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A Bayesian Model Based on Link Distribution Features for Multitarget Passive Localization in Visible Light Sensing

IEEE Sensors Journal 2025年第11期25卷 20037-20050页

作者： Zhang, Shuai Zhang, Liyi Liu, Kaihua Wang, Ya Tianjin University of Commerce School of Information Engineering Tianjin300134 China Tianjin University School of Microelectronics Tianjin300072 China Tianjin Renai College Information Engineering Department Tianjin301636 China Texas A&M University J. Mike Walker '66 Department of Mechanical Engineering The Department of Electrical and Computer Engineering Department of Biomedical Engineering College StationTX77843 United States

Passive localization using visible light (VL) sensing has been considered as a promising solution for indoor human detection. A major challenge is to avoid false target positioning in multitarget positioning scenarios. Besides, a reasonable probable target area model is also critical to the accuracy of positioning and counting targets. In this article, a novel passive localization scheme is proposed to locate multiple targets. This scheme introduces a rectangular probable target area model, which is used to calculate a rectangular area containing the potential location of the target to be located. Compared with existing models, it is more suitable for positioning scenarios under low-density deployment of sensing nodes. Furthermore, we present an improved successive cancellation (SC) algorithm to excluding false target localization. To determine the authenticity of targets by the SC algorithm, a Bayesian model is introduced to optimize the SC algorithm according to the multidimensional shadowed link information of candidate targets. Numerous simulation results show that the proposed multitarget passive localization scheme can improve the problem of false target localization in multitarget localization scenarios. And it also can achieve outstanding performance in localization accuracy. © 2025 IEEE.

关键词： Sensors Location awareness Transmitters Light emitting diodes Accuracy Bayes methods Vectors Receivers RF signals Time measurement

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Impact of Artificial Compressibility on the Numerical Solution of Incompressible Nanofluid Flow

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Computers, Materials & Continua 2023年第3期74卷 5123-5139页

作者： Tohid Adibi Shams Forruque Ahmed Seyed Esmail Razavi Omid Adibi Irfan Anjum Badruddin Syed Javed Department of Mechanical Engineering University of BonabBonabIran Science and Math Program Asian University for WomenChattogram4000Bangladesh School of Mechanical Engineering University of TabrizTabrizIran Energy Management Group Energy and Environment Research CenterNiroo Research InstituteTehranIran Mechanical Engineering Department College of EngineeringKing Khalid UniversityAbha61421Saudi Arabia

The numerical solution of compressible flows has become more prevalent than that of incompressible *** the help of the artificial compressibility approach,incompressible flows can be solved numerically using the same methods as compressible *** artificial compressibility scheme is thus widely used to numerically solve incompressible Navier-Stokes *** numerical method highly depends on its accuracy and speed of *** the artificial compressibility approach is utilized in several numerical simulations,the effect of the compressibility factor on the accuracy of results and convergence speed has not been investigated for nanofluid flows in previous ***,this paper assesses the effect of this factor on the convergence speed and accuracy of results for various types of *** improve the stability and convergence speed of time discretizations,the fifth-order Runge-Kutta method is applied.A computer program has been written in FORTRAN to solve the discretized equations in different Reynolds and Grashof numbers for various *** results demonstrate that the artificial compressibility factor has a noticeable effect on the accuracy and convergence rate of the *** optimum artificial compressibility is found to be between 1 and *** findings can be utilized to enhance the performance of commercial numerical simulation tools,including ANSYS and COMSOL.

关键词： Navier-Stokes equations incompressible flow artificial compressibility convergence rate convection flow

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Role of pericytes in regulating penile angiogenesis and nerve regeneration

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Asian Journal of Andrology 2025年第1期27卷 13-19页

作者： Guo Nan Yin Ji-Kan Ryu National Research Center for Sexual Medicine and Department of Urology Inha University School of MedicineIncheon 22332Korea Program in Biomedical Scienceand Engineering Inha UniversityIncheon 22212Korea

Pericytes are multifunctional mural cells that surround the abluminal wall of endothelial cells and are associated with vascular development,vascular permeability,and ***,pericytes demonstrate stem cell-like properties and contribute to neuroinflammatory *** have been extensively studied in the central nervous ***,specific mechanisms underlying its involvement in various physiological and pathological conditions,especially in erectile dysfunction(ED),remain poorly *** in in vitro and in vitro techniques,such as single-cell RNA sequencing,are expanding our understanding of *** studies have shown that pericyte dysfunction is considered an important factor in the pathogenesis of vascular and neurological ***,this study aims to analyze the specific role of pericytes in ED,focusing on diabetic and neurogenic *** article provides a comprehensive review of research findings on PubMed from 2000 to 2023,concerning pericyte dysfunction in the process of ED,offering valuable insights,and suggesting directions for further research.

关键词： angiogenesis blood-brain barrier erectile dysfunction nerve regeneration pericyte stem cell

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ANALYTICAL POSITION CONTROL SYSTEM OF A LINEAR HYDRAULIC ACTUATOR USED IN AIRCRAFT APPLICATIONS

International Journal of Mechatronics and Applied Mechanics

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International Journal of Mechatronics and Applied Mechanics 2023年第13期2023卷 209-218页

作者： Ali, Hasan H. Al-Bakri, Fawaz F. Khafaji, Salwan Obaid Waheed Directorate of Studies Planning and Follow-up Ministry of Higher Education and Scientific Research Baghdad Iraq University of Babylon College of Engineering Biomedical Engineering Department Babylon Iraq University of Babylon College of Engineering Mechanical Engineering Department Babylon Iraq

This paper proposes a novel control technique for motion control of a linear hydraulic actuator, in which actuator reference position and velocity profiles are generated analytically. The proposed algorithm parameterizes an eight-term exponential function based on initial, middle, and final boundary conditions. Nominal and off-nominal disturbance forces applied against the actuator are completely included to shape the desired system reference. This new scheme can create the reference pump rotational speed required to accurately control the presented system with no closed-loop commands and with excellent performance characteristics. Moreover, unlike the traditional hydraulic actuator control algorithms, the presented methodology is able to successfully respond to a wide range of disturbance forces while satisfying steady state conditions. The results showed that, the proposed controller steers the system to the steady state desired value within about 0.1 second only and with zero percent overshoot in terms of the reference input and about 2 percent for the disturbance input. Numerical results using the Monte-Carlo simulation method confirmed the effectiveness and the robustness of the new algorithm despite wide range of disturbance forces. © 2023, Cefin Publishing House. All rights reserved.

关键词： Numerical methods

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Liquid film thickness model formed by atomized droplets during sustainable cryogenic air MQL grinding

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Frontiers of mechanical engineering 2025年第1期20卷 45-68页

作者： Mingzheng LIU Changhe LI Qinglong AN Yanbin ZHANG Min YANG Xin CUI Teng GAO Yusuf Suleiman DAMBATTA Runze LI Key Laboratory of Industrial Fluid Energy Conservation and Pollution Control(Ministry of Education) Qingdao University of TechnologyQingdao 266520China Qingdao Jimo Qingli Intelligent Manufacturing Industry Research Institute Qingdao 266201China School of Mechanical Engineering Dalian University of TechnologyDalian 116081China Mechanical Engineering Department Ahmadu Bello UniversityZaria 810106Nigeria School of Engineering Department of Biomedical EngineeringMassachusetts Institute of TechnologyBoston 02139USA

Surface thermal damage in a difficult-to-process metal precision grinding workpiece has emerged as a technical bottleneck restricting machining *** an alternative to traditional pouring cooling,a green clean minimum-quantity lubrication technology still has defects,such as insufficient heat *** use of cryogenic air instead of normal temperature air,that is,the supply of low-temperature energized lubricant,can effectively improve oil film heat transfer and lubrication performance in a grinding *** the premise of ensuring the effective flow of lubricating oil in a grinding zone,the thickness of a liquid film in the wedge zone of a grinding wheel or workpiece is the key factor for determining its ***,the dynamic mechanism of droplet formation and distribution of liquid film thickness are still ***,the mechanism by which nozzle orientation influences the effective region of a liquid film was analyzed,and the range of nozzle inclination that helps to atomize droplets and enables them to enter the grinding zone was ***,the dynamic mechanism of atomized droplet film formation was analyzed,and the influence of normal and tangential momentum sources generated by gas impingement perturbation flow and droplet impingement steady flow on the driving effect of liquid film flow was *** thickness distribution model of a liquid film in the impact zone of gas–liquid two-phase flow under different cryogenic air temperatures was *** model results under different working conditions were obtained by numerical analysis,and validation experiments were carried *** show that the measured values agree with the theoretical *** 0.4 MPa air pressure,the thickness of the liquid film in the impact zone of the atomized droplets increases with decreasing cryogenic air ***−10 and−50°C,the thickness of the liquid film is 0.92 and 1.26 mm,***,on the basis of the surface topograph

关键词： sustainable grinding cryogenic cooling minimum quantity lubrication CAMQL liquid film thickness formation mechanism

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Application of Machine Learning for Classification of Systemic Sclerosis Based on Optical Coherence Elastography and Angiography Data 12

Application of Machine Learning for Classification of System...

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Optical Elastography and Tissue Biomechanics XII 2025

作者： Nikitin, P.V. Chawla, H.S. Nair, A.G. Singh, M. Aglyamov, S.R. Larin, K.V. Department of Biomedical Engineering University of Houston HoustonTX United States Department of Mechanical and Aerospace Engineering University of Houston HoustonTX United States

ISBN: (纸本)9781510683907

This study explores the integration of biomechanical and vascular data from optical coherence elastography (OCE) and optical coherence tomography angiography (OCTA) with machine learning to classify systemic sclerosis-related changes in a preclinical mouse model. Mice were divided into four experimental groups, including untreated controls and those treated with bleomycin, an ALK5 selective inhibitor, or a combination of both. OCE data estimates tissue stiffness based on elastic wave velocity, while OCTA data quantified vascular parameters, such as vessel lumen width. Machine learning algorithms, including Bagged Trees, Random Forest, and Support Vector Machines, were evaluated to classify samples into the four groups. The Bagged Trees model demonstrated the highest accuracy (80%), achieving a macro-AUC of 0.95 and significant improvements in precision-recall performance after hyperparameter tuning. Feature selection experiments highlighted the critical role of combining biomechanical and vascular data, with reduced feature sets yielding slightly diminished performance. PCA-based dimensionality reduction proved less effective, leading to performance declines across models. These findings underscore the feasibility of leveraging machine learning with OCE and OCTA data to enhance disease classification. The optimized Bagged Trees model emerged as the most robust approach, providing a framework for future applications in high-dimensional biomedical data analysis. This study demonstrates a novel integration of advanced imaging modalities and machine learning, paving the way for improved diagnostics and therapeutic monitoring in systemic sclerosis. © 2025 SPIE.

关键词： Optical coherence tomography

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The impact of temperature, pH, and numerical aperture on the Brillouin frequency shift 12

The impact of temperature, pH, and numerical aperture on the...

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Optical Elastography and Tissue Biomechanics XII 2025

作者： Fard, Sajedeh Saeidi Dehshiri, Mohammad Singh, Manmohan Schill, Alexander W. Aglyamov, Salavat R. Larin, Kirill V. Department of Biomedical Engineering University of Houston HoustonTX United States Department of Mechanical and Aerospace Engineering University of Houston HoustonTX United States

ISBN: (纸本)9781510683907

Significant progress has been made toward understanding and characterizing the mechanical properties of cells and tissues. Among the available techniques for assessing cellular biomechanics, Brillouin microscopy has emerged as a powerful, label-free, and non-destructive method for mechanical imaging. Brillouin microscopy overcomes many of the intrinsic limitations of other methods, such as requiring direct contact or lacking resolution. Regardless of the advances in Brillouin microscopy, this technique carries some considerations that should be acknowledged but are assumed to be negligible during imaging. One of the open questions regarding Brillouin data interpretation is the impact of environmental factors such as pH and temperature on the Brillouin frequency shift. Considering the vitality of these two parameters in biomedicine, e.g., cell culture, and the wide application of Brillouin microscopy in cell biology, the impact of pH and temperature on the Brillouin frequency shift should be more carefully studied. Another crucial element is the axial resolution of Brillouin microscopy, which can affect the scale of measurements in heterogeneous tissues. In this study, we have investigated how environmental factors such as pH and temperature, which vary in cells and tissues, and numerical aperture (NA) impact Brillouin measurements. The results show that there is a positive correlation between Brillouin frequency shift and temperature and a negative correlation between Brillouin frequency shift and pH. Furthermore, the results show that increasing NA resulted in a narrower point spread function (PSF) and finer axial mechanical resolution. © 2025 SPIE.

关键词： Tissue

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Performance Evaluation of Cryogenic Cooling effect in a Solar-powered Peltier-type Drug Storage Device for remote application

Performance Evaluation of Cryogenic Cooling effect in a Sola...

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2024 International Conference on Science, engineering and Business for Driving Sustainable Development Goals, SEB4SDG 2024

作者： Ige, Ebenezer Olubunmi Jacob, David Ikedi Babalola, Simeon Ayodele Ajayi, Oluwaseun Kayode Oyejide, Ayodele James Rochester Institute of Technology Department of Mechanical Engineering NY United States Afe Babalola University Department of Biomedical Engineering Ado-Ekiti Nigeria Obafemi Awolowo University Department of Mechanical Engineering Ile-Ife Nigeria

ISBN: (纸本)9798350358155

In many parts of developing nations, the preservation of vaccines is a difficult task. Since solar energy is readily available in sub-Saharan Africa, harvesting solar radiation to drive a thermoelectric device to provide the requisite cooling effect can deliver the needed means of preservation. In this report, parametric analysis of selected performance variables was investigated on a fabricated Peltier device using a system identification approach. A preliminary experiment to check the excitation of the system was conducted for 8 hours. The system was then excited to obtain different datasets for model development and validation. Parametric estimates of different linear system identification structures were computed. Measured outputs were compared with simulated outputs, and the equation for the best fit was presented. The observed system dynamics performance was estimated at approximately 76% cooling effect. The model Peltier device presented here could improve the preservation of blood, serum, and vaccine potency in clinics located in remote settlements where access to electricity is limited. © 2024 IEEE.

关键词： Vaccines

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Visualizing hypoxic modulation of beta cell secretions via a sensor augmented oxygen gradient

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Microsystems & Nanoengineering 2023年第1期9卷 191-202页

作者： Kai Duan Mengyang Zhou Yong Wang Jose Oberholzer Joe F.Lo Department of Mechanical Engineering Bioengineering ProgramUniversity of Michigan at DearbornDearbornMI48128USA Department of Surgery/Transplant University of VirginiaCharlottesvilleVA22908USA

One distinct advantage of microfluidic-based cell assays is their scalability for multiple concentrations or *** scaling can be extremely powerful when combining multiple parameters and ***,in situ stimulation and detection eliminates variability between individual ***,conventional microfluidics must combat diffusion,which limits the spatial distance and time for molecules traveling through ***,we leveraged a multilayered microfluidic approach to integrate a novel oxygen gradient(0–20%)with an enhanced hydrogel sensor to study pancreatic beta *** enabled our microfluidics to achieve spatiotemporal detection that is difficult to achieve with traditional *** this device,we demonstrated the in situ detection of calcium,insulin,and ATP(adenosine triphosphate)in response to glucose and oxygen ***,insulin was quantified at levels as low as 25 pg/mL using our imaging ***,by analyzing the spatial detection data dynamically over time,we uncovered a new relationship between oxygen and beta cell *** observed an optimum oxygen level between 10 and 12%,which is neither hypoxic nor normoxic in the conventional cell culture *** results provide evidence to support the current islet oscillator *** future applications,this spatial microfluidic technique can be adapted for discrete protein detection in a robust platform to study numerous oxygen-dependent tissue dysfunctions.

关键词： hypoxic stimulation gradient

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Recycling of Magnesium Alloy Using the Gravity-Driven Multiple-Effect Thermal System (G-METS)

Recycling of Magnesium Alloy Using the Gravity-Driven Multip...

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Magnesium Technology Symposium held at the TMS Annual Meeting and Exhibition, 2024

作者： Mc Arthur Sehar, Daniel Telgerafchi, Armaghan Ehsani Iurkovskyi, Artem Opoku, Emmanuel Powell, Adam Materials Science and Engineering Program Department of Mechanical Engineering Worcester Polytechnic Institute WorcesterMA United States Department of Mechanical Engineering Worcester Polytechnic Institute WorcesterMA United States

ISBN: (纸本)9783031502392

MagnesiumMagnesium metal has been significantly used in commercial applications from automobiles to aluminum alloys to defense weaponry. The surge in structural usage of magnesium over the past years has been due to high strength and excellent stiffness-to-weight ratio. RecyclingRecycling magnesium scrap is a crucial aspect of the sustainability of the economy and environmental welfare. G-METS is an advanced distillationDistillation system used in the conversion of low-grade magnesium scrap into high-purityHigh-purity magnesium metal. This multiple-effect system uses the weight of magnesiumMagnesium as a compressor, to build pressure differences between each effect of the condenser-evaporator, modifying boiling points, and enabling transfer of vaporization enthalpy. This system is exceptionally efficient compared to the energy-intensive conventional distillationDistillation technique. This study compares experiments and models of one- and two-effect distillers. © The Minerals, Metals & Materials Society 2024.

关键词： Magnesium alloys

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