Sharif Digital Repository

Wars are destructive and ruin lives. However, when it comes to defending one’s home country and religion, the brilliant aspects of sacrifice are highlighted. The 1980 war between Iran and Iraq, which lasted eight years and cost more than 200,000 lives, is a prime example of such sacrifices. Religions demand sacrifices and create club goods like altruism, cooperation, and effort, which are crucial on the battlefield. Religious institutions, like the Imamzadehs in Iran, strengthen people’s faith and play a significant role in these sacrifices. About eight thousand Imamzadehs in Iran are tombs of the grandchildren of Prophet Muhammad, who left the Arab land seeking a peaceful life among... 

Polypropylene (PP) is a fast growing polymer, particularly in automotive industry, where PP compounds have replaced many different parts made of conventional materials. In the first step, PP-g-MA, as compatibilizer, was synthesized. Two kinds of polypropylenes including a homo- and a block co-polymer were incorporated for this goal. Characterizations via titration and FTIR tests revealed higher degree of grafting reaction when homo-polymer was used for synthesizing PP-g-MA. In the next step, nanocomposites containing 3 wt% nanoclay with three different PP-g-MA/nanoclay ratios of 1:1, 2:1 and 3:1were made using a co-rotating twin screw extruder. Tensile, impact and XRD tests were performed to... 

Due to recent prevalence of error resilient applications (e.g., multimedia, artificial intelligence, etc.), approximate computing (AC) has become a promising paradigm for low power and high performance designs. A significant amount of research in AC has been focused on improving the power and performance by approximating arithmetic units. However, memories i) are also a major contributor to the overall energy consumption (e.g., 30% to 60%) and response time of a system, and ii) result in perceivable quality degradation when used approximately. In this thesis, we employ the predictability potential of embedded systems in order to enable quality-aware exploitation of the advantages of the... 

There are many archeological sites, historic building monuments and inscriptions in Iran and other countries in the world which have been damaged by environmental as well as biological causes. Lichens are one of the biological causes which, through their growth, bring about change and damage to the stones. Different methods, each of which has both advantages and disadvantages, have been used in order to deal with the problem. Since there are many historic buildings in our country which have been damaged by different biological causes including the lichens, doing a research on the topic seems to be quite significant and necessary. The Persepolis is among one of the most important historic... 

GPUs are used today to accelerate a wide range of general-purpose applications (e.g., regular stencil applications and irregular graph processing applications). Due to the significant growth of the Thread Level Parallelism (TLP) in GPGPU applications, the need for data sharing between different threads has become more apparent. There are a variety of solutions for reusing data in the GPU (e.g., on-chip caches and shuffle instructions), each with its own drawbacks and reduced comprehensiveness (e.g., limiting shared memory to a thread block and shuffle instructions to a warp). Among the standard general-purpose applications, L1 data cache is a major GPU solution for reusing data among... 

Internet is the largest multi-purpose, self-reliant, complex and distributed computer network across the globe. The nodes of this network are placed in every place like homes, offices, military camps, schools and all other locations by utilizing many different communication protocols, media and capacities. Furthermore, by rapid technology development, there are many newly born applications utilizing internet in new ways such as Internet of Things systems. The explosive growth of technology causing accelerated addition of new nodes to the internet, and any new single node may have several new unpatched vulnerabilities. This is a serious issue for managing this vast chaotic configuration and...