Modeling And Formal Specification Of Air Traffic Control System Using Z Notation

Maryam Jamal,Nazir Ahmad Zafar

doi:10.31384/jisrmsse/2007.05.2.2

Abstract

In this paper, an abstract Air Traffic Control (ATC) System is modeled using Formal Methods, in terms of Z-notation. ATC system is a highly distributed and safety critical system. For modeling of distributed nature of ATC system, a separate queue of flying aircrafts is maintained at each controlled airspace. To ensure safety, it is mandated that each airspace and runway do not exceed its capacity limit in all state operations. Firstly, Requirements Analysis is done using UML diagrams and then the Formal ATC system Model is described by Z-notation. Finally, the Formal ATC system Model is checked and analyzed with Z/EVES tool-set.

Highlights

The knowledge of the relationship between stock prices and economic growth is becoming more important in the case of developing countries in view of the various economic reforms taking place there
Fazal Husain and Tariq Mahmood (1999) find a uni directional causality running from Money Supply to Stock Prices in Pakistan. [4]
This paper examines the causal relationship between the money supply, a tool of monetary policy, and stock prices in Pakistan economy

Summary

Introduction

The knowledge of the relationship between stock prices and economic growth is becoming more important in the case of developing countries in view of the various economic reforms taking place there. Starting in the beginning of the 1990s there have been a number of measures taken for economic liberalization, privatization, relaxation of foreign exchange controls, and in particular the opening of the stock markets to international investors. These measures resulted in significant improvements in the size and depth of stock markets in developing nations and they are beginning to play their due role. Regarding causal relation between stock prices and economic activity Mookerjee (1988) finds evidence that GDP leads stock prices in India [1] whereas Nishat and Saghir (1991) find the opposite evidence in Pakistan [2]. Fazal Husain and Tariq Mahmood (1999) find a uni directional causality running from Money Supply to Stock Prices in Pakistan. [4]

Objectives

Methods

Conclusion