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https://www.readbyqxmd.com/read/28728010/advances-in-point-of-care-technologies-for-molecular-diagnostics
#1
REVIEW
Mohammad Zarei
Advances in miniaturization, nanotechnology, and microfluidics, along with developments in cloud-connected point-of-care (POC) diagnostics technologies are pushing the frontiers of POC devices toward low-cost, user-friendly, and enhanced sensitivity molecular-level diagnostics. The combination of various bio-sensing platforms within smartphone-integrated electronic readers provides accurate on-site and on-time diagnostics based on various types of chemical and biological targets. Further, 3D printing technology shows a huge potential toward fabrication and improving the performance of POC devices...
July 11, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28727557/integrating-flexible-sensor-and-virtual-self-organizing-dc-grid-model-with-cloud-computing-for-blood-leakage-detection-during-hemodialysis
#2
Ping-Tzan Huang, Tai-Lang Jong, Chien-Ming Li, Wei-Ling Chen, Chia-Hung Lin
Blood leakage and blood loss are serious complications during hemodialysis. From the hemodialysis survey reports, these life-threatening events occur to attract nephrology nurses and patients themselves. When the venous needle and blood line are disconnected, it takes only a few minutes for an adult patient to lose over 40% of his / her blood, which is a sufficient amount of blood loss to cause the patient to die. Therefore, we propose integrating a flexible sensor and self-organizing algorithm to design a cloud computing-based warning device for blood leakage detection...
July 18, 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28726745/dual-source-linear-energy-prediction-line-p-model-in-the-context-of-wsns
#3
Faisal Ahmed, Gert Tamberg, Yannick Le Moullec, Paul Annus
Energy harvesting technologies such as miniature power solar panels and micro wind turbines are increasingly used to help power wireless sensor network nodes. However, a major drawback of energy harvesting is its varying and intermittent characteristic, which can negatively affect the quality of service. This calls for careful design and operation of the nodes, possibly by means of, e.g., dynamic duty cycling and/or dynamic frequency and voltage scaling. In this context, various energy prediction models have been proposed in the literature; however, they are typically compute-intensive or only suitable for a single type of energy source...
July 20, 2017: Sensors
https://www.readbyqxmd.com/read/28726738/scheduling-for-emergency-tasks-in-industrial-wireless-sensor-networks
#4
Changqing Xia, Xi Jin, Linghe Kong, Peng Zeng
Wireless sensor networks (WSNs) are widely applied in industrial manufacturing systems. By means of centralized control, the real-time requirement and reliability can be provided by WSNs in industrial production. Furthermore, many approaches reserve resources for situations in which the controller cannot perform centralized resource allocation. The controller assigns these resources as it becomes aware of when and where accidents have occurred. However, the reserved resources are limited, and such incidents are low-probability events...
July 20, 2017: Sensors
https://www.readbyqxmd.com/read/28724994/high-resolution-on-chip-rf-photonic-signal-processor-using-brillouin-gain-shaping-and-rf-interference
#5
Amol Choudhary, Yang Liu, Blair Morrison, Khu Vu, Duk-Yong Choi, Pan Ma, Stephen Madden, David Marpaung, Benjamin J Eggleton
Integrated microwave photonics has strongly emerged as a next-generation technology to address limitations of conventional RF electronics for wireless communications. High-resolution RF signal processing still remains a challenge due to limitations in technology that offer sub-GHz spectral resolution, in particular at high carrier frequencies. In this paper, we present an on-chip high-resolution RF signal processor, capable of providing high-suppression spectral filtering, large phase shifts and ns-scale time delays...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724187/nasogastric-tube-as-abdominal-pressure-sensor-in-urodynamics-proof-of-concept-of-a-novel-approach
#6
Sundaramoorthy VijayGanapathy, Vilvapathy Senguttuvan Karthikeyan, Ashwin Mallya, Ali Poonawala, Ramaiah Keshavamurthy
AIMS: The standard sensor for abdominal pressure (Pabd) measurement in urodynamics (UD) is a rectal sensor. In patients where the rectum is not available due to prior surgery or when external anal sphincter (EAS) tone is poor, rectal sensor may slip, making Pabd recording unreliable. Vaginal Pabd measurement and wireless vaginal sensors have been tried. We present our preliminary series of a novel nasogastric tube (NG) sensor for Pabd measurement. METHODS: We identified patients undergoing UD with a NG Pabd sensor from a prospectively maintained UD database of a tertiary care urological center between July 2013 and December 2016...
July 19, 2017: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/28723210/bipolar-electrodes-with-100-current-efficiency-for-sensors
#7
Xiaowei Zhang, Qingfeng Zhai, Huanhuan Xing, Jing Li, Erkang Wang
A bipolar electrode (BPE) is an electron conductor that is embedded in the electrolyte solution without the direct connection with the external power source (driving electrode). When the sufficient voltage was provided, the two poles of BPE promote different oxidation and reduction reactions. During the past few years, BPEs with wireless feature and easy integration showed great promise in the various fields including asymmetric modification/synthesis, motion control, targets enrichment/separation, and chemical sensing/biosensing combined with the quantitative relationship between two poles of BPE...
March 24, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723205/ultrafast-paper-thermometers-based-on-a-green-sensing-ink
#8
Xinglei Tao, Hanyu Jia, Yonglin He, Shenglong Liao, Yapei Wang
With the use of an ionic liquid as the ultrathermosensitive fluid, a paper thermometer is successfully developed with intrinsic ability of ultrafast response and high stability upon temperature change. The fluidic nature allows the ionic liquid to be easily deposited on paper by pen writing or inkjet printing, affording great promise for large-scale fabrication of low-cost paper sensors. Owing to the advantages of nonvolatilization, excellent continuity and deformability, the thermosensitive ink trapped within the cellulose fibers of paper matrix has no leakage or evaporation at open states, ensuring the excellent stability and repeatability of thermal sensing against arbitrary bending and folding operation...
March 24, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723187/wearable-flexible-and-stretchable-glove-biosensor-for-on-site-detection-of-organophosphorus-chemical-threats
#9
Rupesh K Mishra, Lee J Hubble, Aida Martín, Rajan Kumar, Abbas Barfidokht, Jayoung Kim, Mustafa M Musameh, Ilias L Kyratzis, Joseph Wang
A flexible glove-based electrochemical biosensor with highly stretchable printed electrode system has been developed as a wearable point-of-use screening tool for defense and food security applications. This disposable-mechanically robust "lab-on-a-glove" integrates a stretchable printable enzyme-based biosensing system and active surface for swipe sampling on different fingers, and is coupled with a compact electronic interface for electrochemical detection and real-time wireless data transmission to a smartphone device...
April 28, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723117/versatile-barometer-biosensor-based-on-au-pt-core-shell-nanoparticle-probe
#10
Qiangqiang Fu, Ze Wu, Dan Du, Chengzhou Zhu, Yuehe Lin, Yong Tang
There is a high global demand for sensitive, portable, user-friendly, and cost-effective biosensors. In this work, we introduce a barometer-based biosensor for the detection of a broad range of targets. The device is operated by measuring the pressure change produced by oxygen (O2) generation in a limited chamber using a portable barometer. The design employs core-shell Au@Pt nanoparticles (Au@PtNPs) as the bioassay probe to catalyze the decomposition of H2O2 and the release of O2. As a proof of concept, we developed barometer-based immunosensors to detect carcinoembryonic antigen (CEA) and ractopamine (Rac)...
June 23, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28722314/prospective-motion-correction-using-coil-mounted-cameras-cross-calibration-considerations
#11
Julian Maclaren, Murat Aksoy, Melvyn B Ooi, Benjamin Zahneisen, Roland Bammer
PURPOSE: Optical prospective motion correction substantially reduces sensitivity to motion in neuroimaging of human subjects. However, a major barrier to clinical deployment has been the time-consuming cross-calibration between the camera and MRI scanner reference frames. This work addresses this challenge. METHODS: A single camera was mounted onto the head coil for tracking head motion. Two new methods were developed: (1) a rapid calibration method for camera-to-scanner cross-calibration using a custom-made tool incorporating wireless active markers, and (2) a calibration adjustment method to compensate for table motion between scans...
July 19, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28721726/3d-printed-earable-smart-devices-for-real-time-detection-of-core-body-temperature
#12
Hiroki Ota, Minghan Chao, Yuji Gao, Eric Wu, Li-Chia Tai, Kevin Chen, Yasutomo Matsuoka, Kosuke Iwai, Hossain M Fahad, Wei Gao, Hnin Yin Yin Nyein, Liwei Lin, Ali Javey
Real-time detection of basic physiological parameters such as blood pressure and heart rate is an important target in wearable smart devices for healthcare. Among these, the core body temperature is one of the most important basic medical indicators of fever, insomnia, fatigue, metabolic functionality, and depression. However, traditional wearable temperature sensors are based upon the measurement of skin temperature, which can vary dramatically from the true core body temperature. Here, we demonstrate a three-dimensional (3D) printed wearable "earable" smart device that is designed to be worn on the ear to track core body temperature from the tympanic membrane (i...
July 19, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28719616/analytical-network-process-based-optimum-cluster-head-selection-in-wireless-sensor-network
#13
Haleem Farman, Huma Javed, Bilal Jan, Jamil Ahmad, Shaukat Ali, Falak Naz Khalil, Murad Khan
Wireless Sensor Networks (WSNs) are becoming ubiquitous in everyday life due to their applications in weather forecasting, surveillance, implantable sensors for health monitoring and other plethora of applications. WSN is equipped with hundreds and thousands of small sensor nodes. As the size of a sensor node decreases, critical issues such as limited energy, computation time and limited memory become even more highlighted. In such a case, network lifetime mainly depends on efficient use of available resources...
2017: PloS One
https://www.readbyqxmd.com/read/28717363/development-of-an-autonomous-endoscopically-implantable-submucosal-microdevice-capable-of-neurostimulation-in-the-gastrointestinal-tract
#14
J Hajer, M Novák
Gastric dysmotility can be a sign of common diseases such as longstanding diabetes mellitus. It is known that the application of high-frequency low-energetic stimulation can help to effectively moderate and alleviate the symptoms of gastric dysmotility. The goal of our research was the development of a miniature, endoscopically implantable device to a submucosal pocket. The implantable device is a fully customized electronics package which was specifically designed for the purpose of experiments in the submucosa...
2017: Gastroenterology Research and Practice
https://www.readbyqxmd.com/read/28715338/closed-loop-neurostimulators-a-survey-and-a-seizure-predicting-design-example-for-intractable-epilepsy-treatment
#15
Hossein Kassiri, Sana Tonekaboni, M Tariqus Salam, Nima Soltani, Karim Abdelhalim, Jose Luis Perez Velazquez, Roman Genov
First, existing commercially available open-loop and closed-loop implantable neurostimulators are reviewed and compared in terms of their targeted application, physical size, system-level features, and performance as a medical device. Next, signal processing algorithms as the primary strength point of the closed-loop neurostimulators are reviewed, and various design and implementation requirements and trade-offs are discussed in details along with quantitative examples. The review results in a set of guidelines for algorithm selection and evaluation...
July 17, 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28714936/extending-wireless-rechargeable-sensor-network-life-without-full-knowledge
#16
Najeeb W Najeeb, Carrick Detweiler
When extending the life of Wireless Rechargeable Sensor Networks (WRSN), one challenge is charging networks as they grow larger. Overcoming this limitation will render a WRSN more practical and highly adaptable to growth in the real world. Most charging algorithms require a priori full knowledge of sensor nodes' power levels in order to determine the nodes that require charging. In this work, we present a probabilistic algorithm that extends the life of scalable WRSN without a priori power knowledge and without full network exploration...
July 17, 2017: Sensors
https://www.readbyqxmd.com/read/28714927/development-and-application-of-a-structural-health-monitoring-system-based-on-wireless-smart-aggregates
#17
Shi Yan, Haoyan Ma, Peng Li, Gangbing Song, Jianxin Wu
Structural health monitoring (SHM) systems can improve the safety and reliability of structures, reduce maintenance costs, and extend service life. Research on concrete SHMs using piezoelectric-based smart aggregates have reached great achievements. However, the newly developed techniques have not been widely applied in practical engineering, largely due to the wiring problems associated with large-scale structural health monitoring. The cumbersome wiring requires much material and labor work, and more importantly, the associated maintenance work is also very heavy...
July 17, 2017: Sensors
https://www.readbyqxmd.com/read/28714898/frame-transmission-efficiency-based-cross-layer-congestion-notification-scheme-in-wireless-ad-hoc-networks
#18
Huaguang He, Taoshen Li, Luting Feng, Jin Ye
Different from the traditional wired network, the fundamental cause of transmission congestion in wireless ad hoc networks is medium contention. How to utilize the congestion state from the MAC (Media Access Control) layer to adjust the transmission rate is core work for transport protocol design. However, recent works have shown that the existing cross-layer congestion detection solutions are too complex to be deployed or not able to characterize the congestion accurately. We first propose a new congestion metric called frame transmission efficiency (i...
July 15, 2017: Sensors
https://www.readbyqxmd.com/read/28714896/localization-with-graph-diffusion-property
#19
Pengpeng Chen, Yuqing Yin, Shouwan Gao, Qiang Niu, Jun Gu
Node localization is an essential issue in wireless sensor networks (WSNs). Many range-free localization methods have been proposed to satisfy the requirement of low-system cost. However, some range-free methods only depend on network connectivity, and others only utilize the proximity information attached in neighborhood ordering. To employ the strength of the above two aspects, this paper introduces a new metric system called Combined and Weighted Diffusion Distance (CWDD). CWDD is designed to obtain the relative distance among nodes based on both graph diffusion property and neighbor information...
July 15, 2017: Sensors
https://www.readbyqxmd.com/read/28714239/self-powered-real-time-arterial-pulse-monitoring-using-ultrathin-epidermal-piezoelectric-sensors
#20
Dae Yong Park, Daniel J Joe, Dong Hyun Kim, Hyewon Park, Jae Hyun Han, Chang Kyu Jeong, Hyelim Park, Jung Gyu Park, Boyoung Joung, Keon Jae Lee
Continuous monitoring of an arterial pulse using a pressure sensor attached on the epidermis is an important technology for detecting the early onset of cardiovascular disease and assessing personal health status. Conventional pulse sensors have the capability of detecting human biosignals, but have significant drawbacks of power consumption issues that limit sustainable operation of wearable medical devices. Here, a self-powered piezoelectric pulse sensor is demonstrated to enable in vivo measurement of radial/carotid pulse signals in near-surface arteries...
July 17, 2017: Advanced Materials
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