keyword
MENU ▼
Read by QxMD icon Read
search

frequency compression

keyword
https://www.readbyqxmd.com/read/28227278/low-complexity-prediction-of-frequency-rich-biosignals-for-lossless-compression-in-wearable-technologies
#1
Guangwei Chen, Stuart A Bowyer, Esther Rodriguez-Villegas, Guangwei Chen, Stuart A Bowyer, Esther Rodriguez-Villegas, Guangwei Chen, Esther Rodriguez-Villegas, Stuart A Bowyer
Wearable technologies that store, monitor and analyse a range of biosignals are an area of significant growth and interest for both industry and academia. The rate of data generation in these devices poses a considerable challenge with regards to the bandwidths of wireless transmission protocols, local storage capacities and the on-board power consumption requirements. This issue is particularly acute for frequency-rich biosignals containing significant higher frequency components that are un-served by conventional compression techniques...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226530/low-rank-magnetic-resonance-fingerprinting
#2
Gal Mazor, Lior Weizman, Assaf Tal, Yonina C Eldar, Gal Mazor, Lior Weizman, Assaf Tal, Yonina C Eldar, Gal Mazor, Assaf Tal, Lior Weizman, Yonina C Eldar
Magnetic Resonance Fingerprinting (MRF) is a relatively new approach that provides quantitative MRI using randomized acquisition. Extraction of physical quantitative tissue values is preformed off-line, based on acquisition with varying parameters and a dictionary generated according to the Bloch equations. MRF uses hundreds of radio frequency (RF) excitation pulses for acquisition, and therefore high under-sampling ratio in the sampling domain (k-space) is required. This under-sampling causes spatial artifacts that hamper the ability to accurately estimate the quantitative tissue values...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28218673/a-high-performance-piezoelectric-sensor-for-dynamic-force-monitoring-of-landslide
#3
Ming Li, Wei Cheng, Jiangpan Chen, Ruili Xie, Xiongfei Li
Due to the increasing influence of human engineering activities, it is important to monitor the transient disturbance during the evolution process of landslide. For this purpose, a high-performance piezoelectric sensor is presented in this paper. To adapt the high static and dynamic stress environment in slope engineering, two key techniques, namely, the self-structure pressure distribution method (SSPDM) and the capacitive circuit voltage distribution method (CCVDM) are employed in the design of the sensor...
February 17, 2017: Sensors
https://www.readbyqxmd.com/read/28216125/population-responses-in-primary-auditory-cortex-simultaneously-represent-the-temporal-envelope-and-periodicity-features-in-natural-speech
#4
Daniel A Abrams, Trent Nicol, Travis White-Schwoch, Mitra Hartmann, Steven Zecker, Nina Kraus
Speech perception relies on a listener's ability to simultaneously resolve multiple temporal features in the speech signal. Little is known regarding neural mechanisms that enable the simultaneous coding of concurrent temporal features in the speech signal. Here we show that two categories of temporal features in speech, the low-frequency speech envelope and periodicity cues, are processed by distinct neural mechanisms within the same population of cortical neurons. We measured population activity in primary auditory cortex of anesthetized guinea pig in response to three variants of a naturally produced speech sentence...
February 16, 2017: Hearing Research
https://www.readbyqxmd.com/read/28214338/sciatic-neuropathy-due-to-popliteal-fossa-nerve-block
#5
Adam Aubuchon, W David Arnold, Anna Bracewell, J Chad Hoyle
INTRODUCTION: Sciatic neuropathy following popliteal nerve block (PNB) for regional anesthesia is considered uncommon but has been increasingly recognized in the literature. We identified a case of sciatic neuropathy that occurred after bunionectomy during which a PNB had been performed. METHODS: To understand the frequency of PNB-related sciatic neuropathy we performed a retrospective review of sciatic neuropathies at our center over a five year period. RESULTS: Forty-five cases of sciatic neuropathy were reviewed...
February 18, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28213250/novel-electroanalytical-method-based-on-the-electrostriction-phenomenon-and-its-application-to-determination-of-cr-vi-by-the-flow-injection-technique
#6
Marcin Wieczorek, Jolanta Kochana, Paweł Knihnicki, Karolina Wapiennik, Paweł Kościelniak
The electrostriction phenomenon is observed in membranes of thickness in the nanometer range, e.g. bilayer lipid membranes or self-assembled monolayers. Strong electrical field of 105-106V/cm in intensity appears when applying the potential lower than 1V to these membranes. Electrostatic forces change the dimensions of a dielectric, hence the membrane compression and decrease in thickness are observed. As a result, increase in the membrane capacitance is recorded. The presented work covers development and application of a new analytical method based on the innovative capacitance-to-frequency conversion method and flow technique...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28210025/vascular-lipoleiomyoma-of-the-uterus-an-unusual-case
#7
Vesna Chibisheva, Vesna Antovska, Milka Trajanova, Drage Dabeski, Rubens Jovanovic, Ivana Kijajova
INTRODUCTION: Uterine lipoleiomyomas are a rare type of uterine myomas, which have been seldom diagnosed and are less known and still unusual. Histologically they are composed of smooth muscle cells with multiple fat cells and fibrous tissue. Their pathogenesis is still a stigmata and their preoperative diagnosis is still questionable. CASE REPORT HISTORY: A 39-year old woman presented at the University clinic for obstetrics and gynecology with complaints of a mild low abdominal and pelvic pain, increased frequency of vaginal bleeding and abdominal distension...
December 2016: Medical Archives
https://www.readbyqxmd.com/read/28208953/open-reduction-and-volar-plate-fixation-of-dorsally-displaced-distal-radius-fractures-a-prospective-study-of-functional-and-radiological-outcomes
#8
Arjun Ballal, Anand Kumar Sadasivan, Anoop Hegde, Ashwin Shetty
INTRODUCTION: The fractures of the distal radius have always posed a unique challenge to the orthopaedic fraternity. The complex ligamentous and bony anatomy offers a wide variety of fractures to be dealt with around this zone. Over the years these injuries have become common especially in the elderly age group as well as the implants and surgical techniques have improved. AIM: To assess the radiological and functional outcome after fixation of intra-articular dorsally displaced distal radius fractures with open reduction and volar Locking Compression Plate fixation (LCP)...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28208133/how-truncating-are-truncating-languages-evidence-from-russian-and-german
#9
Tamara V Rathcke
Russian and German have pr eviously been described as 'truncating', or cutting off target frequencies of the phrase-final pitch trajectories when the time available for voicing is compromised. However, supporting evidence is rare and limited to only a few pitch categories. This paper reports a production study conducted to document pitch adjustments to linguistic materials, in which the amount of voicing available for the realization of a pitch pattern varies from relatively long to extremely short. Productions of nuclear H+L*, H* and L*+H pitch accents followed by a low boundary tone were investigated in the two languages...
2016: Phonetica
https://www.readbyqxmd.com/read/28198845/picosecond-kilohertz-class-cryogenically-cooled-multistage-yb-doped-chirped-pulse-amplifier
#10
F X Morrissey, T Y Fan, D E Miller, D Rand
A multistage cryogenic chirped pulse amplifier has been developed, utilizing two different Yb-doped gain materials in subsequent amplifier stages. A Yb:GSAG regenerative amplifier followed by a Yb:YAG power amplifier is able to deliver pulses with a broader bandwidth than a system using only one of these two gain media throughout. We demonstrate 90 mJ of pulse energy (113 W of average power) uncompressed and 67 mJ (84 W of average power) compressed at 1.25 kHz pulse repetition frequency, 3.0 ps FWHM Gaussian pulse width, and near-diffraction-limited (M<sup>2</sup><1...
February 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28195835/neonatal-resuscitation-program-rolling-refresher-maintaining-chest-compression-proficiency-through-the-use-of-simulation-based-education
#11
Jose R Cepeda Brito, Patrick G Hughes, Kimberly S Firestone, Fabiana Ortiz Figueroa, Karan Johnson, Terra Ruthenburg, Robyn McKinney, M David Gothard, Rami Ahmed
BACKGROUND: Structured training courses have shown to improve patient outcomes; however, guidelines are inconsistently applied in up to 50% of all neonatal resuscitations. This is partly due to the fact that psychomotor skills needed for resuscitation decay within 6 months to a year from the completion of a certification course. Currently, there are no recommendations on how often refresher training should occur to prevent skill decay. PURPOSE: Improve provider proficiency and confidence in the performance of neonatal resuscitation with a focus on chest compression effectiveness...
February 10, 2017: Advances in Neonatal Care: Official Journal of the National Association of Neonatal Nurses
https://www.readbyqxmd.com/read/28176677/predicting-burst-pressure-of-radiofrequency-induced-colorectal-anastomosis-by-bio-impedance-measurement
#12
Lingxi Zhao, Yu Zhou, Chengli Song, Zhigang Wang, Alfred Cuschieri
The present study investigates the relationship between bio-impedance and burst pressure of colorectal anastomosis created by radiofrequency (RF)-induced tissue fusion. Colorectal anastomosis were created with ex vivo porcine colorectal segments, during which 5 levels of compression pressure were applied by a custom-made bipolar prototype, with 5 replicate experiments at each compression pressure. Instant anastomotic tensile strength was assessed by burst pressure. Bio-impedance of fused tissue was measured by Impedance Analyzer across frequency that 100 Hz to 3 MHz...
February 8, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28158122/high-resolution-wavelet-fractal-compressed-optical-coherence-tomography-images
#13
Mekhalfa Faiza, Saba Adabi, Berkani Daoud, Mohammad R N Avanaki
Three-dimensional (3D) optical coherence tomography (OCT) images could assist specialists in the diagnosis of a disease in a tissue by providing morphological information from it. Since the size of such images is usually extremely large, an appropriate image compression method can help in the storage and transmission of these images. Fractal image compression provides very high compression ratios, and discrete wavelet transform (DWT) retains frequency and spatial information in the signal. In order to combine these two techniques, fractal coding has to be performed in the wavelet domain...
February 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28158070/biaxial-stress-and-optoelectronic-properties-of-al-doped-zno-thin-films-deposited-on-flexible-substrates-by-radio-frequency-magnetron-sputtering
#14
Hsi-Chao Chen, Po-Wei Cheng, Kuo-Ting Huang
Transparent conductive Al-doped ZnO (AZO) thin films were deposited on polyethylene terephthalate (PET) and polycarbonate (PC) substrates using radio frequency (RF) magnetron sputtering. The biaxial stress was measured with a double beam shadow moiré interferometer, and x-ray diffraction (XRD) was used to investigate the crystal orientation of ZnO. The substrate temperature was varied from room temperature to 150°C in steps of 25°C. The experimental results showed that the residual and shearing stresses increased with the increase in substrate temperature...
February 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28153344/frequency-of-pocket-hematoma-in-patients-receiving-vitamin-k-antagonist-and-antiplatelet-therapy-at-the-time-of-pacemaker-or-cardioverter-defibrillator-implantation-from-the-pocket-study
#15
Michele Malagù, Filippo Trevisan, Antonella Scalone, Lina Marcantoni, Giuseppe Sammarco, Matteo Bertini
In patients undergoing cardiac device implantation, anticoagulant and antiplatelet therapy are associated with an increased risk of pocket hematoma. In case of vitamin K antagonist therapy, a strategy of continued warfarin with no heparin bridge showed a reduction of pocket hematoma. Evidence regarding antiplatelet therapy management is limited. This is a single-center observational study which reflects our systematic approach to the problem. In 2012, we proposed an improved management protocol for anticoagulant and antiplatelet therapy (no-bridge protocol) based on individual thromboembolic risk stratification, noninterruption of oral anticoagulation, no bridge with heparin and elastic adherence compression bandage...
January 6, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28150278/the-quality-of-a-newly-developed-infant-chest-compression-method-applied-by-paramedics-a-randomized-crossover-manikin-trial
#16
Jacek Smereka, Mariusz Kasinski, Adam Smereka, Jerzy Robert Ładny, Łukasz Szarpak
BACKGROUND: The etiology of sudden cardiac arrest in infants is different from that in adults, with respiratory failure, sudden infant death syndrome, and drowning being the primary causes in the former. According to the European Resuscitation Council (ERC) and American Heart Association (AHA) recommendations, the quality of chest compressions (CC) is a key element affecting the effectiveness of cardiopulmonary resuscitation (CPR). The current ERC and AHA guidelines recommend the 'two-finger technique' (TFT) or 'two-thumb encircling hands technique' (TTHT) for external CCs during infant CPR...
February 2, 2017: Kardiologia Polska
https://www.readbyqxmd.com/read/28149567/minimalist-video-assisted-thoracic-surgery-biopsy-of-mediastinal-tumors
#17
Federico Tacconi, Paola Rogliani, Benedetto Cristino, Francesco Gilardi, Leonardo Palombi, Eugenio Pompeo
BACKGROUND: Mediastinal tumors often require surgical biopsy to achieve a precise and rapid diagnosis. However, subjects with mediastinal tumors may be unfit for general anesthesia, particularly when compression of major vessels or airways does occur. We tested the applicability in this setting of a minimalist (M) uniportal, video-assisted thoracic surgery (VATS) strategy carried out under locoregional anesthesia in awake patients (MVATS). METHODS: We analyzed in a comparative fashion including propensity score matching, data from a prospectively collected database of patients who were offered surgical biopsy for mediastinal tumors through either MVATS or standard VATS...
December 2016: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28147570/adaptive-and-compressive-matched-field-processing
#18
Kay L Gemba, William S Hodgkiss, Peter Gerstoft
Matched field processing is a generalized beamforming method that matches received array data to a dictionary of replica vectors in order to locate one or more sources. Its solution set is sparse since there are considerably fewer sources than replicas. Using compressive sensing (CS) implemented using basis pursuit, the matched field problem is reformulated as an underdetermined, convex optimization problem. CS estimates the unknown source amplitudes using the replica dictionary to best explain the data, subject to a row-sparsity constraint...
January 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28146484/high-spatial-resolution-phase-sensitive-optical-time-domain-reflectometer-with-a-frequency-swept-pulse
#19
Bin Lu, Zhengqing Pan, Zhaoyong Wang, Hanrong Zheng, Qing Ye, Ronghui Qu, Haiwen Cai
A high spatial resolution phase-sensitive optical time domain reflectometer (ϕ-OTDR) with an optical frequency-swept pulse (FSP) is proposed, and the experimental results are presented in the Letter. The FSP ϕ-OTDR uses optical pulses with linear frequency modulation with higher pulse energy for longer sensing fiber and uses matched filter in the receiver to compress the processed pulse width. Thus, the contradiction between spatial resolution and the working distance in ordinary ϕ-OTDR is relaxed. A spatial resolution of 30 cm, a sensing distance of 19...
February 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28143962/pressures-and-oscillation-frequencies-generated-by-bubble-positive-expiratory-pressure-devices
#20
Mary D Santos, Maree A Milross, John P Eisenhuth, Jennifer A Alison
BACKGROUND: Positive expiratory pressure (PEP) devices are used to assist with airway clearance. Little is known about the therapist-made or commercially available bubble-PEP devices. The aim of this study was to determine the end-expiratory pressures (cm H2O) and oscillation frequencies (Hz) generated when a range of flows were applied to the therapist-made bubble-PEP devices (Bubble-PEP-3cm and Bubble-PEP-0cm) and commercial bubble-PEP devices (AguaPEP, Hydrapep, and Therabubble). METHODS: This was a bench-top experimental study using a compressed air source, flow rotameter (flows of 5, 10, 15, 20, and 25 L/min), and pressure transducer...
January 31, 2017: Respiratory Care
keyword
keyword
90413
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"