Sharif Digital Repository

In the last decade, participation of hundreds of millions of users in social networks, has turned social networks into a powerful tool to steer the flow of information. As a result, the study of different aspects of these networks has become one of the indispensable interests of many researchers. One of the most important research problems in social network analysis is the community detection problem. From structural point of view, a community is a set of nodes with more internal links than external links, and from behavioral point of view, a community is a set of nodes with similar attributes and features. Most of previous works on community detection have focused on the structure of the... 

Optimizing multi-period modern distribution system is a challenging task due to high costs of constructions in urban areas and importance of fast and cheap goods delivery to customers. Various logistic techniques have been proposed to solve this issue. In this study, a new method is suggested to convert the strategic problem of finding depot location into a tactical problem. In addition, a vehicle routing method for multi-period distribution systems in high demand periods have been developed. For modeling this location-routing problem two objective functions have been considered as fallows minimizing the total time in the system to satisfy customer demand and operating costs. To solve this... 

Blockchain technology, which is known as a technology in the financial sector, has many benefits for non-financial industries and supply chains. Two of the main advantages of blockchain are smart contracts and decentralized decision-making. These two features can effectively achieve the goals of Industry 4.0. Furthermore, this technology increases transparency, resulting in increased efficiency in supply chains, reduced operational costs, and increased control and supervision. In this study, the problem of production-distribution planning in cloud architecture is examined as an example of a cloud supply chain problem, and a blockchain-based architecture is proposed for service composition in... 

The ultimate aim of this research is optimizing high- performance Horizontal Axis Wind Turbine (HAWT) associated with using Computational fluid dynamics (CFD) to predict the flow behavior over wind turbine blades. Computational prediction of the flow over wind turbines is a challenging numerical problem because of the complicated aerodynamics and large variation in length scales. Phenomena such as; the unsteady flow, vortex shedding of the blade tips, flow separation, complicated blade geometry due to variable twist and chord and changes in angle of attack, and highly turbulent flow over blade sections makes CFD prediction challenging, as well as interesting. The goal is to gain an in depth...