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https://www.readbyqxmd.com/read/28230753/formal-uncertainty-and-dispersion-of-single-and-double-difference-models-for-gnss-based-attitude-determination
#1
Wen Chen, Chao Yu, Danan Dong, Miaomiao Cai, Feng Zhou, Zhiren Wang, Lei Zhang, Zhengqi Zheng
With multi-antenna synchronized global navigation satellite system (GNSS) receivers, the single difference (SD) between two antennas is able to eliminate both satellite and receiver clock error, thus it becomes necessary to reconsider the equivalency problem between the SD and double difference (DD) models. In this paper, we quantitatively compared the formal uncertainties and dispersions between multiple SD models and the DD model, and also carried out static and kinematic short baseline experiments. The theoretical and experimental results show that under a non-common clock scheme the SD and DD model are equivalent...
February 20, 2017: Sensors
https://www.readbyqxmd.com/read/28230623/safety-and-accuracy-of-freehand-versus-navigated-iliac-screws-results-from-222-screw-placements
#2
Randall J Hlubek, Kaith K Almefty, David S Xu, Jay D Turner, U Kumar Kakarla
STUDY DESIGN: Retrospective review. OBJECTIVE: To compare the safety and accuracy of the freehand technique versus stereotactic navigation for placement of iliac screws. SUMMARY OF BACKGROUND DATA: Iliac screw fixation is often used to augment lumbosacral reconstruction in advanced spine disease to increase the likelihood of successful arthrodesis. Iliac screws can be placed with image guidance, using either intraoperative fluoroscopy or computed tomography (CT) to guide navigation...
February 22, 2017: Spine
https://www.readbyqxmd.com/read/28230398/anticipation-in-manual-tracking-with-multiple-delays
#3
Nigel Stepp, Michael T Turvey
Two experiments are reported showing that behavior exhibited in manual tracking is consistent with behavior predicted by a dynamical systems phenomenon known as anticipating synchronization (Voss, 2000). They extend a prior investigation of the effect of delay on anticipatory manual tracking (Stepp, 2009) by also manipulating coupling strength. The coupling scheme in Experiment 1 and that in Experiment 2 go beyond the single delayed feedback coupling used in previous research and articulations of anticipating synchronization...
February 23, 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/28230386/does-the-cerebellum-contribute-to-human-navigation-by-processing-sequential-information
#4
Anna M Tedesco, Filippo Bianchini, Laura Piccardi, Silvia Clausi, Alain Berthoz, Marco Molinari, Cecilia Guariglia, Maria Leggio
OBJECTIVE: Several authors have proposed that the cerebellum has an important role in functions of higher order as a general mode of sequence detection, independently from the nature of the information. The aim of this study was to verify whether the cerebellum mediates the processing of navigational sequential information and to determine whether it is influenced by the modality of the stimuli presentation. METHOD: We tested 12 cerebellar patients and 12 healthy age-matched participants in 2 comparable navigational tasks (Walking Corsi Test and the Magic Carpet) requiring to memorizing a sequence of spatial locations...
February 23, 2017: Neuropsychology
https://www.readbyqxmd.com/read/28229478/students-experiences-of-role-relationships-and-learning-in-two-clerkship-models
#5
D Jill Konkin, Carol Suddards
CONTEXT: An increasing number of medical schools around the world are implementing longitudinal integrated clerkships (LICs). The University of Alberta's third-year LIC admits a small group of each class. Those not in the LIC undertake a rotation-based clerkship (RBC). All students have a fourth-year RBC. Meaningful participation in patient care and guidance have been identified as affordances for work-based learning. METHODS: This qualitative study is part of an ongoing research programme conducted in a hermeneutic phenomenological frame...
February 22, 2017: Medical Education
https://www.readbyqxmd.com/read/28229169/electrophysiological-evidence-for-enhanced-attentional-deployment-in-spatial-learners
#6
Brandi Lee Drisdelle, Kyoko Konishi, Moussa Diarra, Veronique D Bohbot, Pierre Jolicoeur, Greg L West
Visual spatial attention is important during navigation processes that rely on a cognitive map, because spatial relationships between environmental landmarks need to be selected, encoded, and learned. People who navigate using this strategy are spatial learners, and this process relies on the hippocampus. Conversely, response learners memorize a series of actions to navigate, which relies on the caudate nucleus. Response learning, which is more efficient, is thought to involve less demanding cognitive operations, and is related to reduced grey matter in the hippocampus...
February 22, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28227904/a-potential-function-based-scalpel-navigation-method-that-avoids-blood-vessel-groups-during-excision-of-cancerous-tissue
#7
Hiroshi Noborio, Kazuma Aoki, Takahiro Kunii, Kiminori Mizushino, Hiroshi Noborio, Kazuma Aoki, Takahiro Kunii, Kiminori Mizushino, Hiroshi Noborio, Kazuma Aoki, Kiminori Mizushino, Takahiro Kunii
This study developed support software for liver surgeons; the software can apply potential functions to blood vessels and cancerous tissue and can adjust repulsion and attraction accordingly. Thus, the scalpel can be directly provided with the power to operate on cancerous cells only from a fixed distance, and accidental cutting of blood vessels can be avoided. The direct support provided by this force navigation allows physicians to safely and reliably navigate past blood vessel groups in order to precisely perform excision surgery for liver cancer...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227687/characteristic-of-a-force-sensing-guide-wire-for-minimally-invasive-cardiac-surgery
#8
N Stefanova, M Hessinger, T Opitz, R Werthschutzky, N Stefanova, M Hessinger, T Opitz, R Werthschutzky, N Stefanova, M Hessinger, T Opitz
In minimal invasive cardiac surgery (MICS), the surgeon is missing haptic feedback of the guide wire for navigation through the vessels. A wide range of guide wires with various properties and performance characteristics are available to reduce the risk of complications during the intervention. This paper presents a force sensing guide wire for cardiac catheterization, which provides the surgeon a haptic feedback on the guide wire tip. Three conventional wires for the recanalization of chronic total coronary occlusions (CTO) are investigated and general design requirements for the force sensing guide wire are determined...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227614/portable-prescreening-system-for-sleep-apnea
#9
Martin Kjaer Guul, Poul Jennum, Helge B D Sorensen, Martin Kjaer Guul, Poul Jennum, Helge B D Sorensen, Martin Kjaer Guul, Helge B D Sorensen, Poul Jennum
Obstructive sleep apnea (OSA) occurs in more than 4 % of the adult population. Diagnoses for OSA in sleep clinics are costly and more than half of those submitted to a sleep clinic do not have OSA. A simple, easy, and portable homebased monitoring system to evaluate who are in high-or low risk of suffering from OSA would be beneficial. The system must be able to identify individuals with a high pre-test reliability regarding OSA with the aim of referral and further investigation. We aimed to develop a portable, smartphone, and homebased monitoring system to classify whether a patient screened for sleep apnea is at high risk or low risk of having OSA...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227535/skills-based-evaluation-of-alternative-input-methods-to-command-a-semi-autonomous-electric-wheelchair
#10
Mario Rojas, Pedro Ponce, Arturo Molina, Mario Rojas, Pedro Ponce, Arturo Molina, Pedro Ponce, Mario Rojas, Arturo Molina
This paper presents the evaluation, under standardized metrics, of alternative input methods to steer and maneuver a semi-autonomous electric wheelchair. The Human-Machine Interface (HMI), which includes a virtual joystick, head movements and speech recognition controls, was designed to facilitate mobility skills for severely disabled people. Thirteen tasks, which are common to all the wheelchair users, were attempted five times by controlling it with the virtual joystick and the hands-free interfaces in different areas for disabled and non-disabled people...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227416/3d-2d-ultrasound-feature-based-registration-for-navigated-prostate-biopsy-a-feasibility-study
#11
Sonia Y Selmi, Emmanuel Promayon, Jocelyne Troccaz, Sonia Y Selmi, Emmanuel Promayon, Jocelyne Troccaz, Emmanuel Promayon, Sonia Y Selmi, Jocelyne Troccaz
The aim of this paper is to describe a 3D-2D ultrasound feature-based registration method for navigated prostate biopsy and its first results obtained on patient data. A system combining a low-cost tracking system and a 3D-2D registration algorithm was designed. The proposed 3D-2D registration method combines geometric and image-based distances. After extracting features from ultrasound images, 3D and 2D features within a defined distance are matched using an intensity-based function. The results are encouraging and show acceptable errors with simulated transforms applied on ultrasound volumes from real patients...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227093/applicability-of-ssvep-based-brain-computer-interfaces-for-robot-navigation-in-real-environments
#12
Christina Farmaki, Georgios Christodoulakis, Vangelis Sakkalis, Christina Farmaki, Georgios Christodoulakis, Vangelis Sakkalis, Vangelis Sakkalis, Christina Farmaki, Georgios Christodoulakis
Brain-computer interfaces have been extensively studied and used in order to aid patients suffering from neuromuscular diseases to communicate and control the surrounding environment. Steady-state visual evoked potentials (SSVEP) constitute a very popular BCI stimulation protocol, due to their efficiency and quick response time. In this study, we developed a SSVEP-based BCI along with a low-cost custom radio-controlled robot-car providing live video feedback from a wireless camera mounted on the robot, serving as our testbed...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227062/vision-based-responders-localization-techniques-in-urban-search-and-rescue-scenarios
#13
Zhuorui Yang, Aura Ganz, Zhuorui Yang, Aura Ganz, Zhuorui Yang, Aura Ganz
In this paper, we introduce a vision-based localization algorithm that can accurately track responders during rescue operations in urban areas that are Global Navigation Satellite System (GNSS)-denied. The proposed algorithm works successfully with the rich visual features of an urban environment and obtains an average localization accuracy of 2.5 ft. In addition, we also provide a 3D representation of the disaster field which reflects the current conditions of the site.
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226979/quantitative-assessment-of-arm-tremor-in-people-with-neurological-disorders
#14
Jeonghee Kim, Claire Parnell, Thomas Wichmann, Stephen P DeWeerth, Jeonghee Kim, Claire Parnell, Thomas Wichmann, Stephen P DeWeerth, Claire Parnell, Thomas Wichmann, Stephen P DeWeerth, Jeonghee Kim
Abnormal oscillatory movement (i.e. tremor) is usually evaluated with qualitative assessment by clinicians, and quantified with subjective scoring methods. These methods are often inaccurate. We utilized a quantitative and standardized task based on the Fitts' law to assess the performance of arm movement with tremor by controlling a gyration mouse on a computer. The experiment included the center-out tapping (COT) and rectangular track navigation (RTN) tasks. We report the results of a pilot study in which we collected the performance for healthy participants in whom tremor was simulated by imposing oscillatory movements to the arm with a vibration motor...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226790/the-effect-of-time-pressure-on-stress-levels-during-virtual-wheelchair-navigation
#15
Hachem A Lamti, Philippe Gorce, Hachem A Lamti, Philippe Gorce, Hachem A Lamti, Philippe Gorce
In this work stress is assessed based on EEG features. We focus our efforts on the correlation between subjective ratings and cerebral indices during virtual navigation scenarios. Ten male paraplegic subjects took part in the experiment and navigated in a virtual indoor environment. They had to fulfill two missions where time pressure parameter is introduced. Subjects were equipped with Electroencephalography sensors. Temporal and frequency data were filtered and extracted. A correlation study was conducted based on principal component analysis, Fisher's tests and ANOVA...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225664/historic-leadership
#16
Ellen F Johnsen, Katherine J Pohlman
School nursing practice establishes itself in the midst of both education and nursing philosophies, ethics, standards, laws, and regulations. Treading these two worlds is difficult at times and requires that a school nurse possess a strong foundational knowledge base, seek professional collaboration, and navigate conflicting professional demands in order to promote student and public safety. This article is Part 2 of a four-part series that recounts the inspiring story of a school nurse, Ellen Johnsen, who did just that back in the 1980s in Broken Arrow, Oklahoma...
March 2017: NASN School Nurse
https://www.readbyqxmd.com/read/28225443/bringing-big-data-to-the-forefront-of-healthcare-delivery-the-experience-of-carolinas-healthcare-system
#17
Michael F Dulin, Carol A Lovin, Jean A Wright
The use of big data to transform care delivery is rapidly becoming a reality. To deliver on the promise of value-based care, providers must know the key drivers of wellness at the patient and community levels, as well as understand resource constraints and opportunities to improve efficiency in the health-care system itself. Data are the linchpin. By gathering the right data and finding innovative ways to glean knowledge, we can improve clinical care, advance the health of our communities, improve the lives of our patients, and operate more efficiently...
January 2017: Frontiers of Health Services Management
https://www.readbyqxmd.com/read/28224135/aortic-utero-ovarian-sentinel-nodes-and-left-infrarenal-aortic-lymph-node-dissection-by-icg-supported-navigation
#18
Rainer Kimmig, Peter Rusch, Paul Buderath, Bahriye Aktas
•Visualization of paraaortic sentinel compartments in endometrial cancer•Nerve sparing dissection of left paraaortic infrarenal lymph compartment•Educational video may be basis for standardization of paraaortic sentinel node dissection.
May 2017: Gynecologic Oncology Reports
https://www.readbyqxmd.com/read/28223931/a-computational-model-for-spatial-navigation-based-on-reference-frames-in-the-hippocampus-retrosplenial-cortex-and-posterior-parietal-cortex
#19
Timo Oess, Jeffrey L Krichmar, Florian Röhrbein
Behavioral studies for humans, monkeys, and rats have shown that, while traversing an environment, these mammals tend to use different frames of reference and frequently switch between them. These frames represent allocentric, egocentric, or route-centric views of the environment. However, combinations of either of them are often deployed. Neurophysiological studies on rats have indicated that the hippocampus, the retrosplenial cortex, and the posterior parietal cortex contribute to the formation of these frames and mediate the transformation between those...
2017: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/28223832/time-and-resources-of-peripherally-inserted-central-catheter-insertion-procedures-a-comparison-between-blind-insertion-chest-x-ray-and-a-real-time-tip-navigation-and-confirmation-system
#20
Kenneth J Tomaszewski, Nicole Ferko, Sarah S Hollmann, Simona C Eng, Howard M Richard, Lynn Rowe, Susan Sproule
BACKGROUND: The Sherlock 3CG™ Tip Confirmation System (TCS) provides real-time peripherally inserted central catheter (PICC) tip insertion information using passive magnetic navigation and patient cardiac electrical activity. It is an alternative tip confirmation method to fluoroscopy or chest X-ray for PICC tip insertion confirmation in adults. The purpose of this study was to evaluate time and cost of the Sherlock 3CG TCS and blind insertion with chest X-ray tip confirmation (BI/CXR) for PICC insertions...
2017: ClinicoEconomics and Outcomes Research: CEOR
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