An elevator is described. The following definition is given by the elevator. Each elevator has a set of m buttons, one for each floor. These illuminate when pressed and cause the elevator to visit the corresponding floor. The illumination is canceled when the elevator visits the corresponding floor. Each floor, except the first floor and top floor has two buttons, one to request and up- elevator and one to request a down-elevator. These buttons illuminate when pressed. The illumination is canceled when an elevator visits the floor and then moves in the desired direction. When an elevator has no requests, it remains at its current floor with its doors closed. The basic course of Action for elevator scenario: • Passenger presses floor button (that is the button on the wall). • Elevator system detects floor button pressed. • Elevator moves to the floor. • Elevator doors open. Passenger gets in and presses elevator button (that is the button in the cabin panel). Elevator doors close. • Elevator moves to required floor. • Elevator doors open. • Passenger gets out. Elevator doors close.

An elevator is described. The following definition is given by the elevator. Each elevator has a set of m buttons, one for each floor. These illuminate when pressed and cause the elevator to visit the corresponding floor. The illumination is canceled when the elevator visits the corresponding floor. Each floor, except the first floor and top floor has two buttons, one to request and up- elevator and one to request a down-elevator. These buttons illuminate when pressed. The illumination is canceled when an elevator visits the floor and then moves in the desired direction. When an elevator has no requests, it remains at its current floor with its doors closed. The basic course of Action for elevator scenario: • Passenger presses floor button (that is the button on the wall). • Elevator system detects floor button pressed. • Elevator moves to the floor. • Elevator doors open. Passenger gets in and presses elevator button (that is the button in the cabin panel). Elevator doors close. • Elevator moves to required floor. • Elevator doors open. • Passenger gets out. Elevator doors close.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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