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Andriy I Tsvyakh, Andriy J Hospodarskyy
INTRODUCTION: Timely access to orthopedic rehabilitation is an important problem for the Ukrainian healthcare system. The international orthopedic community aims to achieve the best possible outcome for patient care by modifying rehabilitation methods and using telemedicine technology. The theme of this article is to discuss the integration of telemedicine technology in the rehabilitation of patients with injuries of the lower extremities. MATERIALS AND METHODS: Consecutive patients were recruited over a 2-year period...
May 19, 2017: Telemedicine Journal and E-health: the Official Journal of the American Telemedicine Association
Jesús D Cerón, Diego M López, Christian Hofmann
BACKGROUND: Among the factors that outline the health of populations, person's lifestyle is the more important one. This work focuses on the caracterization and prevention of sedentary lifestyles. A sedentary behavior is defined as "any waking behavior characterized by an energy expenditure of 1.5 METs (Metabolic Equivalent) or less while in a sitting or reclining posture". OBJECTIVE: To propose a method for sedentary behaviors classification using a smartphone and Bluetooth beacons considering different types of classification models: personal, hybrid or impersonal...
2017: Studies in Health Technology and Informatics
Ian S Osborne
No abstract text is available yet for this article.
May 5, 2017: Science
Jiangkun Sun, Yulie Wu, Xiang Xi, Yongmeng Zhang, Xuezhong Wu
The cylindrical resonator gyroscope (CRG) is a typical Coriolis vibratory gyroscope whose performance is mostly influenced by the damping characteristic of the cylindrical resonator. However, the tremendous damping influences caused by pasting piezoelectric electrodes on the gyroscope, which degrades the performance to a large extent, have rarely been studied. In this paper, the dynamical model is established to analyze various forms of energy consumption. In addition, a FE COMSOL model is also created to discuss the damping influences of several significant parameters of the adhesive layer and piezoelectric electrodes, respectively, and then explicit influence laws are obtained...
May 4, 2017: Sensors
Yang Gao, Hongsheng Li, Libin Huang, Hui Sun
This paper presents the design and application of a lever coupling mechanism to improve the shock resistance of a dual-mass silicon micro-gyroscope with drive mode coupled along the driving direction without sacrificing the mechanical sensitivity. Firstly, the mechanical sensitivity and the shock response of the micro-gyroscope are theoretically analyzed. In the mechanical design, a novel lever coupling mechanism is proposed to change the modal order and to improve the frequency separation. The micro-gyroscope with the lever coupling mechanism optimizes the drive mode order, increasing the in-phase mode frequency to be much larger than the anti-phase one...
April 30, 2017: Sensors
Jiaxiao Xue, Zhou Guan, Jiaping Lin, Chunhua Cai, Wenjie Zhang, Xinquan Jiang
The cellular internalization of rod-like nanoparticles (NPs) is investigated in a combined experimental and simulation study. These rod-like nanoparticles with smooth, abacus-like (i.e., beads-on-wires), and helical surface patterns are prepared by the cooperative self-assembly of poly(γ-benzyl-l-glutamate)-block-poly(ethylene glycol) (PBLG-b-PEG) block copolymers and PBLG homopolymers. All three types of NPs can be internalized via endocytosis. Helical NPs exhibit the best endocytic efficacy, followed by smooth NPs and abacus-like NPs...
May 2, 2017: Small
Xiyuan Chen, Wei Wang
Vibration is an important error source in fiber-optic gyroscopes (FOGs), and the extraction and compensation of vibration signals are important ways to eliminate the error and improve the accuracy of FOG. To decompose the vibration signal better, a new algorithm based on empirical mode decomposition (EMD) with masking signal is proposed in this paper. The masking signal is a kind of sinusoidal signal, and the frequency and amplitude of the masking signal are selected using improved particle swarm optimization...
May 1, 2017: Applied Optics
Reza Abbasi-Kesbi, Hamidreza Memarzadeh-Tehran, M Jamal Deen
The design and implementation of a wearable system to estimate the human reaction time (HRT) to visual stimulus based on two identical wireless motion sensors are described. Each sensor incorporates a motion sensor (gyroscope), a processor and a transceiver operating at the industrial, scientific and medical frequency of 2.45 GHz. Relevant tests to estimate the HRT are performed in two different scenarios including simple and recognition tests for 90 pairs of measurements. The obtained results are compared with a computer-based system to determine the accuracy of the proposed system...
April 2017: Healthcare Technology Letters
Yongjian Zhang, Bin Zhou, Mingliang Song, Bo Hou, Haifeng Xing, Rong Zhang
Gyro north finders have been widely used in maneuvering weapon orientation, oil drilling and other areas. This paper proposes a novel Micro-Electro-Mechanical System (MEMS) gyroscope north finder based on the rotation modulation (RM) technique. Two rotation modulation modes (static and dynamic modulation) are applied. Compared to the traditional gyro north finders, only one single MEMS gyroscope and one MEMS accelerometer are needed, reducing the total cost since high-precision gyroscopes and accelerometers are the most expensive components in gyro north finders...
April 28, 2017: Sensors
Minh H Pham, Morad Elshehabi, Linda Haertner, Tanja Heger, Markus A Hobert, Gert S Faber, Dina Salkovic, Joaquim J Ferreira, Daniela Berg, Álvaro Sanchez-Ferro, Jaap H van Dieën, Walter Maetzler
INTRODUCTION: Aging and age-associated disorders such as Parkinson's disease (PD) are often associated with turning difficulties, which can lead to falls and fractures. Valid assessment of turning and turning deficits specifically in non-standardized environments may foster specific treatment and prevention of consequences. METHODS: Relative orientation, obtained from 3D-accelerometer and 3D-gyroscope data of a sensor worn at the lower back, was used to develop an algorithm for turning detection and qualitative analysis in PD patients and controls in non-standardized environments...
2017: Frontiers in Neurology
James Beyea, Chris A McGibbon, Andrew Sexton, Jeremy Noble, Colleen O'Connell
BACKGROUND: The timed-up-and-go test (TUG) is one of the most commonly used tests of physical function in clinical practice and for research outcomes. Inertial sensors have been used to parse the TUG test into its composite phases (rising, walking, turning, etc.), but have not validated this approach against an optoelectronic gold-standard, and to our knowledge no studies have published the minimal detectable change of these measurements. METHODS: Eleven adults performed the TUG three times each under normal and slow walking conditions, and 3 m and 5 m walking distances, in a 12-camera motion analysis laboratory...
April 23, 2017: Sensors
Taeho Hur, Jaehun Bang, Dohyeong Kim, Oresti Banos, Sungyoung Lee
Activity recognition through smartphones has been proposed for a variety of applications. The orientation of the smartphone has a significant effect on the recognition accuracy; thus, researchers generally propose using features invariant to orientation or displacement to achieve this goal. However, those features reduce the capability of the recognition system to differentiate among some specific commuting activities (e.g., bus and subway) that normally involve similar postures. In this work, we recognize those activities by analyzing the vibrations of the vehicle in which the user is traveling...
April 23, 2017: Sensors
Ludovic Seifert, Romain Cordier, Dominic Orth, Yoan Courtine, James L Croft
This study examined the role of route previewing strategies on climbing fluency and on exploratory movements of the limbs, in order to understand whether previewing helps people to perceive and to realize affordances. Eight inexperienced and ten experienced climbers previewed a 10 m high route of 5b difficulty on French scale, then climbed it with a top-rope as fluently as possible. Gaze behavior was collected from an eye tracking system during the preview and allowed us to determine the number of times they scanned the route, and which of four route previewing strategies (fragmentary, ascending, zigzagging, and sequence-of-blocks) they used...
2017: PloS One
Anton Umek, Yuan Zhang, Sašo Tomažič, Anton Kos
Wearable devices and smart sport equipment are being increasingly used in amateur and professional sports. Smart sport equipment employs various sensors for detecting its state and actions. The correct choice of the most appropriate sensor(s) is of paramount importance for efficient and successful operation of sport equipment. When integrated into the sport equipment, ideal sensors are unobstructive, and do not change the functionality of the equipment. The article focuses on experiments for identification and selection of sensors that are suitable for the integration into a golf club with the final goal of their use in real time biofeedback applications...
April 21, 2017: Sensors
Zhiguo Wang, Xiang Peng, Hui Luo, Hong Guo
The nuclear spin precesses continually when a positive feedback nuclear magnetic resonance field is applied. The characteristics of this behaviour depend not only on the parameters of the spin ensemble but also on the type and parameters of the feedback loop. We theoretically analysed two types of feedback loops which use direct feedback and phase-lock feedback, respectively. We also compared the oscillating frequency of the spin oscillators using rotating and linear magnetic fields, respectively. Some interesting results on the frequency and start-time of the oscillator were found...
May 2017: Journal of Magnetic Resonance
Jacob Chamoun, Michel J F Digonnet
A laser-driven fiber optic gyroscope (FOG) is demonstrated with an angular random walk noise of 5.5×10<sup>-4</sup>  deg/√h, a drift of 6.8×10<sup>-3</sup>  deg/h, and an inferred scale-factor stability of 0.15 ppm, making it, to the best of our knowledge, the first laser-driven FOG to satisfy the performance requirements for inertial navigation of commercial aircraft. This is achieved using Gaussian white noise phase modulation to broaden the linewidth of the source laser and to strongly suppress the narrow-linewidth optical carrier...
April 15, 2017: Optics Letters
J Ren, H Hodaei, G Harari, A U Hassan, W Chow, M Soltani, D Christodoulides, M Khajavikhan
We propose a new scheme for ultrasensitive laser gyroscopes that utilizes the physics of exceptional points. By exploiting the properties of such non-Hermitian degeneracies, we show that the rotation-induced frequency splitting becomes proportional to the square root of the gyration speed (Ω), thus enhancing the sensitivity to low angular rotations by orders of magnitudes. In addition, at its maximum sensitivity limit, the measurable spectral splitting is independent of the radius of the rings involved. This Letter paves the way toward a new class of ultrasensitive miniature ring laser gyroscopes on chip...
April 15, 2017: Optics Letters
Estefania Munoz Diaz, Fabian de Ponte Müller, Juan Jesús García Domínguez
An accurate orientation is crucial to a satisfactory position in pedestrian navigation. The orientation estimation, however, is greatly affected by errors like the biases of gyroscopes. In order to minimize the error in the orientation, the biases of gyroscopes must be estimated and subtracted. In the state of the art it has been proposed, but not proved, that the estimation of the biases can be accomplished using magnetic field measurements. The objective of this work is to evaluate the effectiveness of using magnetic field measurements to estimate the biases of medium-cost micro-electromechanical sensors (MEMS) gyroscopes...
April 11, 2017: Sensors
Xiong Pan, Pengcheng Liu, Shaobo Zhang, Jing Jin, Ningfang Song
A novel digital compensation scheme is demonstrated to control the gain of the modulation chain and suppress the influence of quantization error on bias. The error produced by the quantization multiplied by the scaling factor is theoretically analyzed. Simulations indicate that the quantization error varies with the input angular velocity and temperature, which is verified by experiments. By switching the integration and compression operations in the modulation chain, this quantization error is reduced, while automatic reset of the digital phase ramp register is achieved...
April 10, 2017: Sensors
Olli Lahdenoja, Tero Hurnanen, Zuhair Iftikhar, Sami Nieminen, Timo Knuutila, Antti Saraste, Tuomas Kiviniemi, Tuija Vasankari, Juhani Airaksinen, Mikko Pankaala, Tero Koivisto
We present a smartphone-only solution for the detection of Atrial Fibrillation (AFib), which utilizes the builtin accelerometer and gyroscope sensors (Inertial Measurement Unit, IMU) in the detection. Depending on the patient's situation, it is possible to use the developed smartphone application either regularly or occasionally for making a measurement of the subject. The smartphone is placed on the chest of the patient who is adviced to lay down and perform a non-invasive recording, while no external sensors are needed...
April 5, 2017: IEEE Journal of Biomedical and Health Informatics
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