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Inertial sensors technologies for navigation applications:state of the art and future trends

Satellite Navigation 2020年第1期1卷 9-29页

作者： Naser El-Sheimy Ahmed youssef Mobile Multi-sensor Systems Research Team Department of Geomatics EngineeringUniversity of Calgary2500 University Drive N.WCalgaryAB T2N 1N4Canada

Inertial navigation represents a unique method of navigation,in which there is no dependency on external sources of *** opposed to other position fixing navigation techniques,inertial navigation performs the navigation in a relative sense with respect to the initial navigation state of the moving ***,inertial navigation systems are not prone to jamming,or *** navigation systems have developed vastly,from their occurrence in the 1940s up to *** accuracy of the inertial sensors has improved over time,making inertial sensors sufficient in terms of size,weight,cost,and accuracy for navigation and guidance *** the past few years,inertial sensors have developed from being purely mechanical into incorporating various technologies and taking advantage of numerous physical phenomena,from which the dynamic forces exerted on a moving body could be computed ***,the evolution of inertial navigation scheme involved the evolution from stable-platform inertial navigation system,which were mechanically complicated,to computationally demanding strap-down inertial navigation *** sensory technologies have provided highly accurate inertial sensors,at smaller ***,the vibratory inertial navigation technologies enabled the production of Micro-electro-machined inertial sensors that are extremely low-cost,and offer extremely low size,weight and power consumption,making them suitable for a wide range of day-to-day navigation ***,advanced inertial sensor technologies have been introduced to the industry such as nuclear magnetic resonance technology,coldatom technology,and the reintroduction of fluid-based inertial *** another note,inertial sensor errors constitute a huge research aspect in which it is intended for inertial sensors to reach level in which they could operate for substantially long operation times in the absence of updates from aiding sensors,which would be a hug

关键词： Gyroscopes Accelerometers Optical inertial sensors Micro-electro-machined Fluid-based inertial sensors Stochastic modeling

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Landslide susceptibility mapping using machine learning algorithms and comparison of their performance at Abha Basin,Asir Region,Saudi Arabia

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Geoscience Frontiers 2021年第2期12卷 639-655页

作者： Ahmed Mohamed youssef Hamid Reza Pourghasemi Geology Department Faculty of ScienceSohag UniversityEgypt Geological Hazards Department Applied Geology SectorSaudi Geological SurveyP.O.Box 54141Jeddah21514Saudi Arabia Department of Natural Resources and Environmental Engineering College of AgricultureShiraz UniversityShirazIran

The current study aimed at evaluating the capabilities of seven advanced machine learning techniques(MLTs),including,Support Vector Machine(SVM),Random Forest(RF),Multivariate Adaptive Regression Spline(MARS),Artificial Neural Network(ANN),Quadratic Discriminant Analysis(QDA),Linear Discriminant Analysis(LDA),and Naive Bayes(NB),for landslide susceptibility modeling and comparison of their *** machine learning algorithms with spatial data types for landslide susceptibility mapping is a vitally important *** study was carried out using GIS and R open source software at Abha Basin,Asir Region,Saudi ***,a total of 243 landslide locations were identified at Abha Basin to prepare the landslide inventory map using different data *** the landslide areas were randomly separated into two groups with a ratio of 70%for training and 30%for validating *** landslide-variables were generated for landslide susceptibility modeling,which include altitude,lithology,distance to faults,normalized difference vegetation index(NDVI),landuse/landcover(LULC),distance to roads,slope angle,distance to streams,profile curvature,plan curvature,slope length(LS),and *** area under curve(AUC-ROC)approach has been applied to evaluate,validate,and compare the MLTs *** results indicated that AUC values for seven MLTs range from 89.0%for QDA to 95.1%for *** findings showed that the RF(AUC=95.1%)and LDA(AUC=941.7%)have produced the best performances in comparison to other *** outcome of this study and the landslide susceptibility maps would be useful for environmental protection.

关键词： Landslide susceptibility Machine learning algorithms Variables importance Saudi Arabia

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Preserving Personalized Location Privacy in Ride-Hailing Service

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Tsinghua Science and Technology 2020年第6期25卷 743-757页

作者： youssef Khazbak Jingyao Fan Sencun Zhu Guohong Cao the Department of Computer Science and Engineering The Pennsylvania State UniversityUniversity ParkPhiladelphiaPA 16802USA Amazon Corp. SeattleWA 98121USA

Ride-hailing service has become a popular means of transportation due to its convenience and low ***,it also raises privacy *** riders’mobility information including the pick-up and drop-off location is tracked,the service provider can infer sensitive information about the riders such as where they live and *** address these concerns,we propose location privacy preserving techniques that efficiently match riders and drivers while preserving riders’location *** first propose a baseline solution that allows a rider to select the driver who is the closest to his pick-up ***,with some side information,the service provider can launch location inference *** overcome these attacks,we propose an enhanced scheme that allows a rider to specify his privacy *** techniques are designed to preserve rider’s personalized privacy with limited loss of matching *** trace-driven simulations,we compare our enhanced privacy preserving solution to existing *** results show that our solution provides much better ride matching results that are close to the optimal solution,while preserving personalized location privacy for riders.

关键词： ride-hailing location privacy privacy preserving Voronoi diagram

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A Stochastic Collocation Approach to Bayesian Inference in Inverse Problems

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Communications in Computational Physics 2009年第9期6卷 826-847页

作者： youssef Marzouk Dongbin Xiu Department of Aeronautics&Astronautics Massachusetts Institute of TechnologyCambridgeMA 02139USA Department of Mathematics Purdue UniversityWest LafayetteIN 47907USA

We present an efficient numerical strategy for the Bayesian solution of inverse *** collocation methods,based on generalized polynomial chaos(gPC),are used to construct a polynomial approximation of the forward solution over the support of the prior *** approximation then defines a surrogate posterior probability density that can be evaluated repeatedly at minimal computational *** ability to simulate a large number of samples from the posterior distribution results in very accurate estimates of the inverse solution and its associated *** with high accuracy of the gPC-based forward solver,the new algorithm can provide great efficiency in practical applications.A rigorous error analysis of the algorithm is conducted,where we establish convergence of the approximate posterior to the true posterior and obtain an estimate of the convergence *** is proved that fast(exponential)convergence of the gPC forward solution yields similarly fast(exponential)convergence of the *** numerical strategy and the predicted convergence rates are then demonstrated on nonlinear inverse problems of varying smoothness and dimension.

关键词： Inverse problems Bayesian inference stochastic collocation generalized polynomial chaos uncertainty quantification

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A Sequential Adaptive Method for Enhancing DOA Tracking Performance

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Transactions of Nanjing University of Aeronautics and Astronautics 2016年第6期33卷 -页

作者： youssef Fayad Wang Caiyun Cao Qunsheng College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics College of Astronautics Nanjing University of Aeronautics and Astronautics

A sequential processing is presented aiming at optimizing the direction of arrival(DOA)tracking ***,current positions and Doppler frequency are estimated and a mathematical model is derived in order to clarify the effect of Doppler frequency on the *** Doppler effect is employed within subspace concept in order to refine the estimation of the target ***,a renewed weight factor that depends on target maneuver is employed in order to realize more accurate association and smoothing *** results show that the presented method has high accuracy in DOA tracking.

关键词： tracking maneuver direction of arrival(DOA) Doppler effect

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Assessment of forest dieback on the Moroccan Central Plateau using spectral vegetation indices

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Journal of Forestry Research 2023年第3期34卷 793-808页

作者： youssef Dallahi Amal Boujraf Modeste Meliho Collins Ashianga Orlando Laboratory of Microbial Biotechnologies Agrosciences and Environment(BioMAgE)Faculty of Sciences SemlaliaCadi Ayyad UniversityMarrakechMorocco Laboratoire des Productions Végétale Animales et Agro-industrieEquipe de BotaniqueBiotechnologie et Protection des PlantesFacultédes SciencesUniversitéIbn TofailKenitraMorocco Sociétés TerritoiresHistoires et PatrimoinesFacultédes Lettres et des Sciences HumainesUniversitéMohammed VRabatMorocco Rabat Morocco

Cork oak forests in Morocco are rich in resources and services thanks to their great biological diversity,playing an important ecological and socioeconomic *** degradation of the forests has been accentuated in recent years by signifi cant human pressure and eff ects of climate change;hence,the health of the stands needs to be *** this study,the Google Engine Earth platform was leveraged to extract the normalized diff erence vegetation index(NDVI)and soil-adjusted vegetation index,from Landsat 8 OLI/TIRS satellite images between 2015 and 2017 to assess the health of the Sibara Forest in *** results highlight the importance of interannual variations in NDVI in forest monitoring;the variations had a signifi cantly high relationship(p<0.001)with dieback *** was positively and negatively correlated with mean annual precipitation and mean annual temperature with respective coeffi cients of 0.49 and−0.67,highlighting its ability to predict phenotypic changes in forest *** interannual variation in NDVI between 2016 and 2017 seemed to confi rm fi eld observations of cork oak dieback in 2018,with the largest decreases in NDVI(up to−38%)in December in the most-aff ected *** of the infl uence of ecological factors on dieback highlighted the role of substrate as a driver of dieback,with the most severely aff ected plots characterized by granite-granodiorite substrates.

关键词： Forest health monitoring Remote sensing Dieback Vegetation indices Sibara forest

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RESPONSE OF MICROPOLAR THERMOELASTIC SOLID WITH VOIDS DUE TO VARIOUS SOURCES UNDER GREEN NAGHDI THEORY

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Acta Mechanica Solida Sinica 2012年第2期25卷 197-209页

作者： Mohamed Ibrahim Ahmed Othman Sarhan youssef Atwa Department of Mathematics Faculty of ScienceZagazig UniversityP.O.Box 44519ZagazigEgypt Higher Institute of Engineer Dept.of Eng.Math.and PhysicsShorouk AcademyEgypt Faculty of Science Department of mathematicsShaqra UniversityAL-QuwaiyahSaudi Arabia

Green-Naghdi （G-N） theory of thermoelasticity is employed to study the deformation of micropolar thermoelastic solid with voids considering the influence of various sources acting on the plane surface. The normal mode analysis is used to obtain the analytical expressions of the displacement components, force stress, coupled stress, variation of volume fraction field and temperature distribution. The computed results are presented graphically when the volume source is applied. Comparisons of type II and type III with and without micropolarity effect are made with the results predicted in the context of （G-N） theory.

关键词： micropolar thermoelastic solid volume fraction coupled stress energy dissipation,voids

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State-space approach to vibration of gold nano-beam induced by ramp type heating

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Nano-Micro Letters 2010年第3期2卷 139-147页

作者： Hamdy M.youssef Khaled A.Elsibai Mathematical Department-Faculty of Education-Alexandria University-Egypt Mathematics Department Faculty of ScienceMansoura University

In the nanoscale beam,two effects become *** is the non-Fourier effect in heat conduction and the other is the coupling effect between temperature and strain *** the present study,a generalized solution for the generalized thermoelastic vibration of gold nano-beam resonator induced by ramp type heating is *** solution takes into account the above two ***-space and Laplace transform methods are used to determine the lateral vibration,the temperature,the displacement,the stress and the strain energy of the *** effects of the relaxation time and the ramping time parameters have been studied.

关键词： Thermoelasticity Euler-Bernoulli equation Gold nano-beam Ramp type heating

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Paleoecology of Benthic Foraminifera in Coral Reefs Recorded in the Jurassic Tuwaiq Mountain Formation of the Khashm Al-Qaddiyah Area, Central Saudi Arabia

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Journal of Earth Science 2015年第2期26卷 224-235页

作者： Mohamed youssef Abdelbaset S.El-Sorogy Department of Geology and Geophysics College of Science King Saud University Department of Geology Faculty of Science South Valley University Department of Geology Faculty of Science Zagazig University

Thirty three benthic foraminiferal species belong to 23 genera and 16 families have been recorded from the coral reefs of the Callovian Tuwaiq Formation, Khashm AI-Qaddiyah area, Central Saudi Arabia. Three species： Astacolus qaddiyahensis, Nodosaria riyadhensis, Siderolites jurassica are believed to be new. Nearly all identified foraminifera are of Atlantie-Miditeranean affinity. The foraminiferal assemblage recorded in the present work is mixed of open marine, moderately deep marine conditions associations and shallow to deep lagoon. The reefal part of upper Twiaq Formation may have been deposited in shallow water of lower to middle shelf depth （20-50 m） as indicated by abundant corals and benthic foraminifera. The coral fauna and bearing benthic foraminifera indicated moderate water energy.

关键词： coral reef benthic foraminifera Jurassic Tuwaiq Formation Saudi Arabia.

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Hilger-type impulsive differential inequality and its application to impulsive synchronization of delayed complex networks on time scales

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Science China(Information Sciences) 2018年第7期61卷 244-246页

作者： Zhenkun HUANG Jinde CAO youssef N.RAFFOUL School of Science Jimei University School of Mathematics Southeast University Department of Mathematics University of Dayton

The synchronization and synchronous control of complex networks[1]have rich dynamics and are lately receiving much needed attention[2–6].Owing to the major role that impulsive control plays[6]in investigating synchronization problems and impulsive synchronization in dynamical networks,researchers have devoted more time researching them[2–6].However,most of the existing literature concerning impulsive effects are confined to continuous or discrete time domains[2,6].

关键词： Hilger-type impulsive differential inequality and its application to impulsive synchronization of delayed complex networks on time scales

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