OBJECTIVES Of all work stressors, occupational stress is the leading cause of many disorders among workers. Drivers are classified as a high risk group for work related stress. This study set out to determine the relationship between risk factors of cardiovascular diseases and occupational stress among drivers. MATERIAL AND METHODS Two hundred and twenty two Ilam's intercity drivers were sele...

How does isolation affect the economic activity of cities? Transport costs are widely considered an important barrier to local economic activity but their impact in developing countries is not well-studied. This paper investigates the role of intercity transport costs in determining the income of sub-Saharan African cities. In particular, focusing on fifteen countries whose largest city is a po...

Abstract The vital role that cities play in the governance of migration is increasingly recognized, yet scholars still perceive this ‘local turn’ as a recent phenomenon. This article presents cross-country and cross-city comparative analysis three mid-size European during post-war period: Bristol, Dortmund Malmö. It analyses administrative cultures local policy arenas, exposing complexity polic...

this study is a descriptive - survey and objective evaluation analysis of creation causes on informal settlement shadgholi-khan town of qom city. answer questionnaire by 200 protector of household in shadgholi-khan tow, economic, social and physical variables affective creation of informal settlements in the shadgholi-khan its spatial and local effects are investigated. research findings show t...

In this paper we deal with the vertex k-center problem, a problem which is a part of the discrete location theory. Informally, given a set of cities, with intercity distances specified, one has to pick k cities and build warehouses in them so as to minimize the maximum distance of any city from its closest warehouse. We examine several approximation algorithms that achieve approximation factor ...