Browsing by Author "Mohamed, Tamer"

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    Fault-tolerant Architectures for Nanowire and Quantum Array Devices
    (2013-04-30) Mohamed, Tamer; Yanushkevich, Svetlana
    This work investigates techniques for building fault-tolerant digital circuits at the nano-scale. It provides an overview of some nano-scale technology candidates that can be used in the next generation of digital circuit based on nanoelectronic logic fabrics. It focuses on fault tolerance of such circuits at both the circuit and the architecture level. A case study based on pass-transistor logic using wrap-gate nanowire devices is presented. Such circuits implement logic computing in the form of binary decision diagrams (BDDs), however, they are not fault-immune. In this thesis, the BDD based nanowire devices that incorporate error correction coding are proposed. In addition, a planarization algorithm is presented and implemented in order to synthesize planar error correcting circuits using such devices. Alternative architecture, such as the cross-bar nano-FPGA, is considered as another candidate for fault-tolerance. Simulation and modeling of all the presented architectures are performed using the developed software "BDD processing tool", CUDD package and SPICE.
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    Hybrid Simulation Environment for Construction Projects: Identification of System Design Criteria
    (2014-06-29) Moussa, Mohamed; Ruwanpura, Janaka Y.; Jergeas, George; Mohamed, Tamer
    Large construction projects are complex, dynamic, and unpredictable. They are subject to external and uncontrollable events that affect their schedule and financial outcomes. Project managers take decisions along the lifecycle of the projects to align with projects objectives. These decisions are data dependent where data change over time. Simulation-based modeling and experimentation of such dynamic environment are a challenge. Modeling of large projects or multiprojects is difficult and impractical for standalone computers. This paper presents the criteria required in a simulation environment suitable for modeling large and complex systems such as construction projects to support their lifecycle management. Also presented is a platform that encompasses the identified criteria. The objective of the platform is to facilitate and simplify the simulation and modeling process and enable the inclusion of complexity in simulation models.