Toronto, Canada
Toronto, Canada

Ryerson University is a public research university located in downtown Toronto, Ontario, Canada. Its urban campus surrounds the Yonge-Dundas Square; located at the busiest intersection in Downtown Toronto. It is seen as one of Canada's leading universities and has a focus on applied, career-oriented education. The majority of its buildings are in the blocks northeast of the Yonge-Dundas Square in Toronto's Garden District. Wikipedia.


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Patent
Ryerson University | Date: 2016-11-01

Systems and methods for surgical guidance and image registration are provided, in which three-dimensional image data associated with an object or patient is registered to topological image data obtained using a surface topology imaging device. The surface topology imaging device may be rigidly attached to an optical position measurement system that also tracks fiducial markers on a movable instrument. The instrument may be registered to the topological image data, such that the topological image data and the movable instrument are registered to the three-dimensional image data. The three-dimensional image data may be CT or MRI data associated with a patient. The system may also co-register images pertaining to a surgical plan with the three-dimensional image data. In another aspect, the surface topology imaging device may be configured to directly track fiducial markers on a movable instrument. The fiducial markers may be tracked according to surface texture.


Rousseau D.,Ryerson University
Current Opinion in Colloid and Interface Science | Year: 2013

The pace of development of edible Pickering emulsions has recently soared, as interest in their potential for texture modification, calorie reduction and bioactive compound encapsulation and delivery has risen. In the broadest sense, Pickering emulsions are defined as those stabilized by interfacially-adsorbed solid particles that retard and ideally prevent emulsion coalescence and phase separation. Numerous fat-based species have been explored for their propensity to stabilize edible emulsions, including triglyceride and surfactant-based crystals and solid lipid nanoparticles. This review explores three classes of fat-based Pickering stabilizers, and proposes a microstructure-based nomenclature to delineate them: Type I (surfactant-mediated interfacial crystallization), Type II (interfacially-adsorbed nano- or microparticles) and Type III (shear-crystallized droplet encapsulation matrices). Far from simply reporting the latest findings on these modes of stabilization, challenges associated with these are also highlighted. Finally, though emphasis is placed on food emulsions, the fundamental precepts herein described are equally applicable to non-food multicomponent emulsion systems. © 2013 Elsevier Ltd.


Enteric pathogens must not only survive passage through the gastrointestinal tract but must also coordinate expression of virulence determinants in response to localized microenvironments with the host. Enterohemorrhagic Escherichia coli (EHEC), a serious food and waterborne human pathogen, is well equipped with an arsenal of molecular factors that allows it to survive passage through the gastrointestinal tract and successfully colonize the large intestine. This review will explore how EHEC responds to various environmental cues associated with particular microenvironments within the host and how it employs these cues to modulate virulence factor expression, with a view to developing a conceptual framework for understanding modulation of EHEC's virulence program in response to the host. In vitro studies ofer signifcant insights into the role of individual environmental cues but in vivo studies using animal models as well as data from natural infections will ultimately provide a more comprehensive picture of the highly regulated virulence program of this pathogen. © 2013 Landes Bioscience.


Misic J.,Ryerson University
IEEE Journal on Selected Areas in Communications | Year: 2012

We investigate the performance of simple cognitive personal area network (CPAN) with cooperative sensing among the nodes and CPAN coordinator. Nodes are equipped with small buffers of capacity K packets, and each node is allowed to transmit a batch of up to μ packets in one transmission cycle. Upon transmission, each node must support the operation of the CPAN by performing sensing duty. We model this system through probabilistic analysis and a queuing model, and demonstrate the tradeoff between the accuracy of cooperative spectrum sensing and node's ability to communicate. © 2012 IEEE.


Chow J.Y.J.,Ryerson University
Computer-Aided Civil and Infrastructure Engineering | Year: 2014

Activity-based travel scenario analysis and network design using a household activity pattern problem (HAPP) can face significant computational cost and inefficiency. One solution approach, called reoptimization, makes use of an optimal solution of a prior problem instance to find a new solution faster and more accurately. Although the method is generally NP-hard as well, the approximation bound has been shown in the literature to be tighter than a full optimization for several traveling salesman problem variations. To date, however, there have not been any computational studies conducted with the method for scenario analysis with generalized vehicle routing problems, nor has there been any metaheuristics designed with reoptimization in mind. A generalized, selective household activity routing problem (G-SHARP) is presented as an extension of the HAPP model to include both destination and schedule choice for the purpose of testing reoptimization. Two reoptimization algorithms are proposed: a simple swap heuristic and a new class of evolutionary algorithms designed for reoptimization, dubbed a Genetic Algorithm with Mitochondrial Eve (GAME). The two algorithms are tested against a standard genetic algorithm in a computational experiment involving 100 zones that include 400 potential activities (resulting in a total of 802 nodes per single-traveler household). Five hundred households are synthesized and computationally tested with a base scenario, a scenario where an office land use in one zone is dezoned, and a scenario where a freeway is added onto the physical network. The results demonstrate the effectiveness of reoptimization heuristics, particularly GAME, and the capability of G-SHARP to capture reallocations of activities and schedules with respect to spatiotemporal changes. © 2013 Computer-Aided Civil and Infrastructure Engineering.


Fiala M.,Ryerson University
IEEE Transactions on Pattern Analysis and Machine Intelligence | Year: 2010

Fiducial markers are artificial landmarks added to a scene to facilitate locating point correspondences between images, or between images and a known model. Reliable fiducials solve the interest point detection and matching problems when adding markers is convenient. The proper design of fiducials and the associated computer vision algorithms to detect them can enable accurate pose detection for applications ranging from augmented reality, input devices for HCI, to robot navigation. Marker systems typically have two stages, hypothesis generation from unique image features and verification/ identification. A set of criteria for high robustness and practical use are identified and then optimized to produce the ARTag fiducial marker system. An edge-based method robust to lighting and partial occlusion is used for the hypothesis stage, and a reliable digital coding system is used for the identification and verification stage. Using these design criteria large gains in performance are achieved by ARTag over conventional ad hoc designs. © 2010 IEEE.


A composition comprising an inner core of UHMWPE fibres having a molecular weight greater than 500,000 Daltons with a denier of from about 700 to about 3000, preferably from about 1000 to about 2500, more preferably from about 1500 to about 2000, most preferably from about 1500 to about 1800, with an overall thickness of 0.2 to 0.8 mm and a nylon coating.


Provided herein is a method to detect, characterize and classify a particle comprising: controlling a light source and an ultrasound transducer to irradiate the particle with light and an ultrasound pulse; determining a feature associated with the particle by processing ultrasound data resulting from the particle being irradiated; and comparing the feature to a reference to determine at least one property of the particle. According to some non-limiting implementations, the feature comprises a power spectrum of the particle. According to some non-limiting implementations, the ultrasound data is processed to determine characteristics in a range of about 100 MHz to about 1000 MHz of the power spectrum. According to some non-limiting implementations, the ultrasound pulse is in a range of about 100 MHz to about 1000 MHz. A computing device to detect, characterize and classify a particle is also provided.


Patent
Ryerson University | Date: 2015-08-03

Systems and methods for surgical guidance and image registration are provided, in which three-dimensional image data associated with an object or patient is registered to topological image data obtained using a surface topology imaging device. The surface topology imaging device may be rigidly attached to an optical position measurement system that also tracks fiducial markers on a movable instrument. The instrument may be registered to the topological image data, such that the topological image data and the movable instrument are registered to the three-dimensional image data. The three-dimensional image data may be CT or MRI data associated with a patient. The system may also co-register images pertaining to a surgical plan with the three-dimensional image data. In another aspect, the surface topology imaging device may be configured to directly track fiducial markers on a movable instrument. The fiducial markers may be tracked according to surface texture.


Patent
Ryerson University | Date: 2013-04-15

A fastener carrier for fasteners for use in a riveting system, said carrier comprising at least one holding zone and at least one release zone, wherein said holding zone holds a fastener in a stored position and said release zone releases said fastener from said carrier, said holding zone having a diameter smaller than said release zone.

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