TDM ……………………………12
⒞ STDM ……………………………13

Reference ……………………………14

본문내용

(Task 1)
Describe the structure of MS-DOS and UNIX operating system. Comment on the similarities and differences between them.


① The Structure of UNIX

⒜ The Operating System

Unix is a layered operating system. The innermost layer is the hardware that provides the services for the OS. The operating system, referred to in Unix as the kernel, interacts directly with the hardware and provides the services to the user programs. These user programs don`t need to know anything about the hardware. They just need to know how to interact with the kernel and it`s up to the kernel to provide the desired service. One of the big appeals of Unix to programmers has been that most well written user programs are independent of the underlying hardware, making them readily portable to new systems. User programs interact with the kernel through a set of standard system calls. These system calls request services to be provided by the kernel. Such services would include accessing a file: open close, read, write, link, or execute a file; starting or updating accounting records; changing ownership of a file or directory; changing to a new directory; creating, suspending, or killing a process; enabling access to hardware devices; and setting limits on system resources. Unix is a multi-user, multi-tasking operating system. You can have many users logged into a system simultaneously, each running many programs. It`s the kernel`s job to keep each process and user separate and to regulate access to system hardware, including cpu, memory, disk and other I/O devices.

참고자료

· Clements, Alan / Computer System Architecture : Themes And Variations / John Wiley & Sons Inc / 09-2007