396 research outputs found
Incidental Detection of Internal Jugular Vein Thrombosis Secondary to Undiagnosed Benign Substernal Goiter
Internal jugular vein thrombosis is a serious event with potentially fatal outcome, where the clinical symptoms may be vague or absent. This paper refers to a rare case where routine carotid Doppler ultrasound prior to coronary artery bypass grafting (CABG) and aortic valve replacement (AVR) in a 76-year-old man, incidentally revealed thrombosis of the right internal jugular vein. Thoracic CT demonstrated an underlying, large, benign substernal multinodular goiter, mainly involving the right lobe, causing compression and displacement of the great vessels. A successful, one-stage operation including ligation of the internal jugular vein to avoid pulmonary embolism and hemithyroidectomy, combined with the scheduled CABG and AVR, was performed.
This case illustrates that benign substernal goiter may be associated with asymptomatic internal jugular vein thrombosis. Carotid Doppler ultrasound should involve evaluation of the internal jugular vein concerning thrombosis as its presence may reveal space-occupying lesions in the thorax
A Unified Approach for Multi-Scale Synchronous Correlation Search in Big Time Series -- Full Version
The wide deployment of IoT sensors has enabled the collection of very big
time series across different domains, from which advanced analytics can be
performed to find unknown relationships, most importantly the correlations
between them. However, current approaches for correlation search on time series
are limited to only a single temporal scale and simple types of relations, and
cannot handle noise effectively. This paper presents the integrated SYnchronous
COrrelation Search (iSYCOS) framework to find multi-scale correlations in big
time series. Specifically, iSYCOS integrates top-down and bottom-up approaches
into a single auto-configured framework capable of efficiently extracting
complex window-based correlations from big time series using mutual information
(MI). Moreover, iSYCOS includes a novel MI-based theory to identify noise in
the data, and is used to perform pruning to improve iSYCOS performance.
Besides, we design a distributed version of iSYCOS that can scale out in a
Spark cluster to handle big time series. Our extensive experimental evaluation
on synthetic and real-world datasets shows that iSYCOS can auto-configure on a
given dataset to find complex multi-scale correlations. The pruning and
optimisations can improve iSYCOS performance up to an order of magnitude, and
the distributed iSYCOS can scale out linearly on a computing cluster.Comment: 18 page
Pump-probe coupling of matter wave packets to remote lattice states
The coherent manipulation of wave packets is an important tool in many areas
of physics. We demonstrate the experimental realization of quasi-free wave
packets of ultra-cold atoms bound by an external harmonic trap. The wave
packets are produced by modulating the intensity of an optical lattice
containing a Bose-Einstein condensate. The evolution of these wave packets is
monitored in-situ and their reflection on a band gap is observed. In direct
analogy with pump-probe spectroscopy, a probe pulse allows for the resonant
de-excitation of the wave packet into localized lattice states at a long,
controllable distance of more than 100 lattice sites from the main component.
This coherent control mechanism for ultra-cold atoms thus enables controlled
quantum state preparation, opening exciting perspectives for quantum metrology
and simulation.Comment: 5 pages, 5 figure
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