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https://www.readbyqxmd.com/read/28914926/single-polarization-fiber-pigtailed-high-finesse-silica-waveguide-ring-resonator-for-a-resonant-micro-optic-gyroscope
#1
Jianjie Zhang, Huilian Ma, Hanzhao Li, Zhonghe Jin
A new record for high-finesse silica waveguide ring resonators (WRRs), to the best of our knowledge, is demonstrated experimentally. The achieved finesse and resonant depths of the silica WRR with a length of 7.9 cm and a diameter of 2.5 cm are 196.7% and 98%, respectively. In addition, the silica WRR chip is coupled with single-polarization fiber to improve the polarization extinction ratio (PER) and, thus, to reduce the polarization error. With the application of this high-finesse and high-PER WRR to the resonant micro-optic gyroscope (RMOG), a bias stability of 0...
September 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28902149/highly-portable-sensor-based-system-for-human-fall-monitoring
#2
Aihua Mao, Xuedong Ma, Yinan He, Jie Luo
Falls are a very dangerous situation especially among elderly people, because they may lead to fractures, concussion, and other injuries. Without timely rescue, falls may even endanger their lives. The existing optical sensor-based fall monitoring systems have some disadvantages, such as limited monitoring range and inconvenience to carry for users. Furthermore, the fall detection system based only on an accelerometer often mistakenly determines some activities of daily living (ADL) as falls, leading to low accuracy in fall detection...
September 13, 2017: Sensors
https://www.readbyqxmd.com/read/28891942/automatic-classification-of-tremor-severity-in-parkinson-s-disease-using-a-wearable-device
#3
Hyoseon Jeon, Woongwoo Lee, Hyeyoung Park, Hong Ji Lee, Sang Kyong Kim, Han Byul Kim, Beomseok Jeon, Kwang Suk Park
Although there is clinical demand for new technology that can accurately measure Parkinsonian tremors, automatic scoring of Parkinsonian tremors using machine-learning approaches has not yet been employed. This study aims to fill this gap by proposing machine-learning algorithms as a way to predict the Unified Parkinson's Disease Rating Scale (UPDRS), which are similar to how neurologists rate scores in actual clinical practice. In this study, the tremor signals of 85 patients with Parkinson's disease (PD) were measured using a wrist-watch-type wearable device consisting of an accelerometer and a gyroscope...
September 9, 2017: Sensors
https://www.readbyqxmd.com/read/28884239/nano-composite-foam-sensor-system-in-football-helmets
#4
A Jake Merrell, William F Christensen, Matthew K Seeley, Anton E Bowden, David T Fullwood
American football has both the highest rate of concussion incidences as well as the highest number of concussions of all contact sports due to both the number of athletes and nature of the sport. Recent research has linked concussions with long term health complications such as chronic traumatic encephalopathy and early onset Alzheimer's. Understanding the mechanical characteristics of concussive impacts is critical to help protect athletes from these debilitating diseases and is now possible using helmet-based sensor systems...
September 7, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28880843/a-novel-dual-gating-approach-using-joint-inertial-sensors-implications-for-cardiac-pet-imaging
#5
Mojtaba Jafari Tadi, Jarmo Teuho, Eero Lennart Lehtonen, Antti Saraste, Mikko Pänkäälä, Tero Koivisto, Mika Teras
Positron emission tomography (PET) is a non-invasive imaging technique which may be considered as the state of art for the examination of cardiac inflammation due to atherosclerosis. A fundamental limitation of PET is that cardiac and respiratory motions reduce the quality of the achieved images. Current approaches for motion compensation involve gating the PET data based on the timing of quiescent periods of cardiac and respiratory cycles. In this study, we present a novel gating method called microelectromechanical (MEMS) dual gating which relies on joint non-electrical sensors, i...
September 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28880203/temperature-dependence-of-faraday-effect-induced-bias-error-in-a-fiber-optic-gyroscope
#6
Xuyou Li, Pan Liu, Xingxing Guang, Zhenlong Xu, Lianwu Guan, Guangchun Li
Improving the performance of interferometric fiber optic gyroscope (IFOG) in harsh environments, such as magnetic field and temperature field variation, is necessary for its practical applications. This paper presents an investigation of Faraday effect-induced bias error of IFOG under varying temperature. Jones matrix method is utilized to formulize the temperature dependence of Faraday effect-induced bias error. Theoretical results show that the Faraday effect-induced bias error changes with the temperature in the non-skeleton polarization maintaining (PM) fiber coil...
September 7, 2017: Sensors
https://www.readbyqxmd.com/read/28878177/authentication-of-smartphone-users-based-on-activity-recognition-and-mobile-sensing
#7
Muhammad Ehatisham-Ul-Haq, Muhammad Awais Azam, Jonathan Loo, Kai Shuang, Syed Islam, Usman Naeem, Yasar Amin
Smartphones are context-aware devices that provide a compelling platform for ubiquitous computing and assist users in accomplishing many of their routine tasks anytime and anywhere, such as sending and receiving emails. The nature of tasks conducted with these devices has evolved with the exponential increase in the sensing and computing capabilities of a smartphone. Due to the ease of use and convenience, many users tend to store their private data, such as personal identifiers and bank account details, on their smartphone...
September 6, 2017: Sensors
https://www.readbyqxmd.com/read/28873876/inertial-measurement-techniques-for-human-joints-movement-analysis
#8
Harriet Nwaizu, Reza Saatchi, Derek Burke
Development and assessment of techniques that allow inertia measurement units consisting of an accelerometer and a gyroscope to be used for monitoring human joints' movements are presented. A new wavelet packet decomposition technique was developed that denoised the accelerometer signals. Investigations on the use of accelerometers to analyse legs' movements are described.
2017: Studies in Health Technology and Informatics
https://www.readbyqxmd.com/read/28873025/analysis-of-head-impacts-during-sub-elite-hurling-practice-sessions
#9
D O'Sullivan, M Roe, C Blake
The reported incidence of head and neck injuries in hurling is 0.12 per 1000 hours, but no previous research has quantified head impact characteristics in this sport. Here, a wireless accelerometer and gyroscope captured head impacts, in 20 senior club level hurling players. Peak linear and rotational acceleration and impact location were recorded during three hurling training sessions, each player participating once. A mean of 27.9 impacts (linear acceleration >10g) per player, per session were recorded; 1314 impacts during a total exposure time of 247 minutes...
September 5, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28872352/patient-movement-characteristics-and-the-impact-on-cbct-image-quality-and-interpretability
#10
Rubens Spin-Neto, Cláudio Costa, Daniela Mra Salgado, Nataly Rm Zambrana, Erik Gotfredsen, Ann Wenzel
OBJECTIVES: To assess the impact of patient movement characteristics and metal/radiopaque materials in the field-of-view (FOV) on CBCT image quality and interpretability. METHODS: 162 CBCT examinations were performed in 134 consecutive (i.e. prospective data collection) patients (age average: 27.2 years; range: 9-73). An accelerometer-gyroscope system registered patient's head position during examination. The threshold for movement definition was set at ≥0...
September 5, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28869507/investigation-on-eigenfrequency-of-a-cylindrical-shell-resonator-under-resonator-top-trimming-methods
#11
Kai Zeng, Youwang Hu, Guiling Deng, Xiaoyan Sun, Wenyi Su, Yunpeng Lu, Ji'an Duan
The eigenfrequency of a resonator plays a significant role in the operation of a cylindrical shell vibrating gyroscope, and trimming is aimed at eliminating the frequency split that is the difference of eigenfrequency between two work modes. In this paper, the effects on eigenfrequency under resonator-top trimming methods that trim the top of the resonator wall are investigated by simulation and experiments. Simulation results show that the eigenfrequency of the trimmed mode increases in the holes-trimming method, whereas it decreases in the grooves-trimming method...
September 2, 2017: Sensors
https://www.readbyqxmd.com/read/28852889/objective-assessment-of-bradykinesia-estimated-from-the-wrist-extension-in-older-adults-and-patients-with-parkinson-s-disease
#12
Amanda Gomes Rabelo, Lucio Pereira Neves, Ana Paula S Paixão, Fábio Henrique Monteiro Oliveira, Luciane Aparecida Pascucci Sande de Souza, Marcus Fraga Vieira, Adriano A Pereira, Adriano O Andrade
Parkinson's disease (PD) presents several motor signs, including tremor and bradykinesia. However, these signs can also be found in other motor disorders and in neurologically healthy older adults. The incidence of bradykinesia in PD is relatively high in all stages of the disorder, even when compared to tremor. Thus, this research proposes an objective assessment of bradykinesia in patients with PD (G PD: 15 older adults with Parkinson's disease, 65.3 ± 9.1 years) and older adults (G HV: 12 healthy older adults, 60...
August 29, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28845239/kinematic-characteristics-of-infant-leg-movements-produced-across-a-full-day
#13
Ivan A Trujillo-Priego, Beth A Smith
INTRODUCTION: Our purpose is to directly measure variability in infant leg movement behavior in the natural environment across a full day. We recently we created an algorithm to identify an infant-produced leg movement from full-day wearable sensor data from infants with typical development between 1 and 12 months of age. Here we report the kinematic characteristics of their leg movements produced across a full day. METHODS: Wearable sensor data were collected from 12 infants with typical development for 8-13 hours per day...
January 2017: Journal of Rehabilitation and Assistive Technologies Engineering
https://www.readbyqxmd.com/read/28817078/measurement-of-the-verdet-constant-of-polarization-maintaining-air-core-photonic-bandgap-fiber
#14
Ningfang Song, Xiaoyang Wang, Xiaobin Xu, Wei Cai, Chunxiao Wu
We propose a method based on the white-light interference technique for measuring the Verdet constant of a polarization-maintaining air-core photonic bandgap fiber (PM-PBF). The experimental results show that the Verdet constant of the PM-PBF is ~3.3 mrad/T/m for the broadband light with a spectral width of ~38 nm and a mean wavelength of ~1550 nm, which is ~124 times less than that of a conventional stress-induced birefringent fibers called PANDA fibers (~0.41 rad/T/m for the same broad-spectrum light). The results indicate that the nonreciprocal error induced by the Faraday effect in a fiber optic gyroscope (FOG) made of the PM-PBF is theoretically ~25 times less than that of a conventional FOG made of the PANDA fiber when other conditions, such as the fiber twist, fiber coil area, and so on, are the same...
August 17, 2017: Sensors
https://www.readbyqxmd.com/read/28814041/assessing-bradykinesia-in-parkinson-s-disease-using-gyroscope-signals
#15
S Summa, J Tosi, F Taffoni, L Di Biase, M Marano, A Cascio Rizzo, M Tombini, G Di Pino, D Formica
Parkinson's disease (PD) is a neurodegenerative brain disorder that slowly brings on the dopaminergic neurons death. The depletion of the dopaminergic signal causes the onset of motor symptoms such as tremor, bradykinesia and rigidity. Usually, neurologists regularly monitor motor symptoms and motor fluctuations using the MDS-UPDRS part III clinical scale. Nevertheless, to have a more objective and quantitative evaluation, it is possible to assess the cardinal motor symptoms of PD using wearable sensors and portable robotic devices...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28809669/muscle-activation-and-inertial-motion-data-for-non-invasive-classification-of-activities-of-daily-living
#16
Michael S Totty, Eric Wade
OBJECTIVE: Remote monitoring of physical activity using body-worn sensors provides an objective alternative to current functional assessment tools. The purpose of this study was to assess the feasibility of classifying categories of activities of daily living from the Functional Arm Activity Behavioral Observation System (FAABOS) using muscle activation and motion data. METHODS: Ten non-disabled, healthy adults were fitted with a Myo armband on the upper forearm...
August 10, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28806627/a-novel-clinical-evaluation-method-using-maximum-angular-velocity-during-knee-extension-to-assess-lower-extremity-muscle-function-of-older-adults
#17
Takeshi Arai, Shuichi Obuchi, Yoshitaka Shiba
The purpose of this study is to examine the utilities of maximum angular velocity (AV) assessment during knee extension (KE) using a gyroscope for clinical evaluation of exercise program for older adults. Two hundred and 4 community-dwelling older adults underwent a 3-month exercise intervention program. Outcome measures included AV during KE and other physical functions (isometric strength (IS), walking abilities, and balance functions). A correlation coefficient was used to evaluate the relationships between AV and other physical functions at baseline...
August 3, 2017: Archives of Gerontology and Geriatrics
https://www.readbyqxmd.com/read/28754888/gyrocardiography-a-new-non-invasive-monitoring-method-for-the-assessment-of-cardiac-mechanics-and-the-estimation-of-hemodynamic-variables
#18
Mojtaba Jafari Tadi, Eero Lehtonen, Antti Saraste, Jarno Tuominen, Juho Koskinen, Mika Teräs, Juhani Airaksinen, Mikko Pänkäälä, Tero Koivisto
Gyrocardiography (GCG) is a new non-invasive technique for assessing heart motions by using a sensor of angular motion - gyroscope - attached to the skin of the chest. In this study, we conducted simultaneous recordings of electrocardiography (ECG), GCG, and echocardiography in a group of subjects consisting of nine healthy volunteer men. Annotation of underlying fiducial points in GCG is presented and compared to opening and closing points of heart valves measured by a pulse wave Doppler. Comparison between GCG and synchronized tissue Doppler imaging (TDI) data shows that the GCG signal is also capable of providing temporal information on the systolic and early diastolic peak velocities of the myocardium...
July 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28754335/reliability-assessment-of-measuring-active-wrist-pronation-and-supination-range-of-motion-with-a-smartphone
#19
C Santos, N Pauchard, A Guilloteau
This study aimed to improve clinical examination techniques by determining the reliability of different methods to evaluate forearm movements. Two methods using the iPhone™ 5 and its gyroscope application (alone [I5] or attached to a selfie stick [ISS]) were compared with two conventional measurement devices (a plastic goniometer with a hand-held pencil [HHP] and a bubble goniometer [BG]) to evaluate the active range of movement (AROM) of the wrist during pronation and supination. Two independent groups of subjects took part in this prospective single-center diagnostic study: 20 healthy subjects and 20 patients...
July 25, 2017: Hand Surgery and Rehabilitation
https://www.readbyqxmd.com/read/28729643/superhydrophobic-drag-reduction-spherical-bearing-fabricated-by-laser-ablation-and-pei-regulated-zno-nanowire-growth
#20
Rui Weng, Haifeng Zhang, Yanjing Tuo, Yang Wang, Xiaowei Liu
The resistance of the bearing is a significant factor affecting the performance of the ball-disk rotor gyroscope. The micro and nano combined surface with low surface energy material modifications can be hydrophobic. This can reduce the drag when the bearing is lubricated by deionized water. Laser ablation method is utilized to form micron-scaled structures on the surface of the stainless steel rotor ball. And the nanostructures are formed by PEI (Polyetherimide) regulated ZnO nanowires growth. After low surface energy material modification, the water contact angle of processed surface was 163° and the sliding angle was less than 4°...
July 20, 2017: Scientific Reports
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