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Sensors, Vol. 23, Pages 507: An Improved TDOA Method for Land-Based Long-Range HF Skywave Source Geolocation and Experimental Results
ei Zhai The real-time information of the unknown ionospheric environments is difficult to obtain, plaguing the timely and accurate geolocation of high frequency (HF) sources. In this paper, we propose an improved HF skywave source geolocation method based on the time-difference-of-arrival (TDOA) with the semidefinite programming (SDP), and model HF signal propagation paths as paths with significant non-line-of-sight (NLOS) biases. With this method, no priori information about the ionosphere, especially the priori ionospheric virtual heights of reflection, is necessary while timely and accurately geolocating the HF sour...
Source: Sensors - January 2, 2023 Category: Biotechnology Authors: Chen Xu Hongtao Cai Shunzu Gao Qingwei Zhai Tags: Article Source Type: research

Sensors, Vol. 23, Pages 356: STC-NLSTMNet: An Improved Human Activity Recognition Method Using Convolutional Neural Network with NLSTM from WiFi CSI
g-Hyun Yang Human activity recognition (HAR) has emerged as a significant area of research due to its numerous possible applications, including ambient assisted living, healthcare, abnormal behaviour detection, etc. Recently, HAR using WiFi channel state information (CSI) has become a predominant and unique approach in indoor environments compared to others (i.e., sensor and vision) due to its privacy-preserving qualities, thereby eliminating the need to carry additional devices and providing flexibility of capture motions in both line-of-sight (LOS) and non-line-of-sight (NLOS) settings. Existing deep learning (DL)-ba...
Source: Sensors - December 29, 2022 Category: Biotechnology Authors: Md Shafiqul Islam Mir Kanon Ara Jannat Mohammad Nahid Hossain Woo-Su Kim Soo-Wook Lee Sung-Hyun Yang Tags: Article Source Type: research

Sensors, Vol. 23, Pages 310: Delay-Packet-Loss-Optimized Distributed Routing Using Spiking Neural Network in Delay-Tolerant Networking
ent Satellite communication is inevitable due to the Internet of Everything and the exponential increase in the usage of smart devices. Satellites have been used in many applications to make human life safe, secure, sophisticated, and more productive. The applications that benefit from satellite communication are Earth observation (EO), military missions, disaster management, and 5G/6G integration, to name a few. These applications rely on the timely and accurate delivery of space data to ground stations. However, the channels between satellites and ground stations suffer attenuation caused by uncertain weather conditi...
Source: Sensors - December 28, 2022 Category: Biotechnology Authors: Gandhimathi Velusamy Ricardo Lent Tags: Article Source Type: research

Four cases of acute comitant esotropia associated with diffuse intrinsic pontine glioma in children
CONCLUSIONS: This small series of 4 patients attending our clinic within a 12-month period supports the notion that children presenting with AACE should routinely be offered brain MRI. Not all children with DIPG-associated AACE have significant ophthalmic findings indicative of intracranial pathology. With the potential for increased incidence of AACE related to lockdowns, clinicians should be reminded of the infrequent possibility their patient has a more serious condition.PMID:36529745 | DOI:10.1080/09273972.2022.2143823 (Source: Strabismus)
Source: Strabismus - December 18, 2022 Category: Research Authors: D Osborne J Richardson-May K Bush M Evans S K West K May J Self Source Type: research

Sensors, Vol. 22, Pages 9734: Path Loss Measurement of Outdoor Wireless Channel in D-band
Wen Zhou D-band (110–170 GHz) has received much attention in recent years due to its larger bandwidth. However, analyzing the loss characteristics of the wireless channel is very complicated at the millimeter-wave (MMW) band. Research on D-band wireless channels has been focused on indoor short-distance transmissions, with few studies looking at outdoor long-distance wireless channels. In this paper, we provide the design of the D-band outdoor long-distance transmission system, propose the outdoor line-of-sight (LOS) propagation measurements, and study the outdoor D-band propagation loss characteristic...
Source: Sensors - December 12, 2022 Category: Biotechnology Authors: Chengzhen Bian Weiping Li Mingxu Wang Xinyi Wang Yi Wei Wen Zhou Tags: Article Source Type: research

Sensors, Vol. 22, Pages 9681: Multi-Beam Conformal Array Antenna Based on Highly Conductive Graphene Films for 5G Micro Base Station Applications
Na Li Recently, micro base station antennas have begun to play a more important role in 5G wireless communication, with the rapid development of modern smart medical care, the Internet of things, and portable electronic devices. Meanwhile, in response to the global commitment to long-term carbon neutrality, graphene film has received significant attention in the field of antennas due to its low carbon environmental impact and high electrical conductivity properties. In this work, a conformal array antenna based on highly conductive graphene films (CGF) is proposed for 5G millimeter-wave (MMW) applications. The propos...
Source: Sensors - December 10, 2022 Category: Biotechnology Authors: Bin Zheng Xiangyang Li Xin Rao Na Li Tags: Article Source Type: research

Hundred-meter Gb/s deep ultraviolet wireless communications using AlGaN micro-LEDs
We demonstrate the use of deep ultraviolet (DUV) micro-light-emitting diodes (LEDs) for long-distance line-of-sight optical wireless ... (Source: Optics Express)
Source: Optics Express - December 8, 2022 Category: Physics Authors: Daniel M. Maclure Cheng Chen Jonathan J. D. McKendry Enyuan Xie Jordan Hill Johannes Herrnsdorf Erdan Gu Harald Haas Martin D. Dawson Source Type: research

Dual phenotype: co-occurring Leber congenital amaurosis and familial exudative vitreoretinopathy: a case report
CONCLUSIONS: The NDP VUS likely represents a pathogenic variant given the FEVR phenotype in addition to retinal degeneration, creating a rare dual phenotype. The combination of low oxygen demand from the IQCB1-associated retinal degeneration and NDP variant may have led to a more attenuated FEVR presentation with uncertain prognosis. A molecular diagnosis informed ocular and renal surveillance, as well as the recurrence risk for future offspring.PMID:36426739 | DOI:10.1080/13816810.2022.2090011 (Source: Ophthalmic Genetics)
Source: Ophthalmic Genetics - November 25, 2022 Category: Opthalmology Authors: Virginia Miraldi Utz Jared J Ebert Diana S Brightman Brittany N Simpson Stefanie Benoit Robert A Sisk Source Type: research