Search

The paper focuses on the application of fuzzy logic as a Multi-Criteria Decision Making (MCDM) method to develop an idea of a managerial tool that can predict accidents in different industries. Accidents in industries are not directly dependent on the amount of expenses in different relevant sectors. Fuzzy logic enables us to quantify the opinion of experts with many years of experience and combine those quantified opinions with other parameter affecting the occurrence of accidents in industries which in this case are the amount of expenses in different relevant sectors. This combined assessment generates a relationship between the occurrence of accidents and the amount of expenses in different relevant sectors. The tool will help management to mitigate accidents which is more preferable than reacting to accidents.

As a promising broadband wireless technology, WiMAX has many salient advantages over such as: high data rates, quality of service, scalability, security and mobility. Many sophisticated authentication and encryption techniques have been embedded into WiMAX but it still facing a lot of challenging situations. This paper shows different security vulnerabilities found in IEEE 802.16e and gives possible solutions to eliminate them. These vulnerabilities are the possibilities to forge key messages in Multi- and Broadcast operation, some unauthenticated messages which are susceptible to forgery and the unencrypted management communication which reveals important management information. We modify DH key exchange protocol to fit it into mobile WiMAX network as well as eliminate existing weakness in original DH key exchange protocol.