A5061387884- Optical Wireless Communication Technologies
- UAV Applications and Optimization
- Image Enhancement Techniques
- Advanced Optical Sensing Technologies
- Millimeter-Wave Propagation and Modeling
- Energy Harvesting in Wireless Networks
- Advanced Measurement and Metrology Techniques
- Radio Wave Propagation Studies
- Advanced Surface Polishing Techniques
- Ocular Oncology and Treatments
- Advanced machining processes and optimization
- solar cell performance optimization
- Text and Document Classification Technologies
- Molecular Communication and Nanonetworks
- Photocathodes and Microchannel Plates
- Optical Imaging and Spectroscopy Techniques
- Skin Protection and Aging
- Advanced Optical Network Technologies
- Photodynamic Therapy Research Studies
- Web Data Mining and Analysis
- Intermetallics and Advanced Alloy Properties
- Advanced Wireless Communication Technologies
- Photoacoustic and Ultrasonic Imaging
- Diabetes Treatment and Management
- Health, Environment, Cognitive Aging
Tsinghua University
2017-2025
Chinese Center For Disease Control and Prevention
2022
Zhejiang Hospital
2022
Shenzhen Institutes of Advanced Technology
2021
University Town of Shenzhen
2019-2020
Tsinghua–Berkeley Shenzhen Institute
2020
South China University of Technology
2016-2019
University of Science and Technology Beijing
2018
Anhui University of Technology
2013-2016
Harvard University
1956
Metformin, the first-line therapy for type 2 diabetes (T2D), decreases hepatic glucose production and reduces fasting plasma levels. Dorzagliatin, a dual-acting orally bioavailable glucokinase activator targeting both pancreas liver glucokinase, postprandial in patients with T2D. In this randomized, double-blind, placebo-controlled phase 3 trial, efficacy safety of dorzagliatin as an add-on to metformin were assessed T2D who had inadequate glycemic control using alone. Eligible (n = 767)...
The total scattering cross section in the short wavelength limit is considered this paper. problems treated include diffraction of a plane electromagnetic wave by conducting cylinder (two possible polarizations) or sphere, acoustic rigid and quantum-mechanical an impenetrable sphere. first correction term to geometric optics result computed. In each case, proportional (ka)−2/3. constant proportionality depends on specific geometry.
The study on short-range ultraviolet communication (UVC) channel modeling is often based prolate-spheroidal coordinate system in the previous studies. In this letter, we propose a single scattering coplanar model spherical system, where transmitter beam and receiver field of view (FOV) can point arbitrarily under limitation that sum transceiver elevation angles half their own FOV less than 180°, are above ground. We utilize number intersections between special ray cone conical surface to...
Unmanned aerial vehicle (UAV) swarm communication has received increasing attention thanks to its intriguing advantages, such as low costs, high mobility, and deployment convenience. However, this technology is also facing certain new challenges, for example, RF spectrum scarcity, interference, network connectivity. To end, ultraviolet (UV) introduced in article tackle these problems due distinctive benefits, license-free operation, immunity electromagnetic the ability of non-line-of-sight...
By considering both scattering and reflection events as collision-induced (CIEs), an analytical path loss model of reflection-assisted non-line-of-sight (NLOS) ultraviolet communications (UVC) is proposed with single CIE incorporated, which refers to the single-collision-induced (SCI) model. More specifically, expressions received optical energy resulting from single-scatter single-reflection in NLOS UVC are respectively derived. Then, terms those two expressions, expression SCI obtained....
A theoretical channel impulse response (CIR) model of short-range non-line-of-sight (NLOS) ultraviolet communications (UVC) in noncoplanar geometry under the single-scatter condition is proposed. Simulation results obtained from widely accepted Monte-Carlo (MC)-based NLOS UVC are provided to verify corresponding proposed CIR model. Additionally, an outdoor experiment with a light-emitting diode (LED) as light source first designed measure step and further validate By varying different...
The single-scattering model for short-range ultraviolet (UV) communication is often replaced by an approximate due to its simplified calculation. However, there are certain errors associated with the existing models. To reduce errors, a spherical crown (SC) in narrow beam case derived this letter, where we assume that differential volume thin layer of SC. Meanwhile, applicable conditions and error range SC provided. calculation results indicate models from -1.4 6.0 dB while those -0.2 0.4...
Light-emitting diodes (LEDs) are popularly used as light sources in non-line-of-sight (NLOS) ultraviolet communications (UVC). However, currently reported single-scatter path loss (PL) models of NLOS UVC links assume that the radiant intensity source is uniformly distributed within beam divergence angle, which cannot well characterize emission pattern LEDs. In this Letter, we propose a PL model for LED-based systems, and corresponding analytical expression derived by modeling LED Lambertian...
Considering high path loss (PL) of the non-line-of-sight (NLOS) ultraviolet communications (UVC) realized by atmospheric scattering effect light, we propose to use a reflective plane improve received optical power and further reduce PL. More specifically, channel model for NLOS UVC with not only but also reflection considered is proposed via Monte-Carlo (MC) photon-tracing method. Both events are called collision-induced (CIEs). The can obtain PL impulse response (CIR) performances system...
Background Previous studies revealed that maternal smoking exposure during pregnancy was an essential risk factor for offspring developing attention-deficit/hyperactivity disorder (ADHD). The impact of paternal 1 year before on ADHD is still unclear. Methods present study included 2,477 school-age children and their parents from the Shanghai Child Adolescent Health Cohort who had complete data diagnosis parents' information. A multivariate logistic regression model Firth's were used to...
The existing ultraviolet (UV) single scattering models do not incorporate the applicability of transceiver geometry, which makes them have certain errors even in short-range cases. To solve this issue, we propose a model Letter, is suitable for case where field view above ground. This meets requirements general UV communication. For tractable analysis, utilize number intersections between special rays on cone to classify communication scenarios. Calculation results show that when elevation...
Existing studies of ultraviolet (UV) communication channel models focus mainly on point-to-point scenarios. To analyze UV characteristics in omni-directional scenarios, we propose a multiple scattering model based the Monte Carlo method this Letter, where assume that receiver can be anywhere certain area and all receivers point to vertical axis transmitter. Meanwhile, validate proposed comparison existing simulation model. Simulation results demonstrate single is not applicable analysis due...
Radio frequency (RF) technology is widely adopted in indoor wireless communications due to its attractive benefits such as low cost and easy deployment. However, this also faces certain challenges spectrum scarcity security concerns. In article, ultraviolet (UV) communication introduced tackle these issues thanks distinctive benefits, for example, huge bandwidth without licensing, scattering reflection propagations, security, sterilization disinfection. Initially, a comprehensive comparison...
The performance of multipulse pulse-position modulation (MPPM) in non-line-of-sight (NLOS) ultraviolet communications (UVC) with output signals detectors following Poisson distribution and Poisson-triggered Gaussian (PTG) has been investigated. Specifically, the probabilities a given number incorrectly identified pulsed or empty slots an MPPM symbol have derived PTG distributed. Based on those probabilities, expressions symbol-error rate achievable data NLOS UVC systems further obtained....
In this Letter, a single scattering turbulence model in narrow beam case for ultraviolet (UV) communication is proposed based on the division of effective volume. This takes variation atmospheric scattering, absorption, and different paths into account. Meanwhile, applicable transceiver configurations are provided by analyzing path loss error caused assumption UV channel. Furthermore, we investigate effect probability density function arriving power both coplanar non-coplanar scenarios. The...
Existing studies of the ultraviolet (UV) channel mainly focus on non-line-of-sight (NLOS) scenarios, while line-of-sight (LOS) scenarios are generally neglected since obstacles sometimes block them. To fill this gap, a UV diffused-LOS model in presence an obstacle is proposed for first time, to best our knowledge. For easy interpretation, whole derivation combined with four typical positions obstacle. Moreover, applicability investigated via comparison classical Monte Carlo simulation model,...
Due to the high path loss of non-line-of-sight (NLOS) ultraviolet communications (UVC) channel, pulse modulation schemes, such as on-off keying (OOK) and M-ary pulse-position (PPM), photon-counting receivers are commonly adopted. Although PPM can be demodulated decoded without channel state information, its spectral efficiency is lower than OOK's. To improve in NLOS UVC, a power-domain multilayer-superposed transmission (MST) scheme with binary (BPPM) proposed this work. Based on scheme,...
Ultraviolet (UV) technology plays an important role in the fields of sterilization, disinfection, and short-range wireless optical communications. In this Letter, a theoretical model to determine UV radiation intensity (UVRI) on human skin is put forward based Monte Carlo method, where wavelength ranges from 200 300 nm. Meanwhile, UVRI evaluation algorithm provided reproduce simulation results. Furthermore, penetration depth epidermis investigated, which can be used assess whether causes...
The existing works on ultraviolet (UV) channel modeling primarily focus non-line-of-sight (NLoS) communication scenarios, where the UV transceiver does not need to be aligned and can communicate around obstacles. However, NLoS scenarios also face problems such as long delay spread severe path loss, consequently, these phenomena will exacerbated amount dimension of obstacles increase. To tackle problems, we investigate models for diffused line-of-sight (LoS) comprehensively. First, a...
Existing research on non-line-of-sight (NLoS) ultraviolet (UV) channel modeling mainly focuses scenarios where the signal propagation process is not affected by any obstacle and radiation intensity (RI) of light source uniformly distributed. To eliminate these restrictions, we propose a single-collision model for NLoS UV incorporating cuboid-shaped obstacle, RI modeled as Lambertian distribution. For easy interpretation, categorize intersection circumstances between receiver field-of-view...
As transceiver elevation angles increase from small to large, existing ultraviolet (UV) non-line-of-sight (NLoS) models encounter two challenges: i) cannot estimate the channel characteristics of UV NLoS communication scenarios when there exists an obstacle in overlap volume between transmitter beam and receiver field-of-view (FoV), ii) evaluate path loss for wide FoV with simplified single-scattering models. To address these challenges, a scattering model incorporating was investigated,...
Existing studies on ultraviolet (UV) non-line-of-sight (NLoS) channel modeling primarily focus scenarios without any obstacle, which makes them unsuitable for small transceiver elevation angles in most cases. To address this issue, a UV NLoS model incorporating an obstacle was investigated paper, where the impacts of atmospheric scattering and reflection signals were both taken into account. validate proposed model, we compared it to related Monte-Carlo photon-tracing (MCPT) that had been...