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https://www.readbyqxmd.com/read/29222422/reconfigurable-yagi-uda-antenna-based-on-a-silicon-reflector-with-a-solid-state-plasma
#1
Da-Jin Kim, Jang-Soon Park, Cheol Ho Kim, Jae Hur, Choong-Ki Kim, Young-Kyun Cho, Jun-Bong Ko, Bonghyuk Park, Dongho Kim, Yang-Kyu Choi
This paper describes the fabrication and characterization of a reconfigurable Yagi-Uda antenna based on a silicon reflector with a solid-state plasma. The silicon reflector, composed of serially connected p-i-n diodes, forms a highly dense solid-state plasma by injecting electrons and holes into the intrinsic region. When this plasma silicon reflector is turned on, the front-realized gain of the antenna increases by more than 2 dBi beyond 5.3 GHz. To achieve the large gain increment, the structure of the antenna is carefully designed with the aid of semiconductor device simulation and antenna simulation...
December 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29221044/side-lobe-level-reduction-in-bio-inspired-optical-phased-array-antennas
#2
Julián L Pita, Ivan Aldaya, Octávio J S Santana, Luís E E de Araujo, Paulo Dainese, Lucas H Gabrielli
Phased arrays are expected to play a critical role in visible and infrared wireless systems. Their improved performance compared to single element antennas finds uses in communications, imaging, and sensing. However, fabrication of photonic antennas and their feeding network require long element separation, leading to the appearance of secondary radiation lobes and, consequently, crosstalk and interference. In this work, we experimentally show that by arranging the elements according to the Fermat's spiral, the side lobe level (SLL) can be reduced...
November 27, 2017: Optics Express
https://www.readbyqxmd.com/read/29221021/solution-for-error-propagation-in-a-noma-based-vlc-network-symmetric-superposition-coding
#3
Haoyue Li, Zhitong Huang, Yu Xiao, Shuang Zhan, Yuefeng Ji
Non-orthogonal multiple access (NOMA) has recently attracted significant attention as a promising multiple access scheme for the 5th generation (5G) wireless communication due to its superior spectral efficiency, which has also been studied and shown to achieve a superior performance in visible light communication (VLC) networks. However, the error propagation (EP) problem due to successive interference cancellation (SIC) decoding has not yet been resolved, which degrades the system BER performance and causes user unfairness...
November 27, 2017: Optics Express
https://www.readbyqxmd.com/read/29219118/adaptive-quantization-of-local-field-potentials-for-wireless-implants-in-freely-moving-animals-an-open-source-neural-recording-device
#4
Dominique Martinez, Maxime Clement, Belkacem Messaoudi, Damien Gervasoni, Philippe Litaudon, Nathalie Buonviso
OBJECTIVE: Modern neuroscience research asks for electrophysiological recording of local field potentials (LFPs) in moving animals. Wireless transmission has the advantage of removing the wires between the animal and the recording equipment but is hampered by the large amount of data to be sent at a relatively high rate. APPROACH: To reduce transmission bandwidth, we propose an encoder/decoder scheme based on adaptive non-uniform quantization. Our algorithm uses the current transmitted codeword to adapt the quantization intervals to changing statistics in LFP signals...
December 8, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29217253/update-on-cardiovascular-implantable-electronic-devices-for-anesthesiologists
#5
REVIEW
Brett Cronin, Michael K Essandoh
With the advent of "wireless" endocardial pacing, the subcutaneous implantable cardioverter defibrillator, and leadless pacemakers comes an added layer of complexity to the perioperative management of cardiovascular implantable electronic devices (CIED). Since no formal recommendations currently exist for these new CIED technologies, preoperative identification of these devices, understanding their functionality, and developing an individualized perioperative management plan are imperative for the anesthesiologist...
September 7, 2017: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/29215787/miniaturized-battery-free-optofluidic-systems-with-potential-for-wireless-pharmacology-and-optogenetics
#6
Kyung Nim Noh, Sung Il Park, Raza Qazi, Zhanan Zou, Aaron D Mickle, Jose G Grajales-Reyes, Kyung-In Jang, Robert W Gereau, Jianliang Xiao, John A Rogers, Jae-Woong Jeong
Combination of optogenetics and pharmacology represents a unique approach to dissect neural circuitry with high specificity and versatility. However, conventional tools available to perform these experiments, such as optical fibers and metal cannula, are limited due to their tethered operation and lack of biomechanical compatibility. To address these issues, a miniaturized, battery-free, soft optofluidic system that can provide wireless drug delivery and optical stimulation for spatiotemporal control of the targeted neural circuit in freely behaving animals is reported...
December 7, 2017: Small
https://www.readbyqxmd.com/read/29215115/perovskite-photodetectors-with-both-visible-infrared-dual-mode-response-and-super-narrowband-characteristics-towards-photo-communication-encryption-application
#7
Ye Wu, Xiaoming Li, Yi Wei, Yu Gu, Haibo Zeng
Photo-communication has attracted great attention because of the rapid development of wireless information transmission technology. However, it is still a great challenge in cryptography communications, where it is greatly weakened by the openness of the light channels. Here, visible-infrared dual-mode narrowband perovskite photodetectors were fabricated and a new photo-communication encryption technique was proposed. For the first time, highly narrowband and two-photon absorption (TPA) resultant photoresponses within a single photodetector are demonstrated...
December 7, 2017: Nanoscale
https://www.readbyqxmd.com/read/29214598/evaluation-of-a-wireless-portable-wearable-multi-parameter-vital-signs-monitor-in-hospitalized-neurological-and-neurosurgical-patients
#8
Robert S Weller, Kristina L Foard, Timothy N Harwood
Unrecognized changes in patients' vital signs can result in preventable deaths in hospitalized patients. Few publications or studies instituting routine patient monitoring have described implementation and the setting of alarm parameters for vital signs. We wanted to determine if continuous multi-parameter patient monitoring can be accomplished with an alarm rate that is acceptable to hospital floor nurses and to compare the rate of patient deterioration events to those observed with routine vital sign monitoring...
December 6, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/29214438/interactions-between-top-down-and-bottom-up-attention-in-barn-owls-tyto-alba
#9
Tidhar Lev-Ari, Yoram Gutfreund
Selective attention, the prioritization of behaviorally relevant stimuli for behavioral control, is commonly divided into two processes: bottom-up, stimulus-driven selection and top-down, task-driven selection. Here, we tested two barn owls in a visual search task that examines attentional capture of the top-down task by bottom-up mechanisms. We trained barn owls to search for a vertical Gabor patch embedded in a circular array of differently oriented Gabor distractors (top-down guided search). To track the point of gaze, a lightweight wireless video camera was mounted on the owl's head...
December 6, 2017: Animal Cognition
https://www.readbyqxmd.com/read/29214149/measurements-of-radiofrequency-radiation-with-a-body-borne-exposimeter-in-swedish-schools-with-wi-fi
#10
Lena K Hedendahl, Michael Carlberg, Tarmo Koppel, Lennart Hardell
Introduction: Wireless access to the Internet is now commonly used in schools. Many schools give each student their own laptop and utilize the laptops and wireless fidelity (Wi-Fi) connection for educational purposes. Most children also bring their own mobile phones to school. Since children are obliged by law to attend school, a safe environment is important. Lately, it has been discussed if radiofrequency (RF) radiation can have long-term adverse effects on children's health. Method: This study conducted exposimetric measurements in schools to assess RF emissions in the classroom by measuring the teachers' RF exposure in order to approximate the children's exposure...
2017: Frontiers in Public Health
https://www.readbyqxmd.com/read/29210098/regional-gastrointestinal-contractility-parameters-using-the-wireless-motility-capsule-inter-observer-reproducibility-and-influence-of-age-gender-and-study-country
#11
A D Farmer, A-M L Wegeberg, B Brock, A R Hobson, S D Mohammed, S M Scott, C E Bruckner-Holt, J R Semler, W L Hasler, P M Hellström, A M Drewes, C Brock
BACKGROUND: The wireless motility capsule concurrently measures temperature, pH and pressure as it traverses the gastrointestinal tract. AIMS: To describe normative values for motility/contractility parameters across age, gender and testing centres. METHODS: Healthy participants underwent a standardised wireless motility capsule assessment following an overnight fast and consumption of a meal of known nutritional content. Traces were divided into regions of interest and analysed using 2 software packages (MotiliGI and GIMS Data Viewer)...
December 6, 2017: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/29207541/node-depth-adjustment-based-target-tracking-in-uwsns-using-improved-harmony-search
#12
Meiqin Liu, Duo Zhang, Senlin Zhang, Qunfei Zhang
Underwater wireless sensor networks (UWSNs) can provide a promising solution to underwater target tracking. Due to the limited computation and bandwidth resources, only a small part of nodes are selected to track the target at each interval. How to improve tracking accuracy with a small number of nodes is a key problem. In recent years, a node depth adjustment system has been developed and applied to issues of network deployment and routing protocol. As far as we know, all existing tracking schemes keep underwater nodes static or moving with water flow, and node depth adjustment has not been utilized for underwater target tracking yet...
December 4, 2017: Sensors
https://www.readbyqxmd.com/read/29204376/mobile-cardiac-health-care-monitoring-and-notification-with-real-time-tachycardia-and-bradycardia-arrhythmia-detection
#13
Mina Golzar, Faranak Fotouhi-Ghazvini, Hossein Rabbani, Fahimeh Sadat Zakeri
Background: The increasing trend of heart disease has turned the attention of researchers toward the use of portable connected technologies. The necessity of continuous special care for cardiovascular patients is an inevitable fact. Methods: In this research, a new wireless electrocardiographic (ECG) signal-monitoring system based on smartphone is presented. This system has two main sections. The first section consists of a sensor which receives ECG signals via an amplifier, then filters and digitizes the signal, and prepares it to be transmitted...
October 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29203949/simultaneous-wireless-power-transfer-and-data-communication-using-synchronous-pulse-controlled-load-modulation
#14
Shitong Mao, Hao Wang, Chunbo Zhu, Zhi-Hong Mao, Mingui Sun
Wireless Power Transfer (WPT) and wireless data communication are both important problems of research with various applications, especially in medicine. However, these two problems are usually studied separately. In this work, we present a joint study of both problems. Most medical electronic devices, such as smart implants, must have both a power supply to allow continuous operation and a communication link to pass information. Traditionally, separate wireless channels for power transfer and communication are utilized, which complicate the system structure, increase power consumption and make device miniaturization difficult...
October 2017: Measurement: Journal of the International Measurement Confederation
https://www.readbyqxmd.com/read/29203945/is-there-an-application-for-wireless-capsule-endoscopy-in-horses
#15
Julia B Montgomery, Jose L Bracamonte, Mohammad Wajih Alam, Alimul H Khan, Shahed K Mohammed, Khan A Wahid
This pilot study assessed wireless capsule endoscopy in horses. Image transmission was achieved with good image quality. Time to exit the stomach was variable and identified as one limitation, together with gaps in image transmission, capsule tumbling, and inability to accurately locate the capsule. Findings demonstrate usefulness and current limitations.
December 2017: Canadian Veterinary Journal. la Revue Vétérinaire Canadienne
https://www.readbyqxmd.com/read/29203788/highly-sensitive-thin-film-thz-detector-based-on-edge-metal-semiconductor-metal-junction
#16
Youngeun Jeon, Sungchul Jung, Hanbyul Jin, Kyuhyung Mo, Kyung Rok Kim, Wook-Ki Park, Seong-Tae Han, Kibog Park
Terahertz (THz) detectors have been extensively studied for various applications such as security, wireless communication, and medical imaging. In case of metal-insulator-metal (MIM) tunnel junction THz detector, a small junction area is desirable because the detector response time can be shortened by reducing it. An edge metal-semiconductor-metal (EMSM) junction has been developed with a small junction area controlled precisely by the thicknesses of metal and semiconductor films. The voltage response of the EMSM THz detector shows the clear dependence on the polarization angle of incident THz wave and the responsivity is found to be very high (~2,169 V/W) at 0...
December 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29202131/multifunctional-system-for-observing-measuring-and-analyzing-stimulation-evoked-neurochemical-signaling
#17
Christopher J Kimble, Joshua B Boesche, Diane R Eaker, Kenneth R Kressin, James K Trevathan, Seungleal Paek, Anders J Asp, Malcolm B McIntosh, J Luis Lujan
The ability to measure neurotransmitter activity using implanted electrochemical sensors offers researchers a potent technique for analyzing neural activity across specific neural circuitry. We have developed a wirelessly controlled device, WINCS Harmoni, to observe and measure neurotransmitter dynamics at up to four separate sensors, with high temporal and spatial resolution. WINCS Harmoni also incorporates a versatile neurostimulator that can be synchronized with electrochemical recording. The WINCS Harmoni platform is thus optimally suited for probing the neurochemical effects of neurostimulation, and may in turn enable the development of personalized therapies for multiple brain disorders...
May 2017: IEEE International Symposium on Medical Measurements and Applications: Proceedings
https://www.readbyqxmd.com/read/29201608/toward-bioelectronic-medicine-neuromodulation-of-small-peripheral-nerves-using-flexible-neural-clip
#18
Sanghoon Lee, Wendy Yen Xian Peh, Jiahui Wang, Fengyuan Yang, John S Ho, Nitish V Thakor, Shih-Cheng Yen, Chengkuo Lee
Neural modulation technology and the capability to affect organ function have spawned the new field of bioelectronic medicine. Therapeutic interventions depend on wireless bioelectronic neural interfaces that can conformally and easily attach to small (few hundred micrometers) nerves located deep in the body without neural damage. Besides size, factors like flexibility and compliance to attach and adapt to visceral nerves associated moving organs are of paramount importance and have not been previously addressed...
November 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/29201042/adaptive-compressive-sensing-of-images-using-spatial-entropy
#19
Ran Li, Xiaomeng Duan, Xiaoli Guo, Wei He, Yongfeng Lv
Compressive Sensing (CS) realizes a low-complex image encoding architecture, which is suitable for resource-constrained wireless sensor networks. However, due to the nonstationary statistics of images, images reconstructed by the CS-based codec have many blocking artifacts and blurs. To overcome these negative effects, we propose an Adaptive Block Compressive Sensing (ABCS) system based on spatial entropy. Spatial entropy measures the amount of information, which is used to allocate measuring resources to various regions...
2017: Computational Intelligence and Neuroscience
https://www.readbyqxmd.com/read/29199161/indications-of-24-h-esophageal-ph-monitoring-capsule-ph-monitoring-combined-ph-monitoring-with-multichannel-impedance-esophageal-manometry-radiology-and-scintigraphy-in-gastroesophageal-reflux-disease
#20
Rukiye Vardar, Muharrem Keskin
Ambulatory esophageal pH monitoring is an essential method in patients exhibiting signs of non-erosive reflux disease (NERD) to make an objective diagnosis. Intra-esophageal pH monitoring is important in patients who are non-responsive to medications and in those with extraesophageal symptoms, particularly in NERD, before surgical interventions. With the help of the wireless capsule pH monitoring, measurements can be made under more physiological conditions as well as longer recordings can be performed because the investigation can be better tolerated by patients...
December 2017: Turkish Journal of Gastroenterology: the Official Journal of Turkish Society of Gastroenterology
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