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You searched for +publisher:"University of Toronto" +contributor:("Alberto, Leon-Garcia"). Showing records 1 – 2 of 2 total matches.

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University of Toronto

1. Leila, Shayanpour. QoE-based Application Mapping for Resource Management.

Degree: 2010, University of Toronto

Mapping between many different applications and many different underlying technologies is very complicated. Moreover, since users need service continuity and want to get the service in a satisfactory level, firstly, their perception of the service should be measured and secondly, the changes in the underlying technologies should be transparent to users. As a result, there should be ”virtualization layer” between application layer and underlying access technologies whose job is to abstract user perception of the application in terms of network parameters and transfer these requirements to underlying layers. In this thesis, we propose a generic mathematical expression to abstract user perception of application in a unified way for different applications. Since today applications are composite applications, having a generalized expression that has the same form for various applications can ease resource management calculations. We use application service map which is based on quality of experience for resource management.

MAST

Advisors/Committee Members: Alberto, Leon-Garcia, Electrical and Computer Engineering.

Subjects/Keywords: Mean Opinion Score; General Expression; QoS Class Mapping; Quality Assessment; Multimedia; Application Virtualization; 0544

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APA (6th Edition):

Leila, S. (2010). QoE-based Application Mapping for Resource Management. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/25798

Chicago Manual of Style (16th Edition):

Leila, Shayanpour. “QoE-based Application Mapping for Resource Management.” 2010. Masters Thesis, University of Toronto. Accessed October 31, 2020. http://hdl.handle.net/1807/25798.

MLA Handbook (7th Edition):

Leila, Shayanpour. “QoE-based Application Mapping for Resource Management.” 2010. Web. 31 Oct 2020.

Vancouver:

Leila S. QoE-based Application Mapping for Resource Management. [Internet] [Masters thesis]. University of Toronto; 2010. [cited 2020 Oct 31]. Available from: http://hdl.handle.net/1807/25798.

Council of Science Editors:

Leila S. QoE-based Application Mapping for Resource Management. [Masters Thesis]. University of Toronto; 2010. Available from: http://hdl.handle.net/1807/25798


University of Toronto

2. Rastegarfar, Houman. Optical Switching in Next-generation Data Centers.

Degree: PhD, 2014, University of Toronto

This thesis presents advanced optical connectivity solutions for next-generation data centers, spanning millions of processing cores. The wavelength routing of optical packets based on arrayed waveguide gratings (AWGs), tunable wavelength converters (TWCs), and fiber delay lines (FDLs) is a disruptive technology for capacity, footprint, and flexibility requirements of massive cloud data centers. We develop a wavelength-division multiplexed (WDM) design based on Birkhoff-von Neumann architecture as a bit-rate transparent, scalable solution to switching bottlenecks in data center networks. As no mature all-optical buffering technology is currently available, central to our design is the buffering strategy that we adopt to store contending packets. Due to the limited number of FDLs, packet drops are common in optical packet switching (OPS) data centers and limit the network throughput. In a practical scenario, physical layer impairments, predominantly amplified spontaneous emission (ASE) noise and crosstalk, degrade Q-factor and lead to additional packet drops. To examine the performance of optical buffer units more accurately, we develop a unified analysis framework, integrating the network layer and the physical layer effects. Using this framework, we refine our architectures and provide guidelines for minimizing the physical layer impact. Besides, optical switch designs should not neglect the diversity of data center traffic patterns when developing connectivity solutions. Empirical studies of data center network traffic reveal that server traffic exhibits strong spatial and temporal correlations. We examine the effectiveness of an AWG-based load balancer with round-robin tuning TWCs in resolving congestion penalties in the data center network. Our cross-layer analysis suggests that the physical layer impairments due to the load balancer hardware could counteract its potential gains and lead to significant throughput degradation. To resolve this challenge, we develop a novel modular router architecture based on WDM shared recirculation buffers that integrates the functions of load balancing and routing and maximizes the optical buffering gains. The router employs a load-balancing scheduler to maximize throughput and minimize delay. Our mathematical analysis and Monte Carlo simulations show that the consolidation of optical buffer slots into WDM FDLs accompanied with internal load balancing leads to a virtually lossless router, resilient to data center traffic anomalies. Advisors/Committee Members: Alberto, Leon-Garcia, Electrical and Computer Engineering.

Subjects/Keywords: cloud computing; data center; optical packet switching; wavelength-division multiplexing; wavelength routing; 0544

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Rastegarfar, H. (2014). Optical Switching in Next-generation Data Centers. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/68212

Chicago Manual of Style (16th Edition):

Rastegarfar, Houman. “Optical Switching in Next-generation Data Centers.” 2014. Doctoral Dissertation, University of Toronto. Accessed October 31, 2020. http://hdl.handle.net/1807/68212.

MLA Handbook (7th Edition):

Rastegarfar, Houman. “Optical Switching in Next-generation Data Centers.” 2014. Web. 31 Oct 2020.

Vancouver:

Rastegarfar H. Optical Switching in Next-generation Data Centers. [Internet] [Doctoral dissertation]. University of Toronto; 2014. [cited 2020 Oct 31]. Available from: http://hdl.handle.net/1807/68212.

Council of Science Editors:

Rastegarfar H. Optical Switching in Next-generation Data Centers. [Doctoral Dissertation]. University of Toronto; 2014. Available from: http://hdl.handle.net/1807/68212

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