Sharif Digital Repository

Nowadays, in communication industry, specially data network, in which service quality is a serious parameter, request for making connection with appropriate quality (Proportionate to demands) and necessity of clarification of obligations of service providers and customers, as well as customer awareness of submitted materials and offering various services with different qualities & costs, led service providers, specially IP based networks, to make agreements with their customers, entitled service Level Agreement (SLA). The SLA specifies the service type, mutual obligations, related parameters, measuring methods, violation threshold, penalties and loss compensation. Whereas, applying... 

In this era of competitive markets, firms and organizations can survive that have a competitive advantage through their business models. Having a competitive business model and its frequently evaluation is one of the secrets of success. Another, especially of these days, is digitalization of many businesses. Every day in our business environment new digital businesses are establishing. Conversely emergence of the Internet affected many of current businesses, then this question be arose that, what and how this phenomena can affect the current business models? Abstract (Max. 300 words for M.S and 500 words for Ph.D. theses) In this research we will check this affect on the automobile after... 

Internet and the market based on this new product and service has penetrated in all aspects of today’s modern life of human being. After invention of this market each day a new innovation revolutionized this market and industry. High speed internet based on ADSL technology was one of these innovations. The high-speed internet service has achieved a remarkable increase in penetration in recent years. In order to survive in this competitive market, companies should continue to improve their service performance. The high level of service performance is believed to be an effective way to improve customer satisfaction and loyalty. In recent years, the high-speed internet service, based on the... 

Active queue management (AQM) is a key factor in congestion control and should provide appropriate feedback for flow control in traffic sources to overcome the congestion problem. Beside providing congestion control, achieving predictable queuing delay, maximizing link utilization, simplicity and robustness are also the main objectives of an AQM controller. We propose in this thesis an improved queue dynamic model while incorporating the packet drop probability as well. The proposed model is evaluated using ns2 platform. By applying the improved model, a new compensated proportionalintegral- derivative (PID) AQM controller is developed for TCP network. The time-varying nature of the network... 

Cultural and social problems in the modern age have motivated many thinkers to analyze modernity. Some of them have tried to solve these problems and, if possible, prevent their occurrence in the future. Proposed solutions are mostly dystopian, i.e. by being disappointed, they think the only possible way to overcome these problems is to annihilate modern civilization, or they pursue a passive approach; i.e. they have accepted the problems of modernity but only seek a way to mitigate its challenges. Among these, solutions which try to make use of the capacities of the modern civilization, especially emerging technologies, are really scarce. These approaches seek to realize (and make...