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Search Results: 1 - 10 of 9560 matches for " Sandra Nutter "
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Evaluation of Indirect Fluorescent Antibody Assays Compared to Rapid Influenza Diagnostic Tests for the Detection of Pandemic Influenza A (H1N1) pdm09
Sandra Nutter,Michele Cheung,Felice C. Adler-Shohet,Kathryn Krusel,Kate Vogel,Hildy Meyers
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0033097
Abstract: Performance of indirect fluorescent antibody (IFA) assays and rapid influenza diagnostic tests (RIDT) during the 2009 H1N1 pandemic was evaluated, along with the relative effects of age and illness severity on test accuracy. Clinicians and laboratories submitted specimens on patients with respiratory illness to public health from April to mid October 2009 for polymerase chain reaction (PCR) testing as part of pandemic H1N1 surveillance efforts in Orange County, CA; IFA and RIDT were performed in clinical settings. Sensitivity and specificity for detection of the 2009 pandemic H1N1 strain, now officially named influenza A(H1N1)pdm09, were calculated for 638 specimens. Overall, approximately 30% of IFA tests and RIDTs tested by PCR were falsely negative (sensitivity 71% and 69%, respectively). Sensitivity of RIDT ranged from 45% to 84% depending on severity and age of patients. In hospitalized children, sensitivity of IFA (75%) was similar to RIDT (84%). Specificity of tests performed on hospitalized children was 94% for IFA and 80% for RIDT. Overall sensitivity of RIDT in this study was comparable to previously published studies on pandemic H1N1 influenza and sensitivity of IFA was similar to what has been reported in children for seasonal influenza. Both diagnostic tests produced a high number of false negatives and should not be used to rule out influenza infection.
Cyber-Innovation in the STEM Classroom, a Mixed Reality Approach  [PDF]
Tahar Messadi, Winifred E. Newman, Andrew Braham, Darin Nutter
Creative Education (CE) , 2018, DOI: 10.4236/ce.2018.915179
Abstract: In this article,?we present a formative evaluation of an ongoing NSF-sponsored?research project in classroom innovation using augmented reality (AR) to enhance STEM education. Exposing students to advances in digital modeling, data visualization and performative software prepares them for new pathways for decision-making in the AEC professions. Recent research shows that Technology Mediated Learning Environments (interacting with computer-based tools) can enhance learning. Augmented Reality (AR) or the ability to augment the real-world environment with computer-generated information is bringing a new dimension to learning and designing using multiple data streams.
CO2e emissions from HVAC equipment and lifetime operation for common U.S. building types
Aik Jong Tan, Darin W. Nutter
International Journal of Energy and Environment , 2011,
Abstract: Greenhouse gas emissions associated with the lifetime operational energy use and equipment manufacture of the heating, ventilating, and air-conditioning equipment for ten common commercial building types were presented. The influence of operating the building in several different climate regions were included in the analysis. Emission factors for natural gas and each of the three North American Electric Reliability Corporation major interconnections were used. Results found emissions associated with a building’s lifetime operational energy use were dominant compared to those from the equipment manufacture and production which ranged from 1.9 – 4.2%. Primary factors that influenced the emission rates were found to be regional electrical emission factors, building type, and climate.
Weight Bias: Twitter as a Tool for Opening Dialogue among Broad Audiences  [PDF]
Emily P. Williams, Shelly Russell-Mayhew, Sarah Nutter, Nancy Arthur, Anusha Kassan
Social Networking (SN) , 2018, DOI: 10.4236/sn.2018.73009
Twitter is a tool for strengthening research knowledge mobilization to the general public. In this article, we highlight how Twitter can be used to open social dialogue about research related topics between users from multiple perspectives, using the topic of weight bias; a cultural issue largely perpetuated by the media. Specifically, Twitter (@UCalgary Body BS) was used by an interdisciplinary research team to under line cases of global news, stories, and policy related to weight bias and/or weight-related issues for a broad audience to consume. We position Twitter as a relevant means for 1) shaping the research lifecycle, 2) increasing community participation and engagement regarding specific research topics, 3) co-creating evolving social dialogues and critique, 4) reaching broader audiences, 5) opening up sites of debate and tension within a topic, and 6) engaging with a topic salient within our society, a topic that saturates the media—weight bias.
Humanoid Upper Torso Complexity for Displaying Gestures
Robert Richardson,David Devereux,Jennifer Burt,Paul Nutter
International Journal of Advanced Robotic Systems , 2008,
Abstract: Body language is an important part of human-to-human communication; therefore body language in humanoid robots is very important for successful communication and social interaction with humans. The number of degrees of freedom (d.o.f) necessary to achieve realistic body language in robots has been investigated. Using animation, three robots were simulated performing body language gestures; the complex model was given 25 d.o.f, the simplified model 18 d.o.f and the basic model 10 d.o.f. A subjective survey was created online using these animations, to obtain people's opinions on the realism of the gestures and to see if they could recognise the emotions portrayed. It was concluded that the basic system was the least realistic, complex system the most realistic, and the simplified system was only slightly less realistic than the human. Modular robotic joints were then fabricated so that the gestures could be implemented experimentally. The experimental results demonstrate that through simplification of the required degrees of freedom, the gestures can be experimentally reproduced.
Backward Coding of Wavelet Trees with Fine-grained Bitrate Control
Jiangling Guo,Sunanda Mitra,Brain Nutter,Tanja Karp
Journal of Computers , 2006, DOI: 10.4304/jcp.1.4.1-7
Abstract: Backward Coding of Wavelet Trees (BCWT) is an extremely fast wavelet-tree-based image coding algorithm. Utilizing a unique backward coding algorithm, BCWT also provides a rich set of features such as resolution- scalability, extremely low memory usage, and extremely low complexity. However, BCWT in its original form inherits one drawback also existing in most non-bitplane codecs, namely coarse bitrate control. In this paper, two solutions for improving the bitrate controllability of BCWT are presented. The first solution is based on dual minimum quantization levels, allowing BCWT to achieve fine-grained bitrates with quality-index as a controlling parameter; the second solution is based on both dual minimum quantization levels and a coding histogram, providing the ability to use target bitrate as the controlling parameter with only a small speed penalty.
Multilevel Wavelet Feature Statistics for Efficient Retrieval, Transmission, and Display of Medical Images by Hybrid Encoding
Yang Shuyu,Mitra Sunanda,Corona Enrique,Nutter Brian
EURASIP Journal on Advances in Signal Processing , 2003,
Abstract: Many common modalities of medical images acquire high-resolution and multispectral images, which are subsequently processed, visualized, and transmitted by subsampling. These subsampled images compromise resolution for processing ability, thus risking loss of significant diagnostic information. A hybrid multiresolution vector quantizer (HMVQ) has been developed exploiting the statistical characteristics of the features in a multiresolution wavelet-transformed domain. The global codebook generated by HMVQ, using a combination of multiresolution vector quantization and residual scalar encoding, retains edge information better and avoids significant blurring observed in reconstructed medical images by other well-known encoding schemes at low bit rates. Two specific image modalities, namely, X-ray radiographic and magnetic resonance imaging (MRI), have been considered as examples. The ability of HMVQ in reconstructing high-fidelity images at low bit rates makes it particularly desirable for medical image encoding and fast transmission of 3D medical images generated from multiview stereo pairs for visual communications.
A Prototype Embedded Microprocessor Interconnect for Distributed and Parallel Computing
Bryan Hughes,Brian Nutter,Per Andersen,Daniel Cooke
Journal of Systemics, Cybernetics and Informatics , 2008,
Abstract: Parallel computing is currently undergoing a transition from a niche use to widespread acceptance due to new, computationally intensive applications and multi-core processors. While parallel processing is an invaluable tool for increasing performance, more time and expertise are required to develop a parallel system than are required for sequential systems. This paper discusses a toolkit currently in development that will simplify both the hardware and software development of embedded distributed and parallel systems. The hardware interconnection mechanism uses the Serial Peripheral Interface as a physical medium and provides routing and management services for the system. The topics in this paper are primarily limited to the interconnection aspect of the toolkit.
Biologically Inspired Perimeter Detection for Whole-Arm Grasping
David Devereux,Robert Richardson,Arjun Nagendran,Paul Nutter
ISRN Robotics , 2013, DOI: 10.5402/2013/783083
Abstract: Grasping is a useful ability that allows manipulators to constrain objects to a desired location or trajectory. Whole-arm grasping is a specific method of grasping an object that uses the entire surface of the manipulator to apply contact forces. Elephant trunks and snakes and octopus arms are illustrative of these methods. One of the greatest challenges of whole-arm grasping in poorly defined environments is accurately identifying the perimeter of an object. Existing algorithms for this task use restrictive assumptions or place unrealistic demands on the required hardware. Here, a new algorithm (termed Octograsp) has been developed as a method of gaining information on the shape of the grasped object through tactile information alone. The contact information is processed using an inverse convex hull algorithm to build a model of the object’s shape and position. The performance of the algorithm is examined using both simulated and experimental hardware. Methods of increasing the level of contact information through repeated contact attempts are presented. It is demonstrated that experimentally obtained, coarsely spaced, contact information can result in an accurate model of an object’s shape and position. 1. Introduction To grasp an object is to seize or hold it, thereby constraining it to a desired position or trajectory. Industrial robots implement finger-tip grasping (based around biological inspiration from humans) to perform tasks on objects that are normally well defined, often rigid, and always considerably smaller than the robotic manipulator. Robotic systems are increasingly being considered for new application areas where the operating requirements are more complex and less well defined; consider the use of robotic end-effectors for the assembly of complex machines with components of varying size and consistency. For applications such as these, an alternative approach to robotic grasping is required. Whole-arm grasping is an alternative to finger-tip grasping [1, 2] that is used by animals such as elephants, snakes and octopuses. Whole-arm grasping uses the entire surface of the manipulator to provide contacts between the object and manipulator. This allows the distribution of grasp forces and an increased surface area to aid the grasping of smooth objects. For example, consider the scenario of Figure 1 where a 10-link multiple section robot arm has encircled an object and is applying grasping forces. Each link has the capability of exerting forces at various points along the objects body. The grasping control aim is to exert the minimum
The initial conditions of isolated star formation -- IX. Akari mapping of an externally heated pre-stellar core
D. Nutter,D. Stamatellos,D. Ward-Thompson
Physics , 2009, DOI: 10.1111/j.1365-2966.2009.14837.x
Abstract: We present observations of L1155 and L1148 in the Cepheus molecular cloud, taken using the FIS instrument on the Akari satellite. We compare these data to submillimetre data taken using the SCUBA camera on the JCMT, and far-infrared data taken with the ISOPHOT camera on board the ISO satellite. All of the data show a relation between the position of the peak of emission and the wavelength for the core of L1155. We interpret this as a temperature gradient. We fit modified blackbody curves to the spectral energy distributions at two positions in the core and see that the central core in L1155 (L1155C) is approximately 2 degrees warmer at one edge than it is in the centre. We consider a number of possible heating sources and conclude that the A6V star BD+67 1263 is the most likely candidate. This star is at a distance of 0.7 pc from the front of L1155C in the plane of the sky. We carry out radiative transfer modelling of the L1155C core including the effects from the nearby star. We find that we can generate a good fit to the observed data at all wavelengths, and demonstrate that the different morphologies of the core at different wavelengths can be explained by the observed 2 degree temperature gradient. The L1148 core exhibits a similar morphology to that of L1155C, and the data are also consistent with a temperature gradient across the core. In this case, the most likely heating source is the star BD197053. Our findings illustrate very clearly that the apparent observed morphology of a pre-stellar core can be highly dependent on the wavelength of the observation, and that temperature gradients must be taken into account before converting images into column density distributions. This is important to note when interpreting Akari and Spitzer data and will also be significant for Herschel data.
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