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Computer Meteorology: Monitoring Compute Clouds

Cloud computing environments allow customers to execute arbitrary code on hardware owned by a cloud provider. While cloud providers use virtualization to ensure isolation between customers, they face additional security challenges. Malicious customers may leverage the provider's hardware to launch attacks, either from VMs they own or by compromising VMs...

Tags: Monitoring, Customer, University Of Toronto, Computer, Monitors & Displays, Security, Hardware, Components

White papers 2009-05-16

Denial of Service Attacks in Networks With Tiny Buffers

Recently, several papers have studied the possibility of shrinking buffer sizes in Internet core routers to just a few dozen packets under certain constraints. If proven right, these results can open doors to building all-optical routers, since a major bottleneck in building such routers is the lack of large optical...

Tags: Denial Of Service, Router, Network, Buffer, University Of Toronto, Routers & Switches, Network Technology, Networking, Security

White papers 2009-04-08

Adding the Easy Button to the Cloud With SnowFlock and MPI

Cloud computing promises to provide researchers with the ability to perform parallel computations using large pools of Virtual Machines VMs, without facing the burden of owning or maintaining physical infrastructure. However, with ease of access to hundreds of VMs, comes also an increased management burden. Cloud users today must manually...

Tags: Virtual Machine, University Of Toronto, Desktop Virtualization, Virtualization, Hardware

White papers 2009-02-20

Stochastic Analysis of Network Coding in Epidemic Routing

Epidemic routing has been proposed to reduce the data transmission delay in disruption tolerant wireless networks, in which data can be replicated along multiple opportunistic paths as different nodes move within each other's communication range. With the advent of network coding, it is intuitive that data can not only be...

Tags: Network, Analysis, University Of Toronto, Epidemic, Networking

White papers 2008-04-02

Adaptive Random Network Coding in WiMAX

The IEEE 802.16 standard, or WiMAX, has emerged as one of the strongest contenders for broadband wireless access technology. This paper proposes adaptive random network coding in WiMAX by introducing two algorithms in order to further improve the performance. First, the authors utilize the channel state information feedback to dynamically...

Tags: Network, Broadband Wireless, University Of Toronto, WiMAX, Broadband Internet, Wireless And Mobility, Telecommunications, Wi-Fi

White papers 2008-02-29

Is Random Network Coding Helpful in WiMAX?

The IEEE 802.16 standard, or WiMAX, has emerged to facilitate high-bandwidth wireless access in realworld metropolitan areas, commonly referred to as 4G. In WiMAX, Hybrid Automatic Repeat reQuest HARQ is adopted to transmit data packets reliably. However, it sacrifices resilience in time varying channels, and it may under-utilize the wireless...

Tags: Network, University Of Toronto, Wireless, WiMAX, Wi-Fi, Wireless And Mobility

White papers 2008-01-15

VDCBPI: An Approximate Scalable Algorithm for Large POMDPs

Existing algorithms for discrete partially observable Markov decision processes can at best solve problems of a few thousand states due to two important sources of intractability: the curse of dimensionality and the policy space complexity. This paper describes a new algorithm VDCBPI that mitigates both sources of intractability by combining...

Tags: Algorithm, University Of Toronto, Network Management, Engineering, Network Administration, Networking

White papers 2008-01-01

Efficient Incremental Validation of XML Documents

This paper discusses incremental validation of XML documents with respect to DTDs and XML Schema definitions. The paper considers insertions and deletions of subtrees, as opposed to leaf nodes only, and the paper also considers the validation of ID and IDREF attributes. The paper presents two classes of schemas, which...

Tags: Paper, XML Document, DTD, University Of Toronto, XML, Software/Web Development, Web Development

White papers 2008-01-01

HeliCal 1 (Windows)

HeliCal is a desktop clock that shows your next Google Calendar events. It allows you to manage your time and anticipate your upcoming events much more flexibly than using reminders. HeliCal is particularly useful if you have a busy schedule. Version 1 includes unspecified updates.

Tags: University Of Toronto, HeliCal, Digital Security, Microsoft Windows, Network Security, Security, Operating Systems, Software, Networking

Software downloads 2007-04-26

Balancing Interruption Frequency and Buffering Penalties in VBR Video Streaming

The main goal of a streaming application is to enable the successful decoding of each video object before its displaying deadline is violated, and to recover from a deadline violation properly. Hence, the paper defines the main performance metric of a streaming system as the number of interruptions during a...

Tags: Jitter, Video, University Of Toronto, Corporate Communications, Marketing

White papers 2007-01-31

A Min-Plus System Interpretation of Bandwidth Estimation

Significant research has been dedicated to methods that estimate the available bandwidth in a network from traffic measurements. While estimation methods abound, less progress has been made on achieving a foundational understanding of the bandwidth estimation problem. This paper develops a min-plus system theoretic formulation of bandwidth estimation. The paper...

Tags: Network, University Of Toronto, Networking

White papers 2007-01-17

Linear Precoding for Multiuser MIMO-OFDM Systems

This paper develops linear precoding schemes for the downlink in multiuser Multiple-Input Multiple-Output MIMO Orthogonal Frequency Division Multiplexing OFDM systems with multiple data streams per user. The authors extend an existing multiuser MIMO algorithm, that jointly optimizes the power allocation and the transmit and receive filters, to MIMOOFDM systems. One...

Tags: MIMO, Allocation, MIMO-OFDM, University Of Toronto, OFDM, Wireless

White papers 2006-09-28

Painting a semiconductor

Making electronic chips and other devices is a dirty and expensive process. Building them from chemical solutions have been tried for a while because of the low costs. But the resulting chips were not really good performers. Now, researchers at the University of Toronto have created a semiconductor which is...

Tags: semiconductor

Blog posts 2006-07-18

Heisenberg Security at your service

Researchers at the University of Toronto have developed a new technique using photons to keep your data safe when transmitted over a fiber-optic cable. They based their research on Heisenberg's Uncertainty Principle and used photonic 'decoys' to encrypt data over distances of 15 kilometers. By mixing these photon keys with...

Tags: technique, Hoi-Kwong Lo, quantum key distribution

Blog posts 2006-02-26

An Introduction to Multicarrier Modulation

Multicarrier modulation helps to reduce the detrimental effects of multipath fading. Because of its robustness to multipath, and the ease of implementing it in transmitters and receivers using the Fast Fourier Transform FFT, the MCM concept is growing rapidly in practical importance. It can be found today in IEEE standards...

Tags: Modulation, Multipath, University Of Toronto, WiMAX, Wireless LANs, Wireless

White papers 2005-05-31

Adaptive Channel SVD Estimation for MIMO-OFDM Systems

In this paper an adaptive estimation algorithm for channel matrix singular value decomposition SVD in multiple-input multiple-output MIMO orthogonal frequency division multiplexing OFDM systems is proposed. The SVD method is an efficient approach to design space-time coding/decoding and detection algorithms in MIMO-OFDM systems. However, the SVD estimation may involve complex...

Tags: Algorithm, MIMO-OFDM, University Of Toronto, Singular Value Decomposition Method, OFDM, Engineering, Wireless

White papers 2005-05-07

Service Level Management: Optimizing Your OSS for SLA Delivery

As the Telecommunication world move from the circuit switching to packet switching and from the dedicated circuit to IP VPN, QoS, Service Level Management is becoming more and more vital when the service provider deals with customers. This paper presents the architecture and design of an integrated and automated Service...

Tags: SLA, University Of Toronto, OSS, Service Level Management, Service Management, It Operations, It service Management

White papers 2004-10-19

Differential Modulation Diversity for OFDM

The application of Differential Modulation Diversity DMD to orthogonal frequency division multiplexing with multiple transmit and/or receive antennas is considered. Based on diagonal signals originally designed for differential space-time modulation, DMD is used to exploit both space and frequency diversity. At the receiver, low-complexity decision-feedback differential detection without channel state...

Tags: University Of Toronto, OFDM, Wireless

White papers

Additional Resources

IBM Cognos Is the Glue That Brings Management and Clinical Departments Together at the Bloorview Kids Rehab Center

Bloorview Kids Rehab, known as Bloorview, is Canada's largest children's rehabilitation hospital. In 2002, Bloorview partnered with the University of Toronto to become Canada's first teaching hospital in children's rehabilitation. It needed to integrate clinical and business data and make it easy to access and use for wise business decisions....

Tags: Cognos Inc., Hospital, Brings Co., Decision-making, Canada, IBM Corp., Tools & Techniques, Healthcare, Management

Case studies 2009-07-01

Light sensor discovery could revolutionize digital cameras

One of the biggest hindrances to beautiful pictures on a digital camera is lighting. Even if you set the  shutter speed, focus and whatever other mode manually, unless you have a tripod handy, chances are your photo could come out blurry or shaky if you're in a place with low...

Tags: Digital Camera, Camera, Semiconductor, Digital Cameras, Digital Photography, Consumer Electronics, Personal Technology, Rachel King

Blog posts 2009-06-19