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topology-optimisation
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Optimal feeder design in sand casting process by growth method
, Article International Journal of Cast Metals Research ; Volume 20, Issue 5 , 2007 , Pages 288-296 ; 13640461 (ISSN) ; Davami, P ; Sharif University of Technology
2007
Abstract
The computer aided optimal feeder design in the sand casting process is considered. The design problem is formulated as an additive evolutionary topology optimisation problem. The initial design of the presented method is a casting part which is placed in a suitable environmental mould box. The method is composed of three stages: determination of the feeder neck connection point, construction of the feeder neck and the feeder growth. During the growth stage, the feeder topology is improved gradually until satisfying some predefined criteria. The technological constraints and user contribution can be easily incorporated in the presented method. The success of the proposed method is supported...
Mobility-Aware content caching using graph-coloring
, Article IEEE Transactions on Vehicular Technology ; Volume 71, Issue 5 , 2022 , Pages 5666-5670 ; 00189545 (ISSN) ; Zeinalpour Yazdi, Z ; Ashtiani, F ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2022
Abstract
Caching the popular files in the memories of small base stations (SBSs) is an effective solution to the limited capacity of wireless backhaul links. The efficiency of caching depends on the proper design of the content placement. This is more challenging when the SBSs have overlapped coverage and especially when the users are also mobile. In this letter, we exploit the concept of graph-coloring and model the connection between SBSs and users as well as user mobilities, through a weighted graph in which SBSs are its vertices, and propose some algorithms to color it effectively. Then, we fill the memory of colored SBSs with popular content accordingly. © 1967-2012 IEEE
Prediction of shape and internal structure of the proximal femur using a modified level set method for structural topology optimisation
, Article Computer Methods in Biomechanics and Biomedical Engineering ; Volume 15, Issue 8 , 2012 , Pages 835-844 ; 10255842 (ISSN) ; Farahmand, F ; Rouhi, G ; Movahhedy, M. R ; Sharif University of Technology
Abstract
A computational framework was developed to simulate the bone remodelling process as a structural topology optimisation problem. The mathematical formulation of the Level Set technique was extended and then implemented into a coronal plane model of the proximal femur to simulate the remodelling of internal structure and external geometry of bone into the optimal state. Results indicated that the proposed approach could reasonably mimic the major geometrical and material features of the natural bone. Simulation of the internal bone remodelling on the typical gross shape of the proximal femur, resulted in a density distribution pattern with good consistency with that of the natural bone. When...