Sharif Digital Repository

Virtualization is one of the widely used technologies which has enhanced the utilization of the hardware resources and made the computer management easier. Cloud computing is one of its appealing application providing various electronic services in the form of virtual machines to users. A common security threat in the virtual machines in cloud services is the vulnerabilities the programs and operating systems have. Attackers can take the advantage of these vulnerable machines and abuse them to carry out attacks. Virtual Machine Introspection (VMI) techniques are proposed and used by the cloud providers utilizing the management capabilities in the hypervisor to intercept hardware accesses and... 

To improve the quality of Android apps, developers use automated debugging and testing solutions to determine whether the previously found crashes are reproducible. However, existing fuzzing solutions for Android apps struggle to reproduce crashes efficiently based solely on a crash stack trace. This trace provides the location in the app where the crash occurs, and lack information about the GUI events and necessary device settings. Hence, these solutions confront scalability and event explosion in searching vast sequences of GUI events and setting device states. In the first solution, we propose a directed-based fuzzing solution to reduce an app's event domain to the necessary ones to... 

In this study, the revolving door effect on the bank’s performance is investigated through two paths: return on assets as an expression of banks' performance and capital adequacy ratio as a bank financial health indicator and the quality of central bank supervision. We assume these two variables are affected by conflict of interest. The form of conflict of interest used in this research is revolving doors. The board directors of commercial banks, who have previously worked in the central bank, create conflict-of-interest data. Twenty-seven commercial banks were investigated in this research between 2012 and 2022. the conflict-of-interest gap variable was defined in order to separate the... 

Advanced Driver Assistance System (ADAS) is a major area of research in today’s vehicle control and safety. In General ADAS can be seen as a mother system with various subsystems to help the driver from pre-crash to post-crash situations. One of the subsystems for ADAS is the Collision Avoidance System (CAS). Nowadays, many researchers are working on different Aspects of CAS, from perception to decision making. Many challenges exist while developing a CAS, but today the greatest challenge is decision making of CAS and its interaction with driver’s behavior. Driving is a complex task and since driver’s consciousness, gender, age and reflexes can cause different behaviors; it is, therefore,... 

Primary visual cortex plays a paramount role in processing visual information. Visual information after the primitive processing by LGN and Thalamus, will be sent to the primary visual cortex which is called V1 area. According to the fact that V1 neurons have the definitive sensitivity to the edge and contrast of visual stimuli so their behavior are very selective to the certain features, specially contrast, of visual stimuli. These neurons have different response behavior to contrast. In fact most of them have some nonlinear behavior to this feature. Normally we expect that response of them or spiking rate of them grow linearly by the contrast increases but in most many cases they have some...