Sharif Digital Repository

Since ancient time, healing patients suffering from bone deformities has been one of the most important challenges of physicians. In recent decades, by helping bio mechanic engineers external fixators has been used for this purpose. These fixators divided to parallel and series forms. One of the remarkable merit of parallel external fixators is their high maneuverability. These fixators usually have six degree of freedom, and follow the movement’s pattern of Stewart robots. In this project by studying different fixators which has been commercials, we present two conceptual models of these fixators which three and four legs are used for connecting the lower and upper plates, respectively. The... 

In the complex and dynamic world of today's communication networks, Software-Defined Networking (SDN) with its flexibility and programmability has opened new horizons in network management. These networks, by decoupling the control plane from the data plane, enable centralized and efficient management. Despite these advantages, optimizing routing in these networks remains a significant challenge, and increased latency in SDNs due to centralized processing in the controller and communications between switches and controllers is a critical issue that can severely impact the quality of service. Traditional routing methods face numerous challenges due to their static nature and lack of... 

Fog computing is essentially the expansion of cloud computing towards the network edge, reducing user access time to computing resources and services. Various advantages of fog computing, including reduced latency, improve user experience; however, user mobility may limit the benefits of fog computing. By moving users from one location to another, their distance from a fog service and consequently the latency may increase. One solution to maintain latency within an acceptable range is the migration of fog tasks and preserving the distance between the user and available resources. Although some research has been conducted on fog task migration, none of them have considered load balancing in... 

Nowadays, adaptable, versatile and flexible nature of Flying ad-hoc Networks (FANETs) make them popular in many academic and practical fields such as real-time applications, civil applications, search and rescue operations, identification and logistics. FANETs are organized multi-UAV systems that can accomplish complex missions through cooperation and collaboration. The unique features of these networks, such as high mobility, low node density, high frequency of topology changes, and three-dimensional flight environment, create various challenges in communication, especially in packet routing. In this type of network, a subset of UAVs connects to the infrastructure, while the remaining UAVs...